CN103028507A - Reducing agent atomizer for SNCR (selective non-catalytic reduction) denitration - Google Patents
Reducing agent atomizer for SNCR (selective non-catalytic reduction) denitration Download PDFInfo
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- CN103028507A CN103028507A CN 201210560297 CN201210560297A CN103028507A CN 103028507 A CN103028507 A CN 103028507A CN 201210560297 CN201210560297 CN 201210560297 CN 201210560297 A CN201210560297 A CN 201210560297A CN 103028507 A CN103028507 A CN 103028507A
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Abstract
The invention provides a reducing agent atomizer for SNCR denitration, which consists of a liquid tube, an air tube, an air-liquid mixing tube, a conical tube, a spray tube, a nozzle, a distributor and a liquid tube-closing plate. The distributor is arranged between the air-liquid mixing tube and the conical tube, the air-liquid mixing tube, the conical tube, the spray tube and the distributor are welded together, the air tube is arranged on the side of the air-liquid mixing tube, one end of the liquid tube is extended into the air-liquid mixing tube, the periphery of the tail of the liquid tube is provided with jet holes, and the liquid tube-closing plate is arranged on the end of the liquid tube, and is provided with a jet hole. The structure of the reducing agent atomizer is simple, the fabrication cost is low, and the reducing agent atomizer is convenient to mount and dismount; the atomizing effect is good, drips cannot be produced, the denitration efficiency is high, and the operating cost is reduced.
Description
Technical field
The present invention relates to coal-fired flue gas denitration, particularly a kind of reducing agent atomizing lance for the SNCR denitrating technique.
Background technology
Along with the develop rapidly of China's economy and industry, atmosphere pollution sulfur dioxide and nitrogen oxide emission also increase sharply.In recent years, some metropolitan air nitrous oxides concentrations of China exceed standard, and the environmental carrying capacity of nitrogen oxide is in saturation state substantially, some local even generation photochemical fog phenomenons.At present, owing to be subjected to the restriction of the aspects such as operational management and expense, SNCR (Selective Non-Catalytic Reduction, SNCR) gas denitrifying technology is mainly selected in China's middle and small burn coal boiler and middle-size and small-size cement kiln flue gas denitration.The SNCR denitration technology is that the reducing agent (such as ammoniacal liquor or urea etc.) that contains the NHx base is sprayed into temperature in the burner hearth is 800-1100 ℃ zone, and the rapid thermal decomposition of this reducing agent becomes NH
3With other accessory substance, subsequently NH
3Carry out the SNCR reaction and generate N with the nitrogen oxide (NOx) in the flue gas
2
The key equipment of SNCR system is the reducing agent atomizing lance, by the reducing agent atomizing lance with spray into after the reductant solution atomizing in the burner hearth with flue gas in nitrogen oxide (NOx) carry out the SNCR reaction.
Because the environment temperature of work reaches as high as 1300 ℃, and is higher to the requirement of spray gun, the spray gun that present domestic SNCR system adopts is mainly take external import spray gun as main.This type of spray gun price is higher, and its atomization structure is only at the spray gun end mixed aerosol nozzle to be set, and gas-liquid is mixed aerosol endways, and gas-liquid contact time is short, and it is inhomogeneous to atomize, and produces easily drop; Simultaneously since the atomizer of spray gun at high temperature for a long time, easily loss needs often to change, the spray gun atomizer and the rifle body that use at present are whole, change nozzle and change exactly whole spray gun, operating cost is higher.
Summary of the invention
For the defective of reducing agent atomizing lance in the prior art, the object of the present invention is to provide a kind of reducing agent atomizing lance for the SNCR denitration, this spray gun structure is simple, cheap, atomizer is easily changed; Atomizing effect is good, does not have water droplet to produce.
The present invention is that the technical scheme that its technical problem of solution adopts is: comprise liquid line, flue, gas-liquid mixed pipe, conical pipe, injection spray pipe, nozzle, distributor, liquid line shrouding.Be provided with distributor between gas-liquid mixed pipe and the conical pipe, gas-liquid mixed pipe and conical pipe, injection spray pipe, distributor are weldingly connected, gas-liquid mixed pipe side is provided with flue, one end of liquid line stretches in the gas-liquid mixed pipe, its afterbody circumferentially has spray-hole, the end is provided with the liquid line shrouding, has spray-hole on the shrouding.
