CN112371341A - Ultra-low emission dust remover for coal-fired power plant - Google Patents
Ultra-low emission dust remover for coal-fired power plant Download PDFInfo
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- CN112371341A CN112371341A CN202011119087.6A CN202011119087A CN112371341A CN 112371341 A CN112371341 A CN 112371341A CN 202011119087 A CN202011119087 A CN 202011119087A CN 112371341 A CN112371341 A CN 112371341A
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- 239000000428 dust Substances 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 238000011010 flushing procedure Methods 0.000 claims abstract description 18
- 238000009826 distribution Methods 0.000 claims abstract description 12
- 239000007921 spray Substances 0.000 claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 3
- 239000011521 glass Substances 0.000 claims abstract description 3
- 239000010959 steel Substances 0.000 claims abstract description 3
- 239000000779 smoke Substances 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 8
- 239000010865 sewage Substances 0.000 claims description 7
- 229910001069 Ti alloy Inorganic materials 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 241000272525 Anas platyrhynchos Species 0.000 claims description 2
- 230000009194 climbing Effects 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 13
- 239000003546 flue gas Substances 0.000 description 13
- 238000005516 engineering process Methods 0.000 description 11
- 238000005507 spraying Methods 0.000 description 11
- 239000002956 ash Substances 0.000 description 8
- 230000005684 electric field Effects 0.000 description 6
- 150000002500 ions Chemical class 0.000 description 6
- 239000003638 chemical reducing agent Substances 0.000 description 5
- 238000006477 desulfuration reaction Methods 0.000 description 5
- 230000023556 desulfurization Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 230000007935 neutral effect Effects 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 4
- 239000012716 precipitator Substances 0.000 description 4
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000003245 coal Substances 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- 239000010882 bottom ash Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000003595 mist Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000443 aerosol Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000009193 crawling Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000011152 fibreglass Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
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- 238000012546 transfer Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/02—Plant or installations having external electricity supply
- B03C3/16—Plant or installations having external electricity supply wet type
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/36—Controlling flow of gases or vapour
- B03C3/361—Controlling flow of gases or vapour by static mechanical means, e.g. deflector
- B03C3/363—Controlling flow of gases or vapour by static mechanical means, e.g. deflector located before the filter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/40—Electrode constructions
- B03C3/45—Collecting-electrodes
- B03C3/49—Collecting-electrodes tubular
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/74—Cleaning the electrodes
- B03C3/78—Cleaning the electrodes by washing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION 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
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C3/00—Separating dispersed particles from gases or vapour, e.g. air, by electrostatic effect
- B03C3/34—Constructional details or accessories or operation thereof
- B03C3/86—Electrode-carrying means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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- Electrostatic Separation (AREA)
Abstract
本发明公开了一种燃煤电厂超低排放除尘器，导流板、橡胶补偿套、气流分布板、限位器，所述限位器为柱状，支架下部的壳体内安装有矩形限位框，限位器安装在限位框上，且固定阴极线下端，将阴极线绷直；节水冲洗组件，每个阳极管对应一个喷嘴，喷嘴位于阳极管顶口中心，喷淋水呈喇叭状喷射，喷淋角度为60—90度；风压传感器，有多组，在极管组内均匀分布，当压差超过指定值气动节水冲洗组件；半分板，每个半分板包括三块等长的三段玻璃钢板，两个半分板组成一个阳极管，三段一体成型，两端的两段对称，且与中间段呈120度，夹角处设置有插扣，本发明提高处理效率，降低风阻，减小驱动风机能耗；降低阳极管制造成本低，运输方便，节省大量水资源。
The invention discloses an ultra-low emission dust collector for a coal-fired power plant, a deflector, a rubber compensation sleeve, an airflow distribution plate, and a limiter. , the limiter is installed on the limit frame, and the lower end of the cathode line is fixed to straighten the cathode line; the water-saving flushing component, each anode tube corresponds to a nozzle, the nozzle is located in the center of the top port of the anode tube, and the spray water is trumpet-shaped Spray, the spray angle is 60-90 degrees; there are multiple groups of wind pressure sensors, which are evenly distributed in the pole tube group, when the pressure difference exceeds the specified value, pneumatic water-saving flushing components; half-board, each half-board includes three pieces, etc. A long three-section glass steel plate, two half-plates form an anode tube, the three sections are integrally formed, the two sections at both ends are symmetrical, and are at 120 degrees to the middle section, and a buckle is arranged at the angle. Wind resistance, reducing the energy consumption of the driving fan; reducing the anode tube manufacturing cost, low cost, convenient transportation, and saving a lot of water resources.
