CN218232468U - Direct-fired converter gas diffusion ignition device based on porous medium combustion technology - Google Patents
Direct-fired converter gas diffusion ignition device based on porous medium combustion technology Download PDFInfo
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- CN218232468U CN218232468U CN202221214402.8U CN202221214402U CN218232468U CN 218232468 U CN218232468 U CN 218232468U CN 202221214402 U CN202221214402 U CN 202221214402U CN 218232468 U CN218232468 U CN 218232468U
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Abstract
The utility model belongs to the technical field of converter gas treatment equipment, and discloses a direct combustion type converter gas diffusion ignition device based on porous medium combustion technology, wherein a converter is connected with a first three-way valve through a converter gas diffusion pipeline, the first three-way valve is connected with a gas cabinet through the converter gas diffusion pipeline, and a gas component detector is arranged on the converter gas diffusion pipeline connected between the converter and the first three-way valve; the first three-way valve is connected with a first flame arrester through a converter gas diffusion pipeline, the first flame arrester is connected with the bottom of a diffusion torch through a diffusion main pipeline, and the top of the diffusion torch is provided with a stable combustion cap; the diffusing main pipeline is connected with the combustion accompanying ring pipe through a diffusing branch pipeline, the combustion accompanying ring pipe is installed at the bottom of the diffusing torch, and the combustion accompanying ring pipe is provided with a flame detector. The utility model discloses can realize still can ignite the diffused coal gas high-efficiently and cleanly under super low heat value, the super abominable operating mode to effectively prevent the function of tempering.
Description
Technical Field
The utility model belongs to the technical field of converter gas treatment facility, especially, relate to a direct combustion formula converter gas diffuses ignition based on porous medium combustion technology.
Background
At present, a large amount of converter gas is generated along with the production process of steelmaking. Due to the particularity of steel-making production, the converter gas has generation and quality discontinuity in production, namely the quality and the generation amount of the converter gas in the whole steel-making process are divided into high and low. When the converter gas quality is low and has no recovery value, and the converter gas production is greater than the gas user consumption, the low quality (CO) is required<35%) or excess gas is released into the environment. As can be seen from Table 1, in 2019, the converter gas emitted by the steel industry in China is 250 hundred million meters 3 These gases contain a large amount of toxic gas CO, and if the toxic gas CO is directly discharged into the atmosphere, serious environmental pollution, human harm and energy waste can be caused. In order to avoid the situation, the current common mode adopts the mode of diffusion ignition and coke oven gas co-combustion, namely, a co-combustion burner (or called ignition burner) is arranged, coke oven gas (or natural gas) with high calorific value is used as fuel to ignite diffused low calorific value gas, and the low calorific value gas is discharged into the environment after being combusted.
TABLE 1 overview of converter gas in iron and steel works
The existing diffusion ignition device needs to lay a special high-calorific-value gas conveying pipeline, the pipeline is complex, and instruments and meters are more. Specific defects can be summarized as: (1) The igniter has low ignition success rate, short service life and poor adaptability. The igniter widely used at present is mostly suitable for igniting high-heat-value gas, a spark plug type point discharge mode is utilized to generate a fire source, the service life is short, the energy of the fire source is small, and low-quality gas is difficult to ignite. (2) Because the existing igniter is difficult to ignite the converter gas with low calorific value, a large amount of high calorific value gas needs to be purchased or consumed for 'pilot burner' type co-combustion. Taking a certain three-pipe diffusing device as an example, each diffusing device needs to be provided with 9 ignition burners, and the amount of coke oven gas consumed by a single ignition burner is 50m 3 Perh, annual coke oven gas consumption 50X 9X 24X 365=3942000m 3 The coke oven gas is 0.8 yuan/m per year 3 The annual fuel cost is calculated to be 3153600 yuan.
Through the above analysis, the problems and defects of the prior art are as follows:
(1) The igniter has low ignition success rate, short service life and poor adaptability. The igniter widely used in the prior art is mainly suitable for igniting high-heat-value coal gas, a spark plug type point discharge mode is utilized to generate a fire source, the service life is short, the energy of the fire source is small, and low-quality coal gas is difficult to ignite.
(2) Because the igniter in the prior art is difficult to ignite the converter gas with low calorific value, a large amount of high calorific value gas needs to be purchased or consumed for 'pilot burner' type co-combustion.
SUMMERY OF THE UTILITY MODEL
To the problems existing in the prior art, the utility model provides a direct-fired converter gas diffusion ignition device based on porous medium combustion technology.
