CN105523677B - A kind of desulfurization wastewater zero-discharge treatment system - Google Patents
A kind of desulfurization wastewater zero-discharge treatment system Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- 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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- 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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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
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- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
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Abstract
The invention discloses a kind of desulfurization wastewater zero-discharge treatment system, including the one-level chemical precipitation processing system set gradually（1）, secondary chemical precipitation process system, multi-effect evaporating device and equipment for separating liquid from solid, in addition to the mother liquor in multi-effect evaporating device is introduced into one-level chemical precipitation processing system（1）Pipeline.The beneficial effects of the invention are as follows：Reduce desulfurization wastewater fouling tendency, avoid fouling and influence heat transfer, corrosive ions to vaporization chamber heat exchanger tube cause corrosion phenomena such as generation；Desulfurization wastewater is changed into solute as the solution system based on NaCl simultaneously, multiple-effect vacuum evaporating, concentrating and crystallizing is carried out to desulfurization wastewater using coal fired power plant exhaust steam, and produces two level industrial goods salt byproduct, realizes desulfurization wastewater zero-emission.
Description
Technical field
The present invention relates to field technical field of waste water processing, in particular it relates to a kind of desulfurization wastewater zero-discharge treatment system.
Background technology
Coal fired power plant is during wet fuel gas desulfurizing technology, in order to maintain the balance of desulfurizer serum recycle system,
Timing is needed from absorption tower waste discharge, i.e. desulfurization wastewater.Compared with coal fired power plant in general industrial wastewater, water-quality ratio is more special for it
Very, wherein many materials are the first pollutant for requiring strictly to control in national environmental standard, it is mainly manifested in following
Aspect：（1）Waste water is in faintly acid, and PH is 4 ~ 6；（2）Suspension content is high, and particle is small, and main component is gypsum, secondly also has and
Calcium carbonate and calcium sulfite for being added in flying dust, sweetening process from flue gas etc.；（3）In waste water containing soluble chloride,
Fluoride etc.；（4）It is containing heavy metal element, wherein mosts such as Pb, Cd, Cr, Ni, Hg, Co, Cu, Al, Zn, Mn in waste water
The linear sewage drainage standard of thermal power plant（GB8978-1996）The heavy metal element of middle limitation.（5）In terms of water quality index, desulfurization is given up
Chemical oxygen consumption (COC) in water（COD）And one of transnormal itemses.
Domestic most common method for treating desulfurized wastewater is chemical precipitation method at present, and this method is to utilize physics, chemistry side
Method is by neutralizing, settling, the means such as clarification of flocculating remove most suspended substances, heavy metal ion etc. in desulfurization wastewater makes desulfurization
Waste water reaches the existing discharge standard of country.Still containing the Ca being dissolved in waste water in waste water after treatment by using the treatment method2+、
Mg2+ 、Cl-、SO4 2-Etc. the salinity of high concentration, if directly discharge length can have a strong impact on to surrounding water generation for a long time.
The content of the invention
The technical problems to be solved by the invention be to provide it is a kind of desulfurization wastewater is carried out multiple-effect vacuum evaporating, concentrating and crystallizing,
Recovery moisture and the desulfurization wastewater for producing industrial goods salt, can effectively avoiding fouling and corrosion from impacting vaporization chamber heat exchanger tube
Zero-discharge treatment system.
Technical scheme is used by the present invention solves the above problems：
A kind of desulfurization wastewater zero-discharge treatment system, including set gradually be used for remove heavy metal ion in desulfurization wastewater
And F-The one-level chemical precipitation processing system of ion, by adding Na2CO3Solution is to remove the Ca in desulfurization wastewater2+、Mg2+From
Son simultaneously generates NaCl secondary chemical precipitation process system, multi-effect evaporating device and equipment for separating liquid from solid, in addition to multiple-effect is steamed
Mother liquor in transmitting apparatus introduces the pipeline of one-level chemical precipitation processing system.
The present invention in the waste water after being handled through chemical precipitation method by adding Na2CO3Solution carries out second order reaction processing,
With CO3 2-Precipitate Ca therein2+、Mg2+Ion, reduce the Ca in water2+、Mg2+Ion concentration, the fouling for reducing desulfurization wastewater are inclined
To；Desulfurization wastewater is changed into solute as the solution system based on NaCl simultaneously.Desulfurization wastewater after second order reaction is handled, it is right
It carries out multiple-effect vacuum evaporating, concentrating and crystallizing, moisture in desulfurization wastewater is separated with salinity, and moisture recycles, and produces main
Composition is NaCl two level industrial goods salt byproduct, realizes the processing system of desulfurization wastewater zero-emission.The processing system is main
The clear water for producing high-purity recycles, while produces the two level industrial goods salt byproduct that main component is NaCl, creates additional
Value.
And before the scale-forming ion fouling in multi-effect evaporating device in mother liquor, corrosive ions concentration reach corrosion heat exchanger tube it is dense
The partial mother liquid in multi-effect evaporating device is introduced into one-level chemical precipitation processing system before degree, so as to reduce multiple-effect evaporation concentration knot
The concentration of the scale-forming ion of mother liquor and corrosive ions in brilliant device, avoids the generation of fouling and corrosion.
