CN104258698A - SNCR (selective non-catalytic reduction) denitration reducing agent injection system - Google Patents
SNCR (selective non-catalytic reduction) denitration reducing agent injection system Download PDFInfo
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- CN104258698A CN104258698A CN201410520886.2A CN201410520886A CN104258698A CN 104258698 A CN104258698 A CN 104258698A CN 201410520886 A CN201410520886 A CN 201410520886A CN 104258698 A CN104258698 A CN 104258698A
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- agent injection
- denitration
- injection system
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- denitrfying agent
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Abstract
The invention discloses an SNCR (selective non-catalytic reduction) denitration reducing agent injection system, relating to a flue gas purification and denitration device. The system comprises a cyclone separator and a denitration agent injection device arranged in an inlet duct of the cyclone separator. The system is characterized in that a first surface and a second surface, which intersect with each other, are arranged on an inner side of the inlet duct of the cyclone separator in sequence along the direction from an inlet to the interior; the first surface forms an angle of 10-45 degrees relative to an outer side of the separator; the denitration agent injection device is arranged on the second surface; the height L from the denitration agent injection device to the lowest side from the inner side of the inlet duct of the cyclone separator is between 0.5 and 0.8 (the whole height H). The system can effectively reduce wear of the denitration agent injection device and especially obviously improve the denitration efficiency and simultaneously reduce the usage amount of a denitration agent.
Description
Technical field
The present invention relates to a kind of gas cleaning denitrification apparatus, particularly relate to SNCR denitration device, particularly coal-fired CFB-SNCR.
Background technology
The industrial production nitrogen oxide emission of the industries such as China's coal fired power generation, iron and steel, cement is huge, and oneself becomes the atmosphere pollution being only second to sulfur dioxide, and acid rain problem, air quality problems, atmosphere ozone layer destroying are more and more outstanding.Current China becomes large Acid Rain Zone, third place in the world after Europe and North America, thus causes serious environmental pressure to the sustainable development of China's economy.
SNCR is a kind of full-fledged NOx control technology.SNCR cardinal principle is not having under catalyst action, sprays denitrfying agent (being generally nitrogen agent) in 870 ~ 1150 DEG C of high-temperature flue gas, and in reducing agent and flue gas, NOx reacts and generates N
2.
The NOx emission of CFB stove own is low, and thermal power plant's NOx emission limit value will from 450-1100mg/Nm
3(by 2003 editions standards) are adjusted to 100-200mg/Nm
3.And key area (Beijing, Tianjin, Hebei, Shanghai, Zhejiang, Jiangsu, Guangdong, thermoelectricity installation accounts for the whole nation 29.6%) NOx emission limit value 100mg/Nm
3, because CFB stove is the high grey type of furnace, this is larger for enforcement SCR difficulty.Implementing SNCR technology will be the most economical means of CFB stove.
In existing SNCR, be furnished with various ways for denitration injection apparatus, routine is arranged in cyclone inlet flue, and this arrangement exists following subject matter:
1) because of entrance ash content and flow velocity higher, make spray gun very easily occur wear phenomenon.
2) utilization rate of the component in ash to denitrification reducing agent has the effect of reduction, and reduction dosage required under making identical denitration efficiency situation is larger.
3) the more important thing is, prior art carries out layout denitrfying agent injection apparatus at separator inlet, and thinking conveniently, the height of layout denitrfying agent injection apparatus in separator is lower, and (height L is the medial surface minimum limit height of denitrfying agent injection apparatus distance cyclone inlet flue, height H be on medial surface below between whole height), the denitrfying agent that denitrfying agent injection apparatus sprays mixes the time of staying of product in separator produced with flue gas longer, mix more abundant, the denitration effect that can produce is better.
Therefore, prior art is all tend to this layout height L to arrange as far as possible low.
Summary of the invention
The object of the invention is to: propose a kind of SNCR denitration reductant injection system, effectively can reduce the wearing and tearing of denitrfying agent injection apparatus, especially significantly improve denitration efficiency and but reduce denitrfying agent use amount simultaneously.
Object of the present invention is realized by following technical proposals:
A kind of SNCR denitration reductant injection system, comprise cyclone separator, and be arranged in the denitrfying agent injection apparatus of described cyclone inlet flue, the medial surface of described cyclone inlet flue has crossing first surface and second successively along entrance to interior direction, and the lateral surface of first surface relative separation device forms the angle of 10 ~ 45 °, described denitrfying agent injection apparatus is arranged in second, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is between 0.5 ~ 0.8 whole height H.