Described injection spray pipe external diameter is 20 ~ 40mm, and tail end arranges external screw thread.
The circumferential spray-hole quantity of described liquid line tail end is 25 ~ 40, diameter 1.2 ~ 6mm.
Spray-hole quantity is 4 ~ 6 on the described liquid line shrouding, and diameter is 1.2 ~ 5mm.
Described nozzle is the internal thread bellmouth, and the jet internal diameter is 2mm, and nozzle is threaded connection on injection spray pipe.
Evenly be provided with 18 ~ 25 filter openings on the described distributor, diameter 2 ~ 6mm.
During work, liquid line is connected with the container that fills reductant solution, injects reductant solution in liquid line; Flue is connected with vapour source or compressed air source, injects atomization gas in the gas-liquid mixed pipe.When some spray-holes that reductant solution circumferentially has by the liquid line afterbody and the some spray-holes on the shrouding of end are ejected to the gas-liquid mixed pipe, tentatively be fractured into fine liquid particles or vaporific, again with after the atomization gas that injects at first contacts, in the gas-liquid mixed pipe, rub first, mix, further reducing agent is broken into more tiny drop or is mixed near vaporific gas, then enter secondary friction behind conical pipe and the playpipe, mixing by the filter opening on the distributor, current stabilization goes out by nozzle ejection.
Beneficial effect of the present invention is: the reducing agent atomizing lance is simple in structure, cost is low, it is very convenient to install, dismantle; Atomizing effect is good, does not have water droplet to produce, and denitration efficiency is high, has reduced operating cost; This reducing agent atomizing lance nozzle end can enter in the boiler and caliber little, can not transform water-cooling wall during installation; Adopt compressed air as the atomizing source of the gas.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of distributor.
Fig. 3 is the structural representation of shrouding.
Among the figure, 1 is liquid line, and 2 is flue, and 3 is the gas-liquid mixed pipe, and 4 is conical pipe, and 5 is injection spray pipe, and 6 is nozzle, and 7 is distributor, and 8 is the liquid line shrouding.
The specific embodiment
The present invention will be further described below in conjunction with the drawings and specific embodiments.
This specific embodiment comprises: liquid line 1, flue 2, gas-liquid mixed pipe 3, conical pipe 4, injection spray pipe 5, nozzle 6, distributor 7, liquid line shrouding 8.Be provided with distributor 7 between gas-liquid mixed pipe 3 and the conical pipe 4, gas-liquid mixed pipe 3 and conical pipe 4, injection spray pipe 5, distributor 7 are weldingly connected, gas-liquid mixed pipe 3 sides are provided with flue 2, one end of liquid line 1 stretches in the gas-liquid mixed pipe 3, the afterbody of liquid line 1 circumferentially has spray-hole, the end is provided with liquid line shrouding 8, has spray-hole on the shrouding 8.
Described injection spray pipe external diameter is 25mm, and tail end arranges external screw thread.
The circumferential spray-hole quantity of described liquid line tail end is 30, diameter 4mm.
Spray-hole quantity is 4 on the described liquid line shrouding, and diameter is 3mm.
Described nozzle is the internal thread bellmouth, and the jet internal diameter is 2mm, and nozzle is threaded connection on injection spray pipe.
Evenly be provided with 21 filter openings on the described distributor, diameter 4mm.
During work, liquid line 1 is connected with the container that fills reductant solution, injects reductant solution in liquid line 1; Flue 2 is connected with vapour source or compressed air source, injects atomization gas in gas-liquid mixed pipe 3.When some spray-holes that reductant solution circumferentially has by liquid line 1 afterbody and the some spray-holes on the end shrouding 8 are ejected to gas-liquid mixed pipe 3, tentatively be fractured into fine liquid particles or vaporific, contact with the atomization gas that injects at first again, in gas-liquid mixed pipe 3, rub first, mix, further reducing agent is broken into more tiny drop or is mixed near vaporific gas, then enter conical pipe 4 and playpipe 5 rear secondary frictions, mixing by the filter opening on the distributor 7, current stabilization ejects by nozzle 6.
