CN208711398U - A kind of denitrating system based on SOFA joint SNCR system - Google Patents
A kind of denitrating system based on SOFA joint SNCR system Download PDFInfo
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Abstract
The utility model provides a kind of denitrating system based on SOFA joint SNCR system, and structure is simple, and rationally, transformation is convenient for design, does not increase additional equipment pipe, is suitable for other fume treatment technologies of use in conjunction, and cost of investment is low, and denitration efficiency is high.The system comprises be arranged at by the SOFA system and SNCR system on denitration boiler；The SOFA system includes the outlet two-way SOFA, and the first SOFA exports the burning-out zone that boiler is arranged in, and the outlet the 2nd SOFA is arranged in the corresponding SNCR reaction zone of reducing agent jet port of SNCR system.
Description
Technical field
The utility model belongs to flue gas nitrogen oxide pollutant removing technical field, is related to a kind of based on SOFA joint SNCR
The denitrating system of system.
Background technique
Depth air classification low NOX combustion in furnace based on separation burnout degree SOFA (Separated Over-Fire Air)
Burning system is that current coal-burning power plant uses a kind of more Researched of Air Staging Combustion Burning Pulverized Coal form.SOFA system is based on separation burnout degree
Technology arranges OFA and SOFA in burner hearth different height, burner hearth is divided into the reducing zone initial combustion NOx and fuel burning-out zone, is passed through
Optimize excess air coefficient, can effectively reduce NOx emission and improve efficiency of combustion to greatest extent.It can be from the source pair that NOx is generated
It is controlled and is reduced, but the NOx generated can not be further processed.
SNCR (SelectiveNon-CatalyticReduction) i.e. selective non-catalytic reduction method denitration technology, benefit
Use NH3, urea etc. as denitrification reducing agent spray into the region that in-furnace temperature is 850~1100 DEG C, NH3It is carried out with the NOx in flue gas
Selective oxidation reduction reaction, NOx are reduced to nitrogen and water.Main chemical reaction:
4NO+4NH3+O2→4N2+6H2O (1)
NO+NO2+2NH3→2N2+3H2O (2)
6NO2+8NH3→7N2+12H2O (3)
Therefore, in SNCR technique, main includes storage, dilution, supply and the pot furnace injection reaction system of reducing agent.
Its denitration efficiency >=50%, ammonia slip concentration < 5mg/Nm3, catalyst is not used, has that cost of investment is low, device is simple, accounts for
The advantages such as ground area is small.But the consumption of SNCR technique reducing agent is higher, is suitble to the lower device of emission reduction index request or as low
The supplement technique of NOx combustion technology.
SNCR is larger to the control difficulty of reaction temperature and residence time, since the temperature range of SNCR reaction is relatively narrow, and
Boiler smoke Temperature Distribution changes when boiler varying duty, it usually needs by flow field analysis, select optimal spray ammonia point with
Spray gun setting, and have coping style to boiler varying duty.So the selection of temperature window is the pass of SNCR reduction NO efficiency
Key.
Temperature is higher, and reducing agent is oxidized to NOx, and the NOx content in flue gas is not reduced to be increased instead；Temperature is lower, instead
It answers insufficient, causes reducing agent to be lost, new pollution is had adverse effect on or even caused to upstream device.So how will
Guarantee former agent and flue gas is sufficiently mixed reaction, guarantees in NH appropriate3Higher NOx reduction rate is obtained when/NO molar ratio, is
Another key technology urgently to be resolved.
It has problems in that nearby flue-gas temperature is higher for the reducing agent eject position of SNCR, and reducing agent is injected into
After cannot play a role immediately with NOx in flue gas, not only waste reducing agent residence time, also cannot get SNCR denitration efficiency
It effectively improves.For large thermal power plant boiler, since the flue gas in burner hearth and reducing agent are difficult to be uniformly mixed, denitrification rate is generally not
Higher than 40%.Meanwhile selecting different reducing agent Applicable temperatures different, such as the temperature range that urea is acted on as reducing agent is slightly
Height, and the temperature range that ammonia is acted on as reducing agent is relatively slightly lower.
