CN107008143A - A kind of Novel SCR denitrating system of anti-gypsum rain - Google Patents

A kind of Novel SCR denitrating system of anti-gypsum rain Download PDF

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Publication number
CN107008143A
CN107008143A CN201710346872.7A CN201710346872A CN107008143A CN 107008143 A CN107008143 A CN 107008143A CN 201710346872 A CN201710346872 A CN 201710346872A CN 107008143 A CN107008143 A CN 107008143A
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CN
China
Prior art keywords
heat
heat exchanger
flue gas
rotary type
absorbing end
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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.)
Pending
Application number
CN201710346872.7A
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Chinese (zh)
Inventor
凌波
凌忠钱
曾宪阳
蒋英俊
凌世杰
凌世俊
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China Jiliang University
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China Jiliang University
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Priority to CN201710346872.7A priority Critical patent/CN107008143A/en
Publication of CN107008143A publication Critical patent/CN107008143A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34Chemical or biological purification of waste gases
    • B01D53/74General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86Catalytic processes
    • B01D53/8621Removing nitrogen compounds
    • B01D53/8625Nitrogen oxides
    • B01D53/8631Processes characterised by a specific device
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/005Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by heat treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D53/00Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26Drying gases or vapours
    • B01D53/265Drying gases or vapours by refrigeration (condensation)
    • 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
    • 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
    • F23J15/08Arrangements of devices for treating smoke or fumes of heaters
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2258/00Sources of waste gases
    • B01D2258/02Other waste gases
    • B01D2258/0283Flue gases
    • 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 discloses a kind of Novel SCR denitrating system of anti-gypsum rain, rotary type heat exchanger and heat-pipe heat exchanger are set between desulfurizing tower and SCR denitration system along tail flue gas flow, air preheater exiting flue gas is flowed through successively after deduster, desulfurizing tower, cooler, rotary type heat exchanger heat absorbing end, heat-pipe heat exchanger heat absorbing end, SCR reactors and rotary type heat exchanger release end of heat and empties.Extracting high-temperature stove cigarette sends into heat-pipe heat exchanger release end of heat out of stove, and circulation is melted down again after the flue gas heat release.The low-temperature flue gas come out from desulfurizing tower is heated through rotary type heat exchanger heat absorbing end and heat-pipe heat exchanger heat absorbing end reaches catalyst converter reaction temperature window.Compared with traditional SCR denitration technology, the present invention had both avoided the influence to catalyst such as flying dust, ammonium salt, it is ensured that the activity of catalyst, can control the exhaust gas temperature of flue gas by rotary type heat exchanger release end of heat again, eliminate " gypsum rain " problem.