One-level chemical precipitation processing system is that the device of desulfurization wastewater processing is carried out using the traditional chemical precipitation method, for tradition
Equipment, it generally comprises neutralization case, flow tank, flocculation tanks and the primary-clarifiers set gradually, and desulfurization wastewater, which enters, neutralizes case
Afterwards, aqua calcis regulation pH value is added into neutralization case, while makes Mg2+、Pb2+、Cr3+、Cd2+Plasma is with hydroxide
Form is precipitated out, the F in waste water-Ion is with CaF2Form settles, and neutralizes the waste water for completing to react in case and enters sedimentation
Case, and organic sulfur is added into flow tank, make remnants Pb2+、Cr3+、Cd2+It is settled out etc. heavy metal ion with sulphided form
Come, the waste water that reaction is completed in flow tank enters flocculation tanks, and flocculant is added into flocculation tanks（Chloro sulphuric acid iron）, flocculation aid
（PAM）Sediment is set to combine sedimentation, through the waste water of flocculation tanks discharge after primary-clarifiers are clarified, into secondary chemical place of settling
Reason system.
Described secondary chemical precipitation process system includes second order reaction case, Secondary clarifier and the filtering set gradually
Device.Na is added into second order reaction case2CO3Solution is with CO3 2-Precipitate Ca therein2+、Mg2+Ion, reduce the Ca in water2+、Mg2+
Ion concentration, reduces the fouling tendency of desulfurization wastewater, while desulfurization wastewater is changed into solute for the solution system based on NaCl,
Enter multi-effect evaporating device after Secondary clarifier and filter remove precipitation.
Described multi-effect evaporating device includes multiple evaporating, concentrating and crystallizing devices, and each evaporating, concentrating and crystallizing device is respectively provided with
There is the pipeline that its internal mother liquor is introduced to one-level chemical precipitation processing system.The steam of input is utilized repeatedly, and steam is sharp
Number is referred to as " effect number ", and the heating steam of head effects is provided by external steam feeding mechanism, it is preferred that the heating steam of head effects
There is provided by exhaust steam of electric power plant, indirect steam caused by previous effect evaporation enters next effect evaporating, concentrating and crystallizing device, as next effect
The heating steam of evaporating, concentrating and crystallizing device, by that analogy, steam is repeatedly utilized, and the evaporation of end effect evaporated crystallization device produces
Indirect steam deliver to end effect vapour condensation device and be cooled with circulating water to form vacuum, improve heat transfer temperature difference.Dense salt slurry uses
Turn material mode by effect, i.e., first effect concentrate is transferred to two effects and concentrated again, and two effect concentrates are transferred to next effect, by that analogy.
The salt slurries of end effect evaporating, concentrating and crystallizing device enter equipment for separating liquid from solid.During the effect evaporating, concentrating and crystallizing device quantitative design of centre
Increased and decreased according to system processing power.
Described evaporating, concentrating and crystallizing device includes heating chamber, circulating pump and vaporization chamber, and the drainpipe connection of vaporization chamber follows
The water inlet of ring pump, the water inlet pipe of the discharge outlet connection heater of circulating pump, the water inlet of the drainpipe connection vaporization chamber of heater
Manage, the liquid in vaporization chamber and heater circulates in the presence of circulating pump, and row's steam pipe of vaporization chamber connects next effect
The steam input pipe of the heating chamber of evaporating, concentrating and crystallizing device, the steam input pipe of the heating chamber of head effect evaporating, concentrating and crystallizing devices
SS is connected, is provided with the mother liquor of previous effect evaporating, concentrating and crystallizing device between adjacent two-effect evaporation concentration and crystallization device
Introduce the pipeline of next effect evaporating, concentrating and crystallizing device, the mother liquor discharge pipe connection separation of solid and liquid of end effect evaporating, concentrating and crystallizing device
Device, the wastewater drainage pipe of secondary chemical precipitation process system are connected with each effect evaporating, concentrating and crystallizing device, and wastewater drainage pipe connects
The pipeline of the drainpipe of the connection vaporization chamber of logical each effect evaporating, concentrating and crystallizing device and the water inlet of circulating pump.Make at second order reaction
The often effect that desulfurization wastewater advection after reason enters in multiple-effect evaporation concentration and crystallization device, i.e., often imitate in vaporization chamber into fresh
Desulfurization wastewater.
Heating chamber is heat exchanger structure, after the steam input pipe of heating steam heated room enters heating chamber, with heating chamber
Liquid in pipeline is exchanged heat, and Heat Room is discharged after being condensed into condensate liquid.Wastewater mother liquor is heating under the driving of circulating pump
Circulated in room and vaporization chamber.
The desulfurization wastewater forced circulation under forced circulation pumping action, secondary chemical place of settling in evaporating, concentrating and crystallizing device
Desulfurization wastewater advection after the processing of reason system is sent into each effect evaporating, concentrating and crystallizing device circulation pipe, and flow velocity is improved through forced circulation pump
Enter heating chamber afterwards and carry out gas-liquid separation with entering vaporization chamber after steam heat-exchanging heating.
Described evaporating, concentrating and crystallizing device improves rate of circulating flow using forced circulation, improves heat transfer coefficient, reduces equipment
Investment, while reduce heat exchanger tube fouling tendency.
