CN209302522U - A kind of SNCR denitration device - Google Patents
A kind of SNCR denitration device Download PDFInfo
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- CN209302522U CN209302522U CN201822088126.5U CN201822088126U CN209302522U CN 209302522 U CN209302522 U CN 209302522U CN 201822088126 U CN201822088126 U CN 201822088126U CN 209302522 U CN209302522 U CN 209302522U
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- atomizing lance
- transfer pipeline
- pipeline
- air channel
- secondary air
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Abstract
The utility model belongs to flue gas processing device technical field, more particularly to a kind of SNCR denitration device, including secondary air channel and atomizing lance, the atomizing lance is arranged at secondary air channel air nozzle, the atomizing lance is linked with feeder and liquid feed device, the liquid feed device includes the transfer pipeline, solution feed pump and liquid reserve tank of successively connection, the transfer pipeline and atomizing lance connection, is linked with flusher on the transfer pipeline.The utility model is by tangentially spraying into urea liquid in CFB boiler secondary air channel tilting section, denitration reaction is directly carried out in burner hearth high-temperature region, is solved between CFB boiler starting and low load region, SNCR reaction temperature is not achieved in boiler smoke temperature, urea reaction low efficiency, the problem of denitration difficulty.
Description
Technical field
The utility model belongs to flue gas processing device technical field, and in particular to a kind of SNCR denitration device.
Background technique
In China's active service fired power generating unit, occupy nearly 20% equipped with the generating set of circulating fluidized bed boiler
Share, installed capacity are suitable for all circulating fluidized bed boiler close to 200,000,000 KWh, the technology, join to circulating fluidized bed boiler environmental protection
Several control especially has very important dissemination in effective control of start-up course and underload section boiler NOX.
With the rapid economic development in China, environmentally friendly problem is increasingly taken seriously.Enterprise is processed as the important energy
Industry, thermal power generation play very important effect in the production development in China.The clean manufacturing and environmental protection power generation of thermal power generation
It is imperative, it is the indispensable link on sustainable development path.The national revised pollutant emission standard of thermal power plant,
Coal-burning power plant's emission level is asked to reach the standard of plant gas, abbreviation minimum discharge standard.New standard makes Thermal Power Enterprises
Existence threshold it is higher, also accelerate the industry optimzing of Thermal Power Generation Industry, develop clean electric power generation technology, eliminate and restrict thermoelectricity development
All pay no attention to factor and backward production facilities.The energy enterprise under energy-saving and emission-reduction optimization is realized preferably to develop.Recirculating fluidized bed is
It is commercialized higher clean coal combustion technology, due to its unique combustion system, compared to traditional coal-powder boiler, recirculating fluidized bed pot
Stove has advantageous inexpensive pollutant catabolic gene advantage.This is also the main reason for circulating fluidized bed boiler development is swift and violent.
Circulating fluidized bed boiler generallys use SNCR denitration technology, and relative to traditional coal-powder boiler SCR denitration technology, SNCR technology has
Without using catalyst, occupied area is small, equipment investment is few, operation cost is low, and operation operation requires low advantage.
The basic principle of SNCR is to spray in the case where no catalyst to 850 DEG C of -1150 DEG C of cyclone inlets
Enter reducing agent ammonia or urea, is reacted with the NOx in flue gas to reducing agent " selective " and generate nontoxic, free of contamination N2
And H2O.But in the actual production process, since the advantage of new energy emerges, frequent 50% rated load of tape splicing of fired power generating unit is very
To the lower load setting of meeting.In low load region, the flue-gas temperature of cyclone separator is extremely difficult to 850 DEG C or more.Because of urine
Plain solution reaction temperature is 850-1150 DEG C, and reaction efficiency is decreased obviously when lower than 800 DEG C, lower than 750 DEG C hereinafter, urea pyrolysis
Effect is deteriorated, but also along with other harmful chemical reactions, the escaping of ammonia is greatly increased, so not only denitration efficiency reduces,
Denitration difficulty increases, and can also generate corrosion and damage to boiler back end ductwork.Underload urea reaction inefficiency denitration efficiency
Difference, exceeded environmentally friendly parameter is universal phenomenon possessed by current CFB boiler and problem.
