CN1693755A - Heating furnace with regenerative burners and method of operating heating furnace - Google Patents
Heating furnace with regenerative burners and method of operating heating furnace Download PDFInfo
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- CN1693755A CN1693755A CNA2005100789386A CN200510078938A CN1693755A CN 1693755 A CN1693755 A CN 1693755A CN A2005100789386 A CNA2005100789386 A CN A2005100789386A CN 200510078938 A CN200510078938 A CN 200510078938A CN 1693755 A CN1693755 A CN 1693755A
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Abstract
The invention relates to a method for controlling a furnace pressure. A thermal transducer is arranged on the way for guiding the waste gas in the heating furnace out of the chimney channel. When the thermal transducer supplies the heating source of the heating furnace namely the air for the burning of a burner, in order to prevent the thermal transducer from being damaged by high temperature, the flow of the diluents air is adjusted according to the temperature of the waste gas at the inlet side of the thermal transducer and the burning load of the heating furnace to control the furnace pressure when supplying diluents air at the thermal transducer inlet side of the chimney channel.
Description
Technical field
This invention relates to the method for the furnace pressure of most suitably controlling heating furnace.This invention relates to the method that the atmosphere of heating furnace is controlled, particularly related to the oxygen concentration rising that suppresses in the atmosphere.This invention relate to the method for operating of heating furnace and heating furnace with heat-accumulating burner, particularly be related to the method for operating of the paired burner alternate combustion of advantageously carrying out heat-accumulating burner and in this operation the direct heating furnace of use.This invention relates to the assay method and the heating furnace of the atmosphere gas concentration in the heating furnace.
Background technology
The heating furnace of steel is to think that strand with the steel billet of cogging factory roughing and continuous casting is rolled into final products and is heated into that to be suitable for this rolling set point of temperature be that purpose is used again.This heating furnace is divided into batch-type heating furnace and continuous-type furnace substantially.Owing to have merits and demerits separately, select to use according to its purpose.Continuous-type furnace is suitable for production in enormous quantities in recent years, so steel plant use this heating furnace mostly.
Figure 1 shows that the typical example of the profile of continuous-type furnace.Generally the side of packing into from steel is made of preheating zone 1, heating tape 2 and soaking zone 3 successively.At least heating tape 2 and soaking zone 3 are heated to set point of temperature by burner 4 and are incubated.The steel 5 that import preheating zone 1 from the fire door 1a that packs into move on carry road 6, are heated to set point of temperature in soaking zone 3 then through heating tape 2, and the extraction fire door 3a of 3 outlet sides takes out of outside the stove from the soaking zone.The waste gas that burning produced by burner 4 is discharged to outside the stove from the flue 7 of the entrance side that is located at preheating zone 1.In addition, 7a is that heat exchanger and 7b that the waste gas sensible heat heat exchange with flue 7 becomes burner combustion to use with the sensible heat of air are the flue shutters that the control furnace pressure is used.
At this, continuous-type furnace must be heated to steel the temperature that is suitable for rolling process thereafter.If the temperature of the steel that continuous-type furnace heated is lower than the rolling suitable temperature lower limit of regulation, then can rolling operation and product quality bring harmful effect.In addition, need temperature if the temperature of the steel of extracting out from heating furnace is higher than, then the heat loss of continuous furnace is big, so in continuous-type furnace, it is important with the fuel of necessary minimum steel being heated to rolling suitable temperature.And, also require in heating furnace, to adjust heat time heating time, so that in turn supply with the steel that heat from heating furnace accordingly with the rolling cycle of rolling process.
In continuous-type furnace, the loss of the radiant energy of heat loss, particularly heating tape is big.By in inlet, outlet side configuration preheating zone and the soaking zone of heating tape,, suppress heat loss like this with being divided into 3 zones in the stove.
Pack into the steel of continuous-type furnace, have the strand that is cooled to normal temperature and continuous casting back directly direct sending be just different to the hot charging stove material of rolling process etc. in the temperature of heating furnace entrance side.Its heating-up temperature is that height is different, and the treating capacity of the steel that heat in heating furnace also changes.Must be according to the temperature in this all condition control heating furnace.The quantity combusted of increase and decrease burner is adjusted heating-up temperature.At this moment, because the variation of burner combustion amount, furnace pressure changes.
If furnace pressure is lower than stove external pressure, in then extraneous air is promptly packed fire door and extraction fire door intrusion stove into from the peristome of heating furnace.If air is invaded in the stove, then temperature reduces in the stove, so increase the quantity combusted of burner.Because of unit consumption of fuel increases, cost is risen.If air is invaded in the stove, then the oxygen concentration of furnace atmosphere rises, oxidation, nitrogenize or the decarburization etc. on the surfaces such as steel so promotion is packed in the stove.Its result causes that surface quality of steel reduces.
Therefore, must suitably control the interior pressure of heating furnace.About furnace pressure control, various motions have been proposed.For example, the spy opens clear 61-119987 communique and has disclosed such method, promptly according to waste gas generating capacity in the stove, the setting furnace pressure of heating furnace soaking zone is controlled to be malleation (being designated hereinafter simply as malleation) with respect to the stove external pressure, prevent from packing fire door and extract the fire door invading air out into.According to the method, the furnace pressure that with the landline in the stove is the upper area (hereinafter referred to as the top band) on boundary can be controlled to be malleation.But, under the little situation of the burning load of whole heating furnace, be that the furnace pressure pressure outer with respect to stove of the lower area (hereinafter referred to as the bottom band) on boundary is negative pressure (hereinafter referred to as negative pressure) with landline in the stove.Prevent that positively from the underclearance invading air of pack into fire door and extraction fire door be difficult.These fire doors be difficult to positively to prevent from the engagement of broach shape ground closed, be called as V shape (extrafork) peristome and enter air.The V shape peristome of so-called broach shape is 3C place shown in Figure 14.
In addition, the spy opens flat 9-209032 communique and has disclosed such method, i.e. the top of soaking zone, and the furnace pressure flashboard in the flue that passes through by the waste gas that is located at heating furnace according to the burning load amount of heating furnace, is controlled furnace pressure best.But, burning load amount hour, the air-flow of flue (draft) is bigger than the pressure loss that causes to the waste gas stream of flue in the stove.So-called air-flow is meant that heated gas produces buoyancy and becomes negative pressure in flue and stove.In this case, be difficult to utilize the furnace pressure flashboard to make and become malleation until the bottom band.Be difficult to positively prevent from fire door and the extraction fire door invading air of packing into.
The heat exchanger outlet side that Te Kaiping 7-316645 communique has disclosed at flue connects gas supplying tubing system, gases such as air is blown into the method for flue control furnace pressure.This method must newly be established air blast and various pipe arrangement and control system in order to control furnace pressure.There are cost of equipment height, the miscellaneous problem of its maintenance.And intricately is equipped with pipeline and sets up equipment around the heating furnace, so there is not configuration space, is difficult to newly establish control system.
Prevent in the air intrusion heating furnace this considers it is very important with the operation of heating furnace on product quality.For the technology that realizes this point has various motions.For example, open in the flat 11-172326 communique the spy and to have proposed such scheme, promptly extract a mouthful invading air out from heating furnace in order to prevent, from stove in heating burner branch be opened near extracting out mouthful a nozzle ejection imflammable gas, the burning by at this moment consumes the oxygen in the invading air.
