CN101871026A - Method for injecting carbon dioxide into blast furnace - Google Patents
Method for injecting carbon dioxide into blast furnace Download PDFInfo
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- CN101871026A CN101871026A CN 201010199232 CN201010199232A CN101871026A CN 101871026 A CN101871026 A CN 101871026A CN 201010199232 CN201010199232 CN 201010199232 CN 201010199232 A CN201010199232 A CN 201010199232A CN 101871026 A CN101871026 A CN 101871026A
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Abstract
The invention relates to a method for injecting carbon dioxide into a blast furnace, effectively solving the problems of energy wastage in blast-furnace iron-making, large CO2 emission and environmental pollution. The invention is structurally characterized in that after the combustion waste gas of a hot-blast furnace is heat-transferred and cooled by a front hot-blast furnace, the combustion waste gas is exhausted into atmosphere by a chimney through a flue; part of the inlet air of a blast-furnace blower is atmospheric air drawn through a regulating valve, the other part is hot-blast furnace waste gas drawn from the flue through a flue gas regulating valve, and the proportions of the atmospheric air and the hot-blast furnace waste gas drawn by the blast-furnace blower are controlled through the regulating valve according to the furnace temperature in the blast furnace; and the air and the hot-blast furnace waste gas drawn by the blast-furnace blower are pressurized by the blast-furnace blower, then enter the hot-blast furnace through a cold air pipe and are heated, and finally are blown into the tuyere area of the blast furnace through a hot blast pipe. The invention has the advantages that the method can be used in iron-making blast furnaces or gas generators to effectively and fully utilize the waste heat of waste gas produced by the iron-making blast furnaces or gas generators to reduce the temperature of the waste gas, the energy can be saved, the waste gas emission can be reduced, and the low-carbon economic benefit and the great social benefit can be obtained.
Description
One, technical field
The present invention relates to the blast furnace ironmaking energy-conserving and emission-cutting technology, is a kind of method to the blast furnace blowing carbonic acid gas.
Two, background technology
At present, all blast furnace ironmakings of the China and even the whole world adopt to blast-furnace tuyere coal injection or various oil or Sweet natural gas or plastic waste more, to reduce expensive metallurgical coke, these fuel of jetting, be to replace another kind of high energy price,, can not reduce discharging though it can reduce production costs with a kind of low price energy, can cause the destruction of topsoil and ecotope, life and production that influence is human, therefore, CO
2Discharging caused global concern.
Three, summary of the invention
At above-mentioned situation, the present invention's purpose just provides a kind of method to the blast furnace blowing carbonic acid gas, or contains the method for the waste gas of carbonic acid gas to blast furnace blowing, can effectively solve the blast furnace ironmaking save energy, reduce CO
2Discharging, antipollution problem, the technical scheme of its solution is, carbonic acid gas or the waste gas that contains carbonic acid gas blasted the cold-air duct of blast furnace blast, and after the hotblast stove heating, be blown into or sprayed into the tuyere zone of blast furnace by hot air duct; React at the oxygen of tuyere zone and red-hot carbon, generate carbonic acid gas, reaction formula is C+O
2=CO
2, newly-generated carbonic acid gas and the carbonic acid gas of bringing into and red-hot carbon react, and all generate carbon monoxide, and reaction formula is CO
2+ C=2CO, carbon monoxide are the reductive agents that blast-furnace smelting needs, thereby realize reaching the purpose of energy-saving and emission-reduction to the blast furnace blowing carbonic acid gas.
That is to say, the present invention is an inlet of the exhaust gas of hot-blast stove that contains carbonic acid gas being introduced blast furnace blowing engine, or blast cold-air duct by the waste gas that special fan extracts hotblast stove, and after the hotblast stove heating, be blown into or spray into the tuyere zone of blast furnace by hot air duct, method is that the combustion exhaust of hotblast stove enters atmosphere through flue by chimney after preposition hotblast stove conducts heat the reduction temperature; The air inlet part of blast furnace blowing engine is to draw atmosphere through variable valve, and another part is to draw exhaust gas of hot-blast stove through smoke regulating valve from flue, and the ratio that blast furnace blowing engine is drawn atmosphere and exhaust gas of hot-blast stove is to realize control according to the furnace temperature in the blast furnace by variable valve; Air that blast furnace blowing engine is drawn and exhaust gas of hot-blast stove enter the hotblast stove heating by cold-air duct after the blast furnace blowing engine pressurization, blast the tuyere zone of blast furnace again by hot air duct, or draw exhaust gas of hot-blast stove and blast cold-air duct from flue by smoke regulating valve by special fan, mix with the cold wind of blast furnace, mix wind and heat, spray into or be blown into the blast-furnace tuyere district again by hot air duct through hotblast stove.
