CN209197444U - Roller hearth type heating furnace - Google Patents

Abstract

The utility model provides a kind of roller hearth type heating furnace, intracorporal at least two furnace roller of furnace is set to including furnace body, rotation, and the conveying device for driving each furnace roller to rotate synchronously via transmission component, wherein furnace body includes shell, set on the liner of shell inner peripheral surface, and it is formed in the burner hearth of liner, and multiple heat storage flat flame burners are installed in furnace body head clearance；Furnace roller includes the furnace roller body of inner hollow setting, the body of roll being fixedly set in furnace roller body, and the cooling duct in furnace roller body, and accommodating chamber is formed between the body of roll and furnace roller body, in being filled with thermal insulation material in accommodating chamber.Heating inner flue gas of the stove can be carried out conversion accumulation of energy, to reduce exhaust gas temperature by the energy-storage type flat flame burner being arranged at the top of furnace body by roller hearth type heating furnace described in the utility model；And by filling thermal insulation material on the body of roll, the high temperature resistance of furnace roller is improved, and then improve the using effect of roller hearth type heating furnace.

Description

Roller hearth type heating furnace

Technical field

The utility model relates to metallurgy, mechanical heating device technology area, in particular to a kind of roller hearth type heating furnaces.

Background technique

On wire rod or plate rolling production line, before steel billet enters tandem mill after roughing mill rolls, usually need Heating is carried out to steel billet and mends temperature, and furnace of this set between roughing and tandem rolling is called heating furnace, also referred to as afterburning furnace.

Steel billet to be heated is placed in furnace roller group, and is movable into and out furnace body by the rotation of furnace roller group, is applied to The furnace roller of transporting steel billet in high-temperature heater, generally use water-cooling heat-resistant steel construction, furnace roller under hot conditions and Gravitative Loads, It is easy bent, and then causes to be unable to good operation, the service life is short.

In addition, the furnace width of heating furnace is less than one meter, concurrent heating since the round billet of concurrent heating or the sectional area of slab are small The temperature difference is also less than 100 DEG C, the general roller hearth type heating furnace for using small hearth.The width of burner hearth is narrow, to limit burner Use, it is general using the common long-flame burners heating radiation formula heat exchanger that furnace body two sides are arranged in, or use self-preheating Burner adds injection to discharge fume, but all can not achieve making full use of for fume afterheat, and exhaust gas temperature is caused to be up to 400 DEG C or more, thus Cause the waste of the energy.

Utility model content

In view of this, the utility model is directed to a kind of roller hearth type heating furnace, to convert the heat of heating inner flue gas of the stove, Exhaust gas temperature is reduced, and the high temperature resistance of furnace roller can be improved.

In order to achieve the above objectives, the technical solution of the utility model is achieved in that

A kind of roller hearth type heating furnace, comprising:

Furnace body, including shell set on the liner of the shell inner peripheral surface, and are formed in the burner hearth of the liner, And multiple heat storage flat flame burners are installed in the furnace body head clearance；

Conveying mechanism is set to the burner hearth bottom including rotation and parallel and interval is set with the width direction of the furnace body At least two furnace rollers are set, and the transmission component for being connected to each furnace roller to drive each furnace roller to rotate synchronously；

The furnace roller include inner hollow setting furnace roller body, the body of roll being fixedly set in the furnace roller body, with And the cooling duct in the furnace roller body, and it is formed with accommodating chamber between the body of roll and the furnace roller body, in Thermal insulation material is filled in the accommodating chamber.

Further, the energy-storage type flat flame burner includes burner body, is formed with and is connected on Yu Suoshu burner body The burner hearth and external circulation passage, and in being additionally provided with cellular heat storage, Yu Suoshu circulation passage in the circulation passage Inside it is connected with gas pipeline and igniter.

Further, the conveying mechanism further include set on the furnace body two sides bearing block, the two of each furnace roller End through the furnace body and is respectively arranged in the corresponding bearing block.

Further, the accommodating chamber is the recessed portion for being formed in the body of roll both ends, and the filled thermal insulation materials are in each In the recessed portion, and the baffle for blocking the recessed portion is respectively equipped in the both ends of the body of roll.

Further, close to the both ends of the body of roll, the outer peripheral surface of Yu Suoshu furnace roller body is laid with by lightening casting Expect the insulating layer constituted.