Utility model content
Aiming at the problems existing in the prior art, the utility model provides a kind of denitration based on SOFA joint SNCR system
System, structure is simple, and rationally, transformation is convenient for design, does not increase additional equipment pipe, is suitable for other fume treatments of use in conjunction
Technology, cost of investment is low, and denitration efficiency is high.
The utility model is to be achieved through the following technical solutions:
A kind of denitrating system based on SOFA joint SNCR system, including being arranged at by the SOFA system on denitration boiler
With SNCR system；
The SOFA system includes the outlet two-way SOFA, and the first SOFA, which is exported, is arranged in the burning-out zone of boiler, and second
The outlet SOFA is arranged in the corresponding SNCR reaction zone of reducing agent jet port of SNCR system.
Preferably, the outlet the 2nd SOFA is correspondingly arranged gas nozzle, and reducing agent jet port is correspondingly arranged fluid injector, gas
Nozzle and fluid injector are co-located in SNCR reaction zone, and lowest level is gas nozzle in SNCR reaction zone.
Preferably, a second fluid nozzle is shared with corresponding reducing agent jet port per the outlet the 2nd SOFA all the way.
Preferably, SOFA system further includes the SOFA blower with the outlet the first SOFA and the outlet the 2nd SOFA connection air-supply.
It preferably, further include being arranged in be fired system again on denitration boiler, the system of firing again includes being arranged again
Air outlet is fired in combustion area again, and with fire again air outlet connect blow fire blower again.
Preferably, the SNCR system include the distribution module being connected in turn on reducing agent jet port, metering module,
Loop module and reducing agent preparation facilities.
Further, further include automatic control module for controlling metering module and distribution module；Automatic control module
Input terminal connection be arranged in flue flue gas NOx concentration monitoring device；Flue gas NOx concentration monitoring device is arranged after SNCR reaction zone
Flue in.
Compared with prior art, the utility model has technical effect beneficial below:
On the one hand the utility model may be used based on the denitrating system of SOFA joint SNCR system by the joint of two systems
Function is swung up and down with the separation burnout degree that exports using the first SOFA, the effective gas temperature windage for controlling furnace outlet makes
Furnace outlet gas temperature deviation is reduced to 30 DEG C or so, and the reducing agent of SNCR is made to spray into the temperature window that point position is in SNCR；Separately
On the one hand the separation burnout degree and reducing agent drawn using the outlet the 2nd SOFA spray into burner hearth jointly, and SNCR reducing agent is effectively reduced
The temperature of flue gas near eject position increases the probability that denitrification reducing agent comes into full contact with flue gas, obtains SNCR denitration reducing agent
Utilization to the limit ensure that the denitration efficiency of SNCR, can be effectively improved reducing agent near the jet port and in burner hearth
The higher situation of initial temperature of flue gas NOx interaction, makes reducing agent be fully used, reduces the discharge amount of NOx, improves
The economy of boiler operatiopn, so that SNCR efficiency is improved.
Further, it can be transformed according to the case where denitration boiler, does not increase additional equipment pipe, be fitted
Other fume treatment technologies of suitable use in conjunction, before having relatively broad application in the denitration transformation of especially old factory, coal-burning power plant
Scape.
It further, can be by the feedback control of NOx concentration in flue gas, to SNCR system in the denitrating system
In reduction dosage controlled and distributed, preferably improve denitration efficiency.
Detailed description of the invention
Fig. 1 is a kind of denitrating system structural schematic diagram based on SOFA joint SNCR system；
In figure: the reburning zone 1-, 2- burning-out zone, 3- reducing agent preparation facilities, 4- loop module, 5- metering module, 6- distribution
Module, 7- reducing agent jet port, 8-SNCR reaction zone, 9- fire air outlet again, and 101- fires blower, 102-SOFA blower, 11- again
The outlet one SOFA, 12- automatic control module, 13- flue gas NOx concentration monitoring device.
Specific embodiment
The utility model is described in further detail below with reference to specific embodiment, described is to the utility model
Explanation rather than limit.
The utility model combines the separation burnout degree of SOFA system with the injection of the reducing agent of SNCR system, effectively drops
Temperature near low SNCR eject position, is uniformly mixed reducing agent near eject position with flue gas, and increase reducing agent has
The residence time is imitated, to guarantee the denitration efficiency of SNCR, realizes the purpose for reducing NOx discharge.Especially in coal-burning power plant
In the case where underrun, there is boundless application and promotion prospect.
