CN208732818U - A kind of Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment system - Google Patents
A kind of Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment system Download PDFInfo
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- CN208732818U CN208732818U CN201721901115.3U CN201721901115U CN208732818U CN 208732818 U CN208732818 U CN 208732818U CN 201721901115 U CN201721901115 U CN 201721901115U CN 208732818 U CN208732818 U CN 208732818U
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Abstract
A kind of Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment system, the processing system is mainly made of lime clarifying basin, sodium carbonate clarifying basin, electrodialysis system, reverse osmosis unit and spray drying tower, pass through the electrodialysis system behind the Dual alkali softening sewage pretreatment device that lime clarifying basin, sodium carbonate clarifying basin are constituted, spray drying tower is connected by waste water pump behind electrodialysis system, the top gas outlet of spray drying tower connects fume afterheat exchanger, after a deduster, desulfurizing tower is connected through air-introduced machine；Its processing method is: after lime clarifying basin and the clarification tank depth pretreatment of sodium carbonate clarifying basin two-stage, again after electrodialysis system concentration, waste water enters spray drying tower through waste water pump, enter smoke gas afterheat heat exchanger after the atomization of high-speed rotating atomizer is fine drop group and flue gas carries out sufficient heat exchange, using fume afterheat wink-dry desulfurization wastewater, the discharge outlet discharge from spray drying tower bottom such as most of solid matter of generation is evaporated.
Description
Technical field
The utility model relates to a kind of Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment systems, belong at power-plant waste
Manage technical field.
Background technique
China is the country of a drought and water shortage, and water resource is relatively deficient.The shortage of water resource have become restriction country and
The serious problems of local economic development.Only Comprehensive utilizes the effective way for being only solution water shortage and blowdown environmental pollution
Diameter.With water resource growing tension and environmental requirement it is increasingly stringent, coal-burning power plant it is water-saving subtract it is dirty imperative.Country is right
The environment that thermal power plant generates influences requirement, and more stringent requirements are proposed: " realizing full factory waste water zero discharge ".Coal-burning power plant is useless
Water recycling substantially after full factory's water affairs management, by finally can not reuse to other systems industrial wastewater be used as desulfurization use
Water, so desulfurization wastewater processing is the key that full factory's zero-emission.The desulfurization wastewater zero-emission of coal-burning power plant can be maximum
Wastewater disposition is reduced, there is good environmental benefit and social benefit.
The coal-burning power plant of desulfurizing fly ash is completed mainly using lime stone-gypsum wet flue gas desulfurizing technique at present.
Lime stone-gypsum wet sulfur removal technology generallys use lime stone as desulfurization absorbent, will mix after limestone crushing with water,
It is levigate to become powdery, absorption slurries are made.It absorbs slurries and is sent to desulfurizing tower as loop slurry, loop slurry is by nozzle from upper
And lower spray, it is contacted with the flue gas adverse current flowed from bottom to top, the sulfur dioxide in flue gas is rapidly absorbed into slurry pool and lime
Stone, air oxidation, which react, generates gypsum, and sulfur dioxide is removed, and gypsum is transported through dehydration.
Desulphurization circulating slurries cause chlorine ion concentration continuous due to constantly absorbing the chloride in flue gas and lime stone
Increase, increasing for concentration can bring many adverse effects, such as inhibit the dissolution of lime stone, reduce the pH value of slurries, influence
The assimilation effect of sulfur dioxide, makes CaSO4It is easy to fouling, and accelerates the corrosion etc. of metal material.In addition, chlorine ion concentration is excessively high
Also it will affect the quality of desulfurizing byproduct gypsum.For the normal operation for guaranteeing desulphurization system, should generally control in absorption tower chlorine from
Sub- content is lower than 20000mg/L.In addition, dust also can constantly accumulate in loop slurry, desulphurization system as chloride ion
Fine dust carried in flue gas dust, the inert substance in lime stone, dormant small gypsum crystal and
Impurity etc. in process water.For the purity and the normal physicochemical properties of system slurry for guaranteeing commercial gypsum, need to system
Interior fine dust concentration is controlled.
Therefore, in order to guarantee the normal operation of desulphurization system and the quality of desulfurizing byproduct gypsum, it is necessary to discharge a certain amount of
Desulfurization wastewater.The waste water of desulphurization system discharge is generally from lower unit: overflow water, the waste-water vortex of gypsum hydrocyclone
Overflow water, filtrate of vacuum belt filter of device etc..Desulfurization wastewater is generally weakly acidic, coal-burning power plant's wet desulphurization waste water
Typical water quality see the table below.
