CN206868013U - A kind of efficient hybrid system of reducing agent ammonia for SCR denitrating flue gas - Google Patents
A kind of efficient hybrid system of reducing agent ammonia for SCR denitrating flue gas Download PDFInfo
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- CN206868013U CN206868013U CN201720317352.9U CN201720317352U CN206868013U CN 206868013 U CN206868013 U CN 206868013U CN 201720317352 U CN201720317352 U CN 201720317352U CN 206868013 U CN206868013 U CN 206868013U
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- ammonia
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- flue gas
- reducing agent
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Abstract
It the utility model is related 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.
Description
Technical field
It the utility model is related to a kind of efficient hybrid system of reducing agent ammonia for SCR denitrating flue gas, the utility model category
In 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, under catalyst action with the NO in flue gasxReaction generates harmless N2And 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 determines the height of the escaping of ammonia.If reducing agent ammonia supply deficiency, it will cause the area
Domain reaction of nitrogen oxides deficiency, 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, influences the steady of unit
Fixed operation；Simultaneously secondary pollution is will also result in into the ammonia of environment.Ensure that ammonia nitrogen mol ratio distributing homogeneity can improve denitration effect
Rate, the pre- loading amount of catalyst is reduced, extend catalyst replacement period, it is 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 fills
Put and belong to transformation project, site space is limited, causes the mixing of ammonia and flue gas distance deficiency, which in turns increases ammonia and flue gas
Well mixed difficulty.And required in Practical Project in order to reach mixing, 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, and spray ammonia regulation and control system is simple, and operational reliability is high, and 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 connects with air preheater, in economizer
SCR denitration system is connected with pipeline between air preheater.The technical scheme mixed is poor, can not solve above-mentioned
Problem.
Utility model content
The purpose of this utility model is to overcome above shortcomings in the prior art, and provides a kind of structure design and close
Reason, can significantly shorten the mixing distance of ammonia and flue gas, be effectively improved the uniform of SCR denitration device catalyst inlet ammonia nitrogen mol ratio
Degree, improve denitration efficiency and reduce the efficient hybrid system of reducing agent ammonia of the SCR denitrating flue gas of amount of ammonia slip.The utility model
Further relate to the method for work of the efficient hybrid system of reducing agent ammonia of the SCR denitrating flue gas.All orientation descriptions of the utility model are equal
Refer to the attached drawing.
The technical scheme in the invention for solving the above technical problem is：A kind of reducing agent for SCR denitrating flue gas
The efficient hybrid system of ammonia, including reducing agent feeding mechanism, spray ammonia flow control valve, ammonia injection apparatus and SCR denitration gas approach,
Reducing agent feeding mechanism, spray ammonia flow control valve and ammonia injection apparatus are set gradually along ammonia flow direction, reducing agent supply dress
Put and be connected with spray ammonia flow control valve, spray ammonia flow control valve is connected with ammonia injection apparatus, and ammonia injection apparatus is built in SCR denitration
In gas approach, reducing agent feeding mechanism and spray ammonia flow control valve are arranged on 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 and be arranged on SCR
In denitration gas approach, SCR denitration gas approach is divided into multiple separate cigarette districts by independent exhaust gases passes demarcation strip, often
Ammonia injection apparatus is provided with individual cigarette district, spray ammonia flow control valve includes spray ammonia main pipe flow control along ammonia flow direction successively
Valve processed and spray ammonia branch pipe flow control valve, spray ammonia main pipe flow control valve are connected with spray ammonia branch pipe flow control valve, all spray ammonia
Branch pipe flow control valve is connected with spray ammonia flow controller, and spray ammonia flow controller is connected with supervising device, each to spray ammonia branch
Pipe flow control valve is used to individually control the ammonia flow in a cigarette district, when supervising device is multiple, in each cigarette district
Supervising device is provided with, 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 when individual, in each cigarette district, all monitoring probes are connected with supervising device, and any one monitoring is visited
Head is arranged 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 rate, and then calculate by NO in each cigarette district of physical separationxTotal amount, the NO reached as neededxDischarge standard calculates
The ammonia amount for being needed to spray into each independent cigarette district of physical separation, realizes the zonal control to become more meticulous.Numerous studies show, ammonia
With the quality and the draw ratio of spray ammonia section downstream flue of flue gas mixability（Mix distance and the ratio of hydraulic diameter）Cheng Zheng
Than under same mixing length, the mixed effect that hydraulic diameter is smaller to be reached is better.Relative to inside by before physical separation
SCR denitration gas approach, the draw ratio of each independent cigarette district greatly increases after physical separation, and the ammonia of penetrating is with flue gas after separation
Separate passage aisle in mixed, can realize and be sufficiently mixed in short-range scope, the mixing of flue gas distance is big
It is big to shorten, while improve mixed effect.The quantity of cigarette district is at least in two or more.When supervising device is one, Suo Youjian
Probing head can realize the connection monitored between probe and supervising device by installing gas circuit switching valve, realize supervising device to every
The individual cigarette district by physical separation is monitored respectively in order, realizes zoning monitoring.When supervising device is multiple, each monitoring
Device measures simultaneously to each cigarette district.Each ammonia injection apparatus is set in the cigarette district of physical separation, realizes that subregion sprays ammonia.
