CN108558110A - A kind of ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system and method - Google Patents

A kind of ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system and method Download PDF

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Publication number
CN108558110A
CN108558110A CN201810651108.5A CN201810651108A CN108558110A CN 108558110 A CN108558110 A CN 108558110A CN 201810651108 A CN201810651108 A CN 201810651108A CN 108558110 A CN108558110 A CN 108558110A
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desulfurization wastewater
cfb boiler
ultra supercritical
supercritical cfb
evaporator
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杨冬
谢海燕
梁梓宇
万李
刘丹
欧阳诗洁
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Xian Jiaotong University
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Xian Jiaotong University
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00Multistage treatment of water, waste water, or sewage
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/043Details
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/02Treatment of water, waste water, or sewage by heating
    • C02F1/04Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • C02F1/048Purification of waste water by evaporation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/20Treatment of water, waste water, or sewage by degassing, i.e. liberation of dissolved gases
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/44Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/444Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/46Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4693Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis electrodialysis
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/58Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62Heavy metal compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/58Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62Heavy metal compounds
    • C02F1/64Heavy metal compounds of iron or manganese
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/66Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/12Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • C02F11/122Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00Nature of the contaminant
    • C02F2101/10Inorganic compounds
    • C02F2101/101Sulfur compounds
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/18Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/02Softening water by precipitation of the hardness

Abstract

The invention discloses a kind of ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system and methods, including sequentially connected chemical pretreatment system, membrane filtration system, electrodialysis system, desulfurization wastewater pre-heating system, desulfurization wastewater evaporator, equipment for separating liquid from solid and vapour condensation device;The present invention is evaporated crystallization as heat source using the high-temperature flue gas of ultra supercritical CFB boiler Cyclone outlet position to desulfurization wastewater, using the superheated steam at ultra supercritical CFB boiler Late reworking inlet header as the heat source of preheating desulfurization wastewater, and add the membrane filtration system for possessing micro-filtration and the electrodialysis system for concentrating decrement, it is big to overcome energy consumption existing for existing multiple-effect evaporation technology, the costly defect of equipment investment, desulfuration efficiency can be improved, effectively avoid equipment scaling, reduction system handles load, significantly improve economic benefit, energy saving and operating cost.

Description

A kind of ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system and method
Technical field
The invention belongs to Sector of Cfb Boilers, and in particular to a kind of ultra supercritical CFB boiler desulfurization wastewater Zero-discharge treatment system and method.
Background technology
In recent years, recirculating fluidized bed (CFB) boiler is because its fuel tolerance is good and energy-saving and environment-friendly advantage has obtained rapidly Development, is the important channel that China colm fuel realizes that high-efficiency cleaning utilizes, and development trend is to high parameter large capacity direction It draws close.Supercritical CFB Boiler unit in China's has been gone into operation 13 up to now, reaches world lead level, with going deep into for research It is needed with market, ultra supercritical CFB boiler has become the primary study object of countries in the world.SO2Pollution as power plant emission One of object can all cause huge injury to human body, plant or even environment, strictly control SO2Discharge be global sustainable development The inevitable choice of exhibition.For SO2The processing of pollutant, ultra supercritical CFB boiler, which generally uses, sprays limestone desulfurization technology in stove, Belong to desulfurization by dry method, this method corrosivity is relatively low and does not have discharge of wastewater, but desulfuration efficiency is not high enough, reaction speed is slow And absorbent consumption is big, SO2Concentration of emission is unable to reach the environmental requirement of some areas, ought especially use some high-sulfur low-heat It is become apparent when the fuel that the CFB boilers such as the inferior fuel of value such as gangue, slime, oil shale, bone coal, petroleum coke are applicable in, SO2Discharge beyond standards will cause blowdown cost and investment operating cost to greatly improve.And limestone utilization is low, large quantities of lime stone Powder is added in boiler furnace to reduce SO2Concentration of emission, the high Ca/S brought can influence boiler combustion, lead to boiler combustion efficiency It reduces, increases coal consumption, heating surface system wear aggravates, and causes other boiler component dust stratifications serious, and final influence boiler is steady for a long time Fixed operation, and the lime-ash integrated application value formed is relatively low, can also cause new aasolidawaste disposal problem.