Coal-burning power plant's wet desulphurization waste water typical case's water quality
| Project | Unit | Data | Project | Unit | Data |
| pH | 4.0-6.0 | Fe2+ | mg/L | ≤30 | |
| SS | mg/L | 20000-50000 | Al3+ | mg/L | ≤50 |
| F- | mg/L | 20-40 | Mn2+ | mg/L | ≤30 |
| Cl- | mg/L | 1000-20000 | Cr2+ | mg/L | ≤5 |
| SO4 2- | mg/L | 2000-5000 | Ni2+ | mg/L | ≤2 |
| SO3 2- | mg/L | 0-200 | Zn2+ | mg/L | 5-25 |
| S2O6 2- | mg/L | 500-1000 | Cd2+ | mg/L | 0.5-25 |
| NO3- | mg/L | 100-200 | Cu2+ | mg/L | 5-23 |
| Ca2+ | mg/L | 500-5000 | Pb2+ | mg/L | 3-15 |
| Mg2+ | mg/L | 500-5000 | Hg2+ | mg/L | 0.2-5 |
| COD(Cr) | mg/L | ≤200 | V | mg/L | ≤2 |
Remarks: desulfurization wastewater water, water quality are by the water quality impact of coal quality and desulphurization system process water, substantially a factory
One water, water quality, water quality and water are unstable, and the above is only typical datas.
For the water quality characteristics of desulfurization wastewater, desulfurization wastewater conventional treatment is generally using neutralization, flocculation, precipitating and mistake at present
The treatment process such as filter, according to desulfurization waste water quality feature, power industry has formulated that " thermal power plant's lime stone-gypsum wet desulfurization is useless
Water Water Quality Control Indexes " (DL/T 997-2006), the index define desulfurization wastewater treatment system outlet monitoring project and dirt
Contaminating object highest allows concentration of emission, becomes and instructs the processed conventionally main criteria of power plant desulfurization wastewater.It is conventional pretreated de-
Sulphur waste water discharge of major pollutant index should meet: pH:6~9；Ss suspended solid≤70mg/L；COD(Cr)≤150mg/L；Sulfuric acid
Radical ion≤3000mg/L.In addition to this, desulfurization wastewater salt content (TDS) is generally 25,000~35,000mg/L, wherein chlorine
Ion > 10000mg/L, calcium+magnesium ion > 3000mg/L and according to coal quality fluctuate it is larger.
We are illustrated with Zhejiang Desulphurization for Coal-fired Power Plant waste water system.
2x300MW generator set desulfurization waste water actual amount of water in Zhejiang coal-burning power plant is about 15m3/ h, field measurement water sample water quality
It is as follows:
Since the wastewater zero discharge project to have put into operation at present is seen, project cost height and operating cost height are two most outstanding
Problem, this just needs to find more preferably method for treating desulfurized wastewater from improving heat utilization ratio and reducing the angle of cost.
Summary of the invention
The purpose of the utility model is to overcome the shortcomings of the prior art, and provide one kind and combine film concentration and side
Road flue spray drying technology, is able to achieve wastewater zero discharge, and the coal-burning power plant for having reached reduction investment and operating cost purpose is de-
Sulphur Wastewater zero-discharge treatment system and method.
The purpose of this utility model is completed by following technical solution, a kind of Desulphurization for Coal-fired Power Plant wastewater zero discharge
Processing system, it is mainly by lime clarifying basin, sodium carbonate clarifying basin, electrodialysis system, reverse osmosis unit and spray drying tower group
At by Dual alkali sofening treatment dress behind the waste gas pre-treating device that the lime clarifying basin, sodium carbonate clarifying basin are constituted
It sets and connects the electrodialysis system, spray drying tower is connected by waste water pump behind the electrodialysis system, it is described spraying dry
The top gas outlet connection fume afterheat exchanger of dry tower connects desulfurizing tower through air-introduced machine after a deduster.
