CN207462967U - A kind of flue gas high concentrate NOx realizes the device of minimum discharge - Google Patents
A kind of flue gas high concentrate NOx realizes the device of minimum discharge Download PDFInfo
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- CN207462967U CN207462967U CN201721417055.8U CN201721417055U CN207462967U CN 207462967 U CN207462967 U CN 207462967U CN 201721417055 U CN201721417055 U CN 201721417055U CN 207462967 U CN207462967 U CN 207462967U
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Abstract
The utility model discloses the devices that a kind of flue gas high concentrate NOx realizes minimum discharge, belong to denitrating flue gas field, including SNCR liquid denitrification reducing agent injection apparatus and SNCR gaseous state denitrification reducing agent injection apparatus, SNCR liquid denitrification reducing agents injection apparatus is set on the flame reduction atmosphere zones included between burner and burnout degree apart from boiler combustion exhausted wind 2m 4m, and boiler furnace furnace arch, furnace nose lower area or furnace outlet horizontal flue front wall, SNCR gaseous state denitrification reducing agents injection apparatus is the porous pipe network or void channels on the vertical section of flue in horizontal flue region.The utility model can make flue gas high concentrate NOx (500mg/Nm3More than, particularly 1000mg/Nm3More than) realize minimum discharge, NOx concentration is less than 50mg/Nm3, denitration efficiency reaches more than 95%.
Description
Technical field
The utility model belongs to denitrating flue gas field.
Background technology
The boiler of the fuel such as part burning anthracite, meager coal, the NOx concentration of boiler raw emissions is higher, generally up to
500mg/Nm3More than, some is even as high as 1000mg/Nm3More than, it is taken off using single selective catalytic reducing agent (SCR) flue gas
Nitre technology uses single selective non-catalytic reduction agent (SNCR) gas denitrifying technology, it is impossible to meet current thermal power plant's cigarette
The ultra-low emission of NOx 50mg/Nm that gas pollutant is implemented3Limit value requirement.
In order to meet the ultra-low emission of NOx 50mg/Nm of coal steam-electric plant smoke pollutant implementation3Limit value, some SNCR-SCR
Combined denitration technology is applied to recirculating fluidized bed (CFB) boiler, but mainly solves the problems, such as CFB boiler full load denitration, and
And denitrification reducing agent is using single reducing agent.Chinese patent literature ZL201210228616.5 proposes a kind of CFB boiler
SNCR+SCR mixing denitrating systems, spray into SNCR denitration reducing agent at CFB boiler cyclone separator, and SNCR denitration unreacted is complete
SCR denitration of the remaining reducing agent as arranged downstream between economizer reducing agent, which takes full advantage of CFB boiler
The separation of cyclone separator, mixed characteristic, the SNCR denitration reducing agent that can be sparged into are uniformly mixed with flue gas, are had higher
SNCR denitration efficiency, but the coal-powder boiler that cannot solve no separator has higher SNCR denitration efficiency.
Existing well known coal-powder boiler SNCR+SCR combined denitration technologies, typically in boiler furnace furnace arch, furnace nose lower part, stove
Thorax export level flue spray into SNCR denitration reducing agent, the complete remaining reactant of SNCR unreacteds as downstream SCR denitration also
Former agent, since SNCR reducing agents are that feeding boiler furnace furnace arch, furnace nose lower part and burner hearth go out after liquid reducing agent is atomized by spray gun
Mouth horizontal flue, is limited by atomizing particle size kinetic energy, and the SNCR reducing agents of penetrating can only reach boiler furnace furnace arch, furnace nose lower part week
Border region and furnace outlet horizontal flue inner peripheral wall region, it is impossible to be deep into central area, SNCR denitration reducing agent cannot be complete
All standing flue section, it is poor with the mixing uniformity of flue gas, it can not be thoroughly mixed with flue gas, it is straight additionally as liquid reducer
It connects and sprays into boiler suitable temperature region, for heating surface intensive around, there is the risk of heated surface corrosion and booster, sternly
The use of spray gun is constrained again, while a large amount of liquid sprays into, and will also influence boiler efficiency.It integrates so that coal-powder boiler
SNCR denitration is less efficient, normally only the denitration efficiency of 30-40%, and the synthesis denitration efficiency of SNCR+SCR is less than 85%, it is impossible to
It solves high concentrate NOx and realizes 50mg/Nm3Minimum discharge limit value problem.
