CN106587235A - Full-load gradient flue gas waste heat evaporative waste water control system and control method thereof - Google Patents
Full-load gradient flue gas waste heat evaporative waste water control system and control method thereof Download PDFInfo
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- CN106587235A CN106587235A CN201710070524.1A CN201710070524A CN106587235A CN 106587235 A CN106587235 A CN 106587235A CN 201710070524 A CN201710070524 A CN 201710070524A CN 106587235 A CN106587235 A CN 106587235A
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- 239000002351 wastewater Substances 0.000 title claims abstract description 212
- 239000003546 flue gas Substances 0.000 title claims abstract description 174
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 172
- 238000000034 method Methods 0.000 title claims abstract description 28
- 239000002918 waste heat Substances 0.000 title abstract description 5
- 238000001704 evaporation Methods 0.000 claims abstract description 131
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 21
- 230000008569 process Effects 0.000 claims abstract description 10
- 230000008020 evaporation Effects 0.000 claims description 71
- 239000007921 spray Substances 0.000 claims description 59
- 239000000779 smoke Substances 0.000 claims description 38
- 239000003517 fume Substances 0.000 claims description 20
- 239000012717 electrostatic precipitator Substances 0.000 claims description 18
- 239000004071 soot Substances 0.000 claims description 17
- 239000007788 liquid Substances 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 12
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- 238000010992 reflux Methods 0.000 claims description 6
- 230000001105 regulatory effect Effects 0.000 claims description 6
- 235000019504 cigarettes Nutrition 0.000 claims description 3
- 239000010802 sludge Substances 0.000 claims description 3
- 239000002002 slurry Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 3
- 238000012546 transfer Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000000926 separation method Methods 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims 1
- 238000005373 pervaporation Methods 0.000 claims 1
- 238000005507 spraying Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 abstract description 3
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 abstract 1
- 239000003245 coal Substances 0.000 abstract 1
- 230000003068 static effect Effects 0.000 abstract 1
- 238000006477 desulfuration reaction Methods 0.000 description 13
- 230000023556 desulfurization Effects 0.000 description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 238000005457 optimization Methods 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 7
- 230000009467 reduction Effects 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 229910052602 gypsum Inorganic materials 0.000 description 2
- 239000010440 gypsum Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000001471 micro-filtration Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
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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
- 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
- C02F1/02—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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/36—Water and air preheating systems
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
-
- 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
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/001—Upstream control, i.e. monitoring for predictive control
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a full-load gradient flue gas waste heat evaporative waste water control system and a control method thereof. The system comprises a boiler coal saver, an air pre-heater, a static dedustor and a desulfurizing tower which are successively connected by a flue. The system further comprises a low-temperature flue gas evaporative waste water concentrating and reducing system, a medium-temperature flue gas evaporative waste water system and a high-temperature flue gas evaporative waste water system which are connected to the flue gas; the low-temperature flue gas evaporative waste water concentrating and reducing system comprises a low-temperature flue gas system, an evaporative reducing tower and a low-temperature waste water spraying system; the medium-temperature flue gas evaporative waste water system comprises a medium-temperature evaporating flue, a waste water spraying system and an ash blowing apparatus; the high-temperature flue gas evaporative waste water system comprises a high-temperature flue gas system, a high-temperature evaporating tower, a waste water spraying system and an ash blower. The system provided by the invention has the advantages of being simple in structure, reasonable in design, mild in evaporating process, high in operating elasticity, reasonable in use of gradient waste heat of flue gas, free of other heat source consumption, relatively small in energy consumption, relatively low in operating cost, environmental-friendly and the like.
Description
Technical field
The present invention relates to technical field of waste water processing, more particularly to a kind of control of full load gradient fume afterheat evaporating waste water
System and its control method.
