WO2019200922A1

WO2019200922A1 - Electrostatic dust removal device for high-temperature coal gas

Info

Publication number: WO2019200922A1
Application number: PCT/CN2018/117574
Authority: WO
Inventors: 方梦祥; 陈泉霖; 岑建孟; 王勤辉; 郑成航; 高翔; 骆仲泱; 岑可法
Original assignee: 浙江大学
Priority date: 2018-04-19
Filing date: 2018-11-27
Publication date: 2019-10-24
Also published as: CN108435424A

Abstract

Disclosed is an electrostatic dust removal device for high-temperature coal gas, comprising: a shell (1) provided with a gas inlet (104) and a gas outlet (105), dust hoppers (3) arranged at the lower part of the shell (1), electrode wires (101) and dust collecting electrode plates (102) arranged in the shell (1), insulators (2) for insulating the electrode wires (101) and the shell (1), a hot gas purging mechanism for purging the insulators (2), and a high-pressure power supply (4) connected to the electrode wires (101); and the insulator (2) is shaped like a hollow cylinder, the hollow structure of the insulator (2) faces the interior of the shell (1), a cylinder (201) used for penetrating through the electrode wire (101) is arranged on an inner side of the bottom of the insulator (2), and a ventilation structure is arranged on a side wall of the insulator (2). With the device, tar oil and dust particles adhered to the insulator (2) can be effectively reduced, thereby avoiding creepage of the insulator (2).

Description

Electrostatic dust removing device for high temperature gas

Technical field

The invention belongs to the technical field of high temperature dust removal, and particularly relates to an electrostatic dust removal device for high temperature gas.

Background technique

Coal-based polygeneration technology based on coal pyrolysis is an important technical means for efficient and clean coal utilization. Pyrolysis and gasification of coal with high volatile content in high temperature and anoxic environment can obtain gas, tar and Semi-coke, gas can be separated and purified to obtain high-quality gas fuel. The tar can obtain high-quality chemical products through further deep processing. The semi-coke can be directly used for combustion and power generation, so as to achieve clean utilization of coal graded conversion, which has broad application prospects.

The crude gas produced by pyrolysis gasification of coal contains a large amount of particulate matter such as fly ash and coal. The tar obtained by direct condensation separation contains a large amount of particulate matter, which will have a great adverse effect on subsequent processing and utilization. High-temperature pyrolysis gas has high temperature (600 ° C and above), gas composition mainly in reducing atmosphere (such as CH ₄ , H ₂ ), tar-containing (easy to condense below 400 ° C), etc. More difficult. At present, an important problem that hinders the industrial application of coal-based polygeneration technology is that high temperature (above 400 °C) pyrolysis gas dedusting has not been well solved.

At present, high-temperature dust removal technologies mainly include cyclone dust removal technology, ceramic/metal filtration dust removal technology, particle layer dust removal technology and electrostatic dust removal technology. Cyclone dust collector has low dust removal efficiency for fine particles and can only be used as pretreatment equipment; ceramic/metal filter dust collector has high dust removal efficiency, but ceramic filter dust removal equipment has poor thermal shock and brittleness, and metal filter dust collector is easy to corrode at high temperature; The layer dust collector faces the problems of large pressure loss, high energy consumption and difficulty in regenerating the working medium.

The electrostatic precipitator technology has the advantages of high dust removal efficiency, low pressure loss and large amount of flue gas treatment. It has been widely used in conventional coal-fired power plants. However, in the high-temperature pyrolysis gas environment, the following difficulties exist.

In the discharge process of electrostatic precipitator, since the main component of pyrolysis gas is non-electron negative gas such as methane and hydrogen, the discharge current is mainly composed of electron current, and the efficiency of particle charging is greatly reduced, thereby affecting dust removal efficiency; The gap between the dizzying voltage and the breakdown voltage is reduced, which causes the electrostatic precipitator to be easily broken down during operation, which affects the stable operation of the precipitator.

