CN105413871A - Process and device for removing ash of high-temperature electrostatic precipitator by sectional spraying coupling with water film flushing - Google Patents

Process and device for removing ash of high-temperature electrostatic precipitator by sectional spraying coupling with water film flushing Download PDF

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Publication number
CN105413871A
CN105413871A CN201510979728.8A CN201510979728A CN105413871A CN 105413871 A CN105413871 A CN 105413871A CN 201510979728 A CN201510979728 A CN 201510979728A CN 105413871 A CN105413871 A CN 105413871A
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anode
water tank
moisture film
deashing
water
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CN105413871B (en
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常景彩
马春元
王鹏
崔琳
王翔
张静
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Shandong University
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Shandong University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C3/00Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
    • B03C3/34Constructional details or accessories or operation thereof
    • B03C3/74Cleaning the electrodes
    • B03C3/78Cleaning the electrodes by washing

Abstract

The invention relates to a process and a device for removing ash of a high-temperature electrostatic precipitator by sectional spraying coupling with water film flushing. The device is characterized in that a last-stage electric field ash removing manner is that the sectional spraying and a continuous water film are coupled to enable efficient ash removing, and cathodic and anodic vibrating ash removing systems are saved; a composite anode plate with high surface water film forming property is used as an anode; a clean water tank is used as a water source of a water film flushing system; a main water film flushing tube is firmly welded to a plurality of anodic water distributing tubes to form an independent pipe network; the clean water tank is used as the water source of a spraying flushing system, and a plurality of branch tubes are welded in a fishbone form at two sides of each main spraying flushing tube; water film flushing liquid flows through the surface of the composite anode plate by water outlet holes in the bottom parts of the anodic water distributing tubes so as to completely flush away ash particles deposited on the surface of the anode plate, and then the water film flushing liquid flows into a sewage tank; the liquid in the sewage tank is separated through a horizontal screw centrifuge; the clean liquid is pumped into the clean water tank, and the sludge is recycled; the spraying amount and starting frequency of the spraying flushing pipe network are set based on the principle that the instantaneous smoke humidity variation is controlled to be 0.5 to 2%.

Description

A kind of hot electrostatic precipitator subregion spray coupling moisture film rinses deashing technique and device
Technical field
The invention belongs to atmosphere pollution and administer field, particularly relate to a kind of subregion spray irrigation coupling being applicable to high temperature electrostatic deduster and continue moisture film deashing technique and device.
Background technology
In view of Environmental Protection in China administers pressure severe situation, active service Emission in Coal-fired Power Plant concentration standard all will reach substantially or close to gas turbine group emission limit, namely chimney entrance total particulate concentration is less than 5mg/Nm 3.For large-scale Thermal generation unit, flue gases purification route after coal combustion, generally need successively by low nitrogen burning → selective-catalytic-reduction denitrified → electrostatic precipitation → limestone-gypsum method wet desulphurization → wet static dedusting in stove according to upstream and downstream position.Wherein wet cottrell is as final one barrier of coal-fired flue-gas particle process, in wet flue gas process before chimney entrance, play trapping desulfurization to carry gypsum slurries, electrostatic precipitator escape fine particle etc. secretly and combine the effect of removing, the gas cleaning usefulness of its excellence makes it to be widely applied rapidly in large-scale Thermal generation unit.But, in oil, chemical industry, smelting and other industry, even in the energy source conversion system of current advanced person, (integral coal gasification gas combustion-gas vapor combined cycle technology (IGCC) and pressurized fluidized bed combustion combined cycle generation technology (PFBC)) often produces high-temperature flue gas, the needs required for certain special process or qualified discharge must carry out dedusting to high-temperature flue gas, and its smoke content is controlled within a certain specific limit value.Compared with the flue-gas temperature condition of routine, implement gas solid separation under hot conditions and there is higher difficulty, therefore high temperature electrostatic deduster (general smoke treatment temperature is greater than 300 DEG C) is as a kind of effective means purifying coal-fired high-temperature flue gas, possesses good application prospect, especially at home and abroad apply in the industry such as metal smelt and manufacture of cement and reach certain scale, and occupy considerable status in high-temperature flue gas process field over a period to come.But hot electrostatic precipitator is compared with conventional electric cleaner, there are some defects.In usual dust collection process, the average grain diameter of the dust that each electric field is collected, unit hour quality, arresting efficiency all present sharply downward trend along one, two, three, four electric field equal distribution, and during arrival final stage electric field, fly ash content is mostly between 50 ~ 200mg/m 3, grain diameter is generally less than 2.5 microns, and the numbers of particles being wherein less than 1 micron accounts for more than 90%, and particle ratio resistance is many between 1 × 10 11~ 5 × 10 12Ω cm, now on final stage electric field dust collecting pole plate, high resistivity dust gathers and causes inverse corona problem particularly outstanding, concrete manifestation dust collecting pole plate dust adhesive force increases deashing difficulty, dust secondary fly-up is serious, corona current conducts not smooth by dust layer, finally between the gap of dust layer, produce partial breakdown, cause efficiency of dust collection significantly to worsen.
