CN1125831A - Liquid fuel burner - Google Patents
Liquid fuel burner Download PDFInfo
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- CN1125831A CN1125831A CN 94113232 CN94113232A CN1125831A CN 1125831 A CN1125831 A CN 1125831A CN 94113232 CN94113232 CN 94113232 CN 94113232 A CN94113232 A CN 94113232A CN 1125831 A CN1125831 A CN 1125831A
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Abstract
The liquid fuel burner generating long flame with bigger proportion of flame for thermal radiation effectively is composed of fuel feed tube with nozzle at its top, combustion-promoting gas feed tube concentrically surrounding the fuel feed tube, and perforated part in fuel feed tube and having a gap to its top. The holes on perforated part are eccentric to the nozzle of fuel feed tube.
Description
The present invention relates to liquid-fuel burner, more particularly, the present invention relates to be suitable for to utilize for example liquid-fuel burner of glass melting furnace of various types of stoves that flame radiation conducts heat.
In glass melting furnace,, use for example burner that in air, burns of fuel oil or kerosene of liquid fuel usually for glass is evenly heated up and heating.The melting method that is adopted in these stoves is to make the not direct and glass contact of flame, but mainly heat by radiant heat transfer.
Yet, when making combustion-supporting gas, the nitrogen contributed is not made in burning owing to contain in the air with air, make exhaust volume increase, simultaneously,, make the thermal efficiency very poor because the thermal loss that the gas of discharging can be taken away from stove also increases.And the emission level of the NOX that is produced is also very high.
Thereby consider to make combustion-supporting gas with oxygen.When making combustion-supporting gas with oxygen, owing to compare with the situation of using air, it is about 1/5 that the burning and gas-exhausting amount reduces to, and burning is discharged the heat that gas takes away and also is reduced to about 1/4-1/5.As a result, obtain the higher thermal efficiency, the amount of the NOX of generation has also significantly reduced.
Yet, use oxygen to make the flame that liquid-fuel burner produced of the routine of combustion-supporting gas, owing to use, have very big defective in the fusion mode of Fire Radiation heat transfer as main body, this point will be described in more detail below.
For example, point out in the specification that No. the 4216908th, United States Patent (USP) that the liquid fuel gas burner that use oxygen is made the prior art of combustion-supporting gas consists of the following components: have the fuel feed pipe of fuel nozzle, the combustion-supporting gas supply pipe that also is provided with one heart with it in the described fuel feed pipe outside to be close to the rotarytype injector of above-mentioned fuel nozzle and several combustion-supporting gas nozzles that around above-mentioned fuel nozzle, are connected with formation combustion-supporting gas passage, in above-mentioned fuel feed pipe inboard on the top with above-mentioned combustion-supporting gas passage.
Oxygen with by rotarytype injector with 30 degree or higher wide-angle by the liquid fuel of above-mentioned fuel nozzle with vaporific ejection, spray from above-mentioned combustion-supporting nozzle with the speed of 50-200m/s, then be the fluid combustion of ejection.
In this structure, liquid fuel acutely mixes with oxygen, and high-velocity combustion.As a result, forming the short thermal-flame of the length of flame than the high 600-800 of situation ℃ temperature using air.By this thermal-flame is directly heated, can be heated to high temperature subsequently on the object of desire heating with desiring heating object.And, produce heat when after colliding, changing into carbon dioxide and water stable material with the desire heating object owing to free radical material contained in the flame, can be heated to higher temperature with desiring heating object.
Like this, though the burner that uses oxygen to make the prior art of combustion-supporting gas is effectively for the direct heat fusion of desiring heating object,, quickened mixing of liquid fuel and oxygen from above-mentioned combustion-supporting gas nozzle because the velocity ratio that oxygen sprays is very fast.Because burning velocity is corresponding to accelerate, the length of flame shortens.In addition, because effectively the ratio of the flare of flame part is less in radiant heat transfer, be the 40-60% of the length of flame (using oil is for example situation of fuel oil or kerosene of liquid fuel), thereby when the fusion mode used it for based on the Fire Radiation heat transfer, have some problems.
Thereby, an object of the present invention is to provide a kind of liquid-fuel burner, described burner is by being no less than oxygen concentration 50% gas as combustion-supporting gas, efficiency of combustion can be increased to higher level, and described burner can obtain long flame, the major part of flame partly is made up of flare, thereby can carry out radiant heat transfer effectively, also has a benefit can reduce NOX exactly simultaneously.
