CN1619246A - Method of avoiding low temperature corrosion of boiler air preheater - Google Patents

Method of avoiding low temperature corrosion of boiler air preheater Download PDF

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Publication number
CN1619246A
CN1619246A CNA2004100862391A CN200410086239A CN1619246A CN 1619246 A CN1619246 A CN 1619246A CN A2004100862391 A CNA2004100862391 A CN A2004100862391A CN 200410086239 A CN200410086239 A CN 200410086239A CN 1619246 A CN1619246 A CN 1619246A
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China
Prior art keywords
air preheater
boiler
cold end
flue
end corrosion
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CNA2004100862391A
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CN100541000C (en
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蒋大龙
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Beijing Depu Xinyuan Ecological Technology Co ltd
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LONGJI POWER 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
    • 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
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process efficiency

Abstract

The present invention relates to a method for preventing air preheater from producing low-temperature corrosion. Said method includes the following measures: placing the air preheater into an air duct for providing distributed air for boiler, making the interior heating working fluid boiler feedwater of the air preheater be flowed out from the air preheater and divided into two portions, making one portion be fed into the flue gas cooler set in the flue to cool hot flue gas in flue, and another portion can be directly fed into the coal-saving device placed in the fuel, so that it can prevent the heated surface of air preheater from producing low-temperature corrosion and ash plug.

