CN117925926A - Method for realizing pure oxygen iron making by blowing flue gas into blast furnace - Google Patents
Method for realizing pure oxygen iron making by blowing flue gas into blast furnace Download PDFInfo
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- CN117925926A CN117925926A CN202410021984.5A CN202410021984A CN117925926A CN 117925926 A CN117925926 A CN 117925926A CN 202410021984 A CN202410021984 A CN 202410021984A CN 117925926 A CN117925926 A CN 117925926A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 138
- 239000003546 flue gas Substances 0.000 title claims abstract description 136
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 52
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 40
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 238000007664 blowing Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 25
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 11
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 61
- 230000001105 regulatory effect Effects 0.000 claims description 57
- 239000000428 dust Substances 0.000 claims description 41
- 238000002485 combustion reaction Methods 0.000 claims description 31
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 21
- 229910052760 oxygen Inorganic materials 0.000 claims description 21
- 239000001301 oxygen Substances 0.000 claims description 21
- 239000000571 coke Substances 0.000 claims description 18
- 230000004907 flux Effects 0.000 claims description 16
- 238000005245 sintering Methods 0.000 claims description 14
- 238000005453 pelletization Methods 0.000 claims description 13
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000004744 fabric Substances 0.000 claims description 10
- 230000001502 supplementing effect Effects 0.000 claims description 10
- 230000005484 gravity Effects 0.000 claims description 9
- 239000013589 supplement Substances 0.000 claims description 8
- 239000003570 air Substances 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 239000003034 coal gas Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 230000000630 rising effect Effects 0.000 claims description 6
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- 238000004513 sizing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 4
- 229910000805 Pig iron Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- 230000005855 radiation Effects 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
- 239000003245 coal Substances 0.000 description 1
- 239000002817 coal dust Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000005431 greenhouse gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
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- Manufacture Of Iron (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
The invention relates to a method for realizing pure oxygen iron making by blowing flue gas into a blast furnace, which can effectively solve the problems that the flue gas of the hot blast furnace returns and is sprayed into a blast furnace tuyere zone without being discharged, so that the yield is increased, the cost is reduced and the carbon dioxide emission is reduced; the invention has novel and unique design, easy implementation, simple and feasible method and reliable theoretical basis, can reduce the pollution of 70-80% of the flue gas discharged from the blast furnace to the atmosphere, effectively improves the yield of the blast furnace, reduces the production cost, and is an innovation of the blast furnace ironmaking method.
Description
Technical Field
The invention relates to the technical field of iron making, in particular to a method for realizing pure oxygen iron making by blowing flue gas into a blast furnace.
Background
The existing blast furnace in China has two and three thousands of seats, more than one hundred million tons of pig iron are produced annually, each ton of pig iron needs to discharge 700-800m 3/t of flue gas, the weight of CO 2 of the blast furnace is about 1 ton, the weight of the blast furnace accounts for 30-40%, namely, more than one hundred million tons of flue gas are discharged into the atmosphere annually in China, and 3-5 hundred million tons of CO 2,CO2 has serious influence on the environment, and the main influence is as follows: A. influence microclimate and solar radiation; B. generating greenhouse effect: CO 2 in the atmosphere belongs to greenhouse gases, and a large amount of the CO 2 can absorb heat radiation emitted by the ground surface to heat the atmosphere, so that the greenhouse effect is realized; 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. photochemical smog was generated. Therefore, the emission of CO 2 is more and more severe, which is a world problem, and the national importance is paid very much, and the emission reduction of CO 2 is urgent, but the pure oxygen iron making method is not a precedent at home and abroad, so the invention of the pure oxygen iron making method for reducing the emission of CO 2 is a technical problem which needs to be solved at present.
Disclosure of Invention
Aiming at the situation, the invention aims to solve the defects of the prior art, and the invention aims to provide a method for realizing pure oxygen iron making by blowing flue gas into a blast furnace, which can effectively solve the problem that the flue gas of the hot blast furnace returns and is sprayed into a blast furnace tuyere zone without being discharged, so that the yield is increased, the cost is reduced and the carbon dioxide emission is reduced.
The invention solves the technical scheme that part of flue gas, oxygen and air are used for iron making or flue gas and pure oxygen are used for iron making, the flue gas is the flue gas of any combustion furnace, and the 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 or the air temperature and the plasma gun simultaneously supplement heat.