The utility model is realized in such a way that a direct-fired converter gas diffusion ignition device based on porous medium combustion technology is provided with a converter;
the converter is connected with a first three-way valve through a converter gas diffusion pipeline, the first three-way valve is connected with a gas cabinet through the converter gas diffusion pipeline, and a gas component detector is arranged on the converter gas diffusion pipeline connected between the converter and the first three-way valve;
the first three-way valve is connected with a first flame arrester through a converter gas diffusion pipeline, the first flame arrester is connected with the bottom of a diffusion torch through a diffusion main pipeline, and the top of the diffusion torch is provided with a stable combustion cap; the diffusion main pipeline is connected with a combustion accompanying ring pipe through a diffusion branch pipeline, the combustion accompanying ring pipe is arranged at the bottom of the diffusion torch, and a flame detector is arranged in the combustion accompanying ring pipe;
the diffusing main pipeline is connected with a second three-way valve through a diffusing branch pipeline, the second three-way valve is connected with the porous medium burner through a diffusing branch pipeline, and the porous medium burner is installed on the diffusing torch.
Furthermore, the front side of the stable combustion cap is of a conical tapered structure, and the rear side of the stable combustion cap is of a straight-tube structure.
Furthermore, the porous medium burners correspond to the openings on the combustion accompanying ring pipe at a certain angle, and the number of the porous medium burners is 3-12, and the porous medium burners are uniformly arranged in the circumferential direction of the diffusion torch.
Further, the porous medium burner is connected with the fan through a gas pipeline, and the second three-way valve is connected with a second flame arrester through a low-calorific-value ignition gas pipeline;
the second flame arrester is connected with a coal gas control valve through a low-heat value ignition coal gas pipeline, and the coal gas control valve is connected with an ignition coal gas tank through the low-heat value ignition coal gas pipeline.
Further, the porous medium burner has a symmetrical structure, and the cross section of the porous medium burner is square or round or in other irregular shapes.
Further, the porous medium burner is provided with an outer burner block, an ordered porous plate is arranged on the right side of the outer burner block, and a porous medium plate is arranged on the right side of the ordered porous plate; the upper side of the outer burner block is provided with a sparking electrode and a detection electrode;
an inner burner block is arranged inside the left side of the outer burner block, a premixed gas guide disc is arranged in the middle of the inner burner block, a thermocouple is arranged on the upper side of the inner burner block, and an air interface and a coal gas interface are arranged on the premixed gas guide disc.
Further, an inner cavity is formed in the outer burner block, and the inner cavity is gradually decreased in three stages; the size of the inner burner block is matched with the inner cavity of the outer burner block, and the inner burner block is of a two-stage structure.
Further, a premixed gas channel is arranged in the center of the inner burner block, the inner burner block is provided with a base, and a premixed gas guide plate is arranged on the base through 4 supports;
the premixed gas guide disc is provided with a guide cone and a baffle plate, and the bottom of the guide cone is welded on the center of the baffle plate; through holes are uniformly distributed on the ordered porous plate at intervals, the vent holes in the front half part of the ordered porous plate are straight through holes, and the diameter of the vent holes in the rear half part of the ordered porous plate is gradually increased.
Furthermore, a plurality of groups of nozzles are arranged on the combustion accompanying circular pipe, every three nozzles form one group, and each group of nozzles is provided with a first combustion accompanying circular pipe nozzle, a second combustion accompanying circular pipe nozzle and a third combustion accompanying circular pipe nozzle.
Furthermore, the angle of the first burning accompanying circular pipe nozzle faces the porous medium plate, the angle of the second burning accompanying circular pipe nozzle is vertical upwards, and the angle of the third burning accompanying circular pipe nozzle faces the outlet direction of the diffusion main pipe.