Further, one end of Yu Suoshu furnace roller body is equipped with the rotary joint being connected to the cooling duct, and in institute It states and is connected with compressed part between rotary joint and the end of the furnace roller body, one end of the compressed part is sheathed on the rotation On connector, the other end is plugged in the furnace roller body.

Further, the cooling duct includes via the rotary joint and extending to the water inlet in the furnace roller body Channel, and the backwater channel for being connected to the intake tunnel and being flowed out via the compressed part and the rotary joint, and institute The water outlet of the water inlet and the backwater channel of stating intake tunnel is respectively positioned on the top of the furnace roller body axis.

Further, one end that the compressed part is plugged in the furnace roller body is formed with funnelform water return outlet, and institute The sectional area for stating water return outlet is gradually small along return water direction.

Further, the support of multiple support intake tunnels is equipped at intervals on the internal perisporium of Yu Suoshu furnace roller body Portion.

Further, the bottom of the furnace body from top to bottom successively by high-alumina brick, lightweight cob brick and heat preservation brick masonry and At the liner is laid with by the fixation of refractory fibre folded piece.

Compared with the existing technology, the utility model has the advantage that

(1) roller hearth type heating furnace described in the utility model, by the energy-storage type flat flame burner being arranged at the top of furnace body, Heating inner flue gas of the stove can be subjected to conversion accumulation of energy, to reduce exhaust gas temperature；And by filling thermal insulation material on the body of roll, improve The high temperature resistance of furnace roller, and then improve the using effect of roller hearth type heating furnace.

(2) energy-storage type flat flame burner when in use, air by circulation passage flow into, and the combustion gas in blast tube and It burns under the action of igniter, then calory burning is transmitted in burner hearth, and then be applied on steel billet, while because of burning The flue gas of generation can carry out heat absorption by the cellular storage body in circulation passage, to reduce the cigarette of outflow burner body Temperature degree.

(3) construction of bearing block is compact, and turn round it is sensitive, convenient for rotational installation of the furnace roller on furnace body.

(4) thermal insulation material is filled in the recessed portion at body of roll both ends, protection can be thermally shielded to furnace roller body, to improve furnace The structural strength of roller.

(5) insulating layer can further keep the temperature the furnace roller body close to the body of roll, and then improve the body of roll and furnace roller body company Connect the structural strength at place.

(6) by the way that compressed part is arranged between rotary joint and furnace roller body, the leakage of avoidable cooling water, and improve furnace The cooling effect of roller extends furnace roller service life to further increase the structural strength of furnace roller.

(7) inlet and outlet are respectively positioned on the top of furnace roller body axis, it is ensured that cooling water is full of furnace roller body Cavity, and then improve the cooling effect of furnace roller body.

(8) the compressed part last time mouth of a river is arranged to funnel-form, convenient for the discharge of furnace roller body sky intracavity gas, and then prevents furnace Roller body caused by uneven heating because cracking.

(9) support part is supported intake tunnel, so that the water outlet of intake tunnel extend into furnace roller body cavity depths, To improve cooling effect.

(10) composition of each section of liner is conducive to the high temperature resistant and structural stability that improve furnace body.

Detailed description of the invention

The attached drawing for constituting a part of the utility model is used to provide a further understanding of the present invention, this is practical new The illustrative embodiments and their description of type are not constituteed improper limits to the present invention for explaining the utility model.? In attached drawing:

Fig. 1 is the structural schematic diagram of roller hearth type heating furnace described in the utility model embodiment；

Fig. 2 is the A-A sectional view of Fig. 1；

Fig. 3 is the structural schematic diagram of furnace roller described in the utility model embodiment；

Fig. 4 is the B-B sectional view of Fig. 3；

Fig. 5 is the portion the C enlarged drawing of Fig. 3；

Description of symbols:

1- furnace body, 2- heat storage flat flame burner, 3- overhaul end cap, 4- furnace roller, 5- steel billet, 6- bearing block, 7- bracket, 8- Anchoring piece, 9- pressed joint, 10- ring flange, 11- rotary joint.

