CN101182957A - Air gas primary heater unit of hot-air stove - Google Patents
Air gas primary heater unit of hot-air stove Download PDFInfo
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- CN101182957A CN101182957A CNA2007101906403A CN200710190640A CN101182957A CN 101182957 A CN101182957 A CN 101182957A CN A2007101906403 A CNA2007101906403 A CN A2007101906403A CN 200710190640 A CN200710190640 A CN 200710190640A CN 101182957 A CN101182957 A CN 101182957A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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Abstract
The invention provides an air and coal gas preheating device of an air heating furnace and comprises a combustion mixing furnace, an air heat interchanger, a coal gas heat interchanger and an assorted blower as well as a valve. A draft fan is adopted to lead waste gas in a flue of the air heating furnace into a mixing chamber of the combustion furnace and then waste gas is mixed with high temperature flue gas generated by the combustion furnace so that air and coal gas can be heated while mixed flue gas conducts heat exchanging. A high temperature air heat interchanger is added on the basis of the preheating device so that the preheating device can become a second preheating device; the second preheating device preheats air and coal gas with flue in the air heating furnace and then leads waste gas in the flue of the air heating furnace into the mixing chamber of the combustion furnace with the high temperature draft fan, moreover, waste gas is mixed with high temperature flue gas and combustion-supporting air is preheated secondly. The invention not only takes use of afterheat of large amount of low temperature waste gas, but also transforms coal gas with low thermal valve into wind temperature with high value, meanwhile, the invention preheats combustion-supporting air and has the advantages of compact structure, reasonable arrangement, low investment, low operation cost, etc.
Description
Technical field
The present invention relates to a kind of auxiliary device of hot-blast stove, particularly a kind of air, gas preheating device that has the hot-blast stove of additional combustion holding furnace.
Background technology
Along with the progress of ironmaking technology, the blast furnace feeding coke ratio descends year by year, causes the blast furnace gas calorific capacity to reduce, and general blast furnace gas calorific capacity is only at 3000KJ/m
3About, hot-blast stove single fire blast furnace gas wind-warm syndrome can only reach about 1000～1050 ℃, does not satisfy the needs of high wind-warm syndrome at all.Therefore, domestic iron-smelter has been taked a lot of measures for improving wind-warm syndrome, as: the coke-stove gas of multifuel combustion part higher calorific value, utilize hot-blast stove fume waste heat preheated air and coal gas or the like.Because iron and steel enterprise's higher calorific value coke-stove gas is generally not enough, and the temperature of stack gases is not too high, use the separate heat pipe technology can improve about 80～90 ℃ of wind-warm syndrome, still do not satisfy the needs of 1200 ℃ of high wind-warm syndrome about air, gas preheating to 140 ℃.Therefore, under hot-blast stove single fire blast furnace gas condition, realize 1200 ℃ of-1250 ℃ of high wind-warm syndrome, must ward off thermal source in addition, air, coal gas are preheating to respectively about 250-300 ℃ (or 450 ℃, 200 ℃).
Summary of the invention
Goal of the invention: purpose of the present invention just provides a kind of low-heat value gas and waste gas residual heat of utilizing and comes preheating gas and air, and improves the hot-blast stove air gas preheating device of wind-warm syndrome.
Technical scheme: hot-blast stove air gas preheating device of the present invention is divided into expression of first degree preheating device and secondary preheating device.
The expression of first degree preheating device comprises burning holding furnace, air heat exchanger, gas change heater and air-introduced machine and valve; The flue gas of hot-blast stove enters the mixing chamber of burning holding furnace by air-introduced machine, the high-temperature flue gas that produces with combustion furnace mixes, high-temperature flue gas through mixing enters gas change heater and air heat exchanger respectively by pipeline, respectively coal gas and the air that enters hot-blast stove is heated, and residual air enters chimney.
The quadratic expression preheating device comprises burning holding furnace, high temperature air heat exchanger, air heat exchanger, gas change heater and air-introduced machine and valve; The flue gas of hot-blast stove enters the mixing chamber of burning holding furnace by air-introduced machine, the high-temperature flue gas that produces with combustion furnace mixes, high-temperature flue gas through mixing enters the high temperature air heat exchanger by pipeline, enter gas change heater and air heat exchanger respectively by pipeline then, respectively coal gas and the air that enters hot-blast stove once heated, residual air enters chimney, and the air after air heat exchanger once heats enters high temperature air heat exchanger post bake by pipeline, enters hot-blast stove then.
