CN219368436U - High-efficient purification of sintering flue gas and chemical heat recycle system - Google Patents
High-efficient purification of sintering flue gas and chemical heat recycle system Download PDFInfo
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- CN219368436U CN219368436U CN202321536305.5U CN202321536305U CN219368436U CN 219368436 U CN219368436 U CN 219368436U CN 202321536305 U CN202321536305 U CN 202321536305U CN 219368436 U CN219368436 U CN 219368436U
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Abstract
The utility model discloses a high-efficiency purification and chemical heat recycling system for sintering flue gas, which comprises a flue gas exhaust pipeline connected with a sintering machine, an oxygen adjusting system, an air adjusting system and a gas combustion device in a gas industrial furnace, wherein the flue gas exhaust pipeline is respectively connected with a first flue gas exhaust pipeline and a second flue gas exhaust pipeline, the first flue gas exhaust pipeline is connected with a flue gas chimney of the sintering machine, the second flue gas exhaust pipeline, the oxygen adjusting system and the air adjusting system are all connected with the gas combustion device in the gas industrial furnace, the oxygen adjusting system can convey oxygen to the gas combustion device in the gas industrial furnace, and the air adjusting system can convey air to the gas combustion device in the gas industrial furnace. The high-efficiency purification and chemical heat recovery utilization system for the sintering flue gas can effectively reduce CO and VOCS in the sintering flue gas, realize emission reduction of the CO and the VOCS, save fuel unit consumption and reduce the gas cost of a gas industrial furnace.
Description
Technical Field
The utility model relates to the technical field of treatment of sintering flue gas pollutants, in particular to a high-efficiency sintering flue gas purification and chemical heat recovery and utilization system.
Background
Sintering production is one of important procedures in steel production, and according to statistics, the CO emission of the sintering procedure in the steel industry is 10000mg/Nm 3 Above, far greater than SO 2 The sum of pollutant emissions of NOx and the like, and the treatment work of the sum has become a major concern of iron and steel enterprises in the world. Most of the steel long-flow sintering processes adopt an induced draft sintering mode, and because a preheating zone is positioned in the downstream direction of heat transfer and gas flow of a combustion zone in the induced draft sintering process, a large amount of CO gas generated by fuel decomposition and gasification cannot be burnt and burned out, so that serious energy waste and environmental pollution are caused. It is estimated that if no treatment measures are taken, CO discharged into the atmosphere along with sintering flue gas in the national sintering process is converted into 1250 hundred million standard parts of blast furnace gas each year according to the concentration, and the quantity of CO discharged by one 320 flat-meter sintering machine is converted into the quantity of the blast furnace gas which is completely enough for the energy of two large-scale steel rolling heating furnaces, so that the treatment of the CO in the sintering flue gas has great practical significance for energy conservation and carbon reduction. The existing sintering high-temperature carbon monoxide-containing flue gas treatment basically comprises the following two modes, one is: flue gas, a water cooling flue, a four-stage settling chamber cooler, an air cooling jacket cooler, a crude gas booster fan, a bag-type dust remover, a purified gas booster fan, a water cooling washing tower and purified flue gas emission. When the method is used for treating sintering flue gas, the water cooling flue is used for cooling, the water cooling washing tower can be used for filtering particles of the flue gas, but the method can not achieve the removal effect when carbon monoxide formed in the flue gas is trapped, and only can achieve the removal rate of 75% -85% when the sulfur oxide is purified, so that the purification effect is poor, and the emission pollution is still large. On the premise of not affecting the quality of the sinter, the flue gas of a specific air box section (namely the low-temperature high-oxygen air box flue gas of the head of the sintering machine and the high temperature of sulfur in the tail of the sintering machine) is selectedHigh oxygen fume) is circulated back to the surface of the sintering trolley to carry out hot air sintering. In the sintering flue gas circulation technology, circulating flue gas is led out from a sintering machine bellows, sequentially passes through a dust removal system, a circulating main exhaust fan and a flue gas mixer, then enters a sealing cover, is led into a sintering material layer, and participates in the sintering process again. The CO in the flue gas of the specific bellows section only accounts for about 20% of the total sintering flue gas, and about 80% of the CO also needs to be discharged into the atmosphere. In addition, common technical measures such as steam blowing, bed perforation, gas blowing on the material surface and the like can reduce the concentration of CO in sintering flue gas to a certain extent, but can only reduce the concentration of CO from 10000mg/Nm 3 About 6000mg/Nm 3 The CO emissions remain quite large. The method of oxidizing CO in the sintering flue gas into carbon dioxide by adopting a catalytic oxidation method has the problems that the catalyst is easy to poison, the catalyst belongs to dangerous waste, the operation cost is extremely high, and the like. In addition, the sintering flue gas contains about 15% of oxygen besides a large amount of CO and VOCS gases, so that the oxygen content is low and the sintering flue gas is not easy to directly use.