Utility model content
In view of the above technical problems, the utility model provides a kind of SNCR denitration device, which can satisfy
Temperature needed for denitration reaction, and can avoid pipeline crystallization.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model are as follows:
A kind of SNCR denitration device, including secondary air channel and atomizing lance, the atomizing lance setting are sprayed in secondary air channel
At air port, the atomizing lance is linked with feeder and liquid feed device, and the liquid feed device includes the delivery pipe of successively connection
Road, solution feed pump and liquid reserve tank, the transfer pipeline and atomizing lance connection are linked with flusher on the transfer pipeline.
The flusher includes flushing cisterns and flushing pump, and the outlet of flushing pump passes through pipeline and transfer pipeline connection, punching
Wash the import and flushing cisterns connection of pump.
The pipeline is externally provided with insulating layer.
The atomizing lance is coupled by flange with secondary air channel.
The flange is set on atomizing lance, and flange is equipped with corresponding through-hole；Pass through spiral shell on the atomizing lance
Line connection has the first adjusting nut and the second adjusting nut for mounting flange, and the flange is located at the first adjusting nut and the
Between two adjusting nuts.
The material of the transfer pipeline uses 304 stainless steels.
Compared with prior art, what is had effective is the utility model:
The utility model is straight in burner hearth high-temperature region by tangentially spraying into urea liquid in CFB boiler secondary air channel tilting section
Row denitration reaction is tapped into, is solved between CFB boiler starting and low load region, SNCR reaction temperature is not achieved in boiler smoke temperature,
Urea reaction low efficiency, the problem of denitration difficulty.
Urea supply system is rinsed using demineralized water, prevents remaining urea crystals in pipeline.Lead on atomizing lance
Crossing thread connection has the first adjusting nut and the second adjusting nut for mounting flange, can regulating flange according to the actual situation
With the relative position of atomizing lance, to change the built-in length of atomizing lance.
Detailed description of the invention
Fig. 1 is the principles of the present invention figure；
Fig. 2 is the scheme of installation of the utility model；
Fig. 3 is the cross-sectional view of the utility model；
Fig. 4 is the structural schematic diagram of the utility model atomizing lance；
Wherein: 1 is secondary air channel, and 2 be flushing water wicket, and 3 adjust door for flushing water, and 4 is rinse water ga(u)ge, and 5 are
Flushing water electric check valve, 6 be flushing water non-return flap, and 7 be atomizing lance, and 8 be atomization wind hand stop valve, and 9 is inverse for atomization wind
Only door, 10 be urea liquid hand stop valve, and 11 be urea pipe strainer, and 12 be urea liquid pipeline non-return flap, and 13 be urea
Liquid inventory meter, 14 be urea liquid pipeline sewage door, and 15 adjust door for urea liquid, and 16 be urea liquid electric check valve,
17 be transfer pipeline, and 18 be solution feed pump, and 19 be liquid reserve tank, and 20 be flushing cisterns, and 21 be flushing pump, and 22 be pipeline, and 23 be flange, 24
It is the second adjusting nut for the first adjusting nut, 25.
Specific embodiment
The technical scheme in the utility model embodiment is clearly and completely described below, it is clear that described reality
Applying example is only the utility model a part of the embodiment, instead of all the embodiments.Based on the embodiments of the present invention,
Every other embodiment obtained by those of ordinary skill in the art without making creative efforts, belongs to this reality
With novel protected range.
As shown in Figure 1, a kind of SNCR denitration device, including secondary air channel 1 and atomizing lance 7, atomizing lance 7 are arranged two
At secondary 1 air nozzle of air hose, atomizing lance 7 is linked with feeder and liquid feed device.Atomizing lance 7 is using common in the art
Denitration spray gun structure；Feeder is mainly to provide compressed air, structure in the prior art can be used, or can be straight
It is connected to industrial compressed air, compressed air dew point is not above -40 DEG C.