Liquid-fuel burner of the present invention consists of the following components: the fuel feed pipe of fuel nozzle is arranged on the top, in the described fuel feed pipe outside and the combustion-supporting gas supply pipe that is provided with one heart with it to form the combustion-supporting gas passage and to be arranged on the hole element that there is certain intervals on the inboard top with described fuel feed pipe of above-mentioned fuel feed pipe; The hole of wherein said hole element and the fuel nozzle of above-mentioned fuel feed pipe are eccentric mutually.
In addition,, in the combustion-supporting gas passage of the above-mentioned combustion-supporting gas supply pipe of above-mentioned improved fuel gas device, a blade is set, with the combustion-supporting gas vortex according to the present invention.
In addition, in the present invention, be 1.0-4.0 by the eccentricity of the ratio decision of distance between the center line in the center line of above-mentioned fuel nozzle and above-mentioned hole and the distance on the axis direction between described fuel nozzle and the described hole.
In addition, in the present invention, it is 1-20m/ second from the spouting velocity of the combustion-supporting gas of above-mentioned combustion-supporting gas passage ejection.
And the oxygen concentration of above-mentioned combustion-supporting gas of the present invention is not less than 50%.
As mentioned above, according to liquid-fuel burner of the present invention, liquid fuel is spraying from fuel nozzle by the diffusion of the space between the top of above-mentioned hole element and above-mentioned fuel feed pipe back after the hole.At this moment, because above-mentioned hole and above-mentioned fuel nozzle are eccentric mutually, liquid fuel sprays from above-mentioned fuel nozzle with the spray angle less than prior art, thereby has increased the jet length of the liquid fuel of ejection.On the other hand, combustion-supporting gas surrounds with the liquid fuel with atomizing from the openend ejection of combustion-supporting gas passage.Because then with this state burning, it is long to have obtained the length of flame for liquid fuel, the big flame of ratio of flare part.
Liquid fuel can burn in its whole length with the liquid fuel that big distance sprays with the result of acute angle ejection from above-mentioned fuel nozzle, makes the length of flame increase.It is because in liquid-fuel burner of the present invention that the ratio of flame flare part increases, the mixing velocity of liquid fuel and combustion-supporting gas slow than in the liquid-fuel burner of the prior art of liquid fuel within all primary combustion.As a result, can think that this combustion system of liquid fuel is not too violent.By the way, if with oxygen concentration less than 50% gas for example air then be difficult to the completing combustion liquid fuel as combustion-supporting gas.Owing to imperfect combustion consequently causes producing jet-black, thereby preferably oxygen concentration is not less than 50% oxygen rich gas or high purity oxygen as mentioned above among the present invention as combustion-supporting gas.This is owing to can form flame preferably under the oxygen concentration condition with higher.
Like this, because liquid-fuel burner of the present invention can obtain having the flame of the long length of flame and vast scale flare part, for being used for melten glass and based on aforesaid situation by radiant heat transfer, the fusion effect improves, and can reduce the consumption of liquid fuel and oxygen.In addition, near the end of burner, combustion flame is thin spindle shape, makes because the thermic load of the burner end that burning causes reduces.Thereby, can cancel the water cooling chuck, and this is absolutely necessary in the liquid-fuel burner of the prior art that uses oxygen.
In addition, liquid-fuel burner of the present invention is provided with the combustion-supporting gas supply pipe that is used to form the second combustion-supporting gas passage in the above-mentioned combustion-supporting gas supply pipe outer concentric that is used to form the first combustion-supporting gas passage.
In addition, among the present invention, the flow of the combustion-supporting gas of the first combustion-supporting gas passage is 0.25-1.0 with the ratio of the flow of the combustion-supporting gas of the above-mentioned second combustion-supporting gas passage.
In addition, among the present invention, the spouting velocity of the combustion-supporting gas of the first combustion-supporting gas passage is 0.3-1.0 with the ratio of the spouting velocity of the combustion-supporting gas of the above-mentioned second combustion-supporting gas passage.
In addition, in the present invention, the spouting velocity of the combustion-supporting gas of the above-mentioned first combustion-supporting gas passage is 0 ℃ of temperature, and 1 atmospheric pressure state is down 10-40m/ second.
