CN203577639U - Swirl mixing device for SCR (selective catalytic reduction) flue gas denitrification system - Google Patents
Swirl mixing device for SCR (selective catalytic reduction) flue gas denitrification system Download PDFInfo
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- CN203577639U CN203577639U CN201320818905.0U CN201320818905U CN203577639U CN 203577639 U CN203577639 U CN 203577639U CN 201320818905 U CN201320818905 U CN 201320818905U CN 203577639 U CN203577639 U CN 203577639U
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- flue
- ammonia
- spray ammonia
- mixing device
- pipeline
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Abstract
The utility model relates to a swirl mixing device for an SCR (selective catalytic reduction) flue gas denitrification system. The flue gas velocity uniformity of the existing boiler denitrification system can be ensured, but the denitrification efficiency is low since the uniformity of the NH3 concetration is low. Since the NH3 distribution is nonuniform, the NOx removal rate is low in dilute regions, and the ammonia escapement amount is large in thick regions. The swirl mixing device is composed of an ammonia spray pipeline (4), wherein the ammonia spray pipeline is arranged in an riser pipeline of an economizer exit flue (1); the ammonia spray pipeline is provided with a set of ammonia sprayers and connected with an ammonia spray flue (6); a swirl mixer set (5) is arranged in the ammonia spray flue; the ammonia spray flue is communicated with a catalyst-filled catalyst flue; the inlet of the catalyst flue is provided with a guide vane; and the upper part of the catalyst flue is provided with a flow straightening grid. The swirl mixing device is used for controlling emissions of oxynitrides in thermal power generation flue gas.
Description
Technical field:
The utility model relates to a kind of rotational flow mixing device for SCR flue gas denitrification system.
Background technology:
It is huge that the thermal power plant smoke discharge amount that coal is fuel be take in China, caused air quality severe exacerbation, wherein nitrogen oxide (NO
x) discharge particularly evident to the pollution of environment.Remove NO
xmethod have multiple, Selective Catalytic Reduction of NO wherein
xmethod (SCR), utilize ammonia (NH
3) make reducing agent, because its technology maturation is reliable, denitration efficiency is high, selectively good, cost performance is high, in newly-built and transformation power plant, the SCR technology that adopt make NO more
xbe reduced to the nitrogen (N of environmental sound
2) and water (H
2o), chemical equation is:
Adopt SCR technology, denitrification process occurs in catalyst area, affect denitration efficiency because have: the NO in flue gas
xand NH
3the uniformity of mixing and the uniformity of velocity of flue gas.The uniformity of existing Denitration in Boiler system velocity of flue gas can be guaranteed, and the key reason that denitration efficiency is low is NH
3the uniformity of concentration is low.Due to NH
3skewness, lighter region, NO
xremoval efficiency is low; Denseer region, amount of ammonia slip is large.NH after escape
3can with flue gas in SO
3reaction generates NH
4hSO
4, NH
4hSO
4can cause air preheater burn into dust stratification, crushing increases, and air-introduced machine, pressure fan are affected greatly, and has improved operating cost.
Utility model content:
The purpose of this utility model is to provide a kind of rotational flow mixing device for SCR flue gas denitrification system.
Above-mentioned object realizes by following technical scheme:
A kind of rotational flow mixing device for SCR flue gas denitrification system, its composition comprises: spray ammonia pipeline, described spray ammonia install pipeline is in the increase in pipeline of economizer exit flue, on described spray ammonia pipeline, one group of ammonia nozzle is installed, described spray ammonia pipeline is connected with spray ammonia flue, in described spray ammonia flue, cyclone mixer group is installed, described spray ammonia flue communicates with the catalyst flue that catalyst is housed, porch at described catalyst flue is provided with guide vane, on the top of described catalyst flue, flow straightening grid is installed.
The described rotational flow mixing device for SCR flue gas denitrification system, described spray ammonia pipeline comprise injection direction that make progress with downward ammonia nozzle, described cyclone mixer group comprises one group of cyclone, along boiler for deeply direction, be furnished with the described cyclone of 1 ~ 4 row, described cyclone mixer group is connected with the walling of flue of described economizer exit flue.
The described rotational flow mixing device for SCR flue gas denitrification system, described cyclone is by inner core, urceolus and swirl vane form, described inner core, described urceolus is coaxially set, described inner core hollow, described swirl vane is uniformly distributed circumferentially at described inner core, annular region between described urceolus, described swirl vane two ends are fixed in respectively described inner core, described urceolus, described swirl vane and described inner core axis inclination angle are 15 ° ~ 70 °, the swirl vane incline direction of the cyclone described in each is consistent, and inclination angle equates, the swirl vane of described cyclone is 3 ~ 15.
The described rotational flow mixing device for SCR flue gas denitrification system, in described economizer exit flue front portion, economizer exit ash bucket is installed, spray ammonia flue entrance ash bucket is installed at described economizer exit flue rear portion, and described economizer exit flue communicates with described spray ammonia flue.
