CN117848076A - Method capable of realizing zero emission and utilization of flue gas of hot blast stove - Google Patents
Method capable of realizing zero emission and utilization of flue gas of hot blast stove Download PDFInfo
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- CN117848076A CN117848076A CN202410021991.5A CN202410021991A CN117848076A CN 117848076 A CN117848076 A CN 117848076A CN 202410021991 A CN202410021991 A CN 202410021991A CN 117848076 A CN117848076 A CN 117848076A
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- flue gas
- gas
- flue
- blast furnace
- hot blast
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 239000003546 flue gas Substances 0.000 title claims abstract description 120
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000007789 gas Substances 0.000 claims abstract description 82
- 238000002485 combustion reaction Methods 0.000 claims abstract description 34
- 230000001502 supplementing effect Effects 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 3
- 230000001105 regulatory effect Effects 0.000 claims description 35
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 26
- 239000000428 dust Substances 0.000 claims description 23
- 229910052760 oxygen Inorganic materials 0.000 claims description 23
- 239000001301 oxygen Substances 0.000 claims description 23
- 238000007664 blowing Methods 0.000 claims description 12
- 239000000446 fuel Substances 0.000 claims description 11
- 230000004907 flux Effects 0.000 claims description 10
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 9
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 9
- 230000005484 gravity Effects 0.000 claims description 7
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 230000000630 rising effect Effects 0.000 claims description 7
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 239000013589 supplement Substances 0.000 claims description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 claims description 3
- 239000001569 carbon dioxide Substances 0.000 claims description 3
- 239000003034 coal gas Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 239000002737 fuel gas Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 239000002817 coal dust Substances 0.000 description 2
- 239000005431 greenhouse gas Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 241000282414 Homo sapiens Species 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 241000700605 Viruses Species 0.000 description 1
- 238000003916 acid precipitation Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005453 pelletization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B9/00—Stoves for heating the blast in blast furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D19/00—Arrangements of controlling devices
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a method capable of realizing zero emission and utilization of flue gas of a hot blast stove, which can effectively solve the problem of CO 2 The method is simple and easy to implement, novel and unique, is easy to implement, eliminates the pollution of the exhaust gas of the blast furnace to the atmosphere, effectively improves the yield of the blast furnace, reduces the production cost, can provide the fuel gas with medium or higher heat value, and supplies hot air furnace and heating air, and can realize the emission reduction of the carbon monoxide in the flue gas of any combustion furnace, and the heat supplementing mode is the heat supplementing of a plasma gun or the heat supplementing of the air temperature and the simultaneous heat supplementing of the plasma gunThe method is innovation of a zero emission method of flue gas of the hot blast stove.
Description
Technical Field
The invention relates to the field of hot blast stoves, in particular to a method capable of realizing zero emission and utilization of flue gas of a hot blast stove.
Background
In China, two or three thousand blast furnaces are used for annual production of billions of tons of pig iron, and each ton of pig iron is discharged by 700-800m 3 The weight of the flue gas per t is 994-1136kg, namely about 1 ton, and the CO thereof 2 The weight of the flue gas is 30-40%, namely, china discharges billions of tons of flue gas and 3-5 billions of CO into the atmosphere every year 2 This is only the metallurgical industry, but also the power generation industry, chemical industry, cement industry, etc. CO 2 Is quite remarkable in emission of CO 2 The environment is seriously influenced, and the main influences are as follows: A. influencing microclimateAnd solar radiation; B. generating greenhouse effect: CO in the atmosphere 2 Belongs to greenhouse gases, and a large amount of the greenhouse gases can absorb heat radiation emitted by the ground surface to heat the atmosphere, which is called greenhouse effect; therefore, the greenhouse effect of carbon dioxide can cause the global temperature to rise, thereby causing the sea level to rise, the frozen pre-historic virus can be thawed and melted to threaten the life safety of human beings, the global desert area is enlarged, and the ocean disasters are increased continuously; C. ozone layer destruction; D. acid rain is formed; E. generating photochemical smog; thus to CO 2 Is becoming a worldwide problem. The national importance is also very important, and the emission of CO is reduced 2 The invention is urgent and how to realize zero emission of the hot blast stove is not a precedent at home and abroad, so the invention is imperative to a flue gas utilization system capable of realizing zero emission of the hot blast stove.