Utility model content
The purpose of this utility model is that：The SNCR+SCR collaboration method of denitration and dress of a kind of double medium reducing agents are provided
It puts, makes flue gas high concentrate NOx (500mg/Nm3More than, particularly 1000mg/Nm3More than) realize minimum discharge, NOx concentration is less than
50mg/Nm3, denitration efficiency reaches more than 95%.
The purpose of this utility model is realized by following technical proposals：
A kind of flue gas high concentrate NOx realizes the device of minimum discharge, including boiler furnace, equipped with SCR denitration
Back-end ductwork and the horizontal flue for being directly connected to boiler furnace outlet and back-end ductwork, SCR denitration are additionally provided with before
SCR gaseous state denitrification reducing agent injection apparatus further includes SNCR liquid denitrification reducing agent injection apparatus and SNCR gaseous states denitration reduction
Agent injection apparatus, SNCR liquid denitrification reducing agents injection apparatus are set on the flame reduction included between boiler-burner and burnout degree
Property atmosphere zones and boiler furnace furnace arch, furnace nose lower area and/or furnace outlet horizontal flue front wall, the denitration of SNCR gaseous states is also
Former agent injection apparatus is the porous pipe network or void channels on the vertical section of flue in horizontal flue region.
Alternatively, it is fired set on the SNCR liquid denitrification reducing agent injection apparatus of flame reduction atmosphere zones apart from boiler
Wind 2m-4m to the greatest extent.
Alternatively, compression is not used set on the SNCR liquid denitrification reducing agent injection apparatus of flame reduction atmosphere zones
Air atomizing.
Alternatively, the pipe network of SNCR gaseous states denitrification reducing agent injection apparatus or pipeline tapping direction and flue gas flow direction one
It causes, open pore size 3-10mm.
Alternatively, SCR gaseous states denitrification reducing agent injection dress is arranged in the flue between boiler economizer and air preheater
It puts and SCR denitration.
Alternatively, the SNCR liquid set on boiler furnace arch, furnace nose lower furnace region or furnace outlet horizontal flue front wall takes off
The injection average grain diameter of nitre reducing agent injection apparatus is 100-150 microns, and particle diameter distribution is at 0-400 microns.
The aforementioned main scheme of the utility model and its each further selection scheme can be freely combined to form multiple schemes,
The scheme that can be used and be claimed for the utility model；And the utility model, (each non conflicting selection) selection between and
It can also be freely combined between other selections.Those skilled in the art are after the utility model is understood according to the prior art
It can understand there are many combining with common knowledge, be the claimed technical solution of the utility model, do not do exhaustion herein.
The workflow of the utility model：
Existing denitration technology is mainly SNCR and SCR denitration technology.Wherein SNCR denitration technology：Reducing agent ammonia and flue gas
In NOx occur at a high temperature of 850-1100 DEG C selective non-catalytic reduction (SNCR) reaction, NOx is reduced to nitrogen, it is right
The boiler temperature region answered is the furnace arch, furnace nose lower area of Pulverized Fuel Boiler Furnace and horizontal flue region.SCR denitration technology：Reducing agent
Ammonia and the NOx in flue gas 260-450 DEG C low temperature, selective catalytic reduction (SCR) occurs under catalyst action react, general
NOx is reduced to nitrogen, and corresponding boiler temperature region is the economizer exit of boiler tail.
The applicant's experimental study is found, under the high temperature, reducing atmosphere at 1300-1600 DEG C, reducing agent ammonia and flue gas
In NOx can also occur selective non-catalytic reduction (SNCR) reaction, NOx is reduced to nitrogen.Corresponding boiler area is only
Region between boiler-burner and burnout degree, this 1300-1600 DEG C of region flame temperature, the CO gases that coal combustion generates make
It is in reducing atmosphere to obtain this region.
50mg/Nm is realized especially for high concentrate NOx3Minimum discharge, only routine SNCR+SCR denitration technologies can not
Realize minimum discharge, according to the research of the applicant, it is also necessary to using between burner and burnout degree high temperature, reducing atmosphere
Implement SNCR denitration in region.
In the utility model, the complete remaining reactant conduct of SNCR denitration unreacted is arranged in boiler back end ductwork SCR and takes off
The reducing agent of nitre by optimizing SNCR denitration reducing agent injection technique, taking double medium reducing agents, improves SNCR denitration reducing agent
With the mixing uniformity of flue gas, while SNCR denitration efficiency is improved, reach the SNCR denitration efficiency of conventional pulverized-coal stove
More than 60%, while create conditions for downstream SCR denitration reducing agent with uniformly mixing for flue gas, reach cooperation-removal flue gas NOx
Purpose finally makes the denitration efficiency of SNCR+SCR cooperation-removals reach more than 95%.