Description

A kind of Novel SCR denitrating system of anti-gypsum rain
Technical field
The present invention relates to flue gas denitrification system, and in particular to a kind of Novel SCR denitrating system of anti-gypsum rain, belongs to boiler Flue gas post-processing technology field.
Background technology
With the industrialized fast development of China, environmental problem turns into focus of concern.In recent years, nitrogen oxides NOxAs cause atmosphere pollution, photochemical pollution, acid rain main contributor, its administer has become people concern and research Focus.
The NO produced in current coal-burning power plant runningxIt is one of main source of nitrogen oxides.In December, 2015, state The standing meeting of business institute is determined, minimum discharge is implemented in full to coal-burning power plant before the year two thousand twenty, by NOxConcentration of emission be limited to 50mg/m3Under.
At present, ammonia process SCR denitration technology is efficiency highest, technique the most ripe denitration technology, and it is at home and abroad obtained It is widely applied.But SCR denitration technology exist in operation air preheater block, catalyst poisoning a series of problems, such as, because This adverse effect for reducing or eliminating SCR device turns into the task of top priority.
At the same time, the gypsum rain problem that desulphurization system is brought also has obtained the extensive concern of people.As gas-gas exchanges heat Device(Gas-gas Heater, abbreviation GGH)Cancellation, exhaust gas temperature is greatly reduced, and the row of entraining liquid pollutant easily occurs Put, cause in the case of normal weather, decline droplet (i.e. " gypsum rain " problem) often occurs in chimney near zone, give common people's life Living to bring very big influence, " gypsum rain " problem of solution is also extremely urgent.
The content of the invention
In order to overcome " gypsum rain " problem that background technology is present, the invention provides a kind of Novel SCR of anti-gypsum rain Denitrating system.Its technical scheme is as follows:
To solve the above problems, a kind of Novel SCR denitrating system of anti-gypsum rain of the present invention, i.e., along tail flue gas flow de- Rotary type heat exchanger and heat-pipe heat exchanger are set between sulphur tower and SCR denitration system, make the flue gas that air preheater is exported according to It is secondary flow through deduster, desulfurizing tower, cooler, rotary type heat exchanger heat absorbing end, heat-pipe heat exchanger heat absorbing end, SCR reactors and Emptying after rotary type heat exchanger release end of heat (" heat absorbing end " and " release end of heat " is defined from flue gas angle in the present invention).Taken out out of stove High-temperature flue gas is taken to melt down circulation again after sending into heat-pipe heat exchanger release end of heat, flue gas release heat.From desulfurizing tower come out it is low Warm flue gas reaches catalyst converter reaction temperature window through rotary type heat exchanger heat absorbing end and the heating of heat-pipe heat exchanger heat absorbing end.
Further, cooler is installed additional in desulfurizing tower outlet, condensate liquid is directed into desulfurizing tower by circulating pump and reused.
Further, along along flue gas stroke, the SCR reactors are arranged in after desulfurizing tower, and particular location is in revolution After formula heat exchanger heat absorbing end and heat-pipe heat exchanger heat absorbing end, before rotary type heat exchanger release end of heat.
Further, heat-pipe heat exchanger release end of heat import flue gas is quoted from boiler high temperature area, this high-temperature flue gas release heat It is discharged into again via the outlet of heat-pipe heat exchanger release end of heat to boiler high temperature area afterwards and carries out flue gas recirculation.
Further, the low-temperature flue gas of cooler outlet, first absorbs SCR reactors by means of rotary type heat exchanger heat absorbing end The heat of exiting flue gas, realizes that primary heating controls exhaust gas temperature simultaneously;Absorb high by means of heat-pipe heat exchanger heat absorbing end again The heat of warm stove cigarette, realization is heated again, so as to reach the temperature window of SCR reactors.
The present invention uses such scheme, and SCR denitration system is placed in after desulphurization system, need not introduce external heat source In the case of, by rotary type heat exchanger and heat-pipe heat exchanger by flue gas to SCR denitration reaction temperature window. Pass through the processes such as dedusting, desulfurization, therefore dust, SO due to entering the flue gas of SCR reactors2, heavy metal ion content significantly Reduction, a series of problems, such as effectively prevent air preheater blocking, the catalyst poisoning that traditional SCR denitration system is present.
