CN207748984U - The system of smoke discharging residual heat evaporation desulfurization wastewater is utilized under running on the lower load - Google Patents
The system of smoke discharging residual heat evaporation desulfurization wastewater is utilized under running on the lower load Download PDFInfo
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- CN207748984U CN207748984U CN201721863718.9U CN201721863718U CN207748984U CN 207748984 U CN207748984 U CN 207748984U CN 201721863718 U CN201721863718 U CN 201721863718U CN 207748984 U CN207748984 U CN 207748984U
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- flue
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- desulfurization wastewater
- economizer
- air preheater
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Abstract
The utility model is related to a kind of to utilize the system of smoke discharging residual heat evaporation desulfurization wastewater under coal-burning power plant's running on the lower load.The system comprises economizer gas bypass subsystems and desulfurization wastewater high-temperature flue to bypass evaporative subsystem.The economizer gas bypass subsystem includes economizer bypass flue.The desulfurization wastewater high-temperature flue bypass evaporative subsystem includes by the sequentially connected softening pond of waste pipe, enrichment facility, waste water pump, waste water preheater and twin injector, and softening pond connects desulfurizing tower；Further include air preheater bypass flue, the air preheater bypass flue is equipped with evaporator, and the inner tip in evaporator is arranged in the twin injector.Unit capacity usage ratio can be improved in the utility model, and realizes the zero-emission of waste water.
Description
Technical field
The utility model is related to a kind of to be using what smoke discharging residual heat evaporated desulfurization wastewater under coal-burning power plant's running on the lower load
System, which can be improved unit capacity usage ratio, and realize the zero-emission of waste water, belong to thermal power generation energy-saving and emission-reduction field.
Background technology
In recent years, domestic coal unit peak regulation arduous task, most units are chronically at underrun state.Load
The decline for resulting in exhaust gas temperature is reduced, when economizer exit flue-gas temperature is too low, the efficiency of SCR denitration device will be big
Width reduces, or even whole out of service, and the concentration of flue gas nitrogen oxide will be unable to the requirement for reaching national minimum discharge.Economizer
Gas bypass technology is to promote one of the important method of unit underload denitration efficiency, and principle is that setting is in parallel with economizer
Gas bypass, from economizer before flue collector draw partial fume and directly import flue collector after economizer, due to water supply and
Heat exchange amount of the flue gas in economizer reduces, and the input gas temperature of SCR denitration device is improved, it is ensured that unit is low negative
Denitration efficiency under lotus operating mode.However, the rising of flue-gas temperature also results in the increase of boiler exhaust gas heat loss, system is reduced
Capacity usage ratio.
High-temperature flue bypass evaporation technique is one of the technical way for realizing Desulphurization for Coal-fired Power Plant wastewater zero discharge,
Principle is the setting flue duct bypass and waste water evaporator in parallel with air preheater, and drawing part high-temperature flue gas from air preheater inlet enters
Bypass and evaporator, while by desulfurization wastewater atomized spray in evaporator, using high-temperature flue gas waste heat by moisture evaporation.Due to
High-temperature flue gas before the technology need to draw air preheater evaporates heat source as waste water, so boiler inlet temperature and efficiency can be reduced.
When unit load down is run, exhaust gas temperature reduces, and in order to ensure the evaporation of desulfurization wastewater, need to draw more high-temperature flue gas
Into bypass flue, lead to further decreasing for boiler inlet temperature and efficiency.If SCR denitration under running on the lower load can be improved to fill
The temperature of exiting flue gas is set, then can reduce waste water and evaporate the high-temperature flue gas amount that need to be consumed, promote boiler inlet temperature and efficiency.
In conclusion when unit load down is run, due to the reduction of flue-gas temperature, desulfurization wastewater needs to consume more
High-temperature flue gas ability evaporating completely, can reduce boiler efficiency；Economizer gas bypass technology is while promoting denitration effect
Flue-gas temperature is improved, boiler exhaust gas heat loss is increased.If the part heat loss due to exhaust gas can be evaporated for desulfurization wastewater,
Wastewater zero discharge not only may be implemented, can more reduce system energy consumption.