Preferably, the steam that described multi-effect evaporating device uses is exhaust steam caused by power station, i.e. multi-effect evaporating device
The exhaust steam discharge pipe in the steam input pipe connection power station of the heating chamber of head effect evaporating, concentrating and crystallizing devices, the exhaust steam that power station is sent are sent
Desulfurization wastewater is heated to head effect heating chambers, heat of the indirect steam as next effect heating chamber caused by head effect vaporization chambers
Source, the like.Multiple-effect vacuum evaporating, concentrating and crystallizing is carried out to the desulfurization wastewater after second order reaction is handled using exhaust steam of electric power plant,
Moisture in desulfurization wastewater is set to be separated with salinity.So as to take full advantage of the heat energy of exhaust steam of electric power plant, resource is saved, avoids heat energy
Waste.
Described evaporating, concentrating and crystallizing device also includes condensed water balance bucket, the condensed water discharge pipe connection condensation of heating chamber
Water balance bucket, the condensed water that heating steam is formed flow into level of condensation weighing apparatus bucket, and condensed water balance bucket is provided with flash-off steam discharge
Pipe, flash-off steam discharge pipe connect the steam input pipe of heating chamber.
Further, the latter effect evaporation of drainpipe connection of the condensed water balance bucket of previous effect evaporating, concentrating and crystallizing device is dense
The condensed water balance bucket of contracting crystallization apparatus, so as to utilization of condensed water condensed water balance caused by previous effect evaporating, concentrating and crystallizing device
Bucket delivers to latter effect condensed water balance bucket after collecting, with latter effect heating chamber caused by give after condensed water mixing shwoot some vapor
To next effect condensed water balance bucket, so circulation.
Preferably, described desulfurization wastewater zero-discharge treatment system also includes a preheater, secondary chemical precipitation process
The discharging tube of system is connected with evaporating, concentrating and crystallizing device again after connecting the preheater, the condensation of end effect evaporating, concentrating and crystallizing device
The drainpipe of water balance bucket reconnects condensed water bucket after connecting the preheater by pipeline, so as to be sunk by condensed water to secondary chemical
The desulfurization wastewater of shallow lake processing system discharge is preheated, and the condensed water after heat exchange flow to condensed water bucket and reclaimed again, so as to fill
Divide the heat energy that make use of condensed water, that is, take full advantage of the heat energy of heating steam.The condensed water that condensed water bucket is collected can send electricity back to
Factory recycles.
Described equipment for separating liquid from solid includes the liquid row of the thickener and centrifuge set gradually, thickener and centrifuge
Outlet pipe connects mother vat, the discharging tube connection multiple-effect evaporation concentration and crystallization device of mother vat.In multiple-effect evaporation concentration and crystallization device
The salt slurries of output deliver to suspension separation again in thickener, and the salt slurry after thickening recycles centrifuge to carry out separation of solid and liquid, point
Separate out solid salt to take out as Nacl, the saline solution isolated, which is returned in vaporization chamber, to be evaporated.
Preferably, the discharging tube of mother vat also connects one-level chemical precipitation processing system by pipeline, female in mother vat
Before scale-forming ion concentration in liquid reaches before fouling concentration or corrosive ions concentration reaches corrosion heat exchanger tube concentration, by mother vat
Internal decomposition mother solution introduces one-level chemical precipitation processing system, dense so as to reduce the ion of mother liquor in multiple-effect evaporation concentration and crystallization device
Degree, avoids the generation of fouling and corrosion.
Described desulfurization wastewater zero-discharge treatment system also includes end effect vapour condensation device, the end effect of multi-effect evaporating device
Row's steam pipe of the vaporization chamber of evaporating, concentrating and crystallizing device connects the end effect vapour condensation device, end effect vapour condensation device it is cold
Condensate discharging tube connects condensed water bucket.Described end effect vapour condensation device is surface condenser, it is preferred that surface condenser connects
A vavuum pump vacuumized to it is connected to, for fixed gas to be emptied.
Using the present invention, for the desulfurization wastewater of different disposal amount, required heat exchange area only need to be calculated, with reference to investment etc.
Effect quantity can be achieved among selection is suitable.
Multiple-effect vacuum evaporating, concentrating and crystallizing technology in the multiple-effect evaporation condensing crystallizing system uses two kinds of inner loop modes
The concentration of control system internal corrosive ion and fouling tendency type ion is in limits：1）Set multi-effect evaporating device female
Liquid return duct is to front end one-level chemical precipitation processing system； 2）Mother liquor reflux caused by equipment for separating liquid from solid is heavy to one-level chemistry
Shallow lake processing system.
To sum up, the beneficial effects of the invention are as follows：
1st, solve the directly pollution of discharge to surrounding water etc. of the salinity in the desulfurization wastewater after chemical precipitation method processing to ask
Topic；Multiple-effect vacuum evaporating, concentrating and crystallizing is carried out to desulfurization wastewater using coal fired power plant exhaust steam, makes moisture and salinity in desulfurization wastewater
Separation, water utilization is reclaimed, and produce the two level industrial goods salt byproduct that main component is NaCl, realize the zero-emission of desulfurization wastewater
Put.
Using the present invention, for the water for the desulfurization wastewater that need to be handled, with reference to the desulfurization wastewater for different disposal amount, only
Required heat exchange area need to be calculated, can be achieved with reference to the suitable middle effect quantity of the selections such as investment.
2nd, before the scale-forming ion fouling in vaporization chamber feed liquid before, corrosive ions concentration reaches corrosion heat exchanger tube concentration, row
Go out the feed liquid of part vaporization chamber to chemical precipitation processing system, the scale-forming ion for avoiding high concentration can be on vaporization chamber heat exchanger tube
Fouling and influence heat transfer, the hair for phenomena such as corrosive ions of high concentration can cause corrosion to vaporization chamber heat exchanger tube after enrichment method
It is raw.
