CN106110873A - Combine before and after removing SCR denitration device SO in flue gas3and the device of flue dust - Google Patents

Combine before and after removing SCR denitration device SO in flue gas3and the device of flue dust Download PDF

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Publication number
CN106110873A
CN106110873A CN201610713003.9A CN201610713003A CN106110873A CN 106110873 A CN106110873 A CN 106110873A CN 201610713003 A CN201610713003 A CN 201610713003A CN 106110873 A CN106110873 A CN 106110873A
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CN
China
Prior art keywords
flue
scr denitration
cyclone dust
flue gas
dust
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Pending
Application number
CN201610713003.9A
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Chinese (zh)
Inventor
刘沛奇
何胜
李乾坤
郑文广
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Huadian Electric Power Research Institute Co Ltd
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Huadian Electric Power Research Institute Co Ltd
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Priority to CN201610713003.9A priority Critical patent/CN106110873A/en
Publication of CN106110873A publication Critical patent/CN106110873A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/81—Solid phase processes
    • B01D53/83—Solid phase processes with moving reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
    • B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/8621—Removing nitrogen compounds
    • B01D53/8625—Nitrogen oxides
    • B01D53/8631—Processes characterised by a specific device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation 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
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B01D53/90—Injecting reactants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Treating Waste Gases (AREA)

Abstract

The present invention relates to one and combine before and after removing SCR denitration device SO in flue gas3And the device of flue dust, economizer and ash bucket thereof, absorbent storage, first order absorption agent spraying system, absorbent induction system, some cyclone dust extractors, ammonia-spraying grid, SCR denitration reactor, two grades of sorbent injection systems, described economizer and ash bucket thereof, first order absorption agent spraying system, some cyclone dust extractors, SCR denitration reactor, two grades of sorbent injection systems pass sequentially through flue and are attached, equipped with trona as absorbent in described absorbent storage, sorbent injection system is arranged in economizer hopper exhanst gas outlet and SCR denitration reactor exit, cyclone dust extractor is arranged on the flue of SCR denitration reactor inlet.Needed for the present invention, general consumption raw material is rich in mineral resources, cheap, and cyclone dust extractor technology maturation, equipment are reliable, changes less to unit existing equipment, it is not necessary to special messenger operates, and equipment and operation expense are low.

