CN203771435U - Low-resistance straight-flow type pre-dedusting and denitration combined system device - Google Patents
Low-resistance straight-flow type pre-dedusting and denitration combined system device Download PDFInfo
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- CN203771435U CN203771435U CN201420122035.8U CN201420122035U CN203771435U CN 203771435 U CN203771435 U CN 203771435U CN 201420122035 U CN201420122035 U CN 201420122035U CN 203771435 U CN203771435 U CN 203771435U
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Abstract
The utility model relates to a low-resistance straight-flow type pre-dedusting and denitration combined system device. The low-resistance straight-flow type pre-dedusting and denitration combined system device comprises a boiler flue, a pre-dedusting device, an SCR reactor, an air pre-heater and a rear dedusting device which are sequentially communicated. The pre-dedusting device is a straight-flow type pre-dedusting device and comprises a casing, an air inlet header pipe, an air outlet header pipe, one or more straight-flow cyclones and an ash collecting and discharging mechanism. Each straight-flow cyclone comprises an inlet structure for enabling air to perform rotating motion and an outlet structure for separating dust and purifying the air, wherein the outlet structure comprises an air purifying discharging pipe and an annular space ash discharging pipe, the air purifying discharging pipe is communicated with the annular space ash discharging pipe, the annular space ash discharging pipe is communicated with the ash collecting and discharging mechanism. The low-resistance straight-flow type pre-dedusting and denitration combined system device adopts the straight-flow type pre-dedusting device, is low in resistance and small in air flow flowing influence and air flow disturbance, does not need additional flow equalizers and other rectifying device and ensures the ammonia spraying uniformity. The influence of smoke flow fluctuation on the dedusting efficiency is very small, smoke flows range from 50%-150%, and the dedusting efficiency fluctuation is lower than 5%.
Description
Technical field
the utility model relates to the pre-dedusting of a kind of low-resistance single flow and denitration combined system equipment.
Background technology
the high dirt arrangement of the many employings of existing SCR flue-gas denitration process, be that SCR reactor is arranged between boiler economizer and air preheater, the flue gas of drawing from boiler economizer enters air preheater after SCR reactor, the most common arrangement in Ta Shi power plant.But high dirt arranges that dust content is higher, SO
x
concentration is higher.Therefore, traditional high dirt arranges that SCR flue-gas denitration process exists following problem: 1,, due to high dirt arrangement, do not pass through dedusting, so the dust content in flue gas is high, easily blocking catalyst, if just stop up must blowing out for catalyst, lose huge, increase operating cost; 2, dust concentration is higher, the NH that denitration reaction leaks
3
with SO
3
and H
2
o can generate the materials such as ammonium hydrogen sulfate (ABS), and this material has larger stickiness, can make dust at air preheater surface aggregation, cause contamination and the corrosion of air preheater, cause the obstruction of air preheater, improve the cleaning frequency of air preheater, increase operating cost; 3, the probability stopping up in order to reduce catalyst, generally need to select large aperture catalyst, thereby can cause catalyst volume larger, has increased SCR project investment cost; 4, in dust, contain the material that calcium oxide, alkali metal etc. are harmful to catalyst, easily cause catalyst abrasion and poisoning, shorten catalyst service life, increase operating cost, reduce stability and the reliability of device.Therefore, need to before SCR denitration, first carry out and dedusting carrying out.
preposition pre-dedusting comprises the general benefit of SCR denitration: 1, protection denitrating catalyst, prevents the problems such as the obstruction of catalyst, poisoning, wearing and tearing, the service life of extending catalyst; 2, due to the low dirt environment after pre-dedusting, catalyst can be selected the more specification of small-bore, improves unit specific area, reduces the volume of catalyst; 3, due to the low dirt environment after pre-dedusting, the probability that the air preheater of postorder stops up significantly declines, and the cleaning frequency significantly extends; 4, due to the low dirt environment after pre-dedusting, the spray ammonia nozzle of SCR device is difficult for stopping up, so setting party is to flexibly, sprays ammonia effective; 5, due to the low dirt environment after pre-dedusting, catalyst and follow-up equipment can not established deashing device and maybe cleaning cycle significantly can be extended, and have reduced deashing energy consumption; 6, reduce the load of follow-up high-effective dust-removing equipment (as sack cleaner, electrostatic precipitator, electric-bag complex dust collector etc.), improve its running parameter (as improved the rate of filtration of bag-type dusting, reduce the electric field quantity of electric precipitation etc.), reduce equipment manufacturing cost, save place; 7, the low cloud of dust air lift height denitrating system reliability of operation, can cancel denitration bypass, reduce equipment manufacturing cost.