A kind of denitrating system based on SOFA joint SNCR system of the utility model, mainly includes SNCR system and SOFA system
System, SNCR system includes reductant injection system, in which:
Reductant injection system generates denitrification reducing agent by reducing agent preparation facilities 3, and the denitrification reducing agent of generation is successively
By loop module 4 and metering module 5, the reducing agent of various dose is entered into SNCR reaction by jet port by distribution module 6
With the NOx in flue gas reduction reaction occurs for area 8, is finally N by NOx conversion2, reach discharge standard.
SNCR system prepares denitrification reducing agent using urea method, passes through spray by the reducing agent that reducing agent preparation system comes
Loophole enters SNCR reaction zone 8, and redox reaction occurs with the NOx in flue gas, is finally translated into N2Reach discharge standard.
Wherein SOFA system distance SNCR eject position is closer, and the outlet the first SOFA 11 uses the separation after-flame of horizontal hunting
Wind design, effectively adjusts the mixed process of SOFA and extension, controls unburned carbon in flue dust and furnace outlet gas temperature deviation.Meanwhile it is logical
It crosses the outlet the 2nd SOFA reference SOFA and reducing agent shares a jet port or sprays in same layer, is i.e. the reducing agent in SNCR system
The SOFA spout that eject position increases one or splits, not only can solve SNCR eject position, nearby initial temperature is higher, also
Former agent mixes non-uniform problem near eject position with flue gas, reducing agent can also be made to play a role in advance, increases reduction
The agent residence time guarantees that the denitrification reducing agent of SNCR is fully utilized.
Specifically, as shown in Figure 1, a kind of denitrating system based on SOFA joint SNCR system, including SNCR system, SOFA
System and fire again system composition, SNCR system includes being arranged in by the reductant injection system of denitration boiler exterior.
Reducing agent preparation facilities 3, the denitrification reducing agent of generation successively pass through loop module 4, metering module 5 and distribution module
6, the SNCR reaction zone 8 in flue system is entered by reducing agent jet port 7, reduction reaction occurs with the NOx in flue gas, finally
It is N by NOx conversion2, reach discharge standard.
System 9 is fired again, it is different from the SNCR gas denitrifying technology of emission reduction after burning, it is by passing through in combustion
Fuel-staged combustion reduces NOx.Segmentation supply fuel and combustion air in combustion system again forms main combustion section, again in furnace
Fire section, after-flame section these three different burning zones.Combustion air is divided into two stages and is supplied by air zoning, wherein 70%-
90% air supplied burner is known as First air, and rest part just sprays on the burner is known as burnout degree in furnace.SOFA system
System is the air zoning system of separate type burnout degree, fires the offer burnout degree of system 9 again for giving.
The above-mentioned denitrating system application method based on SOFA joint SNCR system are as follows: be arranged simultaneously on by denitration boiler
SOFA system and SNCR system；Air outlet in SOFA system is drawn into reducing agent injection in burnout degree, with SNCR system all the way
The reducing agent of mouth 7 is injected into together in SNCR reaction zone 8.In the burnout degree all the way and SNCR system drawn in SOFA system also
Former agent shares a second fluid nozzle on same access；Or gas nozzle and corresponding reducing agent using corresponding burnout degree
Fluid injector is injected into together in SNCR reaction zone 8.The aperture and angle that SOFA wind is introduced by adjusting, by SNCR reducing agent
Nearby flue-gas temperature is reduced within 1000 DEG C ± 100 DEG C entrance.
SOFA wind rate is to determine that burnout degree technology reduces the key factor of NOx concentration, is commonly designed SOFA air quantity lower than total
The 30% of air quantity, can be by inclined come the temperature for changing denitrification reducing agent entrance to the aperture and angular adjustment that introduce SOFA air quantity
Difference.Suitable denitration temperature is generally at 900 DEG C -1100 DEG C, and temperature is too low to decline denitration efficiency, unreacted NH3With flue gas
Discharge causes secondary pollution, and the excessively high reducing agent of temperature, which is oxidized to NOx, reduces denitration efficiency.And under oepration at full load operating condition,
The flue-gas temperature of the reducing agent entrance band of position is often higher than the temperature window of SNCR denitration, for example, certain SNCR reducing agent sprays
1300 DEG C of entrance flue-gas temperature, the aperture and angle of SOFA wind are introduced by adjusting, this regional temperature range can be dropped
Within 1000 DEG C ± 100 DEG C, total ammonia nitrogen molar ratio 1:1 sprays into the reducing agent of volumetric concentration 15%-45%.
