CN112108269A - Pulse charge wet-type electric precipitation demister, treatment method and application thereof - Google Patents
Pulse charge wet-type electric precipitation demister, treatment method and application thereof Download PDFInfo
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- CN112108269A CN112108269A CN201910529036.1A CN201910529036A CN112108269A CN 112108269 A CN112108269 A CN 112108269A CN 201910529036 A CN201910529036 A CN 201910529036A CN 112108269 A CN112108269 A CN 112108269A
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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
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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
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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
- B03C3/41—Ionising-electrodes
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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
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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
- B03C3/66—Applications of electricity supply techniques
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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
- B03C3/74—Cleaning the electrodes
- B03C3/78—Cleaning the electrodes by washing
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Abstract
The invention discloses a pulse charged wet-type electric precipitation demister, a treatment method and application thereof, and relates to the technical field of flue gas treatment. The problems that a traditional dust removal demister is prone to cathode wire breakage, unstable in voltage, low in efficiency and reliability and the like are solved. The device comprises a shell, wherein a flue gas inlet is formed in the bottom of the shell, a flue gas outlet is formed in the top of the shell, a washing mechanism is arranged in the shell at the flue gas outlet, and a distribution filler is arranged in the shell close to the flue gas inlet and used for uniformly distributing flue gas to be treated; a pulse discharge electrode group and a pulse power supply are arranged above the distributed filler, the pulse power supply provides pulse high voltage and generates corona discharge between the positive electrode and the negative electrode of the pulse discharge electrode group, and a deflection electric field area is arranged above the pulse discharge electrode group. The dust and mist eliminator solves the problems of easy breakage of a cathode wire, unstable voltage, low efficiency and reliability and the like by changing the traditional electrode form, and prolongs the service life of equipment.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a pulse charged wet-type electric precipitation demister suitable for flue gas treatment in industries such as petroleum, chemical engineering, smelting and the like.
Background
The wet electric dust collector and demister can remove harmful substances such as dust, acid mist, water drops, aerosol, odor, PM2.5 and the like in moisture-containing gas, and is ideal equipment for treating atmospheric dust pollution. Along with the improvement of the environmental protection requirement, the electric precipitation demisting device is popularized and applied. The wet electric dedusting and demisting process includes: corona discharge of electrode, charging of particles, movement under the action of electric field, collection of dust collecting electrode and flushing.
Researchers have carried out continuous improvement to wet-type electrostatic precipitator defroster among the prior art, and main relevant research has:
application number 201410633638.9 provides a wet-type electrostatic precipitator, realizes that electrostatic precipitation combines together with wet dedusting through setting up adsorption plate and wet dedusting cavity to set up the adsorption plate into zigzag shape with the area of contact who improves gas and adsorption plate, improved dust collection efficiency.
Application number 201510893320.9 provides a wet-type electrostatic precipitator, and it has mainly add plate-type anode system in the below of original tubular anode system, and extension electric field length makes the dwell time of flue gas in the electric field longer, and then improves dust collection efficiency.
Application No. 201610439156.9 provides an automatic centrifugal wet electrostatic precipitator, which effectively combines a centrifugal precipitation method and a wet electrostatic precipitation method to improve the precipitation efficiency.
Application No. 201710335900.5 provides a wet-type electrostatic precipitator, mainly through setting up vortex shape air current passageway, increase the area of contact with the negative pole line when reducing the gas velocity.
Application number 201711480635.6 provides an electric dust collector, mainly sets up and sprays mechanism, honeycomb dust removal mechanism and secondary wiper mechanism, realizes cleaing away to a small amount of neutral dust and the fog granule of honeycomb holes internal surface adnexed.
Application number 201721258453.X provides a wet-type electric precipitator, which is mainly characterized in that a multilayer demister is arranged at an outlet to collect droplets with different particle diameters in a layering manner.