But, must near extracting mouth out, establish special-purpose imflammable gas jetting nozzle, need the flower installation cost.In addition, be effectively for the position top invading air that is provided with from jetting nozzle, but little for the effect that below, position invading air is set from this jetting nozzle.Because the furnace pressure of below is a negative pressure, so can not avoid air here to invading.Particularly be difficult to positively prevent from V shape peristome invading air.
In recent years, on continuous-type furnace, its heating source adopts heat-accumulating burner, carries out the heat in the waste gas is used in again the operation of heating furnace preheating, that heat loss is few of the combustion air of burner.Fig. 2 A and Fig. 2 B are the examples of the structure of expression heat-accumulating burner.Shown in the example of Fig. 2 A and Fig. 2 B, heat-accumulating burner is by constituting with the lower part: a pair of burner 40a and the 40b that relatively dispose between the two side of the equal hot body 3 of heating furnace; Outside stove, combustion air imported each burner and the waste gas in the stove is imported the dual-purpose path 41a and the 41b of stove external application by each burner; In illustrated example, be provided in the heat storage 42a and the 42b at the burner side opening place of each path.The a pair of burner of this heat-accumulating burner is alternately burnt.For example, shown in Fig. 2 A, 41a supplies with burner 40a with combustion air from the dual-purpose path, meanwhile supply with fuel 43a, make burner 40a when burning, from sucking waste gas in stove with its burner 40b in opposite directions, this waste gas reclaims after the heat by heat storage 42b, import dual-purpose path 41b, be discharged to outside the stove.
Then, the burning running of conversion burner, and at this moment change the switching valve 44 of dual- purpose path 41a and 41b, change with being connected of the conduit of above-mentioned air and waste gas after, shown in Fig. 2 B, with combustion air from dual-purpose path 41b, when supplying with burner 40b by heat storage 42b, lateral dominance is used in the heat that heat storage 42b is reclaimed in the technical process shown in the prior figures 2A, the preheated burning air, and this air is supplied with on the limit, supply with fuel 43b simultaneously, make burner 40b burning.Simultaneously, from sucking waste gas in stove with its burner 40a in opposite directions, this waste gas reclaims by heat storage 42a after the heat, imports dual-purpose path 41a, and is discharged to outside the stove.
By for example carrying out the alternate combustion of burner shown in above Fig. 2 A and Fig. 2 B every tens of second repeatedly, can carry out the few furnace operation of heat loss.
At this, attraction to the waste gas of discharging from the burner in non-when burning, for example shown in Fig. 2 A and Fig. 2 B, end at the path 45 that attracts by heat storage 42a or 42b from burner 40a or 40b sets for example by the suction device 8 that attracts fan to constitute, drive this suction device 8, just attract the waste gas of discharging from burner.
But, in the operation of the heating furnace that uses above heat-accumulating burner, after beginning to carry out burner combustion to reach design temperature during and (or) atmosphere gas in the stove is controlled to be under the situation of the low-temperature region about 800 ℃, attract out and the temperature of waste gas by heat storage also reduces from burner.Its result, at the waste gas outlet side and connected above-mentioned path 45 places of heat storage, moisture and sulphur content contained in the waste gas condense.The liquid that produces because of condensing, be the waste gas outlet side that so-called condensed water often is trapped in heat storage.Under this state, the burning running of conversion burner and when becoming fired state, condensed water is sneaked into the result in the combustion air, the problem of bringing combustion flame temperature to descend.The reduction of the combustion flame temperature that causes because of condensed water reduces the thermal efficiency of heating furnace, and the situation that hinders the low temperature running is also arranged.
In addition, be provided with on the heating furnace of a plurality of heat-accumulating burners, it is longer to come out to import by the waste gas that heat storage becomes low temperature the path of suction device from burner.Often condensed water not only produces at the heat storage outlet side, also produces in above-mentioned path way.The condensed water that produces on this path can corrode the impeller of suction device.During contained solid-state part abrasive damage impeller, can develop into great accident in the condensed water.Therefore, now, the heating furnace with heat-accumulating burner is carried out continually the inspection of waste gas suction device.In addition, frequent increase of repairing required expense such as the impeller replacing of suction device also is a problem.
For above-mentioned variety of issue, open in the flat 10-30812 communique the spy and to have disclosed device shown in Figure 3 about condensed water.The waste gas that makes (for example the soaking zone 3) in the heating furnace is by in the bypass pipe 51 inflow exhaust gas pipe arrangement roads 50, and this bypass pipe is arranged with the path branch that discharges out of the furnace by burner 40a and waste gas pipe arrangement road 50.Having disclosed by such method just to make the temperature in the waste gas pipe arrangement road 50 remain on more than the dew point of waste gas.
But, for the temperature that makes the thickness of steel product direction is even, can not carry out the occasion of high load capacity burning etc. with producing equipment fault in the occasion of spending the long period to heat with lower temperature, must make burner combustion with extremely low load.In this case, that make that suction device (fan) is reduced to its attraction power for example is not 10% result who turns round, and tends to make the running instability of suction device.Can not stably obtain rotating flow with the whole blade of fan, produce the position that can not obtain rotating flow because of stall.So, not only be difficult to make the waste gas traffic attraction that sucks from burner to keep certain, and blade can produce abnormal vibrations, the breakage of blade meeting sometimes.
As mentioned above, though the spy opens the variety of issue that the described technology of flat 10-30812 communique has solved the condensed water about with low load combustion the time, do not solve the running problem of unstable of suction device.In addition, because described exhaust pipe 50 of this communique and bypass pipe 51 have control valve separately, so also have its control complicated problems.
For the surface of being pined for steel adding of continuous-type furnace maintains good state, the atmosphere of strictly controlling in the stove is important.For example, the oxygen concentration of furnace atmosphere rises, interior material-to-be-heated surface oxidation, nitrogenize or the decarburizations etc. such as steel of stove that then promote to pack into, if directly be rolled, then surface quality of products reduces.For improving or keeping product quality, the oxygen concentration that must suppress furnace atmosphere rises.Therefore, the oxygen concentration of correctly measuring furnace atmosphere is important.
Except oxygen concentration, to carbon monoxide in the furnace atmosphere and nitrogen oxide etc. too, it is important correctly measuring its concentration.Nitrogen is influential to the nitrogenize of steel surface, and carbon monoxide can be used to detect the imperfect combustion of burner, and nitrogen oxide is to consider in the management of environment discharge standard value.
At this, open in the clear 62-40312 communique the spy and to have disclosed following method, be about to measure the various gauge heads that oxygen concentration and carbonomonoxide concentration are used in the heating furnace and be set as the mode that moves freely,, come the air ratio of Correction and Control burner by obtaining mean intensity value in several mensuration concentration that locates.
But, in order to measure concentration, must newly establish drive system and control system, so the cost of equipment height.Have problems such as maintenance is miscellaneous, and the heating furnace intricately is equipped with pipeline and optional equipment class,, is difficult to newly establish drive system and control system so most applications is not have configuration space.
In addition, Te Kaiping 9-53120 communique has disclosed such heating furnace, it is inboard and at the downside of slideway promptly to extract the furnace wall of side out at heating furnace, along the stove cross direction spaced walls is set, and has oxymeter and atmosphere gas is discharged to the blast pipe of stove external application between this spaced walls and extraction wing furnace wall.Disclosed in this heating furnace top and carried out the flow-control in the blast pipe with above-mentioned oxymeter mensuration oxygen concentration, limit.