Beneficial effect:
1. cyclone mixer group of the present utility model is arranged on spray ammonia pipeline top, the flue gas of process is produced to strong eddy flow phenomenon, utilize eddy flow to increase flue gas disturbance, improved the mixing efficiency of flue gas and ammonia, reduce the inhomogeneities of ammonia, be conducive to boiler and improve denitration efficiency, the escaping of ammonia rate is reduced, alleviate obstruction and the corrosion of the upstream device being caused by escape, improve the reliability of unit.
2. the utility model, not increasing ammonia injection rate and increasing under the condition of catalyst volume, has improved denitration efficiency and ammonia utilization rate, has reduced the escaping of ammonia rate, has alleviated the negative effect of ammonia to downstream heating surface and equipment.Concerning boiler design work, can suitably reduce spray ammonia flue height, improved the flexibility of design work; Concerning power plant, be conducive to power plant for energy conservation and reduce discharging, increase economic efficiency.Apparatus structure described in the utility model is simple, be easy to realize, easy for installation, have a good application prospect.
3. spray ammonia pipeline of the present utility model is with a plurality of ammonia nozzles, if the smoke content in flue is after economizer tobacco pipe and spray ammonia flue entrance ash bucket, meet the requirement that ammonia nozzle blocks and weares and teares, ammonia nozzle can be taked the pattern of Jet with downward flow direction ammonia, otherwise should take upwards to spray.The pattern of Jet with downward flow direction has increased the time that ammonia mixes with flue gas, can better reduce the inhomogeneities of ammonia, increases denitration efficiency.
Accompanying drawing explanation:
Accompanying drawing 1 is structural representation of the present utility model.In figure, 1 is economizer exit flue, and 2 is economizer exit ash bucket, and 3 is spray ammonia flue entrance ash bucket, 4 is spray ammonia pipeline, and 5 is cyclone mixer group, and 6 is spray ammonia flue, and 7 is guide vane, 8 is flow straightening grid, and 9 is catalyst flue, and 10 is catalyst, and 11 is catalyst flue outlet.
Accompanying drawing 2 is top views of accompanying drawing 1.
Accompanying drawing 3 is structural representations of cyclone of the present utility model.In figure, 12 is urceolus, and 13 is swirl vane, and 14 is inner core.
The specific embodiment:
Embodiment 1:
A kind of rotational flow mixing device for SCR flue gas denitrification system, its composition comprises: spray ammonia pipeline 4, described spray ammonia install pipeline is in the increase in pipeline of economizer exit flue 1, on described spray ammonia pipeline, one group of ammonia nozzle is installed, described spray ammonia pipeline is connected with spray ammonia flue 6, in described spray ammonia flue, cyclone mixer group 5 is installed, described spray ammonia flue communicates with catalyst flue 9, porch at described catalyst flue is provided with guide vane 7, top at described catalyst flue is provided with flow straightening grid 8, in described catalyst flue, be provided with caltalyst 10.
Embodiment 2:
According to the rotational flow mixing device for SCR flue gas denitrification system described in embodiment 1, described spray ammonia pipeline comprise injection direction that make progress with downward ammonia nozzle, described cyclone mixer group comprises one group of cyclone, along boiler for deeply direction, be furnished with the described cyclone of 1 ~ 4 row, described cyclone mixer group is connected with the walling of flue of described economizer exit flue.
Embodiment 3:
According to the rotational flow mixing device for SCR flue gas denitrification system described in embodiment 1 or 2, described cyclone is by inner core 14, urceolus 12 and swirl vane 13 form, described inner core, described urceolus is coaxially set, described inner core hollow, described swirl vane is uniformly distributed circumferentially at described inner core, annular region between described urceolus, described swirl vane two ends are fixed in respectively described inner core, described urceolus, described swirl vane and described inner core axis inclination angle are 15 ° ~ 70 °, the swirl vane incline direction of the cyclone described in each is consistent, and inclination angle equates, the swirl vane of described cyclone is 3 ~ 15, the swirl vane incline direction of two adjacent cyclones can be inconsistent.Through the flue gas of cyclone and the mist of ammonia, produce strong eddy flow mixed effect, if the swirl vane incline direction of two adjacent cyclones is consistent, the velocity attitude of adjacent swirling eddy on interface is contrary, immixture can be strengthened.Flow field through the mixed flue gas of eddy flow and ammonia mist is more mixed and disorderly, after guide vane, it is comparatively even that flow field becomes, and can reach the object of further mixing, pass through subsequently flow straightening grid rectification, make flue gas and ammonia mist meet the uniform requirement of speed.
Embodiment 4:
According to the rotational flow mixing device for SCR flue gas denitrification system described in embodiment 1 or 2 or 3, in described economizer exit flue front portion, economizer exit ash bucket 2 is installed, spray ammonia flue entrance ash bucket 3 is installed at described economizer exit flue rear portion, and described economizer exit flue communicates with described spray ammonia flue.
