CN109987772A - A kind of method of low-cost processes waste water - Google Patents

A kind of method of low-cost processes waste water Download PDF

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Publication number
CN109987772A
CN109987772A CN201910404917.0A CN201910404917A CN109987772A CN 109987772 A CN109987772 A CN 109987772A CN 201910404917 A CN201910404917 A CN 201910404917A CN 109987772 A CN109987772 A CN 109987772A
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CN
China
Prior art keywords
waste water
water
flue gas
low
cost processes
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Pending
Application number
CN201910404917.0A
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Chinese (zh)
Inventor
刘晨
李剑斌
马飞
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Jiangsu Zhengshi Environmental Protection Technology Co Ltd
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Jiangsu Zhengshi Environmental Protection Technology Co Ltd
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Priority to CN201910404917.0A priority Critical patent/CN109987772A/en
Publication of CN109987772A publication Critical patent/CN109987772A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D1/00—Evaporating
    • B01D1/16—Evaporating by spraying
    • B01D1/18—Evaporating by spraying to obtain dry solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/60—Simultaneously removing sulfur oxides and nitrogen oxides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/80—Semi-solid phase processes, i.e. by using slurries
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2258/00—Sources of waste gases
    • B01D2258/02—Other waste gases
    • B01D2258/0283—Flue gases
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • 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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/043—Details
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/10—Treatment of water, waste water, or sewage by heating by distillation or evaporation by direct contact with a particulate solid or with a fluid, as a heat transfer medium
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/16—Treatment of water, waste water, or sewage by heating by distillation or evaporation using waste heat from other processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds

Abstract

The invention discloses a kind of method of low-cost processes waste water, the wastewater treatment method comprises the steps of: step 1: pre-processing to waste water；Step 2: treated waste water being sent into concentration tower and is concentrated；Step 3: the waste water after concentration being carried out dry in spray drying tower internal spraying；Step 4: pyrolysis and thermal oxide are carried out to organic toxic ingredient in waste water；Step 5: the flue gas containing water vapour, salinity is separated into dry salt in deduster；Step 6: desulphurization denitration is carried out to the flue gas of moisture vapor；Step 7: condensed water in recovered flue gas simultaneously removes remaining pollutant in waste water；Step 8: treated water as recirculated water carry out using.The method of the low-cost processes waste water ensure that recycling for the energy convenient for the recycling of water, achieve the purpose that low-cost processes waste water, makes the flue gas of discharge cleaner, reaches purifying smoke, reduce the discharge of PM2.5, reduce the purpose of the generation of haze.