Description
Technical Field
The invention belongs to the field of dust collectors, and particularly relates to an ultra-low emission dust collector for a coal-fired power plant.
Background
Along with the requirement of environmental protection policy, ultralow emission is imperative, and the single and low-efficiency desulfurization, denitration and dust removal devices of coal-fired power plants and coal-fired industrial boilers cannot meet the emission requirement. The research and development of the technology for efficiently and synergistically removing the multiple pollutants, which is suitable for the national conditions of China, has the advantages of low investment, low operating cost, high efficiency and comprehensive utilization of byproduct resources, are increasingly demanded by the market and industry. The ultra-low emission technology mainly comprises a boiler low-nitrogen combustion technology, a low-temperature dust removal technology, an SCR denitration technology, a plasma denitration and oxidation denitration technology, deep wet desulphurization and dust removal. Through the organic integration of equipment function optimization and system collaborative optimization, the efficient collaborative ultralow emission of multiple pollutants is realized according to local conditions and furnace conditions. The ultra-low emission is a synergistic ultra-low emission technology taking a low-temperature dust removal technology as a core. Through the low-temperature heat exchanger, the specific resistance is reduced, the breakdown voltage of electric precipitation is improved, the amount of flue gas is reduced, most of SO3 in the flue gas is removed, the synergistic dedusting effect of WFGD is improved, the desulfurization make-up water is reduced, the electric precipitator is suitable for the transformation of the existing electric precipitator, the energy conservation and the environmental protection are organically combined, the dust emission concentration is less than or equal to 20mg/Nm3, and the sulfur trioxide removal rate reaches 90%; and a synergistic ultralow emission technology taking a deep wet desulphurization and dust removal technology as a core. Improve FGD desulphurization unit structure, adopt and hold liquid tray and high-efficient defroster technique, optimize the arrangement that sprays the layer, adopt high-efficient nozzle, reduce the liquid drop particle diameter, increase gas-liquid area of contact, strengthen the biphase mass transfer, when improving desulfurization efficiency, improve the secondary dust collection efficiency of absorption tower in coordination. An integrated ultra-low emission technology for wet desulfurization and denitration of an industrial boiler taking an oxidation method as a core. The oxidation denitration method has the characteristics of high denitration rate, suitability for denitration at the temperature lower than 250 ℃, simple and convenient installation, certain removal capacity on heavy metal mercury in flue gas, suitability for low-temperature denitration and the like.
The fine particles carried in the residual and escaping droplets in the flue gas after denitration, dust removal and desulfurization have received much attention. The fine dust and aerosol are effectively collected, the emission concentration of particulate matters is less than or equal to 5mg/Nm3, so that the requirement of ultra-low emission is met, energy is saved as far as possible, and the problem to be solved is solved urgently.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the ultra-low emission dust remover for the coal-fired power plant, which adopts the honeycomb wet-type electric precipitation principle, effectively improves the air inlet mode and the air outlet mode, avoids the uneven electric field caused by the swinging of a cathode tube, and effectively saves water and electric resources.
