CN203316011U - Structure for improving coal-fired boiler tail smoke denitration input rate - Google Patents
Structure for improving coal-fired boiler tail smoke denitration input rate Download PDFInfo
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- CN203316011U CN203316011U CN2013204215272U CN201320421527U CN203316011U CN 203316011 U CN203316011 U CN 203316011U CN 2013204215272 U CN2013204215272 U CN 2013204215272U CN 201320421527 U CN201320421527 U CN 201320421527U CN 203316011 U CN203316011 U CN 203316011U
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Abstract
The utility model discloses a structure for improving the coal-fired boiler tail smoke denitration input rate. The structure comprises an SCR reactor and an SCR upstream heat exchanger. A branch flue is formed between a first inlet flue of the SCR reactor and a second inlet flue of the SCR upstream heat exchanger. An adjustment stop plate is arranged on the branch flue. According to the structure, smoke on the high-temperature portions is led into the inlet of the SCR reactor, the temperature inside the SCR reactor can effectively rise, the temperature of the smoke at the inlet of the SCR reactor can be effectively guaranteed to be within the optimal reduction temperature range, and therefore the denitration input rate is improved. The structure for improving the coal-fired boiler tail smoke denitration input rate is simple in structure, low in manufacturing cost and capable of being popularized in multiple coal fired power stations.
Description
Technical field
The relevant energy-saving and emission-reduction of the utility model field, particularly a kind of structure that there is important function to improving coal-fired unit SCR denitrogenation devoting rate.
Background technology
China's energy resource structure be take coal as main, and in Technology of Electrical Power Generation, coal-fired unit occupies main share.At present, China's coal burning machine kludge has approached 80%, surpasses nearly 40 percentage points of world average level.In the coal resources upstream, because Coal Quality can not get paying attention to, downstream often occurs that coal quality changes greatly, causes boiler coke, undercapacity, even pollutant emission exceeds standard.Especially aspect pollutant emission, under the appearance of a series of policies and regulations of country (especially " fossil-fuel power plant atmospheric pollutant emission standard 2011 "), electricity power enterprise continues to increase under pressure, even the environmental protection equipment design is qualified, but under the condition of extraneous ature of coal fluctuation, the pollutant removing condition can not meet, and causes pollutant to exceed standard.
For NOx removes, at coal type change, particularly, in the performing low-load running of machine set situation, SCR reactor inlet flue-gas temperature is on the low side, has a strong impact on the denitration devoting rate.The cardinal principle of SCR denitride technology is, ammonia is reacted with nitrogen oxide, generates nitrogen and water, and precondition is to have catalyst (as vanadic anhydride) and rational reaction temperature (300 ℃～420 ℃).But due to the ature of coal reason, often occur the too low situation of temperature in the SCR reactor, and some unit, for a long time in the underrun state, causes and can't normally spray ammonia at present, has a strong impact on denitration efficiency.Part electricity power enterprise, for improving denitration efficiency, adopts the method that strengthens the ammonia amount, has not only increased the denitrogenation cost, and may cause ammonia leakage, causes secondary pollution.
The utility model content
The technical problem that the utility model solves is providing a kind of structure that can improve the SCR reactor inlet temperature, practical operation situation according to unit, reasonable approach is for improving the SCR reactor inlet temperature the most, the raising of flue-gas temperature also is conducive to the operation of downstream air preheater, to improving first and second air temperature, prevent that the air preheater cold end corrosion from having played certain effect.
The technological means that the utility model adopts is: a kind of structure that improves coal-burning boiler tail flue gas denitration devoting rate, it comprises SCR reactor and SCR upstream heat exchanger, be provided with by-pass flue between second gas approach of in the first gas approach and the heat exchange of SCR upstream of SCR reactor, answering device, this by-pass flue is provided with controllable register.
The beneficial effect that the utility model produces is as follows: the present invention introduces the SCR reactor inlet by the high temperature position flue gas, can effectively improve SCR inside reactor temperature, can effectively guarantee that SCR reactor inlet flue-gas temperature is within best reduction temperature scope, thereby improve the denitrogenation devoting rate.The utility model is simple in structure, cheap, can in numerous coal fired power plants, promoted.
In addition, the present invention also possesses following advantage.