3rd, heating steam of the indirect steam as next effect caused by evaporation, steam are repeatedly utilized, and have saved the energy.
4th, the scale-forming ion concentration in mother vat in mother liquor reaches before fouling concentration or corrosive ions concentration reaches corrosion
Before heat exchanger tube concentration, decomposition mother solution inside mother vat is introduced into one-level chemical precipitation processing system, avoided with high concentration fouling
The mother liquor of ion and corrosive ions enters multiple-effect evaporation concentration and crystallization device, and the scale-forming ion for avoiding high concentration can be in vaporization chamber
Fouling on heat exchanger tube and influence heat transfer, the corrosive ions of high concentration can cause corrosion etc. existing to vaporization chamber heat exchanger tube after enrichment method
The generation of elephant.
5th, vaporization chamber form uses forced-circulation evaporation room, and each vaporization chamber of imitating is configured with forced circulation pump, increases desulfurization and gives up
Flow velocity of the water in vaporization chamber heat exchanger tube, vaporization chamber heat transfer coefficient is improved, reduce equipment investment, while reduce salinity in heat exchanger tube
Upper fouling possibility.
6th, multi-effect evaporation system feeding manner is fed using advection, reduces fouling tendency.
7th, respectively the salt of effect vaporization chamber output goes to middle effect from head effects, goes to end effect successively, is discharged from end effect, reduces discharge
Salt slurry temperature, system heat loss is reduced, reduce steam consumption, save the energy.
8th, steam condensate (SC) is collected with condensed water balance bucket, and shwoot goes out some vapor as heating steam, reduces steam and uses
Amount, save the energy.
9th, desulfurization wastewater is preheated using steam condensate (SC), raising enters vaporization chamber desulfurization wastewater temperature, reduces and steams
Vapour dosage, save the energy.
The 10th, vavuum pump is set, the incoagulable gas in extraction system, improve end effect vacuum, improve effective heat transfer temperature difference,
Steam consumption is reduced, saves the energy.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention.
Mark and corresponding parts title in accompanying drawing：
1- one-level chemical precipitation processing systems, 2- second order reaction casees, 3- Secondary clarifiers, 4- filters, 5- preheaters, 6-
Circulating pump, 7- heating chambers, 8- vaporization chambers, 9- condensed waters balance bucket, 10- thickeners, 11- centrifuges, 12- mother vats, 13- surfaces
Condenser, 14- condensed water buckets, 15- vavuum pumps.
Embodiment
The present invention will now be described in further detail with reference to the accompanying drawings and the accompanying drawings, but embodiments of the present invention
Not limited to this.
Embodiment：
As shown in figure 1, a kind of desulfurization wastewater zero-discharge treatment system, including what is set gradually are used to remove in desulfurization wastewater
Heavy metal ion and F-The one-level chemical precipitation processing system 1 of ion, by adding Na2CO3Solution is to remove in desulfurization wastewater
Ca2+、Mg2+Ion and secondary chemical precipitation process system, multi-effect evaporating device and the equipment for separating liquid from solid for generating NaCl, are also wrapped
Include the pipeline that the mother liquor in multi-effect evaporating device is introduced to one-level chemical precipitation processing system 1.
The present invention in the waste water after being handled through chemical precipitation method by adding Na2CO3Solution carries out second order reaction processing,
With CO3 2-Precipitate Ca therein2+、Mg2+Ion, reduce the Ca in water2+、Mg2+Ion concentration, the fouling for reducing desulfurization wastewater are inclined
To；Desulfurization wastewater is changed into solute as the solution system based on NaCl simultaneously.Desulfurization wastewater after second order reaction is handled, it is right
It carries out multiple-effect vacuum evaporating, concentrating and crystallizing, moisture in desulfurization wastewater is separated with salinity, and moisture recycles, and produces main
Composition is NaCl two level industrial goods salt byproduct, realizes the processing system of desulfurization wastewater zero-emission.The processing system is main
The clear water for producing high-purity recycles, while produces the two level industrial goods salt byproduct that main component is NaCl, creates additional
Value.
And before the scale-forming ion fouling in multi-effect evaporating device in mother liquor, corrosive ions concentration reach corrosion heat exchanger tube it is dense
The partial mother liquid in multi-effect evaporating device is introduced into one-level chemical precipitation processing system 1 before degree, so as to reduce multiple-effect evaporation concentration
The concentration of the scale-forming ion of mother liquor and corrosive ions in crystallization apparatus, avoids the generation of fouling and corrosion.
One-level chemical precipitation processing system 1 is that the device of desulfurization wastewater processing is carried out using the traditional chemical precipitation method, to pass
System equipment, it generally comprises neutralization case, flow tank, flocculation tanks and the primary-clarifiers set gradually, and desulfurization wastewater, which enters, to be neutralized
After case, aqua calcis regulation pH value is added in case to neutralizing, while make Mg2+、Pb2+、Cr3+、Cd2+Plasma is with hydroxide
Thing form is precipitated out, the F in waste water-Ion is with CaF2Form settles, and neutralizes the waste water for completing to react in case and enters sedimentation
Case, and organic sulfur is added into flow tank, make remnants Pb2+、Cr3+、Cd2+It is settled out etc. heavy metal ion with sulphided form
Come, the waste water that reaction is completed in flow tank enters flocculation tanks, and flocculant chloro sulphuric acid iron, flocculation aid PAM are added into flocculation tanks
Sediment is set to combine sedimentation, through the waste water of flocculation tanks discharge after primary-clarifiers are clarified, into secondary chemical precipitation process system
System.