Summary of the invention
the purpose of this utility model is to provide the pre-dedusting of a kind of low-resistance single flow and denitration combined system equipment.
for achieving the above object, the technical solution adopted in the utility model is:
a kind of pre-dedusting of low-resistance single flow and denitration combined system equipment, comprise the boiler flue being communicated with successively, pre-dedusting device, SCR reactor, air preheater and rear dust arrester, described pre-dedusting device is single flow pre-dedusting device, it comprises housing, be arranged on air intake house steward and air-out house steward on described housing, be arranged on one or more D. C. cyclone of described enclosure interior and the collection ash exhauster being connected with described housing, described D. C. cyclone attached bag is drawn together with described air intake house steward and is connected for the entrance structure that γ-ray emission is rotatablely moved, for separating of the export structure of dust and pure qi (oxygen), described export structure comprises the pure qi (oxygen) discharge pipe that is arranged on described D. C. cyclone middle part, between the inwall of described D. C. cyclone and described pure qi (oxygen) discharge pipe outer wall, form for discharging the annular space ash releasing tube of dust, described pure qi (oxygen) discharge pipe is connected with described air-out house steward, described annular space ash releasing tube is connected with described collection ash exhauster.
preferably, described collection ash exhauster is connected with final dusting device, and the pure qi (oxygen) outlet of described final dusting device is connected with the pure qi (oxygen) discharge pipe of described pre-dedusting device.
further preferably, described final dusting device is gravitational precipitator, cyclone dust collectors, multicyclone, house-bag duster for high temperature, electrostatic precipitator, gravel bed filter.
preferably, the guide vane that described entrance structure comprises hub, is fixedly installed around described hub, the described guide vane relatively axis direction of described deduster body is obliquely installed.
preferably, described pre-dedusting device also comprises the integrated board for fixing described D. C. cyclone.
preferably, multiple described D. C. cyclone are set up in parallel, the collection ash exhauster described in shared.
because technique scheme is used, the utility model compared with prior art has following advantages:
the utility model adopts single flow pre-dedusting device to be applied in SCR denitrating technique it:
(1) resistance is low: 50-100Pa, and reverse-flow type deduster is about 600-2000Pa;
(2) because resistance is low, little on air current flow impact, the disturbance of air-flow is little, without the extra rectifying installations such as current equalizer that increase, ensures spray ammonia uniformity;
(3) flue gas flow fluctuation is very little on efficiency of dust collection impact, flue gas flow 50%-150%, and efficiency of dust collection fluctuates in 5%.
Brief description of the drawings
accompanying drawing 1 is structural representation of the present utility model;
accompanying drawing 2 is the structural representation of pre-dedusting device in the utility model;
the structural representation that accompanying drawing 3 is only established a D. C. cyclone period of the day from 11 p.m. to 1 a.m for pre-dedusting device in the utility model is as figure;
the structural representation that accompanying drawing 4 is established multiple D. C. cyclone period of the day from 11 p.m. to 1 a.m for pre-dedusting device in the utility model is as figure.
wherein: 1, boiler flue; 2, pre-dedusting device; 20, housing; 21, hub; 22, guide vane; 23, pure qi (oxygen) discharge pipe; 24, annular space ash releasing tube; 25, ash bucket; 26, final dusting device; 27, air intake house steward; 28, air-out house steward; 29, D. C. cyclone; 3, SCR reactor; 4, air preheater; 5, rear dust arrester; 6, desulfurizing tower; 7, blower fan; 8, chimney.
