CN103041923A - Process of recycling ash removing water of wet electrostatic precipitator in thermal power plant - Google Patents

Process of recycling ash removing water of wet electrostatic precipitator in thermal power plant Download PDF

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Publication number
CN103041923A
CN103041923A CN 201210578864 CN201210578864A CN103041923A CN 103041923 A CN103041923 A CN 103041923A CN 201210578864 CN201210578864 CN 201210578864 CN 201210578864 A CN201210578864 A CN 201210578864A CN 103041923 A CN103041923 A CN 103041923A
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CN
China
Prior art keywords
water
ash
power plant
deashing
thermal power
Prior art date
Application number
CN 201210578864
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Chinese (zh)
Inventor
刘文华
成志
范磊
朱英杰
Original Assignee
国家电网公司
山东电力集团公司东营供电公司
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Application filed by 国家电网公司, 山东电力集团公司东营供电公司 filed Critical 国家电网公司
Priority to CN 201210578864 priority Critical patent/CN103041923A/en
Publication of CN103041923A publication Critical patent/CN103041923A/en

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Abstract

The invention relates to a process of recycling ash removing water of a wet electrostatic precipitator in a thermal power plant. The technical scheme of the invention is as follows: the process comprises the following steps: firstly introducing the ash removing water of washing the pole plate from the wet electrostatic precipitator into a down-flow-type sloping plate-shaped settlement tank, allowing the suspended fly ash to settle down in the settlement tank by ash-water separation, and removing a part of suspended matters from water; introducing the effluent from settlement treatment into a coagulation tank, adding coagulants to adsorb fine particles for partial settlement, pumping the non-settled matters together with the sewage into a filter of high-speed quartz sand structure through a sewage pump, performing sand filtration, pumping the sewage sludge from the bottom of the settlement tank and the coagulation tank through a residue/slurry pump, removing suspended matters, adjusting pH of the ash removing water, and delivering the ash removing water to the wet electrostatic precipitator for repeated use through an ash removing water circulating pump. The process has the benefits of recycling the ash removing water to prevent corrosion or scale formation of water treatment equipment and taking full advantage of the wet electrostatic precipitator by recycling the ash removing water.

Description

Thermal power plant's wet electrical dust precipitator deashing water circulation treatment process

Technical field

The present invention relates to a kind of thermal power plant water circulation treatment process, particularly a kind of thermal power plant wet electrical dust precipitator deashing water circulation treatment process.

Background technology

At present, form water membrane in thermal power plant's wet electrical dust precipitator utilization at pole plate and clean the dust that is trapped on the pole plate.Upper direction dust-collecting polar board of electric dust remover at deduster supplies water, and deashing water flows downward under Action of Gravity Field, forms the ash removing water film that covers whole pole plate, takes away the dust that is collected on the dust collecting pole plate, falls into the ash bucket of deduster below.Compare with the dry electric precipitation device and to have the following advantages: do not need rapping equipment, thereby eliminated the reentrainment of dust that rapping causes, can also prevent air-flow, the wind-induced reentrainment of dust of corona; Water membrane is arranged on the pole plate all the time, rinsed out by moisture film immediately after dust (flue dust) become trapped on the pole plate, thereby for high resistivity dust (flue dust), anti-corona can not occur, the reentrainment of dust that anti-corona causes can not occur; For low resistivity dust (flue dust), the particle that can not be captured is fled from pole plate, again the phenomenon in the Returning flow.Because above-mentioned advantage, wet-esp has very high efficiency of dust collection, can be fit to arbitrarily smoke dust discharge concentration can be controlled at below the 10mg/Nm3 than the flue dust of resistance, satisfies in the world the requirement of strict discharge standard.

But, the wet type deashing relies on and forms the dust that moisture film cleans capture on the pole plate, a 135MW unit deashing water needs more than 100 ton, if deashing water is directly drained, not only can cause the huge waste of resource, also can serious environment pollution, and unallowed by the power plant water limit, cause wet-esp not have using value, therefore, deashing water must be recycling.

But, after moisture film cleans pole plate, cause the suspension in the water to increase, if do not process, the recycling obstruction that certainly will cause the water distribution pipe fitting, deashing water becomes mortar, can't clean pole plate.

The water quality of deashing water not only depends on flyash composition and dust collection efficiency, the gas-liquid exchange process that also depends on moisture film and flue gas, major pollutants are the flyash suspension, because wet type deashing electric field is in the end of electric precipitation, the particle size of fly ash of its capture is very thin, the overwhelming majority is below 10 μ m, particle diameter is at 6.62 μ m among the result of experimental test, and owing to sour gas dissolves in, repeatedly pH value is reduced to 3 after the circulation, in order to prevent corrosion and the fouling to water treatment facilities, deashing water ph value to be adjusted, its acid-base value changes.