Described secondary chemical precipitation process system includes the second order reaction case 2, Secondary clarifier 3 and filtering set gradually
Device 4.Na is added into second order reaction case 22CO3Solution is with CO3 2-Precipitate Ca therein2+、Mg2+Ion, reduce the Ca in water2+、
Mg2+Ion concentration, reduces the fouling tendency of desulfurization wastewater, while desulfurization wastewater is changed into solute for the solution body based on NaCl
System, enter multi-effect evaporating device after Secondary clarifier 3 and filter 4 remove precipitation.
Described multi-effect evaporating device includes multiple evaporating, concentrating and crystallizing devices, and each evaporating, concentrating and crystallizing device is respectively provided with
There is the pipeline that its internal mother liquor is introduced to one-level chemical precipitation processing system 1.The steam of input is utilized repeatedly, and steam is sharp
Number is referred to as " effect number ", and the heating steam of head effects is provided by external steam feeding mechanism, it is preferred that the heating steam of head effects
There is provided by exhaust steam of electric power plant, indirect steam caused by previous effect evaporation enters next effect evaporating, concentrating and crystallizing device, as next effect
The heating steam of evaporating, concentrating and crystallizing device, by that analogy, steam is repeatedly utilized, and the evaporation of end effect evaporated crystallization device produces
Indirect steam deliver to end effect vapour condensation device and be cooled with circulating water to form vacuum, improve heat transfer temperature difference.Dense salt slurry uses
Turn material mode by effect, i.e., first effect concentrate is transferred to two effects and concentrated again, and two effect concentrates are transferred to next effect, by that analogy.
The salt slurries of end effect evaporating, concentrating and crystallizing device enter equipment for separating liquid from solid.During the effect evaporating, concentrating and crystallizing device quantitative design of centre
Increased and decreased according to system processing power.
Described evaporating, concentrating and crystallizing device includes heating chamber 7, circulating pump 6 and vaporization chamber 8, and the drainpipe of vaporization chamber 8 connects
Connect the water inlet of circulating pump 6, the water inlet pipe of the discharge outlet connection heater of circulating pump 6, the drainpipe connection vaporization chamber 8 of heater
Water inlet pipe, the liquid in vaporization chamber 8 and heater circulates in the presence of circulating pump 6, and row's steam pipe of vaporization chamber 8 connects
The steam input pipe of the heating chamber 7 of next effect evaporating, concentrating and crystallizing device is connect, the heating chamber 7 of head effect evaporating, concentrating and crystallizing devices
Steam input pipe connects SS, is provided between adjacent two-effect evaporation concentration and crystallization device by previous effect evaporating, concentrating and crystallizing
The mother liquor of device introduces the pipeline of next effect evaporating, concentrating and crystallizing device, and the mother liquor discharge pipe of end effect evaporating, concentrating and crystallizing device connects
Equipment for separating liquid from solid is connect, the wastewater drainage pipe of secondary chemical precipitation process system is connected with each effect evaporating, concentrating and crystallizing device, given up
The pipeline of the drainpipe and the water inlet of circulating pump 6 of the connection vaporization chamber 8 of each effect evaporating, concentrating and crystallizing device of water drainpipe connection,
Pipeline one end connection one-level chemistry that mother liquor inside evaporating, concentrating and crystallizing device is introduced to one-level chemical precipitation processing system 1 is heavy
The water inlet pipe of shallow lake processing system 1, the drainpipe and the water inlet of circulating pump 6 of the connection vaporization chamber 8 of evaporating, concentrating and crystallizing device
Pipeline, one end connection.The often effect for making the desulfurization wastewater advection after second order reaction processing enter in multiple-effect evaporation concentration and crystallization device,
Often imitate in vaporization chamber 8 and enter fresh desulfurization wastewater.
Heating chamber 7 is heat exchanger structure, after the steam input pipe of heating steam heated room 7 enters heating chamber 7, with heating
Liquid in the pipeline of room 7 is exchanged heat, and Heat Room is discharged after being condensed into condensate liquid.Wastewater mother liquor under the driving of circulating pump 6
Circulated in heating chamber 7 and vaporization chamber 8.
The desulfurization wastewater forced circulation under the effect of forced circulation pump 6, secondary chemical precipitation in evaporating, concentrating and crystallizing device
Desulfurization wastewater advection after processing system processing is sent into each effect evaporating, concentrating and crystallizing device circulation pipe, is improved through forced circulation pump 6
Enter heating chamber 7 after flow velocity and carry out gas-liquid separation with entering vaporization chamber 8 after steam heat-exchanging heating.
Described evaporating, concentrating and crystallizing device improves rate of circulating flow using forced circulation, improves heat transfer coefficient, reduces equipment
Investment, while reduce heat exchanger tube fouling tendency.
Preferably, the steam that described multi-effect evaporating device uses is exhaust steam caused by power station, i.e. multi-effect evaporating device
The exhaust steam discharge pipe in the steam input pipe connection power station of the heating chamber 7 of head effect evaporating, concentrating and crystallizing devices, the exhaust steam that power station is sent
Deliver to first effect heating chamber 7 to heat desulfurization wastewater, indirect steam is as next effect heating chamber 7 caused by head effect vaporization chambers 8
Thermal source, the like.Multiple-effect vacuum evaporation and concentration is carried out to the desulfurization wastewater after second order reaction is handled using exhaust steam of electric power plant
Crystallization, makes moisture in desulfurization wastewater be separated with salinity.So as to take full advantage of the heat energy of exhaust steam of electric power plant, resource is saved, is avoided
The waste of heat energy.