Disclosure of Invention
Aiming at the situation, the invention aims to provide a method for realizing zero emission of flue gas of a hot blast stove, which can effectively solve the problem of CO 2 The emission reduction problem of the hot blast stove is realized.
The invention solves the technical scheme that the flue gas is blown into a blast furnace to realize pure oxygen iron making and the flue gas making of a flue gas making furnace or the reduction gas to realize zero emission of the flue gas of the hot blast furnace and the utilization of the flue gas, wherein the flue gas is the flue gas of any combustion furnace, carbon dioxide in the flue gas generates carbon monoxide and needs to be supplemented with heat, and the heat supplementing mode is that a plasma gun supplements heat or the air temperature is increased to supplement heat or the air temperature is increased and the plasma gun supplements heat simultaneously.
The method specifically comprises the following steps of using a system capable of realizing zero emission of flue gas of the hot blast stove:
1) In the combustion period of the hot blast stove A, flue gas generated by combustion enters a first flue, one part of the flue gas enters a gas preheater to preheat gas, and the other part of the flue gas enters an air preheater through a first pipeline to preheat air;
2) The flue gas after preheating the coal gas and air enters a second flue, one part of the flue gas in the second flue enters a flue gas purifier, and the other part of the flue gas enters the flue gas purifier through a first regulating valve;
3) The flue gas purified by the flue gas purifier enters a blast furnace blower through a second regulating valve, and meanwhile, oxygen prepared by an oxygenerator enters the blast furnace blower through a third regulating valve;
4) The flue gas and oxygen are respectively regulated in proportion through a second regulating valve and a third regulating valve, blown into a hot blast stove B for heating, and then enter a tuyere combustion zone of a blast furnace C through a hot air surrounding pipe and a first self-blowing pipe (air inlet pipe);
5) CO in flue gas 2 CO is generated by reacting with carbon hot in the tuyere combustion zone, and the CO is subjected to endothermic reaction, so that a plasma gun is used for supplementing heat in time according to the furnace condition;
6) The blast furnace gas generated in the blast furnace C enters a gravity dust remover, a cloth bag dust remover, a TRT or a BPRT device for dust removal and depressurization through a gas delivery pipe, a rising pipe and a falling pipe, enters a clean gas main pipe, and enters a hot blast stove or is supplied to other users through a gas branch pipe;
7) In the combustion period of the hot blast furnace A, the flue gas purified by the flue gas purifier is blown into the hot blast furnace B by the exhaust fan, meanwhile, oxygen is blown into the hot blast furnace B by the exhaust fan, and then enters more than 4 second self-blowing pipes through the gas making furnace surrounding pipe to be blown into the tuyere combustion area of the gas making furnace D, a third regulating valve on an oxygen pipeline and a second regulating valve on a flue gas pipeline are regulated, so that the proportion of oxygen and flue gas is ensured to be at the optimal position;
8) After pelletizing and granulating, conveying the fuel and the flux of the gas making furnace to the top of the gas making furnace D along a first belt conveyor, loading the fuel and the flux into the furnace by a feeding machine, and slowly descending to a combustion zone by gravity;
9) The gas generated in the tuyere combustion zone and the peripheral reduction zone of the gas making furnace D rises along the gas making furnace D, is cooled at the same time, is guided out through a gas guiding pipe, enters a cyclone dust collector along a rising pipe and a falling pipe, and is sent to a gas user after passing through a bag dust collector.
The method is simple and easy to implement, novel and unique, is easy to implement, eliminates the pollution of the exhaust flue gas of the blast furnace to the atmosphere, effectively improves the yield of the blast furnace, reduces the production cost, can provide fuel gas with more than medium heat value, is used for a hot air supply furnace, a heating furnace or a power plant, and is an innovation on a zero discharge method of the flue gas of the hot air furnace.
Drawings
Fig. 1 is a schematic diagram of a system structure according to the present invention.
Detailed Description
The following describes the embodiments of the present invention in further detail with reference to the drawings.
