CN101586803B - Surplus heat utilization system of boiler for deeply reducing exhausted smoke temperature - Google Patents

Surplus heat utilization system of boiler for deeply reducing exhausted smoke temperature Download PDF

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Publication number
CN101586803B
CN101586803B CN2009100149053A CN200910014905A CN101586803B CN 101586803 B CN101586803 B CN 101586803B CN 2009100149053 A CN2009100149053 A CN 2009100149053A CN 200910014905 A CN200910014905 A CN 200910014905A CN 101586803 B CN101586803 B CN 101586803B
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China
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heat
boiler
low
pressure coal
heating
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CN101586803A (en
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孙奉仲
史月涛
黄新元
齐林虎
陆万鹏
王爱萍
薛鏐
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Jinan Daneng Power Technology Co Ltd
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Jinan Daneng 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
    • Y02E20/30Technologies for a more efficient combustion or heat usage

Abstract

The invention relates to a surplus heat utilization system of a boiler for deeply reducing exhausted smoke temperature, and belongs to a surplus heat recycling energy-saving system of a boiler for deeply reducing exhausted smoke temperature to below a dew point. The system uses a low-pressure coal economizer as a heat absorption main body, and the low-pressure coal economizer is arranged on a tailflue of a dust remover outlet and a desulphurization system inlet of the boiler; and a heat exchange element of the low-pressure coal economizer is made of enamel or nickel-based seepage anticorrosiv e material or anticorrosive steel to improve the anticorrosive capability of equipment after the dew point and improve the reliability. A heat absorption medium is water and is from a heat return system or a heat supply system for heat cycle of a power plant, and the heat return system and the heat supply system can be switched according to the requirement. Through the surplus heat utilization system of the boiler for deeply reducing the exhausted smoke temperature, the flue-gas temperature can be reduced to 80 to 100 DEG C; therefore, the system not only reclaims the heat, but also can meet the requirement of the desulphurization system, and creates conditions for high-efficiency work of the desulphurization system.

Description

The boiler for deeply reducing exhausted smoke temperature bootstrap system
Technical field
The invention belongs to boiler afterheat and reclaim energy conserving system, be particularly related to and a kind ofly can the degree of depth reduce all kinds of exhaust gas temperatures to dew point, utilize boiler afterheat to greatest extent, and the deeply reducing exhausted smoke temperature bootstrap system that boiler operating parameter and the method for operation are not exerted an influence.
Background technology
At present the boiler design exhaust gas temperature is greatly between 120~150 ℃, because boiler capacity, coal difference and different.And the most important factor of control exhaust gas temperature is the dew-point temperature of flue gas, depends primarily on coal-fired sulfur content and ash content.Traditional heated surface at the end of boiler wall temperature is influenced by this mostly, in order to avoid corroding and blocking up the influence of ash, all can not break through this restriction.And in fact, this exhaust gas temperature of boiler is still quite high, has bigger value.This part heat is discharged from outside the power generation cycle system and has slatterned at present, has caused a large amount of thermal loss.
Adopt the boiler of wet desulfurization system, before flue gas enters desulphurization system, require flue-gas temperature to reduce as far as possible, otherwise can not guarantee desulfuration efficiency.Generally require this temperature to be controlled between 80~100 ℃.But existing boiler smoke all surpasses this temperature requirement, have to adopt the method for flue gas water spray, has wasted great amount of water resources, has also wasted fume afterheat.The desulphurization system that employing flue gas heater (GGH) also arranged, but just at present operation conditions is seen, this system jams is serious and expend a large amount of electricity consumptions.Therefore deeply reducing exhausted smoke temperature is unable to hold oneself back to satisfy the desulfurization requirement to dew point.
Chinese patent ZL200620088594.7 discloses a kind of " low-pressure coal saver ", be a kind of equipment that utilizes residual heat from boiler fume, reduces exhaust gas temperature, but the temperature section of the exhaust gas temperature that this low-pressure coal saver reduced is generally limited on the boiler design exhaust gas temperature, exhaust gas temperature can not be reduced to below the dew point.
Summary of the invention
The objective of the invention is to overcome the deficiency of above-mentioned existing equipment technology, satisfy the requirement that present needs further reduce exhaust gas temperature, a kind of heat transmission equipment and system that can be installed in boiler tail is provided, heat energy with the recovery boiler flue gas, the degree of depth reduces the exhaust gas temperature of boiler to dew point, heat transmission equipment irreversible loss in the reduction system to greatest extent, the cycle efficieny in raising power plant.
The present invention realizes in the following manner:
The boiler for deeply reducing exhausted smoke temperature bootstrap system, the backheat or the heating system that comprise low-pressure coal saver, electric cleaner, desulphurization system and thermodynamic cycle, it is characterized in that low-pressure coal saver is as the heat exchange main body, be installed on the back-end ductwork between electric precipitation and the desulphurization system, exhaust gas temperature is reduced to below the dew point and 〉=80 ℃, heat transferring medium water commutes the heat regenerative system or the heating system of power plant thermodynamic cycle, is provided with system's transfer valve between the backheat of low-pressure coal saver and thermodynamic cycle or heating system.The boiler for deeply reducing exhausted smoke temperature bootstrap system is characterized in that the low-pressure coal saver heat exchange element adopts enamel or corrosion-resistant heat exchange element of nickel-base seeping layer or corrosion-resistant steel.
The present invention adopts low-pressure coal saver as the thermal recovery unit main body, be installed on heated surface at the end of boiler, generally be installed on after the deduster, on the flue before the desulphurization system, heat-absorbing medium is a water, it can be the condensate water that comes from heat regenerative system, also can be the backwater that comes from heating system, the perhaps water that is fit to of other temperature; Can return the most heat regenerative system of power plant thermodynamic cycle after low-pressure coal saver absorbs fume afterheat, also can be heat supplying loop, directly is hot user's heat supply; Can control introducing, the extraction location of water inlet, backwater by transfer valve, also can realize the mutual switching of heat regenerative system and heating system.So just can reduce exhaust gas temperature greatly, reclaim smoke discharging residual heat.
The present invention reduces exhaust gas temperature to dew point, reduces the irreversible loss of system equipment, boiler operatiopn is not exerted an influence and recovery waste heat.
Low-pressure coal saver of the present invention is arranged in after the deduster, can alleviate wearing and tearing.Adopt enamel or the corrosion-resistant heat exchange element of nickel-base seeping layer, perhaps adopt corrosion-resistant steel,, improve reliability to improve the resistance to corrosion below the dew point.
Because the present invention is positioned at the back-end ductwork at deduster rear portion, the waste heat of absorption is introduced in the heat regenerative system, can satisfy the requirement of desulphurization system, for the efficiency operation of desulphurization system has been created condition.
Description of drawings
Fig. 1 is a system diagram of the present invention.
Wherein 1 is cleaner, and 2 is low-pressure coal saver, and 3 is desulphurization system, and 4 is chimney, and 5 is heat regenerative system, and 6 is heating system, and 7 is system's transfer valve.
The specific embodiment
Below in conjunction with description of drawings most preferred embodiment of the present utility model:
When the present invention worked, the flue gas that flows out from deduster 1 entered low-pressure coal saver 2 and emits heat, makes the temperature of flue gas reduce.Heat-absorbing medium can be drawn from heat regenerative system 5, also can draw from heating system 6, returns heat regenerative system or heating system after low-pressure coal saver absorbs flue gas heat.Transfer valve 7 can be realized the mutual switching of heat regenerative system and heating system.Through behind the boiler for deeply reducing exhausted smoke temperature bootstrap system of the present invention, flue-gas temperature can be reduced to 80-100 ℃, and the flue gas after the cooling enters desulphurization system.