(1) liquid denitrification reducing agent is sprayed by spray gun in the reducing atmosphere region of boiler combustion flame, conveniently
Be between the burner and burnout degree apart from boiler combustion exhausted wind 2m-4m flame reduction atmosphere zones arrangement SNCR liquid take off
Nitre reducing agent injection apparatus, SNCR liquid denitrification reducing agent injection apparatus do not use compressed air to be atomized, and SNCR denitration efficiency reaches
To more than 30%.
(2) it is restored in boiler furnace furnace arch, furnace nose lower area or furnace outlet horizontal flue front wall by the denitration of SNCR liquid
Agent injection apparatus sprays into liquid denitrification reducing agent, it is preferable that furnace outlet horizontal flue front wall sets SNCR liquid denitrification reducing agents
The average grain diameter of injection apparatus injection is controlled at 100-150 microns, and at 0-400 microns, SNCR denitration efficiency reaches particle diameter distribution
More than 20%.
(3) by being uniformly covered with porous pipe network or antipriming pipe on the vertical section of flue in furnace outlet horizontal flue region
The SNCR gaseous state denitrification reducing agents injection apparatus injection gaseous state denitrification reducing agent in road, the gaseous state denitrification reducing agent of injection are completely dispersed
With covering flue section, gaseous state denitrification reducing agent can be mixed thoroughly with flue gas, and SNCR denitration efficiency reaches more than 40%.
By above-mentioned (1), (2), (3), SNCR denitration efficiency reaches more than 60%.
(1), the complete reactant of (2), (3) SNCR denitration unreacted enters downstream in company with flue gas, is further continued for as SNCR/
The reducing agent of SCR denitration.
Since SNCR denitration reducing agent is by uniform cloth on the vertical section of flue in furnace outlet horizontal flue region
Full porous pipe network or void channels injection gaseous state denitrification reducing agent, gaseous state denitrification reducing agent are completely dispersed and cover flue and break
Face, while also realize what the complete reactant of SNCR denitration unreacted was mixed as downstream SCR denitration reducing agent with flue gas in advance
Uniformity is uniformly mixed the condition of creating with flue gas for downstream SCR denitration reducing agent, achievees the purpose that cooperation-removal NOx.
(4) pass through SCR gaseous state denitrification reducing agent injection apparatus in the gas approach of boiler tail SCR denitration.Example
As ammonia injection grid (AIG) injects gaseous reducing agent and utilizes the complete reactant of upstream SNCR denitration unreacted, SCR denitration
Reach more than 90% denitration efficiency.
Final SNCR+SCR collaborations denitration efficiency reaches more than 95%.
(5) liquid denitrification reducing agent generates the molten of gaseous ammonia for urea liquid or ammonia spirit or high-temperature heating resolution
Liquid.Gaseous state denitrification reducing agent is gas ammonia or gas ammonia mixed gas.
The beneficial effects of the utility model：Make flue gas high concentrate NOx (500mg/Nm3More than, particularly 1000mg/Nm3With
On) realize minimum discharge, NOx concentration is less than 50mg/Nm3, denitration efficiency reaches more than 95%.
Description of the drawings
Fig. 1 is the device flow diagram of the utility model embodiment；
In figure, 10 be burner hearth, and 11 be boiler-burner, and 12 be fire air nozzle, and 13 be boiler furnace furnace arch, furnace nose, and 14 be stove
Thorax export level flue front wall, 15 be furnace outlet horizontal flue region, and 16 be boiler economizer, and 17 be SCR denitration,
18 be air preheater, and 19 be back-end ductwork, and 31 be the first spray gun, and 32 be the second spray gun, and 33 be third spray gun, 41 for trepanning pipe network or
Pipeline, 42 be ammonia-spraying grid, and 30 be liquid denitrification reducing agent, and 40 be gaseous state denitrification reducing agent.
Specific embodiment
The utility model is further described with reference to specific embodiments and the drawings.
Refering to what is shown in Fig. 1, boiler furnace 10 and back-end ductwork 19 equipped with SCR denitration 17 are straight by horizontal flue 15
It connects in succession, is not provided with cyclone separator.Preferably, SCR gaseous state denitrification reducing agents injection apparatus is ammonia-spraying grid (AIG),
SNCR liquid denitrification reducing agents injection apparatus is spray gun, and SNCR gaseous state denitrification reducing agent injection apparatus is out the pipe network of several apertures
Or pipeline.Specific arrangement is as follows：
Is set on the hearth wall of flame reduction atmosphere zones between boiler-burner 11 and fire air nozzle 12
One spray gun 31, suitably the flame reduction atmosphere between the burner and burnout degree apart from boiler combustion exhausted wind 2m-4m
Spray gun is arranged in region, and spray gun does not use compressed air to be atomized.