Liquid-fuel burner of the present invention can form longer combustion flame by in the above-mentioned combustion-supporting gas supply pipe outside that forms the first combustion-supporting gas passage combustion-supporting gas supply pipe that forms the second combustion-supporting gas passage being set with one heart with it also.And nearly all combustion flame partly forms by flare, and this has further improved, and to be used for the radiant heat transfer be the fusion effect of situations such as main body melten glass.
Fig. 1 is the major part cross-sectional view strength of the liquid-fuel burner of first embodiment of the present invention.
Fig. 2 is the major part cross-sectional view strength of second embodiment of the present invention.
Fig. 3 is the key diagram that shows experimental example 1 flame status.
Fig. 4 is the nozzle velocity of oxygen in the experimental example 2 and the graph of a relation between the flame.
Fig. 5 is the major part cross-sectional view strength of the 3rd embodiment of the present invention.
Fig. 6 is the cross section view along the VI-VI face of Fig. 5.
Fig. 7 is the burner view that places combustion furnace in the experimental example 4.
Fig. 8 be the furnace wall openend that inserts burner in the combustion furnace with the interior furnace roof of combustion furnace between distance and combustion furnace in graph of a relation between the top temperature.
Fig. 9 is the cross-sectional view strength of the major part of the 4th embodiment of the present invention.
Figure 10 is the cross-sectional view strength of the major part of the 5th embodiment of the present invention.
Below in conjunction with accompanying drawing in detail enforcement optimal mode of the present invention is described in detail.
Fig. 1 is the cross-sectional view of the liquid-fuel burner major part of first embodiment of the present invention.Liquid-fuel burner 1 consists of the following components: fuel feed pipe 4 has the fuel nozzle 3 that is connected with fuel channel 2 on its top; In the outside of described fuel feed pipe 4 and the combustion-supporting gas supply pipe 6 that is provided with one heart with it inboard and the hole element 7 of a fixed gap is arranged to form combustion-supporting gas passage 5 and to be positioned at described fuel feed pipe 4 with the top of described fuel feed pipe 4.Above-mentioned fuel nozzle 3 forms on the center line 8 of above-mentioned fuel feed pipe 4.Several for example 3 holes 9 that form in the position with above-mentioned fuel nozzle 3 off-centre are arranged in above-mentioned hole element 7.Above-mentioned three holes 9 have identical bore separately, and to be the center with above-mentioned center line 8 uniformly-spaced be provided with around it.
Space between above-mentioned hole element 7 and above-mentioned fuel feed pipe 4 ends constitutes fuel atomization portion 10.The end of above-mentioned combustion-supporting gas passage 5 is combustion-supporting gas outlets 11.
Can be with various types of liquid fuels as described liquid fuel, for example kerosene, gas and oil or fuel oil.
If with oxygen concentration less than 50% gas for example air then be difficult to the completing combustion liquid fuel as combustion-supporting gas.Owing to imperfect combustion causes producing jet-black, thereby it is desirable among the present invention oxygen concentration is not less than 50% oxygen rich gas or high purity oxygen as described combustion-supporting gas.This is owing to can form flame preferably under the oxygen concentration condition with higher.
According to above-mentioned structure, adopt known method respectively with liquid fuel and combustion-supporting gas feed path 2 and 5.Liquid fuel is by hole 9 and diffusion in atomizing portion 10.Then, it is from fuel nozzle 3 ejection, afterwards with combustion-supporting gas mixing after-combustions from combustion-supporting gas outlet 11 ejections of combustion-supporting gas passage 5.
Although can do slight modification according to the length (L) and the surface area of above-mentioned fuel nozzle 3, experimental results show that described spray angle is that the ratio in the space (S) of fuel atomization portion 10 changes according to the distance of distance (M) between the center line in the center line of above-mentioned fuel nozzle 3 and above-mentioned hole 9 and the axis direction between described fuel nozzle 3 and the described hole 9 mainly from the spray angle of the liquid fuel of above-mentioned fuel nozzle 3 ejections.In other words, M/S value (being called eccentricity) is depended in these variations.If eccentricity is less than 1.0, though the growth of fuel jet length, since insufficient from the liquid fuel diffusion (atomizing) of above-mentioned fuel nozzle 3 ejections, partially liq fuel unburned.On the other hand, if eccentricity surpasses 4.0, the liquid fuel diffusion is good.Yet the spray angle of liquid fuel increases, and causes big flame length shorter.Based on these discoveries, by eccentricity being set in the 1.0-4.0 scope, the spray angle of liquid fuel can being reduced to 5 to 10 degree, and still can obtaining sufficient diffusion simultaneously, can obtain long flame like this.
