CN107036120A - A kind of thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system - Google Patents

A kind of thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system Download PDF

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Publication number
CN107036120A
CN107036120A CN201710410894.5A CN201710410894A CN107036120A CN 107036120 A CN107036120 A CN 107036120A CN 201710410894 A CN201710410894 A CN 201710410894A CN 107036120 A CN107036120 A CN 107036120A
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CN
China
Prior art keywords
flue gas
chimney
gas
power plant
boiler
Prior art date
Application number
CN201710410894.5A
Other languages
Chinese (zh)
Inventor
陈凯
延禹
贾晓威
Original Assignee
西安富凯能源科技有限责任公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 西安富凯能源科技有限责任公司 filed Critical 西安富凯能源科技有限责任公司
Priority to CN201710410894.5A priority Critical patent/CN107036120A/en
Publication of CN107036120A publication Critical patent/CN107036120A/en

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/06Arrangements of devices for treating smoke or fumes of coolers
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/006Layout of treatment plant
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/022Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow
    • F23J15/025Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material for removing solid particulate material from the gasflow using filters
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00Arrangements of devices for treating smoke or fumes
    • F23J15/02Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
    • F23J15/04Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material using washing fluids
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/20Sulfur; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2215/00Preventing emissions
    • F23J2215/30Halogen; Compounds thereof
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00Intercepting solids
    • F23J2217/10Intercepting solids by filters
    • F23J2217/102Intercepting solids by filters electrostatic
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23JREMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2217/00Intercepting solids
    • F23J2217/50Intercepting solids by cleaning fluids (washers or scrubbers)
    • 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 system that the present invention proposes a kind of new thermal power plant's afterbody chimney anticorrosion and pollutant deep removal, more particularly to a kind of thinking for reducing acid dew point and corroding in advance.Proposition system of the present invention includes heat exchanger, flue gas blender, flue gas heater, chimney, blower fan at different levels after boiler body, boiler tail SCR device, heat-exchanger rig at different levels, deduster, desulfurizing tower, desulfurizing tower.Before flue gas after desulfurization enters chimney, make the reduction of its dew point, and vapor and acidic corrosive gas are further condensed into discharge, the corrosion of chimney is transferred in more tractable heat exchanger.It is easily handled by that will corrode to be transferred in the heat exchanger with protection, reduces the cost of chimney maintenance and transformation;And desulfurization blower fan is transferred to desulfurizing tower rear portion, due to the reduction of cigarette temperature, so as to reduce power plant's operation power consumption, improve the economic benefit of power plant.