Claims (1)

1. boiler for deeply reducing exhausted smoke temperature bootstrap system, comprise low-pressure coal saver, electric cleaner, desulphurization system, and the heat regenerative system of power plant thermodynamic cycle and heating system, it is characterized in that low-pressure coal saver is as the heat exchange main body, be installed on the back-end ductwork between electric precipitation and the desulphurization system, exhaust gas temperature is reduced to below the dew point and 〉=80 ℃, heat transferring medium water commutes the heat regenerative system and the heating system of power plant thermodynamic cycle, between low-pressure coal saver and heat regenerative system and heating system, all be provided with system's transfer valve, heat transferring medium water can be drawn from heat regenerative system, also can draw from heating system, after absorbing flue gas heat, low-pressure coal saver returns heat regenerative system or heating system, can control water inlet by transfer valve, the introducing of backwater, extraction location also can be realized the mutual switching of heat regenerative system and heating system; Low-pressure coal saver adopts enamel or corrosion-resistant heat exchange element of nickel-base seeping layer or corrosion-resistant steel.
CN2009100149053A 2009-04-27 2009-04-27 Surplus heat utilization system of boiler for deeply reducing exhausted smoke temperature Active CN101586803B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN2009100149053A CN101586803B (en) 2009-04-27 2009-04-27 Surplus heat utilization system of boiler for deeply reducing exhausted smoke temperature

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Application Number Priority Date Filing Date Title
CN2009100149053A CN101586803B (en) 2009-04-27 2009-04-27 Surplus heat utilization system of boiler for deeply reducing exhausted smoke temperature

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CN101586803B true CN101586803B (en) 2011-05-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104696942A (en) * 2013-12-04 2015-06-10 铜陵市永生机电制造有限责任公司 Improved device for recovery of waste heat of gas boiler

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101922723A (en) * 2010-08-27 2010-12-22 江苏太湖锅炉股份有限公司 Dry dust remover structure
CN102607011A (en) * 2012-03-22 2012-07-25 济南达能动力技术有限责任公司 Multi-stage utilization system for transferring exhaust afterheat energy of power station boiler
CN102829463A (en) * 2012-08-20 2012-12-19 北京北交富沃机电工程科技有限公司 Extremely-low-temperature flue gas waste heat recycling system of power plant boiler
CN105546564A (en) * 2016-01-06 2016-05-04 浙江浙能节能科技有限公司 Energy-saving recycling system for low-grade heat energy in smoke pollutant treatment of thermal power plant

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1920387A (en) * 2006-09-05 2007-02-28 山东大学 Low-pressure coal saver for boiler
CN101140072A (en) * 2007-10-25 2008-03-12 上海外高桥第三发电有限责任公司 Desulfurize flue gas waste heat recovery system used in fire coal electric generating set

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1920387A (en) * 2006-09-05 2007-02-28 山东大学 Low-pressure coal saver for boiler
CN101140072A (en) * 2007-10-25 2008-03-12 上海外高桥第三发电有限责任公司 Desulfurize flue gas waste heat recovery system used in fire coal electric generating set

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
JP特开平8-21618A 1996.01.23

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104696942A (en) * 2013-12-04 2015-06-10 铜陵市永生机电制造有限责任公司 Improved device for recovery of waste heat of gas boiler

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