Utility model content
It is steamed using smoke discharging residual heat under coal-burning power plant's running on the lower load to solve the above problems, the utility model provides one kind
The system for sending out desulfurization wastewater, the system include economizer gas bypass subsystem and desulfurization wastewater high-temperature flue bypass evaporation subsystem
System can efficiently utilize unit smoke discharging residual heat to realize the zero-emission of waste water under unit running on the lower load.Wherein, by economizer flue gas
Subsystems can promote unit underload denitration efficiency and exhaust gas temperature, reduce demand of the desulfurization wastewater evaporation to high-temperature flue gas
Amount；Desulfurization wastewater high-temperature flue bypass evaporative subsystem can soften waste water, concentrate decrement and preheating etc., its evaporation is reduced
Demand of the process to thermal energy, and realize wastewater zero discharge.
In order to achieve the above object, the specific technical solution of the utility model use is：
Using the system of smoke discharging residual heat evaporation desulfurization wastewater under a kind of running on the lower load, including：Including by flue successively
Boiler, economizer, SCR denitration device, air preheater, electric precipitator and the desulfurizing tower of connection further include economizer gas bypass
System and desulfurization wastewater high-temperature flue bypass evaporative subsystem；Wherein,
The economizer gas bypass subsystem includes economizer bypass flue；
Desulfurization wastewater high-temperature flue bypass evaporative subsystem includes by the sequentially connected softening pond of waste pipe, dense
Compression apparatus, waste water pump, waste water preheater and twin injector, wherein described softening pond one end is connected by waste pipe
The desulfurizing tower is connect, the waste water preheater is installed in the flue between electric precipitator and desulfurizing tower；
The desulfurization wastewater high-temperature flue bypass evaporative subsystem further includes air preheater bypass flue, the economizer bypass
Flue entrance is connect with the flue collector before economizer, and the economizer bypass flue baffle of aperture is adjusted in junction setting, described
The outlet of economizer bypass flue and the flue collector after economizer connect；The air preheater bypass flue is equipped with evaporator, institute
It states twin injector and inner tip in evaporator is set.
Further, the flue between air preheater bypass flue one end connection SCR denitration device and air preheater, connection
Place is equipped with air preheater bypass flue baffle；Cigarette between the air preheater bypass flue other end connection air preheater and electric precipitator
Road.
Further, air compressor is additionally provided with outside the evaporator, the twin injector is compressed with air
Machine communicates.
Further, the enrichment facility uses principle of reverse osmosis, and desulfurization wastewater is filtered into high-concentration waste water and clear water,
The enrichment facility is further connected with fresh water pipeline.
Further, the air preheater bypass flue is entered by the top of evaporator, is drawn from the lower part of evaporator.
Further, the evaporator bottom end is further connected with clinker pipeline.
The beneficial effects of the utility model are：
1. improving the exhaust gas temperature under unit running on the lower load, provides and stablize and sufficient heat for desulfurization wastewater evaporation
Source, and waste water is preheated using the waste heat of flue gas between electric precipitator and desulfurizing tower, realizing the same of wastewater zero discharge
When improve system capacity effective rate of utilization；
2. improving the temperature of flue gas before air preheater, reduces desulfurization wastewater under running on the lower load and evaporate to high-temperature flue gas
Demand, alleviate by load reduction and waste water evaporation caused by boiler inlet temperature decline, improve boiler efficiency；
3. improving the temperature of SCR denitration device import flue gas, the denitration efficiency of unit in low- load conditions is improved；
4. the evaporation of desulfurization wastewater increases smoke moisture, be conducive to the reunion of flue gas tiny particles content, reduce tiny
The discharge of particulate matter；
5. Waste water concentrating produces part clear water, water resource has been saved.
Description of the drawings
Fig. 1 is the system structure diagram described in the utility model that desulfurization wastewater is evaporated using smoke discharging residual heat；
Wherein, 1- boilers, 2- economizers, 3-SCR denitrification apparatus, 4- air preheaters, 5- electric precipitators, 6- desulfurizing towers, 7- are soft
Change pond, 8- enrichment facilities, 9- waste water pumps, 10- waste water preheaters, 11- air compressors, 12- twin injectors, 13-
Evaporator, 14- economizer bypass flues, 15- economizer bypass flue baffles, 16- flue collectors, 17- waste pipes, 18- clear water
Pipeline, 19- air preheater bypass flues, 20- air preheater bypass flue baffles, 21- clinker pipelines, 22- feedwater pipings.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only explaining this
Utility model is not used to limit the utility model.