101- burner hearth, 102- liner, 103- shell, 104- through-hole, 105- high-alumina brick, 106- lightweight cob brick, 107- heat preservation Brick, 108- skimming gate, 109- see burner, 110- temperature-measuring port；

201- burner body, 202- heat storage, 203- igniter, 204- blast tube, 205- combustion chamber, 206- spray Burner；

401- furnace roller body, the 402- body of roll, 403- insulating layer, 404- baffle, 405- recessed portion, 406- blanking cover, 407- branch Support, 408- limited step, 409- intake tunnel, 410- backwater channel, 4101- water return outlet, 411- water inlet, 412- water outlet Mouthful.

Specific embodiment

It should be noted that in the absence of conflict, the feature in the embodiments of the present invention and embodiment can To be combined with each other.

The utility model will be described in detail below with reference to the accompanying drawings and embodiments.

The present embodiment is related to a kind of roller hearth type heating furnace, a kind of exemplary structure such as Fig. 1 and figure of the roller hearth type heating furnace Shown in 2 comprising furnace body 1 and conveying mechanism.Wherein furnace body 1 includes shell 103, is located at the liner of 103 inner peripheral surface of shell 102, and it is formed in the burner hearth 101 inside liner 102.In the present embodiment, shell 103 is tiled by refractory fibrous material, The bottom of furnace body 1 is successively formed by high-alumina brick 105, lightweight cob brick 106 and heat preservation brick masonry from top to bottom, and liner 102 is by resistance to Fiery fiber folded piece fixation is laid with, and liner 102 is connected in 103 internal perisporium of shell by anchoring piece 8.

There is multiple and furnace body 1 width direction to be arranged in parallel and at interval furnace roller 4 in 101 lower rotation of burner hearth, and in furnace 1 two sides of body are equipped with bearing block 6, and bracket 7 is equipped under bearing block 6, and the both ends of each furnace roller 4 are run through furnace body 1 and installed respectively In in corresponding bearing block 6 include rotation be set to bearing block 6 on.Furnace roller 4 includes with along the furnace roller body axially through cavity 401, it is fixedly set in the body of roll 402 at 401 middle part of furnace roller body, and be set in 401 cavity of furnace roller body to constitute to furnace roller The cooling cooling device of ontology 401.

It in the present embodiment, is additionally provided with outside furnace body 1 and is connected to each furnace roller 4, with the transmission group for driving each furnace roller 4 to rotate synchronously Part, the transmission component can be gear drive in the prior art or chain drive.Furnace body is moved into or removed for the ease of steel billet 5 1, the through-hole 104 passed through for steel billet 5 is additionally provided in the two opposite sides of furnace body 1.Steel billet 5 to be heated passes through through-hole 104, and edge The length direction of furnace body 1 is placed on the middle part of each furnace roller 4, is rotate in same direction with realizing to synchronize under the action of transmission component is driven, And then drive the movement of the position in furnace body 1 of steel billet 5.

In the present embodiment, multiple heat storage flat flame burners 2 are equipped in the head clearance of furnace body 1, heat storage flat flame burner 2 is Heat storage flat flame burner 2 in the prior art, structure include into the burner of turning shape referring to Fig. 2, heat storage flat flame burner 2 Ontology 201 is formed on burner body 201 and is connected to burner hearth 101 and external circulation passage, in turning for burner body 201 At angle be equipped with blast tube 204 and igniter 203, in order to combustion gas inflow and light.Firing device in the present embodiment For firing device in the prior art.And close to the circulation passage in the exit of blast tube 204 be fuel combustion chamber 205, and the fire end that goes out of combustion chamber 205 is arranged at shrink mouth shape, so that fuel flows again after carrying out full combustion in combustion chamber 205 Into burner hearth 101.

One end that circulation passage is connected to burner hearth 101 is bocca 206, and bocca 206 is configured to horn-like, and flame The sectional area of mouth 206 is along the gradually big setting of flame direction, so set, burned flame is in the form of annular discs to be attached to furnace roof, and can By the diameter and thickness of circulation passage in control heat storage flat flame burner 2, to meet the flow demand of 101 interior air-flow of burner hearth, And then can it is appropriate reduce furnace roof height, reduce furnace body 1 specification.

In addition, the spitfire end on burner body 201 is made of fiberboard in the present embodiment, heat-resisting quantity is good, and does not allow It easily cracks, the rest part of burner body 201 is poured by Low Cement Castable.

