CN107952365A - A kind of high-temperature flue gas evaporation desulfurizing waste water processing device and its processing method - Google Patents
A kind of high-temperature flue gas evaporation desulfurizing waste water processing device and its processing method Download PDFInfo
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- CN107952365A CN107952365A CN201711247906.3A CN201711247906A CN107952365A CN 107952365 A CN107952365 A CN 107952365A CN 201711247906 A CN201711247906 A CN 201711247906A CN 107952365 A CN107952365 A CN 107952365A
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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
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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
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
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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
- B01D53/73—After-treatment of removed components
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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
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/017—Combinations of electrostatic separation with other processes, not otherwise provided for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
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- 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
Abstract
The invention discloses a kind of high-temperature flue gas evaporation desulfurizing waste water processing device and its processing method, belong to field of industrial waste water treatment, including sequentially connected SCR catalytic denitrations system, air preheater, electric precipitator, air-introduced machine, wet desulphurization absorption tower, chimney, wet desulphurization absorption tower bottom connects desulfurization wastewater liquid reserve tank, desulfurization wastewater liquid reserve tank is connected to the water inlet at the top of evaporating column by water pump, one big flow air inlet and small flow air inlet are set respectively at the top and bottom of evaporating column, described two air inlets export with gas diverter connect respectively, the gas diverter entrance respectively with air-introduced machine, flue connection between SCR catalytic denitrations system and air preheater, gas outlet is provided with the middle part of evaporating column to connect by the flue between outlet pipe and air preheater and electric precipitator.The present invention improves evaporation effect, saves energy consumption, reduces the content of evaporating column outlet gaseous state chlorine element, is conducive to the safe and stable operation of follow-up equipment.
Description
Technical field
The present invention relates to field of industrial waste water treatment, especially a kind of desulfurizing waste water processing device and its processing method.
Background technology
Wet limestone-gypsum FGD technique has desulfuration efficiency height, skill as current coal-burning power plant's mainstream desulfurization technology
Art is ripe, it is stable and easy to maintain the advantages that, but in order to maintain the reliable and stable operation of serum recycle system, it is necessary to periodically arrange
Put a certain amount of desulfurization wastewater.What in June, 2017 formally came into effect《Thermal power plant's prevention and cure of pollution possible technique guide》Clearly carry
Go out, in addition to desulfurization wastewater, all kinds of waste water are basic after processing to realize the not outer row of " multi-purpose water, cascade utilization ", waste water, realize
The key of waste water near-zero release is to realize desulfurization wastewater zero-emission.But desulfurization wastewater is power plant's terminal waste water, by many factors shadow
Ring, and influenced greatly with operating mode and coal；PH is high in faintly acid, chloride ion content between 4.5-6.5；With gypsum particle, dioxy
SiClx, iron aluminide is higher for the suspension content of main component, and it is dirty stifled to easily cause film filter；Total dissolved solid contains
Amount is higher, and excursion is big, generally high in the hardness ions such as 30000-60000 mg/L, Ca2+ and Mg2+ content, mercury, lead,
The Ith pollutant of the heavy metals such as arsenic is exceeded.Currently used conventional physical chemical desulfurization wastewater treatment method, is only capable of removing big portion
The heavy metal ion divided, but the stronger chlorion of migration can not be removed.Since desulfurization wastewater water is big, either evaporative crystallization
Or flue evaporation is required for carrying out decrement concentration before treatment, technological process is elongated, flue is evaporated then by wastewater treatment pressure
Power is transferred to electric precipitator.
Desulfurization wastewater and its reluctant present situation for water quality complexity, in Patent No. CN201611057906.2
State's patent discloses a kind of power plant desulfurization wastewater dechloratation method, is divided desulfurization wastewater using electrodialysis and bipolar membrane device
Recycling processing is carried out respectively for three calcium sulfate, sodium chloride and calcium chloride circuits；Patent No.