Description

Combine before and after removing SCR denitration device SO in flue gas3And the device of flue dust
Technical field
The present invention relates to one and combine before and after removing SCR denitration device SO in flue gas3And the device of flue dust, belong to environmental protection and set Standby field.
Background technology
On February 29th, 2016, State Statistics Bureau issues " national economy and social development statistical communique in 2015 ".Publication number According to display, 2015, whole nation raw coal output completed 37.5 hundred million tons, and export of coal amount completes 5,330,000 tons, and export amount of money is 3,100,000,000 Unit；Coal import volume completes 204,060,000 tons.And over nearly 6 years, coal production maintains more than 3,400,000,000 tons all the time, coal is as me The supply pattern of state's main energy sources will not change within following some time.But producing during coal burning substantial amounts of has Pest matter, particularly in thermal power generation industry, containing substantial amounts of SO in the flue gas after coal burning3And flue dust.
SO3Main harm substantially have following some: 1 and denitrification reducing agent generate ammonium hydrogen sulfate cause catalysqt deactivation, compel Make the unit out of stock device of running on the lower load SCR out of service；2, in ammonium hydrogen sulfate absorption flue gas, dust blocks and corrosion air is pre- Hot device heat exchange element；3, low-temperature zone forms H2SO4Corrosion relevant device；4, smoke evacuation " Lan Yu " phenomenon, increase smoke evacuation opacity Deng.
High cloud of dust gas is when flowing through SCR denitration reactor, and soot dust granule can produce abrasion, appropriateness abrasion to denitrating catalyst Be conducive to the renewal of catalyst surface active layer；Excessive wear can make the too fast loss of catalyst surface active component, reduces and urges The life-span of agent；Heavy wear can make catalyst local thinning, causes the fracture of catalyst, even blocks catalyst channels or damage Evil catalyst upstream device.
In sum, the SO in flue gas3And flue dust be restriction unit and environmental protection equipment economy, Effec-tive Function important because of Element, especially puts into operation on SCR denitration device full load and the impact in service life of denitrating catalyst is huge, causes environmental protection pressure to increase Greatly, operating cost increases.
Research work proposed SO in numerous removing flue gas3Or the method for flue dust, remove SO before traditional denitration3Method There are disadvantages that and not enough, its key constraints has:
(1) SO is not taked before SCR denitration device3Control technology, causes unit middle-low load working condition SCR denitration device to be moved back Go out to run.
(2) alkaline absorbent, the SO reacted the most completely are sprayed before SCR denitration device3Absorbent may reduce catalyst Chemism even make catalysqt deactivation.
(3) SO in flue gas is removed before SCR denitration device3Technology, is limited in that and cannot remove because of SCR denitration oxygen The SO changed and produce3Cause obstruction and the corrosion of air preheater, increase and run and maintenance cost.
(4) catalyst is caused abrasion during flowing through catalyst by the flue gas of high dustiness, and the equipment that affects normally is transported Row, increase operating cost.
(5) using trona lysate as the method for absorbent, limited by conditions such as scene and absorbing liquid concentration, absorbing liquid Supply pipe easily blocks, and system complex.
Summary of the invention
For problem above, the present invention provides one to combine before and after removing SCR denitration device SO in flue gas3And the dress of flue dust Put, including economizer and ash bucket, absorbent storage, first order absorption agent spraying system, absorbent induction system, cyclone dust removal Device gas approach, some cyclone dust extractors, cyclone entrance flue, ammonia-spraying grid, SCR denitration reactor, two grades of absorptions Agent spraying system, described economizer and ash bucket, first order absorption agent spraying system, some cyclone dust extractors, SCR denitration reaction Device, two grades of sorbent injection systems pass sequentially through flue and are attached, equipped with trona as suction in described absorbent storage Receiving agent, described sorbent injection system is arranged in economizer hopper exhanst gas outlet and SCR denitration reactor exit, described whirlwind Cleaner unit is arranged in sorbent injection system and on the flue of SCR denitration reactor inlet, it is simple to absorb in removing flue gas Agent and part flue dust.Utilize trona resource rich in mineral resources as SO3Absorbent, can avoid unreacted SO3Absorbent is led Cause denitrating catalyst poisoning and deactivation, it is to avoid SO3React, with denitrification reducing