Description

A kind of thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system
Technical field
The present invention relates to the system of a kind of new thermal power plant's afterbody chimney anticorrosion and pollutant deep removal, more particularly to A kind of thinking for reducing acid dew point and corroding in advance, belongs to the corrosion-resistant field and ultra-clean discharge neck of Rear of Utility Boiler equipment Domain.
Background technology
Flue gas after burning can be delivered in the air of certain altitude and discharge by chimney, increase the range of scatter of flue gas, subtract Few pollution of the flue gas to power plant surrounding area, is indispensable part in thermal power plant.
Contain a certain amount of oxysulfide in coal fired power plant flue gas, pass through wet desulphurization(FGD)Afterwards, although SO2Content It is greatly decreased, but SO3Removal efficiency but can only achieve 20% ~ 30%.After desulfurizing tower, the humidity increase of flue gas, temperature Degree declines, and makes the SO in flue gas3Condense to form acid condensate liquid in flue and chimney surface with vapor.In addition, after desulfurization Also containing the strong corrosive material such as hydrogen fluoride and chloride in flue gas, these factors cause jointly corrosion strength in chimney it is high, Permeability is strong and low temperature and high relative humidity diluted acid type corrosion phenomenon of more difficult strick precaution.
It is general to use inorganic material anti-corrosion and organic material anti-corrosion two ways for current chimney anticorrosion measure.But It is that China's generating set smoke evacuation operating mode is more complicated, on the one hand smoke evacuation uses the mixing heat smoke method of operation, and by-pass damper is opened Number of times is more;On the other hand because many factors cause partly or wholly construction quality problem, and lack for anti-corrosion material The effective test evaluation method or guide specifications of system.These all cause the corrosion phenomenon of chimney to remain unchanged to be widely present and non- Chang Yanchong, makes economy of power plant benefit not high and chimney anti-corrosion, transformation and maintenance difficulty, expense are too high.Therefore a kind of fire is designed The afterbody system of chimney of electric plant anti-corrosion and pollutant deep removal, is just particularly important.
The content of the invention
Thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system proposed by the present invention, including boiler body, boiler Heat exchanger after afterbody SCR device, heat-exchanger rig at different levels, deduster, desulfurizing tower, desulfurizing tower, flue gas blender, flue gas heater, Chimney, blower fan at different levels.Before flue gas after desulfurization enters chimney, make the reduction of its dew point, and by vapor and acidic corrosive gas Body further condenses discharge, and the corrosion of chimney is transferred in more tractable heat exchanger.
Wherein described boiler tail flue gas heat-exchanger rig includes:Heated surface at the end of boiler(2), air preheaters at different levels (4), economizer(5), flue gas condenser after desulfurizing tower(9), flue gas heater before chimney(12).
The blower fan at different levels includes the air-introduced machine being connected with house outlet(7)And the booster fan set before chimney (13).
In thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system of the present invention, reduction flue gas acid dew point Method includes two kinds:First, reduce below flue-gas temperature to acid dew point, sour gas is condensed discharge in advance;Second, reduce cigarette Vapor and acid gas partial pressure in gas.
The method of two kinds described in it reduction flue gas acid dew points, can be used simultaneously in two ways, can also only use the A kind of method.
The method of described reduction flue-gas temperature is that flue gas condenser is set after desulfurizing tower.
The heat-exchange working medium of the flue gas condenser set after the desulfurizing tower can be gas, or liquid;Its form Can for dividing wall type, heat accumulating type, fluidly connect indirect type and gas is gas mixed etc..
The material of the flue gas condenser set after the desulfurizing tower is corrosion-resistant metal materials, or easily changes cheap material, Or the new material such as fluoroplastics and ceramics, or take the material of sprayed protection.
The method of the reduction vapor and acid gas partial pressure is that flue gas blender is set after flue gas condenser, is made Cool and condense the flue gas of removing acid contaminant and the gas mixing dried, increase flue gas volume, reduce vapor and acidity Partial pressure.
The flue gas blender that the flue gas condenser rear is set, dry flue gas therein can be flue gas cooling after desulfurizing tower The gas working medium of device, or other dry gas.
The supercharger set before the chimney, can substitute original booster fan in flue gas system.Due to sour gas Condensation discharge in advance, it is therefore prevented that the corrosion of blower fan;Gas temperature is reduced, and reduces blower fan power consumption, and economy of power plant is improved.
Thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system of the present invention, when boiler tail sets wet type The ultra-clean exhaust apparatus such as electric precipitation, low temperature electric precipitation, or pollutant removing it is up to standard when, the setting of chimney can be cancelled, make cigarette Gas is directly discharged after deep condensation.
Thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system of the present invention, it is anti-available for old chimney of electric plant The depth of rotten and pollutant removing is transformed, it can also be used to the design-build of new power plant.
Thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system of the present invention, the system is fired available for power station Coal burning boiler, it can also be used to Industrial Boiler, civil boiler, and biomass boiler.
What it is it is an object of the invention to provide a kind of new thermal power plant's afterbody chimney anticorrosion and pollutant deep removal is System, it can effectively reduce the humidity and oxysulfide of flue gas, hydrogen fluoride, the concentration of chloride in chimney, flue gas is reached ring Protect the standard of discharge and the corrosion of chimney is greatly reduced.In addition, being transferred to the heat exchanger being easily handled with protection by that will corrode In, reduce the cost that chimney is safeguarded and transformed;And desulfurization blower fan is transferred to desulfurizing tower rear portion, due to the reduction of cigarette temperature, from And power plant's operation power consumption is reduced, improve the economic benefit of power plant.
