CN106984191A - A kind of efficient hybrid system of reducing agent ammonia and its method of work for SCR denitrating flue gas - Google Patents
A kind of efficient hybrid system of reducing agent ammonia and its method of work for SCR denitrating flue gas Download PDFInfo
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- CN106984191A CN106984191A CN201710196697.8A CN201710196697A CN106984191A CN 106984191 A CN106984191 A CN 106984191A CN 201710196697 A CN201710196697 A CN 201710196697A CN 106984191 A CN106984191 A CN 106984191A
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- ammonia
- flue gas
- scr
- reducing agent
- control valve
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 361
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 179
- 239000003546 flue gas Substances 0.000 title claims abstract description 81
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 77
- 239000003638 chemical reducing agent Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 11
- 239000007921 spray Substances 0.000 claims abstract description 76
- 235000019504 cigarettes Nutrition 0.000 claims abstract description 71
- 239000007789 gas Substances 0.000 claims abstract description 71
- 238000002347 injection Methods 0.000 claims abstract description 37
- 239000007924 injection Substances 0.000 claims abstract description 37
- 238000013459 approach Methods 0.000 claims abstract description 34
- 230000007246 mechanism Effects 0.000 claims abstract description 17
- 238000012544 monitoring process Methods 0.000 claims description 17
- 239000000523 sample Substances 0.000 claims description 13
- 239000003054 catalyst Substances 0.000 claims description 12
- 230000003068 static effect Effects 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 4
- 238000005192 partition Methods 0.000 claims description 2
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 claims 1
- 238000000926 separation method Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 7
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 5
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000000149 penetrating effect Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 108700018263 Brassica oleracea SCR Proteins 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- -1 supervising device 1 Chemical compound 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
Classifications
-
- 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
- B01D53/88—Handling or mounting catalysts
-
- 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
-
- 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
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
- B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
- B01F35/718051—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings being adjustable
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2257/00—Components to be removed
- B01D2257/40—Nitrogen compounds
-
- 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
Abstract
The present invention relates to a kind of efficient hybrid system of reducing agent ammonia for SCR denitrating flue gas, including reducing agent feeding mechanism, spray ammonia flow control valve, ammonia injection apparatus, SCR denitration gas approach, independent exhaust gases passes demarcation strip, supervising device and spray ammonia flow controller, reducing agent feeding mechanism is connected with spray ammonia flow control valve, spray ammonia flow control valve is connected with ammonia injection apparatus, ammonia injection apparatus is built in SCR denitration gas approach, reducing agent feeding mechanism and spray ammonia flow control valve are arranged on outside SCR denitration gas approach, independent exhaust gases passes demarcation strip is arranged in SCR denitration gas approach, SCR denitration gas approach is divided into multiple separate cigarette districts by independent exhaust gases passes demarcation strip, ammonia injection apparatus is provided with each cigarette district, spray ammonia flow controller is connected with supervising device, each spray ammonia branch pipe flow control valve is used to individually control the ammonia flow in a cigarette district.The invention further relates to the method for work of the hybrid system.
Description
Technical field
The present invention relates to a kind of efficient hybrid system of reducing agent ammonia for SCR denitrating flue gas, the invention further relates to its work
Make method, the invention belongs to coal fired power plant SCR denitrating flue gas field, the more particularly to hybrid technology of reducing agent ammonia and flue gas.
Background technology
SCR（Selective Catalytic Reduction, SCR）Gas denitrifying technology is because of its denitration
Efficiency high, technology maturation, it has also become the one preferred technique of Large-scale fire-electricity unit denitration.Its technical principle is that reduction is sprayed into flue gas
Agent NH3, with the NO in flue gas under catalyst actionxThe harmless N of reaction generation2And H2O。
Ammonia nitrogen mol ratio distributing homogeneity is larger to SCR denitration performance impact in the flue gas of SCR catalyst in reactor top,
The height of denitration efficiency is directly affected, while also determining the height of the escaping of ammonia.If the supply of reducing agent ammonia is not enough, it will cause the area
Domain reaction of nitrogen oxides is not enough, reduces denitration efficiency；If the supply of reducing agent ammonia is excessive, it will cause the region the escaping of ammonia to increase,
Unreacted ammonia enters upstream device with flue gas from reactor outlet, causes the burn into of upstream device to block, and influences the steady of unit
Fixed operation；The ammonia into environment will also result in secondary pollution simultaneously.Ensure that ammonia nitrogen mol ratio distributing homogeneity can improve denitration effect
Rate, reduces the pre- loading amount of catalyst, extends catalyst replacement period, significant for energy saving for power plants emission reduction.