The present invention can also contain the waste gas of carbonic acid gas with other except that using exhaust gas of hot-blast stove, also can directly use carbon dioxide.
The present invention can be effective to iron-smelting blast furnace, or producer gas generator, makes full use of self waste gas residual heat, spent air temperture is reduced, but save energy reduces exhaust gas emission, reduce the CO2 environmental pollution caused by discharge, effectively realize energy-saving and emission-reduction, low-carbon economy and huge social benefit.
Four, description of drawings
Fig. 1 extracts the schema that exhaust gas of hot-blast stove blasts blast furnace for the present invention with blast furnace blowing engine.
Fig. 2 extracts the schema that exhaust gas of hot-blast stove blasts blast furnace for the present invention with blower fan.
Five, embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is elaborated.
By shown in Figure 1, the embodiment of the invention 1 is realized by following method:
The combustion exhaust of hotblast stove enters atmosphere by flue 5 through chimney 6 after preposition hotblast stove 4 conducts heat cooling; The air inlet part of blast furnace blowing engine 10 is to draw atmosphere (air) through air inlet adjustment valve 9, another part is through the waste gas of smoke regulating valve 7 from flue 3 extract heat wind furnaces, the atmosphere that blast furnace blowing engine is drawn and the ratio of exhaust gas of hot-blast stove are by smoke regulating valve 7 according to the furnace temperature in the blast furnace, air inlet adjustment valve 9 is realized control, the volume ratio of the waste gas of general atmosphere and hotblast stove is that 70-90%: 10-30% (is that atmosphere is 70-90%, the waste gas of hotblast stove is 10-30%), after atmosphere that blast furnace blowing engine is drawn in proportion and the pressurization of the waste gas of hotblast stove, entering hotblast stove 3 by cold-air duct 11 is heated to more than 1300-1450 ℃, spray into or be blown into the tuyere zone of blast furnace 1 again by hot air duct 2, produce thermopositive reaction at the oxygen of tuyere zone and red-hot carbon, generate carbonic acid gas, reaction formula is C+O
2=CO
2, newly-generated carbonic acid gas and the carbonic acid gas that brings from the waste gas of hotblast stove and red-hot carbon produce endothermic reaction, and all generate carbon monoxide, and reaction formula is CO
2+ C=2CO, carbon monoxide are the reductive agents that blast-furnace smelting needs, thereby realize the purpose to the energy-saving and emission-reduction of blast furnace blowing carbonic acid gas.
In order to guarantee the fan life effect, on the pipeline between said smoke regulating valve 7 and the blast furnace blowing engine 10 smoke filter 8 is housed, to guarantee the air inlet quality.
The embodiment of the invention 2 is realized by method shown in Figure 2, and the combustion exhaust of hotblast stove enters atmosphere by flue 5 through chimney 6 after preposition hotblast stove 4 conducts heat cooling; Blower fan 12 is drawn exhaust gas of hot-blast stove by smoke regulating valve 7 from flue 5, and blast cold-air duct 11, the atmosphere (freezing air) that is blown into cold-air duct 11 with blast furnace blowing engine 10 mixes, gas mixture is heated to more than 1300-1450 ℃ through hotblast stove 3, blast the tuyere zone of blast furnace 1 again by hot air duct 2, the volume ratio that blast furnace blowing engine is blown into the waste gas of the atmosphere of cold-air duct 11 and hotblast stove is generally 70-90%: 10-30%, produce thermopositive reaction at the oxygen of tuyere zone and red-hot carbon, generate carbonic acid gas, reaction formula is C+O
2=CO
2, newly-generated carbonic acid gas and the carbonic acid gas that brings from the waste gas of hotblast stove and red-hot carbon produce endothermic reaction, and all generate carbon monoxide, and reaction formula is CO
2+ C=2CO, carbon monoxide are the reductive agents that blast-furnace smelting needs, thereby realize the purpose to the energy-saving and emission-reduction of blast furnace blowing carbonic acid gas.
On the pipeline between said smoke regulating valve 7 and the special fan 12 smoke filter 8 is housed; On the blast inlet pipeline of blast furnace blowing engine 10 air inlet adjustment valve 9 is housed, to guarantee the air inlet quality.
The reaction of carbonic acid gas that brings from the waste gas of hotblast stove and red-hot carbon is thermo-negative reaction, and this part heat compensates by improving wind-warm syndrome and oxygen enrichment.Wind-warm syndrome is high more, and oxygen enrichment percentage is high more, and the amount of carbon dioxide that sprays into is many more, and effect is just remarkable more, so this method needs the cooperation of high wind-warm syndrome and oxygen enrichment.