Brief description of the drawings
The following drawings is only intended to, in making schematic illustration and explanation to the present invention, not delimit the scope of the invention.Its In:
Fig. 1 is new thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system schematic of the invention;
Fig. 2 illustrates for a kind of embodiment of new thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system of the invention Figure.
Wherein, in Fig. 1 and Fig. 2:
1. boiler furnace;2. back-end surfaces;3. SCR;4. air preheater;5. economizer;6. deduster;7. air inducing Machine;8. desulfurizing tower;9. flue gas condenser;10. flue gas blender;11. chimney;12. temperature rise heat exchanger;13. it is pressurized wind Machine;14. flue gas cool-down heat exchanger.
Embodiment
Fig. 1 is the new thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system schematic of the present invention, and Fig. 2 is this Invent new thermal power plant's afterbody chimney anticorrosion and a kind of embodiment schematic diagram of pollutant deep removal system.
A kind of application of thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system proposed by the present invention is such as Fig. 2 institutes Show, including heat exchanger, cigarette after boiler body, boiler tail SCR device, heat-exchanger rig at different levels, deduster, desulfurizing tower, desulfurizing tower Gas blender, flue gas heater, chimney, blower fan at different levels.Before flue gas after desulfurization enters chimney, make the reduction of its dew point, and will Vapor and acidic corrosive gas further condense discharge, and the corrosion of chimney is transferred in more tractable heat exchanger.
In system of the present invention, boiler tail flue gas heat-exchanger rig is as shown in Figure 2:Heated surface at the end of boiler(2), it is at different levels Air preheater(4), economizer(5), the anterior flue gas cool-down heat exchanger of deduster(14), flue gas condenser after desulfurizing tower(9)、 Flue gas heater before chimney(12).
The blower fan at different levels includes the air-introduced machine being connected with house outlet(7), connect the air-introduced machine booster fan, with And the booster fan set before chimney(13).
For thermal power plant's afterbody chimney anticorrosion of the present invention and pollutant deep removal system, its core concept is: Tail flue gas after desulfurization enters before chimney, reduces its dew-point temperature, vapor and sour gas is condensed discharge in advance, keep away Exempt from condensation of the flue gas in chimney, so as to prevent the corrosion phenomenon of chimney.Dew-point temperature is reduced in terms of two to carry out:First, Flue-gas temperature is reduced after desulfurizing tower, a part of vapor therein and sour gas is condensed discharge in advance.Thus reduce The content of vapor and sour gas in flue gas, so as to reduce vapor and acid gas partial pressure.Secondly, enter in flue gas Before chimney, reduce steam partial pressure and acid gas partial pressure again by making it be mixed with dry air, further reduction dew point temperature Degree.Furthermore, it is possible to increase GGH heat exchangers before chimney, the temperature of flue gas after lifting mixing, it is to avoid corrosion reaction in chimney Occur.
As shown in Fig. 2 setting flue gas condenser after desulfurizing tower(9), this flue gas condenser is gas-gas heat exchanger, bosher Matter is the air of air drying.This flue gas condenser uses fluoroplastics material, and periodic flushing surface.Pass through this flue gas in flue gas During condenser, flue-gas temperature is reduced, the H not being removed in flue gas2SO4, HCl, HF and NOxDeng sour gas in heat exchanger surface Condensation discharge.And the dry air of condensation working medium is served as, it is passed directly into the flue gas blender after condenser.
Flue gas blender after condenser(10)For further reducing the vapor and sour gas that are not removed in flue gas Body partial pressure, flue gas dew point temperature is reduced with this.The dry air of condensation working medium is served as within the condenser, and cigarette is passed through after heating In gas blender, it is mutually mixed with being passed through flue gas therein.Flue gas volume increases and temperature is raised, make vapor in flue gas and Volume fraction shared by sour gas reduces, flue gas dew point reduction.
Mixed flue gas, the temperature rise heat exchanger after being arranged in blender(10)Heating, temperature is further raised, cigarette The hot pressing of gas and rising height are improved, and are able to smoothly discharge from chimney.And the hot side working medium in this temperature rise heat exchanger, come from The flue gas cool-down heat exchanger arranged before deduster.In heat exchanger of this working medium before deduster, flue-gas temperature is reduced to 90 DEG C Left and right, while working medium endothermic temperature is raised, and will release in cooling heat exchanger of this partial heat after blender, to be lifted Flue-gas temperature in heat exchanger.
In this application of system of the present invention, as shown in Fig. 2 the booster fan of boiler tail is moved into chimney Before.Flue gas drying now, flue gas dew point reduction, corrosion will not be caused to booster fan, blower fan anti-corrosion cost is reduced;Simultaneously Flue gas flow is relatively small, reduces blower fan power consumption.Flue gas is made after blower fan, overcoming the devices such as desulfurizing tower, condenser Into resistance, enable flue gas smooth discharge.
Above-mentioned case study on implementation is only a kind of embodiment of system of the present invention, when boiler tail sets wet type electricity to remove The ultra-clean exhaust apparatus such as dirt, low temperature electric precipitation, or pollutant removing it is up to standard when, the setting of chimney can be cancelled, flue gas is passed through Cross after deep condensation and directly discharge.When condenser condensation effect preferably, while when acid contaminant is less in flue gas, Ke Yiqu The setting of smoke elimination gas blender.When most vapor in anterior flue gas and sour gas condensation discharge within the condenser When, the setting of flue gas heater can be cancelled.Old power plant, can be directly between desulfurizing tower and chimney when chimney anticorrosion is transformed Condenser and flue gas blender are set, improvement cost can be saved while preferable antiseptic effect is reached.It is of the present invention Thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system, in addition to coal burning boiler of power station, are equally applicable to Industrial Boiler, the people With boiler, and biomass boiler.