It is described based on structure as above, the combustion gas flowed out by blast tube 204 can be lighted by igniter 203, and fired Burn and sprayed into burner hearth 101 after carrying out full combustion in chamber 205, and then steel billet 5 is heated, the flue gas for generation of burning also via Circulation passage flows out burner hearth 101.Temperature after being flowed directly out due to flue gas is up to 400 DEG C, and there are the wastes of energy, therefore, this In embodiment, relative to bocca 206, cellular heat storage 202, the cellular heat storage are equipped in the other end of circulation passage 202 internal structures have multiple said minuscule holes passed through for other, and when the flue gas of burning passes through, heat storage 202 can be with flue gas Carry out heat exchange and then accumulation of energy；And when air flows through, when heat storage 202 and air carry out heat exchange, to reduce own temperature, And the temperature of air is improved, be conducive to power-assisted fuel gas buring.So set, the flue-gas temperature of discharge can be cooled to lower than 150 DEG C.

In the present embodiment, in order to improve the heat insulation of furnace roller body 401 Yu 402 junction of the body of roll, furnace roller body 401 is adopted It is made of 1Cr18Ni9Ti stainless steel material, and is formed with accommodating chamber on the body of roll 402, referring to Fig. 3, specific accommodating chamber is shape At the recessed portion 405 at 402 both ends of the body of roll, and thermal insulation material is filled in each recessed portion 405, and in each recessed portion 405 Opening, which is respectively welded, is fixed with baffle 404.In the present embodiment, thermal insulation material is preferably alumina silicate fibre, alumina silicate fibre tool Have that bulk density is light, high temperature resistant, thermal stability are good, the advantages that pyroconductivity is low, good flowing properties, is conducive in recessed portion 405 Filling.

In addition, especially the body of roll 402 is outer since the middle part of the body of roll 402 is contacted with steel billet 5 and furnace roller body 401 respectively It during peripheral wall is contacted with steel billet 5, is often worn out and hits, therefore, the body of roll 402 in the present embodiment is closed using high-temperature heat-resistance Golden steel Cr28Ni48W5 material is made, and can use in 1200 DEG C or more of environment for a long time, but since its density is big, because This, the length of the body of roll 402 should shorten as far as possible on the basis of guaranteeing that steel billet 5 is driven.

In the present embodiment, since furnace roller 4 works under high temperature environment, the cracking being keyed in order to prevent, in furnace roller body Limited step 408 is formed on 401 periphery wall, the bottom of one recessed portion 405 can be connected to limited step 408, and weld It is affixed in furnace roller body 401.As furnace roller body 401 and the difference of material used by the body of roll 402, corresponding high-temperature expansion Coefficient is also different, therefore, only welds to one end of the body of roll 402 with furnace roller body 401, can reserve expansion stroke, with Guarantee the connection effect between furnace roller body 401 and the body of roll 402.In addition, the steel billet 5 cylindrical for the ease of conveying, the body of roll 402 middle part is formed with the bending away from furnace roller body 401.

It is laid with close to the both ends of the body of roll 402 in the outer peripheral surface of furnace roller body 401 by lightening casting material structure in conjunction with Fig. 3 At insulating layer 403, insulating layer 403 is fixed in furnace roller body 401 by anchoring piece 8, with further to furnace roller body 401 Thermal insulation protection.The both ends of insulating layer 403 are mounted on furnace body 1 by refractory fibre folded piece.The lightening casting material high fluidity And high-strength characteristic, since casting space is narrow, vibrating head is not easy to be inserted into, when carrying out lightening casting material casting, it is only necessary to use Vibrating head, which slightly shakes, can be completed casting, without pouring defects such as hole, groove, voids and pits.

Since furnace roller 4 will not only bear the impact and vibration of steel billet 5 in the process of running, and the hull-skin temperature of furnace roller 4 1200 DEG C are chronically at, the temperature in 401 axle center of furnace roller body but only has 40-50 DEG C, and lightening casting material inside and outside exists very big Temperature gradient.Therefore, high efficiency composition additive and Ultramicro-powder are added in the present embodiment in lightening casting material, by furnace roller 4 from normal The intensity of temperature to 1200 DEG C of each temperature sections obtains the promotion of general equilibrium.