As shown in fig. 1, the invention uses a flue gas utilization system capable of realizing zero emission of flue gas of a hot blast stove, and then comprises the following steps:
1) In the combustion period of the hot blast stove A, flue gas generated by combustion enters a first flue 1, one part of the flue gas enters a gas preheater 2 to preheat gas, and the other part of the flue gas enters an air preheater 4 through a first pipeline 3 to preheat air;
2) The flue gas after preheating coal gas and air enters a second flue 5, one part of the flue gas in the second flue 5 enters a flue gas purifier 7, and the other part of the flue gas enters a flue gas purifier 22 through a first regulating valve 6;
3) The flue gas purified by the flue gas purifier 7 enters a blast furnace blower 11 through a second regulating valve 8, and meanwhile, oxygen prepared by the oxygenerator 9 enters the blast furnace blower 11 through a third regulating valve 10;
4) The flue gas and oxygen are respectively regulated in proportion by a second regulating valve 8 and a third regulating valve 10, blown into a hot blast stove B for heating, and then enter a tuyere burning zone of a blast furnace C through a hot air surrounding pipe 12 and a first self-blowing pipe 13;
5) CO in flue gas 2 CO is generated by the reaction with the carbon hot in the combustion area of the tuyere of the blast furnace C, and the CO is an endothermic reaction, so that the plasma gun 14 is used for supplementing heat in time according to the furnace condition;
6) Blast furnace gas generated in the blast furnace C enters a gravity dust remover 16, a cloth bag dust remover 17, a TRT or BPRT device 18 through a gas delivery pipe 15, a rising pipe 29 and a falling pipe 30, enters a clean gas main pipe 19 after dust removal and depressurization, and then enters a hot blast stove or is supplied to other users through a gas branch pipe;
7) In the combustion period of the hot blast stove A, the flue gas purified by the flue gas purifier 22 is blown into the hot blast stove B by the exhaust fan 25, meanwhile, oxygen 23 is blown into the hot blast stove B by the exhaust fan 25, and then is blown into a tuyere combustion zone of the gas making stove D by the gas making stove surrounding pipe 26 and more than 4 second self-blowing pipes 27, and a fourth regulating valve 24 on an oxygen 23 pipeline is regulated, so that the regulation of the oxygen amount to an optimal position is ensured;
8) After the fuel and the flux 34 are granulated or pelletized, the fuel and the flux are conveyed to the top of the gas making furnace D along a first belt conveyor 35, and the fuel and the flux are filled into the furnace by a feeding machine 36 and slowly fall to a combustion zone by gravity;
9) The gas generated in the tuyere burning zone and the peripheral reduction zone of the gas making furnace D rises along the gas making furnace D, is cooled at the same time, is guided out through a gas guiding pipe 28, enters a cyclone dust collector 31 along a rising pipe 29 and a falling pipe 30, and is sent to a gas user 33 after passing through a bag dust collector 32.
The smoke ratio is 0-100%, and the oxygen ratio is CO 2 Completely becomes CO.
The oxygen amount reaches the optimal position of CO 2 Becomes the location of the CO entirely.