However, although the research on the dust and mist eliminator in the related research has made certain progress, the current wet electrostatic precipitator still has some disadvantages:
first, long-period operation reliability is insufficient. For example: the cathode wire is broken to cause local ignition and cause unstable voltage and even local breakdown; second, the traditional wire-shaped electrode and rod-shaped electrode have uneven discharge; thirdly, the corona ionization and the deflection electric field supply power for the same time, and in the same space, the discharge and the deflection have mutual interference; fourthly, the traditional electrode is generally longer, about 4m, high in installation concentricity requirement and easy to generate electric field unevenness and partial discharge; fifthly, for a strong corrosion environment, the requirement on corrosion resistance of the electrode wire material is high, and the cost is high. Meanwhile, the influence of the electric dust removal equipment on the corrosion of the tower body equipment connected with the lower part is not considered. With the pursuit of people for environmental protection, the operation of environmental protection equipment is related to the operation of a main device and becomes a short plate of a long period of the device, so that a dust and mist removing device capable of stably operating for a long period is urgently needed.
Disclosure of Invention
The invention aims to provide a pulse charged wet-type electric precipitation demister, a treatment method and application thereof, which solve the problems of easy occurrence of sparks and unstable voltage and prolong the service life of equipment by changing the traditional electrode form.
In order to achieve the purpose, the main technical problem to be overcome by the invention is how to set a charge part and a deflection electric field, solve the technical problem of low efficiency and reliability, and meet the requirement of long-period stable operation.
In order to solve the technical problem, one of the tasks of the invention is to provide a pulse charged wet-type electric precipitation demister, which adopts the following technical scheme:
the utility model provides a pulse lotus electric wet-type electrostatic precipitator defroster, its includes the casing, the casing have flue gas entry end and flue gas exit end, be provided with the distribution filler in the casing inside near the flue gas entry, the distribution filler be used for with pending flue gas distribution even.
In a preferred embodiment of the present invention, a pulse discharge electrode group and a pulse power supply are disposed above the distribution packing, and the pulse power supply supplies a pulse high voltage and generates corona discharge between the positive electrode and the negative electrode of the pulse discharge electrode group.
As another preferred embodiment of the present invention, a deflection electric field area is disposed above the pulse discharge electrode set, the deflection electric field area includes a dust removal anode tube and a dust removal cathode, and the deflection electric field area is supplied with voltage by a dc power supply.
Furthermore, the device also comprises a flushing mechanism which is positioned above the deflecting electric field area.
Preferably, the flue gas inlet end is located at the bottom of the shell, the flue gas outlet end is located at the top of the shell, and flue gas to be treated enters through the flue gas inlet end and is discharged from the flue gas outlet end.
Further preferably, an inner cofferdam and a condensate discharge port for collecting and discharging corrosive condensate are arranged on the shell near the flue gas inlet end.
Preferably, the flushing mechanism comprises a nozzle and a flushing water pipeline, the flushing water pipeline provides a water source for the nozzle, and the nozzles are distributed right above the deflection electrode group and are provided with a plurality of nozzles.
Further, the top of casing be round platform form, the bottom of casing is inverted circular platform form, the middle part of casing is cylindricly.
Furthermore, the voltage of the pulse power supply is 1000-50000 volts, and the voltage of the direct current power supply is 1000-50000 volts.
Furthermore, a shielding metal plate is arranged on the wall of the inverted circular truncated cone at the bottom of the shell.
Furthermore, the distance between the pulse discharge electrodes in the pulse discharge electrode group is 10-60 mm, and the pulse discharge electrodes are provided with protrusions with the diameter of 1-20 mm.
Preferably, the dedusting anode tube is circular or polygonal, and the length of the dedusting anode tube is 1000-8000 mm.
Preferably, the interior of the dedusting cathode tube is hollow, the outer diameter of the dedusting cathode tube is 10-30 mm, and the wall thickness of the dedusting cathode tube is 0.5-4 mm.
The invention also provides a treatment method of the pulse charged wet-type electric precipitation demister, which comprises the following steps:
a. the flue gas enters from a flue gas inlet end, is uniformly distributed by the distribution filler and then enters the pulse discharge electrode group;
b. providing pulse high voltage by a high-voltage pulse power supply, generating corona discharge between a positive electrode and a negative electrode, namely a pulse discharge anode plate and a pulse discharge cathode plate, allowing liquid drops or particles in air flow to enter a dust removal anode tube along with the air flow after the electrode gap is charged, providing voltage by a direct-current high-voltage power supply, forming an electric field between a cathode and an anode, and deflecting the charged particles under the action of the electric field;
c. the dust removal cathode tube and the dust removal anode tube are attached, and the flue gas after dust removal is discharged through a flue gas outlet.
