CN2055137U - Coal-burning hot-blast stove with flue gas partial recirculation - Google Patents

Coal-burning hot-blast stove with flue gas partial recirculation Download PDF

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Publication number
CN2055137U
CN2055137U CN 89202099 CN89202099U CN2055137U CN 2055137 U CN2055137 U CN 2055137U CN 89202099 CN89202099 CN 89202099 CN 89202099 U CN89202099 U CN 89202099U CN 2055137 U CN2055137 U CN 2055137U
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CN
China
Prior art keywords
temperature
flue
heat
flue gas
coal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
CN 89202099
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Chinese (zh)
Inventor
张世伟
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Individual
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Individual
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Priority to CN 89202099 priority Critical patent/CN2055137U/en
Publication of CN2055137U publication Critical patent/CN2055137U/en
Withdrawn legal-status Critical Current

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Abstract

The utility model relates to a coal-burning hot-blast furnace which is provided with a pipeline with an adjusting valve, and an exit flue behind a draught fan is communicated with a high-temperature flue in front of a heat exchanger by the pipeline. The exhaust fume in low temperature comes back into the high-temperature flue through the pipeline under the action of the draught fan and mixes with the high-temperature fume in the high-temperature flue, and the temperature of the fume entering into the heat exchanger is reduced, thereby, the temperature of a heat exchanging surface is reduced. The temperature of the heat exchanging surface can be ultimately kept within the safe temperature range of the material of the heat exchanging surface by altering the opening degree of the valve.

Description

Coal-burning hot-blast stove with flue gas partial recirculation
The utility model is the utility model about the Coalhotairfurnace of partition heat exchange.Hotblast stove is gas heating stove just, for example air-heating furnace.In Coalhotairfurnace, the temperature of flue gas can reach Celsius 1,000 hundreds of degree, and the coefficient of heat transfer of the coefficient of heat transfer of hot blast side and fume side is more or less the same, so the temperature of high-temperature zone heat exchange surface is very high, to such an extent as to the ordinary steel iron material is difficult to bear.Existing solution is to adopt the high temperature heat-transfer surface of heating resisting metal material as hotblast stove, and this raises the cost of hotblast stove greatly.In addition, this method still can be subjected to the restriction of the thermal stability of heating resisting metal material under certain conditions.Existing another kind of solution is to adopt the high temperature heat-transfer surface of the higher refractory materials of thermal conductivity as hotblast stove, for example high alumina refractory, carborundum refractory etc.Because the refractoriness of these refractory materialss is very high, so can not be subjected to the restriction of refractoriness.But because refractory materials intensity is low, do not have the workability of metallic substance, so this heat-transfer surface manufacturing, structure are all very complicated, stopping property is also relatively poor, also is easy in addition burst.Also having a kind of solution in addition is to strengthen the incendiary coefficient of excess air, and the temperature of flue gas is reduced, thereby reduces the temperature of high temperature heat-transfer surface, makes it to remain in the safety temperature scope of heat-transfer surface material.The shortcoming of this method is to have increased exhaust smoke level when reducing flue-gas temperature, has reduced the thermo-efficiency of hotblast stove, has wasted the energy.The method of reduction flue-gas temperature such as water spray, spray vapour in flue gas also has with the identical shortcoming of this method more for another example, has wasted the energy.
It is constant that task of the present utility model provides a kind of thermo-efficiency that can either keep, and can regulate the temperature of high temperature heat-transfer surface again neatly, makes it to remain on the interior hotblast stove of safety temperature scope of fixed heat-transfer surface material.
Accompanying drawing 1 is the Coalhotairfurnace with flue gas recirculation part.High-temperature flue 1 before exit flue 4 after this hotblast stove has a pipeline 5 with hotblast stove induced draft fan 3 and the heat exchanger of hotblast stove 2 is communicated with, under the effect of induced draft fan, the low-temperature flue gas of having discharged heat exchanger partly, again flow back in the flue before the heat exchanger by this pipeline, and with the there high-temperature flue gas mix, the flue-gas temperature that enters in the heat exchanger is reduced, thereby reduced the temperature of heat-transfer surface.
This connecting pipe is equipped with a variable valve 6, by this variable valve, can change the exhaust gas volumn of recirculation, thereby changes the flue-gas temperature that enters in the interchanger, and the temperature of finally regulating heat-transfer surface makes it to remain in the safety temperature scope of heat-transfer surface material.Because the final clean exhaust smoke level of hotblast stove does not change, so the thermo-efficiency of hotblast stove does not also change.In the accompanying drawing 1 is flue before the interchanger, the 2nd, and interchanger, the 3rd, induced draft fan, the 4th, exit flue, the 5th, recirculating gas duct, the 6th, variable valve, the 7th, combustion chamber, the 8th, chimney.
The utility model also has certain shortcoming, and Here it is owing to reduced the temperature that enters the flue gas in the heat exchanger, thereby also reduced heat transfer temperature difference, thereby must increase heat interchanging area, and the material that heat-transfer surface is consumed increases.But, exceed under the not very big situation of the safety temperature of heat-transfer surface material in the temperature of high temperature heat-transfer surface, by the method for this partial fume recirculation, allow an amount of flue gas carry out recirculation and reduce the temperature of heat-transfer surface, be a kind of economy, simple and effective method.In addition, in many cases, by the recirculation of flue gas part, can use the heating resisting metal material, even can use the heat-transfer surface of ordinary steel iron material as hotblast stove, although this will increase heat interchanging area, the material that the hotblast stove heat-transfer surface is consumed increases, but, the cost of hotblast stove is reduced significantly because price is much lower.