The utility model also includes SCR flue gas denitration reactors, and SCR flue gas denitration reactors are arranged on SCR denitration entrance
The right side of flue, catalyst is provided with SCR flue gas denitration reactors.
Flow straightening grid is provided between cigarette district described in the utility model and SCR flue gas denitration reactors.Flow straightening grid can be with
As first floor catalyst inlet.Independent exhaust gases passes demarcation strip can extend to flow straightening grid, independent exhaust gases passes demarcation strip
Specific length need to carry out calculating determination according to Practical Project requirement.
Ammonia injection apparatus model vortex patern AIG, mixed type AIG or grid type AIG described in the utility model.It is but and unlimited
In this, the preferred grid type AIG of ammonia injection apparatus.
The left side of ammonia injection apparatus described in the utility model is provided with porous homogenizing plate.Porous homogenizing plate is used to further carry
High flue gas flow rate, NOxConcentration and O2Measurement of concetration accuracy and the mixed effect of lifting ammonia and flue gas.
Static mixer is provided with the right of ammonia injection apparatus described in the utility model.
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 entrance
Flue；
2）Step 1）The middle ammonia flowed into SCR denitration gas approach is mixed with the flue gas in SCR denitration gas approach
Close；
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 cigarette in each cigarette district
Gas velocity data, NOx concentration data and O2Concentration data is delivered to spray ammonia flow controller, and spray ammonia flow controller is according to each
Flue gas velocity data, NOx concentration data, O in cigarette district2Concentration data and the discharge standard allowed calculate required ammonia in each cigarette district
The flow of gas, then spray ammonia flow controller and transmit the data on flows of required ammonia in each cigarette district to spray ammonia branch pipe flow control
Valve processed, then spray the ammonia flow that the regulation of ammonia branch pipe flow control valve is flowed into each cigarette district.
The utility model sets SCR flue gas denitration reactors on the right of ammonia injection apparatus, in cigarette district and SCR denitrating flue gas
Flow straightening grid is set between reactor, and the ammonia and flue gas mixed in cigarette district is anti-into SCR denitrating flue gas by flow straightening grid
Answer device.
Short transverse installation of the independent exhaust gases passes demarcation strip described in the utility model along SCR denitration gas approach, or,
Width installation of the independent exhaust gases passes demarcation strip along SCR denitration gas approach.
Independent exhaust gases passes demarcation strip length described in the utility model extends to flow straightening grid.The length of separation may be selected to prolong
The flow straightening grid of SCR flue gas denitration reactor entrances is reached, specific length need to carry out calculating determination according to Practical Project requirement.
The utility model compared with the existing technology has advantages below and effect：The utility model is by SCR denitration entrance cigarette
Road internal physical is separated into several separate cigarette districts, by measuring flue gas flow, NOxAnd O2Concentration, and combine discharge mark
Standard accurately controls the ammonia spraying amount in each cigarette district, realizes the subregion measurement to become more meticulous, subregion spray ammonia control；By the cigarette of physical separation
Reduce hydraulic diameter for the relatively whole SCR denitration gas approach in area, under, mixed effect further carries for identical mixing
Rise, the uniformity of flow straightening 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 utility model embodiment.
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 utility model is described in further detail by embodiment, and following examples are pair
It is of the present utility model explanation and the utility model is not limited to following examples.Orientation description is according to accompanying drawing in the present embodiment
Description.