Described evaporating, concentrating and crystallizing device also includes condensed water balance bucket 9, and the condensed water discharge pipe connection of heating chamber 7 is cold
Condensate balances bucket 9, and the condensed water that heating steam is formed flows into level of condensation weighing apparatus bucket 9, and condensed water balance bucket 9 is provided with flash-off steam
Discharge pipe, flash-off steam discharge pipe connect the steam input pipe of heating chamber 7.
Further, the latter effect evaporation of drainpipe connection of the condensed water balance bucket 9 of previous effect evaporating, concentrating and crystallizing device
The condensed water balance bucket 9 of concentration and crystallization device, so as to utilization of condensed water condensed water caused by previous effect evaporating, concentrating and crystallizing device
Balance bucket 9 delivers to latter effect condensed water balance bucket 9 after collecting, condensed water mixing shwoot part caused by heating chamber 7 is imitated with latter
Next effect condensed water balance bucket 9, so circulation are delivered to after steam.
Preferably, described desulfurization wastewater zero-discharge treatment system also includes a preheater 5, secondary chemical precipitation process
The discharging tube of system is connected with evaporating, concentrating and crystallizing device again after connecting the preheater 5, end effect evaporating, concentrating and crystallizing device it is cold
The drainpipe of condensate balance bucket 9 reconnects condensed water bucket 14 after connecting the preheater 5 by pipeline, so that by condensed water to two level
The desulfurization wastewater of chemical precipitation processing system discharge is preheated, and the condensed water after heat exchange flow to condensed water bucket 14 and returned again
Receive, so as to take full advantage of the heat energy of condensed water, that is, take full advantage of the heat energy of heating steam.The condensation that condensed water bucket 14 is collected
Water can send power plant's recycling back to.
Described equipment for separating liquid from solid includes the thickener 10 and centrifuge 11 set gradually, thickener 10 and centrifuge 11
Liquid discharge tube connection mother vat 12, mother vat 12 discharging tube connection multiple-effect evaporation concentration and crystallization device.Multiple-effect evaporation is dense
The salt slurries of output deliver to suspension separation again in thickener 10 in contracting crystallization apparatus, and the salt slurry after thickening recycles centrifuge 11
Separation of solid and liquid is carried out, solid salt is isolated and is taken out as Nacl, the saline solution isolated, which is returned in vaporization chamber 8, to be evaporated.
Preferably, the discharging tube of mother vat 12 also connects one-level chemical precipitation processing system 1 by pipeline, in mother vat 12
Before scale-forming ion concentration in interior mother liquor reaches before fouling concentration or corrosive ions concentration reaches corrosion heat exchanger tube concentration, by mother
The inside decomposition mother solution of liquid bucket 12 introduces one-level chemical precipitation processing system 1, so as to reduce mother liquor in multiple-effect evaporation concentration and crystallization device
Ion concentration, avoid the generation of fouling and corrosion.
Described desulfurization wastewater zero-discharge treatment system also includes end effect vapour condensation device, the end effect of multi-effect evaporating device
Row's steam pipe of the vaporization chamber 8 of evaporating, concentrating and crystallizing device connects the end effect vapour condensation device, end effect vapour condensation device
Condensed water discharging tube connects condensed water bucket 14.Described end effect vapour condensation device is surface condenser 13, it is preferred that surface is cold
Condenser 13 is connected with a vavuum pump vacuumized to it 15, for fixed gas to be emptied.
Using the present invention, for the desulfurization wastewater of different disposal amount, required heat exchange area only need to be calculated, with reference to investment etc.
Effect quantity can be achieved among selection is suitable.
Multiple-effect vacuum evaporating, concentrating and crystallizing technology in the multiple-effect evaporation condensing crystallizing system uses two kinds of inner loop modes
The concentration of control system internal corrosive ion and fouling tendency type ion is in limits：1 sets multi-effect evaporating device female
Liquid return duct is to front end one-level chemical precipitation processing system 1；Mother liquor reflux caused by 2 equipment for separating liquid from solid is heavy to one-level chemistry
Shallow lake processing system 1.
Using the zero emission treatment of desulfured waste water of the processing system, comprise the following steps：Desulfurization wastewater is through one-level
After the processing of chemical precipitation processing system 1, into desulfurization wastewater, addition sodium carbonate is reacted, and is then precipitated desulfurization wastewater, mistake
It is sent into multi-effect evaporating device after filter to be evaporated, the steam for evaporating output obtains condensed water after repeatedly heat exchange, evaporates output
Salt slurry enters equipment for separating liquid from solid and carries out separation of solid and liquid, obtains solid salt, the scale-forming ion knot of mother liquor in multi-effect evaporating device
Before dirt, corrosive ions concentration reach before corrosion heat exchanger tube concentration that the partial mother liquid in multi-effect evaporating device is introduced into one-level chemistry is heavy
Shallow lake processing system 1 is handled, and the partial mother liquid is handled through chemical precipitation processing system, reduces scale-forming ion concentration and corrosion in mother liquor
After ion concentration, it is again introduced into multi-effect evaporating device and is evaporated.