Claims (2)

1, Coalhotairfurnace with combustion chamber, metallic recuperator, hot air circulation blower, induced draft fan and chimney, the exit flue after it is characterized in that having the bar pipeline with induced draft fan is communicated with the flue before the heat exchanger.
2, hotblast stove as claimed in claim 1 is characterized in that this connecting pipe has the valve that can regulate aperture.
CN 89202099 1989-02-28 1989-02-28 Coal-burning hot-blast stove with flue gas partial recirculation Withdrawn CN2055137U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN 89202099 CN2055137U (en) 1989-02-28 1989-02-28 Coal-burning hot-blast stove with flue gas partial recirculation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN 89202099 CN2055137U (en) 1989-02-28 1989-02-28 Coal-burning hot-blast stove with flue gas partial recirculation

Publications (1)

Publication Number Publication Date
CN2055137U true CN2055137U (en) 1990-03-28

Family

ID=4859893

Family Applications (1)

Application Number Title Priority Date Filing Date
CN 89202099 Withdrawn CN2055137U (en) 1989-02-28 1989-02-28 Coal-burning hot-blast stove with flue gas partial recirculation

Country Status (1)

Country Link
CN (1) CN2055137U (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103088178A (en) * 2013-03-04 2013-05-08 江苏沙钢集团有限公司 Blast furnace hot-blast stove flue gas self-circulation combustion method and system
CN109028985A (en) * 2018-07-13 2018-12-18 哈尔滨锅炉厂有限责任公司 Large-scale storage tank high-temperature gas recycles pre-heating system and circulation pre-heating mean

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103088178A (en) * 2013-03-04 2013-05-08 江苏沙钢集团有限公司 Blast furnace hot-blast stove flue gas self-circulation combustion method and system
CN103088178B (en) * 2013-03-04 2014-09-10 江苏沙钢集团有限公司 Blast furnace hot-blast stove flue gas self-circulation combustion method and system
CN109028985A (en) * 2018-07-13 2018-12-18 哈尔滨锅炉厂有限责任公司 Large-scale storage tank high-temperature gas recycles pre-heating system and circulation pre-heating mean

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C19 Lapse of patent right due to non-payment of the annual fee
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