CN201748452U - Nitrogen oxides reducing system based on combination of selective non-catalytic reduction system and combustion system - Google Patents
Nitrogen oxides reducing system based on combination of selective non-catalytic reduction system and combustion system Download PDFInfo
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- CN201748452U CN201748452U CN2010202364584U CN201020236458U CN201748452U CN 201748452 U CN201748452 U CN 201748452U CN 2010202364584 U CN2010202364584 U CN 2010202364584U CN 201020236458 U CN201020236458 U CN 201020236458U CN 201748452 U CN201748452 U CN 201748452U
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- nitrogen oxide
- catalytic reduction
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- reducing agent
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Abstract
The utility model provides a nitrogen oxides lowering system based on the combination of a selective non-catalytic reduction system and a combustion system, which belongs to the field of combustion equipment and can solve the problem that the conventional nitrogen oxides lowering system based on the combination of a selective non-catalytic reduction system and a combustion system has a bad effect on the lowering of nitrogen oxides content in flue gas. The nitrogen oxides lowering system comprises a furnace body, fuel spouts and an OFA Over Fire Air spout, wherein the fuel spouts and the OFA spout are arranged on the side wall of the furnace body; and a liquid reducing agent sprayer is arranged at the OFA spout and used for atomizing liquid reducing agent into liquid drops that can be sprayed with the over fire air into a furnace chamber. The nitrogen oxides lowering system of the utility model can be used as a boiler, a melting furnace, a combustion furnace and the like.
Description
Technical field
The utility model relates to the reduction nitrogen oxide system that a kind of selective non-catalytic reduction system and combustion system combine, and relates in particular to the reduction nitrogen oxide system that large-scale selective non-catalytic reduction system and combustion system combine.
Background technology
In large-scale combustion systems such as existing boiler, smelting furnace, incinerator, used combustion wind system (OFA more, Overfire Air) reduces the discharging of pollutant, be about to fuel and (can be coal dust, oil, natural gas etc.) and secondary wind (refer to be used to carry fuel and enter the furnace body air-supply, can be air, oxygen etc.) spray into the combustion zone of burner hearth together and make it burning, and above the combustion zone, sprayed into combustion wind (can be air, oxygen etc.) to form the completing combustion district, thereby realize the maximization of burning, reduce the generation of pollutant.Even cross the combustion wind system but used, still can contain a certain amount of nitrogen oxide (NO in the burner hearth flue gas that burning generates
X, be mainly NO and NO
2), and nitrogen oxide can cause pollutions such as acid rain, photochemical fog.In order further to reduce the content of nitrogen oxide in the discharged flue gas, can use SNCR (SNCR, Selective Non-CatalyticReduction) method, soon can optionally be reduced to nitrogen oxide the reducing agent injection burner hearth flue gas of nitrogen, thereby reduce the amount of nitrogen oxides in the burner hearth flue gas, wherein reducing agent can spray into by the spout that is located at the furnace arch, furnace nose below.
The inventor finds that there are the following problems at least in the prior art: the reduction nitrogen oxide system that existing selective non-catalytic reduction system and combustion system combine can not effectively be discharged into liquid reducing agent in the burner hearth flue gas, so it reduces the weak effect of amount of nitrogen oxides.
The utility model content
The reduction nitrogen oxide system that embodiment of the present utility model provides a kind of selective non-catalytic reduction system and combustion system to combine, it reduces the effective of amount of nitrogen oxides.
For achieving the above object, embodiment of the present utility model adopts following technical scheme:
The reduction nitrogen oxide system that a kind of selective non-catalytic reduction system and combustion system combine comprises:
Furnace body, there is burner hearth inside, and described roof of the furnace connects flue;
Fuel nozzle ports is located on the sidewall of described furnace body, is used for fuel and secondary wind are sprayed into described burner hearth;
After-flame wind system spout is located on the sidewall of described furnace body, and the position is higher than the position of described fuel nozzle ports, is used for after-flame wind is sprayed into described burner hearth;
The liquid reducing agent sprayer is located at described after-flame wind system spout place, is used to make liquid reducing agent formation drop and sprays into described burner hearth with described after-flame wind.
