CN106362590A - Flue gas system and method for raising fume temperature of inlet of SCR (Selective Catalytic Reduction) denitration device - Google Patents
Flue gas system and method for raising fume temperature of inlet of SCR (Selective Catalytic Reduction) denitration device Download PDFInfo
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- CN106362590A CN106362590A CN201610954326.7A CN201610954326A CN106362590A CN 106362590 A CN106362590 A CN 106362590A CN 201610954326 A CN201610954326 A CN 201610954326A CN 106362590 A CN106362590 A CN 106362590A
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- flue gas
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- gas system
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
- Chimneys And Flues (AREA)
Abstract
The application belongs to the field of a flue gas system of a coal-fired unit of a power plant, and particularly relates to a flue gas system and a method for raising a fume temperature of an inlet of an SCR (Selective Catalytic Reduction) denitration device. The invention provides the flue gas system which is simple in structure, easy to manufacture and easy to operate in the running process. The invention further provides a method for raising the fume temperature of the inlet of the SCR denitration device. The method is based on the flue gas system and comprises the following steps of: when a boiler operates under a low load, according to a reading of a front fume temperature measurement point of the SCR denitration device, regulating openings of an inlet flue gas automatic baffle and an outlet flue gas automatic baffle; controlling a volume of high-temperature flue gas extracted by a hearth; raising the fume temperature at the inlet of the SCR denitration device by heat transfer. The high-temperature flue gas raises a temperature of water feeding in a heat exchanger by heat transfer, raises a rear fume temperature of an economizer, simultaneously, is mixed with flue gas flowing through the economizer in the front of the denitration device to transfer heat, and implements double temperature raising, so that the fume temperature of the inlet of the SCR denitration device is rapidly raised and can be suitable for the boiler to run under the full-load working condition.
Description
Technical field
The invention belongs to power plant soot unit flue gas system field is and in particular to a kind of flue gas system and improve scr and take off
The method of nitre device portal cigarette temperature.
Background technology
With the raising year by year increasing with thermal power plant's air pollution emission requirement of China's power consumption, how to reduce nitrogen oxidation
The discharge of thing has become as one of main task of power plant.SCR (scr) technology denitration removes efficiency high, secondary dirt
Dye is little, is therefore main denitration means in current power plant.In scr device, reactor catalyst is the important set of this system
Become part, but catalyst is only active in the range of 308～420 DEG C, departs from this region, the ammonia spraying into will cause catalysis
Agent poisoning or even inefficacy, lead to the serious reduction of denitration efficiency the most at last or do not play denitration effect completely.
Content of the invention
In view of this, the invention discloses a kind of method of raising scr denitrification apparatus inlet flue gas temperature, specific embodiments are such as
Under:
A kind of flue gas system, comprising: inlet flue gas electric guard board, exiting flue gas electric guard board and heat exchanger；
Described inlet flue gas electric guard board and exiting flue gas electric guard board are installed vertically in bypass flue, are sequentially located at institute
State the entrance and exit both sides of bypass flue；
Described heat exchanger is installed in bypass flue, positioned at described inlet flue gas electric guard board and exiting flue gas electric guard board
Between；
Described bypass flue is connected with flue collector.
Preferably, the entrance of described bypass flue is connected with burner hearth.
Preferably, described flue gas system also includes: water inlet pipe, outlet conduit and water-supply valve；Described water inlet pipe and going out
Waterpipe is connected with described heat exchanger；Described water-supply valve is installed in series on described water inlet pipe.
Preferably, described flue gas system also includes: economizer header and economizer；Described economizer is arranged at described province coal
In device header；Described economizer header connects described outlet conduit and is arranged at the entrance of described flue collector.
Preferably, described economizer is also connected with low temperature superheater.
Preferably, described flue gas system also includes: scr denitrification apparatus；Described scr denitrification apparatus are arranged at described flue collector
Outlet.
A kind of method of raising scr denitrification apparatus inlet flue gas temperature, is used based on above-mentioned flue gas system, walks including following
Rapid:
When boiler at low load runs, inlet flue gas electricity is slowly adjusted according to the front cigarette temperature measuring point reading of scr denitrification apparatus
Dynamic baffle plate and the aperture of exiting flue gas electric guard board, control the high-temperature flue gas amount that bypass flue extracts from burner hearth, by heat transfer
Improve scr denitrification apparatus inlet flue gas temperature.
Preferably, methods described also includes: when the non-underrun of boiler, cigarette temperature measuring point reading before scr denitrification apparatus
Meet prerequisite, then control described inlet flue gas electric guard board to close.
Preferably, described prerequisite is the catalyst allowed band being built in described scr denitrification apparatus.
