CN107973475A - Desulfurization wastewater Zero discharging system and method based on waste heat reuse under running on the lower load - Google Patents
Desulfurization wastewater Zero discharging system and method based on waste heat reuse under running on the lower load Download PDFInfo
- Publication number
- CN107973475A CN107973475A CN201711451275.7A CN201711451275A CN107973475A CN 107973475 A CN107973475 A CN 107973475A CN 201711451275 A CN201711451275 A CN 201711451275A CN 107973475 A CN107973475 A CN 107973475A
- Authority
- CN
- China
- Prior art keywords
- desulfurization wastewater
- flue
- waste water
- waste
- economizer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000002351 wastewater Substances 0.000 title claims abstract description 126
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 60
- 230000023556 desulfurization Effects 0.000 title claims abstract description 60
- 239000002918 waste heat Substances 0.000 title claims abstract description 28
- 238000007599 discharging Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 16
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000003546 flue gas Substances 0.000 claims abstract description 35
- 239000007789 gas Substances 0.000 claims abstract description 28
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 15
- 238000001704 evaporation Methods 0.000 claims abstract description 15
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 230000008020 evaporation Effects 0.000 claims abstract description 14
- 239000007921 spray Substances 0.000 claims abstract description 14
- 239000002699 waste material Substances 0.000 claims abstract description 12
- 239000012716 precipitator Substances 0.000 claims description 23
- 230000003009 desulfurizing effect Effects 0.000 claims description 12
- 239000003517 fume Substances 0.000 claims description 8
- 239000013505 freshwater Substances 0.000 claims description 7
- 230000036961 partial effect Effects 0.000 claims description 6
- 238000001223 reverse osmosis Methods 0.000 claims description 6
- 230000000903 blocking effect Effects 0.000 claims description 5
- 239000013618 particulate matter Substances 0.000 claims description 4
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 3
- 150000002500 ions Chemical class 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 235000019504 cigarettes Nutrition 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 238000000889 atomisation Methods 0.000 abstract description 2
- 230000008569 process Effects 0.000 abstract description 2
- 239000003245 coal Substances 0.000 description 6
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 229910000019 calcium carbonate Inorganic materials 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000003500 flue dust Substances 0.000 description 1
- JEGUKCSWCFPDGT-UHFFFAOYSA-N h2o hydrate Chemical compound O.O JEGUKCSWCFPDGT-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000000670 limiting effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F1/10—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
- C02F1/12—Spray evaporation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- 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
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Health & Medical Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The present invention relates to desulfurization wastewater Zero discharging system and method based on waste heat reuse under a kind of running on the lower load.The desulfurization wastewater Zero discharging system includes economizer gas bypass subsystem and desulfurization wastewater evaporative subsystem.The economizer gas bypass subsystem includes economizer bypass flue, can improve the exhaust gas temperature and denitration efficiency under unit running on the lower load；The desulfurization wastewater evaporative subsystem includes waste pipe, Softening box, enrichment facility, waste water preheater, gas cooler, heating agent water pump, heating agent waterpipe, waste water pump and spray nozzle, concentration decrement, preheating and atomization can be carried out to waste water, lift its evaporation efficiency.The invention further relates to a kind of method for realizing desulfurization wastewater zero-emission under running on the lower load using the above-mentioned desulfurization wastewater Zero discharging system based on waste heat reuse.The present invention has the characteristics that technological process is simple, the zero-emission that thermal flue gas realizes waste water can be efficiently used under unit running on the lower load, while can also improve system denitration efficiency.
Description
Technical field
The present invention relates to desulfurization wastewater Zero discharging system and method based on waste heat reuse under a kind of running on the lower load, specifically
For a kind of system and method for evaporating desulfurization wastewater using thermal flue gas under coal-burning power plant's running on the lower load, belong to thermal power generation
Energy-saving and emission-reduction field.
