CN108083370A - The flue vapo(u)rization system and method for evaporating of desulfurization wastewater - Google Patents
The flue vapo(u)rization system and method for evaporating of desulfurization wastewater Download PDFInfo
- Publication number
- CN108083370A CN108083370A CN201711487492.1A CN201711487492A CN108083370A CN 108083370 A CN108083370 A CN 108083370A CN 201711487492 A CN201711487492 A CN 201711487492A CN 108083370 A CN108083370 A CN 108083370A
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- China
- Prior art keywords
- flue
- waste water
- water
- desulfurization wastewater
- temperature
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- 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
- C02F1/12—Spray evaporation
-
- 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
- C02F1/16—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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/101—Sulfur compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
Abstract
The flue vapo(u)rization system of the desulfurization wastewater of the present invention, it is characterised in that：The smoke outlet of boiler connects the smoke inlet of desulfurizing tower by bag filter, the water inlet of the wastewater outlet connection filtrate box of desulfurizing tower, water inlet of the water outlet of filtrate box through waste water pump connection atomizer, the atomizing nozzle of atomizer connect the high-temperature flue before bag filter entrance.The invention has the advantages that（1）Waste water reclaiming reduces industrial water total amount.By sewage reuse to greatest extent, water resource is saved, alleviates the predicament of water resource critical shortage.（2）High poison, hard-degraded substance can be cured, solve sewage disposal problem.（3）It can realize the zero-emission of whole industrial wastewaters, it will what is brought is that being greatly decreased of water demand amount, a large amount of of carrying capacity of environment are reduced and living environment is greatly improved.
Description
Technical field
The present invention relates to Wet Flue Gas Desulfurization Technique fields, the specially a kind of flue vapo(u)rization system of desulfurization wastewater and evaporation side
Method.
Background technology
Wet desulfurization system must regular waste discharge because FGD systems are to Cl-Concentration is restrictive；Due to Cl-With
The increase of system operation time, concentration can be higher and higher, and with the Ca in solution+Ions binding forms CaCl2Solution, this meeting
Inhibit the dissolving of lime stone, reduce liquid phase and obtain basicity.So or reduce desulfuration efficiency or be to maintain identical desulfurization
In the case of efficiency, the utilization rate of desulfurizing agent is reduced, while increases the corrosion rate of material.And lime stone desulfurization of gypsum system
The by-product of generation --- gypsum, the gypsum of commerical grade is to Cl-The concentration of ion has maximum requirement, gypsum maximum Cl-Allow to contain
Amount is required less than 120mg/kg mostly, it is necessary to be obtained by discharge unit waste water or flushing gypsum filter cake, general FGD systems are comprehensive
Conjunction employs both approaches.The processing mode species of China's power plant desulfurization wastewater is various, greatly to being divided into two kinds：
1st, the desulfurization wastewater of high concentration is sprayed into clinker, by the heavy metal and salt in clinker Absorption Desulfurization waste water, reaches reduction
The purpose of the concentration of heavy metal and villaumite in solution puts into practice conclusion and teaches that the method has the effect of certain really, but heavy
Metal, chloride content are still very high, again during this solution of reuse, the spray head of spray equipment are usually caused to block（Salt content is too
Height, evaporative crystallization cause very much blocking soon）.
The desulfurization wastewater of 2 high concentrations, by base extraction（2 alkaline solutions of such as Ca (OH) make plurality of heavy metal generate salt
Then precipitate, achieve the purpose that heavy-metal ion removal, the solution of removing heavy metals is gone to add in suitable hydrochloric acid（HCl solution) is adjusted
PH value, make pH value between 6 ~ 9, treated solution is through film process（Infiltration）Discharge or recycle-water, what film process generated
Waste water does precipitation flocculation treatment.
Both approaches cannot all reach preferable effect.
The content of the invention
In order to compensate for the shortcomings of the prior art, the present invention provides a kind of desulfurization wastewaters simple in structure, easy to use
Flue vapo(u)rization system and method for evaporating.
