CN207478284U - A kind of two-stage SNCR denitration system - Google Patents
A kind of two-stage SNCR denitration system Download PDFInfo
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- CN207478284U CN207478284U CN201721343343.3U CN201721343343U CN207478284U CN 207478284 U CN207478284 U CN 207478284U CN 201721343343 U CN201721343343 U CN 201721343343U CN 207478284 U CN207478284 U CN 207478284U
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Abstract
The utility model provides a kind of denitrating system of two-stage SNCR, the residing time in furnace of reducing agent can be effectively increased, improves the mixed effect of reducing agent and flue gas, and promotes the quick progress of low temperature section reduction reaction, and then SNCR denitration efficiency is greatly improved, there is considerable economy and environmental benefit.The system comprises boilers, after boiler furnace arch, furnace nose at horizontal flue arranged in series two stage cyclone separator, the first order SNCR denitration reactor and second level SNCR denitration reactor being respectively arranged before two cyclone separators, the port of export connection exit flue of rear stage cyclone separator；The branched main jet rifle of setting in first order Benitration reactor is in uniformly multi-tier arrangement on the cross section of horizontal flue；It is provided in the Benitration reactor of the second level and mends ammonia spray gun, along the cross sectional arrangement in horizontal flue.
Description
Technical field
The utility model is related to boilers and SNCR denitration device to lay, specially a kind of two-stage SNCR denitration system.
Background technology
Nitrogen oxides is one of major pollutants of discharged from coal-fired boiler, and State Ministry of Environmental Protection is to the row of nitrogen oxides in recent years
It is more stringent to put standard requirement, merely by low-NO_x combustion technology, environmental requirement can not be met, there is an urgent need for seek it is a kind of efficiently and
Economic denitrating flue gas scheme.
Currently used gas denitrifying technology mainly has SCR denitrating flue gas method and SNCR denitrating flue gas methods.SCR flue gases take off
Nitre method is in 300~400 DEG C of temperature ranges, using ammonia as reducing agent under the effect of the catalyst, is occurred also with nitrogen oxides
Original reaction, and then remove the nitrogen oxides in flue gas.Although SCR technology denitration efficiency is higher, due to being needed in reaction process
The participation of catalyst, operating cost is higher, and economy is poor.And without the effect of catalyst in SNCR denitration reaction process, it will
The amino reductives such as urea are sprayed into the region that in-furnace temperature is 850 DEG C~1100 DEG C, you can by the nitrogen oxides in flue gas also
For original into nitrogen and water, initial cost and operating cost are relatively low.For economical reasons, in the premise for meeting environmental protection standard
Under, selection SNCR gas denitrifying technologies preferably.
Researcher is directed to the mixing effect for how extending SNCR denitration reducing agent residing time in furnace, raising reducing agent and flue gas
Fruit provides different solutions, a kind of SNCR denitration system and waste incineration as disclosed in Chinese patent CN201510494130.X
Boiler installs flow spoiler additional in SNCR spray guns downstream, and flow spoiler is sprayed to form the rough air opposite with flow of flue gas direction, be passed through
Rough air increases the residence time of reducing agent, and strengthens the mixed effect of reducing agent and flue gas, so as to improve denitration effect
Rate.A kind of for another example grate furnace SNCR denitration device disclosed in Chinese patent CN201510329157.3, external SNCR denitration reaction
Flue leads to flue gas at furnace outlet outside boiler, and burner hearth is led back again after completing denitration reaction, so as to SNCR denitration technique
Enough reaction compartments are provided, while increase the incorporation time of reducing agent and flue gas, and then improve SNCR denitration efficiency.So
And system above is limited by furnace inner space, increases residence time effect unobvious.The denitration efficiency of SNCR technologies can only reach at present
To 40%~60% or so, need to be further improved.
Utility model content
For in existing SNCR denitration technology there are denitration efficiency it is low the problem of, the utility model provides a kind of two-stage SNCR
Denitrating system, the residing time in furnace of reducing agent can be effectively increased, improve the mixed effect of reducing agent and flue gas, and promoted low
The quick progress of warm area section reduction reaction, and then SNCR denitration efficiency is greatly improved, there is considerable economy and environmental benefit.
The utility model is to be achieved through the following technical solutions：
A kind of two-stage SNCR denitration system, including boiler, the two-stage of arranged in series is revolved at horizontal flue after boiler furnace arch, furnace nose
Wind separator, the first order SNCR denitration reactor being respectively arranged before two cyclone separators and the reaction of second level SNCR denitration
Device, the port of export connection exit flue of rear stage cyclone separator；The branched main jet rifle of setting in first order Benitration reactor, in water
It is in uniformly multi-tier arrangement on the cross section of flat flue；It is provided in the Benitration reactor of the second level and mends ammonia spray gun, along in horizontal cigarette
The cross sectional arrangement in road.