It is further preferred that step c is followed by intermittently rinsing the surfaces of the dust-removing cathode and anode with rinsing water.
Preferably, the washing water is intermittently sprayed out from the spray head group at the upper parts of the washing pipeline and the dust removal pipe, liquid drops on the wall of the washing pipeline are intercepted and collected by the inner weir and then discharged by the condensate discharge port, and an electric field at the upper part is shielded by the external shielding metal plate.
The invention also provides application of the pulse charged wet-type electric precipitation demister in flue gas treatment of petroleum, chemical engineering and smelting devices.
Compared with the prior art, the invention has the following beneficial technical effects:
(1) the discharge and deflection electric fields of the invention are independent and have no mutual influence. The discharge part adopts pulse discharge, and has high corona strength, high charge efficiency and low energy consumption. The plate-type discharge electrode is adopted, so that the problem that the traditional cathode linear electrode is easy to fatigue fracture is solved. The pole plates are provided with the densely distributed convex parts which are used as the discharge tips and are used for disturbing the gas flowing between the pole plates so as to enhance the charge effect. The deflection electric field is independent, does not need high-voltage discharge, and the interval between the negative pole and the positive pole reduces moreover, and this makes required voltage greatly reduced, and voltage is steady easily to be controlled, is difficult for taking place spark or local breakdown. On the other hand, the distance from the charged particles to the dust collecting electrode is greatly reduced, and the improvement of the dust removal efficiency is facilitated. Near the flue gas entry of casing sets up interior cofferdam and row and congeals the mouth, realizes the collection and the timely discharge of strong corrosive condensate, alleviates the corruption to lower part equipment. And a metal shielding plate is arranged outside the wall of the lower part of the shell, so that the influence of an upper electric field on lower metal equipment is reduced.
(2) The demister disclosed by the invention has the advantages of high charging efficiency, low energy consumption, high adaptability and stable voltage, reduces corrosion of lower equipment and meets the requirement of long-period (4 years) operation.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural diagram of a pulse charged wet-type electric precipitation demister according to the present invention;
FIG. 2 is a top view of the dust removal anode tube of the present invention;
FIG. 3 is a schematic diagram of a pulsed discharge electrode assembly according to the present invention;
in the figure, 1, a flue gas inlet, 2, a distributed filler, 3, a pulse discharge electrode group, 4, a dust removal cathode tube, 5, a dust removal anode tube, 6, a flue gas outlet, 7, a flushing water pipeline, 8, a nozzle, 9, a direct current high-voltage power supply, 10, a high-voltage pulse power supply, 11, an inner weir, 12, a condensate discharge port, 13, an external shielding metal plate, 14, a shell, 15, a pulse discharge anode plate, 16 and a pulse discharge cathode plate.
Detailed Description
The invention provides a pulse charged wet-type electric precipitation demister, a treatment method and application thereof, and the invention is described in detail below with reference to specific embodiments in order to make the advantages and technical scheme of the invention clearer and clearer.