Liquid feed device specifically includes the transfer pipeline 17, solution feed pump 18 and liquid reserve tank 19 of successively connection, transfer pipeline 17 with
7 connection of atomizing lance.Solution feed pump 18 preferably uses multistage frequency conversion centrifugal pump, adjustable urea liquid pressure size, by defeated
Send pipeline 17 connection, urea liquid to the atomizing lance 7 turned in liquid reserve tank 19 finally sprays into burner hearth.
It is linked with flusher on transfer pipeline 17, atomizing lance 7 can be rinsed by flusher, prevent pipe
Remaining urea crystals in road.The structure of flusher can be adjusted according to the actual situation and design, no matter using which kind of knot
Structure, as long as flushing action can be played.
When putting into operation, feeder will be opened first, compressed air is provided, pressure appropriate is adjusted by manually operated door.Starting
Urea is sprayed into secondary air channel 1 by atomizing lance 7 by liquid feed device.According to the index situation of boiler emission NOX, by adjusting
Urea liquid controls the flow of urea liquid, to make boiler emission NOX for the aperture and monitoring urea liquid flowmeter of bin gate
Control is in national regulation acceptability limit.
When urea spray gun stops working, start flush water pump, open flushing water to urea pipe (transfer pipeline 17) and
Atomizing lance 7 carries out flushing in 5 minutes, prevents remaining urea liquid from crystallizing in pipeline.
Specific: flusher includes flushing cisterns 20 and flushing pump 21, and the outlet of flushing pump 21 passes through pipeline 22 and conveying
17 connection of pipeline, the import and 20 connection of flushing cisterns of flushing pump 21.The demineralized water of sufficient amount, demineralized water are stored in flushing cisterns 20
By pipeline 22 enter transfer pipeline 17 in, and eventually by atomizing lance 7 spray, using demineralized water to urea supply system into
Row rinses, and prevents remaining urea crystals in pipeline.
Further, for the ease of controling and operating, be successively arranged on transfer pipeline 17 urea liquid electric check valve 16,
Urea liquid adjust door 15, urea liquid pipeline sewage door 14, urea liquid flowmeter 13, urea liquid pipeline non-return flap 12,
Urea pipe strainer 11 and urea liquid hand stop valve 10；It is manual that atomization wind is successively arranged on the air delivering pipeline of compressed air
Shut-off valve 8 and atomization wind non-return flap 9；Flushing water wicket 2, flushing water adjustment door are successively arranged on the pipeline 22 of flusher
3, water ga(u)ge 4, flushing water electric check valve 5 and flushing water non-return flap 6 are rinsed.Meanwhile one can be arranged on transfer pipeline 17
A urea liquid pressure gauge；The also settable corresponding pressure gauge on supply air line.
Above-mentioned transfer pipeline 17, pipeline 22 and air delivering pipeline can be used 304 stainless steels and be made；It is wrapped in pipeline 22
Insulating layer (material) prevents microthermal climate icing in winter from freezing.
The effect of urea atomizing lance 7 is to be atomized urea liquid, keeps denitration reaction speed fast, high-efficient, using compression
Air atomizing, spray gun select 316L material, have good wear-resisting and high-temperature stability.In boiler body and upper layer secondary air channel
The lower part aperture of 1 junction is inserted into urea atomizing lance 7, is bolted with 23 disk of flange, convenient for the maintenance and dimension of spray gun
Shield.
As shown in Figures 2 to 4, further, flange 23 is set on atomizing lance 7, flange 23 is equipped with corresponding through-hole；
The first adjusting nut 24 and the second adjusting nut 25 for mounting flange 23, flange are threaded on atomizing lance 7
23 between the first adjusting nut 24 and the second adjusting nut 25.Using the above structure, it can adjust according to the actual situation, mist
Change the relative position between spray gun 7 and flange 23.
When needing to increase the built-in length of atomizing lance 7, moved it up by unscrewing the first adjusting nut 24, so
After unscrew the second adjusting nut 25 and also move it up, even if flange 23 moves up so that atomizing lance 7 protrudes into length
Degree increases, and plays fixed function by the first adjusting nut 24 and 25 clamping flange 23 of the second adjusting nut.After adjusting, by method
Orchid 23 is connected and fixed with secondary air channel 1 equipped with flange seat, and gasket is arranged in connection place.