Description

A kind of method of low-cost processes waste water
Technical field
The present invention relates to technical field of waste water processing, specially a kind of method of low-cost processes waste water.
Background technique
Wastewater treatment generally consists of three parts at present: pretreatment, biochemical treatment and advanced treating, waste water is using existing Processing method is not only invested more, at high cost, cannot more crucially completely remove harmful components, is required according to environmentally friendly new rule necessary Ability reuse after advanced treating, enterprise need to increase investment and operating cost, and high temperature pyrolysis and burning are to handle organic toxic One of waste advanced treating most effectual way is widely used in developed countries such as Japan and Korea S, but for fuel thermal decomposition and burns outside dependence This is very high for firing, therefore, it is proposed that a kind of method of low-cost processes waste water, in order to solve the problems, such as to propose among the above.
Summary of the invention
The purpose of the present invention is to provide a kind of methods of low-cost processes waste water, to solve above-mentioned background technique proposition Current wastewater treatment method not only invests more, higher cost, and can not completely remove harmful components, is unfavorable for guaranteeing ring The problem of protecting effect.
To achieve the above object, the invention provides the following technical scheme: a kind of method of low-cost processes waste water, described useless Method for treating water comprises the steps of:
Step 1: waste water is pre-processed；
Step 2: treated waste water being sent into concentration tower and is concentrated；
Step 3: the waste water after concentration being carried out dry in spray drying tower internal spraying；
Step 4: pyrolysis and thermal oxide are carried out to organic toxic ingredient in waste water；
Step 5: the flue gas containing water vapour, salinity is separated into dry salt in deduster；
Step 6: desulphurization denitration is carried out to the flue gas of moisture vapor；
Step 7: condensed water in recovered flue gas simultaneously removes remaining pollutant in waste water；
Step 8: treated water as recirculated water carry out using.
Preferably, in the step 1 to carry out pretreatment to waste water and precipitated to carry out precipitating filtering to wastewater slurry It filters the mud generated or sludge is returned and is recycled in coal.
Preferably, treated in the step 2, and waste water is concentrated by pressurizeing to be pumped into concentration tower, and in cryogenic conditions Under be concentrated into 10-15 times.
Preferably, the rear end of the spray drying tower in the step 3 is provided with deduster, and boiler smoke passes through air preheater Enter drying tower afterwards, and waste water in pump pressure atomization to spray drying tower by being dried.
Preferably, the waste water is injected in spray drying tower by using double-current air atomization spray gun, and atomizing lance Exit gas temperature is in drying regime.
Preferably, the step 4 carries out simultaneously with step 3, and using in low-temperature flue gas after boiler air preheater waste heat and Residual oxygen, which is realized, carries out pyrolysis and thermal oxide to organic toxic ingredient (COD, BOD) in waste water, and organic toxic ingredient is turned Become carbon dioxide and water, while the low-temperature flue gas is not less than 120 DEG C.
Preferably, the flue gas containing water vapour, salinity is entered into deduster in the step 5 together, utilizes deduster pair Dry salinity carries out capture collection, achievees the purpose that remove the salinity in waste liquid.
Preferably, the operating procedure for carrying out desulphurization denitration to the flue gas of moisture vapor in the step 6 is in order to by flue gas Middle sulfur dioxide, nitrogen oxides and desulfurization slurry chemically react in desulfurizing tower, generate ammonium sulfate, ammoniumnitrate prill, reach It is separated in the form of carnallite, is periodically discharged from tower bottom, convenient for the recycling of carnallite by drying by going out salt system after to a certain concentration And processing, advantageously ensure that environmental protection.
Preferably, the condensed water in the step 7 in recovered flue gas and to remove remaining pollutant in waste water be that flue gas is de- Enter dehumidifying after sulphur and take off white system, by carrying out direct spray washing cooling dehumidification by condensation to flue gas, by the solubility in flue gas Salinity and pollutant wash into water, make the flue gas of discharge cleaner, reach purifying smoke, reduce the discharge of PM2.5, reduce The generation of haze, while the water capacity of flue gas is reduced, achieve the effect that condensed water while dehumidifying takes off white in recovered flue gas, reaches To the purpose of low-cost processes waste water.
Preferably, the condensed water and Sprayer Circulation water that the step 8 recycles enter in circulating water pool together, and pass through circulation The water pump of basin bottom extracts condensed water out, and is sent into desulfurizing tower when desulfurization moisturizing is used or outer for following after simple filtration Ring water moisturizing.