Disclosure of Invention
The utility model aims to provide a high-efficiency purification and chemical heat recycling system for sintering flue gas, which can not only effectively reduce CO and VOCS in the sintering flue gas and realize emission reduction of the CO and the VOCS, but also utilize chemical heat of the CO and the VOCS to replace partial fuel gas in a fuel gas industrial kiln to heat heated materials so as to save fuel unit consumption, thereby reducing the environmental pollution of the CO and the VOCS of the sintering flue gas and simultaneously reducing the fuel gas cost of the fuel gas industrial kiln.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides a sintering flue gas high-efficient purification and chemical heat recovery utilize system, includes the exhaust gas pipeline that links to each other with the sintering machine, still includes gas combustion device in oxygen governing system, air conditioning system and the gas industrial furnace, the exhaust gas pipeline links to each other with first exhaust gas pipeline, second exhaust gas pipeline respectively, and first exhaust gas pipeline links to each other with the sintering machine chimney that discharges fume, and second exhaust gas pipeline, oxygen governing system, air conditioning system all link to each other with the gas combustion device in the gas industrial furnace, and oxygen governing system can carry oxygen to the gas combustion device in the gas industrial furnace, and air conditioning system can carry air to the gas combustion device in the gas industrial furnace.
Preferably, the first exhaust gas pipeline is connected with the sintering machine exhaust gas chimney through the first regulating valve, the oxygen regulating system comprises an oxygen regulating pipeline and an oxygen regulating valve, the air regulating system comprises an air regulating pipeline and an air regulating valve, the oxygen regulating pipeline, the air regulating pipeline and the second exhaust gas pipeline are all connected with a gas combustion device in the gas industrial furnace, the second regulating valve is arranged on the second exhaust gas pipeline, the oxygen regulating pipeline can convey oxygen to the gas combustion device in the gas industrial furnace through the oxygen regulating valve, the air regulating pipeline can convey air to the gas combustion device in the gas industrial furnace through the air regulating valve, a fan is arranged on the second exhaust gas pipeline, the gas combustion device in the gas industrial furnace is further connected with the gas conveying pipeline, and the gas conveying pipeline is provided with a gas valve group.
Preferably, the flue gas desulfurization and denitrification device is arranged on the flue gas exhaust pipeline; or the desulfurization and denitrification device is connected with a smoke exhaust pipe of a gas combustion device in the gas industrial furnace.
Preferably, the gas combustion device in the gas industrial furnace is provided with an oxygen-deficient combustion-supporting burner, and the oxygen adjusting pipeline, the air adjusting pipeline, the second smoke discharging pipeline and the gas conveying pipeline are all connected with the oxygen-deficient combustion-supporting burner.
Preferably, the oxygen-deficient combustion-supporting burner comprises a central channel, a gas channel, a sintering flue gas channel, an igniter and a burner head, wherein the gas channel is arranged in the sintering flue gas channel, the central channel is arranged in the gas channel, the central channel is connected with an oxygen adjusting pipeline, the gas channel is connected with a gas conveying pipeline, the sintering flue gas channel is connected with a second smoke discharging pipeline, a cyclone is arranged in the gas channel, the igniter is arranged on the side of the cyclone near the burner head, and the air adjusting pipeline is connected with the second smoke discharging pipeline or the oxygen adjusting pipeline.