In the reduction nitrogen oxide system that selective non-catalytic reduction system and the combustion system of the utility model embodiment combines, liquid reducing agent adds by the after-flame wind snout, can effectively be discharged in the burner hearth flue gas, so it reduces the effective of amount of nitrogen oxides.
Description of drawings
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, accompanying drawing in describing below only is embodiment more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the selective non-catalytic reduction system of the utility model embodiment and the sectional structure chart of the reduction nitrogen oxide system that combustion system combines;
Fig. 2 is the schematic diagram of the after-flame wind system nozzle exit area of the selective non-catalytic reduction system of the utility model embodiment and the reduction nitrogen oxide system that combustion system combines;
Fig. 3 is the selective non-catalytic reduction system of the utility model embodiment and reduction nitrogen oxide system that combustion system the combines reducing agent accumulative total burst size simulation drawing at differing heights.
The specific embodiment
Below in conjunction with the accompanying drawing among the utility model embodiment, the technical scheme of the utility model embodiment is clearly and completely described, obviously, described embodiment only is a part of embodiment of the present utility model, rather than whole embodiment.Based on the embodiment in the utility model, all other embodiment that those of ordinary skills are obtained under the prerequisite of not making creative work belong to the scope that the utility model is protected.
The reduction nitrogen oxide system that the utility model embodiment provides a kind of selective non-catalytic reduction system and combustion system to combine comprises:
Furnace body, there is burner hearth inside, and described roof of the furnace connects flue;
Fuel nozzle ports is located on the sidewall of described furnace body, is used for fuel and secondary wind are sprayed into described burner hearth;
After-flame wind system spout is located on the sidewall of described furnace body, and the position is higher than the position of described fuel nozzle ports, is used for after-flame wind is sprayed into described burner hearth;
The liquid reducing agent sprayer is located at described after-flame wind system spout place, is used to make liquid reducing agent formation drop and sprays into described burner hearth with described after-flame wind.
In the reduction nitrogen oxide system that selective non-catalytic reduction system and the combustion system of the utility model embodiment combines, liquid reducing agent adds by the after-flame wind snout, can effectively be discharged in the burner hearth flue gas, so it reduces the effective of amount of nitrogen oxides.
Embodiment one
The reduction nitrogen oxide system that the utility model embodiment provides a kind of selective non-catalytic reduction system and combustion system to combine, the reduction nitrogen oxide system that this selective non-catalytic reduction system and combustion system combine can be used as boiler, smelting furnace, incinerator etc.
As shown in Figure 1, the reduction nitrogen oxide system that the selective non-catalytic reduction system of present embodiment and combustion system combine comprises that is a cubical furnace body 1 on the whole, have in the furnace body 1 and be cubical burner hearth 2 on the whole, burner hearth 2 bottoms are the shape of falling the truncated rectangular pyramids, and the top connects flue 3, can be provided with heat exchanger 4 parts such as grade in the flue 3; In close flue 3 porch, a face (back wall) of burner hearth 2 is provided with the furnace arch, furnace nose (folding flame nose) 5 of projection.
On the sidewall (as water-cooling wall) of furnace body 1, be provided with a plurality of fuel nozzle ports 6, these fuel nozzle ports 6 are used for secondary wind and fuel are sprayed into the combustion zone 7 of burner hearth.On furnace body 1 sidewall, also be provided with separate type after-flame wind system (SOFA, refer to that secondary wind and after-flame wind separate the system of air feed) spout 8, be used for after-flame wind is sprayed into the completing combustion district 9 of burner hearth 2, this separate type after-flame wind system spout 8 position on furnace body 1 is than the position height of fuel nozzle ports 6.