Summary of the invention
The present invention is directed to deashing difficulty and the inverse corona serious problems of the existence of hot electrostatic precipitator running, propose the novel ash removal method adopting the lasting moisture film of a kind of little subregion spray irrigation coupling to wash away at electric cleaner end electric field, first its technology characteristics is washed away will be deposited on the high resistivity dust layer cleaning on dust collecting pole plate surface thoroughly by the lasting moisture film on positive plate surface, the periodically little subregion spray irrigation technique that has simultaneously been coupled removes the deposition dust being attached to discharge electrode and anode beams structural member surface, the coupling of little subregion spray irrigation continues novel ash removal method that moisture film washes away, and to effectively prevent the secondary fly-up that vibration dust-cleaning mode that hot electrostatic precipitator generally adopts causes serious, and polar board surface gather dust layer produce inverse corona cause efficiency of dust collection worsen a difficult problem, ensure that high temperature electrostatic deduster realizes continuing Effec-tive Function.
The present invention realizes in the following way:
The coupling of a kind of hot electrostatic precipitator subregion spray irrigation continues moisture film high-efficient cleaning apparatus for ash, comprise a housing, one end of described housing is smoke inlet, the relative other end is exhanst gas outlet, described housing bottom is be provided with multiple ash bucket communicated with enclosure interior, multiple deduster electric field is divided in described housing, and along the direction of flow of flue gas, spray irrigation device is provided with successively from top to bottom in the housing of final stage electric field, moisture film flusher and positive plate and cathode suspended beam, described cathode suspended beam is provided with cathode line vertically downward, and cathode suspended beam is connected with high voltage source.
Described spray irrigation device comprises a filtered water tank, and described filtered water tank is communicated with the supervisor be arranged in final stage electric field housing, and each described supervisor is communicated with multiple arm, and described arm is provided with nozzle.
Described spray irrigation device also comprises a foul water tank, and the entrance of described foul water tank is connected with the ash bucket of final stage electric field housing bottom, exports and is connected with a centrifuge, and the clear water of described centrifuge process is pumped into filtered water tank by one.
Described moisture film flusher comprises a moisture film be connected with filtered water tank and rinses and be responsible for, described moisture film rinses supervisor and is connected with some anode water distributors, the bottom of described anode water distributor is provided with apopore, and is provided with the positive plate corresponding with apopore in the bottom of anode water distributor.
Several anode superstructure intervals be welded on housing; Described positive plate upper and lower part is connected with anode water distributor, anode lower frame by bolt respectively.
The composite material anode plate that described positive plate adopts surperficial moisture film film forming characteristics good, includes but not limited to flexible fiber, hydrophilic modifying rigid anode plate or hydrophilic coating positive plate.
Described final stage electric field housing and inner part all do preservative treatment.
Described negative electrode line style includes but not limited to jaggies, RS prickle wire or fish-bone line.
Described cathode suspended beam is connected with high voltage source by the porcelain insulator be placed in insulated case.