With the above technical solution and the technical problem solved, please analyze the following aspects and advantages of the technical solution to be protected of the present invention are:
first, to the technical problem that above-mentioned prior art exists and the degree of difficulty of solving this problem, combine closely the utility model discloses an in-process result and data etc. of technical scheme and the research and development that will protect, analyze in detail, deeply the utility model discloses technical problem that technical scheme how solved, some that bring after the solution problem possess creative technological effect. The specific description is as follows:
the utility model discloses porous medium burning has the function of extending combustion limit, realizing the stable burning of ultralow calorific value gas greatly, is applied to high altitude coal gas with it and diffuses ignition and has the function that stability is good, the adaptation adverse circumstances ability is strong, save high calorific value coal gas, helps "energy saving and consumption reduction" of iron and steel enterprise. The utility model discloses the porous medium nozzle does not have the flame that exposes in the environment, and its itself is equivalent to a heat accumulator, even coal gas short-time disconnected confession, the coal gas that back is infested also can realize the burning under porous medium high temperature effect, and this type nozzle has natural advantage in the aspect of stability. The utility model discloses the mounting means of porous medium nozzle and the nozzle structural style that accompanies on the burning ring canal ensure that the device has great area of igniting, can quickly and effectually ignite and diffuse coal gas, and the effect of igniting is superior to current any nozzle of igniting. The utility model discloses a diffuse the direct combustion of coal gas, need not to set up the catalyst that the price is expensive and inactivate easily again, the investment income is than good, and the running cost is low. To sum up, the utility model discloses porous medium burning has the function that extends combustion limit, realizes the stable burning of ultralow calorific value gas greatly, is applied to high altitude coal gas diffusion ignition with it and has the function that stability is good, the adaptation adverse circumstances ability is strong, save high calorific value coal gas, helps iron and steel enterprise "energy saving and consumption reduction". The utility model discloses have better industrial application and worth, safe efficient has realized the direct combustion of diffusing coal gas, and the small investment, the investment income is than good, and the running cost is low.
Table 2 is the experimental results for the ultra low combustion strength of the porous media burner portion of the dual layer ceramic foam construction, and it can be seen that the highest temperature of the porous media face plate at the ultra low combustion strength is sufficient to ignite the bleed air, which provides data support for the industrial application of the bleed ignition device proposed by this project.
TABLE 2 double-layer structural stable combustion condition combination
The temperature uniformity of the plate surface is an important factor in the industrial application of the combustion device, and the service life of the combustion device is seriously shortened due to the overlarge temperature difference of the plate surface. In order to examine the temperature uniformity of the plate surface, gas with a heat value of 2652kJ/m & lt 3 & gt is prepared according to the components of blast furnace gas, a verification experiment is carried out, a relatively severe experimental working condition (the combustion intensity is 370 kW/m & lt 2 & gt, and the air excess coefficient is 2.5) is adopted, three times of measurement (a K-type thermocouple and three sampling points) are carried out on the surface of the porous medium by adopting a thermocouple, and the data are shown in a table 3. It can be seen that it is entirely possible to achieve stable combustion of the low calorific value gas and efficient ignition of the bleed gas of the co-firing bustle pipe.
TABLE 3 porous medium panel temperature under low calorific value gas conditions
| Sampling point | 1 | 2 | 3 |
| First measurement (. Degree. C.) | 1040 | 970 | 1060 |
| To secondary measurement (. Degree. C.) | 1032 | 961 | 1055 |
| Third measurement (. Degree. C.) | 850 | 882 | 1000 |
Second, regard as a whole or from the angle of product to technical scheme, the utility model discloses technical effect and advantage that technical scheme that will protect possesses, the concrete description is as follows:
the utility model discloses porous medium combustion technology has combustion efficiency height, clean pollution-free, combustion stability is good, is showing and widens advantages such as lean limit as a novel unique combustion technology, and be given full attention to in all circles, is honored as the combustion technology of "the most development future of 21 century" by international combustion. The porous medium combustion technology is applied to the high-altitude gas diffusion ignition device, so that the advantages of good stability, strong capability of adapting to severe environment and saving high-calorific-value gas can be obtained, and the energy conservation and consumption reduction of iron and steel enterprises are facilitated. The utility model discloses can realize still can ignite the diffused coal gas high-efficiently and cleanly under super low heat value, the super abominable operating mode to effectively prevent the function of tempering.