For Large-sized Coal-fired Power group SCR gas denitrifying technologies, because processing exhaust gas volumn is big, flue and SCR denitration are anti-
Answer device section larger, the control difficulty of ammonia nitrogen mol ratio distributing homogeneity is larger；Further, since China's major part SCR denitration dress
Put and belong to transformation project, site space is limited, cause the mixing distance deficiency of ammonia and flue gas, which in turns increases ammonia and flue gas
Well mixed difficulty.And in order to reach that mixing is required in Practical Project, mainly by arranging ammonia injection apparatus, static state in flue
Blender is realized.Due to the shadow of many factors such as flue gas environment is complicated and changeable, limited, the blender designing quality of mixing distance
Ring, only by ammonia injection apparatus and static mixer usually can not meet mixing require, and increased static mixer also make it is whole
The resistance of individual system further increases, and causes energy consumption to increase, and influences economic benefit.
Therefore, mixing how is developed apart from short, sprays ammonia regulation and control system simply, operational reliability is high, voltage loss is small
Hybrid technology turn into a study hotspot in recent years.
Chinese patent 201410588436.7 discloses a kind of coal steam-electric plant smoke SCR denitration system, including boiler, province's coal
Device and air preheater, the outlet connection of the economizer and boiler, the economizer is connected with air preheater, in economizer
SCR denitration system is connected with pipeline between air preheater.The technical scheme mixed is poor, it is impossible to solve above-mentioned
Problem.
The content of the invention
It is an object of the invention to overcome above shortcomings in the prior art, and a kind of reasonable in design is provided,
The mixing distance of ammonia and flue gas can significantly be shortened, the uniform journey of SCR denitration device catalyst inlet ammonia nitrogen mol ratio is effectively improved
Degree, improves denitration efficiency and reduces the efficient hybrid system of reducing agent ammonia of the SCR denitrating flue gas of amount of ammonia slip.The invention further relates to
The method of work of the efficient hybrid system of reducing agent ammonia of the SCR denitrating flue gas.All orientation of the present invention describe equal refer to the attached drawing.
The present invention the used technical scheme that solves the above problems is：A kind of reducing agent ammonia for SCR denitrating flue gas is high
Imitate hybrid system, including reducing agent feeding mechanism, spray ammonia flow control valve, ammonia injection apparatus and SCR denitration gas approach, reduction
Agent feeding mechanism, spray ammonia flow control valve and ammonia injection apparatus set gradually along ammonia flow direction, reducing agent feeding mechanism and
Spray ammonia flow control valve to be connected, spray ammonia flow control valve is connected with ammonia injection apparatus, and ammonia injection apparatus is built in SCR denitration entrance
In flue, reducing agent feeding mechanism and spray ammonia flow control valve are arranged on outside SCR denitration gas approach, it is characterised in that：Also wrap
Independent exhaust gases passes demarcation strip, supervising device and spray ammonia flow controller are included, independent exhaust gases passes demarcation strip is arranged on SCR denitration
In gas approach, SCR denitration gas approach is divided into multiple separate cigarette districts, Mei Geyan by independent exhaust gases passes demarcation strip
Ammonia injection apparatus is provided with area, spray ammonia flow control valve includes spray ammonia main pipe flow control valve along ammonia flow direction successively
With spray ammonia branch pipe flow control valve, spray ammonia main pipe flow control valve is connected with spray ammonia branch pipe flow control valve, all spray ammonia branch pipes
Flow control valve is connected with spray ammonia flow controller, and spray ammonia flow controller is connected with supervising device, each spray ammonia branch pipe stream
Control valve is used to individually control the ammonia flow in a cigarette district, when supervising device is multiple, is respectively provided with each cigarette district
There is supervising device, any one supervising device is arranged on the left side of same cigarette district ammonia injection apparatus；When supervising device is one,
Monitoring probe is additionally provided with each cigarette district, all monitoring probes are connected with supervising device, and any one monitoring probe is set
Put on the left side of same cigarette district ammonia injection apparatus.Monitoring probe is used to monitor NO in flue gasxO in concentration, flue gas2Concentration and flue gas