Background technology
At present coal-burning power plant of China more than 90% employs limestone-gypsum wet flue gas desulfurizing technology.In wet flue gas
In sulfur removal technology, in order to maintain system stable operation and ensure gypsum product quality, need control serosity in Cl- concentration can not mistake
Height, therefore a part of serosity need to be discharged, so as to produce desulfurization wastewater.Desulfurization wastewater is more because of complicated component, pollutant kind, becomes
One of most intractable waste water in coal-burning power plant.It is domestic at present mainly desulfurization to be processed using chemical precipitation method (being commonly called as three headers precipitation)
Waste water, process water outlet salinity is very high, directly easily causes secondary pollution after discharge.Because the desulfurization wastewater water yield is less, saliferous
Amount is high, and in recent years, both at home and abroad many scholars begin one's study desulfurization wastewater near-zero release treatment technology.
In the near-zero release of desulfurization wastewater is processed, mainly including following a few class process routes.Pretreatment (sofening treatment,
Tubular type microfiltration), evaporation and concentration (MED, MVR etc.), embrane method concentration (MBC, UF, NF, RO, DTRO etc.), solidification (evaporative crystallization, from
Right evaporative crystallization, evaporation pond, mechanical spraying evaporation, flue spray evaporation, bypass smoke evaporative).However, being directed to above-mentioned a few class works
Skill route, there is also corresponding deficiency, and especially operation is relative complex, control accuracy is not high, high energy consumption, be unfavorable for environmental protection etc.
Defect.Therefore, design a kind of novel desulphurization wastewater treatment equipment be conducive to energy-conserving and environment-protective by with important Research Significance and
Economic implications.
The content of the invention
For deficiency present in desulfurization wastewater near-zero release handling process in prior art, it is an object of the invention to：
A kind of full load gradient fume afterheat evaporating waste water control system and its control method are provided, there is simple structure, design to close for it
Reason, evaporation process is gentle, operating flexibility is high, rationally utilizes flue gas gradient waste heat, it is not necessary to consume other thermals source, less energy intensive,
Operating cost is relatively low, while also effectively reducing the technique water consumption of desulphurization system, reduction exhaust gas temperature makes boiler
Air-introduced machine power consumption is reduced, the advantages of be conducive to environmental protection.
In order to achieve the above object, the present invention adopts the following technical scheme that realization：
A kind of full load gradient fume afterheat evaporating waste water control system, it is characterised in that：
The control system includes boiler economizer, air preheater, electrostatic precipitator and the desulfurization being sequentially connected by flue
Tower, the control system also includes concentrating abatement system, middle temperature flue gas with the low-temperature flue gas evaporating waste water that above-mentioned flue is connected with each other
Evaporating waste water system and high-temperature flue gas evaporating waste water system；
The low-temperature flue gas evaporating waste water concentration abatement system includes：Low-temperature flue gas system, evaporation decrement tower and low temperature are useless
Water sprinkler system；The low-temperature flue gas system, evaporation decrement tower and waste water spray system are connected with each other, and low-temperature flue gas are by evaporation
Decrement tower side lower part enters evaporation decrement tower and is discharged by top, and the nozzle of waste water Jing waste water spray systems is on evaporation decrement tower top
Jet with downward flow direction, with low-temperature flue gas counter current contacting concentration is evaporated；
The middle temperature smoke evaporative waste water system includes：Middle temperature evaporation flue, waste water spray system and soot blower；In described
The waste water spray spout of warm smoke evaporative waste water system is arranged in middle temperature evaporation flue upstream, waste water injection direction and flue gas flow direction
Unanimously；Soot blower is arranged in middle temperature evaporation flue downstream；
The high-temperature flue gas evaporating waste water system includes：High-temperature flue gas system, high temperature evaporation tower, waste water spray system and blow
Grey device；The high-temperature flue gas system, high temperature evaporation tower, waste water spray system and soot blower are connected with each other；The high-temperature flue gas by
High temperature evaporation top of tower is discharged into bottom, and waste water arrangement of nozzles is in high temperature evaporation tower middle and upper part, waste water injection direction and flue gas
Flow direction is consistent, and soot blower is arranged in high temperature evaporation tower middle and lower part；
The waste water is respectively fed to middle temperature smoke evaporative after low-temperature flue gas evaporating waste water concentration abatement system concentration decrement
System and high-temperature flue gas vapo(u)rization system evaporate all waste water.