Drawings
FIG. 1 is a schematic structural diagram of a direct-fired converter gas diffusion ignition device based on porous medium combustion technology according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a porous medium burner provided in an embodiment of the present invention;
fig. 3 is a schematic structural view of a premixed gas guiding plate provided by an embodiment of the present invention;
in the figure: figure a, front view; drawing b, a guide cone;
fig. 4 is a schematic diagram of an ordered porous plate structure provided in an embodiment of the present invention;
in the figure: figure a, front view; FIG. b isbase:Sub>A sectional view taken along line A-A;
FIG. 5 is a schematic structural view of a combustion accompanying ring pipe and a porous medium burner provided by the embodiment of the present invention;
in the figure: 1. a stable combustion cap; 2. releasing the torch; 3. co-firing a ring pipe; 4. a first flame arrestor; 5. a converter; 6. A gas component detector; 7. a first three-way valve; 8. a gas cabinet; 9. igniting a gas tank; 10. a gas control valve; 11. a second flame arrestor; 12. a fan; 13. a second three-way valve; 14. a porous medium burner; 15. A thermocouple; 16. an air interface; 17. a gas interface; 18. an inner burner block; 19. an outer burner block; 20. a premix air deflection disc; 21. an ordered porous plate; 22. a porous dielectric slab; 23. a sparking electrode; 24. A detection electrode; 25. a first co-firing annular tube nozzle; 26. a second co-firing annular tube nozzle; 27. a third co-fired annular tube nozzle.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
1. The embodiments are explained. This section is an explanatory embodiment for expanding the technical solutions of the claims so as to make those skilled in the art fully understand how to implement the present invention.
As shown in fig. 1, the embodiment of the present invention provides a direct combustion type converter gas diffusion ignition device based on porous medium combustion technology, which is provided with a converter 5, wherein the converter 5 is connected with a first three-way valve 7 through a converter gas diffusion pipeline, and the first three-way valve 7 is connected with a gas holder 8 through a converter gas diffusion pipeline. A gas component detector 6 is arranged on a converter gas diffusion pipeline connected between the converter 5 and the first three-way valve 7. The first three-way valve 7 is connected with the first flame arrester 4 through a converter gas diffusion pipeline, the first flame arrester 4 is connected with the bottom of the diffusion torch 2 through a diffusion main pipeline, and the top of the diffusion torch 2 is provided with a stable combustion cap 1; the front side of the combustion stabilizing cap 1 is of a conical reducing structure, and the rear side of the combustion stabilizing cap 1 is of a straight cylinder structure. The main diffusing pipeline is connected with the co-firing ring pipe 3 through a diffusing branch pipeline, the co-firing ring pipe 3 is installed at the bottom of the diffusing torch 2, and the co-firing ring pipe 3 is provided with a flame detector.
The diffusing main pipeline is connected with a second three-way valve 13 through a diffusing branch pipeline, the second three-way valve 13 is connected with a porous medium burner 14 through a diffusing branch pipeline, the porous medium burner 14 is installed on a diffusing torch 2, the porous medium burner 14 corresponds to an opening in a burning accompanying ring pipe at a certain angle, the number of the porous medium burners 14 is 3-12, the porous medium burners are evenly arranged in the circumferential direction of the diffusing torch 2, and the porous medium burners 14 are connected with a fan 12 through a gas pipeline. The second three-way valve 13 is connected with the second flame arrester 11 through a low-heat value ignition gas pipeline, the second flame arrester 11 is connected with the coal gas control valve 10 through a low-heat value ignition gas pipeline, and the coal gas control valve 10 is connected with the ignition gas tank 9 through a low-heat value ignition gas pipeline.
Converter gas diffusion pipeline: the device is used for guiding converter gas which does not meet the recovery standard to the porous medium burner 14, the combustion accompanying ring pipe 3 of the diffusion torch 2 and the diffusion torch 2 for combustion. And a plurality of flame arresters are arranged on the pipeline and are interlocked with the nitrogen purging system. Based on the determination of the CO content of the gas, the converter gas is conveyed to different removal positions through the converter gas diffusing pipeline, so that the consumption of the CO-combustion gas can be greatly reduced, and the converter gas can be more efficiently treated. Low calorific value ignition gas pipeline: when the CO content in the diffused coal gas is lower than 20 percent (the heat value is lower than 550kcal/Nm < 3 >), the low-heat-value ignition coal gas enters the porous medium burner 14 to serve as the ignition coal gas. The low-heat value gas can be blast furnace gas, gas in the gas holder 8 or mixed gas, the heat value is not less than 550kcal/Nm < 3 >, valuable high-heat value gas can be saved, and the application range of the low-heat value gas is expanded. Porous medium burner 14: the ignition burner is used for igniting low-heat value gas, igniting the diffused gas of the combustion accompanying ring pipe 3, further igniting the gas of the diffusion main pipe, ensuring that the diffused gas can be combusted at any concentration and then discharged into the environment, and realizing zero emission of CO in the diffused gas. According to the pressure of the gas source, a Venturi injection structure can be adopted to inject combustion-supporting air, and a special fan 12 can be arranged to provide combustion-supporting air. The porous medium burner 14 is arranged on the diffusion torch and corresponds to the opening on the co-combustion ring pipe at a certain angle, so that the co-combustion ring pipe can be effectively ignited. 3-12 porous medium burners 14 are uniformly arranged in the circumferential direction of each diffusion torch 2. And (3) diffusing a torch 2: the ignition device is used for igniting the converter gas of the diffusion main pipe to ensure that the converter gas is discharged into the environment after being combusted. The diffusion torch 2 is provided with the combustion accompanying ring pipe 3, the holes in the combustion accompanying ring pipe 3 are in three forms, coal gas can be effectively ignited by the porous medium burner, and the combustion accompanying ring pipe is provided with the flame detector. The stable combustion cap 1: the front side is a conical gradually-reducing structure, and the rear side is a straight-tube structure, so that the wind and rain can be prevented, and the weather can be adapt to severe weather.
