CN102688681B - Air cooling type air atomization spray gun applicable to denitration by SNCR (selective non-catalytic reduction) method - Google Patents
Air cooling type air atomization spray gun applicable to denitration by SNCR (selective non-catalytic reduction) method Download PDFInfo
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- CN102688681B CN102688681B CN201210167019.6A CN201210167019A CN102688681B CN 102688681 B CN102688681 B CN 102688681B CN 201210167019 A CN201210167019 A CN 201210167019A CN 102688681 B CN102688681 B CN 102688681B
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Abstract
An air cooling type air atomization spray gun applicable to denitration by an SNCR (selective non-catalytic reduction) method comprises a spray gun body and a spray nozzle component, the spray nozzle component is embedded in a scavenging air pipe of the spray gun body, the spray gun body consists of an aqueous solution pipe, one end of the aqueous solution pipe is connected with a reducing agent header, a spray gun head is disposed at the other end of the aqueous solution pipe, one end of an atomized air pipe outside the aqueous solution pipe is connected with an atomized air header, the other end of the atomized air pipe is connected with the spray gun head 3, the scavenging air pipe is disposed between the atomized air pipe and an outer pipe of the spray gun body, one end of the scavenging pipe is connected with a scavenging air header, the aqueous solution pipe is connected with the atomized air pipe by a supporting structure and a detachable connector, the detachable connector is connected with the spray gun body, the spray nozzle component consists of a liquid cap, the liquid cap is connected with an outer threaded connector of the spray gun body, an air cap is connected with the liquid cap and provided with an air cap nozzle. The air cooling type air atomization spray gun has the advantages that adhesion of powder in a front section of a spray nozzle is prevented, and the service life of the spray nozzle is prolonged.
Description
Technical field
The invention belongs to recirculating fluidized bed (CFB) boiler SNCR method (SNCR) denitration applied technical field, be specifically related to the air-cooled type air atomization spray gun of a kind of SNCR of being applicable to method denitration.
Background technology
SNCR denitration technology, at present as one of main flow denitration technology, is suitable for CFBB especially.SNCR denitration technology is in the situation that not adding catalyst, denitrification reducing agent (urea liquid, ammoniacal liquor etc.) is sprayed in the high-temperature flue gas (850 DEG C ~ 1150 DEG C) at burner hearth or other position, with NO
xgeneration selective reduction reaction, product is H
2o and N
2, realize and reduce NO
xdischarge object.
Spray gun is one of nucleus equipment of SNCR denitrating system, and the stable of spray gun performance is to ensure the reducing agent aqueous solution and the well-mixed key of flue gas.At present, the existing spray gun that is applied to SNCR denitrating system mainly contains following several: mechanical atomization spray gun, air atomization spray gun etc.The spray gun of the type is generally applicable to low temperature, high dust concentration or uses at high temperature, high dust concentration environment.When SNCR denitrating system is applied to CFB boiler, its outside environment for use is extremely severe, for high temperature, high flow rate, high ash concentration environment, and reductant solution has caustic corrosion, common spray gun uses with this understanding, easy burn-out, obstruction, and then cause resistance increase, nozzle flow change, atomization mixed effect variation, denitration efficiency reduction, amount of ammonia slip increase etc.
Summary of the invention
In order to overcome the shortcoming of above-mentioned prior art, the object of the present invention is to provide the air-cooled type air atomization spray gun of a kind of SNCR of being applicable to method denitration, in cooling, promote the purging intensity of nozzle, effectively avoid the bonding of dust at nozzle leading portion, can increase substantially the service life of nozzle.
In order to achieve the above object, the present invention adopts technical scheme to be:
A kind of air-cooled type air atomization spray gun that is applicable to the denitration of SNCR method, comprise spray gun body and nozzle assembly, nozzle assembly is embedded in the purging air pipe 12 of spray gun body, spray gun body comprises aqueous suction pipes 1, one end of aqueous suction pipes 1 is provided with aqueous suction pipes joint 2, be connected by the female gas thread of aqueous suction pipes joint 2 and reducing agent, the other end is provided with lance head 3, the outer atomized air tube 11 that is provided with of aqueous suction pipes 1, atomized air tube 11 one end are connected by the female gas thread of atomizing air pipe joint 13 and atomizing air, the other end is connected with lance head 3, between atomized air tube 11 and spray gun body outer tube, be also provided with purging air pipe 12, one end of purging air pipe 12 is connected by the female gas thread of purging air pipe joint 14 and purging air, aqueous suction pipes 1, atomized air tube 11 is connected with the detachable connector 18 with anti-abrasive coatings by supporting construction 15, detachable connector 18 is connected by screw thread 16 with spray gun body, and be provided with the 3rd gasket seal 17,
Nozzle assembly comprises liquid cap 4, liquid cap 4 is connected with spray gun body male connection 5, and is provided with the first gasket seal 6, and air cap 7 is connected by liquid cap male connection 8 with liquid cap 4, and being provided with the second gasket seal 9, air cap 7 is provided with air cap spout 10.
