CN108558098A - A kind of method for treating desulfurized wastewater and device - Google Patents
A kind of method for treating desulfurized wastewater and device Download PDFInfo
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- CN108558098A CN108558098A CN201711353580.2A CN201711353580A CN108558098A CN 108558098 A CN108558098 A CN 108558098A CN 201711353580 A CN201711353580 A CN 201711353580A CN 108558098 A CN108558098 A CN 108558098A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D3/00—Halides of sodium, potassium or alkali metals in general
- C01D3/04—Chlorides
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F11/00—Compounds of calcium, strontium, or barium
- C01F11/46—Sulfates
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F5/00—Compounds of magnesium
- C01F5/40—Magnesium sulfates
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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
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
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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
- C02F1/38—Treatment of water, waste water, or sewage by centrifugal separation
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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
- C02F2001/007—Processes including a sedimentation step
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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
- 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
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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
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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Abstract
The present invention relates to field of industrial waste water treatment more particularly to a kind of method for treating desulfurized wastewater and device.Present invention employs the group technology processing methods of pretreatment+two-stage MVR evaporative crystallizations+single effect evaporation+spray drying, water, calcium sulfate, magnesium sulfate monohydrate, sodium chloride in desulfurization wastewater is separated and recovered, while improving water reuse rate, multiple product is also can get, the recycling of resource is realized.
Description
Technical field
The present invention relates to field of industrial waste water treatment more particularly to a kind of method for treating desulfurized wastewater and device.
Background technology
Desulfurization wastewater treatment technology route mainly has chemical precipitation method, flue gas evaporation, chemical tendering+evaporation knot at present
Crystallization.
Chemical precipitation method is current most common desulfuration waste water treatment process, three header techniques is commonly called as, in mainly passing through
The pollutants such as heavy metal and the suspended matter in desulfurization wastewater are removed with techniques such as precipitation, flocculations.Using this method, that treated is useless
Water Cl-It is dense to easy to produce secondary pollution.Body refuse, the sludge of such technique generation are not effectively addressed, and cause dirt
Dye transfer.
Flue gas method is the basic principle based on spray drying, and desulfurization wastewater sprays into flue after atomization, utilizes high temperature
Flue gas makes the impurity evaporation in waste water crystallize, and as flue dust is deviate from together in electric precipitator, but some pollutants are still
As flue gas is discharged into air, the carnallite of discharge can not be handled, while this method generates corrosion, this technique to dust pelletizing system
Stable degree influence original system operation.
Chemical tendering+evaporative crystallization method is that desulfurization wastewater is first passed around three headers (in pH and case-flow tank-flocculation tanks)
Processing removes heavy metal and suspended matter, then reuses Dual alkali (Ca (OH)2、Na2CO3) sofening treatment is carried out to waste water, make
Ca in waste water2+And Mg2+It is completely converted into Na+, waste water enters multiple-effect evaporation crystal system or MVR evaporation and crystallization systems, obtains
Sodium chloride, solid sodium sulfate.This technique sofening treatment process need to consume a large amount of medicament expense, and processing cost is high, and chlorination
Sodium, sodium sulphate are cheap, without too big economic benefit.
In the above method, first two can reach qualified discharge, but be discharged salt content height, can pollute transfer, there is dangerous waste
It generates, the resource also utilization not yet in effect in waste water.The third can effectively recycle sodium chloride product, but operating cost is high, sodium chloride
Added value is not high.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of method for treating desulfurized wastewater and devices.The present invention uses
The group technology of pretreatment+two-stage MVR evaporative crystallizations+single effect evaporation+spray drying, can be by water, the sulfuric acid in desulfurization wastewater
Calcium, magnesium sulfate monohydrate, sodium chloride are separated and recovered, and while improving water reuse rate, also be can get multiple product, are realized
The recycling of resource.The specific technical solution of the present invention is as follows.