Preferably, the oxygen-deficient combustion-supporting burner further comprises a conical flow guiding component, wherein the conical flow guiding component is arranged on the side close to the igniter of the cyclone, the tip of the conical flow guiding component is opposite to the end part of the central channel, the tip of the conical flow guiding component is positioned on the central axis of the central channel, the fuel gas output by the fuel gas conveying pipeline is guided by the cyclone to form vortex-shaped fuel gas flow, then the vortex-shaped fuel gas flow is wound to the far tip side of the conical flow guiding component under the secondary flow guiding effect of the conical flow guiding component to form fuel gas turbulence, and the oxygen or air or the mixture of the oxygen and the air output by the central channel is mixed with the vortex-shaped fuel gas flow under the flow guiding effect of the conical flow guiding component and then wound to the far tip side of the conical flow guiding component to form fuel gas and oxygen or the combustible turbulence of the mixture of the fuel gas and the air or the fuel gas and the oxygen and the air; the sintering flue gas conveyed by the sintering flue gas channel forms backflow on the distal tip side of the conical flow guide part and burns with excessive fuel in the combustible turbulence.
Preferably, the fan comprises a flue gas conveying fan and a sintering flue gas combustion-supporting fan, a flue gas dust removing device and a smoke exhaust fan are arranged on a smoke exhaust pipeline, the gas valve group comprises a quick-cutting valve, a blind plate valve and a gas flow regulating valve, and the oxygen regulating system further comprises an oxygenerator.
Preferably, the gas industrial furnace is any one of a gas heating furnace, a hot blast stove, a heat treatment furnace, a lime kiln, a pellet furnace, a boiler and a ladle baking device.
Preferably, the air conditioning pipeline is connected with the second smoke exhaust pipeline through a mixer; or the air conditioning pipeline is connected with the oxygen conditioning pipeline through the mixer.
Further preferably, the air conditioning pipeline is inserted into the second smoke exhaust pipeline, and a plurality of air dispersing holes are formed at the end part of the air conditioning pipeline.
In the technical scheme, the smoke exhaust pipeline connected with the sintering machine is divided into two parts, so that sintering smoke containing a large amount of CO can be connected with a gas combustion device in a gas industrial furnace through the second smoke exhaust pipeline. The characteristics that the sintering flue gas contains a large amount of CO and VOCS and also contains about 15% of oxygen are utilized, the combustion-supporting of the sintering flue gas in the combustion process of the fuel gas of various industrial furnaces is realized by combining the oxygen-deficient combustion-supporting burner, the CO and the VOCS contained in the sintering flue gas are eliminated by a secondary combustion-supporting fuel gas industrial furnace method, the CO emission reduction is realized, meanwhile, the chemical heat of the CO and the VOCS in the sintering flue gas replaces part of fuel gas in the combustion process of the fuel gas industrial furnace to heat and support the heated materials, and the purposes of saving the fuel gas of the industrial furnaces and reducing the environmental pollution and the fuel gas cost are achieved. The second regulating valve regulates the flow of sintering flue gas flowing through the second smoke exhaust pipeline according to the combustion capacity of a gas combustion device in the gas industrial furnace. When the air conditioning pipeline is connected with the second smoke exhaust pipeline, the air conditioning valve is adjusted according to the flow and oxygen content of the sintering smoke, so that air and the sintering smoke are mixed to achieve better combustion supporting and burning effects. Through setting the conical flow guiding component, the tip of the conical flow guiding component is opposite to the end part of the central channel, so that the fuel gas output by the fuel gas conveying pipeline is guided by the swirler to form vortex-shaped fuel gas flow, then the vortex-shaped fuel gas flow is wound to the far tip side of the conical flow guiding component to form fuel gas turbulence under the secondary flow guiding effect of the conical flow guiding component, the oxygen or air or the mixture of oxygen and air output by the central channel is mixed with the vortex-shaped fuel gas flow under the flow guiding effect of the conical flow guiding component and then the vortex-shaped fuel gas flow is wound to the far tip side of the conical flow guiding component to form fuel gas and oxygen or the combustible turbulence of the fuel gas and air or the mixture of fuel gas and oxygen and air, and the local oxygen enrichment is achieved to form a local combustion high temperature zone; the sintering flue gas conveyed by the sintering flue gas channel forms continuous self-ignition at the far tip part side of the conical flow guide component, namely an igniter, and forms a central constant high-temperature ignition source formed by excessive fuel combustion and a local combustion high-temperature area in backflow and combustible turbulence, so that the purposes of stable combustion and difficult ignition of the oxygen-deficient sintering flue gas combustion-supporting combustion device are achieved, and most or even 99% of CO and VOCS gas are removed and chemical heat energy sources are secondarily utilized.