Further, after the coke, sintering, pelletizing and flux are granulated, conveying the granulated coke, the sintered coke, the pelletized and the flux into a top charging machine of a blast furnace by a belt conveyor, and charging the granulated coke, the sintered coke, the pellets and the flux into the blast furnace in batches; simultaneously, the flue gas and the pure oxygen are blown into the tuyere to realize pure oxygen iron making, specifically, a device I for realizing pure oxygen iron making by blowing the flue gas into a blast furnace is utilized, and then the method is carried out according to the following steps:
1) After the coke, sintering, pelletizing and flux are granulated, the coke, the sintering, the pelletizing and the flux are conveyed into a blast furnace top charger 21 by a belt conveyor 20 and are fed into a blast furnace in batches;
2) In the burning period of the hot blast stove A, flue gas generated by burning enters a first flue, one part of the flue gas enters a gas preheater for preheating gas, and the other part of the flue gas enters an air preheater through a first pipeline for preheating air;
3) 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 a chimney through a first regulating valve;
4) 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;
5) 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 self-blowing pipe (an air inlet pipe);
6) CO 2 in the flue gas reacts with hot carbon in the tuyere combustion zone to generate CO, and the CO is an endothermic reaction, so that a plasma gun is used for supplementing heat in time according to the furnace condition;
7) 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 other users through a gas branch pipe.
Or the coke, the sintering, the pellet and the flux are conveyed into a furnace top charger of the blast furnace by a belt conveyor after being granulated, and are charged into the blast furnace in batches; simultaneously, the flue gas, oxygen and air are blown into the tuyere to realize iron making, specifically, a second device for realizing pure oxygen iron making by blowing the flue gas into a blast furnace is utilized, and then the method is carried out according to the following steps:
1) After the coke, sintering, pelletizing and flux are granulated, the coke, the sintering, the pelletizing and the flux are conveyed into a blast furnace top charger 21 by a belt conveyor 20 and are fed into a blast furnace in batches;
2) In the burning period of the hot blast stove A, flue gas generated by burning enters a first flue, one part of the flue gas enters a gas preheater for preheating gas, and the other part of the flue gas enters an air preheater through a first pipeline for preheating air;
3) 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 a chimney through a first regulating valve;
4) The flue gas purified by the flue gas purifier enters a blast furnace blower through a second regulating valve, meanwhile, oxygen prepared by an oxygenerator enters the blast furnace blower through a third regulating valve, and air enters the blast furnace blower through a fourth regulating valve;
5) The flue gas, oxygen and air are respectively regulated by a second regulating valve, a third regulating valve and a fourth regulating valve according to proportion, 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 self-blowing pipe;
6) CO in the flue gas reacts with hot carbon in the tuyere combustion zone to generate CO, and the CO is an endothermic reaction, so that a plasma gun is used for supplementing heat in time according to the furnace condition;
7) 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 other users through a gas branch pipe.
The invention has novel and unique design, easy implementation, simple and easy method and reliable theoretical basis, can reduce the pollution of 70-80% of the flue gas discharged from the blast furnace to the atmosphere, effectively improves the yield of the blast furnace, reduces the production cost, and is an innovation of the blast furnace ironmaking method.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural diagram of another embodiment of the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples.
Examples
As shown in fig. 1, the present invention uses a first apparatus for realizing pure oxygen iron making by blowing flue gas into a blast furnace, and then comprises the following steps:
1) After the coke, sintering, pelletizing and flux are granulated, the coke, the sintering, the pelletizing and the flux are conveyed into a blast furnace top charger 21 by a belt conveyor 20 and are fed into a blast furnace in batches;
2) 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 for preheating gas, and the other part of the flue gas enters an air preheater 4 through a first pipeline 3 for preheating air;
3) 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 chimney through a first regulating valve 6;
4) 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;
5) 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 combustion zone of a blast furnace C through a hot air surrounding pipe 12 and a self-blowing pipe 13;
6) CO 2 in the flue gas reacts with hot carbon in the tuyere combustion zone to generate CO, 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;
7) 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 for dust removal and depressurization through a gas delivery pipe 15, a rising pipe and a falling pipe, enters a clean gas main pipe 19, and enters a hot blast stove or other users through a gas branch pipe.
