CN204768271U - Boiler SCR denitrification facility of economizer and air preheater doublestage staggered arrangement - Google Patents
Boiler SCR denitrification facility of economizer and air preheater doublestage staggered arrangement Download PDFInfo
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- CN204768271U CN204768271U CN201520399374.5U CN201520399374U CN204768271U CN 204768271 U CN204768271 U CN 204768271U CN 201520399374 U CN201520399374 U CN 201520399374U CN 204768271 U CN204768271 U CN 204768271U
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Abstract
The utility model discloses a boiler SCR denitrification facility of economizer and air preheater doublestage staggered arrangement, according to flue gas flow direction including setting gradually the high -temperature economizer in the flue, the high temperature air preheater, the eddy -mixing ware, ammonia injection grid, denitration reactor, low -level (stack -gas) economizer and low temperature air preheater, the flue includes first vertical flue, vertical flue of second and the vertical flue of third, the bottom and the vertical flue of the second intercommunication of first vertical flue, the top and the vertical flue top of the third intercommunication of the vertical flue of second, high -temperature economizer and high temperature air preheater set up in first vertical flue, eddy -mixing ware and ammonia injection grid set up in the vertical flue of second, denitration reactor, low -level (stack -gas) economizer and low temperature air preheater all set up in the vertical flue of third. The utility model has the advantages that: change arrangement form in the past, arrange each part respectively in the vertical flue of difference, reserve sufficient position, transformation convenience, compact structure, denitration efficiency height for denitration reactor.
Description
Technical field
The utility model relates to the boiler SCR denitration device of a kind of economizer and air preheater twin-stage interlaced arrangement.
Background technology
In numerous denitration technologies, selective catalytic reduction (SCR) is that denitration efficiency is the highest, denitration technology the most ripe.Its technological principle is under catalyst action, sprays into ammonia, NOx is reduced into N in the flue gas of temperature about 300 DEG C ~ 410 DEG C
2and H
20.
Because SCR denitration technique has specific requirement to reaction temperature window, therefore usual flue SCR denitration device be arranged between boiler economizer and air preheater, in this location arrangements, the optimum temperature that flue-gas temperature is in SCR reaction is usually interval.
For the boiler of economizer and air preheater twin-stage interlaced arrangement, if adopt conventional remodeling method, existing modular heating surface must be split, to obtain suitable temperature window, meet the requirement of SCR denitration reaction to flue-gas temperature.But even if temperature window is positioned at the space for maintenance between adjacent heating surface just, these spaces also may not have enough highly for extraction and the introducing of denitration flue.
Utility model content
The purpose of this utility model is the boiler SCR denitration device providing a kind of economizer and air preheater twin-stage interlaced arrangement, and the boiler that effectively can solve existing economizer and air preheater twin-stage interlaced arrangement adopts conventional method transformation not have enough height to draw the problem introduced for denitration flue.
In order to solve the problems of the technologies described above, the utility model is achieved through the following technical solutions: the boiler SCR denitration device of a kind of economizer and air preheater twin-stage interlaced arrangement, the high-temperature economizer be successively set in flue is comprised by flow of flue gas direction, high temperature air preheater, vortex mixer, ammonia-spraying grid, Benitration reactor, low-level (stack-gas) economizer and low temperature air preheater, described flue comprises the first vertical flue, second vertical flue and the 3rd vertical flue, the bottom of the described first vertical flue is communicated with the second vertical flue, the top of the second vertical flue is communicated with the 3rd vertical flue top, described high-temperature economizer and high temperature air preheater are arranged in the first vertical flue, described vortex mixer and ammonia-spraying grid are arranged in the second vertical flue, described Benitration reactor, low-level (stack-gas) economizer and low temperature air preheater are all arranged in the 3rd vertical flue.
Preferably, described ammonia-spraying grid connects ammonia-air mixer, and described ammonia-air mixer is also connected with dilution air; The appropriate ammonia of supply is convenient to follow-up denitration reaction.
Preferably, three layers of cellular catalyst layer are provided with in described Benitration reactor; Ensure denitration efficiency.
Preferably, in the described 3rd vertical flue, the cross-sectional area of low-level (stack-gas) economizer place flue is less than the cross-sectional area of Benitration reactor place flue; Temperature before making outlet temperature and transforming is consistent.
Compared with prior art, the utility model has the advantages that: change arrangement in the past, high-temperature economizer, high temperature air preheater, vortex mixer, ammonia-spraying grid, Benitration reactor, low-level (stack-gas) economizer and low temperature air preheater are arranged in different vertical flues, enough positions are reserved to Benitration reactor, transformation is convenient, compact conformation, denitration efficiency is high.