Drawings
FIG. 1 is a schematic diagram of the high-efficiency purification and chemical heat recovery system of the sintering flue gas;
FIG. 2 is a schematic cross-sectional view of an oxygen-deficient combustion-supporting burner.
Detailed Description
The utility model is further described below with reference to the accompanying drawings:
as shown in fig. 1 and 2, the sintering flue gas high-efficiency purification and chemical heat recycling system comprises a flue gas pipeline 1, an oxygen regulating system 2, an air regulating system 3 and a gas combustion device 4 in a gas industrial furnace, wherein the flue gas pipeline 1 is respectively connected with a first flue gas pipeline 11 and a second flue gas pipeline 12, a flue gas dust removing device 5 is arranged on the flue gas pipeline 1, the flue gas dust removing device 5 can be a settling chamber or a dust removing cloth bag, the settling chamber can also be combined with the dust removing cloth bag to remove large particulate matters in sintering flue gas, the first flue gas pipeline 11 is connected with a sintering flue gas chimney 14 through a first regulating valve 13, the oxygen regulating system 2 comprises an oxygen regulating pipeline 21, an oxygen regulating valve 22 and an oxygen generator 23, the air regulating system 3 comprises an air regulating pipeline 31 and an air regulating valve 32, the oxygen adjusting pipeline 21, the air adjusting pipeline 31 and the second smoke discharging pipeline 12 are all connected with the gas combustion device 4 in the gas industrial kiln, the oxygen adjusting pipeline 21 conveys pure oxygen to the gas combustion device 4 in the gas industrial kiln through the oxygen adjusting valve 22, the air adjusting pipeline 31 conveys air to the gas combustion device 4 in the gas industrial kiln through the air adjusting valve 32, the second smoke discharging pipeline is provided with the second adjusting valve 121 for adjusting sintering smoke flowing through the second smoke discharging pipeline, and the second smoke discharging pipeline 12 is also provided with a fan so that the sintering smoke, air or oxygen can be smoothly and rapidly discharged into the gas combustion device 4 in the gas industrial kiln to realize combustion, and the gas industrial kiln is any one of a gas heating furnace, a hot blast furnace, a heat treatment furnace, a lime kiln, a pellet kiln, a boiler and a ladle baking device. The gas combustion device 4 in the gas industrial furnace is also connected with a gas conveying pipeline 41, and the gas conveying pipeline 41 is provided with a gas valve group 42. In this way, a large amount of sintering flue gas generated by the sintering machine 100 is discharged into the second smoke exhaust pipeline 12 after being dedusted by the flue gas dedusting device 5, at this time, the sintering flue gas contains about 15% of oxygen besides a large amount of CO and VOCS gas and generally has sensible heat of 120-150 ℃, according to the self process characteristics of the gas combustion device 4 in the gas industrial kiln, when the oxygen content of the sintering flue gas is low, the air regulating valve 32 can be opened and regulated to enable the outside air to be mixed with the sintering flue gas to improve the oxygen content, then the sintering flue gas mixed with air enters the gas combustion device 4 in the gas industrial kiln, and the gas conveying pipeline 41 conveys gas to the gas combustion device 4 in the gas industrial kiln. CO and VOCS gases in the sintering flue gas are combusted with fuel gas in a fuel gas combustion device 4 in a fuel gas industrial kiln to release heat, oxygen in the sintering flue gas is combured in the fuel gas combustion process, CO emission reduction is realized, simultaneously, CO chemical heat energy and waste heat in the sintering flue gas are fully utilized, the environmental pollution is greatly reduced, and simultaneously, the fuel gas consumption and the fuel gas cost are saved. When the oxygen proportioning requirement can not be met still by mixing air into sintering flue gas, pure oxygen is conveyed to the gas combustion device 4 in the gas industrial furnace through the oxygen regulating valve 22, so that the oxygen content is further improved, and the gas combustion stability is improved. In this embodiment, the gas combustion device 4 in the gas industrial kiln is provided with an oxygen-lean combustion-supporting burner 7, and the oxygen adjusting pipeline, the air adjusting pipeline, the second smoke discharging pipeline and the gas conveying pipeline are all connected with the oxygen-lean combustion-supporting burner 7. The oxygen-deficient combustion-supporting burner 7 comprises a central passage 71, a gas passage 72, a sintering flue gas passage 73, an igniter 74 and a burner head 75, wherein the gas passage 72 is arranged in the sintering flue gas passage 73, the central passage 71 is arranged in the gas passage 72, the central passage 71 is connected with the oxygen adjusting pipeline 21, the gas passage 72 is connected with the gas conveying pipeline 41, the sintering flue gas passage 73 is connected with the second smoke discharging pipeline 12, two or more cyclones 76 are arranged between the central passage 71 and the gas passage 72, the igniter 74 is arranged on the side of the cyclone 76 near the burner head 75, and the air adjusting pipeline 31 is connected with the second smoke discharging pipeline 12 or the oxygen adjusting pipeline 21. In this embodiment, the oxygen-lean combustion-supporting burner 7 further includes a conical flow guiding member 77, the conical flow guiding member 77 is disposed near the igniter 74 side of the cyclone 76, the tip 78 of the conical flow guiding member is opposite to the end of the central channel 71, and the tip of the conical flow guiding member is located on the central channel axis, so that the gas outputted by the gas conveying pipeline 41 is guided by the gas channel 72 and the cyclone 76 to form a swirl-shaped gas flow, and then winds to the distal tip side of the conical flow guiding member under the secondary guiding action of the conical flow guiding member 77, i.e. the igniter forms a gas turbulence, and the oxygen or air or the mixture of oxygen and air outputted by the central channel 71 is mixed with the swirl-shaped gas flow under the guiding action of the conical flow guiding member 77 and then winds to the distal tip side of the conical flow guiding member to form a combustible turbulence of the gas and oxygen or the mixture of the gas and air or the gas and the air, so as to achieve local oxygen enrichment and form a local combustion high temperature zone; the sintering flue gas conveyed by the sintering flue gas channel forms continuous self-ignition at the far tip part side of the conical flow guide component, namely an igniter, and forms a central constant high-temperature ignition source formed by excessive fuel combustion and a local combustion high-temperature area in backflow and combustible turbulence, so that the purposes of stable combustion and difficult ignition of the oxygen-deficient sintering flue gas combustion-supporting combustion device are achieved, and most or even 99% of CO and VOCS gas are removed and chemical heat energy sources are secondarily utilized. And the swirl-shaped gas flow speed and the air or the air-air mixture flow are mixed more uniformly, so that the gas combustion is more sufficient and stable. When the combined action of the gas combustion devices in one or even a plurality of gas industrial kilns can not completely consume sintering flue gas, the redundant sintering flue gas is discharged through the first regulating valve and the sintering machine smoke discharging chimney.
In a preferred embodiment, the air conditioning line 31 is connected to the second fume extraction line 12 via the mixer 8; or the air conditioning line 31 is connected to the oxygen conditioning line 21 via a mixer, which is not described in detail herein for the prior art. Or the air conditioning pipeline 31 is directly inserted into the second smoke exhaust pipeline 12, and a plurality of air dispersing holes (not shown in the drawing) are formed at the end part of the air conditioning pipeline 31, so that the air and the sintering flue gas are mixed more uniformly, and the combustion-supporting and combustion-supporting effects are better.
In a preferred embodiment, the high-efficiency purification and chemical heat recovery and utilization system of sintering flue gas also comprises a desulfurization and denitrification device 6, wherein the desulfurization and denitrification device can be arranged on the smoke exhaust pipeline 1 to reduce the emission of sulfur dioxide, nitrogen oxides and particulate matters in the sintering flue gas; the flue gas desulfurization and denitration treatment can also be connected with a flue gas exhaust pipe of a gas combustion device 4 in the gas industrial kiln, and the desulfurization and denitration treatment can be carried out on the generated waste gas burnt out by the gas combustion device in the gas industrial kiln so as to achieve the emission reduction of sulfur dioxide, nitrogen oxides and particulate matters.