Compared with prior art, the beneficial effects of the present invention are: the method for the low-cost processes waste water, using in boiler sky It is concentrated in low-temperature flue gas after pre- device, is spray-dried the direct spray washing cooling condensing recovery flue gas condensing of desalination, flue gas after desulfurization The technique of water ensure that recycling for the energy convenient for the recycling of water；Using low temperature flue gas Heat Treatment waste water, reach To the purpose of low-cost processes waste water；Direct spray washing flue gas is utilized simultaneously, by the soluble organic fraction and pollutant in flue gas It washs in water, makes the flue gas of discharge cleaner, reach purifying smoke, reduce the discharge of PM2.5, reduce the mesh of the generation of haze 's；
1, fume afterheat is directly utilized, low energy consumption, and low temperature concentration directly can be directly carried out using fume afterheat and is done by spraying Dry desalination, convenient for reducing consumption；
2, process is simple, easy to operate, and device therefor process is reduced, and small investment, operation and maintenance cost is low, and to take up an area Area is reduced, and advantageously reduces cost；
4, reducing desulphurization system technique water consume ensure that recycling for the energy convenient for the recycling of water, convenient for reducing Consumption；
5, desalination is dried by the high-pressure atomization to waste water, while ensure that effect, so that being not easy inside tower body Fouling advantageously ensures that service life, convenient for being used for a long time；
6, carnallite can be transferred to synthetical recovery in ash, be convenient for recycling, and can individually solidify buried or give professional solid waste The processing of processing company, advantageously ensures that environmental protection.
7, by the direct spray washing to flue gas, the soluble organic fraction carried in flue gas and pollutant is washed into spray and followed In ring water, make the flue gas being discharged into atmosphere cleaner.The discharge for reducing PM2.5, reduces the generation of haze
Specific embodiment
Below in conjunction with the embodiment of the present invention, technical scheme in the embodiment of the invention is clearly and completely described, Obviously, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based in the present invention Embodiment, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, all Belong to the scope of protection of the invention.
The present invention provides a kind of technical solution: a kind of method of low-cost processes waste water, the wastewater treatment method include Following steps:
Step 1: waste water is pre-processed；
Step 2: treated waste water being sent into concentration tower and is concentrated；
Step 3: the waste water after concentration being carried out dry in spray drying tower internal spraying；
Step 4: pyrolysis and thermal oxide are carried out to organic toxic ingredient in waste water；
Step 5: the flue gas containing water vapour, salinity is separated into dry salt in deduster；
Step 6: desulphurization denitration is carried out to the flue gas of moisture vapor；
Step 7: condensed water in recovered flue gas simultaneously removes remaining pollutant in waste water；
Step 8: treated water as recirculated water carry out using.
In this programme in step 1 to carry out pretreatment to waste water and precipitated to carry out precipitating filtering to wastewater slurry It filters the mud generated or sludge is returned and is recycled in coal, convenient for carrying out pretreatment purification to waste water.
Treated in step 2 in this programme, and waste water is concentrated by pressurizeing to be pumped into concentration tower, and under cryogenic It is concentrated into 10-15 times, waste water is concentrated using the waste heat inside flue gas, convenient for saving the energy, and is conducive to wastewater treatment The efficient progress of system, rapidly enters drying tower convenient for waste water,
The rear end of spray drying tower in step 3 is provided with deduster, and boiler smoke enters drying after air preheater Tower, and waste water, by being dried in pump pressure atomization to spray drying tower, waste water is by using double-current air atomizing Spray gun is injected in spray drying tower, and it is rapid to pass through high temperature convenient for moisture in drying regime for atomizing lance exit gas temperature Evaporation；By carrying out spray drying desalination using the waste heat of low-temperature flue gas, it is possible to reduce the operating cost of this method.
Step 4 carries out simultaneously with step 3 in this programme, and utilizes the waste heat and residual oxygen in low-temperature flue gas after boiler air preheater It realizes and pyrolysis and thermal oxide is carried out to organic toxic ingredient (COD, BOD) in waste water, and organic toxic ingredient is transformed into Carbon dioxide and water, while the low-temperature flue gas is not less than 120 DEG C, and the hot oxygen of organic principle is realized using low temperature exhaust heat and residual oxygen Change, convenient for being removed to organic toxic ingredient, convenient for guaranteeing water treatment effect.
The flue gas containing water vapour, salinity is entered into deduster together in step 5 in this programme, using deduster to drying Salinity carry out capture collection, achieve the purpose that remove waste liquid in salinity；