The flue gas proportion is 0-100%, and the oxygen proportion is that CO 2 is completely changed into CO.
The device for realizing pure oxygen iron making by blowing flue gas into a 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 a chimney, the flue gas purifier 7 is connected with the blast furnace blower 11 through a second pipeline 22, the blast furnace blower 11 is respectively connected with the oxygen generator 9 and the hot blast furnace B through a third pipeline 23 and a fourth pipeline 24, the hot blast furnace B is connected with the self-blowing pipe 13 through a hot air surrounding pipe 12, the self-blowing pipe 13 is connected with the plasma gun 14, the gas is provided with a gas leading-out pipe 15 at the upper part of the blast furnace C, enters a gravity dust remover 16, a cloth bag dust remover 17, a TRT or a BPRT device 18 through the leading-out pipe 15, enters the hot blast furnace or other users through a gas branch pipe 19 after dust removal and depressurization, the top of the blast furnace C is provided with a charger 21, and the blast furnace C is connected with a granulator through a belt conveyor 20.
The second flue 5 is provided with a first regulating valve 6.
The second pipeline 22 is provided with a second regulating valve 8.
The third pipeline 23 is provided with a third regulating valve 10.
The air preheater 4 is connected with a combustion-supporting fan 25.
Examples
As shown in fig. 2, the present invention uses a second apparatus for realizing pure oxygen iron making by blowing flue gas into a blast furnace, and then comprises the following steps:
1) After the coke, sintering, pelletizing and flux are granulated, the coke, the sintering, the pelletizing and the flux are conveyed into a blast furnace top charger 21 by a belt conveyor 20 and are fed into a blast furnace in batches;
2) 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 for preheating gas, and the other part of the flue gas enters an air preheater 4 through a first pipeline 3 for preheating air;
3) 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 chimney through a first regulating valve 6;
4) The flue gas purified by the flue gas purifier 7 enters a blast furnace blower 11 through a second regulating valve 8, meanwhile, oxygen prepared by the oxygenerator 9 enters the blast furnace blower 11 through a third regulating valve 10, and air enters the blast furnace blower 11 through a fourth regulating valve 26;
5) The flue gas, oxygen and air are respectively regulated in proportion by a second regulating valve 8, a third regulating valve 10 and a fourth regulating valve 26, 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 12 and a self-blowing pipe 13;
6) CO 2 in the flue gas reacts with hot carbon in the tuyere combustion zone to generate CO, 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;
7) 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 for dust removal and depressurization through a gas delivery pipe 15, a rising pipe and a falling pipe, enters a clean gas main pipe 19, and enters a hot blast stove or other users through a gas branch pipe.
The flue gas proportion is 0-100%, and the oxygen and air proportion is arbitrarily adjusted until CO 2 is completely changed into CO.
The device for realizing pure oxygen iron making by blowing flue gas into a 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 a chimney, the flue gas purifier 7 is connected with the blast furnace blower 11 through a second pipeline 22, the blast furnace blower 11 is respectively connected with the oxygenerator 9, the hot blast furnace B and the air blower through a third pipeline 23, a fourth pipeline 24 and a fifth pipeline 27, the hot blast furnace B is connected with a self-blowing pipe 13 through a hot air surrounding pipe 12, the 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 enters a gravity dust remover 16, a cloth bag dust remover 17, a TRT or a BPRT device 18 through a dust removal step-down, then enters a clean gas main 19 through a gas branch pipe or a hot blast furnace or other users, and the top of the blast furnace C is provided with a charging machine 21, and the blast furnace C is connected with a belt conveyor 20 through a belt conveyor.
In order to ensure the use effect, the second flue 5 is provided with a first regulating valve 6.
The second pipeline 22 is provided with a second regulating valve 8.
The third pipeline 23 is provided with a third regulating valve 10.
The fifth pipeline 27 is provided with a fourth regulating valve 26.
The air preheater 4 is connected with a combustion-supporting fan 25.