The invention adopts the following technical scheme: a coal fired power plant ultra low emission dust remover comprising:
the support comprises a plurality of groups of vertical rods and cross braces, a multilayer structure is formed, each layer is provided with a pedestrian passageway, and each layer is arranged up and down through the crawling ladder; the middle part of the bracket is provided with a shell,
an air inlet arranged at the top of the bracket and connected with the smoke inlet pipeline through a reducer pipe, a top bracket arranged at the upper part of the bracket supports the smoke inlet pipeline and the reducer pipe,
the cathode wire group is positioned in the shell of the bracket and comprises cathode wires and anode tubes, each cathode wire corresponds to one anode tube, the upper part of each cathode wire is connected with a corona electrode, the corona electrode is positioned at the top of the bracket, an insulating cylinder is sleeved outside the corona electrode, the drying fan is connected with a plurality of shunt tubes, the shunt tubes heat and dry the corona electrode, the anode tubes of the drying fan are a plurality of and spliced into a honeycomb shape, and airflow enters and exits from the anode tubes,
the ash bucket is positioned below the polar tube group and is conical, the lower part of the ash bucket is connected with the sewage discharge pipe,
an air outlet pipe which is arranged on the side surface of the bottom ash hopper,
further comprising:
the guide plates are obliquely arranged between the air inlet and the pole tube group,
the rubber compensation sleeve is cylindrical and is arranged between the two pipe joints of the air outlet pipe, the width of the rubber compensation sleeve exceeds the sum of the deformation of the pipe joints and the two minimum sleeving lengths,
the air flow distribution plate is provided with a plurality of arc-shaped air flow distribution plates, the deflection angle is 90 degrees, the air flow distribution plates extend from the bottom of the pole tube group to the air outlet pipe,
the stopper is columnar, a rectangular limiting frame is arranged in the shell at the lower part of the bracket, the stopper is arranged on the limiting frame and fixes the lower end of the cathode wire to straighten the cathode wire,
the water-saving flushing component is arranged below the air inlet and above the pole tube group, and comprises a stop valve, a pressure changer, a three-way valve and a branch pipe, wherein high-pressure water is connected into the main pipe through the stop valve, and the main pipe is provided with a duck edge device, a pressure gauge and a ball valve; the main pipe is connected with each branch pipe through a three-way valve, the branch pipes are arranged according to the anode pipe structure of the anode pipe group, the nozzles are communicated with the branch pipes, each anode pipe corresponds to one nozzle, the nozzles are positioned at the center of the top opening of the anode pipe, spray water is sprayed in a horn shape, the spraying angle is 60-90 degrees,
the wind pressure sensors are provided with a plurality of groups which are uniformly distributed in the polar tube group, each group comprises two wind pressure sensors which are respectively positioned at the upper end and the lower end of the anode tube, when the pressure difference exceeds a specified value, the pneumatic water-saving flushing component,
half-divided plates, each half-divided plate comprises three equal-length three sections of glass steel plates, two half-divided plates form an anode tube, the three sections are integrally formed, two sections at two ends are symmetrical and form 120 degrees with the middle section, a plug-in buckle is arranged at an included angle and is divided into a male opening and a female buckle, the male buckle can be spliced with other anode tubes through plug-in connection, fixing frames at two ends are plugged in the anode tubes,
furthermore, in order to facilitate maintenance, a discharge opening at the bottom of the ash bucket is positioned on one side of the air outlet pipe, the blow-off pipe is provided with a backflushing high-pressure spray head, and a blow-off ditch is excavated below the blow-off pipe.
Further, the cathode wire is a titanium alloy rigid barbed wire.
Furthermore, an electric ball valve is arranged on a branch pipe of each water-saving flushing component.
The working principle of the invention is as follows:
the main body part of the invention consists of a precipitation electrode comprising a cathode wire and an anode tube, smoke dust and fog drops in the smoke are charged by the smoke through a high-voltage electric field to form charged ions, the charged ions move to an electrode with opposite charges, the charged ions discharge after reaching the electrode to form neutral dust and fog particles, the neutral dust and the fog particles are deposited on the electrode to be condensed, and the captured dust is washed into an ash bucket through a flowing water film and is discharged along with water.
When flue gas gets into the utmost point nest of tubes, if the flue gas distributes inhomogeneously, can cause the flue gas volume of the intraductal entering of positive pole different, cause the treatment effeciency to reduce, and set up the deflector group in air intake department, can make the flue gas evenly get into the utmost point nest of tubes.
The air outlet pipe is replaced along with seasons, the expansion and contraction phenomenon can occur, the stress can lead to the breakage of the air outlet pipe, and the rubber compensation sleeve is arranged, so that the condition can be effectively avoided. Meanwhile, the air outlet pipe is provided with the air flow distribution plate, so that the generation of vortex can be avoided, the wind resistance is reduced, and the energy consumption of the driving fan is reduced.