The operating procedure for carrying out desulphurization denitration to the flue gas of moisture vapor in step 6 in this programme is in order to by flue gas two Sulfur oxide, nitrogen oxides and desulfurization slurry chemically react in desulfurizing tower, generate ammonium sulfate, ammoniumnitrate prill, reach one Determine to separate in the form of carnallite by going out salt system to dry after concentration, be periodically discharged from tower bottom, recycling and place convenient for carnallite Reason, advantageously ensures that environmental protection.
Condensed water in this programme in step 7 in recovered flue gas simultaneously removes after remaining pollutant in waste water is flue gas desulfurization White system is taken off into dehumidifying, by carrying out direct spray washing cooling dehumidification by condensation to flue gas, by the soluble salt in flue gas Divide and pollutant washing is into water, makes the flue gas of discharge cleaner, reach purifying smoke, reduce the discharge of PM2.5, reduce haze Generation, while reducing the water capacity of flue gas, achieve the effect that condensed water while dehumidifying takes off white in recovered flue gas, reach low At the purpose of present treatment waste water.
The condensed water and Sprayer Circulation water that step 8 recycles in this programme enter in circulating water pool together, and pass through recirculated water The water pump of bottom of pond portion extracts condensed water out, and is sent into desulfurizing tower when desulfurization moisturizing is used or outer for recycling after simple filtration Water moisturizing advantageously reduces desulphurization system technique water consume.
When using the method for the low-cost processes waste water, Wastewater Pretreatment is to precipitated to wastewater slurry The mud generated in the precipitating filter process or sludge are returned in coal and are recycled, then will given up by force (forcing) pump by filter Water is sent into concentration in concentration tower, it is made to be concentrated into 10-15 times；The moisture of low-temperature evaporation and flue gas enter desulfurization in concentration process Tower；
Waste water after concentration is spray-dried in the drying tower after pump housing pressurization is sent to air preheater, guarantees mist Change lance outlet flue-gas temperature in drying regime；By the high-pressure atomization to waste water, evaporate it rapidly；It is empty using boiler simultaneously Waste heat and residual oxygen after pre- device in low-temperature flue gas, which are realized, carries out pyrolysis and hot oxygen to organic toxic ingredient (COD, BOD) in waste water Change, so that organic toxic ingredient is transformed into carbon dioxide and water, guarantee the removal to organic toxic ingredient, convenient for guaranteeing at waste water Manage effect；
Water vapour, salinity and flue gas after pervaporation enter deduster together, using deduster to dry salinity into Row, which captures, to be collected, and achievees the purpose that remove the salinity in waste liquid；
The flue gas containing a large amount of water vapours in concentration tower, which enters, carries out desulfurization in desulfurizing tower, so that the titanium dioxide in flue gas Sulphur, nitrogen oxides chemically react in desulfurizing tower with desulfurization slurry, generate ammonium sulfate, ammoniumnitrate prill, reach certain dense It is handled by desalting system by drying to separate in the form of carnallite after degree,
Then it is condensed by cooling down to the direct spray washing of desulfurizing tower exiting flue gas, reduces the water capacity of flue gas, simultaneously will Soluble organic fraction in flue gas is washed into recirculated water, makes the flue gas of discharge cleaner, while achieving the effect that dehumidifying takes off white Condensed water in recovered flue gas, the condensed water and Sprayer Circulation water of recycling enter in circulating water pool together, pass through circulating water pool bottom The water pump in portion extracts condensed water out, and desulfurizing tower is sent into after simple filtration when desulfurization moisturizing use or supplies to do circulating cooling make-up water outside, In order to the recycling of water, recycling for the energy ensure that, here it is the entire works of the method for the low-cost processes waste water Make process.
The content being not described in detail in this specification belongs to the prior art well known to professional and technical personnel in the field, needs Illustrate, herein, relational terms such as first and second and the like be used merely to by an entity or operation with Another entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this realities The relationship or sequence on border.Moreover, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability Contain, so that the process, method, article or equipment for including a series of elements not only includes those elements, but also including Other elements that are not explicitly listed, or further include for elements inherent to such a process, method, article, or device. In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element Process, method, article or equipment in there is also other identical elements.
Although the present invention is described in detail referring to the foregoing embodiments, for those skilled in the art, It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc. With replacement, all within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in this Within the protection scope of invention.