But,, must insert gauge head from furnace bottom or furnace wall in order to measure with the oxymeter that is located at spaced walls and extract out between the wing furnace wall.If insert gauge head from furnace bottom, then because iron sheet etc. fall and pile up, gauge head produces damaged and stops up, so be difficult to carry out for a long time the high concentration determination of reliability.In addition, if insert gauge head from the furnace wall, then gauge head is exposed to the high-temperature area in the stove and produces bending, and measuring point can misplace and maybe can produce damage.
Summary of the invention
One of purpose of the present invention is to propose a kind of air that can positively prevent and invades the furnace pressure control method in the heating furnace.
The intrusion of the air of inventors when becoming negative pressure in the stove is studied with great concentration.Air is invaded in the stove from pack into fire door and extraction fire door two sides.As shown in Figure 1, be provided with flue 7 in the back of the fire door 1a that packs into.The air of invading from the fire door 1a that packs into directly is extracted in the flue 7 and is discharged to outside the stove.Distinguished the air of invading from the fire door 1a that packs into be difficult to become cause that oxygen concentration in the stove rises and stove in the major reason of temperature reduction.In the stove oxygen concentration rise and stove in temperature reduce, it is important avoiding from extraction fire door invading air.Therefore, draw such opinion, it is very important promptly suitably controlling the furnace pressure that is provided with the soaking zone of extracting fire door out.
In addition, as mentioned above, control furnace pressure by the flashboard that switching is located in the flue, this is difficult to make the furnace pressure of the conveying road lower zone of soaking zone to become malleation especially under the less situation of burning load.This is because the generating capacity of waste gas reduces, and the pressure loss of the waste gas in the stove before discharging from flue reduces, in addition, in stove more downwards, air-flow is big more.Furnace pressure distribute relatively along with to the heating furnace below near and reduce gradually, at the bottom band, compare with the pressure loss of waste gas, air-flow increases, and becomes negative pressure easily.
The heating source of continuous-type furnace uses heat-accumulating burner, can carry out the heat in the waste gas is used to again furnace operation combustion air, that heat loss is few of preheating burner.Furnace pressure control for the heating furnace that uses heat-accumulating burner is studied.Found that particularly the lower area in the soaking zone uses under the situation of heat-accumulating burner as heating source,, can carry out strict furnace pressure control, so finished the present invention by utilizing the distinctive mechanism of heat-accumulating burner.
That is, the present invention is a kind of furnace pressure control method of utilizing heat-accumulating burner, it is characterized in that, on the heating furnace that uses heat-accumulating burner, according to the burning load of whole heating furnace, regulate the waste gas attraction rate that is drawn onto heat storage from above-mentioned burner, control the furnace pressure of soaking zone.
In addition; inventors have carried out discovering the heat exchanger that is located in the flue in order to protect with keen determination for the method that burning load hour also can make the furnace pressure of the conveying road lower zone of soaking zone become malleation, can utilize the diluent air control furnace pressure of the heat exchanger entrance side of supplying with flue.
Promptly; the present invention is a kind of furnace pressure control method of heating furnace; it is characterized in that; disposing heat exchanger at the flue that the waste gas in heating furnace guiding stove is outer on the way, when being the combustion air of burner, be not subjected to the infringement of high-temperature atmosphere in order to protect heat exchanger with the heating source of the pre-heat supply heating furnace of this heat exchanger; when the heat exchanger entrance side of flue is supplied with diluent air; according to the EGT of heat exchanger entrance side and the burning load of heating furnace, regulate the flow of diluent air, the control furnace pressure.
One of purpose of the present invention is to propose a plan from extracting fire door method of invading air in heating furnace out for preventing definitely.In addition, one of purpose of the present invention is to provide the heating furnace of this method use.
The intrusion of the air of inventors when becoming negative pressure in the stove is studied with keen determination, distinguish in this case, air is invaded in the stove from pack into fire door and extraction fire door two sides, but as shown in Figure 1, owing to be provided with flue 7 in the back of the fire door 1a that packs into, so in the direct suction flue 7 of air of invading from the fire door of packing into and discharge out of the furnace, state this can not become cause that oxygen concentration in the stove rises and stove in the main cause of temperature reduction.Thereby, in the stove oxygen concentration rise and stove in temperature reduce, it is important avoiding from extracting a mouth invading air out.Therefore, recognize that it is important positively cutting off the air intrusion at the extraction end.
Even one of purpose of the present invention is under the less situation of the burning load of heat-accumulating burner, the method for operating of the heating furnace that the running of waste gas suction device also can be stable proposes a plan.In addition, one of purpose of the present invention is to provide the heating furnace that the method for operating of this heating furnace is used.
Inventors reduce the burning load of heat-accumulating burner, the suction device of waste gas is had to for example less than 10% load running the time, improving the method mirror meaning ground of the operating load of this suction device studies, discovery is very favourable from the flue outside the waste gas guiding stove of heating furnace is imported suction device with waste gas, thereby has finished the present invention.
One of purpose of the present invention is that the method for utilizing existing equipment can correctly heat the concentration determination of the composition gas in the furnace atmosphere is proposed a plan.Another object of the present invention is to provide the heating furnace of the concentration determination of the composition gas that can heat in the furnace atmosphere.
In the furnace operation of using heat-accumulating burner, be to heat by for example carrying out the technical process shown in Fig. 2 A and Fig. 2 B repeatedly every tens of seconds, realize the few furnace operation of heat loss.
In the furnace operation of using this heat-accumulating burner, attract owing to carry out the waste gas of heat-accumulating burner at a high speed, so on a large scale, attract to be distributed in the waste gas on the stove cross direction.Inventors are conceived to this phenomenon, discovery is reproduced furnace atmosphere well by waste gas in the stove of heat-accumulating burner attraction, the waste gas that heat-accumulating burner attracted is carried out the mensuration of constituent concentration if die, then can correctly measure the constituent concentration of furnace atmosphere, thereby finish the present invention.
Main points of the present invention are as follows.
1. furnace pressure control method of utilizing heat-accumulating burner, it is characterized in that, has the preheating zone, heating tape and soaking zone also are provided with on the heating furnace of array heat-accumulating burner, this heat-accumulating burner is as the thermal source of soaking zone, the paired burner of heat storage is set up in configuration relatively, each that makes heat-accumulating burner alternately burnt to burner, and when not burning, attract waste gas in the stove from burner, waste gas is imported above-mentioned heat storage, with the heat recovery in the waste gas in heat storage, the combustion air of the burner the when heat that is reclaimed is used for heating flame, when carrying out the operation of heating furnace, regulate the waste gas attraction rate that sucks heat storage from above-mentioned burner according to the burning load of whole heating furnace, the furnace pressure of control soaking zone.
2. the furnace pressure control method of a heating furnace; it is characterized in that; in way, be provided with heat exchanger with the flue outside the guiding of the waste gas in the heating furnace stove; when being the combustion air of burner with the heating source of the pre-heat supply heating furnace of this heat exchanger; in order to protect heat exchanger not to be subjected to the infringement of high-temperature atmosphere; when the heat exchanger entrance side of flue is supplied with diluent air, regulate the flow of diluent air, control furnace pressure according to the burning load of the EGT of heat exchanger entrance side and heating furnace.
3. the atmosphere control method of a heating furnace, it is characterized in that, when opening the extraction fire door of heating furnace, several heating that are provided in this heating furnace are controlled with the burning of burner independently with heating among the burner, that be configured in the lower area of stove extraction end, the flame of this burner is prolonged along this A/F on the width of extracting mouth out, cut off from extracting the intrusion road of mouthful invading air out with burner flame, suppress the rising of oxygen concentration in the stove.