The ash removal method of described device is as follows:
The initial coal-fired flue-gas of step 1 carries flue dust and enters conventional electric precipitation electric field, and in flue gas, to be greater than the particle of 5 μm all captured for particle diameter;
Step 2 enter final stage electric field containing fine particle flue gas at large, under the effect of electric field force, fine particle moves to composite anode plate surface, is adsorbed fast by composite anode plate surface uniform moisture film;
Step 3 moisture film flushing water is delivered to after moisture film flushing supervisor by filtered water tank through booster pump, enter anode tube, apopore on anode water distributor flows out, and the dust being enriched to positive plate surface along composite material anode plate uniform spreading, is rinsed well by water under gravity;
After step 4 flushing liquor enters ash bucket collection, gravity flow enters foul water tank; Sewage in foul water tank enters horizontal screw centrifuge through feed pipe and carries out Separation of Solid and Liquid; Part clear liquid is back to moisture film through booster pump and rinses female pipe, recycles; Another part clear liquid pumps into after spray irrigation supervisor through booster pump and enters spray irrigation arm, is finally sprayed by the nozzle be fixed on spray irrigation arm, is used for intermittently rinsing cathode line and other fixed frame;
Described spray irrigation pipe network is opened the frequency and is looked smoke moisture amplitude of variation and the change of outlet flue dust index, and control electrically operated valve by PLC and control, when ensureing to adopt little subregion spray irrigation subnormal voltage operation, smoke moisture and soot emissions index all reach designing requirement.
Described nozzle atomization size controlling, at 300 ~ 3000 μm, prevents atomizing particle size too small, and drop evaporation capacity is excessive, causes smoke moisture acute variation to affect follow-up equipment and runs.
Deduster final stage electric field purge mode of the present invention is that the coupling of subregion spray continues the efficient deashing of moisture film, without anode and cathode vibration dust-cleaning system; The composite material anode plate that anode adopts surperficial moisture film film forming characteristics good; Moisture film rinse-system water source draws from filtered water tank, and moisture film flushing water supervisor forms independent pipe network with many anode water distributor firm welding, and start and stop are controlled by PLC; Spray irrigation system water source draws from filtered water tank, and every root spray irrigation supervisor welds several arm according to fish-bone form in both sides, and to gather carborundum nozzle by a fixed sequence in arm and supervisor bottom, atomizing particle size is 300 ~ 3000 μm, and coverage rate is 120 ~ 180%; Moisture film flushing liquid flows through composite material electrode plate surface by apopore bottom anode water distributor, rinses the dust particles being deposited on positive plate surface well rear inflow foul water tank; Foul water tank liquid is after horizontal screw centrifuge is separated, and clear liquid pumps into filtered water tank, body refuse recycling; Spray irrigation pipe network spray flux and startup frequency setting principle are changed to 0.5 ~ 2% for controlling smoke moisture instantaneously.
Deduster final stage electric field structure size, high voltage source input etc. are all identical with anterior electric field; Final stage electric field top anode superstructure is the anode water distributor that array intermittent weld is connected on housing; Composite material anode plate upper and lower part is connected firmly by bolt and anode superstructure; Spray irrigation supervisor, moisture film rinse supervisor and are all connected with the flange bolt be welded on housing, connect filtered water tank by pipeline, are controlled start and stop by PLC, are rinsed duration and the frequency; Spray irrigation arm is welded on according to fish bony spur form and rinses on supervisor, forms spray irrigation pipe network, and gather nozzle by the they sup-port be welded on anode water distributor in spray irrigation pipe network bottom; Moisture film flushing liquid flows automatically to foul water tank by the ash bucket be welded on bottom deduster, and foul water tank liquid sends into horizontal screw centrifuge through feed worm pump, pipeline, and isolated clear liquid pumps into filtered water tank through booster pump and recycles, and mud cake transport is dispatched from the factory.