Summary of the invention

Purpose of the present invention is exactly in view of the foregoing defects the prior art has, and a kind of thermal power plant wet electrical dust precipitator deashing water circulation treatment process is provided, and the drawback of wet electrical dust precipitator is inhibited, and its using value gets the nod and promotes.

Its technical scheme is comprised of following technique:

Deashing water from the flushing pole plate of electric cleaner at first enters the sedimentation basin of downflow system swash plate shape, and suspension flyash carries out the Ash Water Separator precipitation in sedimentation basin, remove part suspension in the water; Enter coagulating basin through the water outlet after the precipitation process, adding entrance by coagulated agent, to add mass percent concentration in the collecting-tank be the coagulant that polyacrylamide solution that 1% aluminium polychloride and mass percent concentration are 0.1% concentration forms, fine particle is attached on the flco, partly precipitated, unprecipitatedly outputed in the filter of high speed quartz sand structure by sewage pump with sewage, through after the sand filtration, make suspension in the water less than 70mg/L; Mud is extracted out with the slag stock pump from sedimentation basin, coagulating basin bottom, delivers to the ash field of power plant, or transports outward after the concentration;

After removing suspension, deashing water ph value being adjusted, according to the scope of application of anticorrosion, antiscale and coagulant, is 5-9 with ph value modification scope, transports in the electric cleaner recycling by the deashing water-circulating pump.

Above-mentioned collecting-tank is provided with the ph value and regulates mouth and supplementing water entrance.

The top of above-mentioned electric cleaner is provided with the sprinkler head of umbrella, and the deashing water of process circular treatment enters electric cleaner again by sprinkler head.

The sedimentation basin of above-mentioned downflow system swash plate shape is comprised of entrance, swash plate filter and outlet, and the main body inner chamber is provided with the swash plate filter, and the top is provided with entrance, is provided with outlet in the bottom of main body.

The invention has the beneficial effects as follows: by adding coagulated agent, fine particle in the buck is attached on the flco, partly precipitated, after removing suspension, deashing water ph value is adjusted, transport in the electric cleaner by the deashing water-circulating pump recycling, thereby prevent corrosion and fouling to water treatment facilities, deashing water is obtained recycling, fully play the advantage of wet-esp.

Description of drawings

Accompanying drawing 1 is schematic flow sheet of the present invention;

Accompanying drawing 2 is structural representations of sedimentation basin of the present invention;

Among the upper figure: electric cleaner 1, sprinkler head 2, clear water collecting-tank 3, deashing water-circulating pump 4,

Sedimentation basin a1,, coagulating basin a2, filter a3, ph value regulate a mouthful a4, supplementing water entrance a5, sewage pump a6, slag stock pump a7, coagulated agent and add entrance a8, flushing pole plate water a9, entrance a1.1, swash plate filter a1.2 and outlet a1.3.

The specific embodiment

1-2 by reference to the accompanying drawings, the invention will be further described:

The present invention is comprised of following technique: the deashing water a9 from the flushing pole plate of electric cleaner 1 at first enters the sedimentation basin a1 of downflow system swash plate shape, and suspension flyash carries out the Ash Water Separator precipitation in sedimentation basin a1, remove part suspension in the water; Enter coagulating basin a2 through the water outlet after the precipitation process, adding entrance a8 by coagulated agent, to add mass percent concentration in the collecting-tank 3 be the coagulant that polyacrylamide solution that 1% aluminium polychloride and mass percent concentration are 0.1% concentration forms, fine particle is attached on the flco, partly precipitated, unprecipitatedly outputed among the filter a3 of high speed quartz sand structure by sewage pump a6 with sewage, through after the sand filtration, make suspension in the water less than 70mg/L; Mud is extracted out with slag stock pump a7 from sedimentation basin a1, coagulating basin a2 bottom, delivers to the ash field of power plant, or transports outward after the concentration;

After removing suspension, deashing water ph value being adjusted, according to the scope of application of anticorrosion, antiscale and coagulant, is 5-9 with ph value modification scope, transports in the electric cleaner by deashing water-circulating pump 4, and when deashing water ph value was lower than 5, hydro-oxidation sodium was adjusted to 9.

Above-mentioned collecting-tank 3 is provided with the ph value and regulates mouthful a4 and supplementing water entrance a5; The top of above-mentioned electric cleaner 1 is provided with the sprinkler head 2 of umbrella, and the deashing water of process circular treatment enters electric cleaner 1 again by sprinkler head 2.The sedimentation basin a1 of above-mentioned downflow system swash plate shape is comprised of entrance a1.1, swash plate filter a1.2 and outlet a1.3, and the main body inner chamber is provided with swash plate filter a1.2, and the top is provided with entrance a1.1, is provided with outlet a1.3 in the bottom of main body.