Used as the further optimization of such scheme, the flue gas of the low-temperature flue gas system is taken from electrostatic precipitator and desulfurization
Flue between tower, on the flue air-introduced machine is provided with；Wherein, it is low-temperature flue gas intake near air-introduced machine outlet, it is close
Desulfurizing tower is low-temperature flue gas refluxing opening；The flue-gas temperature of the low-temperature flue gas system is 50-120 DEG C.
As the further optimization of such scheme, the middle temperature flue gas of the middle temperature evaporation flue take from air preheater with it is quiet
In flue between electric cleaner；Middle temperature flue-gas temperature in the middle temperature evaporation flue is 120-145 DEG C.
As the further optimization of such scheme, the high-temperature flue gas in the high-temperature flue gas system take from boiler economizer and
In flue between air preheater, the high-temperature flue-gas in the high-temperature flue gas system are 300-400 DEG C.
Used as the further optimization of such scheme, the low-temperature flue gas evaporating waste water concentration abatement system, middle temperature flue gas steam
The waste water in waste water system and high-temperature flue gas evaporating waste water system is sent out both from same waste water tank, waste water tank and concentration flow container
It is connected, above-mentioned low-temperature flue gas evaporating waste water concentration abatement system, middle temperature smoke evaporative waste water system and high-temperature flue gas evaporation are useless
Waste water spray system in water system is connected by spray pump with concentration flow container；It is described concentration flow container by slurry excavationg pump with
Solid-liquid separator is connected, and the solid after solid-liquid separator is separated is discharged to sludge treating system；Through solid-liquid separator
Liquid after separation is back in concentration flow container.
Used as the further optimization of such scheme, the solid-liquid separator includes filter press device or belt filter press；
In the low-temperature flue gas evaporating waste water concentration abatement system, middle temperature smoke evaporative waste water system and high-temperature flue gas evaporating waste water system
Waste water spray system be also provided with wastewater pressure transmitter, waste water and adjust door, waste water cut-off gate and waste water stream gauge, waste water
Effusion meter is connected with wastewater pressure transmitter；Waste water adjusts door and waste water cut-off gate is separately positioned on waste water transfer pipeline.
Used as the further optimization of such scheme, the waste water spray system of middle temperature smoke evaporative system also includes air interception
Door, air regulating door and the atomizing air pipeline, mass air flow sensor, air pressure transmitter, the air compressor that are connected with each other；
The high-temperature flue gas evaporation spray system also includes air atomizer spray nozzle, high temperature evaporation tower, the atomizing air being connected with each other successively
Pipeline, air interception door, air regulating door, mass air flow sensor, air pressure transmitter；The high temperature evaporation tower and soot blower phase
Connection.
Used as the further optimization of such scheme, low-temperature flue gas system includes that flue entrance cut-off gate, flue entrance are adjusted
Door, ducting outlet cut-off gate, pressure transmitter, thermocouple, effusion meter, flue entrance cut-off gate and flue entrance adjust door and are all provided with
Put in low-temperature flue gas intake；Ducting outlet adjusts door and ducting outlet cut-off gate is arranged at low-temperature flue gas refluxing opening, pressure
Transmitter, thermocouple and effusion meter are separately positioned in the flue between electrostatic precipitator and desulfurizing tower.