Beneficial effect of the present invention is as follows:
A kind of subregion spray irrigation coupling being applicable to high temperature electrostatic deduster that the present invention proposes continues moisture film deashing technique and device, by carrying out the upgrading of ash removal method to traditional deduster final stage electric field, namely the coupling of subregion spray irrigation is adopted to continue moisture film deashing new technology, effectively prevent former final stage electric field because collecting the vibration dust-cleaning weak effect of the too high initiation of dust specific resistance, dust secondary fly-up is serious, the problems such as inverse corona takes place frequently, ensure that high-temperature flue gas flue dust realizes minimum discharge target from deashing principle, the anode synchronously achieved under low water consumption rinses thoroughly, flushing water recycles and solid wastes recycling utilizes, there is wide market application foreground.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the front view of electric cleaner;
Fig. 2 is the A-A sectional view of electric cleaner final stage electric field spray irrigation system;
Fig. 3 is the B-B sectional view of electric cleaner final stage electric field moisture film rinse-system.
In figure, 1 is deduster import end socket, 2 is deduster import deflector, 3 is insulated case, 4 is deduster electric field, 5 is cathode suspended beam, 6 is cathode line, 7 are responsible for for moisture film rinses, 8 is spray irrigation supervisor flange, 9 are responsible for flange for moisture film rinses, 10 is electrically operated valve, 11 is booster pump, 12 is filtered water tank, 13 is storehouse pump, 14 is ash bucket, 15 is foul water tank, 16 is horizontal screw centrifuge, 17 is porcelain insulator, 18 is spray irrigation supervisor, 19 is spray irrigation arm, 20 is nozzle, 21 is anode water distributor, 22 is high voltage source, 23 is composite material anode plate, 24 is apopore.
Detailed description of the invention
A best detailed description of the invention of the present invention is provided below in conjunction with Fig. 1, Fig. 2, Fig. 3.
As shown in Figure 1, 2, 3, the coupling of hot electrostatic precipitator subregion spray irrigation continues moisture film high-efficient cleaning apparatus for ash and is made up of outer case of dust remover, negative electrode, anode, spray irrigation system, moisture film rinse-system, high voltage source, insulator etc., and overall annexation is as follows:
One end of described housing is smoke inlet, the relative other end is exhanst gas outlet, described housing bottom is be provided with multiple ash bucket communicated with enclosure interior, multiple deduster electric field is divided in described housing, and along the direction of flow of flue gas, spray irrigation device, moisture film flusher and positive plate and cathode suspended beam 5 is provided with successively from top to bottom in the housing of final stage electric field, described cathode suspended beam is provided with cathode line 6 vertically downward, and cathode suspended beam is connected with high voltage source.
Concrete, spray irrigation device is made up of spray irrigation supervisor 18, spray irrigation arm 19, nozzle 20, filtered water tank 12, foul water tank 15, horizontal screw centrifuge 16, booster pump 11, plc controller etc.; Described filtered water tank 12 is responsible for 18 with the spray irrigation be arranged in final stage electric field housing and is communicated with, and each described spray irrigation supervisor 18 is communicated with multiple spray irrigation arm 19, and described spray irrigation arm 19 is provided with nozzle 20.The entrance of described foul water tank 15 is connected with the ash bucket 14 of final stage electric field housing bottom, outlet is connected with a horizontal screw centrifuge 16, the clear water that described horizontal screw centrifuge 16 processes sends into filtered water tank 12 by a booster pump, and is provided with electrically operated valve 10 spray irrigation supervisor with the link circuit mountain of filtered water tank 12;
Concrete, described moisture film flusher comprises a moisture film be connected with filtered water tank 12 and rinses supervisor 7, described moisture film rinses supervisor 7 and is connected with some anode water distributors 21, the bottom of described anode water distributor 21 is provided with apopore 24, and is provided with the composite material anode plate 23 relative with apopore in the bottom of anode water distributor 21.
Several anode water distributor 21 intervals be welded on housing; Described positive plate upper and lower part is connected with anode water distributor, anode lower frame by bolt respectively.