Description

A kind of method of avoiding low temperature corrosion of boiler air preheater
Technical field
The present invention relates to a kind of method of effectively utilizing the used heat in the boiler of power plant flue gas and can avoiding the air preheater generation cold end corrosion of boiler, especially be applied to utilize in the boiler of power plant of bioelectrogenesis.Wherein living beings are agricultural crop straw, wood chip, branch etc.
Background technology
Mostly the air preheater of boiler of the prior art is air preheater is arranged in the flue of boiler.CN2573978Y discloses the adjustable air supply device of a kind of heating furnace flue heat exchange, the heat exchanging segment and the air preheater of the flue of heating furnace are socket-connected, the induced duct of the outlet of air preheater connects the inlet of air-introduced machine, is blown into the burner of heating furnace through the outlet connection of air-introduced machine.Set up the accent airduct in the porch of air-introduced machine.When the exit gas temperature of air preheater is lower than the dew-point temperature of flue gas, transfer airduct suitably to open, thereby reduce the air preheater amount of air drawn, with this regulate keep exhaust gas temperature can be constant at it more than dew-point temperature.US2002069836A1 discloses a kind of device, and it is applied in the preheating device of boiler combustion gas, and preheating device is arranged in the flue, is used for the available heat transferred of stack gases is entered in the combustion air of boiler combustion gas, thereby realizes energy-conservation.
More than two pieces of prior aries all be that air preheater is arranged in the boiler flue, the inside of air preheater is as heat medium with air, when the high-temperature flue gas in the flue flows through air preheater, heat in the high-temperature flue gas is passed to the heat medium cold air of inside by the interface of air preheater, thereby the temperature of cold air is raise, hot-air after the intensification enters in the burner of boiler, thereby realizes fuel savings.Simultaneously, because the cold air in the air preheater is taken away the heat of the hot flue gas in the flue, thereby the temperature of hot flue gas also can be minimized.Thereby realize effective utilization of energy.
Summary of the invention
In the prior art air preheater is arranged in the flue, adopts flue gas and cold air heat exchange, cold end corrosion takes place in the heating surface of the fume side of air preheater easily, also clogging phenomenon can take place simultaneously.If air preheater generation cold end corrosion and stifled ash then can cause heat transfer deterioration, reduce the efficient of boiler, increase the operation and maintenance expense of boiler.And and then cause giving, the air-introduced machine energy consumption increases.
The fume side cold end corrosion takes place in electricity generation boiler Air Preheater Heating Surface easily in the prior art in order to overcome, thereby provide a kind of method of avoiding low temperature corrosion of boiler air preheater, thereby improve the service life of air preheater, improve heat transfer efficiency, reduce the use and the maintenance cost of boiler, cut down the consumption of energy, fundamentally prevent Air Preheater Heating Surface generation cold end corrosion and stifled ash.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of avoiding air preheater generation cold end corrosion is provided, air preheater 1 is arranged on the air channel 9 that is used for providing to boiler air distribution, air preheater 1 outside heated working medium is boiler wind speed adjustment, and inner heating is boiler feedwater with working medium.
The inside heating of air preheater 1 is flowed out by air preheater 1 with the working medium boiler feedwater and is entered in the gas cooler 2 that is arranged in the flue the hot flue gas in the cooling stack.
The inside heating of air preheater 1 is flowed out by air preheater 1 with the working medium boiler feedwater and is entered in the economizer 3 that is arranged in the flue.
The boiler feedwater of being flowed out by gas cooler 2 enters in the economizer 3 that is arranged in the flue.
The inside heating of air preheater 1 is flowed out by air preheater 1 with the working medium boiler feedwater and is divided into two-way by water supply control valve 5, one the tunnel enters in the gas cooler 2 that is arranged in the flue, hot flue gas in the cooling stack, the boiler feedwater of being flowed out by gas cooler 2 enters in the economizer 3 that is arranged in the flue, and another road directly enters in the economizer 3 that is arranged in the flue.
Air preheater 1 inside is extended surface tube and or the tube bank formed of light pipe.
Gas cooler 2 inside are extended surface tube and or the tube bank formed of light pipe.
The inside heating that flows into air preheater 1 comes from oxygen-eliminating device or feed-tank with the working medium boiler feedwater.Boiler is the boiler that utilizes bioelectrogenesis, and described biology is agricultural crop straw, wood chip or branch.
In the air channel of pressure fan outlet, be furnished with air preheater, the tube bank that air preheater inside is made up of extended surface tube, light pipe or the heating surface of other version, the heated working medium in heating surface outside is air; Inner heating is a hot water with working medium, and hot water comes from boiler feedwater.Air absorbs the part heat in the boiler feedwater by behind the air preheater.Hot-air after the heating is directly as the boiler combustion air distribution, promptly-and the main fuel wind and the boiler secondary air of ignition of the boiler wind, boiler bottom.
Because air preheater all is arranged in the air channel, does not adopt flue gas-air heat exchange, therefore there is not the problem of cold end corrosion and stifled ash.Be furnished with air preheater in the air channel of pressure fan outlet, air preheater adopts boiler feedwater as heat medium, after boiler feedwater enters into air preheater, part heat in the boiler feedwater is delivered to air side, heating comes from the air of environment temperature, air after being heated is directly as the boiler combustion air distribution, promptly-and the main fuel wind and the boiler secondary air of ignition of the boiler wind, boiler bottom.Because air preheater does not adopt flue gas as heat medium, thereby can fundamentally prevent air preheater generation cold end corrosion.
In order to guarantee boiler efficiency, boiler must have lower heat loss due to exhaust gas, needs exhaust gas temperature is reduced to certain limit, therefore must be furnished with enough cooling heating surfaces in flue.So in flue, except that being furnished with superheater and economizer, also be furnished with gas cooler.Suitably control water temperature and exhaust gas temperature can make the wall surface temperature of gas cooler cold junction be higher than the flue gas dew point temperature, prevent cold end corrosion.And can adopt various forms of soot blowers to remove dust stratification on the gas cooler heat-transfer areas, prevent that dust stratification is to the corrosion of wall with improve heat transfer efficiency.
The effect of water supply control valve is to regulate to enter the flow of boiler feedwater in the gas cooler, regulate the exhaust gas temperature of caloric receptivity, water temperature and the boiler of gas cooler according to different fuel and boiler load, when guaranteeing that boiler has good efficiency, the wall surface temperature that can prevent gas cooler again is lower than the flue gas dew point temperature, prevents cold end corrosion.
The beneficial effects of the utility model are that (1) fundamentally prevents Air Preheater Heating Surface generation cold end corrosion and stifled ash, avoids owing to air preheater generation cold end corrosion and block up ash causing that boiler efficiency reduces.(2) can reduce the operating cost of air preheater and maintenance, maintenance, play the effect of saving power plant's production cost.
Description of drawings:
The present invention will be further described below in conjunction with drawings and Examples.
Accompanying drawing 1 is the schematic flow diagram of the preferred embodiments of the present invention.
Among Fig. 1: 1, air preheater, 2, gas cooler, 3, economizer, 4, oxygen-eliminating device or feed-tank, 5, water supply control valve, 6, blower fan, 7, boiler feed pump, 8, boiler wind speed adjustment 9, air channel, 10, flue, 11, bypass.
The specific embodiment
Among Fig. 1, a kind of method of avoiding low temperature corrosion of boiler air preheater, in the air channel 9 of boiler-burner air feed, be furnished with air preheater 1, the tube bank that air preheater inside is made up of extended surface tube, light pipe or the heating surface of other version, heated working medium is air in the air preheater 1; Heating is a hot water with working medium, and hot water can be from oxygen-eliminating device, can also can be the available hot water that comes from other parts from the boiler feedwater case.Air in the air channel 9 absorbs the part heat in the hot water by behind the air preheater, and the hot-air after the heating is directly as boiler wind speed adjustment, by air preheater 1 cooled water, after leaving air preheater 1, enter into water supply control valve 5, be divided into two-way by water supply control valve 5 outlets.One the tunnel enters gas cooler 2, gas cooler 2 is extended surface tube, the tube bank of light pipe composition or the heating surface of other version, be arranged in the boiler flue 10, aqueous medium in the gas cooler 2 carries out heat exchange with the hot flue gas that flows through flue 10, absorb the heat in the hot flue gas, flow out gas cooler 2 then.The hot water that flows out gas cooler 2 enters in the economizer 3 that is arranged in the flue 10 again, and then is flowed out by economizer 3.Another road is then directly by bypass 11, enters into economizer 3 again after the hot aqueous medium of flowing out with gas cooler 2 converges, and then flowed out by economizer 3.Certainly the water outlet of air preheater 1 also can all enter gas cooler 2, and then enters economizer.Perhaps the water outlet of air preheater 1 all directly enters economizer gas cooler 2.
Above embodiment is the claimed method of avoiding low temperature corrosion of boiler air preheater of the present invention and system's preferred implementation thereof.Those skilled in the art can make further improvement and change on this basis, but under the prerequisite that does not break away from essence of the present invention, all falls within protection scope of the present invention.