Flow velocity, and then calculate by NO in each cigarette district of physical separationxTotal amount, the NO reached as neededxDischarge standard is calculated by thing
The ammonia amount for needing to spray into each independent cigarette district separated is managed, the zonal control become more meticulous is realized.Numerous studies show, ammonia and cigarette
The quality of gas mixability and the draw ratio of spray ammonia section downstream flue（Mix distance and the ratio of hydraulic diameter）It is directly proportional,
Under same mixing length, the smaller mixed effect reached of hydraulic diameter is better.Relative to inside by the SCR denitration before physical separation
The draw ratio of each independent cigarette district is greatly increased after gas approach, physical separation, and the ammonia and flue gas of penetrating are mutual after separation
Mixed in independent passage aisle, can realize and be sufficiently mixed in short-range scope, the mixing distance of flue gas is greatly shortened,
Improve mixed effect simultaneously.The quantity of cigarette district is at least in two or more.When supervising device is one, all monitoring probes can
To realize the connection that monitoring is popped one's head between supervising device by installing gas circuit switching valve, realize supervising device to each by physics
The cigarette district of separation is monitored respectively in order, realizes zoning monitoring.When supervising device is multiple, each supervising device is to every
Individual cigarette district is measured simultaneously.Each ammonia injection apparatus is set in the cigarette district of physical separation, realizes that subregion sprays ammonia.
Present invention additionally comprises SCR flue gas denitration reactors, SCR flue gas denitration reactors are arranged on SCR denitration gas approach
Right side, be provided with catalyst in SCR flue gas denitration reactors.
Flow straightening grid is provided between cigarette district of the present invention and SCR flue gas denitration reactors.Flow straightening grid can conduct
First floor catalyst inlet.Independent exhaust gases passes demarcation strip can extend to flow straightening grid, independent exhaust gases passes demarcation strip it is specific
Length need to require to carry out calculating determination according to Practical Project.
Ammonia injection apparatus model vortex patern AIG of the present invention, mixed type AIG or grid type AIG.But it is not limited to
This, the preferred grid type AIG of ammonia injection apparatus.
The left side of ammonia injection apparatus of the present invention is provided with porous homogenizing plate.Porous homogenizing plate is used to further improve cigarette
Gas velocity, NOxConcentration and O2The mixed effect of measurement of concetration accuracy and lifting ammonia and flue gas.
Static mixer is provided with the right of ammonia injection apparatus of the present invention.
A kind of method of work of efficient hybrid system of reducing agent ammonia for SCR denitrating flue gas, comprises the following steps successively：
1）Reducing agent feeding mechanism sprays ammonia by spraying ammonia flow control valve, and the ammonia of ejection enters SCR denitration gas approach；
2）Step 1）The middle ammonia flowed into SCR denitration gas approach is mixed with the flue gas in SCR denitration gas approach；
It is characterized in that：Also comprise the following steps：
Supervising device monitors flue gas flow rate, NOx concentration and O in each cigarette district2Concentration, supervising device is by flue gas stream in each cigarette district
Fast data, NOx concentration data and O2Concentration data is delivered to spray ammonia flow controller, and spray ammonia flow controller is according to each cigarette district
Interior flue gas velocity data, NOx concentration data, O2Ammonia needed for concentration data and the discharge standard allowed are calculated in each cigarette district
Flow, then sprays ammonia flow controller and transmits the data on flows of required ammonia in each cigarette district to spray ammonia branch pipe flow control
Valve, then sprays the ammonia flow that the regulation of ammonia branch pipe flow control valve is flowed into each cigarette district.
The present invention sets SCR flue gas denitration reactors on the right of ammonia injection apparatus, is reacted in cigarette district and SCR denitrating flue gas
Flow straightening grid is set between device, and the ammonia and flue gas mixed in cigarette district enters SCR flue gas denitration reactors by flow straightening grid.
Short transverse of the independent exhaust gases passes demarcation strip of the present invention along SCR denitration gas approach is installed, or, it is independent
Width of the exhaust gases passes demarcation strip along SCR denitration gas approach is installed.