Fig. 2 is the cross-sectional view strength of the major part of second embodiment of the present invention.In the liquid-fuel burner 21 of this embodiment, the liquid-fuel burner of the fuel nozzle 23 that has only fuel feed pipe 4 and the numeral in the hole 29 of hole element 7 and position relation and above-mentioned first embodiment shown in Figure 1 is different.Other part is identical with the liquid-fuel burner of first embodiment.
Above-mentioned hole 29 is formed centrally in above-mentioned hole 7, promptly on the center line 8 of above-mentioned fuel feed pipe 4.Form several fuel nozzles 23 in position with above-mentioned hole 29 off-centre.These fuel nozzles 23 have same bore separately, and with the uniformly-spaced configuration around it that is the center of above-mentioned center line 8.
In the case, the distance that eccentricity is expressed as distance (M) between the center line in the center line of above-mentioned fuel nozzle 23 and above-mentioned hole 29 and the axis direction between described fuel nozzle 23 and the described hole 29 promptly, the ratio in the space of fuel atomization portion 10 (S), i.e. M/S.
In second embodiment,, the spray angle of liquid fuel can be reduced to 5 to 10 degree, and still can obtain sufficient diffusion simultaneously equally by eccentricity being set in the 1.0-4.0 scope.Can obtain long flame like this.
For above-mentioned eccentricity is maintained predetermined value, the situation in a fuel nozzle and a hole is set, the situation in several holes 9 is set or all can uses for a fuel nozzle 3 for the situation that several fuel nozzles 23 are provided with a hole 29.No matter which kind of situation all should make the area of section (in the occasion of using several fuel nozzles summation as area of section) of the area of section (in the summation of the occasion of using several holes as area of section) in above-mentioned hole greater than fuel nozzle.For the situation that several fuel nozzles or hole are set, be the flame that forms, preferably make them have identical bore, and be the center with center line 8, around it, uniformly-spaced be provided with.Yet, as long as eccentricity is arranged in the above-mentioned scope,, does not use same bore or fuel nozzle and hole uniformly-spaced are not provided with even other condition changes slightly, still can make the burner of the spray angle of fuel burner less than prior art.
Experimental example 1
For confirming the effect of the eccentricity between above-mentioned fuel nozzle 3 and the hole 9, under air atmosphere, burn and confirm flame profile with the liquid-fuel burner A (liquid-fuel burner of prior art) of liquid-fuel burner 1 (liquid-fuel burner of the present invention) with structure shown in Figure 1 and aforesaid prior art.Eccentricity with liquid-fuel burner 1 of the present invention is arranged on 3.0 by the way.
Kerosene is flow to as liquid fuel among the fuel channel of said burner with 50 liters/hour speed.Make oxygen (oxygen concentration: 98%) with 100Nm
3/ hour (Nm wherein
3Refer to the volume of gas under 0 ℃ of temperature and latm pressure) speed inflow combustion-supporting gas passage.By the way, because the area of section of the combustion-supporting gas passage between the liquid-fuel burner A of liquid-fuel burner 1 of the present invention and prior art is different, the spouting velocity of oxygen is 6m/ second in liquid-fuel burner 1 of the present invention, and the liquid-fuel burner A's of prior art then is 100m/ second.These the results are shown in table 1.In addition, the state of the flame of formation as shown in Figure 3.Fig. 3 (a) has shown the flame that liquid-fuel burner 1 of the present invention produces, and Fig. 3 (b) has shown the flame that the liquid-fuel burner A of prior art produces.Flame temperature records by measuring the flare portion temperature with radiation thermometer.
Table 1
| Liquid-fuel burner 1 of the present invention | The liquid-fuel burner A of prior art | |
| The length of flame (mm) flare partial-length (mm) flame temperature (℃) | ????2500 ????2500 ????2400 | ????1500 ????600 ????2700 |
Can be clear that from above-mentioned table 1 and Fig. 3 in the situation of the liquid-fuel burner A of prior art, liquid fuel is from fuel nozzle ejection atomizing, and forms flame under the support that oxygen sprays into from its outside.Mix because liquid fuel and oxygen are fierce, obtain the short flame higher than the temperature of liquid-fuel burner 1 of the present invention.Shown in table 3 (b), flare part B part forms near the burner end, it is believed that it is because the light blue non-flare portion C of the length that the gas combustion that fuel gasification forms causes then is to form near the end of described flare part B
On the other hand,, obtain the long flame of flame than the liquid-fuel burner A of prior art for the situation of liquid-fuel burner 1 of the present invention, and flare part B extension and whole flame, shown in Fig. 3 (a).