Background technology
Low temperature flue evaporation technique is one of technical way for realizing Desulphurization for Coal-fired Power Plant wastewater zero discharge, its principle
It is the flue by desulfurization wastewater atomized spray between air preheater and electric precipitator, evaporates waste water using fume waste heat as heat source,
Resulting particulate matter etc. is captured with flue gas into electric precipitator.Since space is limited, which must be when shorter
The interior evaporation for completing waste water.Recent year coal unit is chronically at underrun state, the boiler when load reduction
Exhaust gas temperature also decreases, and causes the thermal energy of air preheater exiting flue gas to be not enough to evaporate waste water in given time, waste water
Drop is attached to flue inner wall, and the problems such as may causing fouling, dust stratification, blocking and corrode, electric precipitation can be even influenced when serious
The normal operation of device, desulfurization wastewater low temperature flue evaporation technique will be unable to come into operation.Improving exhaust gas temperature becomes reality
The key of desulfurization wastewater zero-emission under existing unit running on the lower load.
Another serious problems caused by performing low-load running of machine set are the decline of denitration efficiency, it is however generally that denitrating catalyst
Active reaction temperature is 320-420 DEG C, and when flue-gas temperature is too low, efficiency can be greatly reduced in SCR denitration equipment, when serious even
It is forced out of service, the discharge of nitrogen oxides will be unable to the requirement for reaching national minimum discharge.Economizer gas bypass technology is
Solve the problems, such as one of important method of unit underload denitration, its principle is to set the flue duct bypass in parallel with economizer, from province
Flue collector before coal device draws partial fume and directly imports the flue collector after economizer, since flue gas is changed with what is fed water in economizer
Heat is lowered, and the temperature of SCR denitration equipment entrance flue gas gets a promotion, it is ensured that the efficiency of SCR denitration equipment.However, by
In the raising of flue-gas temperature, this method also results in the increase of boiler exhaust gas heat loss, rationally using the part waste heat to improving
Unit capacity usage ratio important in inhibiting.
In conclusion under unit running on the lower load, desulfurization wastewater needs more sufficient thermal energy to realize zero-emission；Save
Coal device gas bypass technology also result in the raising of flue-gas temperature while denitration effect is improved, and increase boiler exhaust gas heat waste
Lose.If evaporation of the partial heat energy for desulfurization wastewater, can not only realize wastewater zero discharge, unit energy profit can be more improved
With rate.
The content of the invention
To solve the above problems, the present invention provides the desulfurization wastewater zero-emission based on waste heat reuse under a kind of running on the lower load
System and method.The desulfurization wastewater Zero discharging system is a kind of joint economizer gas bypass subsystem and desulfurization wastewater evaporation
The system of subsystem, can efficiently use the zero-emission that unit thermal flue gas realizes waste water under unit running on the lower load.Wherein, save
Coal device gas bypass subsystem can lift unit underload denitration efficiency and smoke evacuation heat content；Desulfurization wastewater evaporative subsystem can be to useless
Water is pre-processed, concentrates decrement and atomization etc., is reduced its evaporation process to the demand of thermal energy and is realized zero-emission.
The purpose of the present invention is what is be achieved through the following technical solutions：
Desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load, including be sequentially connected by flue
Boiler, economizer, SCR denitration equipment, air preheater, electric precipitator and desulfurizing tower, it is characterised in that further include economizer flue gas
Bypass subsystem and desulfurization wastewater evaporative subsystem；
Wherein, the economizer gas bypass subsystem includes economizer bypass flue；
The desulfurization wastewater evaporative subsystem is included by the sequentially connected Softening box of waste pipe, enrichment facility, waste water
Preheater, waste water pump and spray nozzle；Wherein, the Softening box connects desulfurizing tower, the atomized spray by waste pipe
Device is installed in the flue between the air preheater and electric precipitator.
Further, the flue collector before the entrance connection economizer entrance of the economizer bypass flue, junction is equipped with
The bypass flue baffle of adjustable aperture, the outlet of the economizer bypass flue connect the flue collector after economizer exit.