When the dust collector is used for a long time, dust is adhered in the anode tube, regular spraying is adopted at present, and for a 30 ten thousand kilowatt unit, the water consumption is 5-10 tons/day; for 60 ten thousand kilowatt units, the water consumption is 9-15 tons/day; for a 100 ten thousand kilowatt unit, the water consumption is 14-22 tons/day. In order to save water resources, two wind pressure sensors are arranged at two ends of the anode tube, and if the wind pressure difference value is lower than a set value, the water-saving flushing assembly is started. Meanwhile, the existing spraying mode is adopted, each nozzle is responsible for cleaning a plurality of anode tubes, the wall of each anode tube only occupies a small part of the spraying area, a large amount of water resource falls from the middle of each anode tube, the wall of each anode tube cannot be flushed in all directions, and waste is serious. According to the invention, by arranging the small simple conical nozzle, each anode tube is provided with one nozzle according to the Venturi effect, and the formed water mist is conical and mainly concentrated on the tube wall of the anode tube. According to the experimental measurement, the flushing effect of the prior art can be achieved only by about 25% of the original water quantity.
The structure of the current anode tube is mainly hexagonal, and comprises an integral structure and a split structure, wherein the integral structure is formed by folding plates into a hexagonal shape and then locking the plates, and the split structure comprises six plates which need to be assembled. The monolithic structure is inconvenient to transport and install, while the split structure is time consuming to assemble. According to the invention, through the creative half-split plate structure, the plates are simply folded and connected through the inserting buckles, and the upper part and the lower part of the plates are fixed with the end plates, so that the manufacturing cost is low, the plates can be stacked and transported, and the occupied space is small.
The invention has the beneficial effects that:
1. the ultra-low emission dust remover of the coal-fired power plant does not need to continuously spray alkaline water during operation, collects fog drops in flue gas by virtue of an electric field area, and forms overflow in the anode tube bundle to achieve the aim of automatically flowing to remove dust;
2. the air inlet of the invention is provided with the guide plate group, and the air outlet pipe is provided with the air flow distribution plate, thus improving the treatment efficiency, reducing the wind resistance and reducing the energy consumption of the driving fan;
3. the invention adopts a half-split plate mode of assembling two by two, has simple processing and assembly, low manufacturing cost and convenient transportation;
4. the bottom of each cathode wire is provided with the limiter, and the limiter is arranged on the limiting frame, so that the cathode wires are prevented from swinging under the action of airflow, and the uniformity of an electric field is improved;
5. according to the invention, the simple micro-nozzle is arranged above each anode tube, water flow is concentrated on the wall of the anode tube, a large amount of water resources are saved, and meanwhile, spraying is started when more dust is attached to the anode tube through the wind pressure sensor, so that the problems of untimely and waste of timing spraying are avoided.
Drawings
FIG. 1 is a schematic front view of an ultra-low emission precipitator for a coal-fired power plant according to the present invention;
FIG. 2 is a schematic top view of an ultra low emission precipitator for a coal fired power plant according to the present invention;
FIG. 3 is a schematic view showing the connection of the water saving flush assembly of the ultra low emission dust collector of the coal fired power plant according to the present invention;
FIG. 4 is a schematic layout of the cathode lines of the ultra-low emission dust collector of the coal-fired power plant according to the present invention;
FIG. 5 is an enlarged schematic view of portion A of FIG. 4;
FIG. 6 is a schematic layout view of the pole tube group of the ultra-low emission dust collector of the coal-fired power plant according to the present invention;
FIG. 7 is an enlarged schematic view of the anode tube of the ultra-low emission dust collector of the coal-fired power plant according to the present invention;
FIG. 8 is an enlarged schematic view of a half-divided plate of the anode tube of the ultra-low emission dust collector of the coal-fired power plant according to the present invention.
In the figure: 1. the device comprises a bracket, 2, a sewage discharge pipe, 3, an air outlet pipe, 4, an air flow distribution plate, 5, a rubber compensation sleeve, 6, an electrode pipe group, 7, a ladder, 8, a water-saving flushing component, 801, a stop valve, 802, a pressure changer, 803, a three-way valve, 804, a branch pipe, 805, a nozzle, 9, a corona electrode, 10, an air inlet, 11, an air inlet pipe, 12, a top support frame, 13, a drying fan, 14, a shunt pipe, 15, a reducer pipe, 16, a guide plate group, 17, an anode pipe, 1701, a half-section plate, 1702, a plug-in buckle, 18, a cathode wire, 19, a limiting frame, 20, a limiting stopper, 21, a fixing frame, 22, an insulating cylinder, 23 and an air pressure sensor.