Preferably, it is provided with low NO in the boiler side walls；Screen formula overheat is provided at the top of the boiler
Device.
Preferably, convection superheater, reheater, economizer and air preheat are disposed in the exit flue
Device.
Preferably, it further includes：Slag cooler；The input terminal of slag cooler connects Cyclone outlet and burner hearth bottom respectively
Slag-drip opening, the outlet connection Ash water crawler belt of slag cooler.
Preferably, methane spout is further included, the input terminal of methane spout is connected with methane storage tank, and the outlet of methane spout connects
It is connected in the SNCR denitration reactor inlet flue of the second level.
Preferably, the input terminal of main jet rifle is sequentially connected the first metering module, first flowmeter and the first control valve；First
The input terminal connection amino acid solution of control valve；
Preferably, the input terminal for mending ammonia spray gun is sequentially connected the second metering module, second flowmeter and the second control valve；The
The input terminal connection amino acid solution of two control valves, control terminal connect the output terminal of laser detector；The laser detector is set
It puts in the outlet of previous stage cyclone separator, for measuring the concentration of NOx.
Preferably, a manually-operated gate is respectively provided with before every main jet rifle and benefit ammonia spray gun, all manually-operated gate apertures are identical.
Compared with prior art, the utility model has technique effect beneficial below：
The utility model is sequentially arranged two-stage SNCR denitration reactor after furnace arch, furnace nose on horizontal flue, first order SNCR takes off
Nitre reactor sets branched main jet rifle, and ammonia spraying amount is controlled by unit load, is set in first order SNCR denitration reactor outlet
One group of laser detector measures first order SNCR denitration reactor exit NOx concentration, according to NOx concentration signal reality
When adjustment second level SNCR denitration reactor in mend ammonia spray gun ammonia spraying amount.Two-stage SNCR denitration reactor is set, it can be to cigarette
Gas carries out denitration twice, so as to substantially reduce nitrogen oxide emission；In addition, the unreacted in first order SNCR denitration reactor
Ammonia can completely be reacted in the SNCR denitration reactor of the second level, so as to effectively reducing the escaping of ammonia.
A cyclone separator is respectively arranged after two-stage SNCR denitration reactor simultaneously, sprays into the flue gas of denitrification reducing agent
During into cyclone inlet, due to the effect of contraction of barrel, air-flow will be transformed into circular motion, rotary pneumatic by linear motion
It is helically downward to flow tight wall.When rotating downward air-flow and reaching a certain position in cone lower end, due to air-flow inside and outside cone cylinder
Differential pressure action makes air-flow be drawn close to separator center, and final air-flow by cyclone separator upper outlet by lower counter steer, being arranged
Go out.This process substantially prolongs the time of contact of SNCR denitration reducing agent and flue gas, and improves the mixed of reducing agent and flue gas
Effect is closed, and then substantially increases the denitration efficiency of SNCR denitration reaction, with good economic efficiency and environmental benefit.
Further, methane spout, methane spout are set after first order Benitration reactor, before the Benitration reactor of the second level
Input terminal and CH4Storage tank connects.Since flue gas is in first order SNCR denitration reactor and its latter linked cyclone separator
Smoke temperature can be caused to lose in flow process, make Cyclone outlet temperature that may be less than the optimum temperature of SNCR denitration reaction
Section ultimately causes second level SNCR denitration reaction efficiency and declines.The addition of methane additive can reduce SNCR denitration reaction
Temperature range, improve reduction reaction rate, make SNCR denitration reaction at relatively low temperature also can fast reaction, from
And denitration efficiency reaches more than 85%, and effectively reduces the escaping of ammonia.
Description of the drawings
Fig. 1 is the structure diagram of two-stage SNCR denitration system described in the utility model.
Fig. 2 is two-stage SNCR denitration system ammonia spraying amount control loop described in the utility model.
In figure：1- methane storage tanks；2- low NOs；3- first order SNCR denitration reactors；4- cyclone separators；5-
Two level SNCR denitration reactor；6- laser detectors；7- methane spouts；8- pendant superheaters；9- convection superheaters；10- is again
Hot device；11- economizers；12- air preheaters；13- slag coolers；The first metering modules of 31-；32- first flowmeters；33- first
Control valve；34- main jet rifles；The second metering modules of 51-, 52- second flowmeters, the second control valves of 53-, 54- mend ammonia spray gun.
Specific embodiment
The utility model is described in further detail with reference to specific embodiment, described is to the utility model
Explanation rather than restriction.
As shown in Figure 1, a kind of SNCR denitration system of the utility model, including low NO 2, pendant superheater 8, first
Grade SNCR denitration reactor 3, cyclone separator 4, convection superheater 9, reheater 10, saves second level SNCR denitration reactor 5
Coal device 11, air preheater 12 and slag cooler 13.