Accompanying drawing explanation
Fig. 1 is the structural representation of the boiler SCR denitration device of a kind of economizer of the utility model and air preheater twin-stage interlaced arrangement.
Detailed description of the invention
Consult the embodiment that Fig. 1 is the boiler SCR denitration device of a kind of economizer of the utility model and air preheater twin-stage interlaced arrangement, the high-temperature economizer 1 be successively set in flue is comprised by flow of flue gas direction, high temperature air preheater 2, vortex mixer 3, ammonia-spraying grid 4, Benitration reactor 5, low-level (stack-gas) economizer 9 and low temperature air preheater 10, described flue comprises the first vertical flue 11, second vertical flue 12 and the 3rd vertical flue 13, the bottom of the described first vertical flue 11 is communicated with the second vertical flue 12, the top of the second vertical flue 12 is communicated with the 3rd vertical flue 13 top, described high-temperature economizer 1 and high temperature air preheater 2 are arranged in the first vertical flue, described vortex mixer 3 and ammonia-spraying grid 4 are arranged in the second vertical flue 12, described Benitration reactor 5, low-level (stack-gas) economizer 9 and low temperature air preheater 10 are all arranged in the 3rd vertical flue, in described 3rd vertical flue 13, the cross-sectional area of low-level (stack-gas) economizer 9 place flue is less than the cross-sectional area of Benitration reactor 5 place flue, described ammonia-spraying grid 4 connects ammonia-air mixer 7, described ammonia-air mixer 7 is also connected with dilution air 8, three layers of cellular catalyst layer 6 are provided with in described Benitration reactor 5.
SCR denitration transformation is carried out for certain power plant 280t/h boiler.Before transformation, the heat exchange structure of this boiler is followed successively by high-temperature economizer 1, high temperature air preheater 2, low-level (stack-gas) economizer 9, low temperature air preheater 10 from top to bottom, and the flue-gas temperature between high temperature air preheater and low-level (stack-gas) economizer is 450 DEG C, and the method being transformed into said structure is as follows:
(1) low-level (stack-gas) economizer 9 is shifted out, vacating space as SCR denitration device introducing flue and draw flue;
(2) increase the heating surface area of high temperature air preheater 2, make the flue-gas temperature between high temperature air preheater 2 and low-level (stack-gas) economizer 9 maintain between 320 ~ 400 DEG C, be i.e. the required flue-gas temperature of SCR denitration reaction.
(3) in one end of Benitration reactor 5 and the first vertical flue, the lower side pipe of high temperature air preheater 2 connects, three layers of cellular catalyst layer 6 are had in Benitration reactor 5, second vertical flue inside is provided with vortex mixer 3 and ammonia-spraying grid 4, ammonia-spraying grid 4 connects with the outlet of ammonia/air mixer 7, another entrance of ammonia/air mixer 7 is connected to ammonia, and delivers ammonia by the dilution wind that dilution air 8 produces.
(4) low-level (stack-gas) economizer 9 shifted out is arranged at the other end of Benitration reactor 5, then the other end of this low-level (stack-gas) economizer 9 is connect by the extraction flue of SCR denitration device and low temperature air preheater 10 pipe.
(5) reduce the heating surface area of low-level (stack-gas) economizer 9, the temperature before outlet temperature and SCR are transformed is consistent.
This device changes arrangement in the past, high-temperature economizer, high temperature air preheater, vortex mixer, ammonia-spraying grid, Benitration reactor, low-level (stack-gas) economizer and low temperature air preheater are arranged in different vertical flues, enough positions are reserved to Benitration reactor, transformation is convenient, compact conformation, denitration efficiency is high.
The foregoing is only specific embodiment of the utility model, but technical characteristic of the present utility model is not limited thereto, any those skilled in the art is in field of the present utility model, and the change done or modification are all encompassed among the scope of the claims of the present utility model.