The Chinese patent of CN201510275955.2 discloses a kind of desulfurization wastewater technique of zero discharge and system, using dosing softening and
Microfiltration membranes are pre-processed, and using nanofiltration and reverse osmosis separation, freezing and crystallizing separates out ten hydrated sulfuric acids of more than 99% purity
Sodium, evaporative crystallization separate out 98% purity sodium chloride, additionally provide it is a kind of can be by the Zero discharging system of desulfurization wastewater reuse；Specially
Profit number discloses a kind of system of desulfurization wastewater concentration and flue gas drying integrated treatment for 201611008084.9 Chinese patent
With method, by desulfurization wastewater after traditional three headers processing, concentrated using evaporator, the water reuse bypass flue cigarette after concentration
Gas heat completes evaporative crystallization, and air-flow is discharged after dedusting from chimney.Above method all recognizes the difficulty of desulfurization wastewater processing
Property, the process route crystallized is combined by electrodialysis and film process, or the route that flue directly evaporates gives up to handle desulfurization
Water.But desulfurization wastewater is handled by the method for evaporative crystallization, to realize it is higher divide salt requirement, often energy consumption is higher, economical
Cost is excessive；And flue evaporation is unable to reach the requirement of power plant desulfurization wastewater treating capacity on the one hand there are treating capacity is too low；The opposing party
Face deposit at low load can not evaporating completely desulfurization wastewater the problem of, flue and follow-up cleaner can be caused to corrode, shadow
Ring boiler operatiopn.The Chinese patent of number of patent application 201520773601.6 is disclosed at a kind of coal fired power plant flue gas desulfurization waste water
Reason system, including air preheater, electric precipitator, fume desulfurating absorption tower, air-introduced machine and chimney, air preheater front end connect
Boiler exhaust gas pipeline is connect, is passed through between air preheater rear end and electric precipitator, fume desulfurating absorption tower, air-introduced machine and chimney
Flue is sequentially connected, and further includes waste water liquid storage tank, waste water evaporating column, and waste water liquid storage tank receives fume desulfurating absorption tower discharge
Waste water, the water inlet of waste water evaporating column passes through inlet channel and connects waste water tank, and water pump, waste water are set among inlet channel
The air inlet of evaporating column is connected through wind turbine, solenoid valve with the smoke discharging pipe of boiler successively all the way, and another way is pre- with air through wind turbine
Flue connection between hot device and electric precipitator, connectivity part are located at close to one end of air preheater, its exhaust outlet and sky
Flue connection between air preheater and electric precipitator, and positioned at close to one end of electric precipitator.Setting in this patent
For some solved the problems, such as in three patents of the above but still it is not especially desirable, waste water evaporating column bottom there are evaporation effect
Easily there is water droplet in the ash bucket in portion.Therefore, it is necessary to set dedicated evaporation tower to handle desulfurization wastewater, to realize real desulfurization wastewater
Zero-emission.
The content of the invention
The technical problem to be solved in the invention is to provide a kind of high-temperature flue gas evaporation desulfurizing waste water processing device and its place
Reason method, improves evaporation effect, saves energy consumption, reduces the content of evaporating column outlet gaseous state chlorine element, is conducive to follow-up equipment
Safe and stable operation.
In order to solve the above technical problems, the technical solution adopted in the present invention is：
A kind of high-temperature flue gas evaporates desulfurizing waste water processing device, including sequentially connected SCR catalytic denitrations system, air preheat
Device, electric precipitator, air-introduced machine, wet desulphurization absorption tower, chimney, wet desulphurization absorption tower bottom connection desulfurization wastewater liquid reserve tank,
Desulfurization wastewater liquid reserve tank is connected to the water inlet at the top of evaporating column by water pump, is set respectively at the top and bottom of evaporating column one big
Flow air inlet and small flow air inlet, described two air inlets export with gas diverter connect respectively, the gas distribution
Flue of the device entrance respectively between air-introduced machine, SCR catalytic denitrations system and air preheater is connected, and is provided with the middle part of evaporating column
Gas outlet is connected by the flue between outlet pipe and air preheater and electric precipitator.
Technical solution of the present invention further improvement lies in that：The gas diverter will enter the flue gas point of gas diverter
For the different flue gas of two plume amounts, one flue gas for accounting for total flue gas 70% enters at the top of evaporating column, with desulfurization wastewater droplet cocurrent
Contact heat-shift；The flue gas that another burst of exhaust gas volumn accounts for 30% enters from evaporation tower bottom, is handed over desulfurization wastewater droplet counter current contacting
Heat exchange amount.
Technical solution of the present invention further improvement lies in that：Rotary atomizer, rotary mist are set in the evaporating column
Change device to control the average grain diameter of desulfurization wastewater droplet between 50 μm -100 μm.
Technical solution of the present invention further improvement lies in that：The evaporating column bottom air inlet upper end is equipped with blast cap, taper
Bottom is equipped with ash bucket.