Independent exhaust gases passes demarcation strip length of the present invention extends to flow straightening grid.The length of separation may be selected to extend to
The flow straightening grid of SCR flue gas denitration reactor entrances, specific length need to require to carry out calculating determination according to Practical Project.
The present invention compared with the existing technology has advantages below and effect：The present invention is by thing inside SCR denitration gas approach
Reason is separated into several separate cigarette districts, by measuring flue gas flow, NOxAnd O2Concentration, and accurately controlled with reference to discharge standard
The ammonia spraying amount in each cigarette district is made, the subregion measurement become more meticulous, subregion spray ammonia control is realized；It is relatively whole by the cigarette district of physical separation
Reduced for individual SCR denitration gas approach under hydraulic diameter, identical mixing distance, mixed effect is further lifted, rectification
The uniformity of grid entrance ammonia nitrogen mol ratio gets a promotion.
Brief description of the drawings
Fig. 1 is the top plan view structural representation of the embodiment of the present invention.
In Fig. 1：1st, supervising device；2nd, gas circuit switching valve；3rd, ammonia flow controller is sprayed；4th, ammonia branch pipe flow control valve is sprayed；
5th, ammonia main pipe flow control valve is sprayed；6th, reducing agent feeding mechanism；7th, catalyst；8th, SCR flue gas denitration reactors；9th, honeycomb screen
Grid；10th, independent exhaust gases passes demarcation strip；11st, SCR denitration gas approach；12nd, ammonia injection apparatus；13rd, monitoring probe；14th, cigarette
Area；A flue gas flow directions.Orientation is overlooked relative to normal mounting installment work state.
Embodiment
Below in conjunction with the accompanying drawings and the present invention is described in further detail by embodiment, following examples are to this hair
Bright explanation and the invention is not limited in following examples.Orientation description is described according to accompanying drawing in the present embodiment.
Embodiment.
Referring to Fig. 1.
The present embodiment is a kind of efficient hybrid system of reducing agent ammonia for SCR denitrating flue gas, including supervising device 1, gas
Road switching valve 2, spray ammonia flow controller 3, spray ammonia branch pipe flow control valve 4, spray ammonia main pipe flow control valve 5, reducing agent supply
Device 6, catalyst 7, SCR flue gas denitration reactors 8, flow straightening grid 9, independent exhaust gases passes demarcation strip 10, SCR denitration entrance cigarette
Road 11, ammonia injection apparatus 12 and monitoring probe 13.
SCR denitration gas approach 11 is by the independent physical separation of exhaust gases passes demarcation strip 10 into multiple separate cigarette districts
14。
In the present embodiment, independent exhaust gases passes demarcation strip 10 has four pieces, and SCR denitration gas approach 11 is by four blocks of independent cigarettes
Gas channel partition plate 10 is divided into five separate cigarette districts 14.
Preferably, short transverse of the independent exhaust gases passes demarcation strip 10 along SCR denitration gas approach 11 in the present embodiment
Install.
Along ammonia carriage direction, reducing agent feeding mechanism 6, spray ammonia main pipe flow control valve 5, spray ammonia branch pipe flow control valve
4 and ammonia injection apparatus 12 set gradually.Reducing agent feeding mechanism 6 and spray ammonia main pipe flow control valve 5 are connected, and spray ammonia main pipe flow
The ammonia total amount sprayed in the control reducing agent of control valve 5 feeding mechanism 6.
In the present embodiment, the quantity of spray ammonia main pipe flow control valve 5 is one, and the quantity of spray ammonia branch pipe flow control valve 4 is five
It is individual.Five separate cigarette districts 14 are each provided with ammonia injection apparatus 12.Five ammonia injection apparatus 12 and five spray ammonia branch
Connected one to one between pipe flow control valve 4.Spray ammonia main pipe flow control valve 5 and five 4 points of spray ammonia branch pipe flow control valves
Not Xiang Lian, the ammonia that spray ammonia branch pipe flow control valve 4 is used to spraying from spray ammonia main pipe flow control valve 5 branch to each
Individual cigarette district 14, while adjusting the ammonia flow of ammonia injection apparatus 12 in each cigarette district 14 respectively.