In the present invention, deduster final stage electric field purge mode is that the coupling of subregion spray continues the efficient deashing of moisture film, without anode and cathode mechanical rapping cleaning dust device; Final stage electric field housing and inner part all do preservative treatment; The composite material anode plate 23 that anode adopts surperficial moisture film film forming characteristics good, includes but not limited to flexible fiber, hydrophilic modifying rigid anode plate, hydrophilic coating positive plate etc.; Negative electrode line style includes but not limited to jaggies, RS prickle wire, fish-bone line etc.;
Moisture film rinse-system water source draws from filtered water tank 12, and moisture film rinses supervisor and forms independent pipe network with many anode water distributor 21 firm welding, and start and stop are controlled by PLC;
Spray irrigation system water source draws from filtered water tank 12, and every root spray irrigation supervisor welds several arm according to fish-bone form in both sides, and to gather carborundum nozzle by a fixed sequence in arm and supervisor bottom, atomizing particle size is 300 ~ 3000 μm, and coverage rate is 120 ~ 180%;
Moisture film flushing liquid flows through composite material electrode plate surface by apopore bottom anode water distributor 21, rinses the dust particles being deposited on positive plate surface well rear inflow foul water tank; Foul water tank 15 liquid is after horizontal screw centrifuge 16 is separated, and clear liquid pumps into filtered water tank 12, and body refuse is as high added value insulation insulating materials recycling; Spray irrigation pipe network spray flux and startup frequency setting principle are changed to 0.5 ~ 2% for controlling smoke moisture instantaneously.
Apparatus of the present invention are characterised in that, the anterior electric field structure of deduster, pole formula formula, vibration dust-cleaning mode, high voltage source input etc. are all identical with traditional electrical deduster; Final stage electric field top anode superstructure is the anode water distributor 21 that array intermittent weld is connected on housing, and composite material electrode plate upper and lower part is connected firmly by bolt and chongyang pole water distributor 21 and lower anode framework; Spray irrigation supervisor 18, moisture film rinse supervisor 7 and are all bolted with the flange be welded on housing, spray irrigation arm 19 is welded on according to fish bony spur form and rinses the several spray irrigation pipe network of the upper formation of supervisor, and each spray irrigation pipe network is by the they sup-port be welded on anode water distributor 21; Shower water supervisor be connected by pipeline with filtered water tank 12; Moisture film rinse supervisor 7 by pipeline and desulfurizing tower with technique water tank be connected; Flushing liquid in the electric field ash bucket of end is by pipeline self to foul water tank 15, and foul water tank 15 liquid sends into horizontal screw centrifuge 16 through feed worm pump, pipeline, and isolated clear liquid pumps into filtered water tank 12 through booster pump and recycles.
The coupling of hot electrostatic precipitator subregion spray continues the efficient deashing technique of moisture film, as follows:
High-temperature flue gas, by deduster import end socket 1, enters in deduster electric field 4 after deduster import deflector 2 homogenizing.Moisture film rinse supervisor 7 with bolt and case weld firmly moisture film rinse and be responsible for flange 9 and be connected; Spray irrigation supervisor 18 with bolt and case weld firmly spray irrigation be responsible for flange 8 and be connected.High voltage source 22 connects cathode suspended beam 5 by the porcelain insulator 17 be placed in insulated case 3, is applied to by high-tension electricity in cathode line 6, produces corona discharge; Most dust particles of anterior electric field trapping enter the storehouse pump 13 bottom deduster, enter ash silo by Geldart-D particle; Particle in final stage electric field charged and electric field force move under influence to composite material anode plate 23 surface and deposit; Moisture film flushing water is delivered to after moisture film flushing supervisor 7 by filtered water tank 12 through booster pump 11, enter anode water distributor 21, apopore 24 on anode water distributor 21 flows out, water is under gravity along composite material anode plate 23 uniform spreading, the dust being enriched to positive plate surface is rinsed well, ensure final stage electric field cleaner Effec-tive Function all the time, occur without back corona phenomenon, realize flue gas flue dust minimum discharge target; Flushing liquor enters ash bucket 14 and collects rear gravity flow and enter foul water tank 15; Sewage in foul water tank 15 enters horizontal screw centrifuge 16 through feed pipe and carries out Separation of Solid and Liquid; Part clear liquid is back to moisture film through booster pump 11 and rinses female pipe 7, recycles; Another part clear liquid pumps into after spray irrigation supervisor 18 through booster pump 11 and enters spray irrigation arm 19, finally sprayed by 20 nozzles be fixed on spray irrigation arm 19, be used for intermittently rinsing cathode line and other fixed frame, ensure that enclosure interior part is all in clean conditions.Spray irrigation pipe network is opened the frequency and is looked smoke moisture amplitude of variation and the change of outlet flue dust index, and control electrically operated valve 10 by PLC and control, when ensureing to adopt little subregion spray irrigation subnormal voltage operation, smoke moisture and soot emissions index all reach designing requirement.
