CN207748983U - A kind of desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN - Google Patents
A kind of desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN Download PDFInfo
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- CN207748983U CN207748983U CN201721863712.1U CN201721863712U CN207748983U CN 207748983 U CN207748983 U CN 207748983U CN 201721863712 U CN201721863712 U CN 201721863712U CN 207748983 U CN207748983 U CN 207748983U
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Abstract
The utility model is related to a kind of desulfurization wastewater Zero discharging systems of wide load denitration and UTILIZATION OF VESIDUAL HEAT IN, belong to thermal power generation energy-saving and emission-reduction field.The system comprises pass through the sequentially connected boiler of flue collector, economizer, SCR denitration device, air preheater, electric precipitator and desulfurizing tower；The steam turbine being connect with boiler by main steam line；No.1 height No. zero height of adduction is equipped on the feedwater piping successively to add；Further include water supply backheat subsystem and air preheater bypass flue evaporative subsystem.The utility model can be under a variety of running on the lower load of unit, by improving exhaust gas temperature, while realizing that denitration carries effect, desulfurization wastewater zero-emission and fume afterheat and utilizes.
Description
Technical field
The utility model is related to a kind of desulfurization wastewater Zero discharging systems of wide load denitration and UTILIZATION OF VESIDUAL HEAT IN, can be more in unit
System denitration efficiency is improved under kind running on the lower load, while efficiently using the zero-emission that smoke discharging residual heat realizes desulfurization wastewater, is belonged 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, SCR denitration device will be greatly reduced
Efficiency, or even it is forced out of service, the concentration of flue gas nitrogen oxide will be unable to the requirement for reaching national minimum discharge.By to vapour
Turbine heat regenerative system is targetedly transformed, and the heat content of economizer import water supply can be improved, and reduces flue gas and water supply is saving
It is de- under a variety of running on the lower load to promote it to improve the input gas temperature of SCR denitration device for heat exchange amount in coal device
Nitre efficiency.However, the rising of flue-gas temperature also results in the increase of boiler exhaust gas heat loss, system capacity utilization rate is reduced.
Air preheater bypass flue evaporation technique is one of the technical way for realizing Desulphurization for Coal-fired Power Plant wastewater zero discharge,
Its principle is the setting flue duct bypass in parallel with air preheater, and evaporator is arranged in bypass, draws part height from air preheater inlet
Warm flue gas enters bypass, while by desulfurization wastewater atomized spray in evaporator, using high-temperature flue gas waste heat by moisture evaporation.By
Heat source is evaporated by waste water of the high-temperature flue gas before air preheater in the technology, so boiler inlet temperature and boiler effect can be reduced
Rate.When unit load down is run, exhaust gas temperature reduces, and in order to ensure the evaporation of desulfurization wastewater, need to draw more flue gases
Into air preheater bypass flue, lead to further decreasing for boiler inlet temperature and efficiency.If SCR under running on the lower load can be improved
The temperature of denitration outlet flue gas can then reduce waste water evaporation to the demand of flue gas, improve boiler inlet temperature and effect
Rate.
Utility model content
To solve the above problems, the utility model provides a kind of desulfurization wastewater zero-emission of wide load denitration and UTILIZATION OF VESIDUAL HEAT IN
System.The utility model has combined water supply backheat subsystem and desulfurization wastewater air preheater bypass flue evaporative subsystem, can be in machine
NO_x Reduction by Effective is realized under the wide load condition of group, while the zero-emission of waste water is realized using unit smoke discharging residual heat.Wherein, water supply backheat
Subsystem can promote unit underload denitration efficiency and exhaust gas temperature；Desulfurization wastewater air preheater bypass flue evaporative subsystem can be right
Waste water is softened, is concentrated, is preheated, is atomized and evaporated, and is improved waste water evaporation efficiency and is realized wastewater zero discharge.
To achieve the goals above, the specific technical solution of the utility model use is：
A kind of desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN, including it is sequentially connected by flue collector
Boiler, economizer, SCR denitration device, air preheater, electric precipitator, desulfurizing tower, wherein the economizer connects feedwater piping, institute
It states and adds successively equipped with No.1 height No. zero height of adduction on feedwater piping；It further include the steamer being connect with boiler by main steam line
Machine；Further include water supply backheat subsystem and air preheater bypass flue evaporative subsystem；
The water supply backheat subsystem includes jetting steam caused pipeline, by jetting steam caused pipeline and injector, and the injection steams
Steam pipe road and the import that injector is separately connected by the outlet of jetting steam caused pipeline, the jetting steam caused pipeline connect boiler, institute
It states and steam turbine is connected by one section of extraction line of steam turbine by jetting steam caused pipeline；The outlet of the injector passes through mixed vapour
Pipeline connects No. zero height and adds；
The air preheater bypass flue evaporative subsystem includes by the sequentially connected Softening box of waste pipe, reverse osmosis dress
It sets, waste water preheater, waste water pump and spray nozzle；Wherein, the Softening box is connected by waste pipe with desulfurizing tower；Also wrap
Air preheater bypass flue is included, the entrance of the air preheater bypass flue and the flue collector before air preheater connect, by the air preheater
The outlet of road flue and the flue collector after air preheater connect；Evaporator, the atomization are installed on the air preheater bypass flue
Injector is installed on evaporator inner tip.
Further, the division pendant superheater outlet of the entrance connection boiler of the jetting steam caused pipeline, the injection steam
The jetting steam caused import of the outlet connection injector in steam pipe road；Being passed through by jetting steam caused import for the injector is jetting steam caused
One section of extraction line of pipeline and steam turbine is connected；The entrance of one section of extraction line of the steam turbine and the high pressure cylinder of steam turbine connect
It connects, the outlet of one section of extraction line of the steam turbine adds with No.1 height simultaneously to be connected.
Further, No. zero height is additionally provided with No. zero HP heater drainage in parallel with feedwater piping between summing it up No.1 height in addition
Pipeline.
Further, the jetting steam caused pipeline and be respectively equipped on jetting steam caused pipeline adjustable aperture injection steam
Vapour pipeline valve and by jetting steam caused pipeline valve.
Further, the flue collector between the entrance connection SCR denitration device and air preheater of air preheater bypass flue, connection
Bypass gas baffle of the place equipped with adjustable opening；Between the outlet connection air preheater and electric precipitator of the air preheater bypass flue
Flue collector.
Further, desulfurization wastewater is filtered into high-concentration waste water and clear water by the reverse osmosis unit, and described reverse osmosis
Device is connected to fresh water pipeline discharge clear water.
Further, the waste water preheater is installed in the flue collector between electric precipitator and desulfurizing tower.
Further, the air preheater bypass flue enters from the top of evaporator, is drawn from the lower part of evaporator.
The beneficial effects of the utility model are：
1. under a variety of running on the lower load of unit (40%THA or more), by improving exhaust gas temperature, realize simultaneously
Denitration carries effect, desulfurization wastewater zero-emission and fume afterheat and utilizes；
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 or counteract by load reduction and waste water evaporation caused by boiler inlet temperature decline, to a certain degree
On improve energy utilization efficiency；
3. pair desulfurization wastewater has carried out decrement, preheating and atomization, its evaporation efficiency 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 structural representation of the desulfurization wastewater Zero discharging system of wide load denitration described in the utility model and UTILIZATION OF VESIDUAL HEAT IN
Figure；
In figure, 1- boilers, 2- economizers, 3-SCR denitrification apparatus, 4- air preheaters, 5- electric precipitators, 6- desulfurizing towers, 7- is soft
Change case, 8- reverse osmosis units, 9- waste water preheaters, 10- waste water pumps, 11- spray nozzles, 12- evaporators, 13- waste pipes,
14- bypass flue baffles, 15- air preheater bypass flues, 16- flue collectors, 17- main steam lines, 18- steam turbines, 19- No.1s are high
Add, No. zero height of 20- adds, and 21- feedwater pipings, the jetting steam caused pipelines of 22-, the jetting steam caused pipeline valves of 23-, 24- is by jetting steam caused pipe
Road, 25- is by jetting steam caused pipeline valve, 26- injectors, 27- mixed vapour pipelines, one section of extraction line of 28- steam turbines, 34- zero
Number HP heater drainage pipeline, 35- fresh water pipelines.
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.
As shown in Figure 1, a kind of desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN, including pass through flue collector
16 sequentially connected boilers 1, economizer 2, SCR denitration device 3, air preheater 4, electric precipitator 5, desulfurizing tower 6, wherein province's coal
Device 2 connects feedwater piping 21, on the feedwater piping 21 successively equipped with No.1 height add 19 and No. zero height add 20, No. zero height adds
20 and No.1 height add and be additionally provided with No. zero HP heater drainage pipeline 34 in parallel with feedwater piping between 19.The desulfurization wastewater zero-emission
System further includes the steam turbine 18 being connect with boiler by main steam line 17；It additionally includes water supply backheat subsystem and sky is pre-
Device bypass flue evaporative subsystem.
The water supply backheat subsystem includes jetting steam caused pipeline 22, by jetting steam caused pipeline 24 and injector 26, described
Jetting steam caused pipeline 22 and the import that injector 26 is separately connected by the outlet of jetting steam caused pipeline 24, the jetting steam caused pipeline
22 connection boilers 1, it is described that steam turbine 18 is connected by one section of extraction line 28 of steam turbine by jetting steam caused pipeline 24；The injection
The outlet of device 26 connects No. zero height by mixed vapour pipeline 27 and adds 20.Specifically, the entrance of the jetting steam caused pipeline 22 connects
Connect the division pendant superheater outlet of boiler 1, the jetting steam caused import of the outlet connection injector 26 of the jetting steam caused pipeline 22；
The injector 26 by jetting steam caused import by being connected by one section of extraction line 28 of jetting steam caused pipeline 24 and steam turbine；Institute
The entrance for stating one section of extraction line 28 of steam turbine is connect with the high pressure cylinder of steam turbine 18, one section of extraction line 28 of the steam turbine
Outlet adds 19 to be connected with No.1 height simultaneously.The jetting steam caused pipeline 22 and adjustable by being respectively equipped on jetting steam caused pipeline 24
The jetting steam caused pipeline valve 23 of aperture and by jetting steam caused pipeline valve 25.
The air preheater bypass flue evaporative subsystem includes by 13 sequentially connected Softening box 7 of waste pipe, reverse osmosis
Saturating device 8, waste water preheater 9, waste water pump 10 and spray nozzle 11；Wherein, the Softening box 7 by waste pipe 13 and takes off
Sulphur tower 6 is connected；The waste water preheater 9 is installed in the flue collector between electric precipitator 5 and desulfurizing tower 6.It further include air preheater
The entrance of bypass flue 15, the air preheater bypass flue 15 is connect with the flue collector before air preheater 4, and the air preheater bypasses cigarette
The outlet in road 15 is connect with the flue collector after air preheater 4；Evaporator 12, the mist are installed on the air preheater bypass flue 15
Change injector 11 and is installed on 12 inner tip of evaporator.The air preheater bypass flue 15 enters from the top of evaporator 12, from
It draws the lower part of evaporator 12.
Flue collector between the entrance connection SCR denitration device 3 and air preheater 4 of air preheater bypass flue 15, junction is set
There is the bypass gas baffle 14 of adjustable opening；Outlet connection air preheater 4 and the electric precipitator 5 of the air preheater bypass flue 15 it
Between flue collector.
Desulfurization wastewater is filtered into high-concentration waste water and clear water by the reverse osmosis unit 8, and the reverse osmosis unit 8 is connected to
Clear water is discharged in fresh water pipeline 35.
The wide load denitration of unit is realized based on the desulfurization wastewater Zero discharging system of the wide load denitration and UTILIZATION OF VESIDUAL HEAT IN
With the method for the desulfurization wastewater zero-emission of UTILIZATION OF VESIDUAL HEAT IN, include the following steps：
Step 1, it when unit load reduces, opens jetting steam caused pipeline valve and by jetting steam caused pipeline valve, passes through adjusting
Respective aperture controls steam flow；Jetting steam caused from boiler separating panel superheater outlet enters spray by jetting steam caused pipeline
Emitter, the one section of steam extraction of injection steam turbine, one section of steam extraction of steam turbine by jetting steam caused pipeline by entering injector；The injection steams
It vapour and is mixed in injector by jetting steam caused, is added into No. zero height by mixed vapour pipeline, what heating added from No.1 height
Water supply, the hydrophobic of generation enter No.1 height by No. zero HP heater drainage pipeline and add.
Step 2, add the water supply of outlet to be heated by feedwater piping in No. zero Gao Jianei from No.1 height and enter province's coal
Device, economizer import feed temperature are enhanced, and wherein the heat exchange amount of flue gas and water supply is reduced, the flue gas of SCR denitration device import
Temperature is raised to 320-420 DEG C, ensures that the denitration efficiency under the wide loading condiction of unit can stably reach 80% or more；SCR is de-
The flue-gas temperature of nitre device outlet is also increased to 320 DEG C or more, is provided for the evaporation of desulfurization wastewater in low- load conditions
Heat source that is sufficient and stablizing.
Step 3, desulfurization wastewater enters Softening box, reduces the hardness to 200mg/L (with calcium carbonate) hereinafter, preventing from easing up
Solve desulfurization wastewater fouling and blocking in reverse osmosis unit.
Step 4, the desulfurization wastewater after softening enters reverse osmosis unit, and high-concentration waste water is filtered by reverse osmosis membrane group
And clear water, wherein high-concentration waste water enter waste water preheater, clear water is utilized again by fresh water pipeline discharge；Desulfurization wastewater simultaneously
The heat that discharge reduction, preheating and evaporation need is reduced；
Step 5, it exchanges heat into the flue gas between the high-concentration waste water and electric precipitator, desulfurizing tower of waste water preheater,
High-concentration waste coolant-temperature gage is improved to the heat demand that its evaporation is further reduced to 80-100 DEG C；
Step 6, the waste water after being heated by the waste water preheater enters spray nozzle through waste water pump, and it is average to be atomized
The drop that grain size is 30-100 μm, spurts into evaporator；
Step 7, the bypass flue baffle is opened, the flue gas of air preheater bypass flue is entered by adjusting the control of its aperture
Flow (specific regulative mode need to be calculated according to unit carrying out practically situation), flue gas enter from upper end of evaporator, useless with atomization
Water comes into full contact with and by its rapid evaporation, and the vapor and particulate matter that evaporate generation are discharged with flue gas from the bottom of evaporator, most
It is captured eventually into electric precipitator, realizes the zero-emission of desulfurization wastewater.
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 (8)
1. a kind of desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN, including be sequentially connected by flue collector (16)
Boiler (1), economizer (2), SCR denitration device (3), air preheater (4), electric precipitator (5), desulfurizing tower (6), wherein the province
Coal device (2) connects feedwater piping (21), adds (19) and No. zero height to add (20) equipped with No.1 height successively on the feedwater piping (21)；
It further include the steam turbine (18) being connect with boiler by main steam line (17)；It is characterized in that, further including water supply backheat subsystem
System and air preheater bypass flue evaporative subsystem；
The water supply backheat subsystem includes jetting steam caused pipeline (22), by jetting steam caused pipeline (24) and injector (26), institute
It states jetting steam caused pipeline (22) and is separately connected the import of injector (26), the injection by the outlet of jetting steam caused pipeline (24)
Jet chimney (22) connects boiler (1), described to pass through one section of extraction line (28) connection of steam turbine by jetting steam caused pipeline (24)
Steam turbine (18)；The outlet of the injector (26) connects No. zero height by mixed vapour pipeline (27) and adds (20)；
The air preheater bypass flue evaporative subsystem includes by waste pipe (13) sequentially connected Softening box (7), reverse osmosis
Saturating device (8), waste water preheater (9), waste water pump (10) and spray nozzle (11)；Wherein, the Softening box (7) passes through waste water
Pipeline (13) is connected with desulfurizing tower (6)；Further include air preheater bypass flue (15), the entrance of the air preheater bypass flue (15)
It is connect with the flue collector before air preheater (4), outlet and the flue collector after air preheater (4) of the air preheater bypass flue (15) connect
It connects；Evaporator (12) is installed, the spray nozzle (11) is installed on evaporator on the air preheater bypass flue (15)
(12) inner tip.