In such scheme, the present inventor finds, research recirculating fluidized bed being implemented to SNCR shows that the ash content in flue gas has certain inverse making to use to SNCR, simultaneously because the existence of entrance high flow rate and high ash quantity makes spray gun very easily occur abrasion condition, this programme is first by being arranged in inside separator by spray gun, outside is compared in inner side, and inherently ash concentration is lower slightly, the specific two-sided replicated structures of medial surface simultaneously, second region ash concentration is further obviously reduced, the possibility that effective minimizing ash concentration affects denitration reaction, thus, injection apparatus is arranged in second of low grey low regime, the utilization rate that improve reducing agent decreases the wearing and tearing of spray gun simultaneously.Wherein, described denitrfying agent injection apparatus is arranged in the second face and refers to denitrfying agent and spray from this face through injection apparatus.
The more important thing is, on the basis of aforementioned structure design, the present inventor finds further under study for action, after adopting this structure, be not as in the inertial thinking of prior art or prejudice always be familiar with " arrange that the height of denitrfying agent injection apparatus in separator is lower, the denitrfying agent that denitrfying agent injection apparatus sprays mixes the time of staying of product in separator produced with flue gas longer, mix more abundant, the denitration effect that can produce is better ", according to the result of the present inventor's lot of experiments, can it is evident that, by Burners Positions is optimized for after between 0.5H ~ 0.8H, denitration efficiency can reach about 80%, this takes other conventional meanses equally than in prior art, and only arrange the condition of injection apparatus at cyclone separator under, denitration efficiency wants high a lot, simultaneously than prior art under L arranges the identical denitration efficiency situation of injection apparatus lower than 0.5H, save reducing agent and reach more than 50%, visible this programme is on the basis that aforementioned structure is improved, the thinking that the further conventional lance arranging that the improvement of height is broken is arranged, achieve unexpected effect.
As selection, described L is between 0.6 ~ 0.8H.
As further selection, described L is between 0.65 ~ 0.8H.
As selection, the lateral surface of described first surface relative separation device forms the angle of 10 ~ 45 °.
As further selection, the lateral surface of described first surface relative separation device forms the angle of 25 ~ 45 °.
In such scheme, the present inventor finds under study for action, the angle that the lateral surface of first surface relative separation device is formed is larger, the low gray area of inertia produced is more obvious, so as selecting further, the lateral surface of described first surface relative separation device forms the angle of 20 ~ 45 °, the more preferably angle of 25 ~ 45 °.
As selection, the lateral surface of described second relative separation device forms the angle of 0 ~ 15 °.
As further selection, the lateral surface of described second relative separation device forms the angle of 0 ~ 5 °.
In such scheme, the special angle of second, is convenient to the low gray area of installation and maintenance and protection generation.
As selection, described cyclone separator is vertically arranged, described in described denitrfying agent injection apparatus injection direction horizontal vertical second.
The main scheme of aforementioned the present invention and each further selection scheme thereof can independent assortment to form multiple scheme; be the present invention can adopt and claimed scheme: as the present invention; each selection can select any combination with other; those skilled in the art can understand there is multiple combination according to prior art and common practise after understanding the present invention program; be the claimed technical scheme of the present invention, do not do exhaustive at this.
Beneficial effect of the present invention: the wearing and tearing effectively reducing denitrfying agent injection apparatus, especially significantly improves denitration efficiency and but reduces denitrfying agent use amount simultaneously.
Accompanying drawing explanation
Fig. 1 is the horizontal layout schematic diagram of the embodiment of the present invention;
Fig. 2 is the layout angle schematic diagram of Fig. 1;
Fig. 3 is the layout high-level schematic of Fig. 1;
In figure, 1 cyclone separator medial surface, 2 cyclone separator lateral surfaces, 3 cyclone inlet, 4 cyclone separators, 5 spray guns, 11 first surfaces, 12 second.
Detailed description of the invention
Below in conjunction with specific embodiments and the drawings, the present invention is further illustrated.