It can then be solved the above problems using Wet Flue Gas Desulfurization Technology.Lime stone-gypsum wet flue gas desulfurizing technology is Technology is most ripe in the world and most widely used desulfurization technology at this stage, is suitable for any unit capacity and sulfur content coal Flue gas desulfurization.It is good to load variations applicability using such technology desulfuration efficiency height, boiler controller system fortune is not influenced equipped with bypass Row, is not limited by coal, and the by-product gypsum impurity content after desulfurization lacks that quality is more excellent, and application value height can bring for power plant More considerable income.In order to ensure equipment safety operation, prevent equipment corrosion from accelerating and influencing gypsum qualitt, in the mistake of desulfurization Cheng Zhongxu periodically discharges a certain amount of desulfurization wastewater into desulfurization wastewater treatment system, and desulfurization waste water quality is weakly acidic, salt content Up to 25000~55000mg/L, suspension content are up to tens thousand of mg/L, contain a large amount of Cl、F、SO3 2-、SO4 2-、Ca2+、Mg2+ Plasma and suspended matter, COD (COD), nitrite, fluoride, heavy metal element (As, Pb, Hg, Cd, Cr, Ni, Co, Zn etc.) it is exceeded, easily fouling and have strong corrosive, it is necessary to through processing it is up to standard after could discharge.
Existing method for treating desulfurized wastewater includes mainly chemical precipitation method, biological treatment, flue evaporation and steam Concentration and evaporation method etc..Domestic majority power plant are all made of chemical precipitation method processing desulfurization wastewater, but waste water is after the processing of the method still Direct emission containing high concentration salinity can influence environment;Biological treatment system complex, cost are higher, easily form toxic Organic Selenium And organic mercury, cause secondary pollution.Flue evaporation and steam concentration and evaporation method can all realize desulfurization wastewater zero-emission, but the former System corrosion is heavier, processing capacity is limited and utilization of fly ash is impacted;The multiple-effect evaporation technology of the latter although can bring compared with High heat transfer coefficient and the thermal efficiency, flexible and convenient operation, but also there is the higher easy fouling of equipment, energy consumption, operation and cost of investment The shortcomings of high cost.
Invention content
The present invention is asked for existing ultra supercritical CFB boiler using above-mentioned caused by spray limestone desulfurization technology in stove The shortcoming of topic and existing method for treating desulfurized wastewater, it is proposed that a kind of to utilize ultra supercritical CFB boiler cyclone separator It exports high-temperature flue gas and drives desulfurization wastewater evaporative crystallization as heat source, and preheated and taken off using the superheated steam of Late reworking import The desulfurization wastewater zero-discharge treatment system and method for sulphur waste water, the system can improve desulfuration efficiency, effectively avoid system equipment knot Dirt, made using high-temperature flue gas heat source can only with 1st effective evaporator can sufficient evaporation desulfurization wastewater reduce investment operating cost, Multifunctional evaporating equipment investment cost height and the big defect of energy consumption are overcome, is carried for ultra supercritical CFB boiler desulfurization wastewater zero-emission A kind of novel safe and efficient approach is supplied.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system, including the chemical pretreatment system that sets gradually System, membrane filtration system, electrodialysis system, desulfurization wastewater pre-heating system, desulfurization wastewater evaporator, equipment for separating liquid from solid and steam are cold Solidifying device;
The chemical pretreatment system includes buffer pool, Softening box, filter press and adjuster, buffer pool, Softening box and Adjuster is sequentially connected, and Softening box send sludge to filter press, and sludge is discharged in the outlet end of filter press;Adjuster and membrane filtration system System is connected;
The electrodialysis system will treated desulfurization wastewater first after vacuum degassing machine degassing process again through waste water pump It is delivered to desulfurization wastewater pre-heating system;
The desulfurization wastewater pre-heating system includes preheater, and preheater is connected with desulfurization wastewater evaporator;
The salt pulp liquor that the desulfurization wastewater evaporator generates is directed to equipment for separating liquid from solid, the indirect steam quilt of generation It send to vapour condensation device;
The vapour condensation device includes condenser and reuse pool, and condenser inlet end connects desulfurization wastewater evaporator Steam fairlead, the condensation-water drain end of condenser connects reuse pool.
The Softening box is equipped with electric mixing device, and it is anti-that composite reagent and the desulfurization wastewater for input carry out chemistry It answers.
The membrane filtration system uses micro-filtration.
The preheater is equipped with superheated steam and introduces pipe and fairlead, and superheated steam introduces pipe connection ultra supercritical CFB Late reworking inlet header in boiler, superheated steam fairlead connect the steaming arranged in air preheater in ultra supercritical CFB boiler Vapour soot blower.