Described supporting construction 15 adopts welding manner to be connected with the aqueous solution 2 and the firm of atomized air tube 11 to ensure purging air pipe 12.
The front end of described purging air pipe 12 is exposed to flue gas partial and scribbles high-temperature wearable layer.
Parts of the present invention adopt stainless steel.
Compared with prior art, the present invention has the following advantages:
1) the present invention is a kind of air-cooled type air atomization spray gun of the CFB of being applicable to boiler SNCR denitrating system, compressed air is entered by purging air pipe 12, top is by dwindling discharge area, form high velocity air, can effective cooling nozzle, make nozzle be in optimum Working, solved the problem of nozzle long term exposure easy scaling loss, obstruction in high-temperature flue gas in the past.
2) by after 12 throttlings of purging air pipe, strengthen the nozzle purging effect of dust stratification around, avoid the residual reductant solution in nozzle place directly to contact with high temperature/high ash concentration flue gas the high temperature corrosion and the adhesion problem that cause.
3) detachable connector 18 of the present invention, liquid cap 4 and air cap 7 can separate with spray gun body easily, and easy to replace and maintain, detachable connector 18 designs abrasion-proof structure, make the present invention have applicability and operability widely.
4) the present invention is a kind of air-cooled type air atomization spray gun of the CFB of being applicable to boiler SNCR denitrating system, and purging air pipe 12 front ends are exposed to flue gas partial and scribble high-temperature wearable layer, have further extended the service life of spray gun.
Brief description of the drawings
Fig. 1 is overall structure schematic diagram of the present invention.
Fig. 2 is spray gun supporting surface cross-sectional view of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in detail.
See figures.1.and.2, a kind of air-cooled type air atomization spray gun that is applicable to the denitration of SNCR method, comprise spray gun body and nozzle assembly, nozzle assembly is embedded in the purging air pipe 12 of spray gun body, spray gun body comprises aqueous suction pipes 1, one end of aqueous suction pipes 1 is provided with aqueous suction pipes joint 2, be connected by the female gas thread of aqueous suction pipes joint 2 and reducing agent, the other end is provided with lance head 3, the outer atomized air tube 11 that is provided with of aqueous suction pipes 1, atomized air tube 11 one end are passed through atomizing air pipe joint 13 and are connected with the female gas thread of atomizing air, the other end is connected with lance head 3, between atomized air tube 11 and spray gun body outer tube, be also provided with purging air pipe 12, one end of purging air pipe 12 is connected by the female gas thread of purging air pipe joint 14 and purging air, aqueous suction pipes 1, atomized air tube 11 is connected with the detachable connector 18 with anti-abrasive coatings by supporting construction 15, detachable connector 18 is connected by screw thread 16 with spray gun body, and be provided with the 3rd gasket seal 17,
Nozzle assembly comprises liquid cap 4, liquid cap 4 is connected with spray gun body male connection 5, and is provided with the first gasket seal 6, and air cap 7 is connected by liquid cap male connection 8 with liquid cap 4, and being provided with the second gasket seal 9, air cap 7 is provided with air cap spout 10.
Described supporting construction 15 adopts welding manner to be connected with the aqueous solution 2 and the firm of atomized air tube 11 to ensure purging air pipe 12.
The front end of described purging air pipe 12 is exposed to flue gas partial and scribbles high-temperature wearable layer.
Parts of the present invention adopt stainless steel.
Operation principle of the present invention is:
Spray gun can be designed to corresponding size according to actual needs, and nozzle can also be adjusted thereupon, also can, in the situation that not changing nozzle outward appearance, change the performance parameters such as nozzle flow, operating pressure.
The nozzle assemblies such as liquid cap 4 and air cap 7 are embedded in purging air pipe 12, have avoided direct contact high temperature, high ash concentration, high flow rate flue gas.Extend the service life of nozzle assembly, guaranteed the long-term stability operation of nozzle.
The present invention adopts fixed nozzle body, and the structure of movable liquid cap 4, air cap 7, is convenient to change nozzle, as long as ensure that nozzle profile is consistent, the nozzle of replaceable different parameters, has strengthened widely applicable property of the present invention.
The present invention adopts all steel design, the use of stainless the first gasket seal 6 and the second gasket seal 9, ensured the present invention can be for a long time in high-temperature flue gas, stable use.
The present invention adopts straight barrel type design, and design length as required only need add cartridge support structure 15 in certain distance, guarantees distance between each pipe and the intensity of spray gun.
The foregoing is only example of the present invention, and unrestricted the present invention, the present invention can have various modifications and variations.All within the spirit and principle of this practical information, any amendment, the improvement etc. done, within all should being included in protection scope of the present invention.
