CN210197339U - Combined system for effectively relieving blockage of ammonium bisulfate of air preheater - Google Patents

Combined system for effectively relieving blockage of ammonium bisulfate of air preheater Download PDF

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Publication number
CN210197339U
CN210197339U CN201920812581.7U CN201920812581U CN210197339U CN 210197339 U CN210197339 U CN 210197339U CN 201920812581 U CN201920812581 U CN 201920812581U CN 210197339 U CN210197339 U CN 210197339U
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air
outlet
air heater
air preheater
steam
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CN201920812581.7U
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Inventor
Linhu Qi
齐林虎
Hongying Liu
刘红英
Jian Sun
孙健
Xirui Zhang
张西锐
Xinyuan Huang
黄新元
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SHANDONG HONGAO ELECTRIC POWER TECHNOLOGY Co Ltd
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SHANDONG HONGAO ELECTRIC POWER TECHNOLOGY Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

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  • Chimneys And Flues (AREA)

Abstract

The utility model relates to a power plant boiler air preheater operation safety technical field, in particular to effectively alleviate combined system of air preheater ammonium bisulfate jam. This effectively alleviate air preheater ammonium bisulfate combined system who blocks up, its characterized in that: a preposed smoke cooler is arranged in a flue between the outlet of the air preheater and the inlet of the MGGH smoke cooler, a steam air heater is arranged in a cold air channel at the outlet of the air feeder, and a hydrophily air heater is arranged in a cold air channel between the outlet of the steam air heater and the inlet of the air preheater; the hydrophily type air heater is respectively communicated with a water inlet and a water outlet of the preposed smoke cooler through a water inlet main pipe and a water return main pipe. The utility model discloses can improve air heater's cold junction comprehensive temperature, effectively alleviate air heater ammonium bisulfate and block up, can improve MGGH flue gas cooler's import gas temperature again, reduce the extra steam consumption of MGGH system.