The desulfurization wastewater evaporator is equipped with high-temperature flue gas and introduces pipe and high-temperature flue gas fairlead, desulfurization wastewater evaporator High-temperature flue gas be introduced into pipe connection ultra supercritical CFB boiler in Cyclone outlet position high-temperature flue gas discharge pipe, high temperature Flue gas fairlead is connected to ultra supercritical CFB boiler back-end ductwork.
The equipment for separating liquid from solid includes centrifuge and drying machine.
The equipment for separating liquid from solid is equipped with a wastewater mother liquor fairlead and connects desulfurization wastewater evaporator.
A kind of processing method using ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system includes the following steps:
1) desulfurization wastewater after lime stone-gypsum wet flue gas desulfurizing enters buffer pool, carries out Air Exposure, uniformly Water quality;Desulfurization wastewater enters Softening box later, and NaOH solution, Na are added into case2CO3The composite reagent of solution and organic sulfur, goes Except the heavy metal ion in waste water, while corresponding precipitation is generated, adjusts pH value to 9~11;The sludge generated in Softening box is sent It is discharged after carrying out press filtration to filter press;Enter adjuster after the softened case processing of desulfurization wastewater, by the way that hydrochloric acid solution is added by pH Value is adjusted to 6~8;
2) waste water of adjuster enters membrane filtration system and is filtered processing, reduces the pollution index of desulfurization wastewater;
3) treated that waste water is sent to electrodialysis system for membrane filtration system, make desulfurization wastewater under electric field force effect respectively By cation-exchange membrane and anion-exchange membrane to carry out the desalination and concentration of desulfurization wastewater respectively, the fresh water of generation is direct Recycling is used for boiler of power plant make-up water, the concentrated water of generation then send to vacuum degassing machine remove incoagulable gas in desulfurization wastewater and Boiling point is less than the volatile components of water, and the desulfurization wastewater after vacuum degassing machine degassing process is sent to waste water pump, and waste water pump will take off Sulphur waste water, which is sent to preheater, to be preheated;
4) desulfurization wastewater is sent to preheater by waste water pump, and the desulfurization wastewater after preheating is sent to desulfurization wastewater evaporation Device;
5) enter the desulfurization wastewater of desulfurization wastewater evaporator by heating evaporation, treated the desulfurization of desulfurization wastewater evaporator is useless Water dope is sent to equipment for separating liquid from solid, and the indirect steam of generation is sent to vapour condensation device;
6) the dense salt slurries that desulfurization wastewater is formed after desulfurization wastewater evaporator evaporation process enter equipment for separating liquid from solid into Row is separated by solid-liquid separation, and obtains solid crystal salt after centrifuge and drying machine processing, the wastewater mother liquor isolated introduces desulfurization wastewater Evaporator is evaporated again;The indirect steam that desulfurization wastewater evaporator generates is sent to the condenser in vapour condensation device, The condensed water that condensation is formed enters reuse pool.
Step 6) is separated by solid-liquid separation obtained wastewater mother liquor and send to continuing to evaporate in desulfurization wastewater evaporator;After electrodialysis system The vacuum degassing machine being equipped with is used to remove incoagulable gas in desulfurization wastewater and boiling point is less than the volatile components of water.
The heat source of preheater uses the superheated steam at Late reworking inlet header in ultra supercritical CFB boiler;Overheat After steam is used to preheat desulfurization wastewater, then leads to the steam sootblower arranged in air preheater and carry out air preheater soot blowing;
The heat source of desulfurization wastewater evaporator is the high-temperature flue gas of Cyclone outlet position in ultra supercritical CFB boiler; High-temperature flue gas after heating desulfurization wastewater, which is sent by high-temperature flue gas fairlead to ultra supercritical CFB boiler back-end ductwork, to be continued to participate in Flue gas flow.
The present invention has the following advantages and beneficial effect:
The present invention is directed to using its zero-emission of the ultra supercritical CFB boiler desulfurization wastewater system research of Wet Flue Gas Desulfurization Technology Put treatment process, including sequentially connected chemical pretreatment system, membrane filtration system, electrodialysis system, desulfurization wastewater preheating system System, desulfurization wastewater evaporator, equipment for separating liquid from solid and vapour condensation device.The indirect steam that desulfurization wastewater evaporator generates enters Condenser is condensed, and the condensed water of generation is sent to reuse pool, can be back to power plant or qualified discharge;And treated mother liquor It is directed to equipment for separating liquid from solid.The processed desulfurization wastewater of electrodialysis system first through vacuum degassing machine remove incoagulable gas after again It is delivered to preheater by waste water pump.