Detailed description of the invention
below in conjunction with drawings and Examples, the utility model is further described:
the pre-dedusting of a kind of low-resistance single flow as shown in Figure 1 and denitration combined system equipment, comprise the boiler flue 1, pre-dedusting device 2, SCR reactor 3, air preheater 4 and the rear dust arrester 5 that are communicated with successively, in addition, after in the present embodiment, dust arrester 5 is also connected with desulfurizing tower 6, is connected with atmosphere thereby desulfurizing tower 6 is connected to chimney 8 by blower fan 7.
as shown in Figure 2: in the present embodiment: pre-dedusting device 2 is single flow pre-dedusting device, it comprises housing 20, is arranged on air intake house steward 27 and the air-out house steward 28 on housing 20, D. C. cyclone 29 that is arranged on housing 20 inside and the collection ash exhauster being connected with housing 20.D. C. cyclone 29 comprises and being connected with air intake house steward 27 for entrance structure that γ-ray emission is rotatablely moved, for separating of the export structure of dust and pure qi (oxygen).Entrance structure, export structure are separately positioned on the two ends of D. C. cyclone 29, are fixed in housing 20 by integrated board.
in general: D. C. cyclone 29 is cylindric, and diameter is smaller, and efficiency of dust collection is higher, but as too little in diameter, has the danger of being stopped up by dust; About length, in short D. C. cyclone 29, the dust separating time may be inadequate equally, and long D. C. cyclone 29 can loss bring disaster upon the energy revolving and the disorders that increase air-flow, so that reduce efficiency of dust collection, therefore needs suitably to adjust according to actual needs.
entrance structure can be also diversified, in the present embodiment: the guide vane 22 that entrance structure comprises hub 21, is fixedly installed around hub 21, the axis direction of guide vane 22 relative D. C. cyclone 29 is obliquely installed, guide vane 22 is optimal is to become 45 degree with axis, dusty gas also produces and rotatablely moves in guide vane 22 enters deduster body 20, and dust is separated from gas.
export structure comprise between the inwall of the pure qi (oxygen) discharge pipe 23, D. C. cyclone 29 that are arranged on D. C. cyclone 29 middle parts and pure qi (oxygen) discharge pipe 23 outer walls, form for discharging the annular space ash releasing tube 24 of dust, pure qi (oxygen) discharge pipe 23 is connected with air-out house steward 28, and annular space ash releasing tube 24 is connected with collection ash exhauster.In D. C. cyclone 29 interior dusts, in gas, under turning effort, separate to surrounding, pure qi (oxygen) is discharged from middle pure qi (oxygen) discharge pipe 23, and the dust of separating enters in collection ash exhauster from the annular space ash releasing tube 24 of pure qi (oxygen) discharge pipe 23 surroundings.
ash discharge structure is mainly ash bucket 25, and in general: the dust of separating from gas must be collected, a kind of method is there is no secondary gas flow, and from D. C. cyclone 29, dust out enters ash bucket 25, under Action of Gravity Field directly through row sedimentation.The second is to siphon away a part of gas from each D. C. cyclone 29, and cinder dirt falls under gravity into ash bucket 25, and thinner dust enters final dusting device 26 in company with the gas of extracting out and carries out dedusting again.The third is whole dusts to be sucked to final dusting device 26 together in company with gas carry out dedusting again.In the present embodiment, select the second ash method, and final dusting device 26 can be chosen as gravitational precipitator, cyclone dust collectors, multicyclone, house-bag duster for high temperature, electrostatic precipitator, gravel bed filter etc., final dusting device 26 is communicated with the pure qi (oxygen) discharge pipe 23 of pre-dedusting device 2 by blower fan 7, enters next step processing.
in addition, the quantity of D. C. cyclone 29 can only arrange one as required, as shown in Figure 3, also can be set side by side with multiplely, and multiple D. C. cyclones 29 shares an ash discharge structure, as shown in Figure 4.
above-described embodiment is only explanation technical conceive of the present utility model and feature, and its object is to allow person skilled in the art can understand content of the present utility model and implement according to this, can not limit protection domain of the present utility model with this.All equivalences of doing according to the utility model Spirit Essence change or modify, within all should being encompassed in protection domain of the present utility model.
Claims (6)
1. the pre-dedusting of low-resistance single flow and denitration combined system equipment, comprise the boiler flue being communicated with successively, pre-dedusting device, SCR reactor, air preheater and rear dust arrester, it is characterized in that: described pre-dedusting device is single flow pre-dedusting device, it comprises housing, be arranged on air intake house steward and air-out house steward on described housing, be arranged on one or more D. C. cyclone of described enclosure interior and the collection ash exhauster being connected with described housing, described D. C. cyclone attached bag is drawn together with described air intake house steward and is connected for the entrance structure that γ-ray emission is rotatablely moved, for separating of the export structure of dust and pure qi (oxygen), described export structure comprises the pure qi (oxygen) discharge pipe that is arranged on described D. C. cyclone middle part, between the inwall of described D. C. cyclone and described pure qi (oxygen) discharge pipe outer wall, form for discharging the annular space ash releasing tube of dust, described pure qi (oxygen) discharge pipe is connected with described air-out house steward, described annular space ash releasing tube is connected with described collection ash exhauster.