The invention has the use condition that after the flue gas of a combustion furnace or a hot blast furnace is purified, the flue gas is sprayed into a blast furnace tuyere zone, CO 2 in the flue gas is changed into CO as a reducing agent, CO 2 in the flue gas is changed into CO to be used as an endothermic reaction, a plasma gun is used for supplementing heat to the tuyere, if not so much yield is needed, part of flue gas can be utilized for oxygen-enriched iron making, the scheme can be used for improving the wind temperature to supplement heat, if the wind temperature to supplement heat can not be met along with the increase of the flue gas quantity, and the plasma gun can be used for supplementing heat to the tuyere.
The following should be provided in the tuyere zone of the blast furnace:
C+O 2=CO2 +94680 (kcal) (1)
CO 2 +C=2CO-38520 (kcal) (2)
2C+o 2 = 2co+56160 (kcal) (3)
As can be seen from formula (2), CO 2 is injected into the tuyere zone of the blast furnace, CO is produced in the presence of C, and CO can be used as a reducing agent or as fuel, but this reaction is an endothermic reaction, and heat must be supplied, and 1m 3CO2 is calculated to decompose with compensation heat 1719.64 (kilocalories)/m 3CO2, and 1 molar C is consumed.
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 the blast furnace tuyere high oxidation zone (combustion zone center) where CO 2 is first formed and CO is formed as CO2 enters the combustion zone edge to continue to react with C. 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 into the tuyere to reduce the combustion temperature of the tuyere, and the CO 2 is sprayed into the tuyere to reduce the combustion temperature of the tuyere. At present, the lower regulation of the blast furnace operation is to regulate the air quantity, the air temperature and the coal dust besides the diameter and the length of the air opening, and if CO 2 and plasma are sprayed, two lower regulation means can 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 invention has the following advantages:
1. The exhaust smoke of the blast furnace hot blast stove can be reduced by more than 80%, and the pollution to the atmosphere is greatly reduced;
2. under the condition that ore grade, air quantity and air pressure are unchanged, the yield is improved by more than 3 times;
3. under the condition that the ore grade, the air quantity, the air pressure and the material price are unchanged, the cost of 1 ton of iron 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 conditions.
In summary, the invention has novel and unique design, easy implementation, simple and easy method and reliable theoretical basis, and can iron by blowing flue gas, partial flue gas, oxygen and air, and also can iron by fully using flue gas and pure oxygen; if the blast furnace is used for making iron by using pure oxygen in flue gas, the carbon dioxide in the flue gas needs to be supplemented with heat, and the invention adopts a plasma gun to supplement heat, or improves the wind temperature and the plasma gun to supplement heat simultaneously. The method for realizing pure oxygen iron making by blowing flue gas into the blast furnace is a revolution and innovation of the iron making technology 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 person skilled in the art can make modifications and equivalents within the scope of the present invention without departing from the scope of the present invention.
Claims (9)
1. A method for realizing pure oxygen iron making by blowing flue gas into a blast furnace is characterized in that part of flue gas, oxygen and air are used for iron making or the flue gas and the pure oxygen are used for iron making, 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 or the air temperature and the plasma gun simultaneously supplement heat.
2. The method for realizing pure oxygen iron making by injecting flue gas into a blast furnace according to claim 1, wherein the device for realizing pure oxygen iron making by injecting flue gas into the blast furnace is used, and then the method comprises the following steps:
1) After the coke, sintering, pelletizing and flux are granulated, the coke, the sintering, the pelletizing and the flux are conveyed into a blast furnace top charger (21) by a belt conveyor (20) and are fed into a blast furnace in batches;
2) 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;
3) 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 chimney through a first regulating valve (6);
4) 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);
5) The flue gas and the 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 combustion zone of a blast furnace C from a blowing pipe (13) through a hot air surrounding pipe (12);
6) CO 2 in the flue gas reacts with hot carbon in the tuyere combustion zone to generate CO, 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;
7) 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 for dust removal and depressurization through a gas delivery pipe (15), a rising pipe and a falling pipe, enters a clean gas main pipe (19), and then enters a hot blast stove or other users through a gas branch pipe.
