CN107366897B - A kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system - Google Patents
A kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system Download PDFInfo
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- CN107366897B CN107366897B CN201710541211.XA CN201710541211A CN107366897B CN 107366897 B CN107366897 B CN 107366897B CN 201710541211 A CN201710541211 A CN 201710541211A CN 107366897 B CN107366897 B CN 107366897B
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- flue
- heat exchanger
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/20—Sulfur; Compounds thereof
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2217/00—Intercepting solids
- F23J2217/10—Intercepting solids by filters
- F23J2217/102—Intercepting solids by filters electrostatic
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
- Air Supply (AREA)
Abstract
The present invention relates to a kind of Pollutant in Coal Burning Boiler emission reductions to optimize collaboration fume afterheat deep exploitation system, its both can heat transfer loss in reduction system, increase fume afterheat utilization rate, the regulation that can realize pollution reduction equipment entrance smoke temperature again, has taken into account the promotion of unit energy-saving and emission-reduction ability.The system includes boiler flue collector, high temperature bypass flue and low temperature bypass flue, is wherein sequentially arranged level-one high-pressure economizer, SCR flue gas denitrification system, high-temperature air preheater, low-temperature air preheater, electric precipitator, a grade low-temp cigarette water- to-water heat exchanger, desulfurizing tower and chimney along flue gas flow direction in boiler flue collector；Second level high-pressure economizer and high temperature cigarette water- to-water heat exchanger are sequentially arranged along flue gas flow direction in high temperature bypass flue；Two grade low-temp cigarette water- to-water heat exchangers are arranged in low temperature bypass flue；Level-one high-pressure economizer and second level high-pressure economizer arranged in series；The air-water heat exchanger and a grade low-temp cigarette water- to-water heat exchanger of pressure fan outlet realize enclosed water circulation heat exchange by water circulating pump.
Description
Technical field
The present invention relates to coal-fired power generation fields, and in particular to a kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat
Deep exploitation system.
Background technique
Coal is main non-renewable energy in China, accounts for 60% of total energy consumption or more, wherein coal consumption for power generation accounts for
50%.For coal-burning boiler, heat loss due to exhaust gas be influence boiler thermal efficiency principal element, account for about the 50% of boiler heat loss with
On, if recycling by 130-160 DEG C of exhaust gas temperature estimation to flue gas waste heat at the end of boiler, 0.7 hundred million tons of coal of mark can be saved every year
Left and right；In addition, the pollutant discharge amounts such as NOx, SO2 and dust that coal-burning boiler generates account for about the 39% of national total release, 31%
With 14%, therefore, fume afterheat is utilized and pollution reduction is always that domestic and foreign scholars carry out coal unit energy-saving and emission-reduction and study
Main way.
Currently, fire coal boiler fume UTILIZATION OF VESIDUAL HEAT IN mainly uses more than the low-pressure coal saver recycling smoke evacuation for being mounted on boiler tail
Heat, to heat steam turbine condensed water, to squeeze corresponding backheat pumping, the steam squeezed, which returns to steam turbine, to be continued to do
Function then improves the economy of unit, reduces heat consumption rate and coal consumption for power generation, this technical application is extensive, but its simultaneously there is also
The problems such as waste heat energy level is low, and UTILIZATION OF VESIDUAL HEAT IN is few.Pollution reduction equipment is mainly using the SCR cigarette being mounted in boiler back end ductwork
Gas denitrating system, electric precipitation and desulfurizing tower remove pollutant, the discharge of NOx, SO2 and dust can be made to reach state substantially
Family's standard.However by field application, the problem of finding these equipment generally existing inlet flue gas temperature off-target value, directly affect
Equipment reliability of operation and economy, major embodiment in the following areas: (1) SCR flue gas denitrification system inlet flue gas temperature is relatively low, low
It is more prominent under load, cause denitration efficiency to decline, even will appear the case where can not putting into operation when serious；(2) electric precipitation entrance
Smoke temperature is higher, and efficiency of dust collection is caused accordingly to reduce；(3) desulfurizing tower gas approach is higher, and desulfurization water consumption is caused to increase.But
In traditional coal-burning boiler air and flue system, these equipment lack smoke temperature regulating measure, can not effectively control inlet flue gas temperature, thus
Constrain the energy-saving and emission-reduction ability of coal unit.In view of problem above, domestic and foreign scholars are to fire coal boiler fume UTILIZATION OF VESIDUAL HEAT IN system
System and pollution reduction system have carried out many special items respectively, also achieve larger effect, but since fume afterheat utilizes
System and pollution reduction system have biggish relevance, and the two is not held to avoid to exist during runing adjustment and is servo-actuated
Property, it cannot be considered in terms of the runnability of distinct device, to limit the excavation of unit energy-saving and emission-reduction ability.