agent, the ammonium hydrogen sulfate generated, cause denitrating catalyst to lose Live；Avoid because of SO3And the ammonium hydrogen sulfate generated denitrification apparatus forced outage when causing performing low-load running of machine set；Avoid big particle diameter cigarette The dirt excessive wear to denitrating catalyst；Avoid the SO produced because of SCR denitration oxidation3Cause the stifled of air preheater Plug and corrosion, it is ensured that the equipment economy such as denitrating catalyst and air preheater, Effec-tive Function.In addition, the present invention also have with Lower feature: one is mainly to have carried out the transformation of flue on the basis of existing equipment, it is ensured that SO3Enough reactions are had with absorbent Time, enhance SO3Assimilation effect, simultaneously can also reduce improvement cost；Two is that ammonia-spraying grid is arranged in cyclone dust extractor Exhaust pass position, it is possible to ensure that amino reductive is sufficiently mixed with flue gas, it is to avoid cause ground floor because of flue changes of section The phenomenon that in catalyst inlet flue gas, reductant concentration deviation is bigger occurs；Three is that two-stage injection absorbent can fully remove combustion Burn and the SO of catalyst oxidation generation3, it is to avoid on denitrification apparatus and the impact of air preheater.At economizer hopper flue gas Absorbent is sprayed in flue by exit applied compression air, and the trona as absorbent produces with coal combustion process in flue gas SO3Reaction, generates stable solid product with flue gas downstream.As the physics of trona of absorbent in the present invention Characteristic, on the premise of ensureing chemism, is determined by flying dust characteristic, should ensure that it is bigger with particle diameter in flue gas in concrete operations Flue dust together captured by cyclone dust extractor.Described absorbent bin is arranged in sorbent injection system with layer or close height Degree, so can reduce transmission range, it is to avoid line clogging in transmitting procedure.
Preferably can also arrange deflector at the inlet flue duct of cyclone dust extractor and/or at exhaust pass. By arranging deflector, the flue gas flow field that can make entrance cyclone dust extractor and air preheater is uniform.
Preferably can also arrange deflector at the inlet flue duct of cyclone dust extractor and/or at exhaust pass. By arranging deflector, the flue gas flow field that can make entrance cyclone dust extractor and air preheater is uniform.
At the gas approach of cyclone dust extractor, preferably there also is provided wind speed controllable register door, in order to ensure that whirlwind removes Dirt device inlet flue gas flow field meets the design requirement that equipment full load puts into operation.
Preferably, wear strip is set in described sorbent injection system.In practical operation, regulate sorbent injection system System makes it spray with flue gas downstream, is provided with the wear strip having flow-disturbing effect concurrently in windward side, and flue gas is formed after wear strip Turbulent flow beneficially flue gas is sufficiently mixed with absorbent, can improve SO further3Absorption efficiency.
Further, cyclone dust extractor quantity is 2 to 4, according to unit size and field condition, a SCR denitration reaction Device exhaust pass arranges 2-4 cyclone dust extractor, it is ensured that by SO3Absorbent and major part flue dust removing, and make resistance increase Add in the reasonable scope.
Further, SO in flue gas before and after this combines removing SCR denitration device3And the device of flue dust could be included for by The storehouse pump in the flue dust of removing grey storehouse in being delivered to factory and pneumatic ash conveying pipe, described storehouse pump and pneumatic ash conveying pipe are connected to rotation On wind cleaner unit, it is possible to ash storehouse in the high temperature ash to cyclone dust extractor removing is delivered to factory after carrying out cooling process in time, it is simple to It is uniformly processed.
The present invention compared with prior art, has the following advantages and effect: before present systemization removing SCR denitration device SO in rear flue gas3And major part flue dust, required general consumption raw material is rich in mineral resources, cheap, and cyclone dust extractor technology becomes Ripe, equipment is reliable, changes less to unit existing equipment, it is not necessary to special messenger operates, and possesses the condition that domesticizes completely, equipment and operation Maintenance cost is low.
