CN203170224U - Heat source supplying device for SCR (Selective Catalytic Reduction) denitration-reductant urea pyrolysis - Google Patents
Heat source supplying device for SCR (Selective Catalytic Reduction) denitration-reductant urea pyrolysis Download PDFInfo
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- CN203170224U CN203170224U CN 201320179396 CN201320179396U CN203170224U CN 203170224 U CN203170224 U CN 203170224U CN 201320179396 CN201320179396 CN 201320179396 CN 201320179396 U CN201320179396 U CN 201320179396U CN 203170224 U CN203170224 U CN 203170224U
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- urea pyrolysis
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Abstract
The utility model discloses a heat source supplying device for SCR (Selective Catalytic Reduction) denitration-reductant urea pyrolysis, belonging to the field of the preparation of flue gas denitration reductants. The heat source supplying device comprises a boiler flue gas area, a hot primary air production device and a urea pyrolysis reactor, wherein the temperature of flue gas in the boiler flue gas area is 400-900 DEG C, and the hot primary air production device is arranged in a boiler; and a heat exchanger is arranged in the boiler flue gas area and is connected with the hot primary air production device in the boiler, hot primary air of the hot primary air production device is introduced into the heat exchanger and is heated by the flue gas in the boiler flue gas area, and the hot primary air heated by the heat exchanger is introduced into the urea pyrolysis reactor. The heat source supplying device for SCR denitration-reductant urea pyrolysis, disclosed by the utility model, has the advantage that the energy consumption and operating cost of a urea pyrolysis process are lower.
Description
Technical field
The utility model belongs to denitrating flue gas reducing agent preparation field.
Background technology
Selective catalytic reduction flue gas denitration technology (Selective Catalytic Reduction of NOx, be called for short SCR denitrating technique) reducing agent mainly contains three kinds in liquefied ammonia, ammoniacal liquor, urea.Liquefied ammonia is because process system is simple, and investment and operating cost are lower, in the SCR denitrating technique, use wider, but liquefied ammonia belongs to hazardous chemical, its transportation and storage request harshness, and get permission to examine the restriction that also is subjected to rules more and more, very inconvenient; Equally, ammoniacal liquor is also because its transportation, storage problem and investment operating cost occupy high and limitation that used; SCR denitrification reducing agent-the urea relatively low as security requirement has the denitration performance identical with liquefied ammonia, and danger product regulation limitations can not betransported easily, stores and use.
Urea is as the SCR denitrification reducing agent, and main technique has pyrolysis ammonia processed and hydrolysis Ammonia Process, wherein the pyrolysis Ammonia Process since system simple, cost of investment is low, stable, maintenance is little, also adopted by power plant more and more.Urea pyrolysis thermal source mainly is to adopt a wind of boiler hot to dispose electric heater or combustion heater simultaneously at present, as for 600MW grade unit equipment for denitrifying flue gas, adopt the energy consumption of electrically heated urea pyrolytic process to be: 500kW/h-1800kW/h, urea pyrolysis energy consumption is big, operating cost is high.
The utility model content
The purpose of this utility model is: propose the lower SCR denitrification reducing agent urea pyrolysis thermal source feedway of a kind of urea pyrolytic process energy consumption and operating cost.
The utility model purpose realizes by following technical proposals:
A kind of SCR denitrification reducing agent urea pyrolysis thermal source feedway, the boiler smoke zone that comprises 400 ℃-900 ℃ of flue-gas temperatures, produce the device of a wind of heat in the boiler, and urea pyrolysis reactor, arrange heat exchanger in described boiler smoke zone, the device that produces a wind of heat in described heat exchanger and the described boiler is connected and introduces a wind of its heat by the flue gas heating in described boiler smoke zone, and a wind of the heat after described heat exchanger heats is introduced described urea pyrolysis reactor.
As optimal way, the inlet duct of described heat exchanger is provided with the entrance air door, and described heat exchanger also is provided with bypass duct and the bypass air door thereof that is communicated to its outlet conduit by the inlet duct of heat exchanger.
As further preferred embodiment, described urea pyrolysis reactor inlet duct is provided with the temperature monitoring of controlling described entrance air door and bypass throttle opening according to its temperature.
As optimal way, the urea pyrolysis air duct that the device that produces a wind of heat in connecting described boiler is introduced a wind of described heat arranges adjustable damper, and be communicated with described heat exchanger entrance by described inlet duct respectively, and be communicated with described heat exchanger exit by described bypass duct.