Summary of the invention
To overcome the above deficiencies, the invention provides the heat transfer loss in a kind of reduction system, increase flue gas
Utilization rate of waste heat and the adjustable Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat depth of pollution reduction equipment entrance smoke temperature
Degree utilizes system.
The present invention overcomes the technical solution used by its technical problem to be:
A kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system, the flue collector including boiler with
And chimney, the flue gas in the flue collector successively pass through level-one high-pressure economizer, SCR flue gas denitrification system, high temperature air preheating
Device, low-temperature air preheater, electric precipitator, a grade low-temp cigarette water- to-water heat exchanger, desulfurizing tower and chimney, further includes:
High temperature bypass flue, input end are connected to the main cigarette between SCR flue gas denitrification system and high-temperature air preheater
In road, outlet end is connected in the flue collector between high-temperature air preheater and low-temperature air preheater, the high temperature bypass
Second level high-pressure economizer and high temperature cigarette water- to-water heat exchanger, the second level high-pressure economizer are set gradually along flow of flue gas direction in flue
It is connected to the outlet pipe of high-pressure heater with the water inlet pipe of level-one high-pressure economizer arranged in series, second level high-pressure economizer, is gone out
Water pipe is connected to the water inlet pipe of level-one high-pressure economizer, and the water inlet pipe of the high temperature cigarette water- to-water heat exchanger is connected to the outlet of feed pump
Pipe, outlet pipe are connected to the water inlet pipe of second level high-pressure economizer；
Low temperature bypass flue, input end are connected to the flue collector between high-temperature air preheater and low-temperature air preheater
In, outlet end is connected in the flue collector between low-temperature air preheater and electric precipitator, cloth in the low temperature bypass flue
Two grade low-temp cigarette water- to-water heat exchangers are equipped with, the water inlet pipe of the two grade low-temps cigarette water- to-water heat exchanger is connected to the condensed water of low-pressure heater
Pipe, outlet pipe are connected to oxygen-eliminating device inlet tube.
It further include air water heat exchange to adjust low-temperature air preheater entering air temperature and desulfurizing tower entrance flue gas temperature
Device, air-water heat exchanger are set in the air duct between the outlet and low-temperature air preheater of the pressure fan of boiler；The air water changes
Hot device and a grade low-temp cigarette water- to-water heat exchanger pass through water circulating pump progress enclosed water circulation heat exchange.
It utilizes to optimize the fume afterheat of feed temperature, SCR denitration system inlet flue gas temperature and high temperature bypass flue, also wraps
Include the high temperature bypass valve being set on high temperature bypass flue.
In order to optimize electric precipitation entrance flue gas temperature, low temperature bypass flue fume afterheat utilizes, and further includes being set to low temperature
Low temperature bypass valve on bypass flue.
The beneficial effects of the present invention are: passing through air preheater gas bypass, high-pressure economizer classification and low temperature cigarette water- to-water heat exchanger
Reasonable Arrangement, improve the energy level of fume afterheat, increase the utilization rate of fume afterheat, while it is de- to realize SCR flue gas again
The regulation of nitre system, electric precipitator and desulfurizing tower inlet flue gas temperature significantly improves the operation of Pollutant in Coal Burning Boiler emission abatement device
Reliability and economy；In addition, by organic between air preheater classification, air preheater gas bypass and air-supply heating system
Coupling, had both reduced wind and smoke temperature gradient, and had reduced heat transfer loss, and improved air preheater cold junction temperature, and improved ammonia and escape
The problem of ease causes air preheater to block.
Detailed description of the invention
Fig. 1 is system structure connection schematic diagram of the invention；
In figure, 1. flue collector, 2. level-one high-pressure economizer 3.SCR flue gas denitrification system, 4. high-temperature air preheater 5.
6. electric precipitator of low-temperature air preheater, 7. 1 9. chimney of grade low-temp cigarette 8. desulfurizing tower of water- to-water heat exchanger, 10. high temperature bypasses cigarette
14. low temperature bypass flue 15. of road 11. high temperature bypass valve, 12. second level high-pressure economizer, 13. high temperature cigarette water- to-water heat exchanger
16. 2 18. high-pressure heater of grade low-temp cigarette 17. feed pump of water- to-water heat exchanger of low temperature bypass valve, 19. low-pressure heater 20.
23. water circulating pump of oxygen-eliminating device 21. pressure fan, 22. air-water heat exchanger, 24. boiler.
Specific embodiment
1 the present invention will be further described with reference to the accompanying drawing.
A kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system, the flue collector including boiler 24
1 and chimney 9, it is pre- that the flue gas in flue collector 1 successively passes through level-one high-pressure economizer 2, SCR flue gas denitrification system 3, high temperature air
Hot device 4, low-temperature air preheater 5, electric precipitator 6, a grade low-temp cigarette water- to-water heat exchanger 7, desulfurizing tower 8 and chimney 9.Further include: it is high
Warm bypass flue 10, input end are connected in the flue collector 1 between SCR flue gas denitrification system 3 and high-temperature air preheater 4,
Its outlet end is connected in the flue collector 1 between high-temperature air preheater 4 and low-temperature air preheater 5, high temperature bypass flue 10
It is middle to set gradually second level high-pressure economizer 12 and high temperature cigarette water- to-water heat exchanger 13 along flow of flue gas direction, second level high-pressure economizer 12 with
2 arranged in series of level-one high-pressure economizer, the water inlet pipe of second level high-pressure economizer 12 are connected to the outlet pipe of high-pressure heater 18,
Outlet pipe is connected to the water inlet pipe of level-one high-pressure economizer 2, and the water inlet pipe of high temperature cigarette water- to-water heat exchanger 13 is connected to feed pump 17
Outlet, outlet pipe are connected to the water inlet pipe of second level high-pressure economizer 12.The water supply that feed pump 17 exports is first through high temperature cigarette water
After heat exchanger 13, then with the water outlet of high-pressure heater 18 it is mixed into second level high-pressure economizer 12, finally flowed into connected in series
In level-one high-pressure economizer 2 in flue collector 1.The water supply of feed pump 17 absorbs flue gas heat through high temperature cigarette water- to-water heat exchanger 13, together
When exclusion 18 backheat of partial high pressure heater pumping, realize the heat recovery of flue gas.By 13 institute of high temperature cigarette water- to-water heat exchanger
It is 1-2 times higher than smoke temperature locating for conventional low economizer to locate smoke temperature, to make fume afterheat energy level increase, UTILIZATION OF VESIDUAL HEAT IN amount increases.
Second level high-pressure economizer 12 in high temperature bypass flue 10 is connected with the level-one high-pressure economizer 2 in flue collector 1, not only can guarantee
24 feed temperature of boiler is met the requirements, and can promote the inlet flue gas temperature of the SCR flue gas denitrification system 3 in flue collector 1, is then mentioned
The reliability of its high underrun.
Further include low temperature bypass flue 14, input end be connected to high-temperature air preheater 4 and low-temperature air preheater 5 it
Between flue collector 1 in, outlet end is connected in the flue collector 1 between low-temperature air preheater 5 and electric precipitator 6, by low temperature
Two grade low-temp cigarette water- to-water heat exchangers 16 are disposed in road flue 14, the water inlet pipe of two grade low-temp cigarette water- to-water heat exchangers 16 is connected to low pressure and adds
The condensate pipe of hot device 19, outlet pipe are connected to 20 inlet tube of oxygen-eliminating device.19 condensed water absorption flue gas heat of low-pressure heater,
Squeeze the pumping of 19 backheat of part low-pressure heater simultaneously, realize the heat recovery of flue gas, wherein two grade low-temp cigarette water exchange heat
The principle of " temperature counterpart, cascade utilization " should be met between device 16 and the water temperature of oxygen-eliminating device 20, so that heat transfer loss is minimum, waste heat
Utilize maximum.
It further include air-water heat exchanger 22, air-water heat exchanger 22 is set to the outlet and Cryogenic air of the pressure fan 21 of boiler 24
In air duct between preheater 5；Air-water heat exchanger 22 and a grade low-temp cigarette water- to-water heat exchanger 7 pass through the progress closed-up water of water circulating pump 23
Cycle heat exchange.Its inlet flue gas temperature that can not only reduce desulfurizing tower 8 reduces desulfurization water consumption, and Cryogenic air preheating can be improved
The entering air temperature of device 5 reduces heat transfer loss, while can effectively improve the problem of the escaping of ammonia causes air preheater to block, from
And realize " two-win ".
It further, further include the high temperature bypass valve 11 being set on high temperature bypass flue 10.In order to make to water temperature
The fume afterheat of degree, 3 inlet flue gas temperature of SCR denitration system and high temperature bypass flue 10 can pass through tune using optimizing in operation
The aperture and feed pump 17 for saving high temperature bypass valve 11 export feedwater flow and are achieved.
Further, further include low temperature bypass valve 15 on low temperature bypass flue 14, in order to make removing for electric precipitator 6
The fume afterheat of dirt efficiency and low temperature bypass flue 14, in operation can be by adjusting low temperature bypass valve 15 using optimizing
The flow of 19 condensed water of aperture and low-pressure heater be achieved.