Beneficial effect: the present invention not only makes the waste heat of a large amount of low temperature waste gas of Combustion of Hot Air Furnace generation effectively be utilized, and improves heat transfer boundary condition, and utilizes a certain amount of low combustion value furnace gas to be converted into the wind-warm syndrome of high value.Preheating device of the present invention is preheated air, coal gas simultaneously, the equipment of hot-blast stove body is adapted with it, the coal gas side of ceramic burner and the temperature difference of air side are reduced, overcome the breakage that ceramic burner causes greatly because of the temperature difference, the service life of having improved ceramic burner greatly.The present invention also has advantages such as compact equipment, rationally distributed, reduced investment, operating cost be low.
Description of drawings
Fig. 1 is a process structure schematic diagram of the present invention.
Fig. 2 is a segmented preheating device process structure schematic diagram.
Fig. 3 is a burning holding furnace sectional structure schematic diagram.
The specific embodiment
Embodiment 1: as shown in Figure 1, this pre-heating system is the expression of first degree preheating device, wherein 1 for burning holding furnace, 2 be that gas change heater, 3 is chimney for hot-blast stove, 8 for control valve, 7 for valve, 6 for air-introduced machine, 5 for air heat exchanger, 4.Preheating device air heat exchanger and gas change heater adopt tubular type, waste gas of hot-blast stove flue is introduced (see figure 3) in the mixing chamber on burning holding furnace top with high temperature draught fan, the high-temperature flue gas that produces with the burning holding furnace mixes, make the mixed flue gas temperature reach 500-600 ℃, mixed high-temperature flue gas enters air heat exchanger and gas change heater respectively, through exchange heat, make the air, the coal gas that enter hot-blast stove be heated to 300 ℃, residual air enters chimney.
The burning holding furnace is a vertical barrel type, and there is the grid tap hole centre, and the bottom is provided with the grid type burner.
Send into the coal gas and the air of hot-blast stove through gas change heater and air heat exchanger, between the inlet and outlet piping of gas change heater and air heat exchanger, be provided with the bypass pipe that has valve.
Embodiment 2: as shown in Figure 2, this pre-heating system is the quadratic expression preheating device, or the segmented preheating device, and wherein 9 is the high temperature air heat exchanger, and all the other labels are identical with embodiment 1.
The segmented preheating device also is to adopt shell and tube (tube bank is light pipe, soaks aluminium through high temperature, and is high temperature resistant, corrosion-resistant) air heat exchanger and gas change heater, utilizes hot-blast stove fume with air, gas preheating to 200 ℃ earlier; Waste gas of hot-blast stove flue is introduced (see figure 3) in the mixing chamber on burning holding furnace top with smoke induced draught fan then, the high-temperature flue gas that produces with the burning holding furnace mixes, make the mixed flue gas temperature reach 550-700 ℃, will be preheating to 200 ℃ combustion air secondary by the high temperature air heat exchanger again with this flue gas and be preheating to 450 ℃; Make air, coal gas be heated to 450 ℃ respectively, 200 ℃.Flue gas after the preheating directly enters chimney by flue.
Claims (6)
1. the air gas preheating device of a hot-blast stove is characterized in that: it comprises burning holding furnace, air heat exchanger, gas change heater and air-introduced machine and valve; The flue gas of hot-blast stove enters the mixing chamber of burning holding furnace by air-introduced machine, the high-temperature flue gas that produces with combustion furnace mixes, high-temperature flue gas through mixing enters gas change heater and air heat exchanger respectively by pipeline, respectively coal gas and the air that enters hot-blast stove is heated, and residual air enters chimney.
2. the air gas preheating device of hot-blast stove according to claim 1, it is characterized in that: described air heat exchanger and gas change heater are respectively the air heat exchanger and the gas change heater of shell and tube.
3. the air gas preheating device of hot-blast stove according to claim 1, it is characterized in that: described burning holding furnace is a vertical barrel type, and there is the grid tap hole centre, and the bottom is provided with the grid type burner.
4. the air gas preheating device of hot-blast stove according to claim 1 and 2 is characterized in that: send into the gas piping of hot-blast stove through gas change heater, be provided with the bypass pipe that has valve between the inlet and outlet piping of gas change heater.
5. the air gas preheating device of hot-blast stove according to claim 1 and 2 is characterized in that: send into the air duct of hot-blast stove through air heat exchanger, be provided with the bypass pipe that has valve between the inlet and outlet piping of air heat exchanger.