4. the atmosphere control method of a heating furnace is characterized in that, in 3, in the stove inboard of the heating that is configured in stove extraction end with burner, be provided with upright spaced walls from the furnace bottom, form ascending air, make from extracting a mouthful air of invading out to enter the above-mentioned ascending air along this spaced walls.
5. the atmosphere control method of a heating furnace is characterized in that, in 3 or 4, makes to be configured in heating that stove extracts end out with the burner running of burning under low air ratio condition.
6. furnace operation method with heat-accumulating burner, it is characterized in that, have on the heating furnace of heat-accumulating burner that relatively sets the subsidiary paired burner that heat storage arranged as heating source, each that makes heat-accumulating burner alternately burnt to burner, and the burner during from non-burning attracts the waste gas in the stove, waste gas is imported above-mentioned heat storage, with the heat recovery in the waste gas in heat storage, the combustion air of the burner the when Btu utilization of this recovery is come heating flame, when carrying out the operation of heating furnace, under the less situation of the burning load of heat-accumulating burner, with the warm-air supply suction device, this suction device is used for attracting waste gas in the stove from the burner in above-mentioned non-when burning by heat storage.
7. in the method for operating of the heating furnace described in 6, it is characterized in that hot blast is with the waste gas in the flue outside the guiding of the waste gas in the heating furnace stove.
8. the assay method of atmosphere gas concentration in the heating furnace, it is characterized in that, have on the heating furnace of heat-accumulating burner that relatively sets the subsidiary paired burner that heat storage arranged as heating source, each that makes heat-accumulating burner alternately burnt to burner, and the burner during from non-burning attracts the waste gas in the stove, waste gas is imported above-mentioned heat storage, with the heat recovery in the waste gas in heat storage, the combustion air of the combustion mouth the when heat of this recovery is used for heating flame, when carrying out furnace operation, to import analyzer from a part of waste gas that above-mentioned burner attracts, the constituent concentration in the waste gas will be measured.
9. the assay method of the atmosphere gas concentration in the heating furnace is characterized in that, the component concentration measuring value of the waste gas that attracts from heat-accumulating burner in 8 is used as the typical value of the constituent concentration of the band in the heating furnace that is provided with this heat-accumulating burner.
10. heating furnace, have relatively set the subsidiary paired burner that heat storage arranged several heat-accumulating burners as heating source, each that makes this heat-accumulating burner alternately burnt to burner, and the burner during from non-burning attracts waste gas in the stove, waste gas is imported above-mentioned heat storage, with the heat recovery in the waste gas in heat storage, the combustion air of the burner the when heat of this recovery is used for heating flame, the heating furnace of operating like this, it is characterized in that the heat-accumulating burner that is configured in the lower area of heating furnace extraction end at least has the independently combustion control system that separates with other heat-accumulating burner.
11. a heating furnace is characterized in that, in 10, and heating furnace extract out and to sandwich between the fire door on the position with heat-accumulating burner of combustion control system independently, be provided with upright spaced walls from the furnace bottom.
12. heating furnace, to have relatively set the subsidiary paired burner that heat storage arranged several heat-accumulating burners as heating source, each that makes this heat-accumulating burner alternately burnt to burner, and the burner during from non-burning attracts waste gas in the stove, waste gas is imported above-mentioned heat storage, with the heat recovery in the waste gas in heat storage, the combustion air of the burner the when heat of this recovery is used for heating flame, the heating furnace of operating like this, it is characterized in that, burner from non-burning the time, attract the end of the path of waste gas in this heating furnace to be provided with suction device by heat storage, be provided with the pipeline that hot blast is imported suction device by open and close valve at the suction device entrance side of this path.
13. the heating furnace described in 12 is characterized in that, pipeline is connected with the outer flue of stove that the waste gas in the heating furnace is led, and guiding is as the waste gas in the heating furnace of hot blast.
14. a heating furnace in 12 or 13, is provided with heat exchanger at the upstream side of the pipeline of flue.
15. heating furnace, to have relatively set the subsidiary paired burner that heat storage arranged several heat-accumulating burners as heating source, make this heat-accumulating burner each burner is alternately burnt, and the burner during from non-burning attracts waste gas in the stove, waste gas is imported above-mentioned heat storage, with the heat recovery in the waste gas in heat storage, the combustion air of the burner the when heat of this recovery is used for heating flame, the heating furnace of operating like this, it is characterized in that, burner from non-burning the time, discharge in the way of the path of waste gas in this heating furnace the analyzer that is provided with the gauge head of gathering a part of waste gas and the constituent concentration of the waste gas gathered is measured by heat storage.
Description of drawings
Fig. 1 is the figure of the structure of expression continuous-type furnace.
Fig. 2 A is the figure of the structure of expression heat-accumulating burner.
Fig. 2 B is the figure of the structure of expression heat-accumulating burner.
Fig. 3 is the figure of the waste gas drain passageway of the existing heating furnace of expression.
Fig. 4 is the figure of the waste gas drain passageway of expression heating furnace of the present invention.
Fig. 5 is the figure of the structure of expression continuous-type furnace used in the present invention.
Fig. 6 is the figure of the relation of expression waste gas attraction rate and furnace pressure.
Fig. 7 is the figure of the relation of expression furnace pressure and invading air amount.
Fig. 8 is the figure of the structure of expression continuous-type furnace used in the present invention.
Fig. 9 is the figure of the relation of expression Flow-rate adjustment valve opening of diluent air and furnace pressure.
Figure 10 is the figure of the relation of oxygen concentration in expression furnace pressure control method and furnace pressure and the stove.
Figure 11 is the figure of the relation of expression furnace pressure control method and furnace pressure.
Figure 12 is the figure of the relation of oxygen concentration in expression furnace pressure control method and the stove.
Figure 13 is the figure of expression heating with configuration in the stove of burner.
Figure 14 is the figure of the extraction mouth of expression heating furnace.
Figure 15 is the figure that the expression heating furnace is extracted near the air stream of end out.
Figure 16 is that expression is heated with the air ratio of burner and the figure of the relation of the quantity combusted that enters air.
Figure 17 is the figure of expression from the drain passageway of the waste gas of heat-accumulating burner discharge.
Figure 18 is the in all sorts of ways measured value of the interior oxygen concentration of mensuration stove and the figure that the interior average oxygen concentration of stove compares.
The specific embodiment
Below, with reference to accompanying drawing method of the present invention is described in detail.Fig. 5 represents the continuous-type furnace that the inventive method is directly used.This heating furnace is substantially the same with stove shown in Figure 1.But, be at least at bottom configuration array Fig. 2 A and the heat-accumulating burner 40a shown in Fig. 2 B and the example of 40b on the conveying road 5 of soaking zone 3.In Fig. 5, comprise that the symbol of dual-purpose path and heat storage and 40a and 40b represent.The operation of this heating furnace, according to the burning load of whole heating furnace, adjusting is controlled furnace pressure from the waste gas attraction rate in above-mentioned burner 40a and 40b suction heat storage 42a and the 42b.Specifically, it is characterized in that the furnace pressure control of bottom band is become malleation.
Promptly, the operation of above-mentioned heating furnace, with the furnace pressure meter actual measurement furnace pressure that is arranged on the bottom, soaking zone, according to the target furnace pressure, with the exhaust gas flow of Flow-rate adjustment valve regulation by the heat storage of heat-accumulating burner, control waste gas attraction rate like this, is controlled to be the target furnace pressure with bottom band, the particularly furnace pressure of bottom, soaking zone.