As mentioned above, according to liquid-fuel burner 1 of the present invention, obtain the radiant heat transfer desirable flame bigger than the liquid-fuel burner A of prior art, and, by being controlled in 1-20m/ scope second from the spouting velocity of the combustion-supporting gases of above-mentioned combustion-supporting gas outlet 11 ejections, especially in 2-12m/ scope second, can obtain being suitable for practical best flame.And, can be with the method for speed of various means known in the prior art as the control combustion-supporting gas, it is long-pending and in the supply pipe of combustion-supporting gas passage flow-controlling meter is being set for example to regulate the transverse section surface of combustion-supporting gas passage according to the consumption of combustion-supporting gas.
Experimental example 2
Then, be the pass bar between research oxygen spouting velocity and the flame, adopt following method to form flame: with various speed injection of oxygen, make oxygen-supplying amount keep constant simultaneously, and use have the liquid-fuel burner 1 of structure shown in Figure 1 and the different various burners of surface area of combustion-supporting gas passage 5.These the results are shown among Fig. 4.D represents the length of flame among the figure, and E represents the ratio (flare part ratio) of flare part and the length of flame.With a centimetre expression, and flare part ratio E represents with percentage on the longitudinal axis on right side length of flame D on the longitudinal axis in left side.
Can be clear that from Fig. 4, when oxygen velocity is lower than 1m/ during second, flare part ratio height, but flame is short.It is believed that this is that to such an extent as at the end of flame, the admixture of liquid fuel and oxygen is very poor, this just causes the generation of unburned composition because oxygen velocity is too low.Substantially desirable flame increases to 2m/ second or obtains when higher in the oxygen spouting velocity.On the other hand, if the spouting velocity of oxygen surpasses 12m/ second, then flare part ratio descends.Particularly, when oxygen jet speed increases to above 20m/ second high-speed, significantly do not reduce though too big variation flare part ratio does not take place the length of flame.It is believed that this is because oxygen velocity is too fast, thereby cause too promoting mixing of liquid fuel and oxygen.The result is that partially liq fuel is gasified owing to burn near the flame end, because liquid fuel burns with vaporized state, has stoped the formation of flare like this.
According to above result, for the situation of liquid-fuel burner of the present invention, consider from practical standpoint, oxygen velocity is controlled at 1-20m/ is advisable second, preferred 2-12m/ second.
Below, Fig. 5 and 6 shows the 3rd embodiment of the present invention.Fig. 5 will form the cross-sectional view strength that the pipe in the outside of combustion-supporting gas passage 5 cuts.Fig. 6 is by the view of Fig. 5 direction of arrow along the VI-VI line.
The liquid-fuel burner 31 of this embodiment disposes at above-mentioned combustion-supporting gas for managing the blade 32 that is used to make the combustion-supporting gas vortex in the combustion-supporting gas passage 5 of giving pipe 6.Other part is identical with the liquid-fuel burner 1 of first embodiment.
As shown in Figure 6, above-mentionedly be used to make the blade 32 of combustion-supporting gas vortex to form by four blade elements.These four blade elements uniformly-spaced are provided with in combustion-supporting gas passage 5, and with respect to described combustion-supporting gas passage 5 predetermined angle are arranged, and by the way, though used four blade elements in this example, can use the blade element of any amount.
Use the result of above-mentioned composition to be, the combustion-supporting gas that flows through combustion-supporting gas passage 5 is subjected to vortex power (swirling force) between by each blade element of blade 32 time, and sprays with vorticity from combustion-supporting gas spout 11.As a result, though the length of flame changes hardly, the combustion flame that generates has the flare part of high temperature, thereby has improved the radiant heat transfer effect.It is believed that this is to mix vortex around the liquid fuel that atomizes and spray from fuel nozzle 3 simultaneously with liquid fuel owing to be subjected to the combustion-supporting gas of such vortex power, thereby make and to mix aptly with liquid fuel.