As shown in fig. 1, the pulse charge wet-type electric precipitation demister of the present invention includes a housing 14 and a dust removal mechanism located in the housing 14, and as a main improvement point of the present invention, a pulse charge mode is adopted in a charge part, so that the charge efficiency is high. And a plate electrode is adopted, so that the problem of cathode line fracture is structurally avoided. The second main improvement point is that the pulse charge discharge and the deflection electric field are mutually independent, and the voltage of the deflection electric field is greatly reduced. As shown in the combined figure 2, the deflection electric field area comprises a dust removal anode tube 5 and a dust removal cathode tube 4, the deflection electric field area provides voltage through a direct current high-voltage power supply 9, the deflection electric field part does not need to discharge, the electric field requirement can be met by adjusting the electrode spacing, the high-voltage requirement is reduced, the voltage and the electric field are stable, and sparks or local breakdown is not easy to occur. The dust collecting pole does not need prickles or fins, thereby reducing the adhesion of dust and dirt, being convenient for cleaning and reducing the manufacturing cost. The reduction of the electrode distance reduces the distance from charged liquid drops/particles to a dust collecting electrode, improves the efficiency and reduces the energy consumption. By changing the traditional electrode form, the problem of low efficiency and reliability is solved, and the service life of the equipment is prolonged. The dedusting anode tube in the deflecting electric field area can be round, square or other polygons, and is preferably round. The diameter is 20-400 mm, preferably 30-60 mm. The length of the dust removal anode tube is 1000-8000 mm.
The dust removal cathode can be selected from hollow and solid, the outer diameter of the hollow tube is 10-30 mm, and the wall thickness is 0.5-4 mm. The diameter of the solid cathode tube is 2-15 mm.
The inside of the shell close to the flue gas inlet is provided with a distribution filler 2 which is used for uniformly distributing the flue gas to be treated;
below the deflection electric field area are a pulse discharge electrode group 3 and a high voltage pulse power supply 10, which provides a pulse high voltage, and as shown in fig. 3, the pulse discharge electrode group generates corona discharge between the positive and negative electrodes. The discharge part adopts pulse discharge, and has high corona strength, high charge efficiency and low energy consumption. The plate-type discharge electrode is adopted, so that the problem that the traditional cathode wire is easy to fatigue fracture is solved. The pole plates are provided with the densely distributed convex parts which are used as the discharge tips and are used for disturbing the gas flowing between the pole plates so as to enhance the charge effect.
The structure of the shell is preferably circular truncated cone-shaped and inverted circular truncated cone-shaped from top to bottom, the middle of the shell is cylindrical, the bottom of the shell is provided with a flue gas inlet 1, the top of the shell is provided with a flue gas outlet 6, flue gas to be treated enters from the flue gas inlet 1 and is discharged from the flue gas outlet 6 after being treated, an inner cofferdam 11 and a condensate discharge port 12 are arranged on the shell near the flue gas inlet 1, liquid drops on the shell wall are intercepted and collected by an inner cofferdam 11 and then are discharged by the condensate discharge port 12, and the corrosion to other equipment on the lower part is reduced. An external shielding metal plate 13 is arranged under the shell to shield the electric field at the upper part and reduce the influence on other equipment at the lower part.
The flushing mechanism comprises a nozzle 8 and a flushing water pipeline 7, wherein the flushing water pipeline provides water sources for the nozzle, and the nozzles are distributed right above the deflection electrode group and are provided with a plurality of nozzles.
Example 1:
3-5 nozzles are arranged.
The flue gas is treated by the pulse charged wet-type electric precipitation demister, and the specific treatment steps are as follows:
flue gas enters from a flue gas inlet 1, enters a pulse discharge electrode group 3 after being uniformly distributed through a distribution filler 2, a high-voltage pulse power supply 10 provides pulse high voltage, corona discharge is generated between a positive electrode and a negative electrode, namely a pulse discharge anode plate 15 and a pulse discharge cathode plate 16, liquid drops or particles in the air flow enter a dust removal anode tube along with the air flow after being charged in an electrode gap, a direct current high-voltage power supply 9 provides voltage, an electric field is formed between a cathode and an anode, the charged particles are deflected under the action of the electric field, the charged particles are attached to the dust removal cathode tube 4 and the dust removal anode tube 5, and the flue gas after dust removal exits the equipment through a. The washing water is intermittently sprayed from the washing pipeline 7 and the nozzle group at the upper part of the dust removing pipe to clean the surfaces of the dust removing cathode and the dust removing anode and remove attached particles and liquid drops. The liquid drops on the wall of the device are intercepted and collected by the inner weir 11 and then discharged out of the device through the condensate discharge port 12, and the outer shielding metal plate 13 below the device shields the electric field at the upper part, so that the influence on other devices at the lower part is reduced.