Further, gas cooler is installed in the flue between the electric precipitator and desulfurizing tower, the flue gas is cold
But device is connected by heating agent waterpipe with waste water preheater, and the waste water preheater is installed between enrichment facility and waste water pump
On waste pipe.
Further, the heating agent waterpipe is equipped with heating agent water pump.
Further, the enrichment facility uses principle of reverse osmosis, and desulfurization wastewater is filtered into high-concentration waste water and clear water.
Further, the enrichment facility is additionally provided with fresh water pipeline.
Desulfurization wastewater zero under running on the lower load is realized using the desulfurization wastewater Zero discharging system based on waste heat reuse
The method of discharge, comprises the following steps：
Step 1, when unit load reduces, bypass flue baffle is opened, enters economizer by adjusting the control of its aperture
The flow of bypass flue flue gas, flue collector of the partial fume after economizer bypass flue enters economizer exit are mixed with main flue gas
Close, SCR denitration equipment importation flue-gas temperature is promoted to more than 320 DEG C, SCR denitration device efficiency is promoted to more than 80%；
Meanwhile air preheater exit gas temperature accordingly improves 5-20 DEG C, more sufficient heat source is provided for desulfurization wastewater evaporation；
Step 2, desulfurization wastewater enters Softening box, removes desulfurization wastewater hardness ions, hardness is adjusted to below 150ppm
(with calcium carbonate), alleviates and prevents waste water from fouling and blocking occurring in enrichment facility；Desulfurization wastewater after softening enters dense
Compression apparatus, high-concentration waste water and clear water are filtered into by reverse osmosis membrane, and wherein clear water is reused by fresh water pipeline discharge,
High-concentration waste water enters waste water preheater；
Step 3, high temperature heat medium water heat being absorbed into the high-concentration waste water of waste water preheater, temperature improves about 40-60 DEG C,
Further reduce the heat demand of its evaporation；Heat medium water after heat release enter gas cooler absorb electric precipitator and desulfurizing tower it
Between flue gas waste heat lifting temperature, returned under the action of heating agent water pump waste water preheater continue heat release, circulated with this；
Step 4, enter spray nozzle through waste water pump by the desulfurization wastewater that waste water preheater is discharged, be atomized as average grain
The drop that about 30-60 μm of footpath, sprays the flue between air preheater and electric precipitator, and moisture absorption fume waste heat is evaporated, production
Raw solid particulate matter is captured with main flue gas into electric precipitator, completes wastewater zero discharge.
Beneficial effects of the present invention are：
1. improving the temperature of flue gas between air preheater and electric precipitator, solves flue-gas temperature deficiency under running on the lower load
Caused waste water evaporates incomplete problem, realizes the zero-emission of desulfurization wastewater.
2. being preheated using the waste heat of flue gas between electric precipitator and desulfurizing tower to waste water, removed using air preheater and electricity
The waste heat of flue gas is evaporated waste water between dirt device, improves system capacity utilization rate.
3. improve the temperature of SCR denitration equipment importation flue gas, it is ensured that the denitration efficiency of unit in low- load conditions.
4. waste water evaporation increases smoke moisture, be conducive to the reunion of wherein flue dust, reduce the discharge of fine particle.
5. improving air preheater entrance flue gas temperature, it is too low caused to alleviate air preheater cold junction temperature under running on the lower load
The problems such as fouling and blocking.
6. the concentration of waste water can generating unit distinguish water, saved water resource.
Brief description of the drawings
Fig. 1 is the structural representation of the desulfurization wastewater Zero discharging system based on waste heat reuse under running on the lower load of the present invention
Figure；
Wherein, 1- boilers, 2- economizers, 3-SCR denitration devices, 4- air preheaters, 5- electric precipitators, 6- desulfurizing towers, 7- are soft
Change case, 8- enrichment facilities, 9- waste water preheaters, 10- gas coolers, 11- heating agent water pumps, 12- waste water pumps, 13- atomized sprays
Device, 14- waste pipes, 15- fresh water pipelines, 16- flue collectors, 17- economizer bypass flues, 18- bypass flue baffles, 19- give
Waterpipe, 20- heating agent waterpipes.