Description

Combined system for effectively relieving blockage of ammonium bisulfate of air preheater
(I) technical field
The utility model relates to a power plant boiler air preheater operation safety technical field, in particular to effectively alleviate combined system of air preheater ammonium bisulfate jam.
(II) background of the invention
At present, the smoke discharge temperature of part of coal-fired boilers is lower than the design value, so that the problems of reduction of the comprehensive temperature of the cold end of an air preheater, aggravation of ammonium bisulfate corrosion and blockage, reduction of the energy level of smoke waste heat, increase of the power consumption of a draught fan and the like are caused. Especially for a unit provided with an MGGH system, the flue gas waste heat at the outlet of the air preheater is simply utilized, so that the flue gas temperature at the outlet of the desulfurizing tower cannot be increased to a designed value, and a large amount of auxiliary steam needs to be additionally input to maintain the flue gas temperature at the inlet of the chimney.
Disclosure of the invention
The utility model discloses a remedy prior art not enough, provide a simple structure, reasonable in design's the combined system that effectively alleviates air preheater ammonium bisulfate and blocks up.
The utility model discloses a realize through following technical scheme:
a combined system for effectively relieving blockage of an air preheater by ammonium bisulfate comprises a preposed flue gas cooler arranged between an outlet of an air preheater and an inlet flue of an MGGH flue gas cooler and used for absorbing waste heat of flue gas; the steam air heater is arranged in a cold air channel at the outlet of the air feeder and is used for heating air supplied by the boiler; and the hydrophily type air heater is arranged between the outlet of the steam air heater and the inlet air duct of the air preheater and is used for further improving the air supply temperature of the boiler.
The utility model adopts the preposed smoke cooler combined with the hydrophily type air heater and the steam air heater to heat the air supplied by the boiler. The steam air heater adopts a rotary type, can be adjusted according to the environmental temperature and the unit load, and reduces the power consumption of the fan; the preposed smoke cooler recovers part of smoke waste heat and forms a closed circulation system with the water medium type air heater. The exhaust gas temperature is increased by increasing the inlet air temperature of the air preheater, so that the heat transfer temperature difference of the preposed smoke cooler is increased, and the waste heat of low-temperature smoke is recovered more effectively; on the other hand, the comprehensive temperature of the cold end of the air preheater is greatly increased, and the blockage and corrosion of the ammonium bisulfate of the air preheater are effectively relieved; meanwhile, the steam consumption of the MGGH system is reduced by improving the temperature of the smoke at the inlet of the MGGH smoke cooler, and the coal consumption of unit power supply is reduced.
The utility model discloses a more excellent technical scheme does:
the inlet of the steam air heater is connected with a steam pipe, and the outlet of the steam air heater is connected with a drain pipe. The steam pipe is provided with an electric regulating valve, and the drain pipe is provided with a drain gate valve; the cold air is primarily heated by the steam air heater.
And a water inlet main pipe of the preposed smoke cooler is provided with a circulating water pump to provide power for the circulating operation of the exchange water between the preposed smoke cooler and the hydrophily type air heater.
An MGGH flue gas cooler, an electric dust remover, an induced draft fan, an absorption tower, a flue gas reheater and a chimney are sequentially arranged in a flue at the outlet of the preposed flue gas cooler along the flow direction of flue gas; and a heat medium heater and a pipeline for installing a circulating water pump are connected between the flue gas reheater and the MGGH flue gas cooler, so that the operation of the MGGH system is realized.
In the utility model, auxiliary steam enters the steam air heater through the steam pipe to heat the boiler for air supply, the steam pipe is designed with an electric regulating valve, and the outlet air temperature of the steam air heater is controlled through the electric regulating valve; circulating water enters the preposed smoke cooler through the circulating water pump, enters the hydrophily type air heater after absorbing the heat of smoke, is supplied by the secondary heating boiler, and then circulates, and the inlet air temperature of the air preheater is controlled through the variable frequency circulating pump.
The utility model can not only improve the comprehensive temperature of the cold end of the air preheater, effectively relieve the blockage of the ammonium bisulfate of the air preheater, but also improve the inlet smoke temperature of the MGGH smoke cooler and reduce the extra steam consumption of the MGGH system; meanwhile, after the blockage of the ammonium bisulfate in the original air preheater is relieved, the heat exchange performance is enhanced, the boiler efficiency is improved, the power consumption of the induced draft fan is reduced, and better economic benefit can be obtained.
(IV) description of the drawings
The present invention will be further described with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of the present invention.
In the figure, 1 circulating water pump, 2 water inlet main pipe, 3 preposed smoke cooler, 4 water return main pipe, 5 hydrophily type air heater, 6 steam pipe, 7 electric regulating valve, 8 steam air heater, 9 drain gate valve and 10 drain pipe.
(V) detailed description of the preferred embodiments
The attached drawing is a concrete embodiment of the utility model. The air preheater comprises an MGGH flue gas cooler arranged in a flue at the outlet of the air preheater and a blower arranged in a cold air channel at the inlet of the air preheater, wherein a preposed flue gas cooler 3 is arranged in the flue between the outlet of the air preheater and the inlet of the MGGH flue gas cooler, a steam air heater 8 is arranged in the cold air channel at the outlet of the blower, and a water-borne air heater 5 is arranged in the cold air channel between the outlet of the steam air heater 8 and the inlet of the air preheater; the hydrophily type air heater 5 is respectively communicated with a water inlet and a water outlet of the preposed smoke cooler 3 through a water inlet main pipe 2 and a water return main pipe 4; the inlet of the steam air heater 8 is connected with a steam pipe 6, and the outlet of the steam air heater is connected with a drain pipe 10; an electric regulating valve 7 is arranged on the steam pipe 6, and a drainage gate valve 9 is arranged on a drainage pipe 10; and a water inlet main pipe 2 of the front smoke cooler 3 is provided with a circulating water pump 1.
Auxiliary steam enters the steam air heater 8 through the steam pipe 6 and the electric regulating valve 7, after heat release, the steam is drained through the drain pipe 10 and the drain gate valve 9, and the outlet air temperature of the steam air heater 8 is raised to 20 ℃ through the electric regulating valve 7.
Circulating water flows into a preposed smoke cooler 3 arranged in a flue between an outlet of an air preheater and an inlet of an MGGH smoke cooler through a water inlet main pipe 2 and a circulating water pump 1 for heat exchange, enters a water medium type air heater 5 through a water return main pipe 4 after absorbing heat for heat release, and then enters the circulating water pump 1 for circulation. The closed circulation system further increases the inlet air temperature of the air preheater to 60 ℃, and increases the comprehensive temperature of the cold end of the air preheater by 50-60 ℃.