Used as the further optimization of such scheme, the control system is additionally included in line monitoring system, the on-line monitoring
System include being arranged between boiler economizer, air preheater, electrostatic precipitator and desulfurizing tower temperature sensor in flue,
It is arranged on low-temperature flue gas evaporating waste water concentration abatement system, middle temperature smoke evaporative waste water system and high-temperature flue gas evaporating waste water system
In waste water spray system in flow transducer and flow control valve and remote monitoring room industrial computer, the industrial computer
It is connected with the temperature sensor, flow transducer, flow control valve respectively；Industrial computer is passed according to temperature sensor and flow
The real-time monitoring data of sensor, controls the Flow-rate adjustment value of flow control valve.
A kind of above-mentioned control method of full load gradient fume afterheat evaporating waste water control system of the present invention includes following step
Suddenly：
1) in the flue between electrostatic precipitator and desulfurizing tower, extract by using on the air-introduced machine of low-temperature flue gas system
120 DEG C of flue gases of a part send into the side lower part of evaporation decrement tower, and flue gas returns electrostatic and removes after evaporation decrement tower from the bottom to top
Flue between dirt device and desulfurizing tower, using being arranged on some waste water nozzles of evaporation decrement tower top waste water spray system in tower
Interior Jet with downward flow direction, is evaporated concentration process, during waste water is transported to Jing after many times circulate decrement with low-temperature flue gas counter current contacting
Warm smoke evaporative system and high-temperature flue gas vapo(u)rization system；
2) control system controls respectively middle temperature smoke evaporative according to boiler load and the temperature of flue gas in flue by valve
The waste water straying quatity of the waste water spray system of system and high-temperature flue gas vapo(u)rization system；When boiler load is that high load capacity and middle temperature are evaporated
Flue gas heightens the spray of the waste water spray system of middle temperature smoke evaporative system and high-temperature flue gas vapo(u)rization system at 120 DEG C -145 DEG C
Enter amount；When boiler load is underload and middle temperature evaporates flue-gas temperature below 120 DEG C, middle temperature smoke evaporative system is closed
Waste water spray system, opens the waste water spray system of high-temperature flue gas vapo(u)rization system, and waste water is sprayed into into high-temperature flue gas vapo(u)rization system, fills
Divide and realize the most economical method of operation, i.e. wastewater zero discharge using flue gas gradient temperature.
It is useless using full load gradient fume afterheat of the present invention evaporation compared with existing desulfurization wastewater near-zero release handling process
Water control system and its control method have the advantages that：The system evaporation process is gentle, and operating flexibility is high, rationally utilizes
Flue gas gradient waste heat, it is not necessary to consume other thermals source, power consumption is few, takes up an area little, and operating cost is low, the technology and traditional desulfurization
Wastewater processing technology is compared, and desulfurization wastewater forms closed circulation in the system, is discharged without waste water, realizes limestone-stone
Cream Wet Flue Gas Desulfurization Technology wastewater zero discharge.The technique water consumption of desulphurization system can be reduced, and can be by the row of reduction
Cigarette temperature reduces boiler induced-draft fan power consumption, really realizes the double effects of energy-conserving and environment-protective.
Description of the drawings
Accompanying drawing 1 is the structural representation of full load gradient fume afterheat evaporating waste water control system of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings 1 pair of full load gradient fume afterheat evaporating waste water control system of the present invention and its control method are made
To describe in detail.