Claims (4)

1. thermal power plant's wet electrical dust precipitator deashing water circulation treatment process is characterized in that being comprised of following technique:
Deashing water (a9) from the flushing pole plate of electric cleaner (1) at first enters the sedimentation basin (a1) of downflow system swash plate shape, and suspension flyash carries out the Ash Water Separator precipitation in sedimentation basin (a1), remove part suspension in the water; Enter coagulating basin (a2) through the water outlet after the precipitation process, adding entrance (a8) by coagulated agent, to add mass percent concentration in the collecting-tank (3) be the coagulant that polyacrylamide solution that 1% aluminium polychloride and mass percent concentration are 0.1% concentration forms, fine particle is attached on the flco, partly precipitated, unprecipitatedly outputed in the filter (a3) of high speed quartz sand structure by sewage pump (a6) with sewage, through after the sand filtration, make suspension in the water less than 70mg/L; Mud is extracted out with slag stock pump (a7) from sedimentation basin (a1), coagulating basin (a2) bottom, delivers to the ash field of power plant, or transports outward after the concentration;
After removing suspension, deashing water ph value being adjusted, according to the scope of application of anticorrosion, antiscale and coagulant, is 5-9 with ph value modification scope, transports in the electric cleaner recycling by deashing water-circulating pump (4).
2. thermal power plant according to claim 1 wet electrical dust precipitator deashing water circulation treatment process, it is characterized in that: described collecting-tank (3) is provided with the ph value and regulates mouthful (a4) and a supplementing water entrance (a5).
3. thermal power plant according to claim 1 wet electrical dust precipitator deashing water circulation treatment process, it is characterized in that: the top of described electric cleaner (1) is provided with the sprinkler head (2) of umbrella, and the deashing water of process circular treatment enters electric cleaner (1) again by sprinkler head (2).
4. thermal power plant according to claim 1 wet electrical dust precipitator deashing water circulation treatment process, it is characterized in that: the sedimentation basin (a1) of described downflow system swash plate shape is comprised of entrance (a1.1), swash plate filter (a1.2) and outlet (a1.3), the main body inner chamber is provided with swash plate filter (a1.2), the top is provided with entrance (a1.1), is provided with outlet (a1.3) in the bottom of main body.
CN 201210578864 2012-12-28 2012-12-28 Process of recycling ash removing water of wet electrostatic precipitator in thermal power plant CN103041923A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103386226A (en) * 2013-08-09 2013-11-13 蒋浩 Full-automatic filtration and cyclic utilization device for gray water of wet-type electric precipitator
CN103553243A (en) * 2013-11-14 2014-02-05 安徽省绿巨人环境技术有限公司 Boiler exhaust gas and wastewater treatment technology
CN103785538A (en) * 2014-03-05 2014-05-14 戴若夫 Static air filtration box with circulating water cleaning system
CN103817006A (en) * 2014-03-05 2014-05-28 戴若夫 Static air filtration box cleaning method based on circulating water system
CN103925589A (en) * 2013-09-14 2014-07-16 李永华 Boiler energy saving and heat exchanging technology implemented by aid of efficient separation method
CN104129868A (en) * 2013-05-02 2014-11-05 王延军 Wastewater treatment and recycling device and wastewater treatment technology
CN104759347A (en) * 2015-02-27 2015-07-08 广东电网有限责任公司电力科学研究院 Method and device for spray of agglomerator solution by electric dust collector to promote PM2.5 removal
CN105481143A (en) * 2016-01-06 2016-04-13 上海超清环保科技有限公司 Coal-fired boiler tail flue gas dust removal sewage cycle processing system
CN105540920A (en) * 2015-12-18 2016-05-04 新昌中法供水有限公司 Conventional water treatment strengthening filtering process

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104129868B (en) * 2013-05-02 2016-05-18 王延军 The technique of wastewater treatment and reclamation set and processing waste water
CN104129868A (en) * 2013-05-02 2014-11-05 王延军 Wastewater treatment and recycling device and wastewater treatment technology
CN103386226A (en) * 2013-08-09 2013-11-13 蒋浩 Full-automatic filtration and cyclic utilization device for gray water of wet-type electric precipitator
CN103925589A (en) * 2013-09-14 2014-07-16 李永华 Boiler energy saving and heat exchanging technology implemented by aid of efficient separation method
CN103553243A (en) * 2013-11-14 2014-02-05 安徽省绿巨人环境技术有限公司 Boiler exhaust gas and wastewater treatment technology
CN103785538A (en) * 2014-03-05 2014-05-14 戴若夫 Static air filtration box with circulating water cleaning system
CN103817006A (en) * 2014-03-05 2014-05-28 戴若夫 Static air filtration box cleaning method based on circulating water system
CN104759347A (en) * 2015-02-27 2015-07-08 广东电网有限责任公司电力科学研究院 Method and device for spray of agglomerator solution by electric dust collector to promote PM2.5 removal
CN105540920A (en) * 2015-12-18 2016-05-04 新昌中法供水有限公司 Conventional water treatment strengthening filtering process
CN105481143A (en) * 2016-01-06 2016-04-13 上海超清环保科技有限公司 Coal-fired boiler tail flue gas dust removal sewage cycle processing system

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Application publication date: 20130417