Monitoring probe 13 has five, and supervising device 1 is connected with gas circuit switching valve 2, and gas circuit switching valve 2 and five monitorings are visited
First 13 are respectively connected with.Five monitoring probes 13 are separately positioned on the porch of five cigarette districts 14.In same cigarette district 14, along cigarette
Air-flow is on A directions, and monitoring probe 13 is on the left side of ammonia injection apparatus 12.Can be by wherein cigarette all the way by gas circuit switching valve 2
Sampling sample gas in area 14 is connected with supervising device 1, monitors NOxConcentration, O2Concentration and flue gas flow rate.
Supervising device 1 is connected with spray ammonia flow controller 3.
Along flue gas flow direction A directions, the right of cigarette district 14 is provided with flow straightening grid 9, wherein independent exhaust gases passes demarcation strip
10 specific length need to require to carry out calculating determination according to Practical Project.Independent exhaust gases passes demarcation strip 10 can extend to rectification
Grid 9.SCR flue gas denitration reactors 8 are arranged in the right of flow straightening grid 9, SCR flue gas denitration reactors 8 and lay catalyst
7。
The course of work of the present embodiment is as follows：Contain NO from boilerxFlue gas enter after cigarette district 14, prison each first
Probing first 13 is by the NO in each cigarette district 14 collectedxConcentration, O2Concentration and flue gas velocity data are transported to gas circuit switching valve 2；
Spray ammonia flow controller 3 is connected with supervising device 1, the NO of monitoringxConcentration, O2Concentration and the result of flue gas flow rate are transported to spray
In ammonia flow controller 3, the NO that the computer in spray ammonia flow controller 3 will be calculated in corresponding cigarette district 14xAmount, and according to need
The discharge standard to be reached calculates the NO that SCR flue gas denitration reactors 8 need to removexAmount, the NO removed as neededxAmount
The amount for obtaining needing to spray into ammonia in cigarette district 14 is calculated, and control signal is passed into spray ammonia branch pipe flow control valve 4, control is each
Branch pipe sprays into the flow of ammonia, realizes the subregion measurement become more meticulous, subregion spray ammonia control；The ammonia of penetrating is in each cigarette district 14 and cigarette
Gas is mixed, relative to inside by the SCR denitration gas approach 11 before physical separation, each independent cigarette district 14 after physical separation
Draw ratio is greatly increased, and the ammonia of penetrating and flue gas are mixed in the separate cigarette district 14 after separation, can be in short distance
In the range of realize and be sufficiently mixed, the mixing distance of flue gas is greatly shortened, while improving mixed effect；Mixed flue gas with
Ammonia enters SCR flue gas denitration reactors 8 by flow straightening grid 9, and NO is removed by catalyst 7x, and consume most NH3.Often
The calculation formula such as formula of ammonia in individual independent cigarette district 14（1）It is shown：
Q（NH3Emitted dose）=Q（Flue gas flow）*（C（NOxConcentration）-C（NOxDischarge standard））*10-9（1）
（1）In formula：Q（NH3 emitted dose）：NH in cigarette district 143Emitted dose, unit is t/h；
Q（Flue gas flow）：Flue gas flow in cigarette district 14, unit is m3/h（Standard state, butt, 6%O2）；
C（NOxConcentration）：NO in cigarette district 14xConcentration, unit is mg/m3（Standard state, butt, 6%O2）；
C（NOxDischarge standard）：NOxDischarge standard, unit mg/m3（Standard state, butt, 6%O2）.
Furthermore, it is necessary to explanation, the specific embodiment described in this specification, is named the shape of its parts and components
Title etc. can be different, and the above content described in this specification is only to structure example explanation of the present invention.It is all according to
The equivalence changes or simple change done according to the construction described in inventional idea of the present invention, feature and principle, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do various to described specific embodiment
The modification of various kinds or supplement or using similar mode substitute, without departing from the present invention structure or surmount present claims
Scope defined in book, all should belong to protection scope of the present invention.