As optimal way, described boiler smoke zone is flue gas zone, boiler economizer upstream.
As further preferred embodiment, described boiler smoke zone is low temperature superheater or low-temperature reheater zone.
As optimal way, the device that produces a wind of heat in the described boiler is air preheater.
As optimal way, described heat exchanger is gas air-tube type heat exchanger.
The course of work is: heat exchanger is arranged in the flue gas zone at boiler, and a wind that utilizes the boiler high temperature flue gas will be incorporated into the boiler hot in the heat exchanger is heated to the urea pyrolysis temperature, as thermal source and the energy of SCR denitrification reducing agent urea pyrolysis.This arrangement is little or can ignore substantially to the influence of boiler, and as the SCR equipment for denitrifying flue gas of 600MW grade, the layout of heat exchanger is no more than 2 ℃ to the flue gas temperature drop in zone.
Regulate for a wind-warm syndrome degree after guaranteeing to heat satisfies urea pyrolytic process demand and is convenient to, heat exchanger arranges bypass duct, and heat exchanger entrance air door and bypass air door are set, and by blending heating AIR Proportional, regulates the air themperature of supplying with the urea pyrolysis.
The total pipeline of introducing at wind (urea pyrolysis air duct) arranges adjustable damper, changes required air capacity/heat-source energy total be used for regulating the urea pyrolysis with boiler load.
The beneficial effects of the utility model: can significantly reduce the energy consumption of SCR denitrification reducing agent urea pyrolytic process and station service, saving operating cost, and this arrangement is little or can ignore substantially to the influence of boiler.
Description of drawings
Fig. 1 is the device schematic flow sheet of the utility model embodiment.
The specific embodiment
Following non-limiting examples is used for explanation the utility model.
As shown in Figure 1, the wind 31(that urea pyrolysis air duct 21 connects the heat of drawing air preheater 3 accounts for total blast volume 0.5-5%, temperature 0-400 ℃, pressure 10 ± 5kPa), enter gas air-tube type heat exchanger 23 through gas air-tube type heat exchanger entrance pipeline 22, by boiler smoke 11 heating, air in the gas air-tube type heat exchanger 23 is heated to the temperature suitable with flue-gas temperature, satisfies 400 ℃-900 ℃ of urea pyrolysis temperatures.Air after the heating enters urea pyrolysis reactor 4 via gas air-tube type heat exchanger exit pipeline 25, urea pyrolysis reactor inlet duct 26, in urea pyrolysis reactor 4, urea liquid is generated the ammonia gas mixture body by pyrolysis, and the ammonia gas mixture body enters denitration reaction device 5 by urea liquid thermal decomposition product pipeline 41 and carries out denitration.
Gas air-tube type heat exchanger 23 is arranged in the flue gas zone 12 as 400 ℃-900 ℃ of flue-gas temperatures such as low temperature superheater or low-temperature reheater of boiler economizer 13 upstreams.Gas air-tube type heat exchanger 23 arranges bypass duct 24, the part air directly enters urea pyrolysis reactor inlet duct 26 by bypass duct 24 without gas air-tube type heat exchanger, and enters urea pyrolysis reactor 4 after air after the heating of gas air-tube type heat exchanger exit pipeline 25 mixes.On urea pyrolysis air duct 21, gas air-tube type heat exchanger entrance pipeline 22, bypass duct 24, adjustable damper 211,221,241 is set respectively.
Urea pyrolysis reactor inlet duct 26 arranges temperature monitoring 27, for detection of the pyrolysis air themperature that enters urea pyrolysis reactor 4 and chain control.When the pyrolysis air themperature that enters urea pyrolysis reactor 4 surpasses or is lower than design temperature (as 650 ℃), can by reduce on (or increase) gas air-tube type heat exchanger entrance pipeline 22 adjustable damper 221 apertures, and increase the aperture of the adjustable damper 241 on (or reducing) bypass duct 24, by blending heating AIR Proportional, make the pyrolysis air themperature reach design temperature.Adjustable damper 211 on the urea pyrolysis air duct 21 is used for regulating the urea pyrolysis and changes needed total primary air flow and thermal source with boiler load.
When urea pyrolysis air is not when drawing wind of heat of the pressure 10 ± 5kPa that connects, can set up blower fan and improve air pressure to reach the needed pressure of urea pyrolysis system.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection domain of the present utility model.