According to an aspect of the present invention, a kind of method for treating desulfurized wastewater is provided, is included the following steps：
(1) desulfurization wastewater after pretreatment enters the first MVR crystallizing evaporators；In the first MVR crystallizing evaporators
Feed liquid reach and enter the first heat preservation settlement device after a certain concentration；The calcium sulfate being precipitated is saturated in the first heat preservation settlement device
It realizes and is separated by solid-liquid separation；
Supernatant in (2) first heat preservation settlement devices enters the 2nd MVR crystallizing evaporators, and supernatant is in the 2nd MVR
Circulating and evaporating in crystallizing evaporator；The feed liquid of 2nd MVR crystallizing evaporators enters the second heat preservation settlement device, is saturated a water of precipitation
Magnesium sulfate realizes separation of solid and liquid in the second heat preservation settlement device；
Supernatant in (3) second heat preservation settlement devices enters single effect evaporation crystallizer, and supernatant is in the single effect evaporation knot
It is evaporated in brilliant device；For the feed liquid of single effect evaporation crystallizer after separation of solid and liquid, liquid phase enters spray dryer；Through circulating-heating, make
Moisture in liquid phase is kept completely separate with mixed salt.
According to embodiment of the present invention, in step (1), be saturated precipitation calcium sulfate be separated by solid-liquid separation it is specific
Process is：The calcium sulfate slurry of the first heat preservation settlement device bottom is discharged into filter press feed containers, and calcium sulfate is obtained through press filtration
Solid；The filtrate of filter press enters the 2nd MVR crystallizing evaporators.
According to embodiment of the present invention, in step (2), it is saturated what the magnesium sulfate monohydrate of precipitation was separated by solid-liquid separation
Detailed process is：The magnesium sulfate monohydrate slurry of the second heat preservation settlement device bottom is discharged into the first centrifuge, and centrifuged one
Water magnesium sulfate；Centrifuge mother liquor enters single effect evaporation crystallizer.
According to embodiment of the present invention, in step (3), what the feed liquid of single effect evaporation crystallizer was separated by solid-liquid separation
Detailed process is：After the second centrifuge, solid sodium chloride and a part of magnesium sulfate monohydrate solid are obtained.
According to embodiment of the present invention, in step (1), the fixed gas of First Heat Exchanger is condensed through the first fixed gas
Device forms condensed water, and the condensed water is for preheating desulfurization of raw material waste water；
In step (2), the fixed gas of the second heat exchanger forms condensed water through the second fixed gas condenser, as desulfurization wastewater
The circulating cooling make-up water of processing unit；
In step (3), the moisture in liquid phase forms condensed water after being kept completely separate with mixed salt, by the 4th heat exchanger, makees
For the circulating cooling make-up water of desulfurizing waste water processing device.
According to embodiment of the present invention, the preprocess method of desulfurization of raw material waste water is：Alkaline reagent tune is first added
PH is saved, organic sulfur is added and removes heavy metal, then plus flocculant carries out flocculation sediment, through being separated by solid-liquid separation, after obtaining pretreatment
Desulfurization wastewater.
According to embodiment of the present invention, calcium sulfate crystal seed is added into desulfurization wastewater after pretreatment, through stirring
The first MVR crystallizing evaporators are entered back into after mixing.
According to embodiment of the present invention, the first MVR crystallizing evaporators carry out under negative pressure, and vacuum degree is
15kPa~20kPa.
According to another aspect of the present invention, it is useless to provide a kind of desulfurization for method for treating desulfurized wastewater as described above
Water treatment facilities, including：
First MVR crystallizing evaporators, the first heat preservation settlement device, the 2nd MVR crystallizing evaporators, the second heat preservation settlement device, list
Effect crystallizing evaporator and spray dryer, the first heat preservation settlement device connect and are located at the first MVR crystallizing evaporators
The downstream of the first MVR crystallizing evaporators, the second heat preservation settlement device is connect with the 2nd MVR crystallizing evaporators and position
In the downstream of the 2nd MVR crystallizing evaporators, the single effect evaporation crystallizer is located at the downstream of the second heat preservation settlement device,
The spray dryer connect with the single effect evaporation crystallizer and is located at the downstream of the single effect evaporation crystallizer.
According to embodiment of the present invention, desulfurizing waste water processing device according to the present invention further includes：With described
First fixed gas condenser of one MVR crystallizing evaporators connection, and connect with the 2nd MVR crystallizing evaporators second not
Solidifying gas condenser.