(1) the present invention only need be installed by-pass flue additional at SCR entrance pipeline section place and its heat transmission equipment entrance pipeline section place, upstream, and remodeling method is simple, and with low cost.
(2) the present invention is in actual moving process, and the valve that only needs to regulate on by-pass flue can conveniently be controlled the SCR inlet temperature, simple and easy to do.
(3) the present invention also is conducive to optimization downstream, downstream air preheater operating condition, and then improves whole boiler efficiency.
(4) the present invention has certain coordinative role to the heat distribution of boiler part heat transmission equipment.
The accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
The specific embodiment
As shown in Figure 1, a kind of structure that improves coal-burning boiler tail flue gas denitration devoting rate, it comprises SCR reactor 4 and SCR upstream heat exchanger 3, be provided with by-pass flue 1 between second gas approach 31 of in the first gas approach 41 and the heat exchange of SCR upstream of SCR reactor 4, answering device 3, this by-pass flue 1 is provided with controllable register 2.
In the situation that in the first gas approach 41 of SCR reactor 4, flue-gas temperature is on the low side, by regulating the controllable register 2 on by-pass flue 1, the flue gas of the second gas approach 31 positions of upstream heat exchanger 3 can be imported, rationally to control the high-temperature flue gas flow, improve the catalytic reduction reaction temperature, and then improve the denitrogenation devoting rate.Wherein, this upstream heat exchanger 3 can be generally low-level (stack-gas) economizer, superheater or reheater etc.
Claims (1)
1. a structure that improves coal-burning boiler tail flue gas denitration devoting rate, it comprises SCR reactor and SCR upstream heat exchanger, it is characterized in that, be provided with by-pass flue between second gas approach of in the first gas approach and the heat exchange of SCR upstream of SCR reactor, answering device, this by-pass flue is provided with controllable register.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204215272U CN203316011U (en) | 2013-07-16 | 2013-07-16 | Structure for improving coal-fired boiler tail smoke denitration input rate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204215272U CN203316011U (en) | 2013-07-16 | 2013-07-16 | Structure for improving coal-fired boiler tail smoke denitration input rate |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203316011U true CN203316011U (en) | 2013-12-04 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204215272U Expired - Fee Related CN203316011U (en) | 2013-07-16 | 2013-07-16 | Structure for improving coal-fired boiler tail smoke denitration input rate |
Country Status (1)
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| CN (1) | CN203316011U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132358A (en) * | 2014-06-12 | 2014-11-05 | 广东电网公司电力科学研究院 | Coal-fired power plant boiler system suitable for low-load operation and combustion adjusting method of boiler system |
| CN105423322A (en) * | 2015-12-17 | 2016-03-23 | 华电郑州机械设计研究院有限公司 | Low-load system increasing denitration flue gas temperature |
| CN109876662A (en) * | 2019-04-19 | 2019-06-14 | 中国科学院过程工程研究所 | SCR denitration system and method for denitration suitable for cement producing line kiln exit gas |
-
2013
- 2013-07-16 CN CN2013204215272U patent/CN203316011U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104132358A (en) * | 2014-06-12 | 2014-11-05 | 广东电网公司电力科学研究院 | Coal-fired power plant boiler system suitable for low-load operation and combustion adjusting method of boiler system |
| CN105423322A (en) * | 2015-12-17 | 2016-03-23 | 华电郑州机械设计研究院有限公司 | Low-load system increasing denitration flue gas temperature |
| CN109876662A (en) * | 2019-04-19 | 2019-06-14 | 中国科学院过程工程研究所 | SCR denitration system and method for denitration suitable for cement producing line kiln exit gas |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA POWER ENGINEERING CONSULTING GROUP NORTH CHI Free format text: FORMER NAME: NORTH CHINA ELECTRIC POWER DESIGN INSTITUTE OF CHINA POWER ENGINEERING CONSULTING GROUP CORPORATION |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 100120 Beijing city Xicheng District Street No. 24 Patentee after: NORTH CHINA POWER ENGINEERING CO., LTD. OF CHINA POWER ENGINEERING CONSULTING Group Address before: 100120 Beijing city Xicheng District Street No. 24 Patentee before: NORTH CHINA POWER ENGINEERING CO., LTD. OF CHINA POWER ENGINEERING CONSULTING Group |
|
| 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: 20131204 |