Claims (3)
1. one kind is applicable to the air-cooled type air atomization spray gun of SNCR method denitration, comprise spray gun body and nozzle assembly, it is characterized in that: nozzle assembly is embedded in the purging air pipe (12) of spray gun body, spray gun body comprises aqueous suction pipes (1), one end of aqueous suction pipes (1) is provided with aqueous suction pipes joint (2), be connected by the female gas thread of aqueous suction pipes joint (2) and reducing agent, the other end is provided with lance head (3), the outer atomized air tube (11) that is provided with of aqueous suction pipes (1), atomized air tube (11) one end is connected by the female gas thread of atomizing air pipe joint (13) and atomizing air, the other end is connected with lance head (3), between atomized air tube (11) and spray gun body outer tube, be also provided with purging air pipe (12), one end of purging air pipe (12) is connected by the female gas thread of purging air pipe joint (14) and purging air, aqueous suction pipes (1), atomized air tube (11) is connected with the detachable connector (18) with anti-abrasive coatings by supporting construction (15), detachable connector (18) is connected by screw thread (16) with spray gun body, and be provided with the 3rd gasket seal (17),
Nozzle assembly comprises liquid cap (4), liquid cap (4) is connected with spray gun body male connection (5), and be provided with the first gasket seal (6), air cap (7) is connected by liquid cap male connection (8) with liquid cap (4), and being provided with the second gasket seal (9), air cap (7) is provided with air cap spout (10).
2. a kind of air-cooled type air atomization spray gun that is applicable to the denitration of SNCR method according to claim 1, is characterized in that: described supporting construction (15) adopts welding manner firm connection with aqueous suction pipes joint (2) and atomized air tube (11) with guarantee purging air pipe (12).
3. a kind of air-cooled type air atomization spray gun that is applicable to the denitration of SNCR method according to claim 1, is characterized in that: the front end of described purging air pipe (12) is exposed to flue gas partial and scribbles high-temperature wearable layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210167019.6A CN102688681B (en) | 2012-05-25 | 2012-05-25 | Air cooling type air atomization spray gun applicable to denitration by SNCR (selective non-catalytic reduction) method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210167019.6A CN102688681B (en) | 2012-05-25 | 2012-05-25 | Air cooling type air atomization spray gun applicable to denitration by SNCR (selective non-catalytic reduction) method |
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| CN102688681A CN102688681A (en) | 2012-09-26 |
| CN102688681B true CN102688681B (en) | 2014-06-11 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103406075B (en) * | 2013-05-22 | 2015-09-09 | 厦门钨业股份有限公司 | A kind of anti-blockage method of fluid bed overflow pipe and device thereof |
| CN103506234B (en) * | 2013-09-27 | 2016-03-16 | 中节能六合天融环保科技有限公司 | A kind of SNCR denitrating flue gas spray gun two-chamber hybrid double-layer spray technology |
| CN103990367B (en) * | 2014-05-23 | 2016-02-03 | 姜建勇 | The spray gun of modified desulphurization denitration |
| CN107983129A (en) * | 2017-11-27 | 2018-05-04 | 常州五王电机有限公司 | A kind of SNCR denitration high temperature resistant spray gun |
| CN109364712B (en) * | 2018-12-11 | 2024-05-28 | 中国华能集团清洁能源技术研究院有限公司 | Flue gas cooling type steam atomization spray gun suitable for SNCR (selective non-catalytic reduction) denitration |
| 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 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20050284957A1 (en) * | 2002-09-23 | 2005-12-29 | Spraying Systems Co. | External mix air atomizing spray nozzle assembly |
| CN201832731U (en) * | 2010-07-02 | 2011-05-18 | 黄晓军 | External mixing type double-fluid spray nozzle |
| CN102085452A (en) * | 2010-11-29 | 2011-06-08 | 中国环境科学研究院 | Reducing agent atomization spray gun for selective non-catalytic reduction denitration process |
| CN201880628U (en) * | 2010-12-20 | 2011-06-29 | 昆明理工大学 | Internal mixing type air atomizing nozzle |
| CN202606018U (en) * | 2012-05-25 | 2012-12-19 | 中国华能集团清洁能源技术研究院有限公司 | Air-cooling type air-atomizing spraying gun |
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Owner name: CHINA HUANENG GROUP R + D CENTER Effective date: 20131227 |
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Effective date of registration: 20131227 Address after: 100098 Beijing city Haidian District No. 48 Zhichun Road Yingdu building A block 26 layer Applicant after: China Huaneng Group Clean Energy Technology Research Institute Co., Ltd. Applicant after: Huaneng Group Technology Innovation Center Address before: 100098 Beijing city Haidian District No. 48 Zhichun Road Yingdu building A block 26 layer Applicant before: China Huaneng Group Clean Energy Technology Research Institute Co., Ltd. |
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