In 13 lower part of boiler furnace furnace arch, furnace nose, the second spray gun 32 is set.
Third spray gun 33 is set on furnace outlet horizontal flue front wall 14.
The trepanning pipe network or pipe of uniform several apertures of cloth full gate on the vertical section of flue of furnace outlet horizontal flue 15
Road 41, pipe network or pipeline tapping direction are consistent with flue gas flow direction, open pore size 3-10mm.
SCR denitration 17 is arranged in flue between boiler economizer 16 and air preheater 18.It also can be by economizer
16 exhaust pass pull out arrangement SCR denitration.17 number of plies of SCR denitration is 1-3 layers (they being 2 layers in exemplary plot),
Setting ammonia-spraying grid (AIG) 42 in 17 gas approach of SCR denitration.
Urea liquid or ammonia spirit can be passed through by the liquid denitrification reducing agent 30 for other solution for being thermally decomposed into gas ammonia
Pipeline arrives separately at first, second and third spray gun 31,32,33, and the liquid denitrification reducing agent that spray gun sprays into occurs with the NOx in flue gas
SNCR denitration is reacted.The complete denitration reaction agent of unreacted enters downstream with flue gas, continues as SNCR/SCR denitrification reducing agents.
The gaseous state denitrification reducing agent 40 of gas ammonia or gas ammonia mixed gas is sent to pipe network or pipeline 41 by pipeline, passes through pipe
Aperture on net or pipeline 41 is injected into inside furnace outlet horizontal flue, and SNCR denitration, which occurs, with the NOx in flue gas reacts.Not
The denitration reaction agent reacted enters downstream with flue gas, continues as SCR denitration reducing agent.
The gaseous state denitrification reducing agent 40 of gas ammonia or gas ammonia mixed gas is sent into ammonia-spraying grid (AIG) 42 by pipeline, passes through
Ammonia-spraying grid (AIG) 42 is injected into flue gas, is flowed into together with the reactant complete with upstream SNCR denitration reaction unreacted with flue gas
SCR denitration 17 under the action of SCR denitration 17, occurs SCR denitration with the NOx in flue gas and reacts.
Example as aforementioned utility model scheme：
Burn anthracitic 125MW pulverized-coal fired boilers, and the NOx background values for the high concentration that boiler combustion generates is 1000mg/
Nm3。
The flue gas that boiler combustion generates and first spray gun 31 in burner flame reducing atmosphere region spray into 20-50%'s
Urea liquid occurs SNCR denitration and reacts, and the NOx concentration in flue gas is reduced to 700mg/Nm3, SNCR denitration efficiency 30%.
Flue gas continues towards cocurrent flake hearth-tapping below furnace arch, furnace nose, the 20- sprayed into the second spray gun 32 or third spray gun 33
50% urea liquid occurs SNCR denitration and reacts, and the NOx concentration in flue gas is reduced to 560mg/Nm3, SNCR denitration efficiency
20%.When boiler load is less than 50%, the second spray gun 32 puts into operation, and put into operation third spray gun 33 when load is higher than 50%.
Flue gas flows through boiler export horizontal flue 15, with SNCR occurs from 5% gaseous ammonia of pipe network or the injection of pipeline 41
Denitration reaction, the NOx concentration in flue gas are reduced to 336mg/Nm3, SNCR denitration efficiency 40%, comprehensive SNCR denitration efficiency
66.4%.
The complete reactant of SNCR denitration unreacted flows into downstream with flue gas, 5% injected with ammonia-spraying grid (AIG) 42
Gaseous ammonia mixing after flow into SCR denitration 17, occur SCR denitration reaction, flow out SCR denitration 17 after flue gas
In NOx concentration be reduced to 33.6mg/Nm3, SCR denitration efficiency 90%.The denitration efficiency of SNCR+SCR cooperation-removals is
96.64%.
Comparative example 1：
This comparative example is consistent with the example of previous embodiment, difference lies in：The first spray gun 31 is not provided with, integrates SNCR
Denitration efficiency 44%, SCR denitration efficiency 90%, the denitration efficiency of SNCR+SCR cooperation-removals is 94.4%, NOx emission concentration
56mg/Nm3, it is impossible to meet less than 50mg/Nm3Minimum discharge it is horizontal.