Technical solution of the present invention further improvement lies in that：The gas diverter entrance is respectively by being evacuated secondary duct B
It is connected with air-introduced machine, is connected by the flue being evacuated between secondary duct A and SCR catalytic denitration system and air preheater, it is described
Gas separator is connected, by air inlet secondary duct B and evaporating column bottom by air inlet secondary duct A with air inlet at the top of evaporating column respectively
Portion's air inlet connection, the air inlet secondary duct A and air inlet secondary duct B ends are respectively provided with flow sensor and temperature sensor, institute
State to be provided with pumping secondary duct B on flow control valve B, the pumping secondary duct A and be provided with flow control valve A, outlet pipe
Upper set temperature sensor, water pump are connected with the top of evaporating column by inlet channel, set online water to detect in inlet channel
Equipment and temperature sensor, further include operation control center, the operation control center and water pump, flow sensor, Ge Gewen
Spend sensor, flow control valve A, flow control valve B, the connection of online water detection device.
Technical solution of the present invention further improvement lies in that：The electric precipitator front end sets monitoring input gas temperature
Temperature monitoring, temperature monitoring are connected with operation control center.
A kind of high-temperature flue gas evaporates method for treating desulfurized wastewater, by the slurries of wet desulphurization absorption tower discharge through gypsum dehydration
Supernatant liquor is sent into evaporating column after processing, the flue gas mixing of two kinds of different temperatures is extracted from the smoke evacuation system at boiler rear portion
It is divided into the different air-flow of two plume amounts afterwards and each leads at the top of evaporating column and lower part with importing the supernatant liquor progress in evaporating column
Streaming contact is mixed, the steam that evaporating column desulfurization produces is discharged from gas outlet at the top of evaporating column, powder or particulate matter after being evaporated
Drop in the ash bucket of evaporation tower bottom.
The processing method of technical solution of the present invention further improvement lies in that：Specifically include following steps：
A, the slurries of wet desulphurization absorption tower discharge produce gypsum by gypsum dehydration system, and the waste water of generation enters desulfurization wastewater
Liquid reserve tank, stands natural subsidence for a period of time；
B, extracts desulfurization wastewater liquid reserve tank supernatant liquor using water pump and send to evaporating column rotary-top formula atomizer water inlet, desulfurization
Waste water is sent in the high speed rotating disk of rotary atomizer, and the centrifugal action of rotating disk is atomized desulfurization wastewater, is taken off after atomization
The form of sulphur waste water droplet rotate at high speed is from evaporating column top spray；
C, extracts part high-temperature flue gas, from the cigarette after air-introduced machine from the flue between SCR catalytic denitrations system and air preheater
A certain amount of low temperature neat stress is drawn in road, and two plume amounts are divided into after high-temperature flue gas and low-temperature flue gas are converged in gas diverter
Different air-flows, one flue gas enter at the top of evaporating column, are connect with the droplet cocurrent after desulfurization wastewater swirling flow atomizing in evaporating column
Touch；Another strand of flue gas enters from evaporation tower bottom, and increases with the relatively rear heat exchange area of blast cap 13, with desulfurization wastewater in evaporating column
Droplet counter current contacting after swirling flow atomizing；
D, steam after desulfurization wastewater atomization after the evaporation of droplet hygroscopic water with cooling flue gas at the top of the evaporating column gas outlet through air outlet pipe
Road is discharged into electric precipitator, after desulfurization wastewater evaporation in steam pollutant together with the dust in former flue gas in electric precipitator
It is removed；
E, powder or particulate matter after being evaporated are dropped in the ash bucket of evaporation tower bottom, transported to grey field integrated application.
The processing method of technical solution of the present invention further improvement lies in that：By controlling rotation type atomization in the step b
Device rotary speed controls mist droplet particle size between 50 μm to 100 μm.
By adopting the above-described technical solution, the technological progress that the present invention obtains is：
The present invention proposes a kind of high-temperature flue gas evaporation desulfurizing waste water processing device and its processing method with mixed gas system, leads to
The mixed flow formula way of contact is crossed, drastically increases evaporation effect.One low temperature neat stress is drawn from the flue after air-introduced machine, with
Heat smoke blends before air preheater, reduces evaporating column entrance flue gas temperature, it can be achieved that low-temperature evaporation, can not only save energy consumption, but also
The content of evaporating column outlet gaseous state chlorine element can be reduced, is conducive to the safe and stable operation of follow-up equipment.
The present invention sets evaporating column, can effectively prevent the corrosion to flue in desulfurization wastewater evaporation process, is high-temperature flue gas
Droplet provides fully big space after evaporation desulfurization wastewater atomization, so as to improve the residence time of droplet, improves evaporation effect
Fruit.
Blast cap is set above evaporating column bottom air inlet, gas liquid interfacial area can not only be increased, improves evaporation effect；Steam
Dried powder or particle after hair can be subject to the barrier of blast cap and fall in the ash bucket of bottom of towe, be convenient to clean.