Selecting main parameters:
the voltage of the pulse power supply is 1000 v,
direct-current power supply voltage: the voltage of the power supply is 1000 volts,
the distance between the pulse discharge electrodes is 10mm, and the diameter of the salient point of the polar plate is 1 mm.
The dust collecting anode can be round, square or other polygon, preferably round. The diameter is 20-400 mm, preferably 30-60 mm. The length of the dust collecting anode is 1000-8000 mm.
The dust collecting cathode is hollow, the outer diameter of the hollow tube is 10-30 mm, and the wall thickness is 0.5-4 mm.
Example 2:
the flue gas is treated by the pulse charged wet-type electric precipitation demister, and the specific treatment steps are as follows:
flue gas enters from a flue gas inlet 1, enters a pulse discharge electrode group 3 after being uniformly distributed through a distribution filler 2, a high-voltage pulse power supply 10 provides pulse high voltage, corona discharge is generated between a positive electrode and a negative electrode, namely a pulse discharge anode plate 15 and a pulse discharge cathode plate 16, liquid drops or particles in the air flow enter a dust removal anode tube along with the air flow after being charged in an electrode gap, a direct current high-voltage power supply 9 provides voltage, an electric field is formed between a cathode and an anode, the charged particles are deflected under the action of the electric field, the charged particles are attached to the dust removal cathode tube 4 and the dust removal anode tube 5, and the flue gas after dust removal exits the equipment through a. The washing water is intermittently sprayed from the washing pipeline 7 and the nozzle group at the upper part of the dust removing pipe to clean the surfaces of the dust removing cathode and the dust removing anode and remove attached particles and liquid drops. The liquid drops on the wall of the device are intercepted and collected by the inner weir 11 and then discharged out of the device through the condensate discharge port 12, and the outer shielding metal plate 13 below the device shields the electric field at the upper part, so that the influence on other devices at the lower part is reduced.
Selecting main parameters:
the pulsed power supply voltage is at 50000 volts,
direct-current power supply voltage: the voltage of the power supply is 50000V,
the distance between the pulse discharge electrodes is 60mm, and the diameter of the salient point of the polar plate is 1-20 mm.
The dust collecting anode can be round, square or other polygon, preferably round. The diameter is 20-400 mm, preferably 30-60 mm. The length of the dust collecting anode is 1000-8000 mm.
The dust collecting cathode can be selected from hollow and solid, the outer diameter of the hollow tube is 30mm, and the wall thickness is 4 mm. The solid cathode has a diameter of 2 mm.
Example 3:
5-10 nozzles are arranged.
The flue gas is treated by the pulse charged wet-type electric precipitation demister, and the specific treatment steps are as follows:
flue gas enters from a flue gas inlet 1, enters a pulse discharge electrode group 3 after being uniformly distributed through a distribution filler 2, a high-voltage pulse power supply 10 provides pulse high voltage, corona discharge is generated between a positive electrode and a negative electrode, namely a pulse discharge anode plate 15 and a pulse discharge cathode plate 16, liquid drops or particles in the air flow enter a dust removal anode tube along with the air flow after being charged in an electrode gap, a direct current high-voltage power supply 9 provides voltage, an electric field is formed between a cathode and an anode, the charged particles are deflected under the action of the electric field, the charged particles are attached to the dust removal cathode tube 4 and the dust removal anode tube 5, and the flue gas after dust removal exits the equipment through a. The washing water is intermittently sprayed from the washing pipeline 7 and the nozzle group at the upper part of the dust removing pipe to clean the surfaces of the dust removing cathode and the dust removing anode and remove attached particles and liquid drops. The liquid drops on the wall of the device are intercepted and collected by the inner weir 11 and then discharged out of the device through the condensate discharge port 12, and the outer shielding metal plate 13 below the device shields the electric field at the upper part, so that the influence on other devices at the lower part is reduced.
Selecting main parameters:
the voltage of the pulse power supply is 3000V,
direct-current power supply voltage: the voltage of the liquid crystal display panel is 3000V,
the distance between the pulse discharge electrodes is 10mm, and the diameter of the salient point of the polar plate is 20 mm.