Experimental example 3
Below, confirm the effect of blade 32 to make the velocity conditions of liquid fuel and combustion-supporting gas change the inclination of the blade element of blade 32 with the identical of embodiment 1 by the liquid-fuel burner that uses the 3rd embodiment for combustion-supporting gas passage 5.The inclination of above-mentioned blade element is like this definition, and inclination is 0 degree, and corresponding to the parallel state of blade element and combustion-supporting gas passage 5, inclination is 90 to spend corresponding to the vertical state of blade element and combustion-supporting gas passage 5.The result is as shown in table 2.
Table 2
| Inclination (°) | ????0 | ????20 | ????40 |
| The length of flame (mm) flare partial-length (mm) flame temperature | ????2500 ????2500 ????2400 | ????2500 ????2500 ????2450 | ????2450 ????2450 ????2500 |
Table 2 clearly illustrates that, when inclination is 0 when spending, and the burner of result and Fig. 1 identical.When inclination increases to 20 and 40 when spending, the length of flame almost all keeps identical with the flare part, and flame temperature increases.Yet when inclination rises to 45 degree or when higher, changes hardly.In the case, need to increase the supply gas pressure of oxygen, this is because blade 32 is relative with Oxygen Flow, like this, it is desirable to, and the inclination of above-mentioned blade element is arranged on 40 degree or the desired value below 40 degree according to actual service conditions.
By the way, because above-mentioned experimental example 1-3 under atmospheric pressure carries out, the end of flame is seen Fig. 3 owing to buoyancy is bent upwards.But when being used for actual stove, because furnace high-temperature makes that interior temperature of stove and flame temperature difference are less.Like this, thus buoyancy reduces to obtain the flame of basic horizontal.
Experimental example 4
Subsequently, the inclination of above-mentioned blade element is arranged on the burner of 0 degree and the burners that the inclination of above-mentioned blade element is arranged on 40 degree are placed the test combustion furnace, and measure temperature in the stove.The liquid-fuel burner A that is used in the prior art in the experimental example 1 is used for comparison.
As shown in Figure 3, the difference of flame formation state is as shown in table 3 between the burner A of the burner 31 of embodiments of the invention and prior art.Like this, for the situation of burner 31, shown in Fig. 7 (a), the outside that the configurable burner that is connected in the inboard with stove 33 in the top of burner inserts mouth 34, by comparison, in the situation of the liquid-fuel burner A of prior art, then must be inserted into burner and insert mouthfuls 34 the back side.Thereby, be fixed on the burner patch block loss that burner inserts mouthful 34 inwalls in order not make, need be at the outer rim configuration water cooling chuck of the liquid-fuel burner A of for example prior art end.By comparison, the situation of burner 31, the result who forms long and thin flame are the terminal thermic load minimizings of burner that causes owing to burning, and such advantage is not need the terminal near zone of burner is cooled off.
Fig. 8 is to use inclination to place burner F, the inclination of the 0 above-mentioned blade element of spending to place the flame of the burner A formation of 40 above-mentioned blade element burner G that spend and prior art, inserts the precalculated position mensuration top temperature of the stove openend of mouth 34 then from burner.Fig. 8 clearlys show that temperature raises according to burner A, the burner F of prior art and the order of burner G in the stove.
Fig. 9 is the cross-sectional view strength of major part of the liquid-fuel burner of four embodiment of the invention.
The liquid-fuel burner 41 of this embodiment and the 42 concentric settings of the second combustion-supporting gas supply pipe, described supply pipe 42 are then in the outside of the combustion-supporting gas supply pipe 6 of the burner of above-mentioned first embodiment.The liquid-fuel burner 1 of other part and first embodiment identical.
Thereby, between above-mentioned fuel feed pipe 4 and combustion-supporting gas supply pipe 6, form the first combustion-supporting gas passage 43, and between above-mentioned combustion-supporting gas supply pipe 6 and above-mentioned combustion-supporting gas supply pipe 42, form the second combustion-supporting gas passage 44.
Figure 10 is the cross-sectional view strength of major part of the liquid-fuel burner of fifth embodiment of the invention.
The liquid-fuel burner 51 of this embodiment and the 52 concentric settings of the second combustion-supporting gas supply pipe, described supply pipe 52 are then in the outside of the combustion-supporting gas supply pipe 6 of the burner of above-mentioned second embodiment.The liquid-fuel burner 21 of other part and second embodiment identical.
Thereby, between above-mentioned fuel feed pipe 4 and combustion-supporting gas supply pipe 6, form the first combustion-supporting gas passage 53, and between above-mentioned combustion-supporting gas supply pipe 6 and above-mentioned combustion-supporting gas supply pipe 52, form the second combustion-supporting gas passage 54.