A kind of full load gradient fume afterheat evaporating waste water control system, the control system includes what is be sequentially connected by flue
Boiler economizer 1, air preheater 2, electrostatic precipitator 3 and desulfurizing tower 4, the control system also includes mutually being interconnected with above-mentioned flue
Low-temperature flue gas evaporating waste water concentration abatement system 5, middle temperature smoke evaporative waste water system 6 and the high-temperature flue gas evaporating waste water system for connecing
7；
The low-temperature flue gas evaporating waste water concentration abatement system includes：Low-temperature flue gas system 8, evaporation decrement tower 9 and low temperature
Waste water spray system 10；The low-temperature flue gas system, evaporation decrement tower and waste water spray system are connected with each other, and low-temperature flue gas pass through
Evaporation decrement tower side lower part enters evaporation decrement tower and is discharged by top, and the nozzle of waste water Jing waste water spray systems is in evaporation decrement tower
Top Jet with downward flow direction, with low-temperature flue gas counter current contacting concentration is evaporated；
The middle temperature smoke evaporative waste water system includes：Middle temperature evaporation flue 11, waste water spray system 12 and soot blower 13；
The waste water spray spout of the middle temperature smoke evaporative waste water system is arranged in middle temperature evaporation flue upstream, waste water injection direction and cigarette
Air-flow is to consistent；Soot blower is arranged in middle temperature evaporation flue downstream；
The high-temperature flue gas evaporating waste water system includes：High-temperature flue gas system 14, high temperature evaporation tower 15, waste water spray system
16 and soot blower 17；The high-temperature flue gas system, high temperature evaporation tower, waste water spray system and soot blower are connected with each other；The height
Warm flue gas is discharged by high temperature evaporation top of tower into bottom, and waste water arrangement of nozzles is in high temperature evaporation tower middle and upper part, waste water injection side
To consistent with flue gas flow direction, soot blower is arranged in high temperature evaporation tower middle and lower part；
The waste water is respectively fed to middle temperature smoke evaporative after low-temperature flue gas evaporating waste water concentration abatement system concentration decrement
System and high-temperature flue gas vapo(u)rization system evaporate all waste water.
The flue gas of the low-temperature flue gas system is taken from the flue between electrostatic precipitator and desulfurizing tower, sets on the flue
It is equipped with air-introduced machine 18；Wherein, it is low-temperature flue gas intake near air-introduced machine outlet, is low-temperature flue gas refluxing opening near desulfurizing tower；
The flue-gas temperature of the low-temperature flue gas system is 50-120 DEG C.
The middle temperature flue gas of the middle temperature evaporation flue is taken from the flue between air preheater and electrostatic precipitator；It is described
Middle temperature flue-gas temperature in middle temperature evaporation flue is 120-145 DEG C.
High-temperature flue gas in the high-temperature flue gas system are taken from the flue between boiler economizer and air preheater, institute
It is 300-400 DEG C to state the high-temperature flue-gas in high-temperature flue gas system.
The low-temperature flue gas evaporating waste water concentration abatement system, middle temperature smoke evaporative waste water system and high-temperature flue gas evaporation are useless
Waste water in water system is above-mentioned both from same waste water tank 19, waste water tank and evaporation decrement tower (9) and concentration flow container (20)
It is useless in low-temperature flue gas evaporating waste water concentration abatement system, middle temperature smoke evaporative waste water system and high-temperature flue gas evaporating waste water system
Water sprinkler system is connected by spray pump 21,22 with concentration flow container；The concentration flow container is by slurry excavationg pump and solid-liquid point
It is connected from device 23, the solid after solid-liquid separator is separated is discharged to sludge treating system 24；Through solid-liquid separator point
Liquid after is back in concentration flow container.
The solid-liquid separator includes filter press device or belt filter press；The low-temperature flue gas evaporating waste water concentration subtracts
Waste water spray system in amount system, middle temperature smoke evaporative waste water system and high-temperature flue gas evaporating waste water system is also provided with useless
Hydraulic pressure power transmitter, waste water adjust door, waste water cut-off gate and waste water stream gauge, and the said equipment is connected with each other；Waste water adjust door and
Waste water cut-off gate is separately positioned on waste water transfer pipeline.
The waste water spray system of middle temperature smoke evaporative system also includes air interception door, air regulating door and is connected with each other
Atomizing air pipeline, mass air flow sensor, air pressure transmitter, air compressor；The high-temperature flue gas evaporate spray system
Also include air atomizer spray nozzle, high temperature evaporation tower, atomizing air pipeline, air interception door, the air adjustment being connected with each other successively
Door, mass air flow sensor, air pressure transmitter；The high temperature evaporation tower is connected with soot blower.