The burner hearth fuel combustion of boiler is by low NO 2 using low-NO_x combustion technology, upper furnace ceiling arrangement
Pendant superheater 8.At the horizontal flue of burner hearth furnace arch, furnace nose rear, arranged in series first order SNCR denitration reactor 3, the second level
SNCR denitration reactor 5.A rotation is respectively arranged after first order SNCR denitration reactor 3, second level SNCR denitration reactor 5
Wind separator 4.Convection superheater 9 and reheater 10 are arranged in tail vertical well top.Arrange slag cooler 13 to cyclone separator 4
The lime-ash discharged in lime-ash and stove after separation is cooled down, and dragveyer is drained by Ash water crawler belt after cooling.
Wherein, the smoke inlet of first order SNCR denitration reactor 3 is connected with the outlet flue of boiler, and first order SNCR denitration is anti-
Device 3 is answered to be connected with the outlet flue of second level SNCR denitration reactor 5 with the smoke inlet of corresponding cyclone separator 4.Such as Fig. 2 institutes
Show, branched main jet rifle 34 is arranged in first order Benitration reactor 3, and the input terminal of main jet rifle 34 is sequentially connected the first metering module
31st, 32 and first control valve 33 of first flowmeter；The input terminal connection amino acid solution of first control valve 33,34 ammonia spraying amount of main jet rifle
It is controlled by boiler load；Arrange that quantity is less than the benefit ammonia spray gun 54 of main jet rifle 34, mends ammonia spray gun 54 in second level Benitration reactor 5
Input terminal be sequentially connected the second metering module 51,52 and second control valve 53 of second flowmeter；The input of second control valve 53
End connection amino acid solution, control terminal connect the output terminal of laser detector 6, mend the ammonia spraying amount of ammonia spray gun 54 by laser detector 6
The NOx concentration control detected；The laser detector 6 is arranged in the outlet of first order Benitration reactor 3.Every main jet
A manually-operated gate is respectively provided with before rifle 34 and benefit ammonia spray gun 54, all manually-operated gate apertures are identical.When unit load increases, increase
Add the ammonia spraying amount of each main jet rifle 34 in first order SNCR, it is on the contrary then reduce spray ammonia.When laser detector 6 detects NOx concentration liter
Gao Shi, it is appropriate to increase the ammonia spraying amount that ammonia spray gun 54 is respectively mended in the SNCR of the second level, on the contrary then appropriate less spray ammonia.Boiler combustion generates
Flue gas denitration is completed by the SNCR denitration reactor and cyclone separator 4 of two-stage series connection.
By setting two-stage SNCR denitration reactor at furnace outlet horizontal flue, flue gas can be taken off twice
Nitre, and a cyclone separator 4 is respectively arranged after every grade of SNCR denitration reactor, the flue gas of reducing agent is sprayed into cyclonic separation
Disturbance enhancing, improves the mixed effect of reducing agent and flue gas, denitration efficiency can be made to reach more than 85% in device 4.In addition,
Unreacted ammonia can completely react in second level SNCR denitration reactor 5 in level-one SNCR denitration reactor 3, so as to have
Effect reduces the escaping of ammonia.
After first order Benitration reactor 3, methane spout 7 is set before second level Benitration reactor 5, methane spout 7 it is defeated
Enter end to connect with methane storage tank 1, the outlet of methane spout 7 is connected in 5 gas approach of second level SNCR denitration reactor.Due to
Flue gas can cause smoke temperature to lose in first order SNCR denitration reactor 3 and its latter linked cyclone separator 4 in flow process,
Make 4 outlet temperature of cyclone separator that may be less than the optimum temperature section of SNCR denitration reaction, ultimately cause second level SNCR
Denitration reaction efficiency declines.The addition of methane additive can reduce the temperature range of SNCR denitration reaction, improve reduction reaction
Rate, make SNCR denitration reaction at relatively low temperature also can fast reaction, reach more than 85% so as to denitration efficiency,
And effectively reduce the escaping of ammonia.
Since the denitration efficiency of SNCR is by temperature, CO concentration, NOx initial values, ammonia nitrogen ratio, residence time, mixed effect, addition
The influence of the factors such as agent.When improving stop of the reducing agent in suitable temperature range by the two stage cyclone separator of series connection
Between, strengthen the mixed effect of reducing agent and flue gas, reducing agent can be made more abundant with reaction of nitrogen oxides, so as to greatly improve
SNCR denitration efficiency.Again by adding in the additives such as methane before second of denitration, the suitable of SNCR denitration reaction can be reduced
Temperature makes it remain to reach higher denitration efficiency in relatively low temperature range, so as to SNCR denitration system and take off
Nitre system optimizes, and SNCR denitration efficiency is made to reach more than 85%.