By in the first combustion-supporting gas passage outer rim the second combustion-supporting gas passage being set as mentioned above, forming on every side from the fuel of fuel nozzle from first combustion air current of first combustion-supporting gas passage ejection, and around described first combustion air current, forming from second combustion air current of second combustion-supporting gas passage ejection with the low-angle ejection.As a result, obtain the big long flame of flare part ratio.In addition, the length of flame can recently change by flow-rate ratio and the flow velocity that changes between first combustion air current and second combustion air current.
It should be noted that the ratio that above-mentioned flow-rate ratio and velocity ratio are defined as first combustion air current and second combustion air current i.e. [first]/[second].
Provide the experimental example of the liquid-fuel burner that uses the 4th embodiment of the present invention shown in Figure 9 below.Experimental example 5
Press 70Nm by 35 liters/hour with oxygen at kerosene
3/ when hour burning in atmosphere, the combustion characteristics under the situation that changes flow is shown in table 3.By the way, be 20Nm/ second (wherein Nm refers to be converted into the value under 0 ℃ of temperature and the latm pressure, down with) in the oxygen velocity of the first combustion-supporting gas passage, one side, in the second combustion-supporting gas passage, one side is 33Nm/ second.
Table 3
| Flow-rate ratio | |||||
| ????0.11 | ?0.25 | ?0.54 | ?1.00 | ?2.33 | |
| The length of flame (mm) | The unburned part is big | ?1500 | ?1700 | ?1500 | ?1200 |
| Flare part (mm) | ??- | ?1500 | ?1700 | ?1500 | ?1200 |
| Flame temperature (max, ℃) | ????2100 | ?2400 | ?2500 | ?2550 | ?2600 |
According to above result, preferably flow-rate ratio is arranged on the scope of 0.25-1.0, more preferably from about 0.54.By the way, when using the oxygen burner of prior art under similarity condition, the length of flame is 900mm, and flare partly is 600mm, and the highest flame temperature is 2700 ℃.Experimental example 6
Place in 0.54 in the flow-rate ratio with experimental example 5, change flow velocity, combustion characteristics is as shown in table 4.In the case, first oxygen gas flow rate is 20Nm/ second.
Table 4
| The length of flame (mm) | Velocity ratio | ||||||||
| 0.1 a large amount of unburned parts | ?0.2 ?1100 | ?0.3 ?1500 | ?0.5 ?1600 | ?0.6 ?1700 | ?0.8 ?1700 | ?1.0 ?1600 | ?1.2 ?1200 | ?1.5 ?1100 | |
Continuous table 4
| Velocity ratio | |||||||||
| ????0.1 | ?0.2 | ?0.3 | ?0.5 | ?0.5 | ?0.8 | ?1.0 | ?1.2 | ?1.5 | |
| Flare part (mm) | ?1050 | ?1500 | ?1600 | ?1700 | ?1700 | ?1600 | ?1100 | ?1000 | |
| Flame temperature (℃) | ????2100 | ?2300 | ?2400 | ?2500 | ?2500 | ?2500 | ?2550 | ?2600 | ?2650 |
According to above result, preferably velocity ratio is placed in the 0.3-1.0 scope, more preferably 0.6-0.8.
Experimental example 7
Flow-rate ratio in the experimental example 5 is being placed in 0.54, and under the situation that changes first oxygen gas flow rate, combustion characteristics is as shown in table 5.By the way, second oxygen gas flow rate changes in the scope of application of the velocity ratio of the 0.3-1.0 that experimental example 6 is determined.
Table 5
| First oxygen |
5 | ?10 | ?20 | ?40 | ?50 | ?60 | ?70 |
| The second oxygen gas flow rate scope | 5-17 | ?10-33 | ?20-67 | ?40- ?133 | ?50- ?150 | ?60- ?150 | ?70- ?150 |
| The first/the second flow-rate ratio | 0.3-1 | ?0.3-1 | ?0.3-1 | ?0.3-1 | ?0.33- ???1 | ?0.4-1 | ?0.46- ???1 |
| The length of flame (mm) | 1200- 1300 | ?1450- ?1700 | ?1500- ?1700 | ?1400- ?1600 | ?1200- ?1300 | ?1100- ?1200 | ?900- ?1000 |
| Flare part (mm) | 1200- 1300 | ?1450- ?1700 | ?1500- ?1700 | ?1400- ?1600 | ?1200- ?1300 | ?1000- ?1200 | ?900- ?1000 |
| Flame temperature (℃) | 2100- 2200 | ?2400- ?2500 | ?2400- ?2550 | ?2450- ?2550 | ?2500- ?2650 | ?2600- ?2700 | ?2600- ?2700 |
* the unit of first oxygen gas flow rate and the second oxygen gas flow rate scope is Nm/ second.More preferably 10-20Nm/ second.