Compared with prior art, a kind of flue gas system disclosed by the invention, structure is simply it is easy to transforming and operating, sexual valence
Than high.A kind of method of raising scr denitrification apparatus inlet flue gas temperature disclosed in this invention, by extracting burner hearth high-temperature flue gas, both
Improve the rear cigarette temperature of economizer, but before described denitrification apparatus with the flue gas contact heat transfer flowing through described economizer, dual liter
Temperature is so that scr denitrification apparatus inlet flue gas temperature raises quickly, and adapts to the operation of boiler full load mode.The present invention is by this flue gas
System is applied to power plant soot unit flue gas system field, effectively improves scr inlet flue gas temperature, reduces boiler smoke nitrogen oxides
Discharge capacity, environmental protection.
Brief description
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Have technology description in required use accompanying drawing be briefly described it should be apparent that, drawings in the following description be only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing providing obtains other accompanying drawings.
Fig. 1 is a kind of structural representation of the flue gas system disclosed in the preferred embodiment of the present invention.
Specific embodiment
A kind of method of raising scr out of stock device portal cigarette temperature, its flue gas system includes: scr denitrification apparatus, flue collector,
Bypass cigarette, the heat exchanger that is placed in bypass and be inserted into entering in bypass flue, exiting flue gas baffle plate and economizer.By described side
The entrance of road flue connects and burner hearth, and from burner hearth extracting high-temperature flue gas, outlet connects and scr device smoke inlet, the main cigarette with described scr
Road merges.Described heat exchanger is placed in described bypass flue, before in water supply system, position is in economizer.
When the middle and high load operation of boiler, the inlet flue gas temperature of scr denitrification apparatus, in catalyst allowed band, bypasses cigarette
Road gateway electrodynamic valve cuts out, and system does not put into operation.
When boiler at low load runs, scr denitrification apparatus inlet flue gas temperature reduces, the now entrance according to scr denitrification apparatus
Flue-gas temperature measuring point reading adjusting the inlet flue gas baffle plate of described bypass flue and the aperture of exiting flue gas baffle plate, thus controlling
The high-temperature flue gas amount extracting from burner hearth.The feedwater that the high-temperature flue gas extracting first are opposite in the heat exchanger in bypass flue carries out adding
Heat, feed temperature before lifting economizer, thus reduce feedwater absorb heat in economizer；After flowing through heat exchanger, high-temperature flue gas again with
Flue gas mixing in flue collector, improves scr inlet flue gas temperature, under the dual thermogenic action of here, before scr, flue-gas temperature can be in pot further
Maintain in the range of stove full load mode in scr reactor catalyst allowed band.
Below in conjunction with the specific embodiment of the invention, technical scheme is clearly and completely described it is clear that
Described embodiment is a part of embodiment of the present invention, rather than whole embodiments.Those skilled in the art should manage
Solution, modifies to the specific embodiment of the present invention or some technical characteristics is replaced on an equal basis, without deviating from the present invention
The spirit of technical scheme, all should cover in the scope of protection of the invention.
Fig. 1 is a kind of structural representation of the flue gas system disclosed in the embodiment of the present invention, as shown in figure 1, institute of the present invention
Disclosed a kind of flue gas system, comprising: inlet flue gas electric guard board (1), exiting flue gas electric guard board (2) and heat exchanger (3)；Institute
State inlet flue gas electric guard board (1) and exiting flue gas electric guard board (2) is installed vertically in bypass flue (4), be sequentially located at institute
State the entrance and exit both sides of bypass flue (4)；Described heat exchanger (3) is installed in bypass flue (4), positioned at described entrance cigarette
Between gas electric guard board (1) and described exiting flue gas electric guard board (2)；Described bypass flue (4) is connected with flue collector (5)；Institute
The entrance stating bypass flue (4) is connected with burner hearth.
Described flue gas system also includes: scr denitrification apparatus (6)；Described scr denitrification apparatus (6) are arranged at described flue collector
(5) outlet.
Described flue gas system also includes: water inlet pipe (7), outlet conduit (8) and water-supply valve (9)；Described water inlet pipe (7)
Connect with described heat exchanger (3) with outlet conduit (8)；Described water-supply valve (9) is installed in series on described water inlet pipe (7).
Described flue gas system also includes: economizer header (10) and economizer (11)；Described economizer (11) is installed on institute
State in economizer header (10)；Described economizer header (10) connects described outlet conduit (8) and is arranged at described flue collector (5)
Entrance；Described economizer (11) is also connected with low temperature superheater.