The flue gas utilization system capable of realizing zero emission of the flue gas of the hot blast furnace comprises a gas preheater, an air preheater, a flue gas purifier and a blower, wherein a first flue 1 is connected with the gas preheater 2 and is connected with the air preheater 4 through a first pipeline 3, the gas preheater 2 and the air preheater 4 are both connected with a second flue 5, the second flue 5 is respectively connected with the flue gas purifier 7 and the flue gas purifier 22, the flue gas purifier 7 is connected with the blast furnace blower 11 through a fourth pipeline 38, the blast furnace blower 11 is respectively connected with the hot blast furnace B and the oxygenerator 9 through a second pipeline 40 and a third pipeline 39, the hot blast furnace B is respectively connected with the blast furnace C and a first self-blowing pipe 13 through a hot air surrounding pipe 12, the first self-blowing pipe 13 is connected with a plasma gun 14, the upper part of the blast furnace C is provided with a gas delivery pipe 15, the gas delivery pipe 15 is connected with the gas preheater 2 through a gas branch pipe of the clean gas main pipe 19, a gravity dust remover 16, a cloth bag dust remover 17, a TRT or BPRT device 18 is sequentially arranged on the end, close to the gas delivery pipe 15, of the clean gas main pipe 19, the smoke purifier 22 is connected with the exhaust fan 25 through a fifth pipeline 37, the oxygen 23 is connected with the exhaust fan 25 through a fifth pipeline 37 branch pipe, the exhaust fan 25 is connected with a gas making furnace enclosure pipe 26 of a gas making furnace D through a hot blast furnace B, the gas making furnace enclosure pipe 26 is connected with a second self-blowing pipe 27, a gas delivery pipe 28 is arranged at the upper part of the gas making furnace, the top of the gas making furnace D is connected with a cyclone dust remover 31 through a rising pipe 29 and a falling pipe 30, the cyclone dust remover 31 is connected with a cloth bag dust remover 32, the cloth bag dust remover 32 is connected with a gas user 33, a feeding machine 36 is arranged at the inner top of the gas making furnace D, and the feeding machine 36 is connected with fuel and flux 34 through a first belt machine 35.
In order to ensure the use effect, the second flue 5 is provided with a first regulating valve 6.
The fourth pipe 38 is provided with a second regulating valve 8.
The third pipeline 39 is provided with a third regulating valve 10.
The fifth pipeline 37 branch pipe is provided with a fourth regulating valve 24.
The top of the blast furnace C is provided with a charging machine 21 which is connected with the granulator through a second belt conveyor 20.
The invention has the use conditions that the invention comprises a hot blast stove, blast furnace injection flue gas and a pure oxygen iron making and flue gas making stove; the oxygen-enriched combustion or pure oxygen combustion of the hot blast stove can reduce the flue gas amount by 20-25%, 70-80% of flue gas can be used for blast furnace injection flue gas pure oxygen iron making, the rest part is completely used for a flue gas making furnace to manufacture fuel gas, and the hot blast stove flue gas can be completely used, so that the method can realize zero emission of the blast furnace hot blast stove flue gas, and besides, the method can also be composed of two systems of flue gas generated by the hot blast stove, blast furnace injection flue gas and pure oxygen iron making, and a small amount of flue gas is discharged; the flue gas can also be generated by the hot blast stove through oxygen-enriched or total oxygen combustion, and the flue gas is blown by the blast furnace and ironmaking by pure oxygen, and the flue gas is completely blown by the blast furnace without being discharged; the flue gas can be generated only by the hot blast stove, and the two systems of the gas or the reducing gas can be manufactured by the flue gas making stove without discharging the flue gas.
The following should be provided in the tuyere zone of the blast furnace:
C+O 2 =CO 2 +94680 (Qiarca) (1)
CO 2 +c=2co-38520 (kcal) (2)
2C+O 2 =2co+56160 (kcal) (3)
As can be seen from the formula (2), CO is injected into the tuyere zone of the blast furnace 2 Can generate CO under the condition of C, wherein the CO can be used as a reducing agent or can be used asIs fuel, but this reaction is an endothermic reaction, and requires replenishment of heat.
The hot C is arranged in the tuyere zone of the blast furnace, the temperature is 1900-2300 ℃, and the reaction condition of the equation (2) is provided. This is also true in that CO is first formed in the blast furnace tuyere high oxidation zone (combustion zone center) 2 When CO 2 And the mixture enters the edge of the combustion zone to continuously react with C to generate CO. Equation (2) will continue to react as long as we continuously supply the heat needed for the reaction of equation (2). Supplying heat to the air ports, there are currently two ways: firstly, the wind temperature is increased, and secondly, plasma is adopted; the improvement of the wind temperature is limited, the current condition can be improved to 1400 ℃ at the highest, and the working temperature of the plasma gun can reach more than 5000 ℃.