Also be provided with the sprayer (mechanical atomizer) 10 that connects liquid reducing agent pipe (liquid reducing agent provides system) 11 at separate type after-flame wind system spout 8 places, be used for and spray into burner hearth from the liquid reducing agent atomizing of the optionally nitrogen oxides reduction of liquid reducing agent pipe 11 and with after-flame wind.Wherein, mechanical atomizer 10 can make liquid reducing agent enter burner hearth 2 by different modes, as entering burner hearth 2 with after-flame wind again with spraying in the after-flame wind after the liquid reducing agent atomizing, or also can directly use after-flame wind that the liquid reducing agent atomizing is also sprayed into burner hearth 2 together, the structure of this mechanical atomizer 10 (as jet size etc.) can guarantee that it is atomized into liquid reducing agent the drop of 100～1000 microns of average diameters, and liquid reducing agent can be ammoniacal liquor, aqueous solution of urea, amine compound aqueous solution etc., it is preferably the urea of concentration 5～10%, and is preferably entering 0.3～0.6 second internal reaction in burner hearth 2 backs.This separate type after-flame wind system spout 8 can be a plurality of, and can be on the sustained height on furnace body 1, and above-mentioned mechanical atomizer 10 can be contained on whole separate type after-flame wind system spouts 8, also can only be contained on the separate type after-flame wind system spout 8 of part.In a plurality of separate type after-flame wind system spout 8 residing cross sections, each spout 8 can distribute by mode as shown in Figure 2, on each sidewall, respectively there are two, two spouts 8 on the same sidewall are the same end of close sidewall all, spout 8 corresponding distributions on each sidewall, the spout 8 on promptly arbitrary sidewall is all away from the spout on its adjacent wall.
Most of reducing agents all discharge in the annular region around flame in the present embodiment, owing to there is not the drop of precipitation on the water-cooling wall, no tangible reducing agent discharges on water-cooling wall.Because the reducing agent release ratio adds evenly, so help the reduction of nitrogen oxide.
Fig. 3 is the reducing agent accumulative total burst size at differing heights place in the selective non-catalytic reduction system of the present embodiment that obtains by computational fluid dynamics simulation and the reduction nitrogen oxide system that combustion system combines.As seen, less in the release of adjacent separate type after-flame wind system spout 8 places (promptly abscissa is 25000 millimeters places among the figure) reducing agent, and a large amount of reducing agents discharges in the higher position of absolute altitude, so more helps the reduction of nitrogen oxide.
The above; it only is the specific embodiment of the present utility model; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of described claim.
Claims (10)
1. the reduction nitrogen oxide system that combines of selective non-catalytic reduction system and combustion system comprises:
Furnace body, there is burner hearth inside, and described roof of the furnace connects flue;
Fuel nozzle ports is located on the sidewall of described furnace body, is used for fuel and secondary wind are sprayed into described burner hearth;
After-flame wind system spout is located on the sidewall of described furnace body, and the position is higher than the position of described fuel nozzle ports, is used for after-flame wind is sprayed into described burner hearth;
It is characterized in that the reduction nitrogen oxide system that described selective non-catalytic reduction system and combustion system combine also comprises:
The liquid reducing agent sprayer is located at described after-flame wind system spout place, is used to make liquid reducing agent formation drop and sprays into described burner hearth with described after-flame wind.
2. the reduction nitrogen oxide system that selective non-catalytic reduction system according to claim 1 and combustion system combine is characterized in that, described after-flame wind system spout is a separate type after-flame wind system spout.
3. the reduction nitrogen oxide system that selective non-catalytic reduction system according to claim 2 and combustion system combine is characterized in that described liquid reducing agent sprayer is a mechanical atomizer.
4. the reduction nitrogen oxide system that selective non-catalytic reduction system according to claim 3 and combustion system combine, it is characterized in that the structure of described mechanical atomizer can guarantee that the drop of its formation is the drop of 100 microns～1000 microns of average diameters.
5. the reduction nitrogen oxide system that selective non-catalytic reduction system according to claim 1 and combustion system combine, it is characterized in that, described after-flame wind system spout is a plurality of, and described liquid reducing agent sprayer is located at least one described after-flame wind system spout place.