Specific implementation operating process is:
Initial coal-fired flue-gas carries smoke content 15 ~ 40g/m 3temperature is 110 ~ 500 DEG C, with 0.8 ~ 1.2m/s speed by level Four electric field before electric cleaner, under the effect of electric field force, movement of particles forms dust layer to positive plate surface, by the mechanical shaking device that fixed time intervals is opened, shake from positive plate surface and drop down onto in the pump of storehouse, through Geldart-D particle to ash silo; Enter the dust content of final stage electric field between 50 ~ 200mg/m 3between, surperficial to dust collector pole at the move under influence of electric field force, adsorbed by composite anode plate surface uniform moisture film fast, electric charge release is complete and rapid, thoroughly avoids former electrostatic field and discharges the slow inverse corona problem caused because particle ratio resistance is larger in metal polar plate surface charge; The particle being deposited on positive plate surface the flushing of continuous surface moisture film dirty enter ash bucket, holding anode plate surface cleaning, solves from root the defect that former electrostatic field causes reentrainment of dust serious because of particle ratio resistance high viscosity large increase mechanical vibrator dynamics; Moisture film rinse-system water source draws from filtered water tank, cleaning liquid flow by gravity is to foul water tank, deliver to horizontal screw centrifuge through feed pipe and carry out high speed Separation of Solid and Liquid, the clear water that solid content is less than 0.05% enters filtered water tank, by booster pump deliver to spray irrigation be responsible for and moisture film flushing supervisor recycle, body refuse is as being rich in glass microballoon class thermal insulating high added value material by recycling; The smoke evaporative water yield by the moisturizing of power plant process water to filtered water tank; Spray irrigation system water source draws from filtered water tank, and nozzle selects the corrosion-resistant carborundum nozzle safe and reliable to operation of heat resistant and wear resistant, and the parts such as target and anode construction beam carry out interval and rinse, and ensures that housing and inner part clean all the time; Nozzle atomization size controlling, at 300 ~ 3000 μm, prevents atomizing particle size too small, and drop evaporation capacity is excessive, causes smoke moisture acute variation to affect follow-up equipment and runs; Spray irrigation pipe network spray flux is changed to 0.5 ~ 2% with startup frequency setting principle for controlling smoke moisture instantaneously, and controlled by PLC, during guarantee employing little subregion spray irrigation subnormal voltage operation, smoke moisture and soot emissions index all reach designing requirement simultaneously.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that creative work can make still within protection scope of the present invention.

Claims (10)

1. a hot electrostatic precipitator subregion spray coupling moisture film rinses deashing device, comprise a housing, one end of described housing is smoke inlet, the relative other end is exhanst gas outlet, described housing bottom is be provided with multiple ash bucket communicated with enclosure interior, multiple deduster electric field is divided in described housing, it is characterized in that: along the direction of flow of flue gas, spray irrigation device is provided with successively from top to bottom in the housing of final stage electric field, cathode suspended beam, moisture film flusher and positive plate, described cathode suspended beam is provided with cathode line vertically downward, and cathode suspended beam is connected with high voltage source.