According to embodiment of the present invention, desulfurizing waste water processing device according to the present invention further includes：Positioned at described
The filter press in the first heat preservation settlement device downstream, the first centrifuge being connect with the second heat preservation settlement device, and steamed with single-action
Send out the second centrifuge of crystallizer connection.
According to embodiment of the present invention, desulfurizing waste water processing device according to the present invention further includes the first preheating
Device, first preheater connect with the first MVR crystallizing evaporators and are located at the upper of the first MVR crystallizing evaporators
Trip.
According to embodiment of the present invention, the first MVR crystallizing evaporators include First Heat Exchanger, the first separation
Device and the first compressor；First separator connect with the first heat preservation settlement device and is located at the upper of the first heat preservation settlement device
Trip.
The 2nd MVR crystallizing evaporators include the second heat exchanger, the second separator and the second compressor；Described second point
The upstream of the second heat preservation settlement device is connect and is located at the second heat preservation settlement device from device.
The single effect evaporation crystallizer includes third heat exchanger and third separator；And the third heat exchanger is located at institute
State the upstream of third separator；The third separator is connect with the second centrifuge positioned at the upstream of second centrifuge.
The desulfurizing waste water processing device further includes the 4th heat exchanger, the 4th heat exchanger and the spray dryer phase
Connect and be located at the downstream of the spray dryer.
The invention has the advantages that：
(1) preprocessing process softens without adding medicine, has saved a large amount of medicament expense, operating cost is low, with other works
Skill is compared, and has prodigious economic advantages, and without a large amount of sludge creation.
(2) crystal seed preventing fouling is used, scale problems of the calcium sulfate in heat exchanger is solved, improves heat transfer coefficient,
Operating cost is reduced, and ensure that the stable operation of system, is still belonged to the first time in the waste water of the processing high magnesium of high calcium.
(3) gravity settling device is used, calcium sulfate is detached with magnesium sulfate effectively, improves product purity, reaches state
Family's standard.
(4) present invention finally obtains the calcium sulfate, magnesium sulfate monohydrate, solid sodium chloride of high added value, realizes returning for resource
It receives and utilizes.
(5) a large amount of condensed waters generated in the process have reached circulating cooling make-up water standard, improve the utilization rate of water cycle,
Realize the zero-emission of water.In addition it uses MVR (mechanical vapor recompression technology) to evaporate, greatly reduces steam consumption.
(6) it uses low temperature spray drying technology to be used for the drying of a small amount of mixed salt mother liquor, thoroughly realizes desulfurization wastewater zero-emission.
Description of the drawings
Fig. 1 is the schematic diagram according to the desulfurizing waste water processing device of the present invention.
Fig. 2 is according to the composition of the first MVR crystallizing evaporators of the present invention and its connection diagram with other parts.
Fig. 3 is according to the composition of the 2nd MVR crystallizing evaporators of the present invention and its connection diagram with other parts.
Fig. 4 is according to the composition of the single effect evaporation crystallizer of the present invention and its connection diagram with other parts.
Wherein, the first material containers of 100-, the first MVR crystallizing evaporators of 101-, 102- the first heat preservation settlement devices, 103-
One preheater, 104- the first fixed gas condensers, the first condensed water containers of 105-, 106- filter press feed containers, 107- press filtrations
Machine, the second material containers of 200-, the 2nd MVR crystallizing evaporators of 201-, 202- the second heat preservation settlement devices, the first centrifuges of 203-,
204- the second fixed gas condensers, the second condensed water containers of 205-, 300- third material containers, 301- single effect evaporation crystallizers,
The second centrifuges of 302-, 304- third condensers, 305- third condensed water containers, 401- spray dryers, 501- first exchange heat
Device, the first separators of 502-, the first compressors of 503-, the second heat exchangers of 601-, the second separators of 602-, 603- second compress
Machine, 701- third heat exchangers, 702- third separators, the 4th heat exchangers of 801-.
Specific implementation mode
Specific implementation mode is only the description of the invention, without constituting the limitation to the content of present invention, below in conjunction with
Invention is further explained and description for specific embodiment.