As mentioned above, the liquid-fuel burner of the 4th and the 5th experimental example, be provided with above-mentioned fuel atomization portion 10 and, can realize that the low-angle of liquid fuel sprays by use in the structure of the first combustion-supporting gas passage of above-mentioned atomizing portion 10 outer rims and the concentric with it second combustion-supporting gas passage.And the control by to the supply mode of combustion-supporting gas can obtain desirable combustion characteristics.That is to say that in the 0.25-1.0 scope, velocity ratio is controlled in the 0.3-1.0 scope with flow-ratio control, the first combustion-supporting gas flow velocity is controlled in 10-40Nm/ scope second.
Claims (9)
1. a liquid-fuel burner is made up of following several parts: the hole element that the fuel feed pipe of fuel nozzle is arranged on the top, the also concentric with it combustion-supporting gas supply pipe that is provided with has certain intervals with the top that forms combustion-supporting gas passage and and described fuel feed pipe inboard at above-mentioned fuel feed pipe outside described fuel feed pipe; The hole of wherein said hole element and the fuel nozzle of described fuel feed pipe are eccentric mutually.
2. the described liquid-fuel burner of claim 1 wherein is provided with blade in the combustion-supporting gas passage of described combustion-supporting gas supply pipe, so that the combustion-supporting gas vortex.
3. the described liquid-fuel burner of claim 1 is 1.0-4.0 by the eccentricity that the ratio of distance between the center line in the center line of described fuel nozzle and described hole and the distance on the axis direction between described fuel nozzle and the described hole is determined wherein.
4. the described liquid-fuel burner of claim 1, wherein the spouting velocity from the combustion-supporting gas of described combustion-supporting gas passage ejection is 1-20m/ second.
5. the described liquid-fuel burner of claim 1, the oxygen concentration of wherein said combustion-supporting gas is 50% or more.
6. the described liquid-fuel burner of claim 1, the combustion-supporting gas supply pipe that wherein is used to form the second combustion-supporting gas passage is in the outside of the described combustion-supporting gas supply pipe that is used to form the first combustion-supporting gas passage and be provided with one heart with it.
7. the described liquid-fuel burner of claim 6, wherein the flow-rate ratio of the combustion-supporting gas of the combustion-supporting gas of the first combustion-supporting gas passage and the described second combustion-supporting gas passage is 0.25-1.0.
8. the described liquid-fuel burner of claim 6, wherein the velocity ratio of the combustion-supporting gas of the combustion-supporting gas of the first combustion-supporting gas passage and the described second combustion-supporting gas passage is 0.3-1.0.
9. during value under being converted into 0 ℃ of temperature and latm atmospheric pressure of the described liquid-fuel burner of claim 6, the flow velocity of the combustion-supporting gas of the wherein said first combustion-supporting gas passage is 10-40m/ second.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94113232 CN1125831A (en) | 1994-12-31 | 1994-12-31 | Liquid fuel burner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 94113232 CN1125831A (en) | 1994-12-31 | 1994-12-31 | Liquid fuel burner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1125831A true CN1125831A (en) | 1996-07-03 |
Family
ID=5036640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 94113232 Pending CN1125831A (en) | 1994-12-31 | 1994-12-31 | Liquid fuel burner |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1125831A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101484750B (en) * | 2006-07-06 | 2010-12-08 | 乔治洛德方法研究和开发液化空气有限公司 | Method for heating a charge |
| CN105351932A (en) * | 2015-11-24 | 2016-02-24 | 西安航天源动力工程有限公司 | Oxygen-enriched combustion device of float glass kiln |
-
1994
- 1994-12-31 CN CN 94113232 patent/CN1125831A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101484750B (en) * | 2006-07-06 | 2010-12-08 | 乔治洛德方法研究和开发液化空气有限公司 | Method for heating a charge |
| CN105351932A (en) * | 2015-11-24 | 2016-02-24 | 西安航天源动力工程有限公司 | Oxygen-enriched combustion device of float glass kiln |
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