Fig. 6 represents the relation of waste gas attraction rate and furnace pressure.The expression said method, the furnace pressure of the bottom, soaking zone when regulating waste gas attraction rate and the relation of waste gas attraction rate according to burning load.The relation that waste gas attraction rate and furnace pressure roughly are inversely proportional to.By regulating waste gas attraction rate, can strictly control furnace pressure.So-called waste gas attraction rate means the exhausted air quantity of heat-accumulating burner suction and the ratio of the exhausted air quantity that burning produced of heat-accumulating burner.By just obtaining with the actual measurement of the exhaust gas flow meter on the exhaust piping that is arranged on heat-accumulating burner exhaust gas flow.
In addition, furnace pressure, by the adjusting of above-mentioned waste gas attraction rate, preferably the furnace pressure with the bottom, soaking zone is controlled in 0～0.5mmAq scope.If the furnace pressure of bottom, soaking zone is controlled at more than the 0.5mmAq, then the furnace pressure on top, soaking zone is too high, and furnace gas blows out outside stove, can damage the extraction fire door.Unit consumption of fuel also improves.
Fig. 8 represents the continuous-type furnace that the inventive method is directly used.This heating furnace is substantially the same with the structure of heating furnace shown in Figure 1.This heating furnace has following structure, and promptly waste gas surpasses on the heat resisting temperature of heat exchanger 7a in limited time in the stove of delivery heat exchanger 7a, diluent air 8 is supplied with the entrance side of the heat exchanger 7a of flues 7, with protection heat exchanger 7a.
In the operation of the heating furnace of this structure, except when EGT surpasses the heat resisting temperature of heat exchanger 7a, also supply with diluent air 8 when the furnace pressure of 3 particularly bottom is lower than desired value in the soaking zone.It is characterized in that, by supplying with the diluent air 8 of regulation flow, the furnace pressure control of the lower area of soaking zone 3 is become malleation.
That is, as shown in Figure 8, furnace pressure measured value PI and the target furnace pressure (malleation) that the furnace pressure meter 3b with the lower area that is arranged on soaking zone 3 measures compared with arithmetic unit 9a.According to its result, at first carry out the aperture setting of the flashboard 7b of furnace pressure control usefulness, thereby carry out furnace pressure control by arithmetic unit 9a.
At this usually in the operation, with arithmetic unit 9b to being that the heat resisting temperature upper limit of heat exchanger 7a compares with the waste gas target temperature of this position with the temperature measuring value T.I of the thermometer 7c mensuration of the heat exchanger 7a entrance side that is located at flue 7.If temperature measuring value T.I is near the heat resisting temperature upper limit of heat exchanger 7a, the then instruction of sending according to arithmetic unit 9b gives suitable rotation speed of the fan and Flow-rate adjustment valve opening respectively to Air Blast fan 8a and the flow control valve 8b that supplies with diluent air 8 usefulness.Supply with flue 7 by the diluent air 8 that will stipulate flow, diluent air 8 is sneaked in the waste gas, the EGT that just will import heat exchanger 7a is reduced to allowed band.When temperature measuring value T.I equates with above-mentioned target temperature, fan attachment rotating speed and flow rate regulating valve aperture.
In addition, in above-mentioned common operation, for example the burning load of burner reduces, the furnace pressure measured value P.I that furnace pressure meter 3b measures departs from objectives furnace pressure and when becoming suction side, give suitable rotation speed of the fan and Flow-rate adjustment valve opening by arithmetic unit 9a respectively to Air Blast fan 8a and flow control valve 8b, the diluent air 8 of regulation flow is supplied with flue 7, so that furnace pressure rises.That is, when diluent air 8 was supplied with flue 7, by the gas flow increase of flue 7, so the pressure loss of flue 7 increases, furnace pressure rose.Its result can avoid the furnace pressure of the lower area of soaking zone 3 to become negative pressure.When furnace pressure measured value P.I equates with above-mentioned target furnace pressure, fan attachment rotating speed and Flow-rate adjustment valve opening.
Fig. 9 represents the relation of furnace pressure of the lower area of the Flow-rate adjustment valve opening of diluent air 8 and soaking zone 3.By the Flow-rate adjustment of diluent air 8, the control range of furnace pressure is very big.Even under the little situation of the burning load of burner, also can easily make the furnace pressure of the lower area of soaking zone 3 become malleation by supplying with diluent air 8.And, owing to utilize existing equipment, need not carry out new equipment investment.
On continuous-type furnace shown in Figure 1, several heating in being provided in its stove are with among the burner 4, to be provided in stove extract out end lower area heating with burner 40 adopt with other heating with the different independently control system of burner 4, control the burning that burner 40 is used in this heating independently.
Here, the burning in the heating furnace is used burner 4 as shown in figure 13, and relatively being adapted to right 4a and 4b between the two side of heating furnace is general example.Heating for the lower area that is configured in stove extraction end also is configured burner 40a and 40b in couples with burner 40.
For the material that is heated that heating furnace heated is extracted out outside the stove, when opening the extraction fire door 3a of heating furnace, the burning with burner 40a and 40b is heated in control independently.Shown in Fig. 2 A and Fig. 2 B, open heating and extracting out with the burner flame of burner 40a and 40b on the width of mouthful 3b with extending extracting fire door 3a out along the A/F running of burning.If form like this along the burner flame of the A/F of extracting mouthful 3b out, then enter air in the stove from extracting mouthful 3b out, at first cut off by burner flame, can not further enter in the stove.And the oxygen in the invading air is fallen by this burner consumed by fire, so the rising of oxygen concentration in the stove that can avoid causing because of invading air.
Particularly as shown in figure 14, the extraction fire door that has the V shape peristome 3c of comb teeth shape in the bottom of extracting mouthful 3b out, enter air from this V shape peristome 3c easily, so extract the heating of the lower area of end out to cut off air intrusion path with the burner flame of burner 40a and 40b be very effective to be configured in stove.In addition, heating makes independent heating get final product to the burning control that the stove cross direction extends with the burner flame of burner with the occasion that burner does not dispose in pairs.
At this, the formation position of the burner flame of burner 40a and 40b is used in heating, on the furnace superintendent direction, and in burner flame does not touch the scope of the works of extracting mouthful bottom out, and preferably as best one can near extracting mouth out.In addition, on the short transverse of stove, burner flame is in the position that can block the V shape peristome, and is preferably in the scope at the bottom of the contact furnace not.
In addition, as shown in figure 15, be preferably in the stove inboard of heating, be provided with from the upright spaced walls 8 of furnace bottom with burner 40a and 40b, and with the burner flame partition air inlet passage of heating with burner 40a and 40b.
Here, the pressure distribution in the stove is the boundary to carry road 6 as shown in figure 15, and the top pressure (be substantially atmospheric pressure) outer with respect to stove is malleation, but the bottom is a negative pressure.That is, in stove, it is big more to arrive the below air-flow more usually, so furnace pressure presents such distribution, along with downwards near and reduce.On such heating furnace, Zone Full becomes malleation in the stove if make, and then the stove internal upper part reaches than higher pressure, the result, and furnace gas can be from each peristome ejection.Therefore, control, make carrying that furnace pressure equates with atmospheric pressure on the height and position on road 6 with flashboard 7b (with reference to Fig. 1).
Particularly flow to conveying 6 bottoms, road from the air that V shape peristome 3c invades from extracting mouthful 3b out, the burner flame that major part is heated with burner 40a and 40b sucks.Because it is low temperature that invading air is compared with temperature in the stove, so shown in dotted line in Figure 15, the part of invading air flows into to the direction of sneaking into furnace bottom.Because this invading air flows into from rear side deep in stove of heating with burner 40a and 40b, so though amount is few, invade in the stove easily.