The present invention is achieved through the following technical solutions：
The flue vapo(u)rization system of the desulfurization wastewater of the present invention, it is characterised in that：The smoke outlet of boiler is connected by bag filter
The smoke inlet of desulfurizing tower, the water inlet of the wastewater outlet connection filtrate box of desulfurizing tower, the water outlet of filtrate box connect through waste water pump
The water inlet of atomizer is connect, the atomizing nozzle of atomizer connects the high-temperature flue before bag filter entrance.
Atomizer includes fluid line, and the beginning of fluid line is sequentially installed with the small flange of import, flow control valve, flow
Meter and mounting flange, the end of fluid line are equipped with several atomizers, and each atomizer connects a pressure gauge.
Insulating layer is enclosed on the outside of the fluid line of atomizer, insulating layer plays heat-insulated work between runner and high-temperature flue gas
With.
The flue method of evaporating that the flue vapo(u)rization system of the desulfurization wastewater of the present invention carries out, waste water are pumped into mist by waste water
Change in device, be atomized desulfurization wastewater using gas-liquid two-phase flow nozzle, before the waste water by atomization enters bag filter entrance
High-temperature flue, flue-gas temperature at this time, using smoke temperature by the moisture evaporating completely in flue gas, make in waste water at 130 DEG C ~ 150 DEG C
Pollutant be converted into crystal or salt, solid therein again by entering under the graviational interaction of air-introduced machine in deduster, with
The flue dust of flue gas is captured together by deduster, so as to fulfill the environmental protection effect of wastewater zero discharge.
The desulfurization wastewater of 300MW units is only 5 cubic metres/h, and desulfurization wastewater water temperature is 50 DEG C ~ 55 DEG C, front flue of dust collector
Temperature is 140 DEG C ~ 155 DEG C, is evaporated in the desulfurization wastewater that flue is sprayed into after atomization in flue rapidly, and it is only 5 ~ 10 that smoke temperature, which declines,
DEG C, flue-gas temperature is higher than acid dew point, will not generate corrosion to front flue of dust collector and body of deduster, and physical property to ash and
Comprehensive utilization will not have an impact；Metallics in desulfurization wastewater enters with grey in duster system, due to metallics
Content account for dust content 0.01%, filter bag will not be had an impact.
Desulfurization wastewater refers mainly to the waste water in knockout drum underflow during de- gypsum, i.e., small unit waste water, in waste water tank
Liquid, i.e. large-sized unit waste water, the main component in waste water are：CaCO3, MgCO3, CaF2, flying dust, in waste water solid matter account for 3 ~
4%, wherein CaSO4.2H2O accounts for 0.6 ~ 0.7%, these substances are all inorganic salts, soluble easily in water, are not easy to form sediment.
The invention has the advantages that
（1）Waste water reclaiming reduces industrial water total amount.By sewage reuse to greatest extent, water resource is saved, it is tight to alleviate water resource
The predicament of weight shortage；
（2）High poison, hard-degraded substance can be cured, solve sewage disposal problem；
（3）It can realize the zero-emission of whole industrial wastewaters, it will what is brought is to being greatly decreased of water demand amount, environment
A large amount of reductions of load and being greatly improved for living environment；
（4）It realizes desulfurization wastewater zero-emission, alleviates the pressure of waste water from power plant;
（5）It, can all highly-saline waste water in treatment of Power from the influence of boiler load；；
（6）It is easy to be transformed on existing, improvement expenses is low;
（7）Absorption tower entrance flue gas temperature in wet desulfurization system is reduced, reduces in desulphurization system and evaporates water consume；
（8）Efficiency of dust collection raising makes the dust content into absorption tower largely reduce, and can be effectively improved quality of desulphurization gypsum, also subtract
The probability that few demister blocks；
（9）Atomizer is with efficient insulation layer, and insulating layer is between runner and high-temperature flue gas, due to the heat-insulated work of insulating layer
With the liquid in runner will not too early vaporize before being sprayed from nozzle, ensure that the liquid particles sprayed can be in flue gas
In be uniformly distributed.