As shown in fig. 2, the porous medium burner 14 provided by the embodiment of the present invention has a symmetrical structure, and the cross-sectional shape thereof may be square, circular, or other irregular shapes. The porous medium burner 14 is provided with an outer burner block 19, the right side of the outer burner block 19 is provided with an ordered porous plate 21, and the right side of the ordered porous plate 21 is provided with a porous medium plate 22; the upper side of the outer burner block 19 is provided with a firing electrode 23 and a detection electrode 24. An inner burner block 18 is arranged inside the left side of the outer burner block 19, a premixed gas guide plate 20 is arranged in the middle of the inner burner block 18, and a thermocouple 15 is arranged on the upper side of the inner burner block 18. The premixing air guide plate 20 is provided with an air connector 16 and a gas connector 17.
An inner cavity is arranged in the outer burner block 19, and the inner cavity is decreased in three stages; the inner burner block 18 is matched with the inner cavity of the outer burner block 19 in size and is of a two-stage structure. The center of the inner burner block 18 is provided with a premixed gas channel, the inner burner block 18 is provided with a base, and a premixed gas guiding disc 20 is arranged on the base through 4 supports. The premixed gas flow guiding disc 20 is provided with a flow guiding cone and a baffle plate, and the bottom of the flow guiding cone is welded on the center of the baffle plate. Through holes are uniformly distributed on the ordered porous plate 21 at intervals, the vent holes in the front half part of the ordered porous plate 21 are straight-through holes, and the diameter of the vent holes in the rear half part is gradually increased.
The outer burner block 19 is composed of a light refractory castable and a shell, and the inner cavity of the outer burner block 19 is decreased in three levels so as to facilitate the installation and disassembly of the porous medium plate 22, the ordered porous plate 21, the premixed gas guiding disc 20 and the inner burner block 18. The inner burner block 18 is composed of a light high-strength casting material and a shell, the shell and the casting material are fixed through anchoring nails, the size of the shell is matched with the inner cavity of the outer burner block 19, and the shell is of a two-stage structure. The center of the inner burner block 18 is a premix air channel, and 4 supports are arranged on the base for mounting a premix air deflector 20. The premixed gas guiding plate 20 is composed of a guiding cone and a baffle plate, and the bottom of the guiding cone is welded on the center of the baffle plate. The main function of the device is to guide the premixed gas to be uniformly distributed in the whole cavity channel, avoid the concentrated distribution, ensure that the combustion flame is distributed in the whole porous medium and the temperature of the flame is uniform. The ordered porous plate 21 is a light high-strength casting plate with a series of through holes uniformly distributed at intervals. The front half part of the vent hole is a straight-through hole, and the diameter of the rear half part of the vent hole is gradually increased. Therefore, the uniform distribution of the mixer entering the small-aperture porous medium is ensured, and the tempering after the small-aperture porous medium is damaged can be effectively avoided. The thermocouple 15 is used for monitoring the temperature of the ordered porous plate, judging whether the combustor normally operates or not and avoiding tempering. For medium-high temperature combustion, under the condition of abnormal operation, the small-hole foamed ceramics in the preheating zone are damaged, the flame front moves upstream, the porous medium plate 22 heats the ordered porous plate 21 by conducting heat and radiating heat to the ordered porous plate 21, and at the moment, the temperature monitored by the thermocouple 15 is obviously increased.