A kind of method of raising scr denitrification apparatus inlet flue gas temperature, comprising:
Outlet conduit (8) in above-mentioned flue gas system is connect and economizer header (10)；
The entrance of the bypass flue (4) in described flue gas system is connect and burner hearth；
When the middle and high load operation of boiler, scr inlet flue gas temperature in catalyst allowed band, going out in bypass flue (4)
Mouth flue gas electric guard board (2) and inlet flue gas electric guard board (1) are closed, and described flue gas system does not put into operation；
When boiler at low load runs, described inlet flue gas electric guard board is slowly adjusted according to cigarette temperature measuring point reading before scr
(1) and exiting flue gas electric guard board (2) aperture, control described bypass flue (4) the high-temperature flue gas amount that extracts from described burner hearth,
Scr denitrification apparatus inlet flue gas temperature is improved by heat transfer.
Wherein, the feedwater of the heat exchanger (3) that described high-temperature flue gas are opposite in bypass flue (4) first is heated, and carries
Rise feed temperature before economizer, reduce feedwater and absorb heat in economizer (11), thus improve the rear cigarette temperature of economizer (11)；?
After flowing through heat exchanger (3), high-temperature flue gas are mixed in flue collector (5) with the flue gas flowing through economizer (11) again, improve further
Scr inlet flue gas temperature, under the dual thermogenic action of here, the inlet flue gas temperature of scr denitrification apparatus raises quickly, can be in boiler full load work
Maintain in the range of condition in scr reactor catalyst allowed band, and adapt to boiler full load mode and run.
In sum, a kind of flue gas system disclosed in this invention, structure is simply it is easy to transforming and operate, cost performance being high.
A kind of method of raising scr denitrification apparatus inlet flue gas temperature disclosed in this invention, by extracting burner hearth high-temperature flue gas, both improve
The rear cigarette temperature of economizer, but before described denitrification apparatus with flow through the flue gas contact heat transfer of described economizer, dual intensification so that
Scr denitrification apparatus inlet flue gas temperature raises quickly, and adapts to the operation of boiler full load mode.This flue gas system is applied by the present invention
In power plant soot unit flue gas system field, effectively improve scr inlet flue gas temperature, reduce the discharge capacity of boiler smoke nitrogen oxides,
Environmental protection.
Claims (9)
1. a kind of flue gas system, comprising: inlet flue gas electric guard board, exiting flue gas electric guard board and heat exchanger；
Described inlet flue gas electric guard board and exiting flue gas electric guard board are installed vertically in bypass flue, are sequentially located at described side
The entrance and exit both sides of road flue；
Described heat exchanger is installed in bypass flue, positioned at described inlet flue gas electric guard board and exiting flue gas electric guard board it
Between；
Described bypass flue is connected with flue collector.
2. flue gas system according to claim 1 is it is characterised in that the entrance of described bypass flue is connected with burner hearth.
3. flue gas system according to claim 1 is it is characterised in that also include: water inlet pipe, outlet conduit and feedwater
Valve；
Described water inlet pipe is connected with described heat exchanger with outlet conduit；
Described water-supply valve is installed in series on described water inlet pipe.
4. flue gas system according to claim 1 is it is characterised in that also include: economizer header and economizer；
Described economizer is arranged in described economizer header；
Described economizer header connects described outlet conduit and is arranged at the entrance of described flue collector.
5. flue gas system according to claim 1 is it is characterised in that described economizer is also connected with low temperature superheater.
6. flue gas system according to claim 1 is it is characterised in that also include: scr denitrification apparatus；
Described scr denitrification apparatus are arranged at the outlet of described flue collector.
7. a kind of method of raising scr denitrification apparatus inlet flue gas temperature, based on flue gas system as described in claim 1-6 any one
Used it is characterised in that being comprised the following steps:
When boiler at low load runs, inlet flue gas electric gear is slowly adjusted according to the front cigarette temperature measuring point reading of scr denitrification apparatus
Plate and the aperture of exiting flue gas electric guard board, the high-temperature flue gas amount controlling bypass flue to extract from burner hearth, is improved by heat transfer
Scr denitrification apparatus inlet flue gas temperature.
8. method according to claim 7 is it is characterised in that also include:
When the non-underrun of boiler, before scr denitrification apparatus, cigarette temperature measuring point reading meets prerequisite, then control described entrance
Flue gas electric guard board is closed.