The utility model includes the following steps when in use,
Step 1, the flue gas in boiler furnace, the first order SNCR through being connected at the horizontal flue of burner hearth furnace arch, furnace nose rear take off
Nitre reactor 3 carries out a denitration process；The ammonia spraying amount of branched main jet rifle 34 in first order SNCR denitration reactor 3 is by boiler
Load is controlled；Disturbance is realized to reducing agent and flue gas by previous stage cyclone separator 4 during denitration process；
Step 2, the flue gas after a denitration enters second level SNCR denitration reactor 5 and carries out secondary denitration process；Second
The ammonia spraying amount for mending ammonia spray gun 54 in grade SNCR denitration reactor 5 is true by first order SNCR denitration 3 exit NOx concentrations of reactor
It is fixed；Disturbance is realized to reducing gas and flue gas by rear stage cyclone separator 4 during secondary denitration process；
Step 3, the flue gas after secondary denitration process is successively through convection superheater 9, reheater 10, economizer 11 and air
Preheater 12 is discharged after cooling down.
Wherein, the flue gas after a denitration process through injection mix methane after, into second level SNCR denitration reactor into
The secondary denitration process of row.
Claims (8)
1. a kind of two-stage SNCR denitration system, which is characterized in that including boiler, arranged in series at horizontal flue after boiler furnace arch, furnace nose
Two stage cyclone separator (4), the first order SNCR denitration reactor (3) and being respectively arranged before two cyclone separators (4)
Two level SNCR denitration reactor (5), the port of export connection exit flue of rear stage cyclone separator (4)；
The branched main jet rifle (34) of setting in first order Benitration reactor (3) is in uniformly multilayer on the cross section of horizontal flue
Arrangement；It is provided in second level Benitration reactor (5) and mends ammonia spray gun (54), along the cross sectional arrangement in horizontal flue.
2. a kind of two-stage SNCR denitration system as described in claim 1, which is characterized in that be provided in the boiler side walls
Low NO (2)；Pendant superheater (8) is provided at the top of the boiler.
3. a kind of two-stage SNCR denitration system as described in claim 1, which is characterized in that set successively in the exit flue
It is equipped with convection superheater (9), reheater (10), economizer (11) and air preheater (12).
4. a kind of two-stage SNCR denitration system as described in claim 1, which is characterized in that further include：Slag cooler (13)；Cold slag
The input terminal of device (13) connects cyclone separator (4) outlet and burner hearth bottom slag-drip opening respectively, and the outlet of slag cooler (13) connects
Ash accepting conveys crawler belt.
5. a kind of two-stage SNCR denitration system as described in claim 1, which is characterized in that further include methane spout (7), methane
The input terminal of spout (7) is connected with methane storage tank (1), and the outlet of methane spout (7) is connected to second level SNCR denitration reactor
(5) in gas approach.
6. a kind of two-stage SNCR denitration system as described in claim 1, which is characterized in that the input terminal of main jet rifle (34) is successively
Connect the first metering module (31), first flowmeter (32) and the first control valve (33)；The input terminal of first control valve (33) connects
Connect amino acid solution.
7. a kind of two-stage SNCR denitration system as described in claim 1, which is characterized in that mend the input terminal of ammonia spray gun (54) according to
The second metering module of secondary connection (51), second flowmeter (52) and the second control valve (53)；The input terminal of second control valve (53)
Connect amino acid solution, the output terminal of control terminal connection laser detector (6)；The laser detector (6) is arranged on previous stage
In the outlet of cyclone separator, for measuring the concentration of NOx.
8. a kind of two-stage SNCR denitration system as described in claim 1, which is characterized in that every main jet rifle (34) and benefit ammonia spray
A manually-operated gate is respectively provided with before rifle (54), all manually-operated gate apertures are identical.
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| CN201721343343.3U CN207478284U (en) | 2017-10-18 | 2017-10-18 | A kind of two-stage SNCR denitration system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107551783A (en) * | 2017-10-18 | 2018-01-09 | 中国华能集团公司 | A kind of two-stage SNCR denitration system and method |
| CN109999630A (en) * | 2019-05-08 | 2019-07-12 | 武汉立为工程技术有限公司 | A kind of SNCR denitration system |
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- 2017-10-18 CN CN201721343343.3U patent/CN207478284U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107551783A (en) * | 2017-10-18 | 2018-01-09 | 中国华能集团公司 | A kind of two-stage SNCR denitration system and method |
| CN107551783B (en) * | 2017-10-18 | 2023-10-20 | 中国华能集团公司 | Two-stage SNCR denitration system and method |
| CN109999630A (en) * | 2019-05-08 | 2019-07-12 | 武汉立为工程技术有限公司 | A kind of SNCR denitration system |
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