Description of the drawings
Fig. 1 wet desulphurization sewage treatment technology process block diagrams, arrow are flue gas or the circulating direction of waste water.Fig. 2 is atomization
Device schematic diagram.
1 fluid line, the small flange of 2 imports, 3 flow control valves, 4 flowmeters, 5 mounting flanges, 6 atomizers, 7 pressure
Table.
Specific embodiment
Attached drawing is a kind of specific embodiment of the invention.
The flue vapo(u)rization system of the desulfurization wastewater of the present invention, the smoke outlet of boiler is by bag filter connection desulfurizing tower
Smoke inlet, the water inlet of the wastewater outlet connection filtrate box of desulfurizing tower, the water outlet of filtrate box connect atomizer through waste water pump
Water inlet, atomizer atomizing nozzle connection bag filter entrance before high-temperature flue.
Atomizer includes fluid line 1, the beginning of fluid line be sequentially installed with the small flange 2 of import, flow control valve 3,
Flowmeter 4 and mounting flange 5, the end of fluid line are equipped with several atomizers 6, and each atomizer connects a pressure
Power table 7.
Insulating layer is enclosed on the outside of the fluid line of atomizer, insulating layer plays heat-insulated work between runner and high-temperature flue gas
With.
Desulfurization wastewater is atomized using gas-liquid two-phase flow nozzle and is sprayed into the flue between air preheater and deduster,
Using fume afterheat by waste water evaporating completely, the pollutant in waste water is made to be converted into crystal or salt, with flying dust by except
Dirt device traps.
This set waste water treatment system is mainly for wastewater treatment after desulfurization by lime gypsum method, and waste water refers mainly in the system
Waste water during de- gypsum in knockout drum underflow（Small unit）, the liquid in waste water tank（Large-sized unit）, in waste water it is main into
It is divided into：CaCO3, MgCO3, CaF2, flying dust, solid matter accounts for 3 ~ 4% in waste water, and wherein CaSO4.2H2O accounts for 0.6 ~ 0.7%, this
A little substances are all inorganic salts, soluble easily in water, are not easy to form sediment.
Desulfurization wastewater processing step：Waste water is pumped by waste water conveying in atomizer, will using gas-liquid two-phase flow nozzle
Desulfurization wastewater is atomized, and the waste water by atomization enters the high-temperature flue before bag filter entrance, and flue-gas temperature at this time is 130
DEG C ~ 150 DEG C, using smoke temperature by the moisture evaporation in flue gas, the pollutant in waste water is made to be converted into crystal or salt, it is therein
Solid again by under the graviational interaction of air-introduced machine enter deduster in, is captured together by deduster with the dirt of flue gas, thus
Realize the environmental protection effect of wastewater zero discharge.
Desulfurization wastewater treating capacity is very low, and the desulfurization wastewater of 300MW units is only 5m3/h, and general desulfurization wastewater water temperature is 50
DEG C ~ 55 DEG C, front flue of dust collector temperature is 140 DEG C ~ 155 DEG C, can be rapidly in flue in the desulfurization wastewater that flue is sprayed into after atomization
Interior evaporation, it is only 5 ~ 10 DEG C that smoke temperature, which declines, and flue-gas temperature is higher than acid dew point, and front flue of dust collector and body of deduster will not be produced
Raw corrosion, and the physical property and comprehensive utilization of ash will not be had an impact.Metallics in desulfurization wastewater is removed as ash enters
In dirt device system, since the content of metallics accounts for dust content 0.01%, filter bag will not be had an impact.
The using effect of this method is,
1st, by introducing flue vapo(u)rization system, the high salinity wastewater solid in desulfurization wastewater is made；
2nd, traditional desulfurization wastewater treatment system energy consumption is reduced；
3rd, discharge the wet part of flue gas since flue gas after desulfurization water content is greatly reduced, after desulfurization to decline, plume rise height rise has
It is spread beneficial to pollutant, chimney periphery " gypsum rain " phenomenon can be mitigated or eliminated.