Low-temperature flue gas system includes that flue entrance cut-off gate, flue entrance adjust door, ducting outlet cut-off gate, pressure inverting
Device, thermocouple, effusion meter, flue entrance cut-off gate and flue entrance adjust door and are arranged at low-temperature flue gas intake；Air channel goes out
Mouth adjusts door and ducting outlet cut-off gate is arranged at low-temperature flue gas refluxing opening, pressure transmitter, thermocouple and effusion meter difference
It is arranged in the flue between electrostatic precipitator and desulfurizing tower.
The control system is additionally included in line monitoring system, the online monitoring system include being arranged on boiler economizer,
Temperature sensor between air preheater, electrostatic precipitator and desulfurizing tower in flue, to be arranged on low-temperature flue gas evaporating waste water dense
The flow in waste water spray system in reduction system, middle temperature smoke evaporative waste water system and high-temperature flue gas evaporating waste water system
Sensor and the industrial computer of flow control valve and remote monitoring room, the industrial computer respectively with the temperature sensor, flow
Sensor, flow control valve are connected；Industrial computer is according to temperature sensor and the real-time monitoring data of flow transducer, controlling stream
The Flow-rate adjustment value of adjustable valve.
A kind of above-mentioned control method of full load gradient fume afterheat evaporating waste water control system of the present invention includes following step
Suddenly：
1) in the flue between electrostatic precipitator and desulfurizing tower, extract by using on the air-introduced machine of low-temperature flue gas system
120 DEG C of flue gases of a part send into the side lower part of evaporation decrement tower, and flue gas returns electrostatic and removes after evaporation decrement tower from the bottom to top
Flue between dirt device and desulfurizing tower, using being arranged on some waste water nozzles of evaporation decrement tower top waste water spray system in tower
Interior Jet with downward flow direction, is evaporated concentration process, during waste water is transported to Jing after many times circulate decrement with low-temperature flue gas counter current contacting
Warm smoke evaporative system and high-temperature flue gas vapo(u)rization system；
2) control system controls respectively middle temperature smoke evaporative according to boiler load and the temperature of flue gas in flue by valve
The waste water straying quatity of the waste water spray system of system and high-temperature flue gas vapo(u)rization system；When boiler load is that high load capacity and middle temperature are evaporated
Flue gas heightens the spray of the waste water spray system of middle temperature smoke evaporative system and high-temperature flue gas vapo(u)rization system at 120 DEG C -145 DEG C
Enter amount；When boiler load is underload and middle temperature evaporates flue-gas temperature below 120 DEG C, middle temperature smoke evaporative system is closed
Waste water spray system, opens the waste water spray system of high-temperature flue gas vapo(u)rization system, and waste water is sprayed into into high-temperature flue gas vapo(u)rization system, fills
Divide and realize the most economical method of operation, i.e. wastewater zero discharge using flue gas gradient temperature.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using this
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without through performing creative labour.Therefore, the invention is not restricted to enforcement here
Example, those skilled in the art's announcement of the invention, the improvement made without departing from scope and modification all should be
Within protection scope of the present invention.