Furnace roller 4 described in the utility model can be right by filling thermal insulation material in the recessed portion 405 at 402 both ends of the body of roll Furnace roller body 401 is thermally shielded protection；And by setting insulating layer 403, guarantor further is thermally shielded to furnace roller body 401 Shield, to improve the heat insulation and structural strength of furnace roller 4.

Cooling device above-mentioned includes the cooling duct being mounted in 401 cavity of furnace roller body, is located at furnace roller body 401 One end and rotary joint 11 and compressed part being connected to cooling duct, one end of the compressed part are set on rotary joint 11, The other end is inserted into furnace roller body 401.

On specific structure, referring to Fig. 3 and Fig. 5, blanking cover 406 is installed in one end of furnace roller body 401, to furnace roller body One end of 401 cavity is blocked.Rotary joint 11 is mounted on the other end of furnace roller body 401 relative to blanking cover 406, aforementioned Compressed part be pressed joint 9, one end of rotary joint 11 is inserted into pressed joint 9, and is embedded in connection with pressed joint 9. The other end of pressed joint 9 is inserted into the cavity of furnace roller body 401, and pressed joint 9 and furnace roller body 401 are interference fitted, And it is formed with boss in the circumferential direction of pressed joint 9, multiple screws are fixed between boss and the end of furnace roller body 401. In the present embodiment, rotary joint 11 and furnace roller body 401 can be connected and sealed by the way that pressed joint 9 is arranged.And it is compressing Connector 9 is connected together with furnace roller body 401 by ring flange 10.Flanged joint and 9 dual-seal of pressed joint are arranged, thus Guarantee the leakproofness of each component connection.

Cooling duct in the present embodiment further include via rotary joint 11 and extend in 401 cavity of furnace roller body into Aquaporin-4 09, and the backwater channel 410 for being connected to intake tunnel 409 and being flowed out via rotary joint 11.Wherein, water inlet is logical Road 409 is water inlet pipe, which is inserted by rotary joint 11 and extends to 406 end of blanking cover along the axis of furnace roller body 401, And gap is formed between water inlet pipe and the internal perisporium of rotary joint 11, pressed joint 9 and furnace roller body 401.Backwater channel 410, which enclose structure by 401 internal perisporium of furnace roller body, the periphery wall of water inlet pipe, pressed joint 9 and rotary joint 11, forms, and water inlet pipe Water inlet 411 and the water outlet 412 of backwater channel 410 be respectively positioned on the top of 401 axis of furnace roller body.So set, can protect The cavity that cooling water is full of furnace roller body 401 is demonstrate,proved, and then improves the cooling effect of furnace roller body 401.

In addition, being formed with funnelform water return outlet in the end that pressed joint 9 is inserted into furnace roller body 401 continuing with Fig. 5 4101, and the sectional area of water return outlet 4101 is gradually small along return water direction, in order to the discharge of the empty intracavity gas of furnace roller body 401, And then prevent furnace roller body 401 because cracking caused by uneven heating.

In addition to this, the support portion of multiple support water inlet pipes, this implementation are equipped at intervals on the internal perisporium of furnace roller body 401 Support portion in example is support frame 407, and for structure referring to shown in Fig. 4, which includes the installation being set on water inlet pipe Ring, and three support rods set on mounting ring periphery.

Furnace roller 4 described in the present embodiment, and by the way that pressed joint 9 is arranged between rotary joint 11 and furnace roller body 401, It can avoid the leakage of cooling water, and improve the cooling effect of furnace roller 4, to further increase the structural strength of furnace roller 4, extend furnace 4 service life of roller.

In addition to this, it in order to observe the intensity of a fire in burner hearth 101, is equipped in the side of furnace body 1 and sees burner 109, be Temperature in burner hearth 101 is measured, spaced apart multiple temperature-measuring ports are equipped on the side wall of furnace body 1, with comprehensive To the temperature conditions in burner hearth 101.In addition, be additionally provided with skimming gate 108 in the bottom of furnace body 1, with to the debris in burner hearth 101 into Row cleaning, and access hole is equipped at the top of furnace body 1, and maintenance end cap 3 is installed on access hole.