When the blast furnace is used for normal production, the temperature of the tuyere zone is 1900-2300 ℃, generally 2000-2200 ℃, and the furnace is heated beyond the temperature, is not smooth, and is cooled below the temperature. The temperature of the hot air can be increased, so that the combustion temperature of the tuyere can be increased, and the combustion temperature of the tuyere can be increased by spraying plasma flow; the pulverized coal is sprayed to reduce the combustion temperature of the tuyere and CO is sprayed 2 The combustion temperature of the tuyere can also be reduced. At present, the lower part of the blast furnace operation is used for adjusting the air quantity, the air temperature and the coal dust besides the diameter and the length of the tuyere, if CO is sprayed in 2 And after plasma, two lower adjustment means may be added. The air temperature is calculated to be increased to 1350 ℃ and 9-10% of the flue gas can be sprayed, and if the heat is supplemented by the sprayed plasma flow, about 80% of the flue gas can be sprayed to realize pure oxygen ironmaking.
Compared with the prior art, the method has the following advantages:
1. the pollution of the exhaust fume of the blast furnace to the atmosphere is eliminated;
2. under the condition that ore grade, air quantity and air pressure are unchanged, the yield of the blast furnace is improved by 3-4 times;
3. under the condition that ore grade, air quantity, air pressure, material price and shared expense are unchanged, the 1 ton iron cost can be reduced by 50-100 yuan;
4. the yield of the blast furnace can be regulated within 1-3 times according to the market sales condition;
5. can provide fuel gas with medium or higher heat value for hot air supply furnace, heating furnace or power plant.
In summary, the invention has novel and unique design, easy implementation, simple and easy method and reliable theoretical basis, and sprays coal dust, natural gas and reducing gas into the blast furnace, but does not spray flue gas and pure oxygen for iron making, and does not realize zero emission of the hot blast stove; the method for zero emission of flue gas and utilization of the flue gas of the hot blast stove is the initiative in the world at present, and has good economic and social benefits.
It is noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and the present invention is not limited thereto, and that any equivalent embodiments which can be modified or altered by persons skilled in the art without departing from the scope of the invention are within the scope of the invention.
Claims (8)
1. A method for realizing zero emission and flue gas utilization of hot blast furnace flue gas is characterized in that pure oxygen iron making is realized by blowing flue gas into a blast furnace, and gas or reducing gas is manufactured by a flue gas making furnace to realize zero emission and flue gas utilization of the hot blast furnace flue gas, wherein the flue gas is the flue gas of any combustion furnace, carbon dioxide in the flue gas generates carbon monoxide and needs to be supplemented with heat, and the heat supplementing mode is that a plasma gun supplements heat or the air temperature is increased to supplement heat or the air temperature and the plasma gun simultaneously supplement heat.
2. The method for realizing zero emission and flue gas utilization of the hot blast stove according to claim 1, which is characterized by comprising the following steps:
1) in the combustion period of the hot blast stove A, flue gas generated by combustion enters a first flue (1), one part of the flue gas enters a gas preheater (2) to preheat gas, and the other part of the flue gas enters an air preheater (4) through a first pipeline (3) to preheat air;
2) The flue gas after preheating the coal gas and air enters a second flue (5), one part of the flue gas in the second flue (5) enters a flue gas purifier (7), and the other part of the flue gas enters a flue gas purifier (22) through a first regulating valve (6);
3) The flue gas purified by the flue gas purifier (7) enters a blast furnace blower (11) through a second regulating valve (8), and meanwhile, oxygen prepared by the oxygenerator (9) enters the blast furnace blower (11) through a third regulating valve (10);
4) The flue gas and oxygen are respectively regulated in proportion by a second regulating valve (8) and a third regulating valve (10), blown into a hot blast stove B for heating, and then enter an air port combustion area of a blast furnace C through a hot air surrounding pipe (12) and a first self-blowing pipe (13);
5) CO in flue gas 2 CO is generated by the reaction with the carbon hot in the combustion area of the blast furnace C tuyere, and the CO is an endothermic reaction, so that a plasma gun (14) is used for supplementing heat in time according to the furnace condition;
6) Part of blast furnace gas generated in the blast furnace C enters a gravity dust remover (16), a cloth bag dust remover (17), a TRT or BPRT device (18) through a gas delivery pipe (15), a rising pipe (29) and a falling pipe (30), enters a clean gas main pipe (19) after dust removal and depressurization, and then enters a hot blast stove or is supplied to other users through a gas branch pipe;
7) In the combustion period of the hot blast stove A, the flue gas purified by the flue gas purifier (22) is blown into the hot blast stove B by the exhaust fan (25), meanwhile, oxygen (23) is blown into the hot blast stove B by the exhaust fan (25), and then is blown into a tuyere combustion area of the gas making stove D by a gas making stove surrounding pipe (26) and more than 4 second self-blowing pipes (27), and a fourth regulating valve (24) on a pipeline of the oxygen (23) is regulated, so that the regulated oxygen amount is ensured to be at an optimal position;
8) After the fuel and the flux (34) are granulated or pelletized, the fuel and the flux are conveyed to the top of the gas making furnace D along a first belt conveyor (35), the fuel and the flux are filled into the furnace by a feeding machine (36) and slowly descend to a combustion zone by gravity;
9) The gas generated in the tuyere combustion zone and the peripheral reduction zone of the gas making furnace D rises along the gas making furnace D, is cooled at the same time, is guided out through a gas guiding pipe (28), enters a cyclone dust collector (31) along a rising pipe (29) and a descending pipe (30), and is sent to a gas user (33) through a bag dust collector (32).