When needing to shorten the built-in length of atomizing lance 7, then rotates backward the first adjusting nut 24 and second and adjust spiral shell
Mother 25.
Further, it is possible to which corresponding mark is arranged on atomizing lance 7, mark direction is corresponding with spout direction, is convenient for
Understand the spout direction after atomizing lance protrudes into secondary air channel 1；Mark can be using raised points or mark point etc..
Only the preferred embodiment of the utility model is explained in detail above, but the utility model be not limited to it is above-mentioned
Embodiment can also not depart from the utility model aims within the knowledge of a person skilled in the art
Under the premise of various changes can be made, various change should be included within the scope of protection of this utility model.
Claims (6)
1. a kind of SNCR denitration device, it is characterised in that: including secondary air channel (1) and atomizing lance (7), the atomizing lance
(7) it is arranged at secondary air channel (1) air nozzle, the atomizing lance (7) is linked with feeder and liquid feed device, the feed flow
Device includes the transfer pipeline (17), solution feed pump (18) and liquid reserve tank (19) of successively connection, the transfer pipeline (17) and atomization
Spray gun (7) connection is linked with flusher on the transfer pipeline (17).
2. a kind of SNCR denitration device according to claim 1, it is characterised in that: the flusher includes flushing cisterns
(20) and flushing pump (21), the outlet of flushing pump (21) pass through pipeline (22) and transfer pipeline (17) connection, flushing pump (21)
Import and flushing cisterns (20) connection.
3. a kind of SNCR denitration device according to claim 2, it is characterised in that: the pipeline (22) is externally provided with heat preservation
Layer.
4. a kind of SNCR denitration device according to claim 1, it is characterised in that: the atomizing lance (7) passes through flange
(23) couple with secondary air channel (1).
5. a kind of SNCR denitration device according to claim 4, it is characterised in that: the flange (23) is set on atomization
On spray gun (7), flange (23) is equipped with corresponding through-hole；It has been threaded on the atomizing lance (7) for fixation
First adjusting nut (24) and the second adjusting nut (25) of blue (23), the flange (23) be located at the first adjusting nut (24) and
Between second adjusting nut (25).
6. a kind of SNCR denitration device according to claim 1, it is characterised in that: the material of the transfer pipeline (17) is adopted
With 304 stainless steels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822088126.5U CN209302522U (en) | 2018-12-13 | 2018-12-13 | A kind of SNCR denitration device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822088126.5U CN209302522U (en) | 2018-12-13 | 2018-12-13 | A kind of SNCR denitration device |
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| Publication Number | Publication Date |
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| CN209302522U true CN209302522U (en) | 2019-08-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201822088126.5U Active CN209302522U (en) | 2018-12-13 | 2018-12-13 | A kind of SNCR denitration device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645584A (en) * | 2019-11-26 | 2020-01-03 | 山东中航天业科技有限公司 | Full operating mode flue gas denitration system |
| CN111359414A (en) * | 2020-03-16 | 2020-07-03 | 中国华能集团清洁能源技术研究院有限公司 | CFB boiler deep peak regulation composite type adjustable SNCR denitration system and method |
| CN112403251A (en) * | 2020-12-12 | 2021-02-26 | 江苏徐矿综合利用发电有限公司 | Low-load denitration system of circulating fluidized bed boiler |
-
2018
- 2018-12-13 CN CN201822088126.5U patent/CN209302522U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110645584A (en) * | 2019-11-26 | 2020-01-03 | 山东中航天业科技有限公司 | Full operating mode flue gas denitration system |
| CN111359414A (en) * | 2020-03-16 | 2020-07-03 | 中国华能集团清洁能源技术研究院有限公司 | CFB boiler deep peak regulation composite type adjustable SNCR denitration system and method |
| CN112403251A (en) * | 2020-12-12 | 2021-02-26 | 江苏徐矿综合利用发电有限公司 | Low-load denitration system of circulating fluidized bed boiler |
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