Claims (6)
1. a kind of flue vapo(u)rization system of desulfurization wastewater, it is characterised in that：The smoke outlet of boiler is de- by bag filter connection
The smoke inlet of sulphur tower, the water inlet of the wastewater outlet connection filtrate box of desulfurizing tower, the water outlet of filtrate box are connected through waste water pump
The water inlet of atomizer, the atomizing nozzle of atomizer connect the high-temperature flue before bag filter entrance.
2. the flue vapo(u)rization system of desulfurization wastewater according to claim 1, it is characterised in that：Atomizer includes fluid hose
Road, the beginning of fluid line are sequentially installed with the small flange of import, flow control valve, flowmeter and mounting flange, fluid line
End is equipped with several atomizers, and each atomizer connects a pressure gauge.
3. the flue vapo(u)rization system of desulfurization wastewater according to claim 1, it is characterised in that：Outside the fluid line of atomizer
Side is enclosed with insulating layer, and insulating layer plays heat-blocking action between runner and high-temperature flue gas.
4. the flue method of evaporating that a kind of flue vapo(u)rization system using desulfurization wastewater described in claim 1 carries out, feature
It is：
Waste water is pumped by waste water in atomizer, is atomized desulfurization wastewater using gas-liquid two-phase flow nozzle, by the useless of atomization
Water enters the high-temperature flue before bag filter entrance, and flue-gas temperature at this time, will be in flue gas using smoke temperature at 130 DEG C ~ 150 DEG C
Moisture evaporating completely, the pollutant in waste water is made to be converted into crystal or salt, solid therein is again by the gravitation of air-introduced machine
Effect is lower to be entered in deduster, is captured together by deduster with the flue dust of flue gas, so as to fulfill the ring of wastewater zero discharge
Protect effect.
5. the flue method of evaporating of desulfurization wastewater according to claim 4, it is characterised in that：The desulfurization of 300MW units is given up
Water is only 5 cubic metres/h, and desulfurization wastewater water temperature is 50 DEG C ~ 55 DEG C, and front flue of dust collector temperature is 140 DEG C ~ 155 DEG C, in flue
The desulfurization wastewater sprayed into after atomization evaporates rapidly in flue, and it is only 5 ~ 10 DEG C that smoke temperature, which declines, and flue-gas temperature is higher than acid dew point, no
Corrosion can be generated to front flue of dust collector and body of deduster, and the physical property and comprehensive utilization of ash will not be had an impact；It is de-
Metallics in sulphur waste water enters with grey in duster system, since the content of metallics accounts for dust content 0.01%, no
Filter bag can be had an impact.
6. the flue method of evaporating of desulfurization wastewater according to claim 4, it is characterised in that：Desulfurization wastewater refers mainly to de- stone
Waste water during cream in knockout drum underflow, i.e., small unit waste water, the liquid in waste water tank, i.e. large-sized unit waste water, in waste water
Main component is：CaCO3, MgCO3, CaF2, flying dust, solid matter accounts for 3 ~ 4% in waste water, and wherein CaSO4.2H2O accounts for 0.6 ~
0.7%, these substances are all inorganic salts, soluble easily in water, are not easy to form sediment.
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| CN201711487492.1A CN108083370A (en) | 2017-12-29 | 2017-12-29 | The flue vapo(u)rization system and method for evaporating of desulfurization wastewater |
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| CN201711487492.1A CN108083370A (en) | 2017-12-29 | 2017-12-29 | The flue vapo(u)rization system and method for evaporating of desulfurization wastewater |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109399747A (en) * | 2018-11-23 | 2019-03-01 | 国网新疆电力有限公司电力科学研究院 | Spray gun and be suitable for desulfurization wastewater flue vaporising device |
| CN110803732A (en) * | 2019-11-29 | 2020-02-18 | 济南山源环保科技有限公司 | Drying and solidifying device for zero discharge of wastewater |
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| CN109399747A (en) * | 2018-11-23 | 2019-03-01 | 国网新疆电力有限公司电力科学研究院 | Spray gun and be suitable for desulfurization wastewater flue vaporising device |
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| CN110803732A (en) * | 2019-11-29 | 2020-02-18 | 济南山源环保科技有限公司 | Drying and solidifying device for zero discharge of wastewater |
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