Claims (12)

1, a kind of method of avoiding air preheater generation cold end corrosion, it is characterized in that: air preheater (1) is arranged on the air channel (9) that is used for providing air distribution to boiler, the outside heated working medium of air preheater (1) is boiler wind speed adjustment, and inner heating is boiler feedwater with working medium.
2, the method for avoiding air preheater generation cold end corrosion as claimed in claim 1, it is characterized in that: the inside heating of air preheater (1) is flowed out by air preheater (1) with the working medium boiler feedwater and is entered in the gas cooler (2) that is arranged in the flue the hot flue gas in the cooling stack.
3, the method for avoiding air preheater generation cold end corrosion as claimed in claim 1 is characterized in that: the inside heating of air preheater (1) is flowed out by air preheater (1) with the working medium boiler feedwater and is entered in the economizer (3) that is arranged in the flue.
4, the method for avoiding air preheater generation cold end corrosion as claimed in claim 2 is characterized in that: the boiler feedwater of being flowed out by gas cooler (2) enters in the economizer (3) that is arranged in the flue.
5, the method for avoiding air preheater generation cold end corrosion as claimed in claim 1, it is characterized in that: the inside heating of air preheater (1) is flowed out by air preheater (1) with the working medium boiler feedwater and is divided into two-way, one the tunnel enters in the gas cooler (2) that is arranged in the flue, hot flue gas in the cooling stack, the boiler feedwater of being flowed out by gas cooler (2) enters in the economizer (3) that is arranged in the flue, and another road directly enters in the economizer (3) that is arranged in the flue.
6,, it is characterized in that air preheater (1) is inner and be extended surface tube and or the tube bank formed of light pipe as each described method of avoiding air preheater generation cold end corrosion of claim 1-5.
7,, it is characterized in that gas cooler (2) is inner and be extended surface tube and or the tube bank formed of light pipe as claim 2,4 or 5 each described methods of avoiding air preheater generation cold end corrosion.
8, as each described method of avoiding air preheater generation cold end corrosion of claim 1-5, it is characterized in that: the inside heating that flows into air preheater (1) comes from oxygen-eliminating device or feed-tank with the working medium boiler feedwater.
9, the method for avoiding air preheater generation cold end corrosion as claimed in claim 6 is characterized in that: the inside heating that flows into air preheater (1) comes from oxygen-eliminating device or feed-tank with the working medium boiler feedwater.
10, the method for avoiding air preheater generation cold end corrosion as claimed in claim 7 is characterized in that: the inside heating that flows into air preheater (1) comes from oxygen-eliminating device or feed-tank with the working medium boiler feedwater.
11, as each described method of avoiding air preheater generation cold end corrosion among the claim 1-5, it is characterized in that: described boiler is the boiler that utilizes bioelectrogenesis.
12, the method for avoiding air preheater generation cold end corrosion as claimed in claim 11 is characterized in that: described biology is agricultural crop straw, wood chip or branch.
CNB2004100862391A 2004-10-28 2004-10-28 A kind of method of avoiding low temperature corrosion of boiler air preheater Active - Reinstated CN100541000C (en)