Detailed Description
The details of the present invention are described below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a coal-fired power plant ultra-low emission dust collector includes:
the support 1 comprises a plurality of groups of vertical rods and cross braces, a multilayer structure is formed, each layer is provided with a pedestrian passageway, and each layer is arranged up and down through a ladder stand 7; the middle part of the bracket 1 is a shell,
an air inlet arranged at the top of the bracket 1 and connected with the smoke inlet pipeline 11 through a reducer pipe 15, a top bracket 12 arranged at the upper part of the bracket 1 for supporting the smoke inlet pipeline 11 and the reducer pipe 15,
the cathode tube group 6 is positioned in the shell of the bracket 1 and comprises cathode wires 18 and anode tubes 17, each cathode wire 18 corresponds to one anode tube 17, the upper part of each cathode wire 18 is connected with a corona electrode 9,
as shown in fig. 2, the corona electrode 9 is located at the top of the bracket 1, the insulating cylinder 22 is sleeved outside the corona electrode 9, the drying fan 13 is connected with a plurality of shunt tubes 14, the shunt tubes 14 heat and dry the corona electrode 9, a plurality of anode tubes 17 of the drying fan 13 are spliced into a honeycomb shape, the air flow enters and exits from the anode tubes 17,
the ash bucket is positioned below the polar tube group 6 and is conical, the lower part of the ash bucket is connected with the sewage discharge pipe 2,
an air outlet pipe 3 is arranged on the side surface of the bottom ash hopper,
further comprising:
the guide plates are provided with a plurality of blocks which are obliquely arranged between the air inlet 10 and the pole tube group 6,
the rubber compensation sleeve 5 is cylindrical, is arranged between the two pipe joints of the air outlet pipe 3, has the width exceeding the sum of the deformation of the pipe joints and the two minimum sleeving lengths,
the air flow distribution plate 4 is provided with a plurality of arc-shaped air flow distribution plates, the deflection angle is 90 degrees, the air flow distribution plates extend from the bottom of the pole tube group 6 to the air outlet pipe 3,
as shown in fig. 4 and 5, the stopper 20 is columnar, a rectangular stopper frame 19 is installed in the casing at the lower part of the support 1, the stopper 20 is installed on the stopper frame 19 and fixes the lower end of the cathode wire 18 to straighten the cathode wire 18,
as shown in fig. 3, the water-saving flushing component 8 is installed below the air inlet and above the polar tube group 6, the water-saving flushing component 8 includes a stop valve 801, a pressure transformer 802, a three-way valve 803, and a branch pipe 804, the high-pressure water is connected to the main pipe through the stop valve 801, and the main pipe is provided with a duck-side device, a pressure gauge and a ball valve; the main pipe is connected with each branch pipe 804 through a three-way valve 803, the branch pipes 804 are arranged according to the structure of the anode pipes 17 of the anode pipe group 6, the nozzles 805 are communicated with the branch pipes 804, each anode pipe 17 corresponds to one nozzle 805, the nozzle 805 is positioned at the center of the top opening of the anode pipe 17, spray water is sprayed in a trumpet shape, the spraying angle is 60-90 degrees,
as shown in fig. 6, there are several groups of wind pressure sensors 23, which are uniformly distributed in the pole tube group 6, each group includes two wind pressure sensors 23, which are respectively located at the upper end and the lower end of the anode tube 17, when the pressure difference exceeds the designated value, the pneumatic water-saving flushing assembly 8,
as shown in fig. 7 and 8, each half-divided plate 1701 comprises three equal-length three sections of glass fiber reinforced plastic plates, the two half-divided plates 1701 form an anode tube 17, the three sections are integrally formed, two sections at two ends are symmetrical and form an angle of 120 degrees with the middle section, a plug-in buckle 1702 is arranged at an included angle, the plug-in buckle 1702 is divided into a male opening and a female buckle and can be spliced with other anode tubes 17 by plugging, fixing frames 21 at two ends are plugged on the anode tubes 17,
in practical application, in order to facilitate maintenance, the discharge opening at the bottom of the ash bucket is positioned on one side of the air outlet pipe 3, the blow-off pipe 2 is provided with a backflushing high-pressure spray head, and a blow-off ditch is excavated below the blow-off pipe 2.
