CN1053701C - Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air - Google Patents
Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air Download PDFInfo
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- CN1053701C CN1053701C CN97105051A CN97105051A CN1053701C CN 1053701 C CN1053701 C CN 1053701C CN 97105051 A CN97105051 A CN 97105051A CN 97105051 A CN97105051 A CN 97105051A CN 1053701 C CN1053701 C CN 1053701C
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Abstract
The present invention discloses a technical method for the double preheating of the coal gases of a hot air furnace of a blast furnace and combustion supporting air. The present invention is characterized in that a blast furnace gas and combustion supporting air are processed by mixed combustion through a combustion furnace. A combusted waste gas is transferred to a mixer and is mixed with a hot air furnace coal gas and a waste gas generated by the combustion of the combustion supporting air in a mixer. Mixed waste gases are respectively introduced to a preheater of coal gas and combustion supporting air for preheating the coal gas and the combustion supporting air. The temperature of the coal gas and the combustion supporting air reaches 300 DEG C, and wind temperature is increased by 200 to 250 DEG C. An iron-coke ratio per ton is reduced by 40 to 50kg, an iron yield is increased by 8 to 10%, and a coal injection quantity is increased by 100 to 125kg. The present invention solves the dispersal problem of the blast furnace gases and reduces environment pollution.
Description
The present invention relates to a kind of technical field of gas converting heat, particularly the processing method of blast-furnace hot-air producer gas, the two preheatings of combustion air.
In blast furnace iron-making process, an energy-saving and cost-reducing valid approach be exactly improve blast furnace go into the stove wind-warm syndrome.The improvement of wind-warm syndrome can improve combustion intensity, reduce ratio of putting coke into furnace, and ton iron energy consumption is reduced, and can also increase the iron amount of producing.But along with the fuel ratio of blast furnace reduces significantly, the calorific value of blast furnace gas progressively reduces (＜3000KJ/m
3), if do not adopt an additive method burning blast-furnace gas, can't reach higher blast furnace air temperature.At present,, adopt and in blast furnace gas, mix a certain amount of coke-oven gas, perhaps with the method for combustion heat wind furnace, improve the theoretical combustion temperature of blast furnace gas, to reach the purpose that improves wind-warm syndrome with coal gas, combustion air preheating for improving blast furnace air temperature.Because coke-oven gas is relatively more nervous, the processing method of current more employing preheating gas or combustion air improves blast furnace air temperature.
In iron and steel enterprise, high heating value gas (mainly being coke-oven gas) is very nervous, and low-heat value gas (mainly being blast furnace gas) has residue, and remaining blast furnace gas often directly is disposed in the atmosphere, this not only causes the waste of the energy, and has polluted environment.
The purpose of this invention is to provide a kind of blast furnace gas that diffuses that makes full use of, utilize the roasting kiln of burning blast furnace gas, the high-temperature flue gas of generation makes coal gas, the two preheatings of combustion air and obtains the processing method of higher blast furnace air temperature.
Technical scheme of the present invention is that two kinds of methods of branch solve.
Method 1:
The processing method of a kind of blast-furnace hot-air producer gas, the two preheatings of combustion air, it is characterized in that: blast furnace gas divides two pipelines to send, a pipeline passes to the gas preheating device, preheating is after gas holder is sent into hot-blast stove gas burner, and blast furnace gas is delivered to roasting kiln and combustion air mixed firing by another root pipeline; From the combustion air that gas blower comes, a part is sent into the burner of roasting kiln by pipeline, and a part is sent into air preheater, delivers to the air gas bag after the air preheater preheating, delivers to hot-blast stove gas burner through the air gas bag; Waste gas of hot-blast stove flue, a part is delivered to smoke stack emission, a part is delivered to mixing tank through other flue and is mixed in mixing tank with the combustion air waste gas after burning with roasting kiln coal gas, after mixed waste gas was sent into coal gas, combustion air preheater preheating gas and combustion air respectively, two portions waste gas was delivered to the flue discharging through induced draft fan.