Aiming at the defects of low ignition success rate, short service life, poor stability and the like of the igniter, the Yagebu elevator arcing principle is applied to the high-altitude igniter of the torch ignition system, the principle can generate a planar electric arc, and the electric arc gradually moves upwards after being generated, so that a high-energy ignition source is generated, the electrode electroerosion can be avoided, and the stable and efficient ignition is realized. The basic principle of elegance check cloth elevator arcing is as follows: if the electric field between two electrodes reaches the breakdown field of air, the air between two electrodes will be broken down and large-scale discharge will be generated to form arc discharge of gas and generate magnetic field to make the arc move upwards. The two poles of the elegance-grid-cloth elevator form a trapezoid, and the distance between the lower ends is small, so that the field is strong. The air at the lower end of the tube is first broken down to discharge. Because of arc heating (the air is more easily ionized due to the rising temperature of the air, the breakdown field intensity is reduced), the air on the upper part is also broken down to form continuous discharge, and the arc light area gradually moves upwards to form a ladder-shaped surface arc.
As shown in fig. 5, a plurality of sets of nozzles are arranged on the combustion accompanying circular pipe 3, each three nozzles are a set, and each set of nozzles is provided with a first combustion accompanying circular pipe nozzle 25, a second combustion accompanying circular pipe nozzle 26 and a third combustion accompanying circular pipe nozzle 27; the angle of the first co-firing ring pipe nozzle 25 is opposite to the porous medium plate, the angle of the second co-firing ring pipe nozzle 26 is vertical upward, and the angle of the third co-firing ring pipe nozzle 27 faces the outlet direction of the main diffusing pipe.
The 2 structures of the diffusion torch are relatively simple, the main difference with the traditional diffusion torch is that the installation angle of the porous medium burner and the angle of the nozzle on the combustion accompanying ring pipe are arranged, because the ignition burner is in flame combustion, the flame is exposed in the environment and has a certain length, and the outlet direction of the nozzle of the traditional diffusion torch is totally directed to the diffusion main pipe. The porous medium burner nozzle is in flameless combustion, flame is immersed in the porous medium, the burner nozzle brick and the porous medium have good protection and maintenance effects on the flame in the flameless combustion mode, and the porous medium burner nozzle has the advantages of being natural in wind and rain prevention and adapting to severe environments. The nozzle on the co-combustion ring pipe 3 has three angles because the porous medium burner nozzle is not exposed to flame in the environment and the high-temperature porous medium plate is used for igniting diffused gas. The first flame-tracing annular pipe nozzle 25 is angled towards the porous medium plate, the second flame-tracing annular pipe nozzle 26 is angled vertically upwards, and the third flame-tracing annular pipe nozzle 27 is angled towards the outlet direction of the main diffuser pipe. Every three nozzles are in one group, and a plurality of groups of nozzles are arranged on the combustion accompanying ring pipe 3. Because the area of the porous medium plate is large, compared with the traditional flame, the area of the porous medium plate is large, the arrangement can effectively ignite the coal gas of the co-combustion ring pipe, and further ignite the coal gas of the diffusion main pipe.
The utility model discloses a theory of operation does: after the converter gas from the converter 5 is processed, the converter gas is detected by a gas component detector 6 and enters a gas tank 8 through a first three-way valve 7 if the converter gas meets the recovery standard. If the recovery standard is not met, the first three-way valve 7 switches the direction to enable the converter gas to enter the diffusion ignition device; two branches are arranged on the diffusion pipeline, one branch introduces coal gas into a co-firing ring pipe 3 on the diffusion torch 2, and the other branch introduces coal gas into a porous medium burner 14. And a second three-way valve 13 of a branch of the porous medium burner 14 is interlocked with the detection of gas components, if the CO content in the gas is higher than 20%, the second three-way valve 13 cuts off a low-calorific-value ignition gas pipeline, the converter gas is directly introduced into the porous medium burner 14 to be combusted, the porous medium burner 14 is used as an ignition burner to ignite the converter gas in the CO-combustion ring pipe 3, the gas in a diffusion pipeline is ignited, and the gas is discharged into the environment after being combusted. If the CO content in the coal gas is lower than 20 percent (the heat value is lower than 550kcal/Nm < 3 >), the converter coal gas of the branch is cut off by the second three-way valve 13, a low heat value ignition coal gas pipeline is opened, the low heat value ignition coal gas is introduced into the porous medium burner 14 to be combusted, the porous medium burner 14 serves as an ignition burner to ignite the converter coal gas in the CO-combustion ring pipe 3, then the coal gas in the main diffusion pipeline is ignited, and the coal gas is discharged into the environment after being combusted.