If establish spaced walls 8, then be spaced apart wall 8 with the air of the rear side intrusion of burner 40a and 40b and block from above-mentioned heating.Here be heated gradually and become, arrive the barotropic field of carrying 6 tops, road, so be discharged to outside the stove from conveying 6 tops, road along the upwelling of spaced walls 8.Like this, also can prevent in its intrusion stove for the air of invading with burner 40a and 40b rear side from heating.
In addition, when cutting off air and invade path with the burner flame of burner 40a and 40b, preferably make heating with burner 40a and the 40b running of under the condition of hanging down air ratio, burning with heating.The heating that Figure 16 represents to extract out end with the air of the air ratio of burner and intrusion in the relation of this heating with the quantity combusted on the burner.As known in the figure, if heating uses the air ratio of burner to descend, then invading air increases with the quantity combusted on the burner in heating.If make heating with burner 40a and the 40b running of under low air ratio condition, burning, can make then that mouthful airborne oxygen of 3b intrusion is direct to burn and consume from extracting out, be effective to making furnace atmosphere remain on low oxygen concentration.In addition, the size of spaced walls 8 between the stove two side in the scope of not disturbing the conveying device class in the stove, increases the height on furnace bottom, is favourable to cutting off invading air and forming ascending air.
Fig. 4 represents to be directly used in the waste gas drain passageway of the continuous-type furnace of the inventive method.To the path 45 of suction device shown in Figure 48 and flue 7, be provided with pipeline 10 by heat storage 42a or 42b from the burner 40a shown in Fig. 2 A and Fig. 2 B or 40b.Be characterised in that,, be provided with the pipe arrangement road 10 that the waste gas in the flue 7 is imported suction device 8 by open and close valve 9 at the entrance side of suction device 8 and between with the flue 7 outside the guiding of the waste gas in the heating furnace stove.On path 45, at the entrance side of suction device 8, the upstream side of the connecting portion of pipeline 10 is provided with flowmeter 45a, is used for measuring from burner sucking the waste gas traffic attraction, judges the switching time of open and close valve 9.In addition, be provided with flow control valve 45b between the connecting portion of pipeline 10 and path 45 and suction device 8, being used for the total Flow-rate adjustment is ormal weight.
On heating furnace with above waste gas drain passageway, burning load at heat-accumulating burner reduces, make under for example the state of suction device 8 less than 10% load running, the open and close valve 9 of above-mentioned pipeline 10 is opened, with suction device 8 entrance sides of the importing of the waste gas in the flue 7 path 45, the operating load of suction device 8 is increased.
Specifically, when the waste gas in the flue 7 are imported path 45, make the upper limit of waste gas and the durable temperature of the particularly impeller that is no more than suction device 8 by the mixed EGT of the low temperature waste gas of heat storage in the flue.Select the caliber of pipeline 10, the flow of control waste gas makes the pressure loss of waste gas in the flue of mixing point and the low temperature waste gas by heat storage equate simultaneously, mix waste gas is imported suction device 8 again.
By this operation, can realize making the operating load of suction device 8 for example to rise to more than 10% the above-mentioned variety of issue in the time of can solving utmost point low load combustion simply.
Then, when the traffic attraction of burner surpasses necessary minimum flow, the supply by waste gas in the flue of pipeline 10 is stopped.That is blind off a line 10 open and close valve 9.Steady running zone lower limit when so-called necessary minimum flow means the design fan.
In addition, the flow-control that imports the waste gas of above-mentioned suction device 8 also can be carried out as flow control valve by the open and close valve 9 with pipeline 10.But the operation of flow control valve is miscellaneous, and its structure is also complicated, and setup fee is also high.In the present invention, adopt the short-cut method of the pipeline 10 that opens and closes the regulation caliber simply.
At this, the caliber of pipeline 10 for example can be according to following formula (A) and (B) is designed.
(waste gas dew point)≤Ta≤Tb... (A)
ΔP1＝ΔP2...(B)
In the formula,
Ta: be the temperature of the mix waste gas of V2=V1+V3
Tb: the durable temperature upper limit of suction device (is representative with the bearing)
At this,
V1: the waste gas traffic attraction during the minimum burning of burner (utmost point underload)
V2: be the necessary minimum flow of the waste gas that makes the suction device steady running
V3: be the exhausted air quantity of the difference of replenishing V2-V1
Δ P1: the pressure loss between burner on the path 45 and the pipeline junction of two streams
Δ P2: the pressure loss on the pipeline 10
In addition, as shown in Figure 4, be provided with heat exchanger 7a at the upstream side of the pipeline 10 of flue 7.By waste gas in the stove is fed heat exchanger 7a, like this, will become the waste gas feeding pipe 10 of low temperature, this is more satisfactory to the durable life-span that prolongs suction device 8.
Above-mentioned form of implementation is not that the waste gas in the heating furnace directly is mixed into from the waste gas that burner is discharged, but waste gas in the flue is mixed into from the waste gas that burner is discharged, so can not be subjected to external interference for the furnace pressure of heating furnace.
Sneak into the gas from the waste gas that burner is discharged, need not be confined to waste gas in the flue, the gas that can be high temperature is hot blast.For example, can be the air that is heated to high temperature, perhaps also can establish burner in addition, the burnt gas that produces with this burner mixes.
Shown in Fig. 2 A and 2B, on heat-accumulating burner, the waste gas that is attracted by burner 40a or 40b passes through outside dual-purpose path 41a or the 41b guiding stove.The attraction of this waste gas is to carry out with path shown in Figure 17.Promptly, will be on the dual-purpose path 41a and the intensive exhaust piping 8a and 8b on each burner group of a side of being located at the furnace wall respectively and opposite side of 41b of the extension of array heat-accumulating burner, and exhaust piping 8a and 8b is intensive on 1 conduit 9, make this conduit 9 by attracting fan 10, being communicated with the flue 7 of heating furnace.Utilize to attract the attraction of fan 10,,, be discharged to outside the stove the waste gas flue 7 that leads by dual- purpose path 41a and 41b, exhaust piping 8a and 8b and conduit 9.
On above waste gas drain passageway, in example shown in Figure 17, in the way of conduit 9, insert gauge head 11.Be captured in a part of waste gas that flows in the conduit 9 by this gauge head 11, measure the concentration of various compositions with the waste gas of 12 pairs of these collections of analyzer.Resulting so various mensuration concentration value has been represented the distribution of the particularly stove cross direction of furnace atmosphere well.Can be with its typical value as the constituent concentration of position, for example soaking zone 3 in the stove that heat-accumulating burner is set.
At this, measure the occasion of oxygen concentration and, investigated error with respect to average oxygen concentration in the stove by measure the occasion of oxygen concentration from the gauge head of furnace wall insertion for gathering from the waste gas of above-mentioned heat-accumulating burner attraction.It the results are shown in Figure 18.As known in the figure, gather the occasion that the waste gas that attracts from heat-accumulating burner is measured oxygen concentration, minimum with the difference of average oxygen concentration in the stove of reality.That is,, can measure the constituent concentration of actual furnace atmosphere by inquiry from the waste gas of heat-accumulating burner attraction.In addition, in the stove average oxygen concentration be close extract fire door and the fire door of packing into out, be 0Nm invading furnace air
3The furnace pressure of/h imposes a condition down, according to the gas flow, gas componant and the air ratio that drop into burner, the calculated value of obtaining theoretically.Other condition is expression in detail in embodiment described later.