Claims (10)
1. a kind of efficient hybrid system of reducing agent ammonia for SCR denitrating flue gas, including reducing agent feeding mechanism, spray ammonia flow control
Valve processed, ammonia injection apparatus and SCR denitration gas approach, reducing agent feeding mechanism, spray ammonia flow control valve and ammonia injection apparatus edge
Ammonia flow direction is set gradually, and reducing agent feeding mechanism is connected with spray ammonia flow control valve, spray ammonia flow control valve and ammonia spray
Injection device is connected, and ammonia injection apparatus is built in SCR denitration gas approach, reducing agent feeding mechanism and spray ammonia flow control valve peace
Outside SCR denitration gas approach, it is characterised in that：Also include independent exhaust gases passes demarcation strip, supervising device and spray ammonia flow
Controller, independent exhaust gases passes demarcation strip is arranged in SCR denitration gas approach, and SCR denitration gas approach passes through independent flue gas
Channel partition plate, which is divided into multiple separate cigarette districts, each cigarette district, is provided with ammonia injection apparatus, sprays ammonia flow control valve
Include spray ammonia main pipe flow control valve and spray ammonia branch pipe flow control valve, the flow control of spray ammonia main pipe successively along ammonia flow direction
Valve is connected with spray ammonia branch pipe flow control valve, and all spray ammonia branch pipe flow control valves are connected with spray ammonia flow controller, spray ammonia
Flow controller is connected with supervising device, and each spray ammonia branch pipe flow control valve is used to individually control the ammonia flow in a cigarette district
Amount, when supervising device is multiple, is provided with supervising device, any one supervising device is arranged on same cigarette in each cigarette district
The left side of area's ammonia injection apparatus；When supervising device is one, monitoring probe is additionally provided with each cigarette district, all monitorings are visited
Head is connected with supervising device, and any one monitoring probe is arranged on the left side of same cigarette district ammonia injection apparatus.
2. the reducing agent ammonia efficient hybrid system according to claim 1 for SCR denitrating flue gas, it is characterised in that：Also
Including SCR flue gas denitration reactors, SCR flue gas denitration reactors are arranged on the right side of SCR denitration gas approach, and SCR flue gases take off
Catalyst is provided with nitre reactor.
3. the reducing agent ammonia efficient hybrid system according to claim 2 for SCR denitrating flue gas, it is characterised in that：Institute
State and be provided with flow straightening grid between cigarette district and SCR flue gas denitration reactors.
4. the reducing agent ammonia efficient hybrid system according to claim 3 for SCR denitrating flue gas, it is characterised in that：Institute
State ammonia injection apparatus model vortex patern AIG, mixed type AIG or grid type AIG.
5. the reducing agent ammonia efficient hybrid system according to claim 4 for SCR denitrating flue gas, it is characterised in that：Institute
The left side for stating ammonia injection apparatus is provided with porous homogenizing plate.
6. the reducing agent ammonia efficient hybrid system according to claim 5 for SCR denitrating flue gas, it is characterised in that：Institute
State and be provided with static mixer on the right of ammonia injection apparatus.
7. a kind of efficient mixed stocker of reducing agent ammonia for SCR denitrating flue gas as described in claim 1-6 any claims
The method of work of system, comprises the following steps successively：
1）Reducing agent feeding mechanism sprays ammonia by spraying ammonia flow control valve, and the ammonia of ejection enters SCR denitration gas approach；
2）Step 1）The middle ammonia flowed into SCR denitration gas approach is mixed with the flue gas in SCR denitration gas approach；
It is characterized in that：Also comprise the following steps：
Supervising device monitors flue gas flow rate, NOx concentration and O in each cigarette district2Concentration, supervising device is by flue gas stream in each cigarette district
Fast data, NOx concentration data and O2Concentration data is delivered to spray ammonia flow controller, and spray ammonia flow controller is according to each cigarette district
Interior flue gas velocity data, NOx concentration data, O2The flow of ammonia needed for concentration data and discharge standard are calculated in each cigarette district,
Then to ammonia branch pipe flow control valve is sprayed, then spray ammonia flow controller transmits the data on flows of required ammonia in each cigarette district
Spray the ammonia flow that the regulation of ammonia branch pipe flow control valve is flowed into each cigarette district.
8. the method for work of the reducing agent ammonia efficient hybrid system according to claim 7 for SCR denitrating flue gas, it is special
Levy and be：SCR flue gas denitration reactors are set on the right of ammonia injection apparatus, between cigarette district and SCR flue gas denitration reactors
Flow straightening grid is set, and the ammonia and flue gas mixed in cigarette district enters SCR flue gas denitration reactors by flow straightening grid.