Operation control center is independently arranged, and flue is equipped with temperature monitoring before electric precipitator, can be removed for monitoring electricity
The flue-gas temperature of dirt device import, by the temperature control more than the acid dew point of flue gas, acid therein when avoiding flue gas too low
Matter condenses, and electric precipitator and flue are caused to corrode.
Air-introduced machine is arranged on electric precipitator rear, avoids deduster from being under high dirt, high humidity, homadamon border, to air inducing
Machine plays a protective role, and is also greatly improved system operation reliability and flexible adjustment.
Brief description of the drawings
Fig. 1 is structure principle chart of the present invention；
Wherein, 1, boiler, 2, SCR catalytic denitration systems, 3, air preheater, 4, electric precipitator, 5, air-introduced machine, 6, wet desulphurization
Absorption tower, 7, chimney, 8, gypsum dehydration system, 9, desulfurization wastewater liquid reserve tank, 10, water pump, 11, evaporating column, 12, rotation type atomization
Device, 13, blast cap, 14, ash bucket, 15, Hui Chang, 16, gas diverter, 17, flow control valve A, 18, temperature monitoring, 19, flow
Control valve B, 20, pumping secondary duct A, 21, pumping secondary duct B, 23, air inlet secondary duct A, 24, air inlet secondary duct B, 25, air outlet pipe
Road, 26, inlet channel.
Embodiment
The present invention is described in further details with reference to embodiment：
As shown in Figure 1, a kind of high-temperature flue gas evaporation desulfurizing waste water processing device, including sequentially connected SCR catalytic denitrations system
2nd, air preheater 3, electric precipitator 4, air-introduced machine 5, wet desulphurization absorption tower 6, chimney 7,2 front end of SCR catalytic denitrations system connect
Connect 1 flue of boiler, 6 bottom connection gypsum dehydration system 8 of rear end 3 wet desulphurization absorption tower of connection air preheater and desulfurization wastewater
Liquid reserve tank 9, water pump 10 is connected after desulfurization wastewater liquid reserve tank 9, the water inlet at the top of evaporating column 11 is connected to by inlet channel 26
Mouthful.Rotary atomizer 12 is set in evaporating column 11, desulfurization wastewater atomization is easy to evaporation for subparticle.
The top and bottom of evaporating column 11 set a big flow air inlet and small flow air inlet, gas separator 16 respectively
It is connected respectively by air inlet secondary duct A23 with 11 top air inlet of evaporating column, by 11 bottom of air inlet secondary duct B24 and evaporating column
Air inlet connects, and air inlet secondary duct A23 and air inlet secondary duct B24 ends are respectively provided with flow sensor and temperature sensor.Gas
16 entrance of current divider is connected by being evacuated secondary duct B21 with air-introduced machine 5, by being evacuated secondary duct A20 and SCR catalytic denitration respectively
Flue connection between system 2 and air preheater 3, is evacuated on secondary duct B21 and is provided with flow control valve B19, be evacuated looped pipeline
Flow control valve A17 is provided with road A20.11 top of evaporating column is provided with gas outlet and passes through outlet pipe 25 and air preheater
Flue between 3 and electric precipitator 4 connects, set temperature sensor on outlet pipe 25.
It is a certain amount of by the flue being evacuated between secondary duct A20 extraction SCR catalytic denitrations system 2 and air preheater 3
Exhaust gas volumn is extracted in flue gas, flow control valve A17 controls；5 rear pass part cigarette of air-introduced machine is extracted by being evacuated secondary duct B21
Gas, flow control valve B19 controls institute smoking tolerance.The two strands of flue gases extracted converge in gas diverter 16, gas diverter
The flue gas converged is divided into the different flue gas of two plume amounts by 16, one flue gas for accounting for total flue gas 70% enters from the top of evaporating column 1,
With desulfurization wastewater droplet current contacting heat-shift；The flue gas that another burst of exhaust gas volumn accounts for 30% enters from 11 bottom of evaporating column, with taking off
Sulphur waste water droplet counter current contacting heat-shift.Evaporating column 11 by outlet pipe 25 connect air preheater 3 and electric precipitator 4 it
Between flue, and close to 4 side of electric precipitator.The gas outlet of evaporating column 11 is arranged in the middle part of tower body direct tube section, it is ensured that from
The flue gas that evaporating column top and bottom enters has sufficient heat transfer space and residence time.
11 bottom air inlet upper end of evaporating column is equipped with blast cap 13, and conical lower portion is equipped with ash bucket 14, from 11 bottom of evaporating column into
The flue gas entered is spread by being obstructed after blast cap 13 to surrounding, is increased with droplet contact area, after evaporation dry powder or
It is granular stopped by blast cap 13 can also drop in ash bucket 14.