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 shares 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
Installation.
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 connect, and spray ammonia main pipe flow
Control valve 5 controls the ammonia total amount sprayed in reducing agent 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 spray ammonia branch pipe flow control valves 4 divide
Not Xiang Lian, spray ammonia branch pipe flow control valve 4 is used to by the ammonia sprayed from spray ammonia main pipe flow control valve 5 branch to each
Individual cigarette district 14, while the ammonia flow of ammonia injection apparatus 12 in each cigarette district 14 is adjusted respectively.
Monitoring probe 13 shares 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 will wherein cigarette all the way by gas circuit switching valve 2
Sampling sample gas in area 14 connects 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 carry out calculating determination according to Practical Project requirement.Independent exhaust gases passes demarcation strip 10 can extend to rectification
Grid 9.SCR flue gas denitration reactors 8 are arranged on the right of flow straightening grid 9, and catalyst is laid in SCR flue gas denitration reactors 8
7。
The course of work of the present embodiment is as follows：Contain NO from boilerxFlue gas enter cigarette district 14 after, 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 connects 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 ammonia flow controller 3 will be calculated in corresponding cigarette district 14 is sprayedxAmount, and according to need
The discharge standard to be reached calculates the NO that the needs of SCR flue gas denitration reactors 8 removexAmount, the NO removed as neededxAmount
The amount for 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 to 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 greatly shortens, while improves 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 t/h；
Q（Flue gas flow）：Flue gas flow in cigarette district 14, unit m3/h（Standard state, butt, 6%O2）；
C（NOxConcentration）：NO in cigarette district 14xConcentration, unit 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 illustrate, the specific embodiment described in this specification, the shape of its parts and components, it is named
Title etc. can be different, and the above content described in this specification is only to the utility model structure example explanation.
The equivalence changes or simple change that all construction, feature and the principle described according to the utility model patent design are done, are wrapped
Include in the protection domain of the utility model patent.The utility model person of ordinary skill in the field can be to described
Specific embodiment is made various modifications or supplement or substituted using similar mode, without departing from knot of the present utility model
Structure surmounts scope defined in the claims, all should belong to the scope of protection of the utility model.
Claims (8)
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, ammonia injection apparatus and SCR denitration gas approach processed, 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, sprays 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 are arranged in SCR denitration gas approach, and SCR denitration gas approach passes through independent flue gas
Channel partition plate is divided into multiple separate cigarette districts, and ammonia injection apparatus is provided with each cigarette district, 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 ammonia branch pipe flow control valve that sprays is used to individually control the ammonia flow in a cigarette district
Amount, when supervising device is multiple, supervising device is provided with each cigarette district, any one supervising device is arranged on same cigarette
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. the reducing agent ammonia efficient hybrid system according to claim 6 for SCR denitrating flue gas, it is characterised in that：Institute
Short transverse installation of the independent exhaust gases passes demarcation strip along SCR denitration gas approach is stated, or, independent exhaust gases passes demarcation strip edge
The width installation of SCR denitration gas approach.
8. the reducing agent ammonia efficient hybrid system according to claim 7 for SCR denitrating flue gas, it is characterised in that：Institute
State independent exhaust gases passes demarcation strip length and extend to flow straightening grid.
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| CN201720317352.9U CN206868013U (en) | 2017-03-29 | 2017-03-29 | A kind of efficient hybrid system of reducing agent ammonia for SCR denitrating flue gas |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106984191A (en) * | 2017-03-29 | 2017-07-28 | 华电电力科学研究院 | A kind of efficient hybrid system of reducing agent ammonia and its method of work for SCR denitrating flue gas |
| CN110404390A (en) * | 2019-07-12 | 2019-11-05 | 华电电力科学研究院有限公司 | A kind of SCR denitration device and its working method controlling the escaping of ammonia rate |
-
2017
- 2017-03-29 CN CN201720317352.9U patent/CN206868013U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106984191A (en) * | 2017-03-29 | 2017-07-28 | 华电电力科学研究院 | A kind of efficient hybrid system of reducing agent ammonia and its method of work for SCR denitrating flue gas |
| CN110404390A (en) * | 2019-07-12 | 2019-11-05 | 华电电力科学研究院有限公司 | A kind of SCR denitration device and its working method controlling the escaping of ammonia rate |
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