2. deashing device as claimed in claim 1, it is characterized in that, described spray irrigation device comprises a filtered water tank, and described filtered water tank is communicated with the supervisor be arranged in final stage electric field housing, and each described supervisor is communicated with multiple arm, and described arm is provided with nozzle.
3. deashing device as claimed in claim 2, it is characterized in that, described spray irrigation device also comprises a foul water tank, the entrance of described foul water tank is connected with the ash bucket of final stage electric field housing bottom, outlet is connected with a centrifuge, and the clear water of described centrifuge process sends into filtered water tank again by a pump.
4. deashing device as claimed in claim 1, it is characterized in that, described moisture film flusher comprises a moisture film be connected with filtered water tank and rinses and be responsible for, described moisture film rinses supervisor and is connected with some anode water distributors, described anode water distributor is provided with apopore, and is provided with the positive plate relative with apopore in the bottom of anode water distributor.
5. deashing device as claimed in claim 4, is characterized in that, several anode water distributor intervals be welded on housing; Described positive plate upper and lower part is connected with anode water distributor, anode lower frame respectively by bolt.
6. deashing device as claimed in claim 1, it is characterized in that, described positive plate adopts the composite material anode plate of surperficial moisture film film forming characteristics, includes but not limited to flexible fiber, hydrophilic modifying rigid anode plate and hydrophilic coating positive plate.
7. deashing device as claimed in claim 1, it is characterized in that, described final stage electric field housing and inner part all do preservative treatment.
8. deashing device as claimed in claim 1, it is characterized in that, described negative electrode line style includes but not limited to jaggies, RS prickle wire or fish-bone line.
9. the deashing technique of deashing device as claimed in claim 1, is characterized in that, as follows:
The initial coal-fired flue-gas of step 1 carries flue dust and enters conventional electric precipitation electric field, and in flue gas, to be greater than the particle of 5 μm all captured for particle diameter;
Step 2 enter final stage electric field containing fine particle flue gas at large, under the effect of electric field force, fine particle moves to composite anode plate surface, is adsorbed fast by composite anode plate surface uniform moisture film;
Step 3 moisture film flushing water is delivered to after moisture film flushing supervisor by filtered water tank through booster pump, enter anode tube, apopore on anode water distributor flows out, and the dust being enriched to positive plate surface along composite material anode plate uniform spreading, is rinsed well by water under gravity;
After step 4 flushing liquor enters ash bucket collection, gravity flow enters foul water tank; Sewage in foul water tank enters horizontal screw centrifuge through feed pipe and carries out Separation of Solid and Liquid; Part clear liquid is back to moisture film through booster pump and rinses female pipe, recycles; Another part clear liquid pumps into after spray irrigation supervisor through booster pump and enters spray irrigation arm, is finally sprayed by the nozzle be fixed on spray irrigation arm, is used for intermittently rinsing cathode line and other fixed frame.
10. the deashing technique of deashing device as claimed in claim 1, is characterized in that, described spray irrigation pipe network is opened the frequency and looked smoke moisture amplitude of variation and the change of outlet flue dust index, controls electrically operated valve control by PLC.
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CN105921279A (en) * 2016-05-16 2016-09-07 山东大学 Integrated cathode and anode suspension supporting water film dust removal roof electric precipitation device and system
CN108480043A (en) * 2018-03-09 2018-09-04 陈阳 A kind of electric smoke precipitation equipment for handling dust in boiler smoke

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CN104056723A (en) * 2014-06-06 2014-09-24 浙江南源环境工程技术有限公司 Recirculating water treatment system for ash removal spraying water of wet electrostatic dust collector

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* Cited by examiner, † Cited by third party
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CN105921279A (en) * 2016-05-16 2016-09-07 山东大学 Integrated cathode and anode suspension supporting water film dust removal roof electric precipitation device and system
CN108480043A (en) * 2018-03-09 2018-09-04 陈阳 A kind of electric smoke precipitation equipment for handling dust in boiler smoke
CN108480043B (en) * 2018-03-09 2019-10-22 黑龙江省建筑安装集团有限公司 It is a kind of for handling the electric smoke precipitation equipment of dust in boiler smoke

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