The present invention realizes, economizer and the exit of ash bucket thereof by simply transforming denitrification apparatus gas approach Flue gas and SO3Absorbent is sufficiently mixed, the SO in removing flue gas3, then enter the flue dust in cyclone dust collector removing flue gas And SO3Absorbent granules, it is achieved combine before and after removing SCR denitration device SO in flue gas3And flue dust, it is to avoid unreacted SO3Absorb Agent causes denitrating catalyst poisoning and deactivation, it is to avoid SO3React, with denitrification reducing agent, the ammonium hydrogen sulfate generated, cause denitrating catalyst Inactivation；Avoid because of SO3And the ammonium hydrogen sulfate generated denitrification apparatus forced outage when causing performing low-load running of machine set；Avoid because of SCR The SO that denitrating catalyst aoxidizes and produces3Cause blocking and the corrosion of air preheater, it is to avoid the flue dust mistake to denitrating catalyst Degree weares and teares thus ensures the equipment economy such as denitrating catalyst and air preheater, Effec-tive Function.
Accompanying drawing explanation
In order to be illustrated more clearly that the present invention, in describing embodiment below, the required accompanying drawing used is situated between simply Continue.It should be evident that the accompanying drawing in describing below is only the description of embodiments of the invention, for ordinary skill people From the point of view of Yuan, on the premise of not paying creative work, it is also possible to carry out simple deformation according to technical scheme or title becomes Change, or take customary means, it is also possible to realize goal of the invention.
Fig. 1 is to combine before and after removing SCR denitration device SO in flue gas in the embodiment of the present invention3And the structure of the device of flue dust Schematic diagram.
Label declaration: 1-economizer and ash bucket thereof, 2-absorbent storage, 3-first order absorption agent spraying system, 4-absorbs Agent induction system, 5-cyclone dust extractor gas approach, 6-cyclone dust extractor, 7-storehouse pump and pneumatic ash conveying pipe, 8-cyclone dust removal Device exhaust pass, 9-ammonia-spraying grid, 10-Benitration reactor, bis-grades of sorbent injection systems of 11-.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, following example be explanation of the invention and The invention is not limited in following example.
As it is shown in figure 1, SO in flue gas before and after combining removing SCR denitration device in the present embodiment3And the device of flue dust includes Economizer and ash bucket 1, absorbent storage 2, first order absorption agent spraying system 3, absorbent induction system 4, cyclone dust extractor Gas approach 5, cyclone dust extractor 6, storehouse pump and pneumatic ash conveying pipe 7, cyclone entrance flue 8, ammonia-spraying grid 9, denitration 10, two grades of sorbent injection systems 11 of reactor.
Arrange sorbent injection system 3 in economizer hopper flue gas 1 exit position, spray into SO3Absorbent trona, absorbs Agent spraying system windward side wear strip has spoiler function concurrently and ensures that absorbent can be sufficiently mixed with flue gas, periodically to injection system In system, each jet pipe carries out impulse blowing.
According to SO in flue gas3Concentration and trona in the parameter determination such as operating condition of the content of effective ingredient and boiler Absorbent supply, wherein absorbent effective ingredient and SO in flue gas3The ratio of molar concentration be about 3:1, it is ensured that by flue gas Most SO3Removing.
SO in flue gas3Entering cyclone dust extractor with absorbent after fully reacting, the flue dust of cyclone dust extractor removing passes through the end The storehouse pump in portion and air-transport system cooling, and it is transported to ash storehouse in factory.
Cyclone dust extractor inlet flue duct arranges deflector and baffle door, and the flue gas flow field controlling to enter cyclone dust extractor meets Design requirement, it is achieved the full load of equipment puts into operation；Cyclone entrance flue arranges deflector.Removing SO3And major part cigarette The flue gas of dirt enters SCR denitration reactor.
Under the catalytic action of SCR denitration, part SO in flue gas2It is oxidized to SO3, this part SO3With flue gas stream The absorbent hybrid reaction provided with two grades of sorbent injection systems after going out SCR denitration reactor, by newly-generated SO3Removing, Avoid because of SO3Cause obstruction and the corrosion of air preheater.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of its parts, be named title Etc. can be different.All equivalences done according to structure, feature and the principle described in inventional idea of the present invention or simple change, all include In the protection domain of patent of the present invention.Those skilled in the art can be to described specific embodiment Make various amendment or supplement or use similar mode to substitute, without departing from the structure of the present invention or surmount this power Scope defined in profit claim, all should belong to protection scope of the present invention.