According to an aspect of the present invention, a kind of method for treating desulfurized wastewater is provided, is included the following steps：
(1) desulfurization wastewater after pretreatment enters the first MVR crystallizing evaporators；In the first MVR crystallizing evaporators
Feed liquid reach and enter the first heat preservation settlement device after a certain concentration；The calcium sulfate being precipitated is saturated in the first heat preservation settlement device
It realizes and is separated by solid-liquid separation；Wherein, the calcium sulfate slurry of the first heat preservation settlement device bottom is discharged into filter press feed containers, is obtained through press filtration
Calcium sulphate solid；The filtrate of filter press enters the 2nd MVR crystallizing evaporators.
In the present invention, " feed liquid in the first MVR crystallizing evaporators reaches a certain concentration " refers to " concentration of magnesium ion
Reach 10%~the 15% " of feed liquid total weight.
According to embodiment of the present invention, the preprocess method of desulfurization of raw material waste water is：Alkaline reagent tune is first added
PH is saved, organic sulfur is added and removes heavy metal, then plus flocculant carries out flocculation sediment, through being separated by solid-liquid separation, after obtaining pretreatment
Desulfurization wastewater.
In preprocessing process, desulfurization wastewater enter stirring coagulation container, first be added alkaline reagent (such as sodium hydroxide,
Potassium hydroxide etc.) pH to 8-9 is adjusted, organic sulfur (such as TMT-15) about 50ppm is added, to remove heavy metal.Subsequently into stirring
Flocculation container to be mixed, 0.1% flocculant, about 3ppm-5ppm is added, desulfurization wastewater finally enters clarifying basin, after separation of solid and liquid,
Is produced from pond in supernatant liquor overflow to pretreatment.
Flocculant can be inorganic flocculating agent, such as aluminium polychloride (PAC), bodied ferric sulfate (PFS), aluminium polychloride
Iron (PAFC)；Or organic flocculant, such as it is anionic polyacrylamide (APAM), cationic polyacrylamide (CPAM), non-
Cationic polyacrylamide (NPAM).
During the desulfurization of raw material Wastewater Pretreatment of the present invention, softens without adding medicine, has saved a large amount of medicament expense,
Operating cost is low, compared with other techniques, has prodigious economic advantages, and without a large amount of sludge creation.
According to embodiment of the present invention, calcium sulfate crystal seed is added into desulfurization wastewater after pretreatment, through stirring
The first MVR crystallizing evaporators are entered back into after mixing.
The present invention uses crystal seed preventing fouling, solves scale problems of the calcium sulfate in heat exchanger, improves heat transfer system
Number, reduces operating cost, and ensure that the stable operation of system, still belongs to the first time in the waste water of the processing high magnesium of high calcium.
According to embodiment of the present invention, the first MVR crystallizing evaporators carry out under negative pressure, and vacuum degree is
15kPa~20kPa reduces evaporating temperature, and extraneous steam consumption is not needed in system, the indirect steam generated by system
It is recycled after compressor compression heating, greatly reduces steam consumption.
Specifically, pretreated desulfurization wastewater is squeezed into the first material container, is added in the first material container certain
Gypsum (calcium sulfate) crystal seed of amount, squeezes into the first preheater after agitated, using the first MVR crystallizing evaporators condensed water with into
The desulfurization wastewater entered in the first preheater exchanges heat, and the first heater outlet temperature is about 60 DEG C~70 DEG C.Waste water is preheated
Enter the first MVR crystallizing evaporators afterwards, evaporating temperature is at 103 DEG C or so.Fixed gas in First Heat Exchanger is through the first fixed gas
Condenser becomes condensed water and enters the first condensed water container.A part of condensed water pump of condensed water squeezes into the first preheater, is used for
Desulfurization of raw material waste water is preheated；A part squeezes into compressor through compressor spray pump and is used as spray, to eliminate the mistake of steam
Temperature.The magnesium ion concentration of feed liquid in first MVR crystallizing evaporators reach feed liquid total weight 10%~15% after squeeze into
One heat preservation settlement device, the calcium sulfate for being saturated precipitation realize separation of solid and liquid, wherein supernatant overflow in the first heat preservation settlement device
To the second material container, the calcium sulfate slurry of bottom is discharged into filter press feed containers by bottom valve, and calcium sulphate solid is obtained by press filtration；
The filtrate of filter press also enters the second material container simultaneously, and the filtrate of supernatant and filter press is evaporated collectively as the 2nd MVR ties
The raw material of brilliant device supplies.Entire first MVR crystallizing evaporators carry out under negative pressure, and vacuum degree is about 15kPa~20kPa.