Claims (8)
1. SCR denitrification reducing agent urea pyrolysis thermal source feedway, the boiler smoke zone that comprises 400 ℃-900 ℃ of flue-gas temperatures, produce the device of a wind of heat in the boiler, and urea pyrolysis reactor, it is characterized in that: arrange heat exchanger in described boiler smoke zone, the device that produces a wind of heat in described heat exchanger and the described boiler is connected and introduces a wind of its heat by the flue gas heating in described boiler smoke zone, and a wind of the heat after described heat exchanger heats is introduced described urea pyrolysis reactor.
2. SCR denitrification reducing agent urea pyrolysis thermal source feedway as claimed in claim 1, it is characterized in that: the inlet duct of described heat exchanger is provided with the entrance air door, and described heat exchanger also is provided with bypass duct and the bypass air door thereof that is communicated to its outlet conduit by the inlet duct of heat exchanger.
3. SCR denitrification reducing agent urea pyrolysis thermal source feedway as claimed in claim 2, it is characterized in that: described urea pyrolysis reactor inlet duct also is provided with the temperature monitoring of controlling described entrance air door and bypass throttle opening according to its temperature.
4. SCR denitrification reducing agent urea pyrolysis thermal source feedway as claimed in claim 1, it is characterized in that: the urea pyrolysis air duct that the device that produces a wind of heat in connecting described boiler is introduced a wind of described heat arranges adjustable damper, and be communicated with described heat exchanger entrance by described inlet duct respectively, and be communicated with described heat exchanger exit by described bypass duct.
5. SCR denitrification reducing agent urea pyrolysis thermal source feedway as claimed in claim 1 is characterized in that: described boiler smoke zone is flue gas zone, boiler economizer upstream.
6. SCR denitrification reducing agent urea pyrolysis thermal source feedway as claimed in claim 5 is characterized in that: described boiler smoke zone is low temperature superheater or low-temperature reheater zone.
7. SCR denitrification reducing agent urea pyrolysis thermal source feedway as claimed in claim 6 is characterized in that: the device that produces a wind of heat in the described boiler is air preheater.
8. the SCR denitrification reducing agent urea pyrolysis thermal source feedway described in arbitrary claim in the claim 1 to 7, it is characterized in that: described heat exchanger is gas air-tube type heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320179396 CN203170224U (en) | 2013-04-11 | 2013-04-11 | Heat source supplying device for SCR (Selective Catalytic Reduction) denitration-reductant urea pyrolysis |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320179396 CN203170224U (en) | 2013-04-11 | 2013-04-11 | Heat source supplying device for SCR (Selective Catalytic Reduction) denitration-reductant urea pyrolysis |
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| Publication Number | Publication Date |
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| CN203170224U true CN203170224U (en) | 2013-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320179396 Withdrawn - After Issue CN203170224U (en) | 2013-04-11 | 2013-04-11 | Heat source supplying device for SCR (Selective Catalytic Reduction) denitration-reductant urea pyrolysis |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103191640A (en) * | 2013-04-11 | 2013-07-10 | 东方电气集团东方锅炉股份有限公司 | SCR (Selective Catalytic Reduction) denitration reducing agent urea pyrolysis heat source supply method and device |
| CN105737642A (en) * | 2016-03-04 | 2016-07-06 | 上海升卓能源科技有限公司 | Urea pyrolysis ammonia preparation energy saving device for boiler smoke denitrification |
| WO2022181586A1 (en) * | 2021-02-24 | 2022-09-01 | 三菱重工業株式会社 | Heat exchange piping configuration for vaporizing ammonia in denitrification device |
-
2013
- 2013-04-11 CN CN 201320179396 patent/CN203170224U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103191640A (en) * | 2013-04-11 | 2013-07-10 | 东方电气集团东方锅炉股份有限公司 | SCR (Selective Catalytic Reduction) denitration reducing agent urea pyrolysis heat source supply method and device |
| CN103191640B (en) * | 2013-04-11 | 2015-11-18 | 东方电气集团东方锅炉股份有限公司 | A kind of SCR denitration reducing agent urea pyrolysis thermal source supply method and device |
| CN105737642A (en) * | 2016-03-04 | 2016-07-06 | 上海升卓能源科技有限公司 | Urea pyrolysis ammonia preparation energy saving device for boiler smoke denitrification |
| WO2022181586A1 (en) * | 2021-02-24 | 2022-09-01 | 三菱重工業株式会社 | Heat exchange piping configuration for vaporizing ammonia in denitrification device |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130904 Effective date of abandoning: 20151118 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |