CN108128956A - A kind of width load denitration and the desulfurization wastewater Zero discharging system and method for UTILIZATION OF VESIDUAL HEAT IN - Google Patents
A kind of width load denitration and the desulfurization wastewater Zero discharging system and method for UTILIZATION OF VESIDUAL HEAT IN Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- 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
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- B01D53/86—Catalytic processes
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/048—Purification of waste water by evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
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- C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The present invention relates to a kind of wide load denitrations and the desulfurization wastewater Zero discharging system and method for 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 by main steam line with boiler；No.1 height No. zero height of adduction is equipped on the feedwater piping successively to add；Further include feedwater backheat subsystem and air preheater bypass flue evaporative subsystem.The invention further relates to a kind of methods that wide load denitration and the desulfurization wastewater zero-emission of UTILIZATION OF VESIDUAL HEAT IN are realized based on the desulfurization wastewater Zero discharging system.The present invention can be under a variety of running on the lower load of unit, by improving exhaust gas temperature, while realize that denitration carries effect, desulfurization wastewater zero-emission and fume afterheat and utilizes.
Description
Technical field
The present invention relates to a kind of wide load denitrations and the desulfurization wastewater Zero discharging system and method for UTILIZATION OF VESIDUAL HEAT IN, can be in unit
System denitration efficiency is improved under a variety of running on the lower load, while efficiently uses the zero-emission that smoke discharging residual heat realizes desulfurization wastewater, is belonged to
In 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 can improve the heat content of economizer import feedwater, reduces flue gas and feedwater is saving
So as to improve the input gas temperature of SCR denitration device, it is de- under a variety of running on the lower load to promote it 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 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 sets evaporator 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 the further reduction of 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 demand of the waste water evaporation to flue gas, improve boiler inlet temperature and effect
Rate.
Invention content
To solve the above problems, the present invention provides the desulfurization wastewater Zero discharging system of a kind of wide load denitration and UTILIZATION OF VESIDUAL HEAT IN
And method.The present invention has combined feedwater backheat subsystem and desulfurization wastewater air preheater bypass flue evaporative subsystem, can be in unit
NO_x Reduction by Effective is realized under wide load condition, while the zero-emission of waste water is realized using unit smoke discharging residual heat.Wherein, feedwater backheat
System can promote unit underload denitration efficiency and exhaust gas temperature；Desulfurization wastewater air preheater bypass flue evaporative subsystem can be to useless
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 these goals, the specific technical solution that uses of the present invention is：
A kind of width load denitration and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, including 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；Further include the steamer being connect by main steam line with boiler
Machine；Further include feedwater backheat subsystem and air preheater bypass flue evaporative subsystem；
The feedwater backheat subsystem includes jetting steam caused pipeline, by jetting steam caused pipeline and injector, and the injection steams
Steam pipe road and the import for being connected injector respectively by the outlet of jetting steam caused pipeline, the jetting steam caused pipeline connection 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；
Or the feedwater backheat subsystem includes high steam pipeline A, the import of the high steam pipeline A and steam turbine
High pressure cylinder be connected, the outlet of the high steam pipeline A connects No. zero height and adds；
Or the feedwater backheat subsystem includes high steam pipeline B, the import of the high steam pipeline B and steam supply pipe
Road is connected, and the outlet of the high steam pipeline B adds with No. zero height to be connected；Wherein, the import of the gas filling pipeline and main steam
Pipeline is connected, and the outlet of the gas filling pipeline is connected with steam turbine；
The air preheater bypass flue evaporative subsystem is included through the sequentially connected Softening box of waste pipe, reverse osmosis dress
It puts, waste water preheater, waste water pump and spray nozzle；Wherein, the Softening box is connected by waste pipe with desulfurizing tower；Also wrap
Include air preheater bypass flue, the flue collector connection before the entrance and air preheater of the air preheater bypass flue, by the air preheater
Flue collector connection behind the outlet of road flue and air preheater；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 described one section of extraction line of steam turbine and the high pressure cylinder of steam turbine connect
It connects, the outlet of one section of extraction line of steam turbine adds simultaneously with No.1 height 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 the jetting steam caused pipeline valve that adjustable aperture is respectively equipped on jetting steam caused pipeline
With by jetting steam caused pipeline valve；
The high steam pipeline A is equipped with the high steam pipeline valve A of adjustable aperture；
The filling regulating valve and high steam of adjustable aperture are respectively equipped on the gas filling pipeline and high steam pipeline B
Pipeline valve B；The junction of the high steam pipeline B and gas filling pipeline is between filling regulating valve and steam turbine.
Further, the flue collector between the entrance connection SCR denitration device of air preheater bypass flue and air preheater, 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 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 control 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 by mixed vapour pipeline into No. zero height, heat what is added from No.1 height
Feedwater, the hydrophobic of generation are added by No. zero HP heater drainage pipeline flow-direction No.1 height；
Or when unit load reduces, high steam pipeline valve A is opened, steam flow is controlled by adjusting aperture, comes from
The high steam of steam turbine is added by high steam pipeline A into No. zero height, heats the feedwater added from No.1 height, and generation is dredged
Water is added by No. zero HP heater drainage pipeline flow-direction No.1 height；
Or when unit load reduces, filling regulating valve and high steam pipeline valve B are opened, is steamed by adjusting aperture control
Steam flow amount, the partial high pressure steam of gas filling pipeline are added by high steam pipeline B into No. zero height, heat what is added from No.1 height
Feedwater, the hydrophobic of generation are added by No. zero HP heater drainage pipeline flow-direction No.1 height；
Step 2, the feedwater of outlet is added to be heated by feedwater piping in No. zero Gao Jianei from No.1 height and enters province's coal
Device, economizer import feed temperature are enhanced, and wherein flue gas and the heat exchange amount of feedwater 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 more than 80%；SCR takes off
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 hereinafter, preventing gentle solution desulfurization wastewater from existing
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 reused 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 of waste water preheater and electric precipitator, desulfurizing tower,
High-concentration waste coolant-temperature gage is improved to the heat demand for 80-100 DEG C, being further reduced its evaporation；
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
Grain size is 30-100 μm of drop, spurts into evaporator；
Step 7, the bypass flue baffle is opened, by adjusting the control of its aperture into the flue gas of air preheater bypass flue
Flow, flue gas enter from upper end of evaporator, are come into full contact with and by its rapid evaporation with atomization waste water, evaporate the vapor of generation
It is discharged with particulate matter with flue gas from the bottom of evaporator, eventually enters into electric precipitator and be captured, realize the zero-emission of desulfurization wastewater.
Beneficial effects of the present invention are：
1. under a variety of running on the lower load of unit (more than 40%THA), 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, reduce desulfurization wastewater under running on the lower load and evaporate to high-temperature flue gas
Demand, alleviate or counteract as 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 knot of the desulfurization wastewater Zero discharging system of wide load denitration and UTILIZATION OF VESIDUAL HEAT IN described in the embodiment of the present invention 1
Structure schematic diagram；
Fig. 2 is the knot of the desulfurization wastewater Zero discharging system of wide load denitration and UTILIZATION OF VESIDUAL HEAT IN described in the embodiment of the present invention 2
Structure schematic diagram.
Fig. 3 is the knot of the desulfurization wastewater Zero discharging system of wide load denitration and UTILIZATION OF VESIDUAL HEAT IN described in the embodiment of the present invention 3
Structure schematic diagram.
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, 29- high
Press jet chimney valve A, 30- high steam pipeline A, 31- filling regulating valve, 32- high steam pipeline valve B, 33- high-pressure steam pipes
No. zero HP heater drainage pipeline of road B, 34-, 35- fresh water pipelines, 36- gas filling pipelines.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not
For limiting the present invention.
Embodiment 1
As shown in Figure 1, the desulfurization wastewater Zero discharging system of a kind of width load denitration and UTILIZATION OF VESIDUAL HEAT IN, including passing 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 No. zero HP heater drainage pipeline 34 in parallel with feedwater piping be additionally provided between 19.The desulfurization wastewater zero-emission
System further includes the steam turbine 18 being connect by main steam line 17 with boiler；It additionally includes feedwater backheat subsystem and sky is pre-
Device bypass flue evaporative subsystem.
The feedwater 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 for being connected injector 26 respectively 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, described one section of extraction line 28 of 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 is included through 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.Further include air preheater
Bypass flue 15, the entrance of the air preheater bypass flue 15 are 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 be 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
Fresh water pipeline 35 discharges clear water.
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 control 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 by mixed vapour pipeline into No. zero height, heat what is added from No.1 height
Feedwater, the hydrophobic of generation are added by No. zero HP heater drainage pipeline flow-direction No.1 height.
Step 2, the feedwater of outlet is added to be heated by feedwater piping in No. zero Gao Jianei from No.1 height and enters province's coal
Device, economizer import feed temperature are enhanced, and wherein flue gas and the heat exchange amount of feedwater 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 more than 80%；SCR takes off
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 reused 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 of waste water preheater and electric precipitator, desulfurizing tower,
High-concentration waste coolant-temperature gage is improved to the heat demand for 80-100 DEG C, being further reduced its evaporation.
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
Grain size is 30-100 μm of drop, spurts into evaporator.
Step 7, the bypass flue baffle is opened, by adjusting the control of its aperture into the flue gas of air preheater bypass flue
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 being atomized
Water comes into full contact with and by its rapid evaporation, and the vapor and particulate matter for evaporating 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.
Embodiment 2
As shown in Fig. 2, for another wide load denitration and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, the present embodiment with
Embodiment 1 is only different in feedwater backheat subsystem, and something in common is no longer repeated, difference lies in：
The feedwater backheat subsystem includes high steam pipeline A30, the import of the high steam pipeline A30 and steamer
The high pressure cylinder of machine 18 is connected, and the outlet of the high steam pipeline A30 connects No. zero height and adds 20；The high steam pipeline A30
It is equipped with the high steam pipeline valve A29 of adjustable aperture.
The method of the present embodiment is different only in " step 1 " with embodiment 1, and something in common is no longer repeated, area
It is not：
Step 1, when unit load reduces, high steam pipeline valve A29 is opened, steam stream is controlled by adjusting aperture
Amount, the high steam from steam turbine 18 add 20 by high steam pipeline A30 into No. zero height, and heating adds 19 from No.1 height
Feedwater, the hydrophobic of generation flow to No.1 height by No. zero HP heater drainage pipeline 34 and add 19.
Embodiment 3
As shown in figure 3, for another wide load denitration and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, the present embodiment with
Embodiment 1 is only different in feedwater backheat subsystem, and something in common is no longer repeated, difference lies in：
The feedwater backheat subsystem includes high steam pipeline B33, the import and filling of the high steam pipeline B33
Pipeline 36 is connected, and the outlet of the high steam pipeline B33 adds 20 to be connected with No. zero height；Wherein, the gas filling pipeline 36 into
Mouth is connected with main steam line 17, and the outlet of the gas filling pipeline 36 is connected with steam turbine 18；The gas filling pipeline 36 and high pressure
The filling regulating valve 31 of adjustable aperture and high steam pipeline valve B31 are respectively equipped on jet chimney B33；The high steam
The junction of pipeline B33 and gas filling pipeline 36 is between filling regulating valve 31 and steam turbine 18.
The method of the present embodiment is different only in " step 1 " with embodiment 1, and something in common is no longer repeated, area
It is not：
Step 1, when unit load reduces, filling regulating valve 31 and high steam pipeline valve B32 are opened, is opened by adjusting
Degree control steam flow, the partial high pressure steam of gas filling pipeline 36 add 20 by high steam pipeline B33 into No. zero height, heating
Add 19 feedwater from No.1 height, the hydrophobic of generation flows to No.1 height by No. zero HP heater drainage pipeline 34 and add 19.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, that is made any repaiies
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of width load denitration and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, including being 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), (19) and No. zero height is added to add (20) equipped with No.1 height successively on the feedwater piping (21)；
Further include the steam turbine (18) being connect by main steam line (17) with boiler；It is characterized in that, further include feedwater backheat subsystem
System and air preheater bypass flue evaporative subsystem；
The feedwater 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 connected the import of injector (26), the injection respectively by the outlet of jetting steam caused pipeline (24)
Jet chimney (22) connection boiler (1), it is described to be connected by jetting steam caused pipeline (24) by one section of extraction line (28) of steam turbine
Steam turbine (18)；The outlet of the injector (26) connects No. zero height by mixed vapour pipeline (27) and adds (20)；
Or the feedwater backheat subsystem includes high steam pipeline A (30), the import of the high steam pipeline A (30) and vapour
The high pressure cylinder of turbine (18) is connected, and the outlet of the high steam pipeline A (30) connects No. zero height and adds (20)；
Or the feedwater backheat subsystem includes high steam pipeline B (33), the import of the high steam pipeline B (33) and benefit
Steam pipe road (36) is connected, and the outlet of the high steam pipeline B (33) adds (20) to be connected with No. zero height；Wherein, the steam supply pipe
The import in road (36) is connected with main steam line (17), and the outlet of the gas filling pipeline (36) is connected with steam turbine (18)；
The air preheater bypass flue evaporative subsystem is included through 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. width load denitration according to claim 1 and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, 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 steam turbine
The high pressure cylinder connection of machine (18), the outlet of one section of extraction line (28) of steam turbine add (19) to be connected with No.1 height simultaneously.
3. width load denitration according to claim 1 and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, which is characterized in that
No. zero height add (20) and No.1 height add (19) between be additionally provided with No. zero HP heater drainage pipeline (34) in parallel with feedwater piping.
4. width load denitration according to claim 1 and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, 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)；
The high steam pipeline A (30) is equipped with the high steam pipeline valve A (29) of adjustable aperture；
Be respectively equipped on the gas filling pipeline (36) and high steam pipeline B (33) adjustable aperture filling regulating valve (31) and
High steam pipeline valve B (31)；The high steam pipeline B (33) and the junction of gas filling pipeline (36) are located at filling regulating valve
(31) between steam turbine (18).
5. width load denitration according to claim 1 and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, 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. width load denitration according to claim 1 and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, 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
Pipeline (35) discharges clear water.
7. width load denitration according to claim 1 and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, 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. width load denitration according to claim 1 and the desulfurization wastewater Zero discharging system of UTILIZATION OF VESIDUAL HEAT IN, 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).
9. based on the desulfurization wastewater Zero discharging system of the wide load denitration of claim 1~8 any one of them and UTILIZATION OF VESIDUAL HEAT IN reality
The existing wide load denitration of unit and the method for the desulfurization wastewater zero-emission of UTILIZATION OF VESIDUAL HEAT IN, which is characterized in that include the following steps：
Step 1, when unit load reduces, jetting steam caused pipeline valve is opened and by jetting steam caused pipeline valve, it is respective by adjusting
Aperture controls steam flow；Jetting steam caused from boiler separating panel superheater outlet enters injection by jetting steam caused pipeline
Device, 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；It is described jetting steam caused
Mix in injector with by jetting steam caused, added by mixed vapour pipeline into No. zero height, heat from No.1 height add to
Water, the hydrophobic of generation are added by No. zero HP heater drainage pipeline flow-direction No.1 height；
Or when unit load reduces, high steam pipeline valve A is opened, steam flow is controlled by adjusting aperture, from steamer
The high steam of machine is added by high steam pipeline A into No. zero height, heats the feedwater added from No.1 height, and the hydrophobic of generation is led to
Zero passage HP heater drainage pipeline flow-direction No.1 height adds；
Or when unit load reduces, filling regulating valve and high steam pipeline valve B are opened, steam stream is controlled by adjusting aperture
Amount, the partial high pressure steam of gas filling pipeline added by high steam pipeline B into No. zero height, heat from No.1 height add to
Water, the hydrophobic of generation are added by No. zero HP heater drainage pipeline flow-direction No.1 height；
Step 2, the feedwater of outlet is added to be heated by feedwater piping in No. zero Gao Jianei from No.1 height and enters economizer, is saved
Coal device import feed temperature is enhanced, and wherein flue gas and the heat exchange amount of feedwater is reduced, the flue-gas temperature quilt of SCR denitration device import
320-420 DEG C is increased to, ensures that the denitration efficiency under the wide loading condiction of unit can stably reach more than 80%；SCR denitration device
The flue-gas temperature of outlet is also increased to 320 DEG C or more；
Step 3, desulfurization wastewater enters Softening box, reduces the hardness to 200mg/L hereinafter, preventing gentle solution desulfurization wastewater in reverse osmosis
Fouling and blocking in saturating device；
Step 4, the desulfurization wastewater after softening enters reverse osmosis unit, and high-concentration waste water and clear is filtered by reverse osmosis membrane group
Water, wherein high-concentration waste water enter waste water preheater, and clear water is reused by fresh water pipeline discharge；Desulfurization wastewater water simultaneously
It reduces, the heat that preheating and evaporation need is reduced；
Step 5, it exchanges heat into the flue gas between the high-concentration waste water of waste water preheater and electric precipitator, desulfurizing tower, it will be high
Concentration waste water temperature improves the heat demand for 80-100 DEG C, being further reduced its evaporation；
Step 6, the waste water after being heated by the waste water preheater enters spray nozzle through waste water pump, is atomized as average grain diameter
For 30-100 μm of drop, evaporator is spurted into；
Step 7, the bypass flue baffle is opened, by adjusting the control of its aperture into the flue gas stream of air preheater bypass flue
Amount, flue gas enter from upper end of evaporator, are come into full contact with and by its rapid evaporation with atomization waste water, evaporate generation vapor and
Particulate matter is discharged with flue gas from the bottom of evaporator, is eventually entered into electric precipitator and is captured, realizes the zero-emission of desulfurization wastewater.
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