Roller hearth type heating furnace described in the utility model, by the energy-storage type flat flame burner 2 being arranged at the top of furnace body 1, Heating inner flue gas of the stove can be subjected to conversion accumulation of energy, to reduce exhaust gas temperature；And by filling thermal insulation material on the body of roll 402, The high temperature resistance of furnace roller 4 is improved, and then improves the using effect of roller hearth type heating furnace.

The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this Within the spirit and principle of utility model, any modification, equivalent replacement, improvement and so on should be included in the utility model Protection scope within.

Claims (10)

1. a kind of roller hearth type heating furnace characterized by comprising

Furnace body (1), including shell (103), are set to the liner (102) of the shell (103) inner peripheral surface, and are formed in described (102) internal burner hearth (101) is served as a contrast, and multiple heat storage flat flame burners (2) are installed in the furnace body (1) head clearance；

Conveying mechanism, including rotation be set to the burner hearth (101) bottom and with the width direction of the furnace body (1) it is parallel and Every setting at least two furnace rollers (4), and the biography for being connected to each furnace roller (4) to drive each furnace roller (4) to rotate synchronously Dynamic component；

The furnace roller (4) includes the furnace roller body (401) of inner hollow setting, is fixedly set on the furnace roller body (401) The body of roll (402), and the cooling duct being set in the furnace roller body (401), and in the body of roll (402) and the furnace roller It is formed with accommodating chamber between ontology (401), is filled with thermal insulation material in Yu Suoshu accommodating chamber.

2. roller hearth type heating furnace according to claim 1, it is characterised in that: the heat storage flat flame burner (2) includes burning Mouth ontology (201) is formed with the circulation passage for being connected to the burner hearth (101) and outside on Yu Suoshu burner body (201), and In being additionally provided in the circulation passage cellular heat storage (202), be connected in Yu Suoshu circulation passage blast tube (204) and Igniter (203).

3. roller hearth type heating furnace according to claim 1, it is characterised in that: the conveying mechanism further includes being set to the furnace The both ends of the bearing block (6) of the two sides of body (1), each furnace roller (4) are run through the furnace body (1) and are respectively arranged in corresponding In the bearing block (6).

4. roller hearth type heating furnace according to claim 1, it is characterised in that: the accommodating chamber is to be formed in the body of roll (402) recessed portion (405) at both ends, the filled thermal insulation materials are interior in each recessed portion (405), and in the body of roll (402) both ends are respectively equipped with the baffle (404) for blocking the recessed portion (405).

5. roller hearth type heating furnace according to claim 1, it is characterised in that: close to the both ends of the body of roll (402), in The outer peripheral surface of the furnace roller body (401) is laid with the insulating layer (403) being made of lightening casting material.

6. roller hearth type heating furnace according to claim 1, it is characterised in that: one end of Yu Suoshu furnace roller body (401) is set There is a rotary joint (11) being connected to the cooling duct, and in the rotary joint (11) and the furnace roller body (401) Compressed part is connected between end, one end of the compressed part is sheathed on the rotary joint (11), and the other end is plugged in institute It states in furnace roller body (401).

7. roller hearth type heating furnace according to claim 6, it is characterised in that: the cooling duct includes via the rotation Connector (11) simultaneously extends to the intake tunnel (409) in the furnace roller body (401), and is connected to the intake tunnel , and the intake tunnel (409) and via the backwater channel (410) that the compressed part and the rotary joint (11) flow out (409) water outlet (412) of water inlet (411) and the backwater channel (410) is respectively positioned on the furnace roller body (401) axis Top.

8. roller hearth type heating furnace according to claim 6, it is characterised in that: Yu Suoshu compressed part is plugged in the furnace roller sheet One end of body (401) is formed with funnelform water return outlet (4101), and the sectional area of the water return outlet (4101) is along return water side To gradually small.

9. roller hearth type heating furnace according to claim 7, it is characterised in that: the internal perisporium of Yu Suoshu furnace roller body (401) On be equipped at intervals with the support portions of multiple supports intake tunnels (409).

10. roller hearth type heating furnace according to any one of claim 1 to 9, it is characterised in that: the bottom of the furnace body (1) Portion is successively formed by high-alumina brick (105), lightweight cob brick (106) and heat preservation brick masonry from top to bottom, and the liner (102) is by resistance to Fiery fiber folded piece fixation is laid with.