The inventive method can be effective to blast furnace or gas generator, and the present invention compared with prior art, has following outstanding useful technique effect as calculated:
But 1, establish more than the preposition hot-blast stove preheated-combustion-supporting wind to 500 ℃, guarantee only with blast furnace gas ignition temperature is reached more than 1550 ℃, can take full advantage of the exhaust gas of hot-blast stove waste heat, the exhaust gas of hot-blast stove temperature is dropped to below 100 ℃, exhaust gas of hot-blast stove temperature than pipe heat exchanger is hanged down 60-70 ℃, can save blast furnace gas;
When 2, wind-warm syndrome is brought up to 1450 ℃ from 1000 ℃, can spray into the exhaust gas of hot-blast stove of the 10-15% that is equivalent to the blast furnace blower blow rate required, coke ratio can reduce 30-40kg/tIron；
3, wind-warm syndrome is brought up to 1450 ℃, oxygen enrichment 10% when above, can spray into the exhaust gas of hot-blast stove that is equivalent to the blast furnace blower blow rate required 30%, and coke ratio can reduce 40-60kg/tIronMore than, fuel ratio can drop to below the 420kg, waste gas (CO2) discharge capacity can reduce 30%, effectively reaches energy-saving and emission-reduction, the purpose of low-carbon economy and great social profit.
Claims (7)
1. method to the blast furnace blowing carbonic acid gas is characterized in that to the blast furnace blowing carbonic acid gas or contains the waste gas of carbonic acid gas.
2. the method to the blast furnace blowing carbonic acid gas according to claim 1, it is characterized in that: said to the blast furnace blowing carbonic acid gas or contain the waste gas of carbonic acid gas, it is the exhaust gas of hot-blast stove that will contain carbonic acid gas, after preposition hotblast stove (4) conducts heat cooling, enter atmosphere through chimney (6) by flue (5); The air inlet part of blast furnace blowing engine (10) is to draw atmosphere through air inlet adjustment valve (9), and another part is through the waste gas of smoke regulating valve (7) from flue (5) extract heat wind furnace; The atmosphere that blast furnace blowing engine is drawn and the ratio of exhaust gas of hot-blast stove are to realize control according to the furnace temperature in the blast furnace by smoke regulating valve (7), air inlet adjustment valve (9), the volume ratio of atmosphere and exhaust gas of hot-blast stove is 70-90%: 10-30%, atmosphere that blast furnace blowing engine is drawn in proportion and exhaust gas of hot-blast stove are after pressurization, enter hotblast stove (3) by cold-air duct (11) and be heated to 1300-1450 ℃, spray into or be blown into the tuyere zone of blast furnace (1) again by hot air duct (2).
3. the method to the blast furnace blowing carbonic acid gas according to claim 2 is characterized in that, on the said pipeline between smoke regulating valve (7) and blower fan (10) smoke filter (8) is housed.
4. the method to the blast furnace blowing carbonic acid gas according to claim 1, it is characterized in that: said to the blast furnace blowing carbonic acid gas or contain the waste gas of carbonic acid gas, be will contain carbonic acid gas exhaust gas of hot-blast stove after preposition hotblast stove (4) conducts heat cooling, enter atmosphere by flue (5) through chimney (6); Blower fan (12) is drawn exhaust gas of hot-blast stove by smoke regulating valve (7) from flue (5), and blast cold-air duct (11), the atmosphere that is blown into cold-air duct (11) with blast furnace blowing engine (10) mixes, gas mixture is heated to 1300-1450 through hotblast stove (3), blasts the tuyere zone of blast furnace (1) again by hot air duct (2); The ratio of the exhaust gas of hot-blast stove that atmosphere that blast furnace blowing engine is blown into and special fan suck is to realize control according to the furnace temperature in the blast furnace by smoke regulating valve (7), air inlet adjustment valve (9); The volume ratio of the atmosphere that blast furnace blowing engine is blown into and the waste gas of hotblast stove is 70-90%: 10-30%.
5. the method to the blast furnace blowing carbonic acid gas according to claim 4 is characterized in that, on the pipeline between said smoke regulating valve (7) and the blower fan (12) smoke filter (8) is housed.
6. the method to the blast furnace blowing carbonic acid gas according to claim 1, it is characterized in that: said to the blast furnace blowing carbonic acid gas or contain the waste gas of carbonic acid gas, to compensate heat by high wind-warm syndrome and oxygen enrichment, wind-warm syndrome is high more, oxygen enrichment percentage is high more, the amount of carbon dioxide that sprays into is many more, and effect is just remarkable more.