In addition, the position of gathering the waste gas that attracts from heat-accumulating burner is preferably in the downstream of the hot body of heat-accumulating burner as shown in figure 17.By the EGT behind the heat storage recovery heat, lower than temperature in the stove certainly.Gauge head is inserted in downstream at heat storage, and gauge head can not be exposed in the high-temperature atmosphere, can prolong its service life.
Above example has illustrated the situation of using continuous-type furnace, and batch-type heating furnace and rotary heating furnace etc. also can adopt this invention.
With continuous-type furnace shown in Figure 5 (landline height: from furnace bottom 0.5m), the thickness of packing into is that 220mm, width are that 1200mm and length are the plate slab of 9800mm, carries out being heated to from room temperature 1230 ℃ heating operation.The specification of 4 groups of heat-accumulating burners that is configured in the heating furnace soaking zone is as follows.
Burning capacity: 20000000 (Kcal/H burners)
Burning conversion time between a pair of burner: 60s/ time
Waste gas attraction rate: 0.4～0.8 (one)
The operation of above-mentioned heating furnace is as shown in table 1, according to the burning load amount of whole heating furnace, the waste gas attraction rate of burner is carried out various adjustings control furnace pressure.In addition, for making comparisons, also carried out waste gas attraction rate is made as certain existing operation.Its result under the various burning load conditions when the heating furnace practical operation, can stablize the control furnace pressure, and is as shown in table 2, compares with existing method, and oxygen concentration significantly reduces in the stove, can reduce unit consumption of fuel and slab fraction defective.
In addition, bottom, the soaking zone furnace pressure that will be when aforesaid operations and the relation of invading air amount are shown in Fig. 7 fifty-fifty through arrangement.
With continuous-type furnace shown in Figure 8 (landline height: from furnace bottom 0.5m), the thickness of packing into is that 220mm, width are that 1200mm and length are the plate slab of 9800mm, carries out being heated to from room temperature 1230 ℃ operation.Operating condition is as follows.
Heating furnace (burner) burning load: 10～100%
Diluent air flow: 0～50000 (Nm
3/ H)
Heat exchanger entrance side EGT: below 750 ℃
The flashboard aperture of flue: 5～100%
In above-mentioned furnace operation, heat exchanger entrance side EGT is more than 750 ℃ the time or the furnace pressure of the lower area of soaking zone is 0mmAq when following, supplies with diluent air with the condition of heat exchanger entrance side EGT≤750 ℃ and bottom, soaking zone furnace pressure＞0mmAq.In addition, in order to make comparisons, also carried out carrying out the operation of furnace pressure control without diluent air.
In these operations, when the burning load of heating furnace is made many variations, to extract fire door out be that furnace pressure and this regional oxygen concentration of the soaking zone lower area of closed condition measured.Its measurement result is carried out furnace pressure control with diluent air as shown in figure 10, can make furnace pressure keep malleation, and can make oxygen concentration also keep low-level.In contrast to this, only with existing flashboard control furnace pressure, furnace pressure and oxygen concentration all produce very big variation.
In addition, in same operation, furnace pressure and oxygen concentration when extracting fire door out to opening and closing are similarly measured, its measurement result is respectively as Figure 11 and shown in Figure 12, even opening and closing under the situation of extracting fire door out, owing to carry out furnace pressure control with diluent air, also can make furnace pressure keep malleation, and make oxygen concentration also keep low-level.
In continuous-type furnace shown in Figure 1, carried out plate slab is heated to from room temperature 1150 ℃ operation.When the plate slab after the heating was extracted out from extracting fire door 3a out, the heating of extracting end out was with burner 40a and the 40b running of burning under the conditions shown in Table 3.In addition, on continuous-type furnace shown in Figure 1, be provided with spaced walls shown in Figure 15 8, in operation, under the condition of showing of table 3, extract plate slab out with such continuous-type furnace by following specification.And in order to make comparisons, original furnace operation of also having carried out making the heating of extracting end out under same condition, to burn and turn round with burner 4 with burner 40a and 40b and other heating.
The air capacity in the intrusion heating furnace in the above various operations and the oxygen concentration of soaking zone atmosphere are measured, and the result lists table 3 in.
Spaced walls height: the above 1.2m of furnace bottom
Width: wide identical with stove
(the landline height: the above 0.5m of furnace bottom), the thickness of packing into is that 220mm, width are that 1200mm and length are the plate slab of 9800mm, carries out being heated to from room temperature 1230 ℃ operation with continuous-type furnace shown in Figure 1.The specification of 4 groups of heat-accumulating burners that is configured in the heating furnace soaking zone is as follows.
Burning capacity: 2000000 (Kcal/H burners)
Burning load: 10～100%
Burning conversion time between a pair of burner: 60s/ time
Waste gas attraction rate: 60～90%
In the operation of above-mentioned heating furnace, the waste gas that attracts from heat-accumulating burner is gathered a part of waste gas by the gauge head that inserts in conduit 9 ways, with the 12 pairs of waste gas of being gathered mensuration of analyzer oxygen concentration by behind the heat storage.The oxygen concentration determination scope is 0～21Vol% in the stove, and atmosphere temperature is 200 ℃ in the pipe of conduit 9.In addition, in order to make comparisons,, measured oxygen concentration by the gauge head that inserts from the furnace wall of soaking zone.
These are measured the result that average oxygen concentration is done contrast in concentration values and the stove, as shown in figure 18,, use the occasion of measuring from the waste gas of heat-accumulating burner attraction according to the present invention, with the error of average oxygen concentration value in the stove less than 0.5%.And measure the occasion of oxygen concentration by the gauge head that inserts from the furnace wall, with the error of average oxygen concentration value in the stove be 1～3%.
The possibility of utilizing on the industry
As mentioned above, can strictly carry out furnace pressure control according to the present invention.By this furnace pressure control, can prevent positively that air from entering in the heating furnace from extracting fire door out.Can prevent that material-to-be-heated quality from reducing.Can reduce the unit consumption of fuel of heating furnace.According to the present invention, even under the less situation of the burning load of heat-accumulating burner, the running of waste gas suction device also can be stablized.Owing to do not produce condensed water, so the stable operation of heating furnace.According to the present invention, can correctly measure the constituent concentration of heating furnace atmosphere.By the Atmosphere Control of carrying out, can produce high-quality product according to this measured value.The assay method of the constituent concentration of mensuration heating furnace atmosphere of the present invention can utilize existing equipment to carry out, so do not need new equipment investment, can realize with lower cost.