The present invention in the waste water after being handled through chemical precipitation method by adding Na2CO3Solution carries out second order reaction processing,
With CO3 2-Precipitate Ca therein2+、Mg2+Ion, reduce the Ca in water2+、Mg2+Ion concentration, the fouling for reducing desulfurization wastewater are inclined
To；Desulfurization wastewater is changed into solute as the solution system based on NaCl simultaneously.Desulfurization wastewater after second order reaction is handled, it is right
It carries out multiple-effect vacuum evaporating, concentrating and crystallizing, moisture in desulfurization wastewater is separated with salinity, and moisture recycles, and produces main
Composition is NaCl two level industrial goods salt byproduct, realizes the processing system of desulfurization wastewater zero-emission.The processing system is main
The clear water for producing high-purity recycles, while produces the two level industrial goods salt byproduct that main component is NaCl, creates additional
Value.Before scale-forming ion fouling in multi-effect evaporating device in mother liquor, corrosive ions concentration reach corrosion heat exchanger tube concentration before will
Partial mother liquid in multi-effect evaporating device introduces one-level chemical precipitation processing system 1, so as to reduce multiple-effect evaporation condensing crystallizing dress
The ion concentration of interior mother liquor is put, avoids the generation of fouling and corrosion.
Further, in addition to by separation of solid and liquid the mother liquor obtained is introduced to the step of multi-effect evaporating device is evaporated.
Further, be additionally included in the mother liquor that separation of solid and liquid obtains scale-forming ion concentration reach fouling concentration before, corrosion
Before ion concentration reaches corrosion heat exchanger tube concentration, the mother liquor is introduced into one-level chemical precipitation processing system 1 and handled.Avoiding has
The mother liquor of high concentration scale-forming ion and corrosive ions enters multiple-effect evaporation concentration and crystallization device, and then avoids the fouling of high concentration
Ion can on the heat exchanger tube of vaporization chamber 8 fouling and influence heat transfer, the corrosive ions of high concentration can be changed vaporization chamber 8 after enrichment method
Heat pipe causes the generation of phenomena such as corrosion.
Further, in addition to by condensed water caused by multi-effect evaporating device to the desulfurization before entering multi-effect evaporating device give up
The step of water is preheated.So as to which desulfurization wastewater is gone before multi-effect evaporating device is entered to scale-forming ion and corrosive ions
Remove.
Preferably, the exhaust steam that multi-effect evaporating device is sent using power station is used as heating steam, using exhaust steam of electric power plant to desulfurization
Waste water carries out multiple-effect vacuum evaporating, concentrating and crystallizing, moisture in desulfurization wastewater is separated with salinity.It is weary so as to take full advantage of power plant
The heat energy of vapour, saves resource, avoids the waste of heat energy.
Further, the step of described desulfurization wastewater is evaporated into multi-effect evaporating device be：
Desulfurization wastewater advection enters multiple evaporating, concentrating and crystallizing devices of multi-effect evaporating device, head effect evaporating, concentrating and crystallizing dresses
The heating steam put is provided by external steam source, and indirect steam caused by previous effect enters next effect evaporating, concentrating and crystallizing device,
Dense salt slurry is using material mode is turned, and the mother liquor that salinity is improved through previous effect enters next effect evaporating, concentrating and crystallizing device, and end effect is steamed
The mother liquor of hair concentration and crystallization device enters equipment for separating liquid from solid.
Further, in each effect evaporating, concentrating and crystallizing device, the condensed water that heating steam is formed flows into level of condensation weighing apparatus
Bucket 9, condensed water balance caused flash-off steam in bucket 9 and return to heating chamber 7, condensed caused by previous effect evaporating, concentrating and crystallizing device
Water conservancy delivers to latter effect condensed water balance bucket 9 after being collected with condensed water balance bucket 9, condensed water caused by heating chamber 7 is imitated with latter
Next effect condensed water balance bucket 9 is delivered to after mixing shwoot some vapor.
Preferably, the condensed water in the condensed water balance bucket 9 of end effect evaporating, concentrating and crystallizing device introduces preheater 5 to entering
Desulfurization wastewater before multi-effect evaporating device is preheated.
Further, the steam of the vaporization chamber 8 of last effect evaporating, concentrating and crystallizing device enters vapour condensation device.
Further, the step of described desulfurization wastewater is handled through one-level chemical precipitation processing system 1 uses existing routine
Technology, generally comprise the steps：Desulfurization wastewater is introduced and neutralizes case, aqua calcis regulation pH is added in case to neutralizing
Value, while make Mg2+、Pb2+、Cr3+、Cd2+Plasma is precipitated out with hydroxide form, the F in waste water-Ion is with CaF2Shape
Formula is settled, and neutralizes the waste water for completing to react in case and enters flow tank, and organic sulfur is added into flow tank, makes remnants'
Pb2+、Cr3+、Cd2+It is precipitated out etc. heavy metal ion with sulphided form, the waste water that reaction is completed in flow tank enters flocculation
Case, into flocculation tanks, addition flocculant chloro sulphuric acid iron, flocculation aid PAM make sediment combine sedimentation, through the useless of flocculation tanks discharge
After the clarified device clarification of water, complete one-level chemical precipitation processing system 1 and handle.