Further, the heat source of desulfurization wastewater evaporator is using the high temperature after cyclone separator in ultra supercritical CFB boiler Flue gas, can greatly improve heat transfer temperature difference and greatly reduce energy consumption, efficiently use flue gas heat, avoid heat by about 850 DEG C or so It can waste, energy saving and cost, reduction equipment investment and operating cost.High-temperature flue gas after its heating desulfurization wastewater passes through height Warm flue gas fairlead is connected to ultra supercritical CFB boiler back-end ductwork and continues to participate in flue gas flow, realizes the effective of high-temperature flue gas It utilizes.And treated that desulfurization wastewater is recycled, the solid crystal salt of generation can be used as Nacl sale, be ultra supercritical CFB boiler desulfurization wastewater zero-emission provides a kind of method of economical and efficient, is conducive to energy-saving and emission-reduction.
Further, the heat source of preheater is using the overheat at Late reworking inlet header in ultra supercritical CFB boiler Steam, superheated steam is generally used for air preheater soot blowing at this, but because after soot blowing steam temperature can rise therefore need to increase spray water flux. After first being used for superheated steam herein to preheat desulfurization wastewater as a result, then leads to the steam sootblower arranged in air preheater and carry out Air preheater soot blowing will be such that steam temperature no longer increases and save spray water flux, economy of power plant benefit can be improved.
Membrane filtration system uses micro-filtration, filtration treatment to be better than mechanical filter, and effluent quality turbidity value is much smaller than common The effluent quality of mechanical filter.
Further, chemical pretreatment system includes buffer pool, Softening box, filter press and adjuster.Wherein buffer pool Effect is to collect the desulfurization wastewater after wet process of FGD, and carry out the uniform water quality of Air Exposure, keeps follow-up equipment operation steady It is fixed;The effect of Softening box is by adding NaOH solution, Na2CO3The composite reagent of solution and organic sulfur (TMT-15), removal are useless Heavy metal ion such as Pb in water3+、Fe3+、Cr3+、Cd2+、Ni+、Hg2+、Pb2+、Cu2+, while corresponding precipitation is generated, adjust pH value To 10.0 or so.Softening box is additionally provided with electric mixing device simultaneously, thorough convenient for the composite reagent and desulfurization wastewater progress of input Chemical reaction;The effect of filter press is will to generate to precipitate containing heavy metal element in Softening box to press with sludge such as suspended matters It is discharged after filter;The effect of adjuster is that pH value is pulled back to 6~8 by the way that hydrochloric acid solution is added.
Further, the effect of membrane filtration system is filtering desulfurization wastewater, removes suspended matter, macromolecule in desulfurization wastewater Organic matter, colloid, particle, particle reduce the pollution index of desulfurization wastewater.The water quality index of desulfurization wastewater after pretreatment can Controlled, heavy metal element, inorganic salts, fouling tendency ion etc. are completely removed, and waste water hardness is removed, avoid its into Enter follow-up equipment fouling and corrosion occur and influence heat transfer and cause damages.And membrane filtration system uses micro-filtration, at filtering Reason is better than traditional mechanical filter such as flocculation sediment and media filtration, can retain particle and the bacterium etc. between 0.1~10 micron, go out Water water turbidity value is much smaller than the effluent quality of standard machinery filtering.
Further, electrodialysis system has a fresh water discharge pipe and a concentrated water discharge pipe, and desulfurization wastewater is by electricity The fresh water generated after osmosis system processing is recyclable for boiler feedwater, and concentrated water is then sent to vacuum degassing machine.Electrodialysis system Compared to others decrement concentration technology power consumption and medicament network minimal, therefore effectively controlled investment cost it can improve economic effect Benefit.It is based on ion exchange and to rely on potential difference, and desulfurization wastewater is made to pass through cation-exchange membrane respectively under electric field force effect With anion-exchange membrane to carry out the desalination and concentration of desulfurization wastewater respectively, it can be used for separation and purifying desulphurized waste water, to it Carry out concentration minimizing processing.
Further, it is provided with vacuum degassing machine after electric osmose permeable system, can be used for removing the incoagulability gas in desulfurization wastewater Body and boiling point are less than the volatile components of water, and the desulfurization wastewater after vacuum degassing machine degassing process is pumped to preheating by waste water Device is preheated.