Embodiment 1:
Shown in figure 1-3, a kind of SNCR denitration reductant injection system, comprise cyclone separator 4, and be only arranged in the denitrfying agent injection apparatus of cyclone inlet flue, the medial surface 1 of cyclone inlet flue has crossing first surface 11 and the second face 12 successively along entrance 3 to interior direction, and the angle a that the lateral surface shape of first surface 11 relative separation device is at 45 °, the lateral surface of the second face 12 relative separation device forms the angle b of 0 °, denitrfying agent injection apparatus is arranged in the second face 12, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is 0.8H.As selection, cyclone separator 4 is vertically arranged, denitrfying agent injection apparatus injection direction horizontal vertical second face 12, as shown in the direction of arrow in figure.Its denitration efficiency is up to 83%, and the stoichiometric ratio of denitrfying agent is up to 1.5, and spray gun runs in 2 years and do not occur wearing and tearing simultaneously.
Embodiment 2:
The present embodiment is substantially the same manner as Example 1, and its difference is: the lateral surface of first surface relative separation device forms the angle of 25 °, and the lateral surface of second relative separation device forms the angle of 0 °.Its denitration efficiency is up to 80%, and the stoichiometric ratio of denitrfying agent is up to 1.56, and spray gun runs in 2 years and do not occur wearing and tearing simultaneously.
Embodiment 3:
The present embodiment is substantially the same manner as Example 1, and its difference is: denitrfying agent injection apparatus is arranged in the second face 12, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is 0.7H.Its denitration efficiency is up to 80%, and the stoichiometric ratio of denitrfying agent is up to 1.65, and spray gun runs in 2 years and do not occur wearing and tearing simultaneously.
Embodiment 4:
The present embodiment is substantially the same manner as Example 1, and its difference is: denitrfying agent injection apparatus is arranged in the second face 12, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is 0.6H.Its denitration efficiency is up to 81.5%, and the stoichiometric ratio of denitrfying agent is up to 1.7, and spray gun runs in 2 years and do not occur wearing and tearing simultaneously.
Embodiment 5:
The present embodiment is substantially the same manner as Example 1, and its difference is: denitrfying agent injection apparatus is arranged in the second face 12, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is 0.55H.Its denitration efficiency is up to 81.5%, and the stoichiometric ratio of denitrfying agent is up to 1.71, and spray gun runs in 1 year and do not occur wearing and tearing simultaneously.
Embodiment 6:
The present embodiment is substantially the same manner as Example 1, and its difference is: denitrfying agent injection apparatus is arranged in the second face 12, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is 0.5H.Its denitration efficiency is up to 80.5%, and the stoichiometric ratio of denitrfying agent is up to 1.72, and spray gun runs in 1 year and do not occur wearing and tearing simultaneously.
Embodiment 7:
The present embodiment is substantially the same manner as Example 1, its difference is: the lateral surface of first surface relative separation device forms the angle of 35 °, denitrfying agent injection apparatus is arranged in the second face 12, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is 0.65H.Its denitration efficiency is up to 82.7%, and the stoichiometric ratio of denitrfying agent is up to 1.65, and spray gun runs in 2 years and do not occur wearing and tearing simultaneously.
Embodiment 8:
The present embodiment is substantially the same manner as Example 8, and its difference is: denitrfying agent injection apparatus is arranged in the second face 12, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is 0.77H.Its denitration efficiency is up to 84.7%, and the stoichiometric ratio of denitrfying agent is up to 1.61, and spray gun runs in 2 years and do not occur wearing and tearing simultaneously.
Comparative example 1:
The present embodiment is substantially the same manner as Example 1, and its difference is: the lateral surface of first surface relative separation device forms the angle of 40 °, and the lateral surface of second relative separation device forms the angle of 0 °.Spray gun is arranged in outside separator, although its denitration efficiency is up to 80%, ammonia consumption is higher than embodiment 1 by 1/3, and spray gun comparatively significantly wore and tore with regard to existing in one month simultaneously.
Comparative example 2:
The present embodiment is substantially the same manner as Example 1, and its difference is: the lateral surface of first surface relative separation device forms the angle of 10 °, and the lateral surface of second relative separation device forms the angle of 0 °.Spray gun is arranged in first surface, and its denitration efficiency is the highest can only reach 75%, but ammonia consumption is higher than embodiment 1 by 1/4, and spray gun comparatively significantly wore and tore with regard to existing in two months simultaneously.