Using two kinds of inner loop mode control system internal corrosive ions and fouling tendency type ion in treatment method
Concentration in limits：1 sets multi-effect evaporating device mother liquor reflux pipe to front end chemical precipitation processing system；2 solid-liquids point
From mother liquor reflux caused by device to chemical precipitation processing system.
As described above, it can preferably realize the present invention.
Claims (6)
1. a kind of desulfurization wastewater zero-discharge treatment system, it is characterised in that including the one-level chemical precipitation processing system set gradually
System (1), secondary chemical precipitation process system, multi-effect evaporating device and equipment for separating liquid from solid, in addition to by multi-effect evaporating device
Mother liquor introduce one-level chemical precipitation processing system (1) pipeline；
Described multi-effect evaporating device includes multiple evaporating, concentrating and crystallizing devices, each evaporating, concentrating and crystallizing device be provided with by
Its internal mother liquor introduces the pipeline of one-level chemical precipitation processing system (1), and described evaporating, concentrating and crystallizing device includes heating
Room (7), circulating pump (6) and vaporization chamber (8), the water inlet of the drainpipe connection circulating pump (6) of vaporization chamber (8), circulating pump (6)
Discharge outlet connects the water inlet pipe of heater, the water inlet pipe of the drainpipe connection vaporization chamber (8) of heater, and the row of vaporization chamber (8) steams
The steam input pipe of the heating chamber (7) of the next effect evaporating, concentrating and crystallizing device of steam pipe connection, head effect evaporating, concentrating and crystallizing devices
The steam input pipe of heating chamber (7) connects SS, is provided between adjacent two-effect evaporation concentration and crystallization device by previous effect
The mother liquor of evaporating, concentrating and crystallizing device introduces the pipeline of next effect evaporating, concentrating and crystallizing device, end effect evaporating, concentrating and crystallizing device
Mother liquor discharge pipe connects equipment for separating liquid from solid, the wastewater drainage pipe of secondary chemical precipitation process system and each effect evaporating, concentrating and crystallizing
Device connects；
Described evaporating, concentrating and crystallizing device also includes condensed water balance bucket (9), and the condensed water discharge pipe connection of heating chamber (7) is cold
Condensate balance bucket (9), condensed water balance bucket (9) are provided with flash-off steam discharge pipe, flash-off steam discharge pipe connection heating chamber (7)
Steam input pipe；
The latter effect of drainpipe connection of the condensed water balance bucket (9) of described previous effect evaporating, concentrating and crystallizing device is concentrated by evaporation knot
The condensed water balance bucket (9) of brilliant device, described desulfurization wastewater zero-discharge treatment system also include a preheater (5), two level
The discharging tube of chemical precipitation processing system is connected with evaporating, concentrating and crystallizing device again after connecting the preheater (5), and end effect evaporation is dense
The drainpipe of the condensed water balance bucket (9) of contracting crystallization apparatus connects the preheater (5) by pipeline and reconnects condensed water bucket afterwards
(14)；
Described one-level chemical precipitation processing system (1) includes neutralization case, flow tank, flocculation tanks and the one-level clarification set gradually
Device.
A kind of 2. desulfurization wastewater zero-discharge treatment system according to claim 1, it is characterised in that described secondary chemical
Precipitation process system includes second order reaction case (2), Secondary clarifier (3) and the filter (4) set gradually.
A kind of 3. desulfurization wastewater zero-discharge treatment system according to claim 1, it is characterised in that described multiple-effect evaporation
The exhaust steam discharge pipe in the steam input pipe connection power station of the heating chamber (7) of the first effect evaporating, concentrating and crystallizing device of device.
A kind of 4. desulfurization wastewater zero-discharge treatment system according to claim 1, it is characterised in that described separation of solid and liquid
Device includes the liquid discharge tube company of the thickener (10) and centrifuge (11) set gradually, thickener (10) and centrifuge (11)
Connect mother vat (12), the discharging tube connection multiple-effect evaporation concentration and crystallization device of mother vat (12).
A kind of 5. desulfurization wastewater zero-discharge treatment system according to claim 4, it is characterised in that described mother vat
(12) discharging tube also connects one-level chemical precipitation processing system (1) by pipeline.
6. a kind of desulfurization wastewater zero-discharge treatment system according to claim 5, it is characterised in that also including end effect steam
Condensing unit, row's steam pipe of the vaporization chamber (8) of the end effect evaporating, concentrating and crystallizing device of multi-effect evaporating device connect end effect steaming
Vapour condensing unit, the condensed water discharging tube connection condensed water bucket (14) of end effect vapour condensation device.
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| CN106630356B (en) * | 2017-01-12 | 2020-03-24 | 煤科集团杭州环保研究院有限公司 | Sludge incineration boiler flue gas desulfurization waste water zero release processing system |
| CN108619871B (en) * | 2017-03-23 | 2020-09-11 | 中国石油化工股份有限公司 | Method and device for treating flue gas and flue gas desulfurization wastewater |
| CN107935286B (en) * | 2017-12-01 | 2020-08-04 | 国核电力规划设计研究院有限公司 | Desulfurization wastewater treatment system for thermal power plant |
| CN109607925B (en) * | 2019-01-23 | 2021-07-23 | 成都锐思环保技术股份有限公司 | Desulfurization wastewater treatment method for producing qualified salt products |
| CN113087266A (en) * | 2021-04-30 | 2021-07-09 | 北京首钢国际工程技术有限公司 | Control method suitable for zero discharge of sintering pellet desulfurization and denitrification acid making wastewater |
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