2. Application examples. In order to prove the creativity and the technical value of the technical scheme of the invention, the part is the application example of the technical scheme of the claims on specific products or related technologies.
From the economic benefit, the estimated single-tube diffusing device is not higher than 30 ten thousand yuan. Taking 120t converter releasing devices as an example, taking three-pipe converter releasing devices as an example, each releasing device needs to be provided with 9 ignition burners, the gas consumption of a coke oven by a single ignition burner is 50m3/h, the gas consumption of the coke oven per year is 50 × 9 × 24 × 365=3942000m 3/year, the coke oven gas is calculated according to 0.8 yuan/m 3, and the annual fuel cost is as high as 3153600 yuan. After the device is adopted, the coke oven gas cost is saved by 315.36 ten thousand yuan each year. Annual CO 2 Emission reduction is 5.3 ten thousand tons, and the trading value of the carbon emission index is 191 ten thousand yuan (calculated according to the trading price of carbon of 36 yuan/ton). Namely: the technology can realize energy conservation and emission reduction, and is an important source for enterprise revenue generation.
From social benefit, the technology can save fuel by about 6.75 hundred million m in the expected year after popularization and application in steel enterprises in China 3 Direct CO 2 3.4 million tons of emission reduction and 133 million yuan of economic benefit.
3. Evidence of the relevant effects of the examples. The embodiment of the utility model provides an in research and development or use some positive effects have been got, compare with prior art and do possess very big advantage, following content describes in combination test process's data, chart etc..
In order to verify the effect of the invention, a single burner platform and a small heating furnace experiment platform are built. Table 3 shows the thermal state test data of the burner on the single experiment platform, a flue gas analyzer (TESTO 350) is adopted to measure the components of the flue gas, and a thermal infrared imager (Fluke TiX 660) is adopted to measure the temperature of the porous medium panel. As can be seen from the experimental data, the NOx emission of the burner is generally lower than 20PPM and the CO emission is generally lower than 100PPM in terms of pollutant emission.
TABLE 3 test data of experimental part of this burner
Table 4 is the experimental results for the ultra low combustion strength of the porous media burner portion of the dual layer ceramic foam construction, and it can be seen that the highest temperature of the porous media face plate at the ultra low combustion strength is sufficient to ignite the bleed air, which provides data support for the industrial application of the bleed ignition device proposed by this project.
TABLE 4 double-layer structural stable combustion condition combination
The temperature uniformity of the plate surface is an important factor in the industrial application of the combustion device, and the service life of the combustion device is seriously shortened due to the overlarge temperature difference of the plate surface. In order to examine the temperature uniformity of the plate surface, 2652kJ/m of heat value is prepared according to the components of the blast furnace gas 3 The gas is subjected to verification experiments, and relatively severe experimental working conditions (the combustion intensity is 370 kW/m) 2 Air excess coefficient 2.5), three measurements were made with a thermocouple on the porous media surface (type K thermocouple, three sampling points), and the data are shown in table 5. It can be seen that it is entirely possible to achieve stable combustion of the low calorific value gas and efficient ignition of the bleed gas in the co-firing loop.
TABLE 5 porous medium panel temperature under low calorific value gas conditions
| Sampling point | 1 | 2 | 3 |
| First measurement (. Degree. C.) | 1040 | 970 | 1060 |
| To a second measurement (. Degree. C.) | 1032 | 961 | 1055 |
| Third measurement (. Degree. C.) | 850 | 882 | 1000 |
In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The above description is only for the specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be covered within the protection scope of the present invention by those skilled in the art within the technical scope of the present invention.
Claims (10)
1. A direct-fired converter gas diffusion ignition device based on porous medium combustion technology is characterized by comprising the following components in parts by weight:
a converter;
the converter is connected with a first three-way valve through a converter gas diffusion pipeline, the first three-way valve is connected with a gas tank through a converter gas diffusion pipeline, and a gas component detector is arranged on the converter gas diffusion pipeline connected between the converter and the first three-way valve;
the first three-way valve is connected with a first flame arrester through a converter gas diffusion pipeline, the first flame arrester is connected with the bottom of a diffusion torch through a diffusion main pipeline, and a stable combustion cap is mounted at the top of the diffusion torch; the diffusion main pipeline is connected with a combustion accompanying ring pipe through a diffusion branch pipeline, the combustion accompanying ring pipe is arranged at the bottom of the diffusion torch, and a flame detector is arranged in the combustion accompanying ring pipe;
the diffusing main pipeline is connected with a second three-way valve through a diffusing branch pipeline, the second three-way valve is connected with the porous medium burner through a diffusing branch pipeline, and the porous medium burner is installed on the diffusing torch.