Claims (10)

1. a kind of method of low-cost processes waste water, it is characterised in that: the wastewater treatment method comprises the steps of:
Step 1: waste water is pre-processed；
Step 2: treated waste water being sent into concentration tower and is concentrated；
Step 3: the waste water after concentration being carried out dry in spray drying tower internal spraying；
Step 4: pyrolysis and thermal oxide are carried out to organic toxic ingredient in waste water；
Step 5: the flue gas containing water vapour, salinity is separated into dry salt in deduster；
Step 6: desulphurization denitration is carried out to the flue gas of moisture vapor；
Step 7: condensed water in recovered flue gas simultaneously removes remaining pollutant in waste water；
Step 8: treated water as recirculated water carry out using.
2. a kind of method of low-cost processes waste water according to claim 1, it is characterised in that: pair in the step 1 Waste water carry out pretreatment be to carry out precipitating filtering to wastewater slurry, and precipitate mud that filtering generates or sludge return in coal into Row recovery processing.
3. a kind of method of low-cost processes waste water according to claim 1, it is characterised in that: handled in the step 2 Waste water afterwards is pumped into concentration in concentration tower by pressurization, and is concentrated into 10-15 times under cryogenic.
4. a kind of method of low-cost processes waste water according to claim 1, it is characterised in that: the spray in the step 3 The rear end of mist drying tower is provided with deduster, and boiler smoke enters drying tower after air preheater, and waste water is added by pump Pressure, which is sprayed in spray drying tower, to be dried.
5. a kind of method of low-cost processes waste water according to claim 4, it is characterised in that: the waste water by using Double-current air atomization spray gun is injected in spray drying tower, and atomizing lance exit gas temperature is in drying regime.
6. a kind of method of low-cost processes waste water according to claim 5, it is characterised in that: the step 4 and step 3 Carry out simultaneously, and using in low-temperature flue gas after boiler air preheater waste heat and residual oxygen realize to organic toxic ingredient in waste water (COD, BOD) carries out pyrolysis and thermal oxide, and organic toxic ingredient is made to be transformed into carbon dioxide and water, while the low temperature cigarette Gas is not less than 120 DEG C.
7. a kind of method of low-cost processes waste water according to claim 6, it is characterised in that: will contain in the step 5 There is the flue gas of water vapour, salinity to enter deduster together, capture collection is carried out to dry salinity using deduster, reaches removal The purpose of salinity in waste liquid.
8. a kind of method of low-cost processes waste water according to claim 1, it is characterised in that: to containing in the step 6 The operating procedure that the flue gas of water vapour carries out desulphurization denitration is in order to which sulfur dioxide in flue gas, nitrogen oxides and desulfurization slurry exist It chemically reacts in desulfurizing tower, generation ammonium sulfate, ammoniumnitrate prill, reaches miscellaneous with drying by going out salt system after a certain concentration Salt form is separated, and is periodically discharged from tower bottom, convenient for the recycling and processing of carnallite, advantageously ensures that environmental protection.
9. a kind of method of low-cost processes waste water according to claim 1, it is characterised in that: recycled in the step 7 Condensed water in flue gas and to remove remaining pollutant in waste water be to enter dehumidifying after flue gas desulfurization to take off white system, by flue gas Direct spray washing cooling dehumidification by condensation is carried out, the soluble salinity and pollutant in flue gas is washed into water, allows discharge Flue gas it is cleaner, reach purifying smoke, reduce the discharge of PM2.5, reduce the generation of haze, at the same reduce flue gas containing wet Amount achievees the effect that condensed water while dehumidifying takes off white in recovered flue gas, achievees the purpose that low-cost processes waste water.
10. a kind of method of low-cost processes waste water according to claim 1, it is characterised in that: what the step 8 recycled Condensed water and Sprayer Circulation water enter in circulating water pool together, and are extracted out condensed water by the water pump of circulating water pool bottom, and And desulfurizing tower is sent into after simple filtration when desulfurization moisturizing is used or outer for doing circulating cooling make-up water.
CN201910404917.0A 2019-05-16 2019-05-16 A kind of method of low-cost processes waste water Pending CN109987772A (en)

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