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.
As shown in Figure 1, the desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load, including pass through cigarette
The sequentially connected boiler 1 in road, economizer 2, SCR denitration equipment 3, air preheater 4, electric precipitator 5 and desulfurizing tower 6, further include province's coal
Device gas bypass subsystem and desulfurization wastewater evaporative subsystem；
Wherein, the economizer gas bypass subsystem includes economizer bypass flue 17；The economizer bypass flue
Flue collector 16 before 17 entrance connection 2 entrance of economizer, junction is equipped with the bypass flue baffle 18 of adjustable aperture, described
Flue collector 16 behind outlet connection economizer 2 outlet of economizer bypass flue 17.
The desulfurization wastewater evaporative subsystem include by the sequentially connected Softening box 7 of waste pipe 14, enrichment facility 8,
Waste water preheater 9, waste water pump 12 and spray nozzle 13；Wherein, the Softening box 7 connects desulfurizing tower 6 by waste pipe 14,
The spray nozzle 13 is installed in the flue between the air preheater 4 and electric precipitator 5.The electric precipitator 5 and desulfurization
Gas cooler 10 is installed, the gas cooler 10 is preheated by heating agent waterpipe 20 and waste water in the flue between tower 6
Device 9 is connected, and the waste water preheater 9 is installed on the waste pipe 14 between enrichment facility 8 and waste water pump 12.The heat medium water
Pipeline 9 is equipped with heating agent water pump 11.
The enrichment facility 8 uses principle of reverse osmosis, and desulfurization wastewater is filtered into high-concentration waste water and clear water.
The enrichment facility 8 is additionally provided with fresh water pipeline 15.
Desulfurization wastewater zero under running on the lower load is realized using the desulfurization wastewater Zero discharging system based on waste heat reuse
The method of discharge, comprises the following steps：
Step 1, when unit load reduces, bypass flue baffle 18 is opened, enters province's coal by adjusting the control of its aperture
The flow of 17 flue gas of device bypass flue, partial fume through economizer bypass flue 17 enter economizer 2 export after flue collector with
Main flue gas mixes, and exchanges heat since the partial fume is introduced into economizer 2 with boiler feedwater, can be by 3 import of SCR denitration equipment
Flue-gas temperature is promoted to more than 320 DEG C, by 3 improved efficiency of SCR denitration equipment to more than 80%；Meanwhile 4 exiting flue gas of air preheater
Temperature accordingly improves about 5-20 DEG C, and more sufficient heat source is provided for desulfurization wastewater evaporation.
Step 2, desulfurization wastewater enters Softening box 7, removes desulfurization wastewater hardness ions, hardness is adjusted to below 150ppm
(with calcium carbonate), alleviates and prevents waste water from fouling and blocking occurring in enrichment facility 8；Desulfurization wastewater after softening enters dense
Compression apparatus 8, is filtered into high-concentration waste water and clear water, wherein clear water is discharged sharp again by fresh water pipeline 15 by reverse osmosis membrane
With high-concentration waste water enters waste water preheater 9；Due to the reduction of waste water water, it evaporates the heat needed and is reduced.
Step 3, high temperature heat medium water heat is absorbed into the high-concentration waste water of waste water preheater 9, temperature improves about 40-60
DEG C, further reduce its heat demand evaporated；Heat medium water after heat release enters gas cooler 10 and absorbs electric precipitator 5 and take off
The waste heat lifting temperature of flue gas, waste water preheater 9 is returned under the action of heating agent water pump 11 and continues heat release, with this between sulphur tower 6
Circulation；
Step 4, by the desulfurization wastewater that waste water preheater 9 is discharged through waste water pump 12 enter spray nozzle 13, be atomized for
The drop that about 30-60 μm of average grain diameter, sprays the flue between air preheater 4 and electric precipitator 5, moisture absorption fume waste heat quilt
Evaporation, the solid particulate matter of generation are captured with main flue gas into electric precipitator 5, complete wastewater zero discharge.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the invention, for the skill of this area
For art personnel, the invention may be variously modified and varied.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should all be included in the protection scope of the present invention.