2. the desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN according to claim 1, which is characterized in that
The division pendant superheater outlet of the entrance connection boiler (1) of the jetting steam caused pipeline (22), the jetting steam caused pipeline (22)
Outlet connection injector (26) jetting steam caused import；The injector (26) by jetting steam caused import by being steamed by injection
The one section of extraction line (28) in steam pipe road (24) and steam turbine is connected；The entrance and steamer of one section of extraction line (28) of the steam turbine
The high pressure cylinder of machine (18) connects, and the outlet of one section of extraction line (28) of the steam turbine adds (19) to be connected with No.1 height simultaneously.
3. the desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN according to claim 1, which is characterized in that
No. zero height is additionally provided with No. zero HP heater drainage pipeline (34) in parallel with feedwater piping between adding (20) and No.1 height to add (19).
4. the desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN according to claim 1, which is characterized in that
The jetting steam caused pipeline (22) and the jetting steam caused pipe that adjustable aperture is respectively equipped on jetting steam caused pipeline (24)
Road valve (23) and by jetting steam caused pipeline valve (25).
5. the desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN according to claim 1, which is characterized in that
Flue collector between the entrance connection SCR denitration device (3) and air preheater (4) of air preheater bypass flue (15), junction is equipped with
The bypass gas baffle (14) of adjustable opening；The outlet connection air preheater (4) and electric precipitation of the air preheater bypass flue (15)
Flue collector between device (5).
6. the desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN according to claim 1, which is characterized in that
Desulfurization wastewater is filtered into high-concentration waste water and clear water by the reverse osmosis unit (8), and the reverse osmosis unit (8) is connected to clear water
Clear water is discharged in pipeline (35).
7. the desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN according to claim 1, which is characterized in that
The waste water preheater (9) is installed in the flue collector between electric precipitator (5) and desulfurizing tower (6).
8. the desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN according to claim 1, which is characterized in that
The air preheater bypass flue (15) enters from the top of evaporator (12), is drawn from the lower part of evaporator (12).
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| CN201721863712.1U CN207748983U (en) | 2017-12-27 | 2017-12-27 | A kind of desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN |
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| CN201721863712.1U CN207748983U (en) | 2017-12-27 | 2017-12-27 | A kind of desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108128956A (en) * | 2017-12-27 | 2018-06-08 | 大唐环境产业集团股份有限公司 | A kind of width load denitration and the desulfurization wastewater Zero discharging system and method for UTILIZATION OF VESIDUAL HEAT IN |
| CN109045980A (en) * | 2018-09-21 | 2018-12-21 | 山西普丽环境工程股份有限公司 | A kind of desulfurization wastewater zero-discharge treatment system based on UTILIZATION OF VESIDUAL HEAT IN |
-
2017
- 2017-12-27 CN CN201721863712.1U patent/CN207748983U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108128956A (en) * | 2017-12-27 | 2018-06-08 | 大唐环境产业集团股份有限公司 | A kind of width load denitration and the desulfurization wastewater Zero discharging system and method for UTILIZATION OF VESIDUAL HEAT IN |
| CN109045980A (en) * | 2018-09-21 | 2018-12-21 | 山西普丽环境工程股份有限公司 | A kind of desulfurization wastewater zero-discharge treatment system based on UTILIZATION OF VESIDUAL HEAT IN |
| CN109045980B (en) * | 2018-09-21 | 2024-02-27 | 山西格盟普丽环境股份有限公司 | Desulfurization wastewater zero release processing system based on waste heat utilization |
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