Claims (5)
1. a reducing agent atomizing lance that is used for the SNCR denitration comprises liquid line, flue, injection spray pipe, nozzle, it is characterized in that: also comprise gas-liquid mixed pipe, conical pipe, distributor, liquid line shrouding; Be provided with distributor between gas-liquid mixed pipe and the conical pipe, gas-liquid mixed pipe and conical pipe, injection spray pipe, distributor are weldingly connected, and gas-liquid mixed pipe side is provided with flue, and an end of liquid line stretches in the gas-liquid mixed pipe.
2. described a kind of reducing agent atomizing lance for the SNCR denitration according to claim 1, it is characterized in that: described injection spray pipe tail end arranges external screw thread, and nozzle is the internal thread bellmouth, and nozzle is threaded connection on injection spray pipe.
3. described a kind of reducing agent atomizing lance for the SNCR denitration according to claim 1 is characterized in that: evenly be provided with 18 ~ 25 filter openings on the described distributor, diameter 2 ~ 6mm.
4. according to claim 1 to 3 described any reducing agent atomizing lances for the SNCR denitration, it is characterized in that: the circumferential spray-hole quantity of described liquid line tail end is 25 ~ 40, diameter 1.2 ~ 6mm.
5. according to claim 1 to 3 described any reducing agent atomizing lances for the SNCR denitration, it is characterized in that: spray-hole quantity is 4 ~ 6 on the described liquid line shrouding, and diameter is 1.2 ~ 5mm.
Priority Applications (1)
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CN 201210560297 CN103028507A (en) | 2012-12-21 | 2012-12-21 | Reducing agent atomizer for SNCR (selective non-catalytic reduction) denitration |
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CN 201210560297 CN103028507A (en) | 2012-12-21 | 2012-12-21 | Reducing agent atomizer for SNCR (selective non-catalytic reduction) denitration |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104001635A (en) * | 2014-05-23 | 2014-08-27 | 浙江莱梦德电力设备有限公司 | Novel spray gun for desulfurization and denitrification |
CN104399615A (en) * | 2014-10-31 | 2015-03-11 | 中国神华能源股份有限公司 | Atomization injection device |
CN107158912A (en) * | 2017-05-09 | 2017-09-15 | 东莞市大能环保科技有限公司 | A kind of high-temperature steam is atomized denitrification apparatus |
CN107469608A (en) * | 2017-09-11 | 2017-12-15 | 苏州中材建设有限公司 | Reducing agent sprayer unit for denitrating flue gas |
CN109395563A (en) * | 2018-12-12 | 2019-03-01 | 中国华能集团清洁能源技术研究院有限公司 | A kind of efficient liquid atomization jetting device and method |
-
2012
- 2012-12-21 CN CN 201210560297 patent/CN103028507A/en active Pending
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN104001635A (en) * | 2014-05-23 | 2014-08-27 | 浙江莱梦德电力设备有限公司 | Novel spray gun for desulfurization and denitrification |
CN104399615A (en) * | 2014-10-31 | 2015-03-11 | 中国神华能源股份有限公司 | Atomization injection device |
CN107158912A (en) * | 2017-05-09 | 2017-09-15 | 东莞市大能环保科技有限公司 | A kind of high-temperature steam is atomized denitrification apparatus |
CN107469608A (en) * | 2017-09-11 | 2017-12-15 | 苏州中材建设有限公司 | Reducing agent sprayer unit for denitrating flue gas |
CN109395563A (en) * | 2018-12-12 | 2019-03-01 | 中国华能集团清洁能源技术研究院有限公司 | A kind of efficient liquid atomization jetting device and method |
CN109395563B (en) * | 2018-12-12 | 2023-08-29 | 中国华能集团清洁能源技术研究院有限公司 | Efficient liquid atomization spraying device and method |
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Application publication date: 20130410 |