Claims (4)
1. the boiler SCR denitration device of an economizer and air preheater twin-stage interlaced arrangement, it is characterized in that: comprise the high-temperature economizer (1) be successively set in flue by flow of flue gas direction, high temperature air preheater (2), vortex mixer (3), ammonia-spraying grid (4), Benitration reactor (5), low-level (stack-gas) economizer (9) and low temperature air preheater (10), described flue comprises the first vertical flue (11), second vertical flue (12) and the 3rd vertical flue (13), the bottom of the described first vertical flue (11) is communicated with the second vertical flue (12), the top of the second vertical flue (12) is communicated with the 3rd vertical flue (13) top, described high-temperature economizer (1) and high temperature air preheater (2) are arranged in the first vertical flue, described vortex mixer (3) and ammonia-spraying grid (4) are arranged in the second vertical flue (12), described Benitration reactor (5), low-level (stack-gas) economizer (9) and low temperature air preheater (10) are all arranged in the 3rd vertical flue.
2. the boiler SCR denitration device of a kind of economizer as claimed in claim 1 and air preheater twin-stage interlaced arrangement, it is characterized in that: described ammonia-spraying grid (4) connects ammonia-air mixer (7), and described ammonia-air mixer (7) is also connected with dilution air (8).
3. the boiler SCR denitration device of a kind of economizer as claimed in claim 1 and air preheater twin-stage interlaced arrangement, is characterized in that: be provided with three layers of cellular catalyst layer (6) in described Benitration reactor (5).
4. the boiler SCR denitration device of a kind of economizer as claimed in claim 1 and air preheater twin-stage interlaced arrangement, is characterized in that: the cross-sectional area of the described 3rd vertical flue (13) interior low-level (stack-gas) economizer (9) place flue is less than the cross-sectional area of Benitration reactor (5) place flue.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105363347A (en) * | 2015-12-15 | 2016-03-02 | 浙江百能科技有限公司 | SCR denitration reaction device of coupling coal economizers |
| CN106439874A (en) * | 2016-12-14 | 2017-02-22 | 浙江特富锅炉有限公司 | Boiler flue |
| CN106556022A (en) * | 2016-11-02 | 2017-04-05 | 苏州西热节能环保技术有限公司 | A kind of high temperature cigarette cooler steam air heater system suitable for SCR denitration system |
| CN106975356A (en) * | 2016-01-18 | 2017-07-25 | 同方环境股份有限公司 | It is a kind of to be applied to double economizer, the SCR denitration systems of air preheater interlaced arrangement |
| CN107152673A (en) * | 2017-06-06 | 2017-09-12 | 大唐贵州发耳发电有限公司 | A kind of device for improving coal-fired electric generation furnace denitration inlet flue gas temperature |
| CN111151131A (en) * | 2020-02-28 | 2020-05-15 | 中国华能集团清洁能源技术研究院有限公司 | Normal-temperature SCR denitration device and process for improving denitration efficiency of boiler |
| CN112546861A (en) * | 2019-09-26 | 2021-03-26 | 华北理工大学 | Combined denitration system and method for preheating section and tail flue of steel rolling heating furnace |
-
2015
- 2015-06-10 CN CN201520399374.5U patent/CN204768271U/en active Active
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105363347A (en) * | 2015-12-15 | 2016-03-02 | 浙江百能科技有限公司 | SCR denitration reaction device of coupling coal economizers |
| CN106975356A (en) * | 2016-01-18 | 2017-07-25 | 同方环境股份有限公司 | It is a kind of to be applied to double economizer, the SCR denitration systems of air preheater interlaced arrangement |
| CN106556022A (en) * | 2016-11-02 | 2017-04-05 | 苏州西热节能环保技术有限公司 | A kind of high temperature cigarette cooler steam air heater system suitable for SCR denitration system |
| CN106556022B (en) * | 2016-11-02 | 2019-05-03 | 苏州西热节能环保技术有限公司 | A kind of high temperature cigarette cooler-steam air heater system suitable for SCR denitration system |
| CN106439874A (en) * | 2016-12-14 | 2017-02-22 | 浙江特富锅炉有限公司 | Boiler flue |
| CN107152673A (en) * | 2017-06-06 | 2017-09-12 | 大唐贵州发耳发电有限公司 | A kind of device for improving coal-fired electric generation furnace denitration inlet flue gas temperature |
| CN112546861A (en) * | 2019-09-26 | 2021-03-26 | 华北理工大学 | Combined denitration system and method for preheating section and tail flue of steel rolling heating furnace |
| CN111151131A (en) * | 2020-02-28 | 2020-05-15 | 中国华能集团清洁能源技术研究院有限公司 | Normal-temperature SCR denitration device and process for improving denitration efficiency of boiler |
| CN111151131B (en) * | 2020-02-28 | 2024-01-30 | 中国华能集团清洁能源技术研究院有限公司 | Normal-temperature SCR denitration device and technology for improving denitration efficiency of boiler |
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