In a preferred embodiment, the fans include a flue gas conveying fan 15 and a sintering flue gas combustion fan 16, and the sintering flue gas and air or oxygen are discharged into the combustion device 4 for more rapid circulation. Further, a smoke exhaust fan 17 is arranged on the smoke exhaust pipeline, so that the circulation speed of sintering smoke is further increased. The gas valve group 42 comprises a quick-cut valve 421, a blind plate valve 422 and a gas flow regulating valve, so that gas regulation is more sensitive, quick and safer.
In the above technical solution, a large amount of sintering flue gas generated by the sintering machine 100 is discharged into the second smoke exhaust pipeline 12 after being dedusted by the flue gas dedusting device 5, when the oxygen content of the sintering flue gas is low according to the structure and process characteristics of the gas combustion device 4 in the gas industrial furnace, the air regulating valve 32 is opened and adjusted to enable the external air to be mixed with the sintering flue gas so as to improve the oxygen content, then the air-mixed sintering flue gas enters the combustion device 4, or the oxygen regulating valve 22 is opened and adjusted, the gas output by the gas conveying pipeline 41 is guided by the gas channel 72 and the swirler 76 to form vortex-shaped gas flow, and then the vortex-shaped gas flow is wound to the far tip side of the conical flow guiding part under the secondary guiding action of the conical flow guiding part 77, namely, the igniter forms gas turbulence, and the oxygen or air or the mixture of the oxygen and the air is mixed with the vortex-shaped gas flow under the guiding action of the conical flow guiding part 77, and the combustible turbulence of the gas and the oxygen or the gas and the air mixture reaches the local oxygen-enriched air to form a local combustion high temperature zone; the sintering flue gas conveyed by the sintering flue gas channel forms continuous self-ignition at the far tip part side of the conical flow guide component, namely an igniter, and forms a central constant high-temperature ignition source formed by excessive fuel combustion and a local combustion high-temperature area in backflow and combustible turbulence, so that the purposes of stable combustion and difficult ignition of the oxygen-deficient sintering flue gas combustion-supporting combustion device are achieved, and most or even 99% of CO and VOCS gas are removed and chemical heat energy sources are secondarily utilized. And the swirl-shaped gas flow speed and the air or the air-air mixture flow are mixed more uniformly, so that the gas combustion is more sufficient and stable. When the air conditioning pipeline 31 is connected with the oxygen conditioning pipeline 21, the air conditioning valve 32 can be opened first, and the air output by the central channel 71 is fully mixed with the swirl-shaped gas flow under the guiding action of the conical guiding component 77 and then wound to the igniter for backflow to participate in combustion. When the sintering flue gas CO burnout and the gas stability can not be met by only introducing air, the oxygen content in the oxygen adjusting pipeline 21 is gradually adjusted, and the operation cost is further reduced.
The present embodiments are merely illustrative of the present utility model and are not intended to be limiting, and the technical solutions that are not substantially transformed under the present utility model are still within the scope of protection.
Claims (9)
1. The utility model provides a sintering flue gas high-efficient purification and chemical heat recovery utilize system, includes the exhaust gas pipeline that links to each other with the sintering machine, its characterized in that still includes oxygen governing system, air conditioning system and gas combustion device in the gas industry kiln, the exhaust gas pipeline links to each other with first exhaust gas pipeline, second exhaust gas pipeline respectively, first exhaust gas pipeline links to each other with the sintering machine chimney that discharges fume, second exhaust gas pipeline, oxygen governing system, air conditioning system all link to each other with gas combustion device in the gas industry kiln, oxygen governing system can carry oxygen to gas combustion device in the gas industry kiln, air conditioning system can carry air to gas combustion device in the gas industry kiln.
2. The system for efficient purification and chemical heat recovery and utilization of sintering flue gas according to claim 1, wherein the first flue gas exhaust pipeline is connected with a flue gas chimney of the sintering machine through a first regulating valve, the oxygen regulating system comprises an oxygen regulating pipeline and an oxygen regulating valve, the air regulating system comprises an air regulating pipeline and an air regulating valve, the oxygen regulating pipeline, the air regulating pipeline and a second flue gas exhaust pipeline are all connected with a gas combustion device in a gas industrial furnace, the second flue gas exhaust pipeline is provided with a second regulating valve, the oxygen regulating pipeline can convey oxygen to the gas combustion device in the gas industrial furnace through the oxygen regulating valve, the air regulating pipeline can convey air to the gas combustion device in the gas industrial furnace through the air regulating valve, a fan is arranged on the second flue gas exhaust pipeline, the gas combustion device in the gas industrial furnace is also connected with the gas conveying pipeline, and a gas valve group is arranged on the gas conveying pipeline.