The dust collecting anode can be round, square or other polygon, preferably round. The diameter is 20-400 mm, preferably 30-60 mm. The length of the dust collecting anode is 1000-8000 mm.
The dust collecting cathode is hollow, the outer diameter of the hollow tube is 10-30 mm, and the wall thickness is 0.5 mm. The solid cathode has a diameter of 15 mm.
Example 4:
the flue gas is treated by the pulse charged wet-type electric precipitation demister, and the specific treatment steps are as follows:
flue gas enters from a flue gas inlet 1, enters a pulse discharge electrode group 3 after being uniformly distributed through a distribution filler 2, a high-voltage pulse power supply 10 provides pulse high voltage, corona discharge is generated between a positive electrode and a negative electrode, namely a pulse discharge anode plate 15 and a pulse discharge cathode plate 16, liquid drops or particles in the air flow enter a dust removal anode tube along with the air flow after being charged in an electrode gap, a direct current high-voltage power supply 9 provides voltage, an electric field is formed between a cathode and an anode, the charged particles are deflected under the action of the electric field, the charged particles are attached to the dust removal cathode tube 4 and the dust removal anode tube 5, and the flue gas after dust removal exits the equipment through a. The washing water is intermittently sprayed from the washing pipeline 7 and the nozzle group at the upper part of the dust removing pipe to clean the surfaces of the dust removing cathode and the dust removing anode and remove attached particles and liquid drops. The liquid drops on the wall of the device are intercepted and collected by the inner weir 11 and then discharged out of the device through the condensate discharge port 12, and the outer shielding metal plate 13 below the device shields the electric field at the upper part, so that the influence on other devices at the lower part is reduced.
Selecting main parameters:
the voltage of the pulse power supply is 8000 v,
direct-current power supply voltage: the voltage of the high-voltage power supply is 8000 volts,
the distance between the pulse discharge electrodes is 40mm, and the diameter of the salient point of the polar plate is 10 mm.
The dust collecting anode is square, and the length of the dust collecting anode is 1000-8000 mm.
The dust collecting cathode is solid, and the diameter of the solid cathode is 15 mm.
The invention adopts a mode that the discharge and the deflection electric field are independent, and the discharge part adopts plate-type pulse discharge, so that the discharge is uniform, the charge efficiency is high, and the energy consumption is low. The deflection part adopts a direct current power supply, the deflection electric field part does not need to discharge, the electric field requirement can be met by adjusting the electrode distance, the high voltage requirement is reduced, the voltage/electric field is stable, the requirement on the dust collecting electrode is also reduced, and the manufacturing cost is further reduced. By changing the traditional electrode form, the problem of low efficiency and reliability is solved, and the service life of the equipment is prolonged.
The parts which are not described in the invention can be realized by taking the prior art as reference.
It is intended that any equivalents, or obvious variations, which may be made by those skilled in the art in light of the teachings herein, be within the scope of the present invention.
Claims (17)
1. The utility model provides a pulse lotus electric wet-type electrostatic precipitator defroster, its includes the casing, the casing flue gas entry end and flue gas exit end have, its characterized in that: the distribution filler is arranged in the shell close to the smoke inlet and used for uniformly distributing the smoke to be treated.
2. The pulse charge wet-type electric precipitation demister as claimed in claim 1, wherein: and a pulse discharge electrode group and a pulse power supply are arranged above the distributed filler, the pulse power supply provides pulse high voltage, and corona discharge is generated between the positive electrode and the negative electrode of the pulse discharge electrode group.
3. The pulse charge wet-type electric precipitation demister as claimed in claim 2, wherein: a deflection electric field area is arranged above the pulse discharge electrode group and comprises a dust removal anode tube and a dust removal cathode, and the deflection electric field area is provided with voltage through a direct current power supply.
4. The pulse charge wet-type electric precipitation demister as claimed in claim 3, wherein: the device also comprises a flushing mechanism which is positioned above the deflecting electric field area.
5. The pulse charge wet-type electric precipitation demister as claimed in any one of claims 1-4, wherein: the smoke inlet end is positioned at the bottom of the shell, the smoke outlet end is positioned at the top of the shell, and smoke to be treated enters through the smoke inlet end and is discharged from the smoke outlet end.