The present invention is equipped with cooler after desulfurizing tower simultaneously, when flue gas enters cooler, saturation cigarette after desulfurizing tower desulfurization Water vapor condensation in gas, condensed water is squeezed into desulfurizing tower by circulating pump again and recycled again, and this measure can both disappear from source Except " gypsum rain " problem, the effect of water saving is can reach again.And exhaust gas temperature can be controlled by rotary type heat exchanger, Ke Yishi When reduction heat exchange amount, exhaust gas temperature is improved, the rising height of flue gas is improved, the shadow of " gypsum rain " to environment is technically reduced Ring.
Brief description of the drawings
Fig. 1 is a kind of Novel SCR denitrating system structural representation of anti-gypsum rain of the present invention:1- boilers;2- dedusters; 3- desulfurizing towers;4- coolers;5- rotary type heat exchanger heat absorbing ends;6- rotary type heat exchanger release end of heat;7- heat-pipe heat exchangers are inhaled Hot junction;8- heat-pipe heat exchanger release end of heat;9-SCR reactors;10- chimneys.
Fig. 2 is traditional SCR denitration system schematic diagram:11- boilers;12-SCR reactors;13- dedusters;14- desulfurizing towers; 15- chimneys.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.
Such as Fig. 1 institutes, the Novel SCR denitrating system of anti-gypsum rain of the invention, including boiler 1, deduster 2, desulfurizing tower 3, Cooler 4, rotary type heat exchanger heat absorbing end 5, heat-pipe heat exchanger heat absorbing end 7, SCR reactors 9, rotary type heat exchanger release end of heat 6th, chimney 10.The inlet flue gas of heat-pipe heat exchanger heat absorbing end 7 comes from the high-temperature region of boiler 1, and exiting flue gas is discharged into the high temperature of boiler 1 Area.
Maximum innovation of the invention is SCR denitration system being placed in after desulphurization system, by means of in desulfurization system Rotary type heat exchanger and heat-pipe heat exchanger are set between system and SCR denitration system, and realization is not introducing the condition of external heat source It is issued to the phenomenon of preventing and treating " gypsum rain ".In addition, for traditional SCR denitration technology(As shown in Figure 2)Exist air preheater block, A series of problems, such as catalyst poisoning, the present invention moves to SCR denitration system after deduster 2 and desulfurizing tower 3, and flue gas is through removing The flue gas discharged after the processes such as dirt, desulfurization is neat stress, and now dust content, sulfur content, heavy metal ion content etc. be significantly Reduction, effectively prevent catalyst poisoning problem.
The Suitable ranges of high temperature SCR process catalysts are 260-380 DEG C, to enable low-temperature flue gas to reach catalyst Reaction temperature window, through rotary type heat exchanger heat absorbing end 5 and heat-pipe heat exchanger heat absorbing end 7 after the exiting flue gas elder generation of cooler 4 Heated.The heat of rotary type heat exchanger heat absorbing end 5 is exchanged heat by the exiting flue gas of SCR reactors 9 and provided.Heat-pipe heat exchanger is inhaled The heat in hot junction 7 is provided by heat-pipe heat exchanger release end of heat 8, high temperature of the heat from boiler 1 of heat-pipe heat exchanger release end of heat 8 Flue gas.
Low-temperature flue gas from cooler 4, first passes through rotary type heat exchanger heat absorbing end 5 and is heated to 280 DEG C or so, and after pass through Overheat pipe heat exchanger heat absorbing end 7 is heated to 340 DEG C or so, reaches optimal reaction temperature.7 need of heat-pipe heat exchanger heat absorbing end There is provided less, the stability of boiler 1 will not be produced and significantly affected.
The present invention after desulfurizing tower equipped with one group of cooler 4, its it is condensable go out saturated flue gas in vapor, after processing The utilization of the interior circulation of desulfurizing tower 3 can be squeezed into by circulating pump.This measure both reduces " gypsum rain " from source, and the work of water saving is played again With.
Meanwhile, the present invention in rotary type heat exchanger release end of heat 6 thermal discharge it is controllable, when need improve flue gas exhaust gas temperature When, it is possible to decrease the thermal discharge of rotary type heat exchanger release end of heat 6, improves the rising height of flue gas, technically effectively prevent " stone The generation of cream rain ".
In summary, the invention provides a kind of new SCR denitration system, can be prevented effectively from catalyst poisoning etc. one is Row problem.Meanwhile, this SCR denitration system can control the thermal discharge of rotary type heat exchanger release end of heat 6 again, and smoke evacuation is improved to reach The purpose of temperature, effectively eliminates " gypsum rain ".
Above description and the cardinal principle for explaining the present invention, essential characteristic and its advantage, it is impossible to which the present invention is limited with this The scope of implementation.The principle and feature of the simply present invention described in description above, is not departing from spirit and scope of the invention On the premise of, the present invention also has many changes and improvement, and these are all in protection domain.