3. The efficient sintering flue gas purification and chemical heat recovery system according to claim 1 or 2, further comprising a desulfurization and denitrification device, wherein the desulfurization and denitrification device is arranged on the flue gas exhaust pipeline; or the desulfurization and denitrification device is connected with a smoke exhaust pipe of a gas combustion device in the gas industrial furnace.
4. The efficient sintering flue gas purification and chemical heat recovery and utilization system according to claim 2, wherein an oxygen-deficient combustion-supporting burner is arranged on a gas combustion device in the gas industrial furnace, and the oxygen adjusting pipeline, the air adjusting pipeline, the second smoke discharging pipeline and the gas conveying pipeline are all connected with the oxygen-deficient combustion-supporting burner.
5. The efficient sintering flue gas purification and chemical heat recovery and utilization system according to claim 4, wherein the oxygen-deficient combustion-supporting burner comprises a central passage, a gas passage, a sintering flue gas passage, an igniter and a burner head, wherein the gas passage is arranged in the sintering flue gas passage, the central passage is arranged in the gas passage and is connected with an oxygen adjusting pipeline, the gas passage is connected with a gas conveying pipeline, the sintering flue gas passage is connected with a second smoke discharging pipeline, a cyclone is arranged in the gas passage, the igniter is arranged on the side of the cyclone close to the burner head, and the air adjusting pipeline is connected with the second smoke discharging pipeline or the oxygen adjusting pipeline.
6. The system for efficient purification and chemical heat recovery and utilization of sintering flue gas according to claim 5, wherein the oxygen-deficient combustion-supporting burner further comprises a conical flow guide component, the conical flow guide component is arranged on the side close to the igniter of the cyclone, the tip of the conical flow guide component is opposite to the end part of the central channel, the tip of the conical flow guide component is positioned on the central channel central axis, the fuel gas output by the fuel gas conveying pipeline is guided by the cyclone to form vortex-shaped fuel gas flow, then the vortex-shaped fuel gas flow is wound to the far tip side of the conical flow guide component under the secondary guiding action of the conical flow guide component to form fuel gas turbulence, and the oxygen or air or the mixture of oxygen and air output by the central channel is mixed with the vortex-shaped fuel gas flow under the guiding action of the conical flow guide component and then wound to the far tip side of the conical flow guide component to form combustible turbulence of fuel gas and oxygen or the mixture of fuel gas and air and oxygen and air; the sintering flue gas conveyed by the sintering flue gas channel forms backflow on the distal tip side of the conical flow guide part and burns with excessive fuel in the combustible turbulence.
7. The system for efficient purification and chemical heat recovery and utilization of sintering flue gas according to claim 2, wherein the fans comprise a flue gas conveying fan and a sintering flue gas combustion-supporting fan, a flue gas dust removal device and a flue gas exhausting fan are arranged on the flue gas exhausting pipeline, the gas valve group comprises a quick-cutting valve, a blind plate valve and a gas flow regulating valve, and the oxygen regulating system further comprises an oxygenerator.
8. The efficient purification and chemical heat recovery and utilization system for sintering flue gas according to claim 1 or 2, wherein the gas industrial furnace is any one of a gas heating furnace, a hot blast stove, a heat treatment furnace, a lime kiln, a pellet furnace, a boiler and a ladle roaster.
9. The efficient sintering flue gas purification and chemical heat recovery system according to claim 5, wherein the air conditioning pipeline is connected with the second smoke exhaust pipeline through a mixer; or the air conditioning pipeline is connected with the oxygen conditioning pipeline through the mixer.
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| CN202321536305.5U CN219368436U (en) | 2023-06-16 | 2023-06-16 | High-efficient purification of sintering flue gas and chemical heat recycle system |
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| CN202321536305.5U CN219368436U (en) | 2023-06-16 | 2023-06-16 | High-efficient purification of sintering flue gas and chemical heat recycle system |
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