2. The direct-combustion type converter gas diffusion ignition device based on the porous medium combustion technology as claimed in claim 1, wherein the front side of the combustion stabilizing cap is of a tapered structure, and the rear side of the combustion stabilizing cap is of a straight tube structure.
3. The direct-fired converter gas diffusion ignition device based on porous medium combustion technology of claim 1, characterized in that the porous medium burners correspond to the openings on the co-firing ring pipe at a certain angle, and the number of the porous medium burners is 3, and the porous medium burners are uniformly arranged in the circumferential direction of the diffusion torch.
4. The direct-fired converter gas diffusion ignition device based on porous medium combustion technology as claimed in claim 1, wherein the porous medium burner is connected with the fan through a gas pipeline, and the second three-way valve is connected with the second flame arrester through a low calorific value ignition gas pipeline;
the second flame arrester is connected with a coal gas control valve through a low-heat value ignition coal gas pipeline, and the coal gas control valve is connected with an ignition coal gas tank through the low-heat value ignition coal gas pipeline.
5. The direct-fired converter gas diffusion ignition device based on porous medium combustion technology of claim 1, characterized in that the porous medium burner has a symmetrical structure and a square or circular cross-sectional shape.
6. The direct-fired converter gas diffusion ignition device based on porous medium combustion technology as claimed in claim 1, wherein the porous medium burner is provided with an outer burner block, an ordered porous plate is installed on the right side of the outer burner block, and a porous medium plate is installed on the right side of the ordered porous plate; the upper side of the outer burner block is provided with a sparking electrode and a detection electrode;
an inner burner block is arranged inside the left side of the outer burner block, a premixed gas guide disc is arranged in the middle of the inner burner block, a thermocouple is arranged on the upper side of the inner burner block, and an air interface and a coal gas interface are arranged on the premixed gas guide disc.
7. The direct-combustion type converter gas diffusion ignition device based on porous medium combustion technology as claimed in claim 6, wherein an inner cavity is arranged inside the outer burner block, and the inner cavity is gradually decreased in multiple stages; the size of the inner burner block is matched with the inner cavity of the outer burner block, and the inner burner block is of a two-stage structure.
8. The direct combustion type converter gas diffusion ignition device based on porous medium combustion technology as claimed in claim 6, wherein a premixed gas channel is arranged at the center of the inner burner block, the inner burner block is provided with a base, and a premixed gas guiding plate is arranged on the base through 4 supports;
the premixed gas guide disc is provided with a guide cone and a baffle plate, and the bottom of the guide cone is welded on the center of the baffle plate; through holes are uniformly distributed on the ordered porous plate at intervals, the air holes in the front half part of the ordered porous plate are straight through holes, and the diameter of the air holes in the rear half part of the ordered porous plate is gradually increased.
9. The direct-fired converter gas diffusion ignition device based on porous medium combustion technology as claimed in claim 1, wherein the flame-accompanying ring pipe is provided with a plurality of sets of nozzles, each set of three nozzles is provided with a first flame-accompanying ring pipe nozzle, a second flame-accompanying ring pipe nozzle and a third flame-accompanying ring pipe nozzle.
10. The direct-fired converter gas bleeding ignition device according to claim 9, wherein the first combustion partner bustle pipe nozzle is angled to face the porous medium plate, the second combustion partner bustle pipe nozzle is angled vertically upward, and the third combustion partner bustle pipe nozzle is angled toward the outlet of the main bleeding pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221214402.8U CN218232468U (en) | 2022-05-20 | 2022-05-20 | Direct-fired converter gas diffusion ignition device based on porous medium combustion technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221214402.8U CN218232468U (en) | 2022-05-20 | 2022-05-20 | Direct-fired converter gas diffusion ignition device based on porous medium combustion technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218232468U true CN218232468U (en) | 2023-01-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221214402.8U Active CN218232468U (en) | 2022-05-20 | 2022-05-20 | Direct-fired converter gas diffusion ignition device based on porous medium combustion technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218232468U (en) |
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- 2022-05-20 CN CN202221214402.8U patent/CN218232468U/en active Active
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