Further, equipment for separating liquid from solid includes centrifuge and drying machine, the drain pipe connection desulfurization wastewater evaporation of device Device.The dense salt slurries of output are separated by solid-liquid separation by centrifuge in desulfurization wastewater evaporator, and the industrial crystallization salt isolated can For selling, the waste water saline solution isolated is sent by drain pipe to being evaporated again in desulfurization wastewater evaporator, and saline solution is concentrated Promote purity.
Further, ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system further includes vapour condensation device, connection The steam fairlead of desulfurization wastewater evaporator, the condensed water that vapour condensation device generates send to reuse pool through drain pipe, can make It is discharged after being back to power plant or water quality reaching standard for boiler feedwater.
Description of the drawings
Fig. 1 is the overall structure diagram of the present invention.
Label and corresponding parts title in attached drawing:
1- buffer pools, 2- Softening boxs, 3- filter presses, 4- adjusters, 5- membrane filtration systems, 6- electrodialysis systems, 7- vacuum Degasser, 8- waste water pumps, 9- preheaters, 10- desulfurization wastewater evaporators, 11- equipment for separating liquid from solid, 12- condensers, 13- reuses Pond, 14- ultra supercritical CFB boilers, 15- Late reworkings, 16- air preheaters, 17- cyclone separators.
Specific implementation mode
The present invention is described in further detail below in conjunction with the accompanying drawings, and embodiments of the present invention are not limited thereto.
As shown in Figure 1, a kind of ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system of the present invention, including connect successively The chemical pretreatment system that connects, membrane filtration system 5, electrodialysis system 6, desulfurization wastewater pre-heating system, desulfurization wastewater evaporator 10, Equipment for separating liquid from solid 11 and vapour condensation device.
Chemical pretreatment system, including buffer pool 1, Softening box 2, filter press 3 and adjuster 4, the connection of 1 outlet end of buffer pool To Softening box 2,2 outlet end of Softening box is connected to filter press 3 and adjuster 4, and 4 outlet end of adjuster is connected to membrane filtration system 5.
Membrane filtration system 5 uses micro-filtration, and outlet end is connected to electrodialysis system 6.
Treated that desulfurization wastewater is first delivered to through waste water pump 8 after 7 degassing process of vacuum degassing machine again for electrodialysis system 6 Preheater 9.
Desulfurization wastewater pre-heating system main device is preheater 9, is equipped with superheated steam and introduces pipe and fairlead, superheated steam It is introduced into the inlet header that pipe is connected to Late reworking 15 in ultra supercritical CFB boiler 14, superheated steam fairlead is connected to super The steam sootblower arranged in air preheater 16 in Supercritical CFB Boiler 14.9 outlet end of preheater is connected to desulfurization wastewater evaporator 10。
Desulfurization wastewater evaporator 10 is equipped with high-temperature flue gas and introduces pipe and high-temperature flue gas fairlead, and high-temperature flue gas introduces pipe connection It is connected to ultra supercritical CFB boiler to 17 outlet port of cyclone separator, high-temperature flue gas fairlead in ultra supercritical CFB boiler 14 14 back-end ductwork.The salt pulp liquor that desulfurization wastewater evaporator 10 generates is directed to equipment for separating liquid from solid 11, the secondary steaming of generation Vapour is sent to condenser 12.
Equipment for separating liquid from solid 11 includes centrifuge and drying machine.The drain pipe of equipment for separating liquid from solid 11 is connected to desulfurization wastewater The waste water saline solution isolated is sent to desulfurization wastewater evaporator 10 and continues to evaporate by evaporator 10.
Vapour condensation device includes condenser 12 and reuse pool 13, and 12 arrival end of condenser connects desulfurization wastewater evaporator The condensation-water drain end of 10 steam fairlead, condenser 12 connects reuse pool 13.
Using the zero emission treatment of desulfured waste water of above system, include the following steps:
(1) desulfurization wastewater after lime stone-gypsum wet flue gas desulfurizing enters buffer pool 1, carries out Air Exposure, Even water quality;Desulfurization wastewater enters Softening box 2 later, and NaOH solution, Na are added into case2CO3Solution and organic sulfur (TMT-15) Composite reagent removes the heavy metal ion such as Pb in waste water3+、Fe3+、Cr3+、Cd2+、Ni+、Hg2+、Pb2+、Cu2+, while generating phase It should precipitate, adjust pH value to 10.0 or so.Softening box is additionally provided with electric mixing device simultaneously, is convenient for the composite reagent of input and takes off Sulphur waste water is thoroughly chemically reacted.What is generated in Softening box contains heavy metal element precipitation, other indissolubles precipitation and suspended matter Equal sludge are sent to after filter press 3 carries out press filtration and are discharged.The softened case 2 of desulfurization wastewater enters adjuster 4 after handling, and passes through addition PH value is adjusted to 6~8 by hydrochloric acid solution.