The filtrate of supernatant and filter press in (2) first heat preservation settlement devices enters the 2nd MVR crystallizing evaporators, and in institute
State circulating and evaporating in the 2nd MVR crystallizing evaporators；The feed liquid of 2nd MVR crystallizing evaporators enters the second heat preservation settlement device, saturation
The magnesium sulfate monohydrate of precipitation realizes separation of solid and liquid in the second heat preservation settlement device；Wherein, the second heat preservation settlement device bottom
The magnesium sulfate monohydrate slurry in portion is discharged into the first centrifuge, centrifuged magnesium sulfate monohydrate；Centrifuge mother liquor enters single effect evaporation knot
Brilliant device.
Specifically, the feed liquid of the second material container (filtrate of supernatant and filter press) is squeezed into the 2nd MVR evaporative crystallizations
Device, feed liquid circulating and evaporating in the 2nd MVR crystallizing evaporators, evaporating temperature are about 108 DEG C.Steam condensate (SC) enters the second condensation
Water container, indirect steam compress heating through compressor and re-use, and the fixed gas of the second heat exchanger is through the second fixed gas condenser
Condensation forms condensed water, into the second condensed water container, as circulating cooling make-up water.The circulating cooling make-up water can be used for desulphurization system system
Starch the process water or component cooling water in workshop, it may also be used for moisturizing (such as desulfurizing tower absorbent water or the flushing of desulfurizing tower
Water).The feed liquid of 2nd MVR crystallizing evaporators squeezes into the second heat preservation settlement device through pump, and the magnesium sulfate monohydrate and water for being saturated precipitation exist
It realizes and is separated by solid-liquid separation in second heat preservation settlement device, wherein supernatant enters third material container, the magnesium sulfate monohydrate slurries of bottom
It is discharged into the first centrifuge and isolates magnesium sulfate monohydrate solid；Simultaneously centrifuge mother liquor also enter third material container, supernatant and from
Heart mother liquor is supplied collectively as the raw material of single effect evaporation crystallizer.
Supernatant and centrifuge mother liquor in (3) second heat preservation settlement devices enter single effect evaporation crystallizer, and in the single-action
It is evaporated in crystallizing evaporator；For the feed liquid of single effect evaporation crystallizer after separation of solid and liquid, liquid phase enters spray dryer；Add through cycle
Heat makes the moisture in liquid phase be kept completely separate with mixed salt；
According to embodiment of the present invention, the process that the feed liquid of single effect evaporation crystallizer is separated by solid-liquid separation is：Through
After second centrifuge, solid sodium chloride and a part of magnesium sulfate monohydrate solid are obtained.
Specifically, the progress evaporated with front, mother liquor gradually concentrate, and cause about 12 DEG C~15 DEG C of the elevation of boiling point, therefore
Three-level evaporative crystallization uses single effect evaporation crystallizer, is passed through raw steam as system heat sources, about 115 DEG C of evaporating temperature.By third
The feed liquid (supernatant and centrifuge mother liquor) of material container is evaporated into single effect evaporation crystallizer, and evaporation feed liquid enters gravity centrifugation
Machine isolates a large amount of solid sodium chloride and fraction magnesium sulfate monohydrate solid.Centrifuge mother liquor enters spray-drying feedstock container
Mother liquor, is atomized by (spray drying tower is recycled in such as) by high-pressure atomizer, using the superheated steam of 2.5MPa as heat source,
Air forms thermophore in heating system, evaporates the moisture in mother liquor, circulating-heating dried material, makes raw material mother liquor in systems
In moisture detached completely with mixed salt.The moisture evaporated is condensed into condensed water by the 4th heat exchanger, as circulating cooling make-up water.
The circulating cooling make-up water can be used for the process water or component cooling water of desulphurization system slip house, it may also be used for the moisturizing of desulfurizing tower
(such as desulfurizing tower absorbent water or flushing water).