3. The method for realizing zero emission and flue gas utilization of the hot blast stove according to claim 2, wherein the system for realizing zero emission and flue gas utilization of the hot blast stove comprises a gas preheater, an air preheater, a flue gas purifier and a blower, wherein the first flue (1) is connected with the gas preheater (2) and is connected with the air preheater (4) through a first pipeline (3), the gas preheater (2) and the air preheater (4) are both connected with the second flue (5), the second flue (5) is respectively connected with the flue gas purifier (7) and the flue gas purifier (22), the flue gas purifier (7) is connected with the blast furnace blower (11) through a fourth pipeline (38), the blast furnace blower (11) is respectively connected with the hot blast furnace B and the oxygen generator (9) through a hot air surrounding pipe (12) and is respectively connected with the blast furnace C and a first self-blowing pipe (13), the first self-blowing pipe (13) is connected with the plasma gun (14), the upper part of the blast furnace C is respectively connected with the flue gas purifier (7) and the flue gas purifier (19) through a fourth pipeline (38), and the blast furnace blower (11) is respectively connected with the blast furnace blower (19) through a second pipeline (40) and a third pipeline (39), and a dust collector (19) is sequentially connected with the gas purifier (19) and a gas collector (19) and a dust collector (19) near the gas collector (19) TRT or BPRT device (18), flue gas cleaner (22) link to each other with air exhauster (25) through fifth pipeline (37), oxygen (23) link to each other with air exhauster (25) through fifth pipeline (37) branch pipe, air exhauster (25) link to each other with gas making stove (26) of gas making stove D through hot-blast furnace B, gas making stove encloses pipe (26) and links to each other with second from blowpipe (27), gas making stove upper portion is provided with gas delivery tube (28), gas making stove D top links to each other with cyclone (31) through riser (29), downcomer (30), cyclone (31) link to each other with sack cleaner (32), sack cleaner (32) are connected gas user (33), the top is provided with material loading machine (36) in the gas making stove D, material loading machine (36) link to each other with fuel and flux (34) through first belt feeder (35).
4. A method for realizing zero emission and utilization of flue gas of a hot blast stove according to claim 3, wherein the second flue (5) is provided with a first regulating valve (6).
5. A method for realizing zero emission and utilization of flue gas from a hot blast stove according to claim 3, wherein the fourth conduit (38) is provided with a second regulating valve (8).
6. A method for realizing zero emission and utilization of flue gas from a hot blast stove according to claim 3, wherein the third pipeline (39) is provided with a third regulating valve (10).
7. A method for realizing zero emission and utilization of flue gas of a hot blast stove according to claim 3, wherein a fourth regulating valve (24) is arranged on a branch pipe of the fifth pipeline (37).
8. A method for realizing zero emission and flue gas utilization of a hot blast stove according to claim 3, wherein the top of the blast furnace C is provided with a charging machine (21) which is connected with a granulator through a second belt conveyor (20).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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