Comparative example 3:
The present embodiment is substantially the same manner as Example 1, its difference is: denitrfying agent injection apparatus is arranged in the second face 12, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is 0.2H, its denitration efficiency is the highest can only reach 35%, but ammonia consumption is higher than embodiment 11 times, spray gun comparatively significantly wore and tore with regard to existing in two months simultaneously.
Comparative example 4:
The present embodiment is substantially the same manner as Example 1, its difference is: denitrfying agent injection apparatus is arranged in the second face 12, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is 0.35H, its denitration efficiency is the highest can only reach 55%, but ammonia consumption is higher than embodiment 1 by 1/2.
Comparative example 5:
The present embodiment is substantially the same manner as Example 1, its difference is: denitrfying agent injection apparatus is arranged in the second face 12, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is 0.45H, its denitration efficiency is the highest can only reach 65%, but ammonia consumption is higher than embodiment 1 by 1/3.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a SNCR denitration reductant injection system, comprise cyclone separator, and be arranged in the denitrfying agent injection apparatus of described cyclone inlet flue, it is characterized in that: the medial surface of described cyclone inlet flue has crossing first surface and second successively along entrance to interior direction, and the lateral surface of first surface relative separation device forms the angle of 10 ~ 45 °, described denitrfying agent injection apparatus is arranged in second, and the height L on the minimum limit of medial surface of distance cyclone inlet flue is between 0.5 ~ 0.8 whole height H.
2. SNCR denitration reductant injection system as claimed in claim 1, is characterized in that: described L is between 0.6 ~ 0.8H.
3. SNCR denitration reductant injection system as claimed in claim 2, is characterized in that: described L is between 0.65 ~ 0.8H.
4. SNCR denitration reductant injection system as claimed in claim 1, is characterized in that: the lateral surface of described first surface relative separation device forms the angle of 20 ~ 45 °.
5. SNCR denitration reductant injection system as claimed in claim 4, is characterized in that: the lateral surface of described first surface relative separation device forms the angle of 25 ~ 45 °.
6. SNCR denitration reductant injection system as claimed in claim 1, is characterized in that: the lateral surface of described second relative separation device forms the angle of 0 ~ 15 °.
7. SNCR denitration reductant injection system as claimed in claim 6, is characterized in that: the lateral surface of described second relative separation device forms the angle of 0 ~ 5 °.
8. SNCR denitration reductant injection system as claimed in claim 1, is characterized in that: described cyclone separator is vertically arranged, described in described denitrfying agent injection apparatus injection direction horizontal vertical second.
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| CN201410520886.2A CN104258698B (en) | 2014-09-30 | 2014-09-30 | SNCR denitration reductant injection system |
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| CN201410520886.2A CN104258698B (en) | 2014-09-30 | 2014-09-30 | SNCR denitration reductant injection system |
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| CN104258698B CN104258698B (en) | 2017-06-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106287681A (en) * | 2016-01-18 | 2017-01-04 | 无锡华光锅炉股份有限公司 | A kind of separator inlet flue duct structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974204A (en) * | 2012-12-13 | 2013-03-20 | 江苏百灵天地环境设计研究院有限公司 | Reaction device for SNCR (selective non-catalytic reduction) denitration system of circulating fluid bed |
| CN203764106U (en) * | 2014-01-26 | 2014-08-13 | 浙江天蓝环保技术股份有限公司 | Flue gas denitrification device implemented by combining SNCR (selective non-catalytic reduction)-ozone oxidation with wet absorption |
| CN204121957U (en) * | 2014-09-30 | 2015-01-28 | 东方电气集团东方锅炉股份有限公司 | SNCR denitration reductant injection system |
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- 2014-09-30 CN CN201410520886.2A patent/CN104258698B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102974204A (en) * | 2012-12-13 | 2013-03-20 | 江苏百灵天地环境设计研究院有限公司 | Reaction device for SNCR (selective non-catalytic reduction) denitration system of circulating fluid bed |
| CN203764106U (en) * | 2014-01-26 | 2014-08-13 | 浙江天蓝环保技术股份有限公司 | Flue gas denitrification device implemented by combining SNCR (selective non-catalytic reduction)-ozone oxidation with wet absorption |
| CN204121957U (en) * | 2014-09-30 | 2015-01-28 | 东方电气集团东方锅炉股份有限公司 | SNCR denitration reductant injection system |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106287681A (en) * | 2016-01-18 | 2017-01-04 | 无锡华光锅炉股份有限公司 | A kind of separator inlet flue duct structure |
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