The present invention can make desulfurization wastewater according to the property of different material by controlling different evaporating pressure and temperature
The a large amount of condensed waters generated in processing procedure reach circulating cooling make-up water standard, improve the utilization rate of water cycle, realize water
Zero-emission.
As shown in Figure 1, the desulfurization wastewater according to the present invention for method for treating desulfurized wastewater as described above handles dress
It sets, including：
First MVR crystallizing evaporators 101, the first heat preservation settlement device 102, the heat preservation of the 2nd MVR crystallizing evaporators 201, second
Settler 202, single effect evaporation crystallizer 301 and spray dryer 401, the first heat preservation settlement device 102 and the first MVR
Crystallizing evaporator 101 connect and positioned at the first MVR crystallizing evaporators 101 downstream, the second heat preservation settlement device 202 with
The 2nd MVR crystallizing evaporators 201 connect and positioned at the downstream of the 2nd MVR crystallizing evaporators 201, the single effect evaporations
Crystallizer 301 is located at the downstream of the second heat preservation settlement device 202, and the spray dryer 401 is crystallized with the single effect evaporation
Device 301 connects and positioned at the downstream of the single effect evaporation crystallizer 301.
The present invention uses gravity settling device (the first heat preservation settlement device, the second heat preservation settlement device), according to the difference of granularity,
Calcium sulfate can be detached with magnesium sulfate, improves product purity, be up to state standards.Using low temperature spray drying technology for few
The drying of mixed salt mother liquor is measured, thoroughly realizes desulfurization wastewater zero-emission.Therefore energy conservation and environmental protection of the present invention and sustainability of natural resources profit
With.
Desulfurizing waste water processing device according to the present invention can be by the calcium sulfate in desulfurization wastewater, magnesium sulfate monohydrate, chlorination
Sodium and water are separately recovered, and obtain the calcium sulfate, magnesium sulfate monohydrate and solid sodium chloride for the high added value for meeting national standard, realize
The recycling of resource；Entire technique does not have to arrange outside mother liquor simultaneously, substantially increases the comprehensive recovery of system, reduces technique
Operating cost, create economic benefit.
According to embodiment of the present invention, desulfurizing waste water processing device according to the present invention further includes：With described
First fixed gas condenser 104 of one MVR crystallizing evaporators 101 connection, and connect with the 2nd MVR crystallizing evaporators 201
The the second fixed gas condenser 204 connect.
According to embodiment of the present invention, desulfurizing waste water processing device according to the present invention further includes：Positioned at described
The filter press 107 in 102 downstream of the first heat preservation settlement device, the first centrifuge 203 being connect with the second heat preservation settlement device 202,
And the second centrifuge 302 being connect with single effect evaporation crystallizer 301.
According to embodiment of the present invention, desulfurizing waste water processing device according to the present invention further includes the first preheater
103, first preheater 103 connect with the first MVR crystallizing evaporators 101 and is located at the first MVR evaporative crystallizations
The upstream of device 101.
According to embodiment of the present invention, as shown in Figure 1, desulfurizing waste water processing device according to the present invention can be with
It is cold including the first material container 100, the first condensing container 105, filter press feed containers 106, the second material container 200, second
Solidifying container 205, third material container 300.First material container 100 connect with the first preheater 103 and positioned at described the
The upstream of one preheater 103；First condensing container, 105 and first fixed gas condenser 104, the first MVR crystallizing evaporators
101 are respectively connected with, and positioned at the downstream of the first fixed gas condenser 104 and are located at the first MVR crystallizing evaporators
101 downstream；The filter press feed containers 106 are respectively connected with the first heat preservation settlement device 102, filter press 107, and are located at institute
State the downstream of the first heat preservation settlement device 102 and the upstream positioned at the filter press 107；Second material container 200 and first
Heat preservation settlement device 102, the 2nd MVR crystallizing evaporators 201 are respectively connected with, and positioned at the first heat preservation settlement device 102 downstream,
And positioned at the upstream of the 2nd MVR crystallizing evaporators 201；Second condensing container, 205 and second fixed gas condenser
204, the 2nd MVR crystallizing evaporators 201 are respectively connected with, and positioned at the downstream of the second fixed gas condenser 204 and are located at institute
State the downstream of the 2nd MVR crystallizing evaporators 201；300 and second heat preservation settlement device 202 of the third material container, single effect evaporation
Crystallizer 301 is respectively connected with, and positioned at the downstream of the second heat preservation settlement device 202 and is located at the single effect evaporation crystallizer
301 upstream.