3. The method for realizing pure oxygen iron making by injecting flue gas into a blast furnace according to claim 1, wherein the device for realizing pure oxygen iron making by injecting flue gas into the blast furnace 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 connected with a second flue (5), the second flue (5) is respectively connected with the flue gas purifier (7) and a chimney, the flue gas purifier (7) is respectively connected with the blast furnace blower (11) through a second pipeline (22), the blast furnace blower (11) is respectively connected with the oxygen generator (9) and the hot blast furnace B through a third pipeline (23) and a fourth pipeline (24), the hot blast furnace B is connected with a self-blowing pipe (13), the 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) enters a dust collector (17) through a cloth bag delivery bag (15), a dust collector (17) and enters a dust collector (12) through a dust collector (19) or a dust collector (20) through a dust collector (12), and then enters a dust collector (20) through a dust collector (dust collector) through a dust collector) or a dust collector (dust collector) and a dust collector (dust collector).
4. The method for realizing pure oxygen iron making by blowing flue gas into a blast furnace according to claim 2, wherein the second flue (5) is provided with a first regulating valve (6); the second pipeline (22) is provided with a second regulating valve (8); the third pipeline (23) is provided with a third regulating valve (10).
5. The method for realizing pure oxygen iron making by blowing flue gas into a blast furnace according to claim 2, wherein the air preheater (4) is connected with a combustion fan (25).
6. The method for realizing pure oxygen iron making by blowing flue gas into a blast furnace is characterized by using a device for realizing pure oxygen iron making by blowing flue gas into the blast furnace, and then carrying out the following steps:
1) After the coke, sintering, pelletizing and flux are granulated, the coke, the sintering, the pelletizing and the flux are conveyed into a blast furnace top charger (21) by a belt conveyor (20) and are fed into a blast furnace in batches;
2) 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;
3) 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 chimney through a first regulating valve (6);
4) The flue gas purified by the flue gas purifier (7) enters a blast furnace blower (11) through a second regulating valve (8), meanwhile, oxygen prepared by the oxygenerator (9) enters the blast furnace blower (11) through a third regulating valve (10), and air enters the blast furnace blower (11) through a fourth regulating valve (26);
5) The flue gas, oxygen and air pass through a second regulating valve (8), a third regulating valve (10) and a fourth regulating valve (26) respectively according to the proportion of 10-25%:7-15%:60-83% of the air is regulated, blown into the hot blast stove B for heating, and then enters the tuyere combustion zone of the blast furnace C through the hot air surrounding pipe (12) and the self-blowing pipe (13);
6) CO (2) in the flue gas reacts with hot carbon in the tuyere combustion zone to generate CO, 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;
7) 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 for dust removal and depressurization through a gas delivery pipe (15), a rising pipe and a falling pipe, enters a clean gas main pipe (19), and then enters a hot blast stove or other users through a gas branch pipe.
7. The method for realizing pure oxygen iron making by injecting flue gas into a blast furnace according to claim 6, wherein the device for realizing pure oxygen iron making by injecting flue gas into the blast furnace 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 a second flue (5), the second flue (5) is respectively connected with the flue gas purifier (7) and the chimney, the flue gas purifier (7) is connected with the blast furnace blower (11) through a second pipeline (22), the blast furnace blower (11) is respectively connected with the oxygenerator (9), the hot blast stove B and the air machine through a third pipeline (23), a fourth pipeline (24) and a fifth pipeline (27), the hot blast stove B is connected with the self-blowing pipe (13) through a hot air surrounding pipe (12), the self-blowing pipe (13) is connected with the plasma gun (14), the upper part of the blast furnace C is provided with a gas delivery pipe (15), the gas enters the gravity dust remover (16), the cloth bag dust remover (17), the TRT or the BPRT device (18) through the delivery pipe (15), enters the clean gas main pipe (19) after dust removal and depressurization, then enters the hot blast stove or other users through a gas branch pipe, the top of the blast furnace C is provided with a charging machine (21), is connected with the grain sizing machine through a belt conveyor (20).
8. The method for realizing pure oxygen iron making by injecting flue gas into a blast furnace according to claim 7, wherein the second flue (5) is provided with a first regulating valve (6); the second pipeline (22) is provided with a second regulating valve (8); a third regulating valve (10) is arranged on the third pipeline (23); the fifth pipeline (27) is provided with a fourth regulating valve (26).
9. The method for realizing pure oxygen iron making by injecting flue gas into a blast furnace according to claim 7, wherein the air preheater (4) is connected with a combustion fan (25).
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