Method 2:
The processing method of a kind of blast-furnace hot-air producer gas, the two preheatings of combustion air, it is characterized in that: a (see figure 2) blast furnace gas part causes roasting kiln and air preheater by pipeline, burn with the air mixed that gas blower attracts, a part causes the gas preheating device by the road, after the preheating of gas preheating device, deliver to the coal gas gas bag, deliver to hot-blast stove gas burner through gas bag; Combustion air causes roasting kiln with gas blower and air preheater separates two pipelines, a pipeline is delivered to roasting kiln and air preheater and blast furnace gas and is blended in roasting kiln and air preheater combustion chamber internal combustion, another root pipeline send air is to the radiation recuperator of roasting kiln and air preheater, combustion air after the preheating is delivered to the air gas bag, delivers to hotblast stove through gas bag.Roasting kiln and air preheater waste gas after burning are delivered to one-level gas preheating device preheating gas by the road, behind one-level gas preheating device, mix with the part waste gas of hot-blast stove flue, enter secondary gas preheating device preheating gas, the flue gas that goes out secondary gas preheating device causes smoke stack emission with induced draft fan; Hotblast stove coal gas and combustion air waste gas after burning, a part is delivered to smoke stack emission through flue collector, and another part is delivered to the gas preheating device through other flue.
Advantage of the present invention is to adopt the coal gas of Combustion of Hot Air Furnace, two pre-heating means of combustion air, can make the temperature of coal gas, combustion air reach 300 ℃, improve 200-250 ℃ of blast furnace air temperature, can reduce iron coke per ton ratio 40-50kg, increase and produce iron amount 8-10%, increase injecting coal quantity 100-125Kg, also solved the problem of diffusing of blast furnace gas.Less investment, instant effect, reduced environmental pollution.
Fig. 1 is the two pre-heating technique schemas of roasting kiln formula.
Fig. 2 is the two pre-heating technique schemas of roasting kiln and air preheater formula.
Embodiment 1
Present embodiment 1 is (see figure 1)s of implementing like this for the two pre-heating technique flow processs of roasting kiln formula.Blast furnace gas divides two pipelines to send, and a pipeline passes to the gas preheating device, and by 40 ℃ of gas temperatures, gas temperature reaches 300 ℃ after the preheating, sends into hot-blast stove gas burner through gas holder, and another root pipeline of blast furnace gas is delivered to roasting kiln and combustion air mixed firing.The combustion air temperature of coming from gas blower is 20 ℃, and a part is sent into the burner of roasting kiln by pipeline, and a part is sent into air preheater, and combustion air temperature is 300 ℃ and delivers to the air gas bag behind air preheater, delivers to hot-blast stove gas burner through the air gas bag.250 ℃ of hotblast stove coal gas and combustion air waste gas after burning temperature, a part is delivered to smoke stack emission, it is that 1250 ℃ roasting kiln coal gas mixes in mixing tank with the combustion air waste gas after burning that a part is delivered to mixing tank and temperature through other flue, mixed spent air temperture is 600 ℃, mixed waste gas is sent into coal gas, combustion air preheater preheating gas and combustion air respectively, spent air temperture is reduced to 170 ℃, and two portions waste gas is delivered to the flue discharging through induced draft fan.