(2) waste water of adjuster 4 enters membrane filtration system 5 and is filtered processing, removes suspended matter, height in desulfurization wastewater Molecular organic, colloid, particle reduce the pollution index of desulfurization wastewater.Preprocessed system treated desulfurization waste water quality Index is effectively controlled, and heavy metal element, inorganic salts, fouling tendency ion etc. are completely removed, and waste water hardness is removed, It can avoid the generation of equipment corrosion and fouling.
(3) treated that waste water is sent to electrodialysis system 6 for membrane filtration system 5, and concentration works are reduced compared to others Skill power consumption and medicament network minimal, thus can effectively controlled investment cost increase economic efficiency.Make desulfurization wastewater in electric field masterpiece With lower respectively by cation-exchange membrane and anion-exchange membrane to carry out the desalination and concentration of desulfurization wastewater respectively, convenient for dividing From with purify and concentrate decrement desulfurization wastewater.The fresh water of generation, which directly recycles, is used for boiler of power plant make-up water, the concentrated water of generation It then send and removes incoagulable gas in desulfurization wastewater to vacuum degassing machine 7 and boiling point is less than the volatile components of water, it is de- through vacuum Desulfurization wastewater after 7 degassing process of mechanism of qi is sent to waste water pump 8, and desulfurization wastewater is sent to preheater 9 and preheated by waste water pump 8.
(4) desulfurization wastewater is sent to preheater 9 by waste water pump 8, and the heat source for preheating is ultra supercritical CFB boiler 14 Superheated steam at 15 inlet header of middle Late reworking after superheated steam is used to preheat desulfurization wastewater, then passes through superheated steam Fairlead leads to the steam sootblower arranged in air preheater and carries out air preheater soot blowing, and it is useless that the desulfurization wastewater after preheating is sent to desulfurization Water evaporimeter 10.
(5) enter the desulfurization wastewater of desulfurization wastewater evaporator 10 by the cyclone separator in ultra supercritical CFB boiler 14 The high-temperature flue gas heating evaporation of 17 outlets heats the high-temperature flue gas after desulfurization wastewater and leads to super face by high-temperature flue gas fairlead CFB boiler 14 back-end ductwork in boundary's continues to participate in flue gas flow.Treated that desulfurization wastewater dope is sent for desulfurization wastewater evaporator 10 To equipment for separating liquid from solid 11, the indirect steam of generation is sent to vapour condensation device.
(6) the dense salt slurries that desulfurization wastewater is formed after 10 evaporation process of desulfurization wastewater evaporator enter equipment for separating liquid from solid 11 are separated by solid-liquid separation, and solid crystal salt is obtained after centrifuge and drying machine processing, and it is additional to can be used as Nacl sale creation Economic well-being of workers and staff, the wastewater mother liquor isolated introduces desulfurization wastewater evaporator 10 and evaporated again.Desulfurization wastewater evaporator 10 The indirect steam of generation is sent to the condenser 12 in vapour condensation device, and the condensed water for condensing formation enters reuse pool 13, The recyclable steam for boiler of power plant make-up water supplementary thermal system loses, and realizes the recycling and zero-emission of desulfurization wastewater Processing.
Further, the wastewater mother liquor being separated by solid-liquid separation is sent to continuing to evaporate in desulfurization wastewater evaporator 10, concentrates salt Liquid promotes purity.
Further, the vacuum degassing machine 7 being equipped with after electrodialysis system 6 can remove incoagulable gas in desulfurization wastewater and Boiling point is less than the volatile components of water.
Preferably, the heat source of preheater 9 is using the mistake at 15 inlet header of Late reworking in ultra supercritical CFB boiler 14 Hot steam, superheated steam is generally used for air preheater soot blowing at this, but because after soot blowing steam temperature can rise therefore need to increase desuperheating water Amount.After first being used for superheated steam herein to preheat desulfurization wastewater, then leads to the steam sootblower arranged in air preheater 16 and carry out Air preheater soot blowing will be such that steam temperature no longer increases and save spray water flux, economy of power plant benefit can be improved.