Claims (10)
1. a kind of full load gradient fume afterheat evaporating waste water control system, it is characterised in that：
Boiler economizer (1) that the control system includes being sequentially connected by flue, air preheater (2), electrostatic precipitator (3) and
Desulfurizing tower (4), the control system also includes the low-temperature flue gas evaporating waste water concentration abatement system being connected with each other with above-mentioned flue
(5), middle temperature smoke evaporative waste water system (6) and high-temperature flue gas evaporating waste water system (7)；
The low-temperature flue gas evaporating waste water concentration abatement system includes：Low-temperature flue gas system (8), evaporation decrement tower (9) and low temperature
Waste water spray system (10)；The low-temperature flue gas system, evaporation decrement tower and waste water spray system are connected with each other, and low-temperature flue gas lead to
Pervaporation decrement tower side lower part enters evaporation decrement tower and is discharged by top, and the nozzle of waste water Jing waste water spray systems is in evaporation decrement
Tower top Jet with downward flow direction, with low-temperature flue gas counter current contacting concentration is evaporated；
The middle temperature smoke evaporative waste water system includes：Middle temperature evaporation flue (11), waste water spray system (12) and soot blower
(13)；The waste water spray spout of the middle temperature smoke evaporative waste water system is arranged in middle temperature evaporation flue upstream, waste water injection side
To consistent with flue gas flow direction；Soot blower is arranged in middle temperature evaporation flue downstream；
The high-temperature flue gas evaporating waste water system includes：High-temperature flue gas system (14), high temperature evaporation tower (15), waste water spray system
And soot blower (17) (16)；The high-temperature flue gas system, high temperature evaporation tower, waste water spray system and soot blower are connected with each other；Institute
State high-temperature flue gas to be discharged into bottom by high temperature evaporation top of tower, waste water arrangement of nozzles is in high temperature evaporation tower middle and upper part, waste water spray
Penetrate direction consistent with flue gas flow direction, soot blower is arranged in high temperature evaporation tower middle and lower part；
The waste water is respectively fed to middle temperature smoke evaporative system after low-temperature flue gas evaporating waste water concentration abatement system concentration decrement
And high-temperature flue gas vapo(u)rization system evaporates all waste water.
2. a kind of full load gradient fume afterheat evaporating waste water control system according to claim 1, it is characterised in that：Institute
The flue that the flue gas of low-temperature flue gas system is taken between electrostatic precipitator and desulfurizing tower is stated, on the flue air-introduced machine is provided with
(18)；Wherein, it is low-temperature flue gas intake near air-introduced machine outlet, is low-temperature flue gas refluxing opening near desulfurizing tower；The low temperature
The flue-gas temperature of flue gas system is 50-120 DEG C.
3. a kind of full load gradient fume afterheat evaporating waste water control system according to claim 2, it is characterised in that：Institute
In stating the flue that the warm middle temperature flue gas for evaporating flue is taken between air preheater and electrostatic precipitator；The middle temperature evaporates cigarette
Middle temperature flue-gas temperature in road is 120-145 DEG C.
4. a kind of full load gradient fume afterheat evaporating waste water control system according to claim 3, it is characterised in that：Institute
In stating the flue that the high-temperature flue gas in high-temperature flue gas system are taken between boiler economizer and air preheater, the high-temperature flue gas
High-temperature flue-gas in system are 300-400 DEG C.
5. a kind of full load gradient fume afterheat evaporating waste water control system according to claim 1, it is characterised in that：Institute
In stating low-temperature flue gas evaporating waste water concentration abatement system, middle temperature smoke evaporative waste water system and high-temperature flue gas evaporating waste water system
Waste water is both from same waste water tank (19), and waste water tank is connected with evaporation decrement tower (9) and concentration flow container (20), above-mentioned low
Waste water in warm smoke evaporative Waste water concentrating abatement system, middle temperature smoke evaporative waste water system and high-temperature flue gas evaporating waste water system
Spray system is connected by spray pump (21,22) with concentration flow container；The concentration flow container is by slurry excavationg pump and solid-liquid point
It is connected from device (23), the solid after solid-liquid separator is separated is discharged to sludge treating system (24)；Through solid-liquid separation
Liquid after device is separated is back in concentration flow container.
6. a kind of full load gradient fume afterheat evaporating waste water control system according to claim 5, it is characterised in that：Institute
Solid-liquid separator is stated including filter press device or belt filter press；Low-temperature flue gas evaporating waste water concentration abatement system, in
Waste water spray system in warm smoke evaporative waste water system and high-temperature flue gas evaporating waste water system is also provided with wastewater pressure change
Device, waste water is sent to adjust door, waste water cut-off gate and waste water stream gauge, the said equipment is connected with each other；Waste water adjusts door and waste water cut-off
Door is separately positioned on waste water transfer pipeline.