The separation burnout degree of the outlet 2nd SOFA 11, according to 13 data feedback of flue gas NOx density monitoring system, by controlling automatically
Molding block 12 regulates and controls, and distributes by distribution module 6, is injected into flue system together with the reducing agent of reducing agent jet port 7, leads to
Reduction SNCR jet port flue-gas temperature nearby is crossed, reducing agent is uniformly mixed near eject position with flue gas, increases reducing agent
Effective stay time realize the purpose for reducing NOx discharge to guarantee the denitration efficiency of SNCR.
SOFA burnout degree is combined with the injection of reducing agent, the temperature near SNCR eject position is effectively reduced, especially
It is that there is boundless application and promotion prospect in the case where the operation of coal-burning power plant's middle-low load.
The mode that the utility model is implemented is not limited to this.
Claims (7)
1. a kind of denitrating system based on SOFA joint SNCR system, which is characterized in that including being arranged at by denitration boiler
SOFA system and SNCR system；
The SOFA system includes the outlet two-way SOFA, and the outlet the first SOFA (11) is arranged in the burning-out zone (2) of boiler, and second
The outlet SOFA is arranged in the corresponding SNCR reaction zone (8) of reducing agent jet port (7) of SNCR system.
2. a kind of denitrating system based on SOFA joint SNCR system according to claim 1, which is characterized in that second
The outlet SOFA is correspondingly arranged gas nozzle, and reducing agent jet port (7) is correspondingly arranged fluid injector, and gas nozzle and fluid injector are total
With setting in SNCR reaction zone (8), SNCR reaction zone (8) interior lowest level is gas nozzle.
3. a kind of denitrating system based on SOFA joint SNCR system according to claim 1, which is characterized in that per all the way
The 2nd SOFA outlet and corresponding reducing agent jet port (7) share a second fluid nozzle.
4. a kind of denitrating system based on SOFA joint SNCR system according to claim 1, which is characterized in that SOFA system
System further includes the SOFA blower (102) with the outlet the first SOFA (11) and the outlet the 2nd SOFA connection air-supply.
5. a kind of denitrating system based on SOFA joint SNCR system according to claim 1, which is characterized in that further include
It is arranged in and is fired system again on denitration boiler, the system of firing again includes being arranged to fire air outlet again in reburning zone (1)
(9), and with fire again air outlet (9) connect air-supply fire blower (101) again.
6. a kind of denitrating system based on SOFA joint SNCR system according to claim 1, which is characterized in that described
SNCR system includes distribution module (6), metering module (5), the loop module (4) being connected in turn on reducing agent jet port (7)
With reducing agent preparation facilities (3).
7. a kind of denitrating system based on SOFA joint SNCR system according to claim 6, which is characterized in that further include
For controlling the automatic control module (12) of metering module (5) and distribution module (6)；The input terminal of automatic control module (12) connects
It connects and flue gas NOx concentration monitoring device (13) is set in flue；Flue gas NOx concentration monitoring device (13) is arranged in SNCR reaction zone (8)
In flue afterwards.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821298780.2U CN208711398U (en) | 2018-08-13 | 2018-08-13 | A kind of denitrating system based on SOFA joint SNCR system |
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| CN201821298780.2U CN208711398U (en) | 2018-08-13 | 2018-08-13 | A kind of denitrating system based on SOFA joint SNCR system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108905558A (en) * | 2018-08-13 | 2018-11-30 | 中国华能集团有限公司 | A kind of denitrating system and method based on SOFA joint SNCR system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108905558A (en) * | 2018-08-13 | 2018-11-30 | 中国华能集团有限公司 | A kind of denitrating system and method based on SOFA joint SNCR system |
| CN108905558B (en) * | 2018-08-13 | 2024-05-14 | 中国华能集团有限公司 | Denitration system and method based on SOFA (solid State imaging) combined SNCR (selective non-catalytic reduction) system |
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