Claims (3)

1. a kind of Novel SCR denitrating system of anti-gypsum rain, including deduster(2), desulfurizing tower(3), cooler(4), its feature It is:Along flue gas flow in desulfurizing tower(3)With SCR reactors(9)Between be provided with rotary type heat exchanger heat absorbing end(5)And heat pipe-type Heat exchanger heat absorbing end(7), air preheater outlet flue gas flow through deduster successively(2), desulfurizing tower(3), cooler(4), return Rotatable heat exchanger heat absorbing end(5), heat-pipe heat exchanger heat absorbing end(7), SCR reactors(9)With rotary type heat exchanger release end of heat(6) After empty;Extracting high-temperature stove cigarette sends into heat-pipe heat exchanger release end of heat out of stove(8);From desulfurizing tower(3)Low-temperature flue gas out Through rotary type heat exchanger heat absorbing end(5)With heat-pipe heat exchanger heat absorbing end(7)Heating reaches SCR reactors(9)Temperature window.
2. a kind of Novel SCR denitrating system of anti-gypsum rain according to claim 1, it is characterised in that:In desulfurizing tower(3) Outlet install the cooler additional(4), condensate liquid is directed into desulfurizing tower by circulating pump(3)Recycling.
3. a kind of Novel SCR denitrating system of anti-gypsum rain according to claim 1, it is characterised in that:Cooler(4)Go out The low-temperature flue gas of mouth is first by means of rotary type heat exchanger heat absorbing end(5)The heat for absorbing SCR reactor outlet flue gases realizes primary Heating, while exhaust gas temperature is controlled, then by means of heat-pipe heat exchanger heat absorbing end(7)The heat for absorbing high-temperature flue gas is realized again Heating, so as to reach SCR reactors(9)Temperature window.
CN201710346872.7A 2017-05-17 2017-05-17 A kind of Novel SCR denitrating system of anti-gypsum rain Pending CN107008143A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108568210A (en) * 2018-04-11 2018-09-25 山东大学 Cooperate with the flue gas reheat eliminating white smoke technique and method of CO low-temperature denitrations
CN111617610A (en) * 2020-06-16 2020-09-04 潘帅 Energy-saving environment-friendly low-noise desulfurization, denitrification and dust removal device and treatment method
US20210220772A1 (en) * 2019-10-29 2021-07-22 Huaneng Clean Energy Research Institute Flue gas low-temperature adsorption denitrification method

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108568210A (en) * 2018-04-11 2018-09-25 山东大学 Cooperate with the flue gas reheat eliminating white smoke technique and method of CO low-temperature denitrations
CN108568210B (en) * 2018-04-11 2021-02-09 山东大学 Smoke reheating white smoke eliminating process and method for cooperating with CO low-temperature denitration
US20210220772A1 (en) * 2019-10-29 2021-07-22 Huaneng Clean Energy Research Institute Flue gas low-temperature adsorption denitrification method
US11925898B2 (en) * 2019-10-29 2024-03-12 Huaneng Clean Energy Research Institute Flue gas low-temperature adsorption denitrification method
CN111617610A (en) * 2020-06-16 2020-09-04 潘帅 Energy-saving environment-friendly low-noise desulfurization, denitrification and dust removal device and treatment method

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Inventor after: Ling Zhongqian

Inventor after: Ling Bo

Inventor after: Zeng Xianyang

Inventor after: Jiang Yingjun

Inventor after: Ling Shijie

Inventor after: Ling Shijun

Inventor before: Ling Bo

Inventor before: Ling Zhongqian

Inventor before: Zeng Xianyang

Inventor before: Jiang Yingjun

Inventor before: Ling Shijie

Inventor before: Ling Shijun

RJ01 Rejection of invention patent application after publication
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Application publication date: 20170804