2. the pre-dedusting of low-resistance single flow according to claim 1 and denitration combined system equipment, it is characterized in that: described collection ash exhauster is connected with final dusting device, the pure qi (oxygen) outlet of described final dusting device is connected with the pure qi (oxygen) discharge pipe of described pre-dedusting device.
3. the pre-dedusting of low-resistance single flow according to claim 2 and denitration combined system equipment, is characterized in that: described final dusting device is gravitational precipitator, multicyclone, house-bag duster for high temperature, electrostatic precipitator, gravel bed filter.
4. the pre-dedusting of low-resistance single flow according to claim 1 and denitration combined system equipment, it is characterized in that: the guide vane that described entrance structure comprises hub, is fixedly installed around described hub, the described guide vane relatively axis direction of described deduster body is obliquely installed.
5. the pre-dedusting of low-resistance single flow according to claim 1 and denitration combined system equipment, is characterized in that: described pre-dedusting device also comprises the integrated board for fixing described D. C. cyclone.
6. the pre-dedusting of low-resistance single flow according to claim 1 and denitration combined system equipment, is characterized in that: multiple described D. C. cyclone are set up in parallel, the collection ash exhauster described in shared.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122035.8U CN203771435U (en) | 2014-03-18 | 2014-03-18 | Low-resistance straight-flow type pre-dedusting and denitration combined system device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420122035.8U CN203771435U (en) | 2014-03-18 | 2014-03-18 | Low-resistance straight-flow type pre-dedusting and denitration combined system device |
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| CN203771435U true CN203771435U (en) | 2014-08-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106390744A (en) * | 2016-11-10 | 2017-02-15 | 广东电网有限责任公司电力科学研究院 | SCR (selective catalytic reduction) denitrification system and operating method thereof |
| CN106621584A (en) * | 2017-02-28 | 2017-05-10 | 东方电气集团东方锅炉股份有限公司 | Centrifugal type pre-dedusting device for SCR (selective catalytic reduction) denitration |
| CN107744709A (en) * | 2017-07-15 | 2018-03-02 | 广西海禾环保科技有限公司 | The energy-efficient solidifying formula electric-bag complex dust collector of vortex flow spray |
| CN109701323A (en) * | 2019-01-16 | 2019-05-03 | 南京航空航天大学 | Axial flow combined dust removal system and method for high temperature and high dust-containing flue gas |
-
2014
- 2014-03-18 CN CN201420122035.8U patent/CN203771435U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106390744A (en) * | 2016-11-10 | 2017-02-15 | 广东电网有限责任公司电力科学研究院 | SCR (selective catalytic reduction) denitrification system and operating method thereof |
| CN106621584A (en) * | 2017-02-28 | 2017-05-10 | 东方电气集团东方锅炉股份有限公司 | Centrifugal type pre-dedusting device for SCR (selective catalytic reduction) denitration |
| CN107744709A (en) * | 2017-07-15 | 2018-03-02 | 广西海禾环保科技有限公司 | The energy-efficient solidifying formula electric-bag complex dust collector of vortex flow spray |
| CN107744709B (en) * | 2017-07-15 | 2023-01-24 | 广西海禾环保科技有限公司 | High-efficiency energy-saving vortex flow spraying type electric bag composite dust remover |
| CN109701323A (en) * | 2019-01-16 | 2019-05-03 | 南京航空航天大学 | Axial flow combined dust removal system and method for high temperature and high dust-containing flue gas |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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Effective date of registration: 20160729 Address after: Split eight communities in Wujiang District of Suzhou City, Jiangsu province 215000 Patentee after: KELIN ENVIRONMENTAL PROTECTION TECHNOLOGY CO.,LTD. Address before: Song Ling Zhen Wujiang District of Suzhou City, Jiangsu province 215222 split eight community traffic road No. 8 Patentee before: Kelin Environmental Protection Equipment, Inc. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20140813 |
|
| CX01 | Expiry of patent term |