Using the system of smoke discharging residual heat evaporation desulfurization wastewater under a kind of running on the lower load, as shown in Figure 1, including：Including logical
Cross the sequentially connected boiler 1 of flue, economizer 2, SCR denitration device 3, air preheater 4, electric precipitator 5 and desulfurizing tower 6, feature
It is, further includes economizer gas bypass subsystem and desulfurization wastewater high-temperature flue bypass evaporative subsystem；Wherein,
The economizer gas bypass subsystem includes economizer bypass flue 14；14 entrance of economizer bypass flue
The flue collector 16 between boiler 1 and economizer 2 is connected, the economizer bypass flue baffle 15 of aperture is adjusted in junction setting,
The flue collector of outlet the connection economizer 2 and SCR denitration device 3 of the economizer bypass flue 14.
The desulfurization wastewater high-temperature flue bypass evaporative subsystem includes passing through 17 sequentially connected softening pond of waste pipe
7, enrichment facility 8, waste water pump 9, waste water preheater 10 and twin injector 12, wherein described 7 one end of softening pond passes through
Waste pipe 17 connects the desulfurizing tower 6, and the waste water preheater 10 is installed on the flue between electric precipitator 5 and desulfurizing tower 6
It is interior.
Desulfurization wastewater high-temperature flue bypass evaporative subsystem further includes air preheater bypass flue 19, by the air preheater
Flue 19 one end in road connects the flue between SCR denitration device 3 and air preheater 4, and junction is equipped with the air preheater of adjustable aperture
Bypass flue baffle 20, the flue between 19 other end of the air preheater bypass flue connection air preheater 4 and electric precipitator 5；Institute
It states air preheater bypass flue 19 and is equipped with evaporator 13, the twin injector 12 is arranged on the inside of evaporator 13 top
End.It is additionally provided with air compressor 11 outside the evaporator 13, the twin injector 12 is communicated with air compressor 11,
Air compressor 11 can provide the compressed air that pressure is about 0.4-0.8MPa to twin injector 12.The evaporator
13 bottom ends are further connected with clinker pipeline 21.
The enrichment facility 8 uses principle of reverse osmosis, and desulfurization wastewater is filtered into high-concentration waste water and clear water, the concentration
Device 8 is further connected with fresh water pipeline 18.
Desulfurization wastewater zero-emission under running on the lower load is realized based on the system for evaporating desulfurization wastewater using smoke discharging residual heat
The method put, includes the following steps：
Step 1, when unit load reduces, economizer bypass flue baffle 15 is opened, is adjusted by control baffle aperture
Flue gas enters the flow of economizer bypass flue 14, make the entrance flue gas temperature of SCR denitration device 3 be maintained at 320-420 DEG C it
Between (specific aperture adjustment mode need to be directed to unit concrete condition calculate), it is ensured that 3 Effec-tive Function of SCR denitration device；
Step 2, desulfurization wastewater enters softening pond 7 by desulfurizing tower 6, and white lime (or caustic soda) and pure is added into softening pond 7
Alkali etc. softens medicament, removes magnesium ion and calcium ion in waste water, and waste water hardness is adjusted in 150mg/L or less (with calcium carbonate
Meter), obtain softening waste water；
Step 3, the softening waste water enters enrichment facility 8, by reverse osmosis membrane filtration therein be high-concentration waste water and
Clear water, clear water are discharged through fresh water pipeline 18 and recycle；Wherein, high-concentration waste water accounts for the 50%-70% of waste water total amount；
Step 4, the high-concentration waste water enters waste water preheater 10 through waste water pump 9, with electric precipitator 5 and desulfurizing tower 6 it
Between flue gas fully exchanged heat, the high-concentration waste coolant-temperature gage promotes 40-70 DEG C；
Step 5, the high-concentration waste water after preheating enters two-fluid mist jointly with the pressure-air from air compressor 11
Change injector 12, the drop that it is 40-100 μm for average grain diameter that waste water, which is atomized, and is sprayed in evaporator 13 along flue gas flow direction
Internal top；
Step 6, air preheater bypass flue baffle 20 is opened, air preheater bypass flue 19 is adjusted by controlling its aperture
Flue gas flow, it is ensured that its thermal energy maintains the evaporation of current desulfurization wastewater enough, and (specific control mode need to be directed to the specific feelings of unit
Condition calculates)；
Step 7, the part high-temperature flue gas before air preheater 4 enters through the air preheater bypass flue 19 on evaporator 13
Portion fully exchanges heat and is evaporated with atomization waste water, and most of solid particulate matter of generation is with flue gas by the lower part of evaporator 13
The flue collector after air preheater 4 is drained into, is captured into electric precipitator 5；Remaining solid particulate matter sedimentation generated in evaporator 13
It to 13 bottom of evaporator, is discharged through clinker pipeline 21, completes desulfurization wastewater zero-emission.