Evaporating column is automatically controlled in order to realize, operation control center is independently arranged outside the device, in air inlet secondary duct
A23 and air inlet secondary duct B24 ends set flue gas flow sensor and temperature sensor, 25 front ends of outlet pipe, that is, evaporating column 11
Gas outlet set temperature sensor, sets online water detection device and temperature sensor, operation control in inlet channel 26
Center and flow sensor, each temperature sensor, flow control valve B19, flow control valve A17, online water detection device
Linkage record parameter is directly uploaded to operation control center, after computing and judgement, operation control center control flow control valve
The desulfurization wastewater amount of the extraction of A17, flow control valve B19 and water pump 10, reaches and automatically controls purpose.
In order to control the flue-gas temperature of 4 import of electric precipitator, 4 front end of electric precipitator sets input gas temperature monitor
18, for monitoring the temperature of electric precipitator import, cigarette is avoided more than flue gas acid dew point all the time during guarantee flue-gas temperature operation
Acidic materials when temperature is too low in flue gas condense, and flue and electric precipitator 4 are caused to corrode.
When the water capacity for being evaporated product collected in ash bucket 14 exceedes set quota, illustrate desulfurization wastewater in evaporating column 11
Evaporation is not thorough, and can be fed back by the automatic adjustment at operation control center, the aperture of control flow control valve A17, quantitative to increase
The smoke heat energy into evaporating column 11 is added, the desulfurization wastewater amount that water pump 10 can also be controlled to extract, reduces water spray, two kinds of sides
Formula can ensure that waste water evaporation is thorough.
Monitor flue-gas temperature before electric precipitator in real time by temperature monitoring 18, by the flue-gas temperature of monitoring and acid dew point into
Row compares, and automatically controls flue-gas temperature and is higher than more than 10 DEG C of acid dew point, if flue-gas temperature is higher than more than 10 DEG C of acid dew point, computing
Control centre 27 reduces the aperture of flow control valve A17, while increases flow control valve B19 apertures, to reduce evaporating column entrance
Smoke temperature, it is therefore an objective to reduce the content that evaporating column 11 exports gaseous state chlorine element as far as possible, water pump 10 can also be increased in addition and extracted
Desulfurization wastewater amount, to increase desulfurization wastewater treating capacity；If flue-gas temperature is less than "+10 DEG C of flue gas acid dew point " before electric precipitator 4,
Then the desulfurization wastewater amount of the extraction of water pump 10 is reduced at operation control center 27 automatically, then compares flue-gas temperature and " cigarette before electric precipitator 4
+ 10 DEG C of gas acid dew point ", if still relatively low, operation control center 27 increases the aperture of flow control valve A17, ensures electric precipitation
Flue-gas temperature is more than flue gas acid dew point before device 4, prevents flue gas middle acid substance condenses from causing to corrode to flue and electric precipitator 4.
In conclusion the slurries that wet desulphurization absorption tower 6 is discharged produce desulfurization wastewater after the dehydration of gypsum dehydration system 8,
After being stored in desulfurization wastewater liquid reserve tank 9 natural subsidence for a period of time, water pump 10 is utilized to extract supernatant liquor to rotation type atomization
Desulfurization wastewater is atomized as 50 μm to 100 μm by 12 water inlet of device, the centrifugal action of 12 high speed rotating disk of rotary atomizer
Droplet, is contacted with the flue gas of extraction in a manner of mixed flow, carries out strong mass-and heat-transfer process, and the hygroscopic water in desulfurization wastewater is fast
With flue gas enter electric precipitator 4 after speed evaporation, be evaporated product and be collected in after ash bucket 14 and be transported to grey field 15 and comprehensively utilize.