7. claim 1 or 2 or 4 described methods to the blast furnace blowing carbonic acid gas are also used on producer gas generator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010199232 CN101871026A (en) | 2010-06-12 | 2010-06-12 | Method for injecting carbon dioxide into blast furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010199232 CN101871026A (en) | 2010-06-12 | 2010-06-12 | Method for injecting carbon dioxide into blast furnace |
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| CN101871026A true CN101871026A (en) | 2010-10-27 |
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| CN 201010199232 Pending CN101871026A (en) | 2010-06-12 | 2010-06-12 | Method for injecting carbon dioxide into blast furnace |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103421914A (en) * | 2012-05-20 | 2013-12-04 | 符政学 | Iron making method introducing exhaust gas of hot-blast stove into blast furnace air |
| CN111635969A (en) * | 2020-05-07 | 2020-09-08 | 新兴铸管股份有限公司 | Treatment method for difficult blast furnace heat |
| CN113151622A (en) * | 2021-04-13 | 2021-07-23 | 东北大学 | Process for smelting vanadium-titanium magnetite by blast furnace |
| CN113718077A (en) * | 2021-09-27 | 2021-11-30 | 郑州豫兴热风炉科技有限公司 | Flue gas recycling system capable of realizing micro-emission of hot blast stove |
| DE102020212806A1 (en) | 2020-10-09 | 2022-04-14 | Thyssenkrupp Steel Europe Ag | Process for producing pig iron in a shaft furnace |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5579811A (en) * | 1978-12-09 | 1980-06-16 | Nippon Steel Corp | Controlling method for temperature in front of tuyere of blast furnace |
| JPS58500412A (en) * | 1981-03-11 | 1983-03-17 | サントル・ド・ルシエルシユ・メタリユルジユク | Method for injecting superheated reducing gas into a blast furnace |
| US4521246A (en) * | 1981-03-11 | 1985-06-04 | Centre De Recherches Metallurgiques-Centrum Voor Research In De Metallurgie | Operating a blast furnace with the injection of hot reducing gases |
| CN101000141A (en) * | 2006-12-28 | 2007-07-18 | 鞍钢股份有限公司 | Blast furnace coal injection method using flue gas of hot blast stove as carrier |
| CN101575653A (en) * | 2009-06-17 | 2009-11-11 | 北京大学 | Method and device for separating carbon dioxide to improve mass energy of blast furnace gas |
-
2010
- 2010-06-12 CN CN 201010199232 patent/CN101871026A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5579811A (en) * | 1978-12-09 | 1980-06-16 | Nippon Steel Corp | Controlling method for temperature in front of tuyere of blast furnace |
| JPS58500412A (en) * | 1981-03-11 | 1983-03-17 | サントル・ド・ルシエルシユ・メタリユルジユク | Method for injecting superheated reducing gas into a blast furnace |
| US4521246A (en) * | 1981-03-11 | 1985-06-04 | Centre De Recherches Metallurgiques-Centrum Voor Research In De Metallurgie | Operating a blast furnace with the injection of hot reducing gases |
| CN101000141A (en) * | 2006-12-28 | 2007-07-18 | 鞍钢股份有限公司 | Blast furnace coal injection method using flue gas of hot blast stove as carrier |
| CN101575653A (en) * | 2009-06-17 | 2009-11-11 | 北京大学 | Method and device for separating carbon dioxide to improve mass energy of blast furnace gas |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103421914A (en) * | 2012-05-20 | 2013-12-04 | 符政学 | Iron making method introducing exhaust gas of hot-blast stove into blast furnace air |
| CN111635969A (en) * | 2020-05-07 | 2020-09-08 | 新兴铸管股份有限公司 | Treatment method for difficult blast furnace heat |
| DE102020212806A1 (en) | 2020-10-09 | 2022-04-14 | Thyssenkrupp Steel Europe Ag | Process for producing pig iron in a shaft furnace |
| WO2022073751A1 (en) | 2020-10-09 | 2022-04-14 | Thyssenkrupp Steel Europe Ag | Method for producing pig iron in a shaft furnace |
| CN113151622A (en) * | 2021-04-13 | 2021-07-23 | 东北大学 | Process for smelting vanadium-titanium magnetite by blast furnace |
| CN113151622B (en) * | 2021-04-13 | 2022-04-01 | 东北大学 | Process for smelting vanadium-titanium magnetite by blast furnace |
| CN113718077A (en) * | 2021-09-27 | 2021-11-30 | 郑州豫兴热风炉科技有限公司 | Flue gas recycling system capable of realizing micro-emission of hot blast stove |
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Application publication date: 20101027 |