As preferred: the bottom of the spray drying tower passes through storehouse pump one Solid state fermentation system of connection；The electric osmose
Also connect reverse osmosis unit all the way on analysis system, and the Dual alkali sofening treatment device described by reverse osmosis unit connection, in institute
It states and also mating before electrodialysis system an electrodialysis feed pump is installed；A waste water tank is connected to behind the electrodialysis system,
The wastewater outlet of the waste water tank first connects a high-order feed box, the high position feed box being sprayed described in connection by a waste water pump
Drying tower.
It is a kind of to carry out Desulphurization for Coal-fired Power Plant wastewater zero discharge using the Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment system
Processing method, this method are then the electrodialysis after lime clarifying basin and the clarification tank depth pretreatment of sodium carbonate clarifying basin two-stage
After system concentration, waste water enters spray drying tower through waste water pump, after the atomization of high-speed rotating atomizer is fine drop group
Sufficient heat exchange is carried out into smoke gas afterheat heat exchanger and flue gas, using fume afterheat wink-dry desulfurization wastewater, evaporation is produced
The discharge outlet discharge from spray drying tower bottom such as raw most of solid matter；Tail gas after spray-dried tower is dry returns
The import of electric precipitator enters desulfurizing tower after air-introduced machine.
The utility model is using lime clarifying basin → sodium carbonate clarifying basin → electrodialysis → bypass flue spray drying work
The advantages of skill route, the program are as follows: technique of the electrodialysis as enriching stage, investment and operating cost all relatively economicals；It examines
Consider and Waste water concentrating to about 20% is used into high-temperature flue gas desiccation again, operating cost can be reduced；Bypass flue process system heat benefit
High with rate, heat loss is small.
Detailed description of the invention
Fig. 1 is the flow diagram of desulfurization wastewater zero-discharge treatment system described in the utility model.
Specific embodiment
Detailed introduction is done to the utility model below in conjunction with attached drawing: shown in Fig. 1, a kind of combustion described in the utility model
Coal-fired plant's desulfurization wastewater zero-discharge treatment system, it is mainly by lime clarifying basin, sodium carbonate clarifying basin, electrodialysis system 4, reverse osmosis
Saturating device 5 and spray drying tower 9 form, the waste gas pre-treating device 1 that the lime clarifying basin, sodium carbonate clarifying basin are constituted
The electrodialysis system 4 is connected by Dual alkali sofening treatment device 2 below, passes through waste water behind the electrodialysis system 4
7 connection spray drying tower 9 of pump, the top gas outlet of the spray drying tower 9 connects fume afterheat exchanger 12, removes by one
After dirt device 13, desulfurizing tower 15 is connected through air-introduced machine 14, exhaust gas after processing is discharged through chimney 16.
As shown in the figure, the bottom of the spray drying tower 9 passes through 10 one Solid state fermentation system 11 of connection of storehouse pump；Described
Also connect reverse osmosis unit 5 all the way on electrodialysis system 4, and connects the Dual alkali sofening treatment by reverse osmosis unit 5 and fill
2 are set, it is also mating before the electrodialysis system 4 that an electrodialysis feed pump 3 is installed；Connect behind the electrodialysis system 4
There is a waste water tank 6, the wastewater outlet of the waste water tank 6 first connects a high-order feed box 8, the high position feed box 8 by a waste water pump 7
Reconnect the spray drying tower 9.
It is a kind of to carry out Desulphurization for Coal-fired Power Plant wastewater zero discharge using the Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment system
Processing method, which is: after lime clarifying basin and the clarification tank depth pretreatment of sodium carbonate clarifying basin two-stage, then electricity
After electrodialysis system concentration, waste water enters spray drying tower through waste water pump, is fine drop by the atomization of high-speed rotating atomizer
Enter smoke gas afterheat heat exchanger after group and flue gas carries out sufficient heat exchange, using fume afterheat wink-dry desulfurization wastewater, steams
Send out the discharge outlet discharge from spray drying tower bottom such as most of solid matter generated；Tail gas after spray-dried tower is dry
The import for returning to electric precipitator enters desulfurizing tower after air-introduced machine.