The method that high-temperature flue gas evaporation desulfurization wastewater processing is carried out using above device, is comprised the following steps：
1) slurries that wet desulphurization absorption tower 6 is discharged produce gypsum by gypsum dehydration system 8, and the waste water of generation enters desulfurization
Waste water liquid reserve tank 9, stands natural subsidence for a period of time；
2) 9 supernatant liquor of desulfurization wastewater liquid reserve tank is extracted using water pump 10, the rotation of the top of evaporating column 11 is transported to from inlet channel 26
Rotatable 12 water inlet of atomizer, desulfurization wastewater are sent in the high speed rotating disk of atomizer, and the centrifugal action of rotating disk makes desulfurization
Waste water is atomized, and the form of desulfurization wastewater droplet rotate at high speed passes through and controls rotation speed from 11 top spray of evaporating column after atomization
Degree is by mist droplet particle size control between 50 μm to 100 μm；
3) part high-temperature flue gas is extracted from the flue between SCR catalytic denitrations system 2 and air preheater 3, passes through flow control
The flue gas flow that valve A17 controls are extracted, then a certain amount of low temperature neat stress is drawn from the flue after air-introduced machine 5, flow passes through stream
Control valve B19 is controlled, from pumping secondary duct A20 and the different temperatures flue gas for being evacuated secondary duct B21 extractions in gas diverter
It is divided into the different air-flow of two plume amounts after converging in 16, one flue gas is entered by air inlet secondary duct A23 from the top of evaporating column 11,
With the droplet current contacting after desulfurization wastewater swirling flow atomizing in evaporating column 11；Another strand of flue gas is by air inlet secondary duct B24 from steaming
Send out 11 bottom of tower to enter, increased by heat exchange area after blast cap 13, with the droplet after desulfurization wastewater swirling flow atomizing in evaporating column 11
Counter current contacting.
4) from two strands of flue gases that 11 top and bottom air inlet of evaporating column enters and mist of the desulfurization wastewater after swirling flow atomizing
Drop contact, for gas-liquid two-phase since strong heat exchange occurs for the temperature difference, the droplet after atomization absorbs the heat of flue gas and flash evapn,
Temperature reduces after flue gas release heat, and the steam after desulfurization wastewater atomization after the evaporation of droplet hygroscopic water is with cooling flue gas from evaporating column 11
Top gas outlet is discharged through outlet pipe 25, enters electric precipitator 4 through the flue between air preheater 3 and electric precipitator 4, is taken off
Pollutant is removed together with the dust in former flue gas in electric precipitator 4 in steam after the evaporation of sulphur waste water.Powder after being evaporated
Or particulate matter is dropped in the ash bucket 14 of 11 bottom of evaporating column, transport to grey 15 integrated application of field.
The present invention operation principle be extract air preheater before and air-introduced machine after flue gas, using flue gas heat with
Desulfurization wastewater carries out heat exchange, and a pollutant part is converted into after steam enters air preheater with cooling flue gas in desulfurization wastewater
Flue is removed by electric precipitator, and another part pollutant is fallen into after being evaporated in evaporating column in the ash bucket of evaporation tower bottom.
(1) heat balance in evaporating column
Desulfurization wastewater receives the heat of two bursts of high-temperature flue gas transmission in evaporating column, is first warming up to 100 DEG C, then absorbs substantial amounts of phase
Heating, is evaporated to 100 DEG C of vapor, and on the premise of heat is enough, waste water is all evaporated, and vapor is continuously heating to steam
Send out tower mixed system temperature.
There are the heat balance of flue gas and desulfurization wastewater in evaporating column, this is the theoretical foundation at operation control center.Each ginseng
Number can be obtained by operation control center or common physical data table, and the Heat balance calculation being evaporated accordingly in tower, is realized
Evaporation process automatically controls.
(2) evaporation process principle
The evaporation process of desulfurization wastewater is broadly divided into three basic process stages in evaporating column：Desulfurization wastewater atomization is droplet；Mist
Drip contact mixing and the flowing with high-temperature flue gas, the i.e. drying of droplet；Evaporate the transfer of product and steam.
The average grain diameter of desulfurization wastewater droplet can be controlled between 50 μm -100 μm, have very big surface after atomization
Product, when being contacted with high-temperature flue gas, moisture evaporation in droplet and obtain the dry products of other parts pollutant.The size of droplet
It is very big with influence of the uniformity coefficient to evaporation effect, if the droplet size sprayed differs, droplet can be caused not to be evaporated completely
Phenomenon.The high speed rotating disk of rotary atomizer makes desulfurization wastewater be stretched to film, the border movement with the speed that increases to disk,
, can be with drop-wise, filiform or film since the peripheral speed of rotating disk is different and desulfurization wastewater treating capacity is different when leaving card
The division atomization of shape form, this can influence the size and uniformity of droplet, and general peripheral velocity is higher, and droplet particles are smaller,
Uniformity is higher.Therefore, atomizer is the critical component in evaporating column, higher to the performance requirement of atomizer.