Claims (10)

1. a kind of thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system, including boiler body, boiler tail SCR dress Put, it is heat exchanger after heat-exchanger rig at different levels, deduster, desulfurizing tower, desulfurizing tower, flue gas blender, flue gas heater, chimney, at different levels Blower fan, it is characterised in that:Before flue gas after desulfurization enters chimney, make the reduction of its dew point, and by vapor and acidic corrosive Gas further condenses discharge, and the corrosion of chimney is transferred in more tractable heat exchanger.
2. a kind of thermal power plant's afterbody chimney anticorrosion according to claim 1 and pollutant deep removal system, its feature exist In boiler tail flue gas heat-exchanger rig includes:Flue gas condensing after back-end surfaces, air preheater at different levels, economizer, desulfurizing tower The booster fan set before device, chimney before flue gas heater, the air-introduced machine being connected with house outlet, chimney.
3. a kind of thermal power plant's afterbody chimney anticorrosion according to claim 1 and pollutant deep removal system, its feature exist In the method for reduction flue gas dew point includes:First, reduce below flue-gas temperature to acid dew point, make the sour gas row of condensation in advance Go out;Second, reduce vapor and acid gas partial pressure in flue gas;Two methods can be used simultaneously, can also only use the first Method.
4. the method for reduction flue-gas temperature according to claim 3, it is characterised in that flue gas condensing is set after desulfurizing tower Device.
5. flue gas condenser according to claim 4, it is characterised in that the heat-exchange working medium of the flue gas condenser can be Gas, or liquid;Its form can for dividing wall type, heat accumulating type, fluidly connect indirect type and gas is gas mixed etc.; Cooler material is corrosion-resistant metal materials, or easily changes the new materials such as cheap material, or fluoroplastics and ceramics, or is taken The material of sprayed protection.
6. the method for reduction vapor according to claim 3 and acid gas partial pressure, it is characterised in that in flue gas condensing Flue gas blender is set after device, makes cooling and condenses the flue gas of removing acid contaminant and the gas mixing dried, increase flue gas Volume, reduces vapor and acid gas partial pressure.
7. flue gas blender according to claim 6, it is characterised in that dry flue gas therein is cold for flue gas after desulfurizing tower The gas working medium of cold end in condenser, or other dry gas.
8. the booster fan set before chimney according to claim 2, it is characterised in that flue gas system Central Plains can be substituted Some booster fans, because sour gas condenses discharge in advance, it is therefore prevented that the corrosion of blower fan;Gas temperature is reduced, and reduces wind Electromechanics consumption, economy of power plant is improved.
9. thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system according to claim 1-8, it is characterised in that When the ultra-clean exhaust apparatus such as boiler tail setting wet-esp, low temperature electric precipitation, or pollutant removing are up to standard, Ke Yiqu The setting of smoke elimination chimney, makes flue gas directly be discharged after deep condensation.
10. thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system according to claim 1-9, its feature exist In available for old chimney of electric plant anti-corrosion and the transformation of the depth of pollutant removing, it can also be used to the design-build of new power plant;It can be used for Coal burning boiler of power station, it can also be used to Industrial Boiler, civil boiler, and biomass boiler.
CN201710410894.5A 2017-06-04 2017-06-04 A kind of thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system CN107036120A (en)

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CN201710410894.5A CN107036120A (en) 2017-06-04 2017-06-04 A kind of thermal power plant's afterbody chimney anticorrosion and pollutant deep removal system

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04504976A (en) * 1989-02-15 1992-09-03
CN102121703A (en) * 2010-12-28 2011-07-13 哈尔滨工业大学 Mixed type flue gas reheating system suitable for wet type flue gas purification process of high-cold region
CN105805768A (en) * 2016-05-19 2016-07-27 洛阳瑞昌石油化工设备有限公司 Energy saving and environmental protecting equipment and process for reducing white smoke in flue gas
CN105937773A (en) * 2016-06-02 2016-09-14 山东泓奥电力科技有限公司 Power station boiler condensing flue gas dehumidification and purification energy-saving system
CN106512637A (en) * 2016-12-06 2017-03-22 四川省简阳空冷器制造有限公司 Device and method for removing white smoke

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04504976A (en) * 1989-02-15 1992-09-03
CN102121703A (en) * 2010-12-28 2011-07-13 哈尔滨工业大学 Mixed type flue gas reheating system suitable for wet type flue gas purification process of high-cold region
CN105805768A (en) * 2016-05-19 2016-07-27 洛阳瑞昌石油化工设备有限公司 Energy saving and environmental protecting equipment and process for reducing white smoke in flue gas
CN105937773A (en) * 2016-06-02 2016-09-14 山东泓奥电力科技有限公司 Power station boiler condensing flue gas dehumidification and purification energy-saving system
CN106512637A (en) * 2016-12-06 2017-03-22 四川省简阳空冷器制造有限公司 Device and method for removing white smoke

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