7. a kind of full load gradient fume afterheat evaporating waste water control system according to claim 6, it is characterised in that：In
The waste water spray system of warm smoke evaporative system also includes air interception door, air regulating door and the atomizing air being connected with each other
Pipeline, mass air flow sensor, air pressure transmitter, air compressor；The high-temperature flue gas evaporation spray system is also included successively
Air atomizer spray nozzle, high temperature evaporation tower, atomizing air pipeline, air interception door, air regulating door, the air mass flow being connected with each other
Meter, air pressure transmitter；The high temperature evaporation tower is connected with soot blower.
8. a kind of full load gradient fume afterheat evaporating waste water control system according to claim 2, it is characterised in that：It is low
Warm flue gas system include flue entrance cut-off gate, flue entrance adjust door, ducting outlet cut-off gate, pressure transmitter, thermocouple,
Effusion meter, flue entrance cut-off gate and flue entrance adjust door and are arranged at low-temperature flue gas intake；Ducting outlet cut-off gate sets
Put in low-temperature flue gas refluxing opening, pressure transmitter, thermocouple and effusion meter are separately positioned between electrostatic precipitator and desulfurizing tower
Flue in.
9. a kind of full load gradient fume afterheat evaporating waste water control system according to any one of claim 1-8, it is special
Levy and be：The control system is additionally included in line monitoring system, and the online monitoring system includes being arranged on boiler economizer, sky
Temperature sensor between air preheater, electrostatic precipitator and desulfurizing tower in flue, it is arranged on the concentration of low-temperature flue gas evaporating waste water
Flow in waste water spray system in abatement system, middle temperature smoke evaporative waste water system and high-temperature flue gas evaporating waste water system is passed
Sensor and the industrial computer of flow control valve and remote monitoring room, the industrial computer is passed respectively with the temperature sensor, flow
Sensor, flow control valve are connected；Industrial computer controls flow according to temperature sensor and the real-time monitoring data of flow transducer
The Flow-rate adjustment value of regulating valve.
10. a kind of a kind of full load gradient fume afterheat evaporating waste water control system according to any one of claim 1-9
Control method, the control method comprises the steps：
1) in the flue between electrostatic precipitator and desulfurizing tower, by using extraction one on the air-introduced machine of low-temperature flue gas system
Point low-temperature flue gas send into the side lower part of evaporation decrement tower, flue gas from the bottom to top by return after evaporation decrement tower electrostatic precipitator and
Flue between desulfurizing tower, it is downward in tower using some waste water nozzles for being arranged on evaporation decrement tower top waste water spray system
Injection, with low-temperature flue gas counter current contacting concentration process is evaporated, and waste water is transported to middle temperature flue gas Jing after many times circulate decrement
Vapo(u)rization system and high-temperature flue gas vapo(u)rization system；
2) control system controls respectively middle temperature smoke evaporative system according to boiler load and the temperature of flue gas in flue by valve
With the waste water straying quatity of the waste water spray system of high-temperature flue gas vapo(u)rization system；When boiler load is high load capacity and middle temperature evaporation flue gas
At 120 DEG C -145 DEG C, the straying quatity of the waste water spray system of middle temperature smoke evaporative system and high-temperature flue gas vapo(u)rization system is heightened；
When boiler load is underload and middle temperature evaporates flue-gas temperature below 120 DEG C, the waste water of middle temperature smoke evaporative system is closed
Spray system, opens the waste water spray system of high-temperature flue gas vapo(u)rization system, and waste water is sprayed into into high-temperature flue gas vapo(u)rization system, fully profit
The most economical method of operation, i.e. wastewater zero discharge are realized with flue gas gradient temperature.
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