Embodiment 2
Present embodiment 2 is that the two pre-heating technique flow processs of roasting kiln and air preheater formula are (see figure 2)s of implementing like this.Temperature is that a blast furnace gas part of 40 ℃ causes roasting kiln and air preheater by pipeline, burns with the air mixed that gas blower attracts; A part causes one-level gas preheating device by the road, temperature is 100 ℃ and enters the preheating of secondary gas preheating device after the preheating of one-level gas preheating device, temperature reaches 300 ℃ and delivers to the coal gas gas bag after the preheating of secondary gas preheating device, and coal gas is delivered to hot-blast stove gas burner through gas bag.The combustion air that temperature is 20 ℃ causes roasting kiln with gas blower and air preheater separates two pipelines, a pipeline is delivered to roasting kiln and air preheater and blast furnace gas and is blended in roasting kiln and air preheater combustion chamber internal combustion, another root pipeline send air is to the radiation recuperator of roasting kiln and air preheater, combustion air temperature after the preheating is 300 ℃ and delivers to the air gas bag, deliver to hot-blast stove gas burner through gas bag, roasting kiln and air preheater waste gas after burning temperature are 700 ℃ and deliver to secondary gas preheating device by the road, to reduce to 250 ℃ be that 250 ℃ waste gas of hot-blast stove flue mixes with portion temperature to flue-gas temperature behind secondary gas preheating device, enter one-level gas preheating device preheating gas, go out flue-gas temperature behind the one-level gas preheating device and be 170 ℃ and cause smoke stack emission with induced draft fan; 250 ℃ of hotblast stove coal gas and combustion air waste gas after burning temperature, a part is delivered to smoke stack emission through flue collector, and another part is delivered to the gas preheating device through other flue.
Claims (2)
1. the processing method of a blast-furnace hot-air producer gas, the two preheatings of combustion air, it is characterized in that: blast furnace gas divides two pipelines to send, a pipeline passes to the gas preheating device, preheating is after gas holder is sent into hot-blast stove gas burner, and blast furnace gas is delivered to roasting kiln and combustion air mixed firing by another root pipeline; From the combustion air that gas blower comes, a part is sent into the burner of roasting kiln by pipeline, and a part is sent into air preheater, delivers to the air gas bag after the air preheater preheating, delivers to hot-blast stove gas burner through the air gas bag; Waste gas of hot-blast stove flue, a part is delivered to smoke stack emission, a part is delivered to mixing tank through other flue and is mixed in mixing tank with the combustion air waste gas after burning with roasting kiln coal gas, after mixed waste gas was sent into coal gas, combustion air preheater preheating gas and combustion air respectively, two portions waste gas was delivered to the flue discharging through induced draft fan.
2. the processing method of a blast-furnace hot-air producer gas, the two preheatings of combustion air, it is characterized in that: a blast furnace gas part causes roasting kiln and air preheater by pipeline, burn with the air mixed that gas blower attracts, a part causes the gas preheating device by the road, after the preheating of gas preheating device, deliver to the coal gas gas bag, deliver to hot-blast stove gas burner through gas bag; Combustion air causes roasting kiln with gas blower and air preheater separates two pipelines, a pipeline is delivered to roasting kiln and air preheater and blast furnace gas and is blended in roasting kiln and air preheater combustion chamber internal combustion, another root pipeline send air is to the radiation recuperator of roasting kiln and air preheater, combustion air after the preheating is delivered to the air gas bag, delivers to hotblast stove through gas bag; Roasting kiln and air preheater waste gas after burning are delivered to one-level gas preheating device preheating gas by the road, behind one-level gas preheating device, mix with the part waste gas of hot-blast stove flue, enter secondary gas preheating device preheating gas, the flue gas that goes out secondary gas preheating device causes smoke stack emission with induced draft fan; Hotblast stove coal gas and combustion air waste gas after burning, a part is delivered to smoke stack emission through flue collector, and another part is delivered to the gas preheating device through other flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97105051A CN1053701C (en) | 1997-01-24 | 1997-01-24 | Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN97105051A CN1053701C (en) | 1997-01-24 | 1997-01-24 | Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air |