In practical application, the cathode line 18 is a titanium alloy rigid barbed wire.
In practical application, an electric ball valve is mounted on the branch pipe 804 of each water-saving flushing assembly 8.
The working principle of the invention is as follows:
the main body part of the invention is composed of a precipitation electrode comprising a cathode wire 18 and an anode tube 17, smoke dust and fog drops in the smoke are charged by the smoke through a high-voltage electric field, charged ions are formed, the charged ions move to an electrode with opposite charges, the charged ions discharge after reaching the electrode, neutral dust and fog particles are formed, the neutral dust and fog particles are deposited on the electrode to be condensed, and the captured dust is washed into an ash bucket through a flowing water film and is discharged along with water.
When the flue gas enters the electrode tube group 6, if the flue gas is not uniformly distributed, the amount of the flue gas entering the anode tube 17 is different, and the treatment efficiency is reduced, and the guide plate group 16 is arranged at the air inlet 10, so that the flue gas can uniformly enter the electrode tube group 6.
The air outlet pipe 3 is replaced along with seasons, the expansion and contraction phenomenon can occur, the stress can lead to the air outlet pipe 3 to be broken, and the rubber compensation sleeve 5 is arranged, so that the condition can be effectively avoided. Meanwhile, the air outlet pipe 3 is provided with the air flow distribution plate 4, so that the generation of vortex can be avoided, the wind resistance is reduced, and the energy consumption of a driving fan is reduced.
When the dust collector is used for a long time, dust is adhered in the anode tube 17, regular spraying is adopted at present, and for a 30 ten thousand kilowatt unit, the water consumption is 5-10 tons/day; for 60 ten thousand kilowatt units, the water consumption is 9-15 tons/day; for a 100 ten thousand kilowatt unit, the water consumption is 14-22 tons/day. In order to save water resources, two wind pressure sensors 23 are arranged at two ends of the anode tube 17, and if the wind pressure difference value is lower than a set value, the water-saving flushing component 8 is started. Meanwhile, the existing spraying mode is adopted, each nozzle 805 is responsible for cleaning a plurality of anode tubes 17, the wall of each anode tube 17 only occupies a very small part of the spraying area, a large amount of water resource falls from the middle of each anode tube 17, the wall of each anode tube 17 cannot be flushed in all directions, and waste is serious. According to the invention, by arranging the small simple conical nozzle 805, one nozzle 805 is distributed to each anode tube 17 according to the Venturi effect, and the formed water mist is conical and mainly concentrated on the tube wall of each anode tube 17. According to the experimental measurement, the flushing effect of the prior art can be achieved only by about 25% of the original water quantity.
The current anode tube 17 structure is mainly hexagonal, and comprises an integral structure and a split structure, wherein the integral structure is formed by folding plates into a hexagonal shape and then locking the hexagonal plate, and the split structure comprises six plates which need to be assembled. The monolithic structure is inconvenient to transport and install, while the split structure is time consuming to assemble. The invention simply turns the plate to be connected through the inserting buckle 1702 and fixes the plate with the end plate up and down through the creative structure of the half-divided plate 1701, has low manufacturing cost, can be stacked and transported, and occupies small space.
In practical applications, the center-to-center distance of the filter bags 11 is 1.25 times the diameter of the filter bags 11.
In conclusion, the invention improves the treatment efficiency, reduces the wind resistance and reduces the energy consumption of the driving fan; the anode tube has the advantages of reducing the manufacturing cost of the anode tube, being convenient to transport, improving the uniformity of an electric field, saving a large amount of water resources and avoiding the problems of untimely and waste of timing spraying.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. The directional indicators such as front, back, left, right, end, front, etc. are only used for describing the structure, but not for limitation. It should be understood by those skilled in the art that the foregoing embodiments are merely illustrative of the technical spirit and features of the present invention, and the present invention is not limited thereto but may be implemented by those skilled in the art.
Claims (4)
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