Table 1
| Operation | The burning load of whole heating furnace (%) | Example | Original example | ||
| Waste gas attraction rate (one) | Bottom, soaking zone furnace pressure (mmAq) | Waste gas attraction rate (one) | Bottom, soaking zone furnace pressure (mmAq) | ||
| ??1 | ??20 | ??0.4 | ??0 | ??0.8 | ???-1.4 |
| ??2 | ??30 | ??0.4 | ??0 | ??0.8 | ???-1.0 |
| ??3 | ??40 | ??0.5 | ??0 | ??0.8 | ???-0.7 |
| ??4 | ??50 | ??0.5 | ??0.1 | ??0.8 | ???-0.5 |
| ??5 | ??60 | ??0.6 | ??0.1 | ??0.8 | ???-0.3 |
| ??6 | ??70 | ??0.6 | ??0.2 | ??0.8 | ???-0.1 |
| ??7 | ??80 | ??0.7 | ??0.2 | ??0.8 | ???0 |
| ??8 | ??90 | ??0.7 | ??0.3 | ??0.8 | ???0.1 |
| ??9 | ??100 | ??0.8 | ??0.3 | ??0.8 | ???0.3 |
Table 2
| Invade furnace air amount (Nm 3/ | Oxygen concentration (vol%) in the stove of soaking zone | Unit consumption of fuel (*) (index) | Fraction defective (*) (index) | |
| Example | Less than 500 | Less than 1 | ??0.95 | Less than 0.1 |
| Original example | About 50000 | ??5～10 | ??1.0 | ??1.0 |
(*): the exponential representation that with the result of original example is at 1 o'clock
(the more little achievement of numerical value is good more)
Table 3
| Operation | Burning load (%) | Air ratio | Spaced walls | Invading air amount (Nm 3/H) | Oxygen concentration (vol%) | Remarks | ||
| Extract the end burner out | Other burner | Extract the end burner out | | |||||
| 1 | ??100 | ????80 | ????0.8 | ??1.05 | Do not have | ??500 | ??≤1.0 | Example |
| 2 | ??100 | ????50 | ????0.8 | ??1.05 | Do not have | ??600 | ??≤1.5 | Example |
| 3 | ??100 | ????50 | ????0.8 | ??1.05 | Have | ??300 | ??≤1.0 | Example |
| 4 | ???????????60 | ???????????1.0 | Do not have | ??5000 | ??5～10 | Original example | ||
Claims (1)
1. the furnace pressure control method of a heating furnace; it is characterized in that; in way, be provided with heat exchanger with the flue outside the guiding of the waste gas in the heating furnace stove; when being the combustion air of burner with the heating source of the pre-heat supply heating furnace of this heat exchanger; in order to protect heat exchanger not to be subjected to the infringement of high-temperature atmosphere; when the heat exchanger entrance side of flue is supplied with diluent air, regulate the flow of diluent air, control furnace pressure according to the burning load of the EGT of heat exchanger entrance side and heating furnace.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8524/01 | 2001-01-17 | ||
| JP2001008524A JP3937729B2 (en) | 2001-01-17 | 2001-01-17 | Heating furnace atmosphere control method and heating furnace |
| JP8523/01 | 2001-01-17 | ||
| JP14230/01 | 2001-01-23 | ||
| JP16974/01 | 2001-01-25 | ||
| JP17017/01 | 2001-01-25 |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB018092470A Division CN100338236C (en) | 2001-01-17 | 2001-12-27 | Heating furnace with regenerative burners and method of operating heating furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1693755A true CN1693755A (en) | 2005-11-09 |
| CN1333087C CN1333087C (en) | 2007-08-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100789456A Pending CN1693757A (en) | 2001-01-17 | 2001-12-27 | Heating furnace with regenerative burners and method of operating the heating furnace |
| CNB2005100789386A Expired - Fee Related CN1333087C (en) | 2001-01-17 | 2001-12-27 | Heating furnace with regenerative burners and method of operating heating furnace |
| CNA2005100789441A Pending CN1693756A (en) | 2001-01-17 | 2001-12-27 | Heating furnace with regenerative burners and method of operating heating furnace |
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| CNA2005100789456A Pending CN1693757A (en) | 2001-01-17 | 2001-12-27 | Heating furnace with regenerative burners and method of operating the heating furnace |
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| CNA2005100789441A Pending CN1693756A (en) | 2001-01-17 | 2001-12-27 | Heating furnace with regenerative burners and method of operating heating furnace |
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| JP (1) | JP3937729B2 (en) |
| CN (3) | CN1693757A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101900359A (en) * | 2010-09-05 | 2010-12-01 | 无锡市盛力达机械工程有限公司 | Automatic pressure control device for gas furnace pressure |
| CN103827325A (en) * | 2011-09-16 | 2014-05-28 | 本特勒尔汽车技术有限公司 | Method for producing structural components and chassis components by hot forming, and heating station |
| CN104949517A (en) * | 2015-06-19 | 2015-09-30 | 邯钢集团邯宝钢铁有限公司 | Rapid cooling method for steel rolling heating furnace heat exchanger |
| CN109141051A (en) * | 2018-10-12 | 2019-01-04 | 厦门大学嘉庚学院 | A kind of optimum design method of heat accumulating type industrial heating furnace controling of the pressure of the oven |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5452955B2 (en) * | 2009-03-13 | 2014-03-26 | 本田技研工業株式会社 | Preform heating device |
| JPWO2016153049A1 (en) * | 2015-03-26 | 2017-11-02 | 大陽日酸株式会社 | Steel product heating apparatus and method for heating steel product |
| CN106676252B (en) * | 2017-02-21 | 2018-02-23 | 东北大学 | A kind of direct flame impingement heater of sheet metal strip |
| CN117663161B (en) * | 2023-12-11 | 2024-05-14 | 星远智维邯郸环境科技有限公司 | Rotary heat accumulating type heating furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5776198A (en) * | 1980-10-30 | 1982-05-13 | Nippon Steel Corp | Control of terperature of material in heating furnace |
| JP2589541Y2 (en) * | 1993-09-30 | 1999-01-27 | 石川島播磨重工業株式会社 | Steel heating furnace |
| JP2885072B2 (en) * | 1994-05-30 | 1999-04-19 | 住友金属工業株式会社 | Heating furnace control method |
| JPH09209032A (en) * | 1996-02-01 | 1997-08-12 | Nippon Steel Corp | Method for controlling optimum furnace pressure in heating furnace |
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2001
- 2001-01-17 JP JP2001008524A patent/JP3937729B2/en not_active Expired - Fee Related
- 2001-12-27 CN CNA2005100789456A patent/CN1693757A/en active Pending
- 2001-12-27 CN CNB2005100789386A patent/CN1333087C/en not_active Expired - Fee Related
- 2001-12-27 CN CNA2005100789441A patent/CN1693756A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101900359A (en) * | 2010-09-05 | 2010-12-01 | 无锡市盛力达机械工程有限公司 | Automatic pressure control device for gas furnace pressure |
| CN101900359B (en) * | 2010-09-05 | 2012-02-15 | 无锡市盛力达机械工程有限公司 | Automatic pressure control device for gas furnace pressure |
| CN103827325A (en) * | 2011-09-16 | 2014-05-28 | 本特勒尔汽车技术有限公司 | Method for producing structural components and chassis components by hot forming, and heating station |
| CN103827325B (en) * | 2011-09-16 | 2016-01-20 | 本特勒尔汽车技术有限公司 | For passing through method and the heating station of thermoforming manufacturing structure component and chassis component |
| US9616488B2 (en) | 2011-09-16 | 2017-04-11 | Benteler Automobiltechnik Gmbh | Method for producing structural components and chassis components by hot forming, and heating station |
| CN104949517A (en) * | 2015-06-19 | 2015-09-30 | 邯钢集团邯宝钢铁有限公司 | Rapid cooling method for steel rolling heating furnace heat exchanger |
| CN109141051A (en) * | 2018-10-12 | 2019-01-04 | 厦门大学嘉庚学院 | A kind of optimum design method of heat accumulating type industrial heating furnace controling of the pressure of the oven |
| CN109141051B (en) * | 2018-10-12 | 2020-03-17 | 厦门大学嘉庚学院 | Optimal design method for furnace pressure control of heat accumulating type industrial heating furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3937729B2 (en) | 2007-06-27 |
| CN1333087C (en) | 2007-08-22 |
| CN1693756A (en) | 2005-11-09 |
| JP2002213879A (en) | 2002-07-31 |
| CN1693757A (en) | 2005-11-09 |
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