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CNB2004100862391A CN100541000C (en) 2004-10-28 2004-10-28 A kind of method of avoiding low temperature corrosion of boiler air preheater

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Application Number Priority Date Filing Date Title
CNB2004100862391A CN100541000C (en) 2004-10-28 2004-10-28 A kind of method of avoiding low temperature corrosion of boiler air preheater

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CN100541000C CN100541000C (en) 2009-09-16

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103380329A (en) * 2011-02-25 2013-10-30 三菱重工业株式会社 Boiler plant
CN104122193A (en) * 2014-07-25 2014-10-29 西安交通大学 Device for synchronously monitoring low-temperature corrosion process and state of flue gas cooler online
CN106439779A (en) * 2016-10-10 2017-02-22 无锡华光锅炉股份有限公司 Device for preventing low-temperature corrosion of boiler air preheater
CN106765015A (en) * 2016-12-22 2017-05-31 江联重工集团股份有限公司 One kind prevents the biomass fluid bed boiler of low-temperature corrosion of air preheater and system
CN107013900A (en) * 2017-05-22 2017-08-04 恩极而(上海)能源科技有限公司 It is a kind of with the boiler air preheating device and its pre-heating mean that condensate is medium
CN113639260A (en) * 2021-08-10 2021-11-12 中国电建集团河北省电力勘测设计研究院有限公司 Biomass boiler flue gas waste heat recovery system

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103380329A (en) * 2011-02-25 2013-10-30 三菱重工业株式会社 Boiler plant
CN103380329B (en) * 2011-02-25 2016-06-22 三菱重工业株式会社 Boiler plant
CN104122193A (en) * 2014-07-25 2014-10-29 西安交通大学 Device for synchronously monitoring low-temperature corrosion process and state of flue gas cooler online
CN106439779A (en) * 2016-10-10 2017-02-22 无锡华光锅炉股份有限公司 Device for preventing low-temperature corrosion of boiler air preheater
CN106765015A (en) * 2016-12-22 2017-05-31 江联重工集团股份有限公司 One kind prevents the biomass fluid bed boiler of low-temperature corrosion of air preheater and system
CN107013900A (en) * 2017-05-22 2017-08-04 恩极而(上海)能源科技有限公司 It is a kind of with the boiler air preheating device and its pre-heating mean that condensate is medium
CN113639260A (en) * 2021-08-10 2021-11-12 中国电建集团河北省电力勘测设计研究院有限公司 Biomass boiler flue gas waste heat recovery system
CN113639260B (en) * 2021-08-10 2023-08-15 中国电建集团河北省电力勘测设计研究院有限公司 Biomass boiler flue gas waste heat recovery system

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Denomination of invention: Method of avoiding low temperature corrosion of boiler air preheater

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