Claims (7)

1. combine before and after removing SCR denitration device SO in flue gas for one kind3And the device of flue dust, including economizer and ash bucket, absorption Agent storage, first order absorption agent spraying system, absorbent induction system, cyclone dust extractor gas approach, some cyclone dust extractors, Cyclone entrance flue, ammonia-spraying grid, SCR denitration reactor, described economizer and ash bucket thereof, first order absorption agent injection system System, some cyclone dust extractors, Benitration reactor, pass sequentially through flue and be attached, equipped with absorption in described absorbent storage Agent, described sorbent injection system is arranged in economizer hopper exhanst gas outlet and SCR denitration reactor exit, and described whirlwind removes Dirt device is arranged in sorbent injection system and on the flue of SCR denitration reactor inlet, and described absorbent bin is arranged In sorbent injection system with layer or close height, described ammonia-spraying grid is arranged on cyclone entrance flue, its feature It is: also include that two grades of sorbent injection systems, described two grades of sorbent injection systems are installed near SCR denitration reactor In exhaust pass.
Combine before and after removing SCR denitration device SO in flue gas the most as claimed in claim 13And the device of flue dust, its feature exists In: on the flue of described cyclone dust extractor import and/or outlet, it is disposed with deflector.
Combine before and after removing SCR denitration device SO in flue gas the most as claimed in claim 1 or 23And the device of flue dust, its feature It is: at the gas approach of described cyclone dust extractor, also arrange wind speed controllable register door.
Combine before and after removing SCR denitration device SO in flue gas the most as claimed in claim 33And the device of flue dust, its feature exists In: described sorbent injection system is provided with wear strip.
Combine before and after removing SCR denitration device SO in flue gas the most as claimed in claim 33And the device of flue dust, its feature exists In: described cyclone dust extractor quantity is 2 to 4.
Combine before and after removing SCR denitration device SO in flue gas the most as claimed in claim 33And the device of flue dust, its feature exists In: also include storehouse pump and pneumatic ash conveying pipe, described storehouse pump and the pneumatic transporting in ash storehouse in the flue dust of removing is delivered to factory Ash pipeline is connected to cyclone dust extractor bottom.
Combine before and after removing SCR denitration device SO in flue gas the most as claimed in claim 33And the device of flue dust, its feature exists In: described absorbent effective ingredient and SO in flue gas3The ratio of molar concentration be about 3:1.
CN201610713003.9A 2016-08-23 2016-08-23 Combine before and after removing SCR denitration device SO in flue gas3and the device of flue dust Pending CN106110873A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106706836A (en) * 2017-01-18 2017-05-24 华电电力科学研究院 Online detection device and detection method of catalyst activity of SCR (selective catalytic reduction) denitrification system
CN110813026A (en) * 2019-11-01 2020-02-21 华电电力科学研究院有限公司 Flue gas SO with base injection and multi-stage humidification3Removal method
CN113941234A (en) * 2021-12-20 2022-01-18 湖南安普诺环保科技有限公司 Sulfur trioxide desorption system in flue gas

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11165030A (en) * 1997-12-05 1999-06-22 Mitsubishi Heavy Ind Ltd Method for recovering sulfuric acid and sulfur trioxide in waste gas
CN104474897A (en) * 2014-12-02 2015-04-01 中国大唐集团科学技术研究院有限公司 Method for removing sulfur trioxide from coal-fired flue gas
CN105148696A (en) * 2015-08-11 2015-12-16 南京中电环保科技有限公司 Denitration and dust removal system and method for industrial kiln gas
CN105444148A (en) * 2015-12-15 2016-03-30 北京中电恒博科技有限公司 Graded air preheating boiler
CN206008457U (en) * 2016-08-23 2017-03-15 华电电力科学研究院 Before and after a kind of joint removing SCR denitration device in flue gas SO3 and flue dust device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11165030A (en) * 1997-12-05 1999-06-22 Mitsubishi Heavy Ind Ltd Method for recovering sulfuric acid and sulfur trioxide in waste gas
CN104474897A (en) * 2014-12-02 2015-04-01 中国大唐集团科学技术研究院有限公司 Method for removing sulfur trioxide from coal-fired flue gas
CN105148696A (en) * 2015-08-11 2015-12-16 南京中电环保科技有限公司 Denitration and dust removal system and method for industrial kiln gas
CN105444148A (en) * 2015-12-15 2016-03-30 北京中电恒博科技有限公司 Graded air preheating boiler
CN206008457U (en) * 2016-08-23 2017-03-15 华电电力科学研究院 Before and after a kind of joint removing SCR denitration device in flue gas SO3 and flue dust device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106706836A (en) * 2017-01-18 2017-05-24 华电电力科学研究院 Online detection device and detection method of catalyst activity of SCR (selective catalytic reduction) denitrification system
CN110813026A (en) * 2019-11-01 2020-02-21 华电电力科学研究院有限公司 Flue gas SO with base injection and multi-stage humidification3Removal method
CN113941234A (en) * 2021-12-20 2022-01-18 湖南安普诺环保科技有限公司 Sulfur trioxide desorption system in flue gas
CN113941234B (en) * 2021-12-20 2022-03-15 湖南安普诺环保科技有限公司 Sulfur trioxide desorption system in flue gas

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