The drying of droplet is the heat transfer that droplet and high-temperature flue gas carry out in evaporating column, mass transport process, droplet and high temperature cigarette
The way of contact of gas has parallel type, reverse-flow and three kinds of streaming of mixing.The way of contact is to Temperature Distribution in evaporating column, droplet
Movement locus and residence time all have a significant impact.For the parallel type way of contact, the highest heat smoke of temperature and water capacity
Maximum desulfurization wastewater droplet contact, droplet surface temperature is close to evaporating column top entry flue-gas temperature, and hygroscopic water is quick in droplet
Evaporation, heat smoke temperature reduces rapidly, since smoke inlet speed is larger in evaporating column, the time of contact of flue gas and droplet
Relatively short, heat utilization rate is low；For the reverse-flow way of contact, the droplet and the evaporation tower bottom that are sprayed at the top of evaporating column are swarmed
The contact of the heat smoke containing certain humidity come, droplet water capacity is relatively low during contact, and therefore, reverse-flow evaporation rate is compared with parallel type
To be slow.But from the point of view of the operation of whole counter-current process, the average temperature difference and partial pressure difference in counter-current process are larger, the droplet residence time
It is longer, heat and mass is fully carried out easy to high-temperature flue gas and droplet, heat utilization rate is higher；For mixing the streaming way of contact,
By parallel type with it is reverse-flow the two combine, i.e., droplet from evaporating column top down flowing, high-temperature flue gas is divided into two strands, to
Both direction flows, one is with droplet current contacting at the top of the evaporating column, and another strand of heat smoke is from evaporating column bottom centre and mist
Counter current contacting is dripped, according to processing requirement, rationally controls two strands of flue gas flows.This mixed flow combines cocurrent and counter current contacting
Feature, evaporation rate is very fast, and heat utilization ratio is higher.
After droplet drying process, not volatile heavy metal ion and some solubility salts are steamed in desulfurization wastewater
The powder or particulate material for drying are done, falls in the tapered wall of evaporating column and slides into the ash bucket of bottom, periodically row
Grey field comprehensive utilization is transported to after going out；Volatile pollutant enters air preheater rear pass with vapor and flue gas in desulfurization wastewater
In, removed by electric precipitator.
Claims (9)
1. a kind of high-temperature flue gas evaporates desulfurizing waste water processing device, including sequentially connected SCR catalytic denitrations system（2）, air
Preheater（3）, electric precipitator（4）, air-introduced machine（5）, wet desulphurization absorption tower（6）, chimney（7）, wet desulphurization absorption tower（6）Bottom
Portion connects desulfurization wastewater liquid reserve tank（9）, desulfurization wastewater liquid reserve tank（9）Pass through water pump（10）It is connected to evaporating column（11）Top into
The mouth of a river, it is characterised in that：Evaporating column（11）Top and bottom set a big flow air inlet and small flow air inlet, institute respectively
State two air inlets respectively with gas diverter export connect, the gas diverter entrance respectively with air-introduced machine（5）, SCR urges
Change denitrating system（2）And air preheater（3）Between flue connection, evaporating column（11）Middle part is provided with gas outlet and passes through outlet
Pipeline（25）With air preheater（3）And electric precipitator（4）Between flue connection.
A kind of 2. high-temperature flue gas evaporation desulfurizing waste water processing device according to claim 1, it is characterised in that：The gas
Current divider（16）Gas diverter will be entered（16）Flue gas be divided into the different flue gas of two plume amounts, one accounts for total flue gas 70%
Flue gas is from evaporating column（11）Top enters, with desulfurization wastewater droplet current contacting heat-shift；Another burst of exhaust gas volumn accounts for 30% cigarette
Gas is from evaporating column（11）Bottom enters, with desulfurization wastewater droplet counter current contacting heat-shift.
A kind of 3. high-temperature flue gas evaporation desulfurizing waste water processing device according to claim 1, it is characterised in that：The evaporation
Tower（11）Interior setting rotary atomizer（12）, rotary atomizer（12）The average grain diameter of desulfurization wastewater droplet is controlled 50
Between μm -100 μm.
A kind of 4. high-temperature flue gas evaporation desulfurizing waste water processing device according to claim 1, it is characterised in that：The evaporation
Tower（11）Bottom air inlet upper end is equipped with blast cap（13）, conical lower portion is equipped with ash bucket（14）.
A kind of 5. high-temperature flue gas evaporation desulfurizing waste water processing device according to claim 1, it is characterised in that：The gas
Current divider（16）Entrance is respectively by being evacuated secondary duct B（21）With air-introduced machine（5）Connect, by being evacuated secondary duct A（20）With SCR
Catalytic denitration system（2）And air preheater（3）Between flue connection, the gas separator（16）Pass through air inlet pair respectively
Pipeline A（23）With evaporating column（11）Top air inlet connection, pass through air inlet secondary duct B（24）With evaporating column（11）Bottom air inlet
Connection, the air inlet secondary duct A（23）And air inlet secondary duct B（24）End is respectively provided with flow sensor and temperature sensor, institute
State pumping secondary duct B（21）On be provided with flow control valve B（19）, the pumping secondary duct A（20）On be provided with flow control
Valve A（17）, outlet pipe（25）Upper set temperature sensor, water pump（10）With evaporating column（11）Top passes through inlet channel（26）
Connection, inlet channel（26）It is middle that online water detection device and temperature sensor are set, further include operation control center, the fortune
Calculate control centre and water pump（10）, flow sensor, each temperature sensor, flow control valve A（17）, flow control valve B
（19）, the connection of online water detection device.