Claims (7)
1. the desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load, including it is sequentially connected by flue
Boiler (1), economizer (2), SCR denitration equipment (3), air preheater (4), electric precipitator (5) and desulfurizing tower (6), it is characterised in that
Further include economizer gas bypass subsystem and desulfurization wastewater evaporative subsystem；
Wherein, the economizer gas bypass subsystem includes economizer bypass flue (17)；
The desulfurization wastewater evaporative subsystem is included by waste pipe (14) sequentially connected Softening box (7), enrichment facility
(8), waste water preheater (9), waste water pump (12) and spray nozzle (13)；Wherein, the Softening box (7) passes through waste pipe
(14) desulfurizing tower (6) is connected, the spray nozzle (13) is installed on the cigarette between the air preheater (4) and electric precipitator (5)
In road.
2. the desulfurization wastewater Zero discharging system based on waste heat reuse, its feature under running on the lower load according to claim 1
It is, the flue collector (16) before entrance connection economizer (2) entrance of the economizer bypass flue (17), junction is equipped with can
The bypass flue baffle (18) of aperture is adjusted, behind outlet connection economizer (2) outlet of the economizer bypass flue (17)
Flue collector (16).
3. the desulfurization wastewater Zero discharging system based on waste heat reuse, its feature under running on the lower load according to claim 1
It is, gas cooler (10), the flue gas cooling is installed in the flue between the electric precipitator (5) and desulfurizing tower (6)
Device (10) is connected by heating agent waterpipe (20) with waste water preheater (9), and the waste water preheater (9) is installed on enrichment facility
(8) on the waste pipe (14) between waste water pump (12).
4. the desulfurization wastewater Zero discharging system based on waste heat reuse, its feature under running on the lower load according to claim 3
It is, the heating agent waterpipe (9) is equipped with heating agent water pump (11).
5. the desulfurization wastewater Zero discharging system based on waste heat reuse, its feature under running on the lower load according to claim 1
It is, the enrichment facility (8) uses principle of reverse osmosis, and desulfurization wastewater is filtered into high-concentration waste water and clear water.
6. the desulfurization wastewater Zero discharging system based on waste heat reuse, its feature under running on the lower load according to claim 5
It is, the enrichment facility (8) is additionally provided with fresh water pipeline (15).
7. realize underload using desulfurization wastewater Zero discharging system of claim 1~6 any one of them based on waste heat reuse
The method of desulfurization wastewater zero-emission under operating mode, it is characterised in that comprise the following steps：
Step 1, when unit load reduces, bypass flue baffle (18) is opened, enters economizer by adjusting the control of its aperture
The flow of bypass flue (17) flue gas, partial fume through economizer bypass flue (17) enter economizer exit after flue collector with
Main flue gas mixes, and SCR denitration equipment (3) input gas temperature is promoted to more than 320 DEG C, SCR denitration equipment (3) efficiency is carried
Rise to more than 80%；Meanwhile air preheater (4) exit gas temperature accordingly improves 5-20 DEG C, provided more for desulfurization wastewater evaporation
Sufficient heat source；
Step 2, desulfurization wastewater enters Softening box (7), removes desulfurization wastewater hardness ions, hardness is adjusted to below 150ppm,
Alleviate and prevent waste water from fouling and blocking occurring in enrichment facility；Desulfurization wastewater after softening enters enrichment facility (8), passes through
Reverse osmosis membrane is filtered into high-concentration waste water and clear water, and wherein clear water is reused by fresh water pipeline (15) discharge, high concentration
Waste water enters waste water preheater (9)；
Step 3, high temperature heat medium water heat being absorbed into the high-concentration waste water of waste water preheater (9), temperature improves about 40-60 DEG C,