According to embodiment of the present invention, as shown in Fig. 2, the first MVR crystallizing evaporators include the first heat exchange
Device 501, the first separator 502 and the first compressor 503；And the First Heat Exchanger 501 is located at first separator 502
Upstream, first separator 502 is located at the upstream of first compressor 503, and first compressor 503 is located at described
The upstream of First Heat Exchanger 501.The First Heat Exchanger 501 and first preheater 103, the first fixed gas condenser 104,
First condensed water container 105 is separately connected, and positioned at first preheater 103 downstream, be located at first fixed gas it is cold
The upstream of condenser 104, positioned at the upstream of first condensed water container 105.First separator, 502 and first heat preservation settlement
Device 102 is connected and positioned at the upstream of the first heat preservation settlement device 102.
According to embodiment of the present invention, as shown in figure 3, the 2nd MVR crystallizing evaporators include the second heat exchange
Device 601, the second separator 602 and the second compressor 603；And second heat exchanger 601 is located at the upper of the second separator 602
Trip, second separator 602 are located at the upstream of second compressor 603, and second compressor 603 is located at described second
The upstream of heat exchanger 601.Second heat exchanger 601 and second material container 200, the second fixed gas condenser 204, the
Two condensed water containers 205 are separately connected, and positioned at second material container 200 downstream, be located at second fixed gas it is cold
The upstream of condenser 204, positioned at the upstream of second condensed water container 205.Second separator, 602 and second heat preservation settlement
Device 202 is connected and positioned at the upstream of the second heat preservation settlement device 202.
Below to First Heat Exchanger 501, the first separator 502 and the first compressor 503 in the first MVR crystallizing evaporators
Between connection relation and type of attachment illustrate.What the connection between First Heat Exchanger 501 and the first separator 502 was realized
The transmission between material, and between the first separator 502 and the first compressor 503, the first compressor 503 and First Heat Exchanger
Connection between 501 is accomplished that the transmission between steam.
For the second heat exchanger 601, the second separator 602 and the second compressor 603 in the 2nd MVR crystallizing evaporators it
Between connection relation and type of attachment, should also do understanding as described above.
According to embodiment of the present invention, as shown in figure 4, the single effect evaporation crystallizer 301 exchanges heat including third
Device 701 and third separator 702；And the third heat exchanger 701 is located at the upstream of the third separator 702；Described
Three heat exchangers 701 are respectively connected with the third material container 300, third condenser 304, third condensed water container 305, and position
The water capacity is condensed in the downstream of the third material container 300, positioned at the upstream of the third condenser 304, positioned at the third
The upstream of device 305.The third separator 702 connect with the second centrifuge 302 and positioned at the upper of second centrifuge 302
Trip.
According to embodiment of the present invention, as shown in Figure 1, the desulfurizing waste water processing device further includes the 4th heat exchange
Device 801, the 4th heat exchanger 801 are connected with the spray dryer 401 and positioned at the downstreams of the spray dryer 401.
In the present invention, " container " refers to for accommodating reactant and providing such as reaction container of reacting environment, retort, anti-
Answer pond etc..
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
God and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (10)
1. a kind of method for treating desulfurized wastewater, which is characterized in that include the following steps：
(1) desulfurization wastewater after pretreatment enters the first MVR crystallizing evaporators；Material in the first MVR crystallizing evaporators
Liquid enters the first heat preservation settlement device after reaching a certain concentration；The calcium sulfate that saturation is precipitated is realized in the first heat preservation settlement device
It is separated by solid-liquid separation；
Supernatant in (2) first heat preservation settlement devices enters the 2nd MVR crystallizing evaporators, and supernatant is evaporated in the 2nd MVR
Circulating and evaporating in crystallizer；The feed liquid of 2nd MVR crystallizing evaporators enters the second heat preservation settlement device, is saturated the sulfuric acid monohydrate of precipitation
Magnesium realizes separation of solid and liquid in the second heat preservation settlement device；
Supernatant in (3) second heat preservation settlement devices enters single effect evaporation crystallizer, and supernatant is in the single effect evaporation crystallizer
Middle evaporation；For the feed liquid of single effect evaporation crystallizer after separation of solid and liquid, liquid phase enters spray dryer；Through circulating-heating, make liquid phase
In moisture be kept completely separate with mixed salt.