Preferably, the heat source of desulfurization wastewater evaporator 10 is that cyclone separator 17 exports position in ultra supercritical CFB boiler 14 The high-temperature flue gas set can efficiently use flue gas heat, thermal energy is avoided to waste, greatly improve heat transfer temperature difference, greatly reduce energy consumption And the heat exchange efficiency of evaporator is improved, energy saving and operating cost reduces equipment investment expense.Heat the height after desulfurization wastewater Warm flue gas is sent to 14 back-end ductwork of ultra supercritical CFB boiler by high-temperature flue gas fairlead and continues to participate in flue gas flow.
The present invention using the high-temperature flue gas of ultra supercritical CFB boiler Cyclone outlet position as heat source to desulfurization wastewater into Row evaporative crystallization, using the superheated steam at ultra supercritical CFB boiler Late reworking inlet header as preheating desulfurization wastewater Heat source, and the membrane filtration system for possessing micro-filtration and the electrodialysis system for concentrating decrement are added, overcome existing multiple-effect The defect that energy consumption existing for evaporation technique is big, equipment investment is costly can improve desulfuration efficiency, effectively avoid equipment scaling, subtract Few system processing load significantly improves economic benefit, energy saving and operating cost.And ultra supercritical CFB boiler uses wet method It is more excellent that by-product gypsum impurity content after flue gas desulfurization lacks quality, and application value height can be that power plant bring more considerable receipts Entering, the water quality reaching standard of desulfurization wastewater after processing is recycled by power plant, and the solid crystal salt of generation can be used as Nacl sale, It realizes ultra supercritical CFB boiler desulfurization wastewater zero-emission, is conducive to energy conservation and environmental protection and sustainable development.
It should be noted that above-described embodiment is only the preferable embodiment of the present invention, but the present invention is not by above-mentioned implementation Example limitation, it is all under the principle and spirit of the invention essence to any simple modification made by above example, combination, equivalent replace It changes, change, simplify, should be included within the scope of the present invention.

Claims (10)

1. a kind of ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system, which is characterized in that including the chemistry set gradually Pretreatment system, electrodialysis system (6), desulfurization wastewater pre-heating system, desulfurization wastewater evaporator (10), is consolidated membrane filtration system (5) Liquid separating apparatus (11) and vapour condensation device;
The chemical pretreatment system includes buffer pool (1), Softening box (2), filter press (3) and adjuster (4), buffer pool (1), Softening box (2) and adjuster (4) are sequentially connected, and Softening box (2) send sludge to filter press (3), the outlet of filter press (3) End discharge sludge;Adjuster (4) is connected with membrane filtration system (5);
The electrodialysis system (6) will treated desulfurization wastewater first after vacuum degassing machine (7) degassing process again through waste water Pump (8) is delivered to desulfurization wastewater pre-heating system;
The desulfurization wastewater pre-heating system includes preheater (9), and preheater (9) is connected with desulfurization wastewater evaporator (10);
The salt pulp liquor that the desulfurization wastewater evaporator (10) generates is directed to equipment for separating liquid from solid (11), the secondary steaming of generation Vapour is sent to vapour condensation device;
The vapour condensation device includes condenser (12) and reuse pool (13), and it is useless that condenser (12) arrival end connects desulfurization The steam fairlead of water evaporimeter (10), the condensation-water drain end connection reuse pool (13) of condenser (12).
2. ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system according to claim 1, which is characterized in that institute The Softening box (2) stated is equipped with electric mixing device, and composite reagent and desulfurization wastewater for input are chemically reacted.
3. ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system according to claim 1, which is characterized in that institute The membrane filtration system (5) stated uses micro-filtration.
4. ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system according to claim 1, which is characterized in that institute The preheater (9) stated is equipped with superheated steam and introduces pipe and fairlead, and superheated steam introduces pipe connection ultra supercritical CFB boiler (14) Middle Late reworking (15) inlet header, superheated steam fairlead connect in ultra supercritical CFB boiler (14) in air preheater (16) The steam sootblower of arrangement.
5. ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system according to claim 1, which is characterized in that institute The desulfurization wastewater evaporator (10) stated is equipped with high-temperature flue gas and introduces pipe and high-temperature flue gas fairlead, desulfurization wastewater evaporator (10) High-temperature flue gas is introduced into the high-temperature flue gas discharge of cyclone separator (17) outlet port in pipe connection ultra supercritical CFB boiler (14) Pipe, high-temperature flue gas fairlead are connected to ultra supercritical CFB boiler (14) back-end ductwork.
6. ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system according to claim 1, which is characterized in that institute The equipment for separating liquid from solid (11) stated includes centrifuge and drying machine.
7. ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system according to claim 1, which is characterized in that institute The equipment for separating liquid from solid (11) stated is equipped with a wastewater mother liquor fairlead and connects desulfurization wastewater evaporator (10).
8. using the place of the ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system described in claim 1~7 any one Reason method, which is characterized in that include the following steps:
1) desulfurization wastewater after lime stone-gypsum wet flue gas desulfurizing enters buffer pool (1), carries out Air Exposure, uniform water Matter;Desulfurization wastewater enters Softening box (2) later, and NaOH solution, Na are added into case2CO3The composite reagent of solution and organic sulfur, The heavy metal ion in waste water is removed, while generating corresponding precipitation, adjusts pH value to 9~11;The sludge generated in Softening box (2) It is sent to after filter press (3) carries out press filtration and is discharged;Enter adjuster (4) after the softened case of desulfurization wastewater (2) processing, passes through addition PH value is adjusted to 6~8 by hydrochloric acid solution;
2) waste water of adjuster (4) enters membrane filtration system (5) and is filtered processing, reduces the pollution index of desulfurization wastewater;
3) treated that waste water is sent to electrodialysis system (6) for membrane filtration system (5), makes desulfurization wastewater under electric field force effect point Not by cation-exchange membrane and anion-exchange membrane to carry out the desalination and concentration of desulfurization wastewater respectively, the fresh water of generation is straight It takes back receipts and is used for boiler of power plant make-up water, the concentrated water of generation then send to vacuum degassing machine (7) incoagulability removed in desulfurization wastewater Gas and boiling point are less than the volatile components of water, and the desulfurization wastewater after vacuum degassing machine (7) degassing process is sent to waste water pump (8), desulfurization wastewater is sent to preheater (9) and is preheated by waste water pump (8);
4) desulfurization wastewater is sent to preheater (9) by waste water pump (8), and the desulfurization wastewater after preheating is sent to desulfurization wastewater evaporation Device (10);
5) enter the desulfurization wastewater of desulfurization wastewater evaporator (10) by heating evaporation, that treated is de- for desulfurization wastewater evaporator (10) Sulphur waste water dope is sent to equipment for separating liquid from solid (11), and the indirect steam of generation is sent to vapour condensation device;
6) the dense salt slurries that desulfurization wastewater is formed after desulfurization wastewater evaporator (10) evaporation process enter equipment for separating liquid from solid (11) it is separated by solid-liquid separation, obtains solid crystal salt after centrifuge and drying machine processing, the wastewater mother liquor isolated introduces de- Sulphur waste water evaporator (10) is evaporated again;The indirect steam that desulfurization wastewater evaporator (10) generates is sent to steam condensation dress Condenser (12) in setting, the condensed water for condensing formation enter reuse pool (13).
9. special using the processing method of ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system according to any one of claims 8 Sign is that step 6), which is separated by solid-liquid separation obtained wastewater mother liquor and send to desulfurization wastewater evaporator (10) is interior, to be continued to evaporate;Electrodialysis system System (6) vacuum degassing machine (7) for being equipped with afterwards is used to remove incoagulable gas in desulfurization wastewater and boiling point is volatile less than water Component.
10. using the processing method of ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system according to any one of claims 8, It is characterized in that, the heat source of preheater (9) is using the mistake at Late reworking (15) inlet header in ultra supercritical CFB boiler (14) Hot steam;After superheated steam is used to preheat desulfurization wastewater, then leads to the steam sootblower arranged in air preheater (16) and carry out sky in advance Device soot blowing;
The heat source of desulfurization wastewater evaporator (10) is the height of cyclone separator (17) outlet port in ultra supercritical CFB boiler (14) Warm flue gas;High-temperature flue gas after heating desulfurization wastewater is sent by high-temperature flue gas fairlead to ultra supercritical CFB boiler (14) tail portion Flue continues to participate in flue gas flow.
CN201810651108.5A 2018-06-22 2018-06-22 A kind of ultra supercritical CFB boiler desulfurization wastewater zero-discharge treatment system and method Pending CN108558110A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109851129A (en) * 2019-02-03 2019-06-07 中国原子能科学研究院 For separating the separation equipment of polymorphic phase mixture

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109851129A (en) * 2019-02-03 2019-06-07 中国原子能科学研究院 For separating the separation equipment of polymorphic phase mixture

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