6. the air gas preheating device of a hot-blast stove is characterized in that: it comprises burning holding furnace, high temperature air heat exchanger, air heat exchanger, gas change heater and air-introduced machine and valve; The flue gas of hot-blast stove enters the mixing chamber of burning holding furnace by air-introduced machine, the high-temperature flue gas that produces with combustion furnace mixes, high-temperature flue gas through mixing enters the high temperature air heat exchanger by pipeline, enter gas change heater and air heat exchanger respectively by pipeline then, respectively coal gas and the air that enters hot-blast stove once heated, residual air enters chimney, and the air after air heat exchanger once heats enters high temperature air heat exchanger post bake by pipeline, enters hot-blast stove then.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101906403A CN101182957A (en) | 2007-11-27 | 2007-11-27 | Air gas primary heater unit of hot-air stove |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101906403A CN101182957A (en) | 2007-11-27 | 2007-11-27 | Air gas primary heater unit of hot-air stove |
Publications (1)
| Publication Number | Publication Date |
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| CN101182957A true CN101182957A (en) | 2008-05-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2007101906403A Pending CN101182957A (en) | 2007-11-27 | 2007-11-27 | Air gas primary heater unit of hot-air stove |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041337A (en) * | 2011-01-13 | 2011-05-04 | 北京首钢国际工程技术有限公司 | Multi-purpose system for high-temperature preheating of hot blast furnace combustion-supporting air |
| CN102181871A (en) * | 2011-04-01 | 2011-09-14 | 北京首钢国际工程技术有限公司 | Heating and corrosion-prevention method for gas pipeline of hot blast stove |
| CN102322692A (en) * | 2011-05-30 | 2012-01-18 | 湖南科技大学 | Tail gas heat utilization method for low-concentration gas heat countercurrent catalytic oxidation apparatus |
| CN103697587A (en) * | 2013-11-29 | 2014-04-02 | 山西新聚星锅炉有限公司 | Indirect fuel-gas hot-air boiler |
| CN108344287A (en) * | 2018-02-13 | 2018-07-31 | 国家粮食局科学研究院 | A kind of energy-saving and environment-friendly scale grain heat-drying complexes and furnace drying method |
| CN112484062A (en) * | 2020-10-27 | 2021-03-12 | 中冶南方都市环保工程技术股份有限公司 | Energy-saving and emission-reducing system for tail flue gas of gas boiler |
| WO2022088687A1 (en) * | 2020-10-27 | 2022-05-05 | 中冶南方都市环保工程技术股份有限公司 | Air and coal gas parallel connection integrated flue gas temperature reducing and energy saving device for coal gas boiler |
| CN114777334A (en) * | 2022-05-25 | 2022-07-22 | 中冶赛迪工程技术股份有限公司 | Combined gas heating system and heating method |
-
2007
- 2007-11-27 CN CNA2007101906403A patent/CN101182957A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102041337A (en) * | 2011-01-13 | 2011-05-04 | 北京首钢国际工程技术有限公司 | Multi-purpose system for high-temperature preheating of hot blast furnace combustion-supporting air |
| CN102181871A (en) * | 2011-04-01 | 2011-09-14 | 北京首钢国际工程技术有限公司 | Heating and corrosion-prevention method for gas pipeline of hot blast stove |
| CN102181871B (en) * | 2011-04-01 | 2012-11-14 | 北京首钢国际工程技术有限公司 | Heating and corrosion-prevention method for gas pipeline of hot blast stove |
| CN102322692A (en) * | 2011-05-30 | 2012-01-18 | 湖南科技大学 | Tail gas heat utilization method for low-concentration gas heat countercurrent catalytic oxidation apparatus |
| CN103697587A (en) * | 2013-11-29 | 2014-04-02 | 山西新聚星锅炉有限公司 | Indirect fuel-gas hot-air boiler |
| CN108344287A (en) * | 2018-02-13 | 2018-07-31 | 国家粮食局科学研究院 | A kind of energy-saving and environment-friendly scale grain heat-drying complexes and furnace drying method |
| CN108344287B (en) * | 2018-02-13 | 2023-11-10 | 国家粮食局科学研究院 | Energy-saving and environment-friendly large-scale grain drying complete device and drying method |
| CN112484062A (en) * | 2020-10-27 | 2021-03-12 | 中冶南方都市环保工程技术股份有限公司 | Energy-saving and emission-reducing system for tail flue gas of gas boiler |
| WO2022088687A1 (en) * | 2020-10-27 | 2022-05-05 | 中冶南方都市环保工程技术股份有限公司 | Air and coal gas parallel connection integrated flue gas temperature reducing and energy saving device for coal gas boiler |
| WO2022088686A1 (en) * | 2020-10-27 | 2022-05-05 | 中冶南方都市环保工程技术股份有限公司 | Gas boiler tail flue gas energy-saving and emission-reduction system |
| CN114777334A (en) * | 2022-05-25 | 2022-07-22 | 中冶赛迪工程技术股份有限公司 | Combined gas heating system and heating method |
| CN114777334B (en) * | 2022-05-25 | 2024-05-07 | 中冶赛迪工程技术股份有限公司 | Combined gas heating system and heating method |
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