2. according to the method described in claim 1, it is characterized in that, in step (1), the calcium sulfate for being saturated precipitation carries out solid-liquid point
From detailed process be：The calcium sulfate slurry of the first heat preservation settlement device bottom is discharged into filter press feed containers, is obtained through press filtration
To calcium sulphate solid；The filtrate of filter press enters the 2nd MVR crystallizing evaporators.
3. according to the method described in claim 1, it is characterized in that, in step (2), the magnesium sulfate monohydrate for being saturated precipitation is consolidated
Liquid separation detailed process be：The magnesium sulfate monohydrate slurry of the second heat preservation settlement device bottom is discharged into the first centrifuge, through from
Gains in depth of comprehension are to magnesium sulfate monohydrate；Centrifuge mother liquor enters single effect evaporation crystallizer.
4. according to the method described in claim 1, it is characterized in that, in step (3), the feed liquid of single effect evaporation crystallizer is consolidated
Liquid separation detailed process be：After the second centrifuge, solid sodium chloride and a part of magnesium sulfate monohydrate solid are obtained.
5. according to the method described in claim 1, it is characterized in that,
In step (1), the fixed gas of First Heat Exchanger forms condensed water through the first fixed gas condenser, the condensed water for pair
Desulfurization of raw material waste water is preheated；
In step (2), the fixed gas of the second heat exchanger forms condensed water through the second fixed gas condenser, as desulfurization wastewater processing
The circulating cooling make-up water of device；
In step (3), the moisture in liquid phase forms condensed water after being kept completely separate with mixed salt, by heat exchanger, useless as desulfurization
The circulating cooling make-up water of water treatment facilities.
6. according to the method described in claim 1, it is characterized in that, the preprocess method of desulfurization of raw material waste water is：Alkali is first added
Property reagent adjust pH, add organic sulfur remove heavy metal, then plus flocculant carry out flocculation sediment, through be separated by solid-liquid separation, obtain
Pretreated desulfurization wastewater.
7. according to the method described in claim 1, it is characterized in that, calcium sulfate crystalline substance is added into desulfurization wastewater after pretreatment
Kind, the first MVR crystallizing evaporators are entered back into after agitated.
8. according to the method described in claim 1, it is characterized in that, the first MVR crystallizing evaporators carry out under negative pressure, very
Reciprocal of duty cycle is 15kPa~20kPa.
9. for a kind of desulfurizing waste water processing device such as claim 1~8 any one of them method for treating desulfurized wastewater,
It is characterized in that, including：
First MVR crystallizing evaporators (101), the first heat preservation settlement device (102), the 2nd MVR crystallizing evaporators (201), second protect
Warm settler (202), single effect evaporation crystallizer (301) and spray dryer (401), the first heat preservation settlement device (102) with
First MVR crystallizing evaporators (101) connection and the downstream positioned at the first MVR crystallizing evaporators (101), described second
Heat preservation settlement device (202) connect with the 2nd MVR crystallizing evaporators (201) and is located at the 2nd MVR crystallizing evaporators
(201) downstream, the single effect evaporation crystallizer (301) are located at the downstream of the second heat preservation settlement device (202), the spraying
Drier (401) connect with the single effect evaporation crystallizer (301) and positioned at the downstream of the single effect evaporation crystallizer (301).
10. desulfurizing waste water processing device according to claim 9, which is characterized in that further include：It is steamed with the first MVR
The first fixed gas condenser (104) that crystallizer (101) connects is sent out, and is connect with the 2nd MVR crystallizing evaporators (201)
The second fixed gas condenser (204)；
Filter press (107) positioned at the first heat preservation settlement device (102) downstream, even with the second heat preservation settlement device (202)
The first centrifuge (203) connect, and the second centrifuge (302) for being connect with single effect evaporation crystallizer (301).
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Application publication date: 20180921 |