Embodiment: a kind of Desulphurization for Coal-fired Power Plant wastewater treatment method, it mainly by lime clarifying basin, sodium carbonate clarifying basin,
Electrodialysis system, counter-infiltration system and spray drying tower composition.Waste water raw water water 15t/h, after depth pretreatment system,
It produces water and squeezes into electrodialysis system through filtering pump, and lime clarifying basin spoil disposal is sent through dehydration to grey factory or as fixed-end forces；
Sodium carbonate clarifying basin spoil disposal sends FGD lime stock tank back to and does slurries.Select electrodialysis by Waste water concentrating to 3t/h, two units are respectively set
The spray drying tower of a set of 3t/h, the using and the reserved.By taking 30MW unit as an example, the total flue gas of bypass flue gas Zhan needed for dry 3t waste water
Ratio about 3.5% is measured, it is smaller to be calculated influence to air preheater.Waste water enters drying tower through waste water pump after electrodialysis concentration, passes through
High-speed rotating atomizer atomization is crossed to carry out sufficient heat exchange with flue gas after fine drop group, is done using fume afterheat moment
Dry desulfurization wastewater evaporates the discharge outlet discharge from spray drying tower bottom such as most of solid matter of generation；It is spray-dried
Tail gas after tower is dry returns to electric precipitation import.The water outlet of electrodialysis fresh water side returns to depth pretreatment system reuse.This technique cigarette
The object that is evaporated after the dry waste water of gas is finally mixed into flyash.
Desulfurization wastewater is after pretreatment, at the two-stage coagulation clarification softening by lime clarifying basin and sodium carbonate clarifying basin
Science and engineering skill removes solid suspension, heavy metal and Ca in water removal to greatest extent2+、Mg2+、SO4 2-、F-, the foulings factor such as silicon,
Electrodialysis plant is squeezed by pump after filtering.Strong brine after electrodialysis is concentrated enters bypass flue spraying system, fresh water
Side waste water is retracted into depth pretreatment system by reverse osmosis concentrated.Bypass flue is to export to draw hot fume from denitration by spraying, warp
Bypass flue is sent to spray drying tower；Desulfurization wastewater enters drying tower by the road, is thin by the atomization of high-speed rotating atomizer
Sufficient heat exchange, which is carried out, with flue gas after droplet group evaporates the big portion of generation using fume afterheat wink-dry desulfurization wastewater
Divide the discharge outlet discharge from spray drying tower bottom such as solid matter；Tail gas after spray-dried tower is dry return electric precipitation into
Mouthful.The object that is evaporated after flue gas drying waste water is finally mixed into flyash.
Claims (2)
1. a kind of Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment system, it is mainly by lime clarifying basin, sodium carbonate clarifying basin, electric osmose
Analysis system, reverse osmosis unit and spray drying tower composition, it is characterised in that the lime clarifying basin, sodium carbonate clarifying basin are constituted
Dual alkali softening sewage pretreatment device behind pass through the electrodialysis system, pass through waste water behind the electrodialysis system
Pump connection spray drying tower, the top gas outlet of the spray drying tower connect fume afterheat exchanger, are passing through a deduster
Afterwards, desulfurizing tower is connected through air-introduced machine.
2. Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment system according to claim 1, it is characterised in that described spraying dry
The bottom of dry tower passes through storehouse pump one Solid state fermentation system of connection；Also connect reverse osmosis dress all the way on the electrodialysis system
It sets, and the Dual alkali sofening treatment device described by reverse osmosis unit connection, it is also mating before the electrodialysis system to be equipped with
One electrodialysis feed pump；A waste water tank is connected to behind the electrodialysis system, the wastewater outlet of the waste water tank is useless by one
Water pump first connects a high-order feed box, which reconnects the spray drying tower.
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| CN201721901115.3U CN208732818U (en) | 2017-12-29 | 2017-12-29 | A kind of Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107892427A (en) * | 2017-12-29 | 2018-04-10 | 中国能源建设集团浙江省电力设计院有限公司 | A kind of Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment system and method |
| CN111437701A (en) * | 2020-05-08 | 2020-07-24 | 浙江浙能技术研究院有限公司 | System and method for balancing and treating materials in slurry of limestone wet desulphurization absorption tower |
-
2017
- 2017-12-29 CN CN201721901115.3U patent/CN208732818U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107892427A (en) * | 2017-12-29 | 2018-04-10 | 中国能源建设集团浙江省电力设计院有限公司 | A kind of Desulphurization for Coal-fired Power Plant Wastewater zero-discharge treatment system and method |
| CN111437701A (en) * | 2020-05-08 | 2020-07-24 | 浙江浙能技术研究院有限公司 | System and method for balancing and treating materials in slurry of limestone wet desulphurization absorption tower |
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