Further reduce the heat demand of its evaporation；Heat medium water after heat release enter gas cooler (10) absorb electric precipitator (5) and
The waste heat lifting temperature of flue gas, waste water preheater (9) is returned under the action of heating agent water pump (11) and continues to put between desulfurizing tower (6)
Heat, is circulated with this；
Step 4, the desulfurization wastewater discharged by waste water preheater (9) enters spray nozzle (13) through waste water pump (12), is atomized
For about 30-60 μm of drop of average grain diameter, the flue between air preheater (4) and electric precipitator (5), moisture absorption flue gas are sprayed
Waste heat is evaporated, and the solid particulate matter of generation is captured with main flue gas into electric precipitator (5), completes wastewater zero discharge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711451275.7A CN107973475A (en) | 2017-12-27 | 2017-12-27 | Desulfurization wastewater Zero discharging system and method based on waste heat reuse under running on the lower load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711451275.7A CN107973475A (en) | 2017-12-27 | 2017-12-27 | Desulfurization wastewater Zero discharging system and method based on waste heat reuse under running on the lower load |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107973475A true CN107973475A (en) | 2018-05-01 |
Family
ID=62007871
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711451275.7A Pending CN107973475A (en) | 2017-12-27 | 2017-12-27 | Desulfurization wastewater Zero discharging system and method based on waste heat reuse under running on the lower load |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107973475A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109455867A (en) * | 2018-12-28 | 2019-03-12 | 大唐环境产业集团股份有限公司 | A kind of flexibly adjustable thermal power plant's full load high-salinity wastewater zero-emission system and method |
| CN109626691A (en) * | 2018-12-28 | 2019-04-16 | 大唐环境产业集团股份有限公司 | A kind of flexibly adjustable thermal power plant's high-salinity wastewater zero-emission system and method |
| CN110372142A (en) * | 2019-07-10 | 2019-10-25 | 中国华电科工集团有限公司 | A kind of device using low-grade flue gas processing waste water |
| CN110748901A (en) * | 2019-11-04 | 2020-02-04 | 洪新思 | High-temperature catalytic sewage treatment device and high-temperature catalytic sewage treatment process |
| CN111362342A (en) * | 2019-11-06 | 2020-07-03 | 北京铝能清新环境技术有限公司 | Wastewater zero discharge system and method for multi-stage treatment |
| CN114585430A (en) * | 2019-11-15 | 2022-06-03 | 普莱克斯技术有限公司 | Energy-saving VPSA system using directly-driven high-speed centrifugal compressor |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716100A (en) * | 2016-03-31 | 2016-06-29 | 大唐环境产业集团股份有限公司 | Denitrating coal economizer high-temperature bypass device |
| CN107143841A (en) * | 2017-05-22 | 2017-09-08 | 大唐(北京)能源管理有限公司 | The comprehensive improvement system of desulfurization wastewater and thermal flue gas under a kind of running on the lower load |
| CN207845404U (en) * | 2017-12-27 | 2018-09-11 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load |
-
2017
- 2017-12-27 CN CN201711451275.7A patent/CN107973475A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105716100A (en) * | 2016-03-31 | 2016-06-29 | 大唐环境产业集团股份有限公司 | Denitrating coal economizer high-temperature bypass device |
| CN107143841A (en) * | 2017-05-22 | 2017-09-08 | 大唐(北京)能源管理有限公司 | The comprehensive improvement system of desulfurization wastewater and thermal flue gas under a kind of running on the lower load |
| CN207845404U (en) * | 2017-12-27 | 2018-09-11 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load |
Non-Patent Citations (1)
| Title |
|---|
| 周至祥等, 中国电力出版社 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109455867A (en) * | 2018-12-28 | 2019-03-12 | 大唐环境产业集团股份有限公司 | A kind of flexibly adjustable thermal power plant's full load high-salinity wastewater zero-emission system and method |
| CN109626691A (en) * | 2018-12-28 | 2019-04-16 | 大唐环境产业集团股份有限公司 | A kind of flexibly adjustable thermal power plant's high-salinity wastewater zero-emission system and method |