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| Publication Number | Publication Date |
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| CN1188808A CN1188808A (en) | 1998-07-29 |
| CN1053701C true CN1053701C (en) | 2000-06-21 |
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| CN97105051A Expired - Fee Related CN1053701C (en) | 1997-01-24 | 1997-01-24 | Technology for double preheating by using blast-furnace hot-blast stove gas, and combustion-supporting air |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296495C (en) * | 2004-05-10 | 2007-01-24 | 四川大学 | High wind temperature obtaining method using pure blast furnace gas combustion |
| CN102538491A (en) * | 2012-01-31 | 2012-07-04 | 首钢总公司 | System and method utilizing flue duct waste gas of hot air furnace to bake and preheat charging of blast furnace |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102618682A (en) * | 2011-01-31 | 2012-08-01 | 杭州三花研究院有限公司 | Blast furnace hot-blast stove combustion air preheating system and preheating method |
| CN103131814A (en) * | 2011-12-01 | 2013-06-05 | 上海雷林工程技术有限公司 | Coal gas and air synchronous double-preheating system with additionally arranged combustion furnace |
| CN102748757B (en) * | 2012-07-04 | 2014-12-24 | 梁嘉键 | Energy-saving device capable of preheating coal gas on ceramic kiln |
| CN103244439A (en) * | 2013-04-23 | 2013-08-14 | 中冶南方工程技术有限公司 | Utilization system and method of blast furnace hot blast stove combustion emission for blast furnace electric blower |
| CN103320561A (en) * | 2013-06-08 | 2013-09-25 | 中冶南方工程技术有限公司 | Hot-blast stove system for high air temperature by using pure blast furnace gas and method thereof |
| CN104726692A (en) * | 2015-04-03 | 2015-06-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for improving reduction temperature of iron ore in shaft furnace magnetizing roasting |
| CN105238901B (en) * | 2015-09-30 | 2017-12-29 | 北京首钢国际工程技术有限公司 | A kind of multiduty hot-blast stove high temperature preheating system |
| CN115491452B (en) * | 2022-08-30 | 2023-09-26 | 鞍钢股份有限公司 | Production method for reducing emission concentration of nitrogen oxides in flue gas of blast furnace hot blast stove |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5122603A (en) * | 1974-08-21 | 1976-02-23 | Komatsu Mfg Co Ltd | NETSUPUKYUHORANIOKERU NETSUKO KANSOCHI |
| JPS6267107A (en) * | 1985-09-17 | 1987-03-26 | Sumitomo Metal Ind Ltd | Method for recovering waste heat of hot stove |
| CN2045388U (en) * | 1989-01-05 | 1989-10-04 | 鞍山钢铁公司 | Cas preheating device for blast furnace hot blast stove |
| RO108807B (en) * | 1992-02-20 | 1994-08-30 | Doru Tatar | Combustible fluids preheating process and plant |
-
1997
- 1997-01-24 CN CN97105051A patent/CN1053701C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5122603A (en) * | 1974-08-21 | 1976-02-23 | Komatsu Mfg Co Ltd | NETSUPUKYUHORANIOKERU NETSUKO KANSOCHI |
| JPS6267107A (en) * | 1985-09-17 | 1987-03-26 | Sumitomo Metal Ind Ltd | Method for recovering waste heat of hot stove |
| CN2045388U (en) * | 1989-01-05 | 1989-10-04 | 鞍山钢铁公司 | Cas preheating device for blast furnace hot blast stove |
| RO108807B (en) * | 1992-02-20 | 1994-08-30 | Doru Tatar | Combustible fluids preheating process and plant |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1296495C (en) * | 2004-05-10 | 2007-01-24 | 四川大学 | High wind temperature obtaining method using pure blast furnace gas combustion |
| CN102538491A (en) * | 2012-01-31 | 2012-07-04 | 首钢总公司 | System and method utilizing flue duct waste gas of hot air furnace to bake and preheat charging of blast furnace |
| CN102538491B (en) * | 2012-01-31 | 2013-10-30 | 首钢总公司 | System and method utilizing flue duct waste gas of hot air furnace to bake and preheat charging of blast furnace |
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| Publication number | Publication date |
|---|---|
| CN1188808A (en) | 1998-07-29 |
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