6. the reduction nitrogen oxide system that selective non-catalytic reduction system according to claim 5 and combustion system combine, it is characterized in that, described furnace body is a cube structure, and two described after-flame wind system spouts are respectively arranged on four sidewalls of described furnace body.
7. the reduction nitrogen oxide system that selective non-catalytic reduction system according to claim 6 and combustion system combine, it is characterized in that, any one sidewall of described furnace body all has first side and second side, and the first side of any one described sidewall and the second side of adjacent wall join; And on any one sidewall, the distance between the first side of any one after-flame wind system spout and described sidewall is less than the distance between the second side of itself and described sidewall.
8. the reduction nitrogen oxide system that selective non-catalytic reduction system according to claim 1 and combustion system combine, it is characterized in that, the reduction nitrogen oxide system that described selective non-catalytic reduction system and combustion system combine comprises that also liquid reducing agent provides system, described liquid reducing agent provides system to connect described liquid reducing agent sprayer, is used for providing liquid reducing agent to described liquid reducing agent sprayer.
9. the reduction nitrogen oxide system that selective non-catalytic reduction system according to claim 1 and combustion system combine is characterized in that the sidewall of described furnace body is a water-cooling wall.
10. the reduction nitrogen oxide system that combines according to any described selective non-catalytic reduction system and combustion system in the claim 1 to 9, it is characterized in that the reduction nitrogen oxide system that described selective non-catalytic reduction system and combustion system combine is any one in boiler, smelting furnace, the incinerator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202364584U CN201748452U (en) | 2010-06-17 | 2010-06-17 | Nitrogen oxides reducing system based on combination of selective non-catalytic reduction system and combustion system |
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| CN2010202364584U CN201748452U (en) | 2010-06-17 | 2010-06-17 | Nitrogen oxides reducing system based on combination of selective non-catalytic reduction system and combustion system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103041686A (en) * | 2012-12-28 | 2013-04-17 | 浙江天洁环境科技股份有限公司 | NOx removing device and method by means of exhaust gas recycle and ammonia agent spray |
| CN105920997A (en) * | 2016-06-12 | 2016-09-07 | 华中科技大学 | Coal-fired boiler denitration system and method with over fire air and SNCR coupled |
| CN107213771A (en) * | 2017-07-14 | 2017-09-29 | 光大环境科技（中国）有限公司 | The biomass direct-fired device that flue gas recirculation and SNCR are combined |
-
2010
- 2010-06-17 CN CN2010202364584U patent/CN201748452U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103041686A (en) * | 2012-12-28 | 2013-04-17 | 浙江天洁环境科技股份有限公司 | NOx removing device and method by means of exhaust gas recycle and ammonia agent spray |
| CN105920997A (en) * | 2016-06-12 | 2016-09-07 | 华中科技大学 | Coal-fired boiler denitration system and method with over fire air and SNCR coupled |
| CN105920997B (en) * | 2016-06-12 | 2018-09-25 | 华中科技大学 | A kind of coal-burning boiler denitrating system that burnout degree is coupled with SNCR and method |
| CN107213771A (en) * | 2017-07-14 | 2017-09-29 | 光大环境科技（中国）有限公司 | The biomass direct-fired device that flue gas recirculation and SNCR are combined |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: AMINA ENERGY ENVIRONMENTAL TECHNOLOGY (CHINA) CO., Free format text: FORMER NAME: AMINA POWER ENVIRONMENTAL TECHNOLOGY DEVELOPMENT BEIJING CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 100016 Beijing city Chaoyang District No. 26 Xiaoyun Road, Eagle building, room A-2507 Patentee after: Amie energy environmental protection technology (China) Co., Ltd. Address before: 100016 Beijing city Chaoyang District No. 26 Xiaoyun Road, Eagle building, room A-2507 Patentee before: LP Amina Energy and Environmental Company |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110216 Termination date: 20170617 |
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| CF01 | Termination of patent right due to non-payment of annual fee |