| CN109626691B (en) * | 2018-12-28 | 2023-04-18 | 大唐环境产业集团股份有限公司 | Flexible and adjustable zero discharge system and method for high-salinity wastewater of thermal power plant |
| CN109455867B (en) * | 2018-12-28 | 2023-04-25 | 大唐环境产业集团股份有限公司 | Flexible and adjustable thermal power plant full-load high-salinity wastewater zero-emission system and method |
| CN110372142A (en) * | 2019-07-10 | 2019-10-25 | 中国华电科工集团有限公司 | A kind of device using low-grade flue gas processing waste water |
| CN110748901A (en) * | 2019-11-04 | 2020-02-04 | 洪新思 | High-temperature catalytic sewage treatment device and high-temperature catalytic sewage treatment process |
| CN111362342A (en) * | 2019-11-06 | 2020-07-03 | 北京铝能清新环境技术有限公司 | Wastewater zero discharge system and method for multi-stage treatment |
| CN114585430A (en) * | 2019-11-15 | 2022-06-03 | 普莱克斯技术有限公司 | Energy-saving VPSA system using directly-driven high-speed centrifugal compressor |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107973475A (en) | Desulfurization wastewater Zero discharging system and method based on waste heat reuse under running on the lower load | |
| CN103982903B (en) | System and method for treating tail end waste water by using smoke waste heat | |
| CN105457468B (en) | The technique that a kind of tower boiler flue gas recycled is atomized desulfurization wastewater | |
| CN204923035U (en) | Processing system is synthesized to coal fired boiler's flue gas | |
| CN107143841A (en) | The comprehensive improvement system of desulfurization wastewater and thermal flue gas under a kind of running on the lower load | |
| CN107032428A (en) | A kind of undersaturation flue gas condensing crystallizing desulfurization wastewater zero-discharge treatment system and method | |
| CN107935292A (en) | The system and method for smoke discharging residual heat evaporation desulfurization wastewater are utilized under running on the lower load | |
| CN106731538A (en) | A kind of dry desulfurization dust pelletizing system and its flue gas water saving fixtures | |
| CN206799197U (en) | A kind of undersaturation flue gas condensing crystallizing desulfurization wastewater zero-discharge treatment system | |
| CN207845404U (en) | Desulfurization wastewater Zero discharging system based on waste heat reuse under a kind of running on the lower load | |
| CN108190986A (en) | A kind of flue is classified pre- thermal evaporation desulfurization wastewater Zero discharging system and its method of work | |
| CN114151817A (en) | Flue gas treatment system and treatment method | |
| CN109939557A (en) | The system and method for coloured plume are eliminated in collaboration | |
| CN204018028U (en) | A kind of high-efficient wet-type electric precipitation purifier of wet-method desulfurized fume | |
| CN210699404U (en) | Sulfur trioxide removal system applied to high-sulfur high-ash low-temperature flue gas environment | |
| CN108126507A (en) | For the water treatment technology system and method for wet desulphurization | |
| CN207748984U (en) | The system of smoke discharging residual heat evaporation desulfurization wastewater is utilized under running on the lower load | |
| CN207748983U (en) | A kind of desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN | |
| CN106179739A (en) | Dust arrester and flue gas ash removal method | |
| CN107101216B (en) | Back-pumping leakage-proof original clean flue gas back-heating type heat exchange system and working method thereof | |
| CN207748982U (en) | The desulfurization wastewater Zero discharging system of smoke discharging residual heat is utilized under running on the lower load | |
| CN104785094A (en) | Desulphurization and dust-removal integrated device for gas fume of boiler | |
| CN107344052A (en) | Gas cleaning and plume control method and device | |
| CN105299674B (en) | A kind of Multifunctional smoke energy-saving and emission-reduction system | |
| CN207845405U (en) | A kind of desulfurization wastewater Zero discharging system of width load denitration and UTILIZATION OF VESIDUAL HEAT IN |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180501 |