9. method according to claim 8 is it is characterised in that described prerequisite is to be built in described scr denitrification apparatus
Catalyst allowed band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610954326.7A CN106362590A (en) | 2016-11-03 | 2016-11-03 | Flue gas system and method for raising fume temperature of inlet of SCR (Selective Catalytic Reduction) denitration device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610954326.7A CN106362590A (en) | 2016-11-03 | 2016-11-03 | Flue gas system and method for raising fume temperature of inlet of SCR (Selective Catalytic Reduction) denitration device |
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| CN106362590A true CN106362590A (en) | 2017-02-01 |
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| CN201610954326.7A Pending CN106362590A (en) | 2016-11-03 | 2016-11-03 | Flue gas system and method for raising fume temperature of inlet of SCR (Selective Catalytic Reduction) denitration device |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN108434988A (en) * | 2018-04-04 | 2018-08-24 | 青岛双瑞海洋环境工程股份有限公司 | The device and method of BOG and yellow smoke plume emission are reduced simultaneously |
| CN108854522A (en) * | 2018-07-02 | 2018-11-23 | 浙江宜清环境技术有限公司 | A kind of heating of full working scope denitration flue gas and even distribution device based on internal baffle |
| CN108939900A (en) * | 2017-05-17 | 2018-12-07 | 昆山市三维换热器有限公司 | Flue-gas denitration process system |
| CN110686266A (en) * | 2019-09-18 | 2020-01-14 | 北京国电龙源环保工程有限公司 | Flue gas temperature raising system capable of realizing low-load operation of SCR (Selective catalytic reduction) denitration system and method thereof |
| CN110935312A (en) * | 2019-12-16 | 2020-03-31 | 广州珠江电力有限公司 | Dynamic monitoring device and dynamic monitoring method for SCR flue gas denitration system |
| 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 |
| CN114791748A (en) * | 2022-05-20 | 2022-07-26 | 湖南省湘电试验研究院有限公司 | Temperature control system of boiler |
| CN115371074A (en) * | 2022-08-29 | 2022-11-22 | 西安热工研究院有限公司 | System for utilize fused salt heat-retaining-heat transfer to promote low-load denitration entry gas temperature |
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| CN105485657A (en) * | 2015-04-28 | 2016-04-13 | 无锡华光锅炉股份有限公司 | Coal economizer bypass flue structure |
| CN205606614U (en) * | 2016-04-27 | 2016-09-28 | 大唐环境产业集团股份有限公司 | SCR method economizer water side is hung a tub bypass flue gas and is carried warm device |
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| US20110311424A1 (en) * | 2010-06-22 | 2011-12-22 | 2E Environmental, LLC | BIOMASS BOILER SCR NOx AND CO REDUCTION SYSTEM |
| CN203944290U (en) * | 2014-02-26 | 2014-11-19 | 福建龙净环保股份有限公司 | A kind of SCR flue gas denitrification system |
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Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108939900A (en) * | 2017-05-17 | 2018-12-07 | 昆山市三维换热器有限公司 | Flue-gas denitration process system |
| 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 |
| CN108434988B (en) * | 2018-04-04 | 2020-06-05 | 青岛双瑞海洋环境工程股份有限公司 | Device and method for simultaneously reducing emission of BOG (boil off gas) and yellow plume |
| CN108434988A (en) * | 2018-04-04 | 2018-08-24 | 青岛双瑞海洋环境工程股份有限公司 | The device and method of BOG and yellow smoke plume emission are reduced simultaneously |
| CN108854522A (en) * | 2018-07-02 | 2018-11-23 | 浙江宜清环境技术有限公司 | A kind of heating of full working scope denitration flue gas and even distribution device based on internal baffle |
| CN110686266A (en) * | 2019-09-18 | 2020-01-14 | 北京国电龙源环保工程有限公司 | Flue gas temperature raising system capable of realizing low-load operation of SCR (Selective catalytic reduction) denitration system and method thereof |
| CN110686266B (en) * | 2019-09-18 | 2021-09-21 | 国能龙源环保有限公司 | Flue gas temperature raising system capable of realizing low-load operation of SCR (Selective catalytic reduction) denitration system and method thereof |
| 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 |
| CN110935312A (en) * | 2019-12-16 | 2020-03-31 | 广州珠江电力有限公司 | Dynamic monitoring device and dynamic monitoring method for SCR flue gas denitration system |
| CN110935312B (en) * | 2019-12-16 | 2022-08-30 | 广州珠江电力有限公司 | Dynamic monitoring device and dynamic monitoring method for SCR flue gas denitration system |
| CN114791748A (en) * | 2022-05-20 | 2022-07-26 | 湖南省湘电试验研究院有限公司 | Temperature control system of boiler |
| CN114791748B (en) * | 2022-05-20 | 2024-04-09 | 湖南省湘电试验研究院有限公司 | Temperature control system of boiler |
| CN115371074A (en) * | 2022-08-29 | 2022-11-22 | 西安热工研究院有限公司 | System for utilize fused salt heat-retaining-heat transfer to promote low-load denitration entry gas temperature |
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Application publication date: 20170201 |