Claims (5)

1. The utility model provides an effectively alleviate air preheater ammonium bisulfate and block up combined system, is including installing the MGGH gas cooler in air heater export flue, installs the forced draught blower in air heater entry cold air duct, its characterized in that: a preposed smoke cooler (3) is arranged in a flue between the outlet of the air preheater and the inlet of the MGGH smoke cooler, a steam air heater (8) is arranged in a cold air channel at the outlet of the air feeder, and a water medium type air heater (5) is arranged in a cold air channel between the outlet of the steam air heater (8) and the inlet of the air preheater; the water medium type air heater (5) is respectively communicated with a water inlet and a water outlet of the preposed smoke cooler (3) through a water inlet main pipe (2) and a water return main pipe (4).
2. The integrated system for effectively mitigating blockage of air preheater ammonium bisulfate as set forth in claim 1, wherein: the inlet of the steam air heater (8) is connected with a steam pipe (6), and the outlet of the steam air heater is connected with a drain pipe (10).
3. The integrated system for effectively mitigating blockage of air preheater ammonium bisulfate as set forth in claim 1, wherein: and a water circulating pump (1) is arranged on a water inlet main pipe (2) of the preposed smoke cooler (3).
4. The integrated system for effectively mitigating blockage of air preheater ammonium bisulfate as set forth in claim 2, wherein: an electric regulating valve (7) is installed on the steam pipe (6), and a drainage gate valve (9) is installed on the drainage pipe (10).
5. The integrated system for effectively mitigating blockage of air preheater ammonium bisulfate as set forth in claim 1, wherein: an MGGH flue gas cooler, an electric dust remover, an induced draft fan, an absorption tower, a flue gas reheater and a chimney are sequentially arranged in a flue at the outlet of the preposed flue gas cooler (3) along the flow direction of flue gas; and a heat medium heater and a pipeline provided with a circulating water pump are connected between the flue gas reheater and the MGGH flue gas cooler.
CN201920812581.7U 2019-05-31 2019-05-31 Combined system for effectively relieving blockage of ammonium bisulfate of air preheater Active CN210197339U (en)

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Application Number Priority Date Filing Date Title
CN201920812581.7U CN210197339U (en) 2019-05-31 2019-05-31 Combined system for effectively relieving blockage of ammonium bisulfate of air preheater

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Application Number Priority Date Filing Date Title
CN201920812581.7U CN210197339U (en) 2019-05-31 2019-05-31 Combined system for effectively relieving blockage of ammonium bisulfate of air preheater

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113713599A (en) * 2021-09-10 2021-11-30 国能神东煤炭集团有限责任公司 Circulating fluidized bed semi-dry method low-load desulfurization system and control method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113713599A (en) * 2021-09-10 2021-11-30 国能神东煤炭集团有限责任公司 Circulating fluidized bed semi-dry method low-load desulfurization system and control method
CN113713599B (en) * 2021-09-10 2023-05-12 国能神东煤炭集团有限责任公司 Semi-dry low-load desulfurization system of circulating fluidized bed and control method

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