The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this
For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model
Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (6)
1. using the system of smoke discharging residual heat evaporation desulfurization wastewater under a kind of running on the lower load, including：Including being connected successively by flue
Boiler (1), economizer (2), SCR denitration device (3), air preheater (4), electric precipitator (5) and the desulfurizing tower (6) connect, feature
It is, further includes economizer gas bypass subsystem and desulfurization wastewater high-temperature flue bypass evaporative subsystem；Wherein,
The economizer gas bypass subsystem includes economizer bypass flue (14)；
The desulfurization wastewater high-temperature flue bypass evaporative subsystem includes passing through the sequentially connected softening pond of waste pipe (17)
(7), enrichment facility (8), waste water pump (9), waste water preheater (10) and twin injector (12), wherein the softening
Pond (7) one end connects the desulfurizing tower (6) by waste pipe (17), and the waste water preheater (10) is installed on electric precipitator
(5) in the flue between desulfurizing tower (6)；
The desulfurization wastewater high-temperature flue bypass evaporative subsystem further includes air preheater bypass flue (19), the air preheater bypass
Flue (19) one end connects the flue between SCR denitration device (3) and air preheater (4), and the air preheater bypass flue (19) is another
One end connects the flue between air preheater (4) and electric precipitator (5)；The air preheater bypass flue (19) is equipped with evaporator
(13), inner tip of twin injector (12) setting in evaporator (13).
2. being existed using the system of smoke discharging residual heat evaporation desulfurization wastewater, feature under running on the lower load according to claim 1
In economizer bypass flue (14) entrance is connect with the flue collector (16) before economizer (2), and junction setting is adjustable to open
The economizer bypass flue baffle (15) of degree, outlet and the flue collector after economizer (2) of the economizer bypass flue (14)
Connection.
3. being existed using the system of smoke discharging residual heat evaporation desulfurization wastewater, feature under running on the lower load according to claim 1
In the air preheater bypass flue (19) and the junction of flue collector before air preheater (4) are equipped with air preheater bypass flue baffle
(20)。
4. being existed using the system of smoke discharging residual heat evaporation desulfurization wastewater, feature under running on the lower load according to claim 1
In the evaporator (13) is additionally provided with air compressor (11), the twin injector (12) and air compressor outside
(11) it communicates.
5. being existed using the system of smoke discharging residual heat evaporation desulfurization wastewater, feature under running on the lower load according to claim 1
In the enrichment facility (8) uses principle of reverse osmosis, and desulfurization wastewater is filtered into high-concentration waste water and clear water, the concentration dress
It sets (8) and is further connected with fresh water pipeline (18).
6. being existed using the system of smoke discharging residual heat evaporation desulfurization wastewater, feature under running on the lower load according to claim 1
In the air preheater bypass flue (19) is entered by the top of evaporator (13), is drawn from the lower part of evaporator (13)；The steaming
Hair device (13) bottom end is further connected with clinker pipeline (21).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721863718.9U CN207748984U (en) | 2017-12-27 | 2017-12-27 | The system of smoke discharging residual heat evaporation desulfurization wastewater is utilized under running on the lower load |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721863718.9U CN207748984U (en) | 2017-12-27 | 2017-12-27 | The system of smoke discharging residual heat evaporation desulfurization wastewater is utilized under running on the lower load |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107935292A (en) * | 2017-12-27 | 2018-04-20 | 大唐环境产业集团股份有限公司 | The system and method for smoke discharging residual heat evaporation desulfurization wastewater are utilized under running on the lower load |
| WO2020108135A1 (en) * | 2018-11-29 | 2020-06-04 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Desulfurization wastewater treatment system and desulfurization wastewater treatment method |
-
2017
- 2017-12-27 CN CN201721863718.9U patent/CN207748984U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107935292A (en) * | 2017-12-27 | 2018-04-20 | 大唐环境产业集团股份有限公司 | The system and method for smoke discharging residual heat evaporation desulfurization wastewater are utilized under running on the lower load |
| WO2020108135A1 (en) * | 2018-11-29 | 2020-06-04 | 国家电投集团远达环保工程有限公司重庆科技分公司 | Desulfurization wastewater treatment system and desulfurization wastewater treatment method |
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