Claims (4)
1. a kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system, the flue collector including boiler (24)
(1) and chimney (9), the flue gas in the flue collector (1) successively passes through level-one high-pressure economizer (2), SCR flue gas denitrification system
(3), high-temperature air preheater (4), low-temperature air preheater (5), electric precipitator (6), a grade low-temp cigarette water- to-water heat exchanger (7), de-
Sulphur tower (8) and chimney (9), which is characterized in that further include:
High temperature bypass flue (10), input end are connected between SCR flue gas denitrification system (3) and high-temperature air preheater (4)
Flue collector (1) in, outlet end is connected to the flue collector between high-temperature air preheater (4) and low-temperature air preheater (5)
(1) in, second level high-pressure economizer (12) and high temperature cigarette are set gradually along flow of flue gas direction in the high temperature bypass flue (10)
Water- to-water heat exchanger (13), the second level high-pressure economizer (12) and level-one high-pressure economizer (2) arranged in series, second level high-pressure economizer
(12) water inlet pipe is connected to the outlet pipe of high-pressure heater (18), outlet pipe be connected to level-one high-pressure economizer (2) into
The water inlet pipe of water pipe, the high temperature cigarette water- to-water heat exchanger (13) is connected to the outlet of feed pump (17), and outlet pipe is connected to two
The water inlet pipe of grade high-pressure economizer (12)；
Low temperature bypass flue (14), input end are connected between high-temperature air preheater (4) and low-temperature air preheater (5)
In flue collector (1), outlet end is connected in the flue collector (1) between low-temperature air preheater (5) and electric precipitator (6), institute
It states and is disposed with two grade low-temp cigarette water- to-water heat exchangers (16) in low temperature bypass flue (14), the two grade low-temps cigarette water- to-water heat exchanger (16)
Water inlet pipe is connected to the condensate pipe of low-pressure heater (19), and outlet pipe is connected to oxygen-eliminating device (20) inlet tube.
2. Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system according to claim 1, special
Sign is: further including air-water heat exchanger (22), the air-water heat exchanger (22) is set to going out for the pressure fan (21) of boiler (24)
In air duct between mouth and low-temperature air preheater (5)；The air-water heat exchanger (22) and a grade low-temp cigarette water- to-water heat exchanger (7) are logical
It crosses water circulating pump (23) and carries out enclosed water circulation heat exchange.
3. Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system according to claim 1, special
Sign is: further including the high temperature bypass valve (11) being set on high temperature bypass flue (10).
4. Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system according to claim 1, special
Sign is: further including the low temperature bypass valve (15) being set on low temperature bypass flue (14).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710541211.XA CN107366897B (en) | 2017-07-05 | 2017-07-05 | A kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710541211.XA CN107366897B (en) | 2017-07-05 | 2017-07-05 | A kind of Pollutant in Coal Burning Boiler emission reduction optimization collaboration fume afterheat deep exploitation system |
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| CN107366897A CN107366897A (en) | 2017-11-21 |
| CN107366897B true CN107366897B (en) | 2019-03-26 |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108730952A (en) * | 2018-08-09 | 2018-11-02 | 哈尔滨锅炉厂有限责任公司 | For flue series arrangement before and after generating plant pulverized coal boiler economizer |
| CN109724099B (en) * | 2019-01-30 | 2024-11-26 | 江苏罗奈德流体科技有限公司 | A boiler flue gas dewhitening process and device |
| CN110686405A (en) * | 2019-08-09 | 2020-01-14 | 上海外高桥第三发电有限责任公司 | A device and method for heating denitrification pyrolysis furnace air using regenerative heat |
| CN112128732B (en) * | 2020-09-03 | 2022-06-10 | 中国能源建设集团江苏省电力设计院有限公司 | Waste steam and flue gas waste heat energy quality coupling and improving system |
| CN113915633A (en) * | 2021-11-17 | 2022-01-11 | 西安热工研究院有限公司 | System for adjusting SCR inlet smoke temperature and control method |
| CN116293636A (en) * | 2023-02-27 | 2023-06-23 | 杭州蕴泽环境科技有限公司 | System and method for recycling waste heat from boiler flue gas exhaust |
| CN116351221A (en) * | 2023-03-13 | 2023-06-30 | 新疆天富环保科技有限公司 | System and method for recycling flue gas waste heat in ammonia desulfurization process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102330967A (en) * | 2011-10-24 | 2012-01-25 | 中国电力工程顾问集团华东电力设计院 | Flue gas energy cascade utilization system |
| CN103062754B (en) * | 2012-12-28 | 2014-08-20 | 华北电力大学 | Power station machine furnace integrated cold end comprehensive optimization system |
| CN105318313B (en) * | 2015-04-29 | 2018-05-18 | 太原理工大学 | A kind of smoke waste heat utilization system based on SCR denitration device |
| CN105371291A (en) * | 2015-11-09 | 2016-03-02 | 华电电力科学研究院 | System capable of utilizing smoke waste heat in gradient mode for assisting in removing SO3 and improving dust removing efficiency |
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