9. the method for work of the reducing agent ammonia efficient hybrid system according to claim 8 for SCR denitrating flue gas, it is special
Levy and be：Short transverse of the independent exhaust gases passes demarcation strip along SCR denitration gas approach is installed, or, independent flue gas leads to
Width of the road demarcation strip along SCR denitration gas approach is installed.
10. the method for work of the reducing agent ammonia efficient hybrid system according to claim 9 for SCR denitrating flue gas, its
It is characterised by：The independent exhaust gases passes demarcation strip length extends to flow straightening grid.
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| CN107389133A (en) * | 2017-08-08 | 2017-11-24 | 张晨 | Exhaust measurement, sampling apparatus and methods and applications |
| CN107998878A (en) * | 2017-12-11 | 2018-05-08 | 广州森瑟机电设备有限公司 | A kind of accurate gametic fertility equipment of large-scale flue |
| CN108392959A (en) * | 2018-02-08 | 2018-08-14 | 上海电气电站环保工程有限公司 | A kind of spray ammonia system and its implementation for denitrating flue gas |
| CN108722185A (en) * | 2018-07-27 | 2018-11-02 | 国电环境保护研究院有限公司 | A kind of spray ammonia method and spray ammonia system for charcoal base catalytic desulfurizing denitrating system |
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| CN114699889A (en) * | 2022-04-19 | 2022-07-05 | 东方电气集团东方锅炉股份有限公司 | SCR denitration system capable of accurately controlling ammonia injection amount |
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| CN107389133A (en) * | 2017-08-08 | 2017-11-24 | 张晨 | Exhaust measurement, sampling apparatus and methods and applications |
| CN107998878A (en) * | 2017-12-11 | 2018-05-08 | 广州森瑟机电设备有限公司 | A kind of accurate gametic fertility equipment of large-scale flue |
| CN108392959A (en) * | 2018-02-08 | 2018-08-14 | 上海电气电站环保工程有限公司 | A kind of spray ammonia system and its implementation for denitrating flue gas |
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| CN109513348A (en) * | 2018-12-20 | 2019-03-26 | 东方电气集团东方锅炉股份有限公司 | Combustion engine waste heat boiler SCR denitrating flue gas reducing agent spraying controlling system and control method |
| CN110064285B (en) * | 2019-04-12 | 2023-07-14 | 华电电力科学研究院有限公司 | High-temperature-resistant and intensified-mixing high-efficiency SNCR (selective non-catalytic reduction) injection device and working method thereof |
| CN110064285A (en) * | 2019-04-12 | 2019-07-30 | 华电电力科学研究院有限公司 | A kind of high temperature resistant and the efficient SNCR injection apparatus and its working method for strengthening mixing |
| CN110026085A (en) * | 2019-04-18 | 2019-07-19 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | A kind of wind ammonia independent control SCR denitration system |
| CN110568129A (en) * | 2019-09-26 | 2019-12-13 | 北京国电龙源环保工程有限公司 | SCR denitration outlet mixing and partition flue gas NOx concentration detection system and method thereof |
| CN110568129B (en) * | 2019-09-26 | 2024-03-12 | 国能龙源环保有限公司 | SCR denitration outlet mixing and zoning flue gas NOx concentration detection system and method thereof |
| WO2021161695A1 (en) * | 2020-02-13 | 2021-08-19 | 三菱パワー株式会社 | Denitration device and boiler |
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| CN111467958A (en) * | 2020-04-16 | 2020-07-31 | 华北电力科学研究院有限责任公司 | Method for determining ammonia injection flow of each branch pipe of ammonia injection grid of denitration device |
| CN112387114A (en) * | 2020-11-20 | 2021-02-23 | 西安热工研究院有限公司 | Device and method for effectively improving SCR denitration efficiency |
| CN112791568A (en) * | 2021-01-29 | 2021-05-14 | 宁波科元精化股份有限公司 | Device and method for reducing nitrogen oxides in flue gas |
| CN114699889A (en) * | 2022-04-19 | 2022-07-05 | 东方电气集团东方锅炉股份有限公司 | SCR denitration system capable of accurately controlling ammonia injection amount |
| CN115121118A (en) * | 2022-07-27 | 2022-09-30 | 西安热工研究院有限公司 | SCR denitration ammonia injection system and SCR denitration ammonia injection control method |
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Application publication date: 20170728 |