6. The pulse charge wet-type electric precipitation demister as claimed in claim 5, wherein: an inner cofferdam and a condensate discharge port for collecting and discharging corrosive condensate are arranged on the shell near the flue gas inlet end.
7. The pulse charge wet-type electric precipitation demister as claimed in claim 5, wherein: the washing mechanism comprises a nozzle and washing water pipelines, the washing water pipelines provide water sources for the nozzle, and the nozzles are distributed right above the deflection electrode group and are provided with a plurality of nozzles.
8. The pulse charge wet-type electric precipitation demister as claimed in claim 5, wherein: the top of casing be round platform form, the bottom of casing is radius platform form, the middle part of casing is cylindricly.
9. The pulse charge wet-type electric precipitation demister as claimed in claim 5, wherein: the voltage of the pulse power supply is 1000-50000 volts, and the voltage of the direct current power supply is 1000-50000 volts.
10. The pulse charge wet-type electric precipitation demister as claimed in claim 8, wherein: and a shielding metal plate is arranged on the wall of the inverted circular truncated cone at the bottom of the shell.
11. The pulse charge wet-type electric precipitation demister as claimed in claim 8, wherein: the pulse discharge electrode group is characterized in that the distance between pulse discharge electrodes in the pulse discharge electrode group is 10-60 mm, a protruding part is arranged on each pulse discharge electrode, and the diameter of each protruding part is 1-20 mm.
12. The pulse charge wet-type electric precipitation demister as claimed in claim 11, wherein: the dedusting anode tube is circular or polygonal, and the length of the dedusting anode tube is 1000-8000 mm.
13. The pulse charge wet-type electric precipitation demister as claimed in claim 11, wherein: the interior of the dedusting cathode tube is hollow, the outer diameter of the dedusting cathode tube is 10-30 mm, and the wall thickness of the dedusting cathode tube is 0.5-4 mm.
14. The treatment method of the pulse charged wet electric precipitation demister as claimed in any one of claims 1-4, characterized by comprising the following steps in sequence:
a. the flue gas enters from a flue gas inlet end, is uniformly distributed by the distribution filler and then enters the pulse discharge electrode group;
b. providing pulse high voltage by a high-voltage pulse power supply, generating corona discharge between a positive electrode and a negative electrode, namely a pulse discharge anode plate and a pulse discharge cathode plate, allowing liquid drops or particles in air flow to enter a dust removal anode tube along with the air flow after the electrode gap is charged, providing voltage by a direct-current high-voltage power supply, forming an electric field between a cathode and an anode, and deflecting the charged particles under the action of the electric field;
c. the dust removal cathode tube and the dust removal anode tube are attached, and the flue gas after dust removal is discharged through a flue gas outlet.
15. The treatment method of the pulse charged wet electric precipitation demister as claimed in claim 14, wherein: and c, cleaning the surfaces of the dedusting cathode and the anode intermittently by using washing water.
16. The treatment method of the pulse charged wet-type electric precipitation demister as claimed in claim 15, wherein: the washing water is intermittently sprayed out by the spray nozzle groups on the upper parts of the washing pipeline and the dust removal pipe, liquid drops on the wall of the device are intercepted and collected by the inner weir and then discharged by the condensate discharge port, and the electric field on the upper part is shielded by the external shielding metal plate.
17. Use of the pulse charged wet electric precipitation demister according to any one of claims 1-4 in flue gas treatment of petroleum, chemical and smelting plants.
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| CN114192282A (en) * | 2021-12-17 | 2022-03-18 | 中国航天科工集团有限公司 | Wet-type electric precipitation equipment |
| CN116576692A (en) * | 2023-07-14 | 2023-08-11 | 山东蓝想环境科技股份有限公司 | Cooling tower for demisting based on nanosecond pulse |
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| CN116576692B (en) * | 2023-07-14 | 2023-09-29 | 山东蓝想环境科技股份有限公司 | Cooling tower for demisting based on nanosecond pulse |
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