A kind of 6. high-temperature flue gas evaporation desulfurizing waste water processing device according to claim 3, it is characterised in that：The electricity removes
Dirt device（4）Front end sets the temperature monitoring of monitoring input gas temperature（18）, temperature monitoring（18）With operation control center
Connection.
7. a kind of high-temperature flue gas evaporates method for treating desulfurized wastewater, it is characterised in that：By wet desulphurization absorption tower（6）The slurry of discharge
Liquid send supernatant liquor to evaporating column after gypsum dehydration is handled（11）In, two kinds are extracted from the smoke evacuation system at boiler rear portion not
It is divided into the different air-flow of two plume amounts after synthermal flue gas mixing and each leads into evaporating column（11）Top and lower part are steamed with importing
Send out tower（11）Interior supernatant liquor carries out mixing streaming contact, evaporating column（11）The steam that desulfurization produces is from evaporating column（11）Top
Gas outlet is discharged, and powder or particulate matter after being evaporated drop to evaporating column（11）The ash bucket of bottom（14）In.
8. a kind of high-temperature flue gas evaporation method for treating desulfurized wastewater according to claim 7, it is characterised in that specifically include
Following steps：
A, wet desulphurization absorption tower（6）The slurries of discharge produce gypsum by gypsum dehydration system, and the waste water of generation enters desulfurization
Waste water liquid reserve tank（9）, stand natural subsidence for a period of time；
B, utilizes water pump（10）Extract desulfurization wastewater liquid reserve tank（9）Supernatant liquor is sent to evaporating column（11）Rotary-top formula atomizer
（12）Water inlet, desulfurization wastewater are sent to rotary atomizer（12）High speed rotating disk on, the centrifugal action of rotating disk makes to take off
Sulphur waste water is atomized, and the form of desulfurization wastewater droplet rotate at high speed is from evaporating column after atomization（11）Top spray；
C, from SCR catalytic denitration systems（2）With air preheater（3）Between flue extract part high-temperature flue gas, from air-introduced machine
（5）Flue afterwards draws a certain amount of low temperature neat stress, by high-temperature flue gas and low-temperature flue gas in gas diverter（16）In converge
It is divided into the different air-flow of two plume amounts afterwards, one flue gas is from evaporating column（11）Top enters, with evaporating column（11）Interior desulfurization wastewater
Droplet current contacting after swirling flow atomizing；Another strand of flue gas is from evaporating column（11）Bottom enters, and exchanges heat afterwards relatively with blast cap 13
Area increases, with evaporating column（11）Droplet counter current contacting after interior desulfurization wastewater swirling flow atomizing；
D, the steam after desulfurization wastewater atomization after the evaporation of droplet hygroscopic water is with cooling flue gas from evaporating column（11）Top gas outlet is through going out
Feed channel（25）It is discharged into electric precipitator（4）, after desulfurization wastewater evaporation in steam pollutant together with the dust in former flue gas
In electric precipitator（4）In be removed；
E, powder or particulate matter after being evaporated drop to evaporating column（11）The ash bucket of bottom（14）In, transport to grey field（15）It is comprehensive
Using.
A kind of 9. high-temperature flue gas evaporation method for treating desulfurized wastewater according to claim 8, it is characterised in that：The step
By controlling rotary atomizer in b（12）Rotary speed by mist droplet particle size control between 50 μm to 100 μm.
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| CN108793557A (en) * | 2018-06-14 | 2018-11-13 | 龙净科杰环保技术（上海）有限公司 | A kind of desulfurization wastewater bypass flue evaporation treatment process and system |
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| CN110756027B (en) * | 2019-11-27 | 2021-11-23 | 华北电力大学（保定） | Promote low-cost desulfurization waste water zero discharge system of gypsum quality |
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| CN111320222B (en) * | 2020-03-31 | 2024-01-23 | 大唐环境产业集团股份有限公司 | Desulfurization wastewater zero-emission treatment system and method based on double-tower structure |
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| CN115583682A (en) * | 2022-10-21 | 2023-01-10 | 济宁华源热电有限公司 | Desulfurization wastewater treatment system and desulfurization wastewater treatment method |
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