Embodiment 5:
The described rotational flow mixing device for SCR flue gas denitrification system, cyclone technique of the present utility model is widely used, from hydrodynamics, know, vortex gas-flow has proal axial velocity and along the tangential velocity of circular motion simultaneously, this just makes air-flow on flow direction, strengthen the disturbance ability of gas, the corresponding air-flow ability of mixing is also improved.Therefore, above spray ammonia pipeline, install cyclone mixer additional and replace original hybrid mode, NH
3mixture homogeneity improve, can increase Denitration in Boiler efficiency undoubtedly, make NH
3escape amount reduces, and reduces the negative effect to downstream heating surface and equipment, and the energy-saving and emission-reduction of power plant are produced to obvious facilitation.
Claims (4)
1. the rotational flow mixing device for SCR flue gas denitrification system, its composition comprises: spray ammonia pipeline, it is characterized in that: described spray ammonia install pipeline is in the increase in pipeline of economizer exit flue, on described spray ammonia pipeline, one group of ammonia nozzle is installed, described spray ammonia pipeline is connected with spray ammonia flue, in described spray ammonia flue, cyclone mixer group is installed, described spray ammonia flue communicates with the catalyst flue that catalyst is housed, porch at described catalyst flue is provided with guide vane, top at described catalyst flue is provided with flow straightening grid.
2. the rotational flow mixing device for SCR flue gas denitrification system according to claim 1, it is characterized in that: described spray ammonia pipeline comprise injection direction that make progress with downward ammonia nozzle, described cyclone mixer group comprises one group of cyclone, along boiler for deeply direction, be furnished with the described cyclone of 1 ~ 4 row, described cyclone mixer group is connected with the walling of flue of described economizer exit flue.
3. the rotational flow mixing device for SCR flue gas denitrification system according to claim 2, it is characterized in that: described cyclone is by inner core, urceolus and swirl vane form, described inner core, described urceolus is coaxially set, described inner core hollow, described swirl vane is uniformly distributed circumferentially at described inner core, annular region between described urceolus, described swirl vane two ends are fixed in respectively described inner core, described urceolus, described swirl vane and described inner core axis inclination angle are 15 ° ~ 70 °, the swirl vane incline direction of the cyclone described in each is consistent, and inclination angle equates, the swirl vane of described cyclone is 3 ~ 15.
4. according to the rotational flow mixing device for SCR flue gas denitrification system described in claim 1 or 2 or 3, it is characterized in that: in described economizer exit flue front portion, economizer exit ash bucket is installed, spray ammonia flue entrance ash bucket is installed at described economizer exit flue rear portion, and described economizer exit flue communicates with described spray ammonia flue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320818905.0U CN203577639U (en) | 2013-12-13 | 2013-12-13 | Swirl mixing device for SCR (selective catalytic reduction) flue gas denitrification system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320818905.0U CN203577639U (en) | 2013-12-13 | 2013-12-13 | Swirl mixing device for SCR (selective catalytic reduction) flue gas denitrification system |
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|---|---|
| CN203577639U true CN203577639U (en) | 2014-05-07 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103657411A (en) * | 2013-12-13 | 2014-03-26 | 哈尔滨锅炉厂有限责任公司 | Vortex mixing device for SCR (silicon controlled rectification) flue gas denitration system |
| CN105797583A (en) * | 2016-03-18 | 2016-07-27 | 东方电气集团东方锅炉股份有限公司 | Efficient denitration device with low ammonia escape |
| CN106139945A (en) * | 2016-06-27 | 2016-11-23 | 重庆赛宝工业技术研究院 | There is the flue gas mixing arrangement of low choked flow |
| CN107875847A (en) * | 2017-12-13 | 2018-04-06 | 山西大学 | A kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system |
| CN108939914A (en) * | 2018-09-12 | 2018-12-07 | 国网辽宁省电力有限公司电力科学研究院 | A kind of SCR denitrating flue gas classification rotational flow mixing device |
-
2013
- 2013-12-13 CN CN201320818905.0U patent/CN203577639U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103657411A (en) * | 2013-12-13 | 2014-03-26 | 哈尔滨锅炉厂有限责任公司 | Vortex mixing device for SCR (silicon controlled rectification) flue gas denitration system |
| CN103657411B (en) * | 2013-12-13 | 2016-10-05 | 哈尔滨锅炉厂有限责任公司 | Rotational flow mixing device for SCR flue gas denitrification system |
| CN105797583A (en) * | 2016-03-18 | 2016-07-27 | 东方电气集团东方锅炉股份有限公司 | Efficient denitration device with low ammonia escape |
| CN106139945A (en) * | 2016-06-27 | 2016-11-23 | 重庆赛宝工业技术研究院 | There is the flue gas mixing arrangement of low choked flow |
| CN107875847A (en) * | 2017-12-13 | 2018-04-06 | 山西大学 | A kind of ammonia nitrogen mixing arrangement for apparatus of thermo-electric power boiler spray ammonia system |
| CN107875847B (en) * | 2017-12-13 | 2023-12-29 | 山西大学 | Ammonia nitrogen mixing device for thermal power boiler ammonia spraying system |
| CN108939914A (en) * | 2018-09-12 | 2018-12-07 | 国网辽宁省电力有限公司电力科学研究院 | A kind of SCR denitrating flue gas classification rotational flow mixing device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140507 Termination date: 20161213 |