Comparative example 2：
This comparative example is consistent with the example of previous embodiment, difference lies in：In the flue of furnace outlet horizontal flue 15
The reducing agent injection apparatus arranged on vertical section does not spray gaseous state denitrification reducing agent, but sprays liquid denitrification reducing agent.Its
Comprehensive SNCR denitration efficiency 49.6%, SCR denitration efficiency 90%, the denitration efficiency of SNCR+SCR cooperation-removals is 94.96%,
NOx emission concentration 50.4mg/Nm3, it is impossible to meet less than 50mg/Nm3Minimum discharge it is horizontal.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement made within the spirit and principle of utility model etc., should be included in the utility model
Protection domain within.
Claims (5)
1. a kind of flue gas high concentrate NOx realizes the device of minimum discharge, including boiler furnace, the tail equipped with SCR denitration
Portion's flue and the horizontal flue for being directly connected to boiler furnace outlet and back-end ductwork, SCR denitration are additionally provided with before
SCR gaseous state denitrification reducing agent injection apparatus, it is characterised in that：Further include SNCR liquid denitrification reducing agent injection apparatus and SNCR gas
State denitrification reducing agent injection apparatus, SNCR liquid denitrification reducing agents injection apparatus, which is set on, to be included between boiler-burner and burnout degree
Flame reduction atmosphere zones and boiler furnace furnace arch, furnace nose lower area and/or furnace outlet horizontal flue front wall, SNCR
Gaseous state denitrification reducing agent injection apparatus is the porous pipe network or antipriming pipe on the vertical section of flue in horizontal flue region
Road.
2. flue gas high concentrate NOx as described in claim 1 realizes the device of minimum discharge, it is characterised in that：Set on flame also
The SNCR liquid denitrification reducing agent injection apparatus of originality atmosphere zones is apart from boiler combustion exhausted wind 2m-4m.
3. flue gas high concentrate NOx as described in claim 1 realizes the device of minimum discharge, it is characterised in that：Set on flame also
The SNCR liquid denitrification reducing agent injection apparatus of originality atmosphere zones does not use compressed air to be atomized.
4. flue gas high concentrate NOx as described in claim 1 realizes the device of minimum discharge, it is characterised in that：SNCR gaseous states take off
The pipe network of nitre reducing agent injection apparatus or pipeline tapping direction are consistent with flue gas flow direction, open pore size 3-10mm.
5. flue gas high concentrate NOx as described in claim 1 realizes the device of minimum discharge, it is characterised in that：Coal is saved in boiler
Arrangement SCR gaseous state denitrification reducing agent injection apparatus and SCR denitration in flue between device and air preheater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721417055.8U CN207462967U (en) | 2017-10-30 | 2017-10-30 | A kind of flue gas high concentrate NOx realizes the device of minimum discharge |
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| CN201721417055.8U CN207462967U (en) | 2017-10-30 | 2017-10-30 | A kind of flue gas high concentrate NOx realizes the device of minimum discharge |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107715668A (en) * | 2017-10-30 | 2018-02-23 | 东方电气集团东方锅炉股份有限公司 | A kind of flue gas high concentrate NOx realizes the device of minimum discharge |
| CN112963827A (en) * | 2021-04-16 | 2021-06-15 | 西安热工研究院有限公司 | Power station pulverized coal boiler with double-hearth structure and with deep and wide load adjusting characteristics |
| CN114017790A (en) * | 2021-11-03 | 2022-02-08 | 山东钢铁集团日照有限公司 | Multi-gas mixed combustion boiler for denitration |
-
2017
- 2017-10-30 CN CN201721417055.8U patent/CN207462967U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107715668A (en) * | 2017-10-30 | 2018-02-23 | 东方电气集团东方锅炉股份有限公司 | A kind of flue gas high concentrate NOx realizes the device of minimum discharge |
| CN112963827A (en) * | 2021-04-16 | 2021-06-15 | 西安热工研究院有限公司 | Power station pulverized coal boiler with double-hearth structure and with deep and wide load adjusting characteristics |
| CN114017790A (en) * | 2021-11-03 | 2022-02-08 | 山东钢铁集团日照有限公司 | Multi-gas mixed combustion boiler for denitration |
| CN114017790B (en) * | 2021-11-03 | 2024-06-18 | 山东钢铁集团日照有限公司 | Multiple gas mixed combustion boiler for denitration |
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