The high temperature pyrolysis gas is rich in tar. During the operation of the electrostatic precipitator, the insulator tends to adhere to tar and dust particles, especially the inner wall surface of the insulator, causing the insulator to creep up, affecting the stable operation of the dust collector; dust particles mixed with tar Adhesion is enhanced and adheres to the dust collecting plate, which makes it difficult to clean the dust, thus affecting the stable operation of the dust collector.

Summary of the invention

The object of the present invention is to provide an electrostatic precipitator for high temperature gas, which can effectively reduce the adhesion of tar and dust particles on the insulator and avoid creepage of the insulator.

The technical solution provided by the invention is:

An electrostatic precipitator for a high temperature gas, comprising: a casing having a gas inlet and outlet, a ash hopper disposed at a lower portion of the casing, an electrode wire and a dust collecting plate disposed in the casing, and an insulating electrode wire and a casing Insulator, a hot air purging mechanism for purging the insulator, and a high voltage power source connected to the electrode line; the insulator is in the shape of a hollow cylinder, the hollow structure of the insulator faces the inside of the casing, and the inner side of the bottom of the insulator is provided for Through the cylinder of the electrode wire, the side wall of the insulator is provided with a ventilation structure.

In the above technical solution, since the side wall of the insulator is provided with a ventilation structure, when the hot gas purging mechanism works for the insulator, the temperature of the insulator can be controlled at 350-450 ° C to prevent condensation of tar on the surface and the inside of the insulator in the pyrolysis gas. Creepage, at the same time, can avoid the occurrence of leakage due to the deterioration of insulation performance due to excessive temperature.

The high temperature gas in the present invention includes pyrolysis gas, high temperature gasification gas, and the like.

The insulator in the invention is made of 99% corundum and is a high-purity corundum insulator for ensuring the insulation performance at high temperature and ensuring the insulation between the electrode wire and the casing; the insulation performance requirement of the high-purity corundum insulator is: volume resistivity Above room temperature exceeds 10 ¹⁴ Ωcm, the Te value (temperature at which the volume resistivity drops to 1 M Ω cm) is greater than 1000 ° C. The shape of the insulator is a hollow cylinder having a diameter of more than 300 mm and a height of more than 500 mm, and the thickness of the insulator wall is greater than 10 mm.

Preferably, the ventilation structure is a venting hole, and 4-16 holes are arranged on the side wall of the insulator, and the aperture is 10-50 mm. It is further preferred to open a hole in the middle portion of the side wall of the insulator.

Preferably, the length of the cylinder is greater than 600 mm. The cylindrical hollow is used to pass through the electrode wire, and its wall thickness can be greater than 5 mm, and the structure of the cylinder can extend the creepage distance.

The hot air purging mechanism of the present invention comprises a sleeve, a gas supply pipe connecting the sleeve and a gas electric heater; the sleeve is mounted on the casing and sleeved outside the insulator. The hot air purging mechanism is used for the insulation and purging of the insulator to prevent the tar in the pyrolysis gas from condensing on the surface of the insulator to cause creepage, and at the same time avoid leakage such as leakage due to excessive temperature. The hot air purge wind speed at the ventilating structure of the insulator is controlled to be 0.5-5 m/s by controlling the gas electric heater, and the temperature of the insulator is controlled at 350-450 °C.

Preferably, the hot air in the hot air purging mechanism is made of steam or hot gas (the same as the oil-free gas component in the electrostatic precipitator). The hot gas component of the hot air purging mechanism cannot contain oxygen, and it is prevented from mixing with the gas in the electrostatic precipitator under high temperature and exploding.

Preferably, a cavity is formed between the sleeve and the side wall of the insulator such that the air supply tube and the cavity are in communication with the venting structure. The structure is arranged such that the purged hot gas can sequentially pass through the air supply pipe, the cavity and the ventilation structure, and enter the inner side of the insulator to prevent the tar in the pyrolysis gas from condensing inside the insulator and causing creepage.

Preferably, a sealing gasket is provided at the side wall seal of the sleeve and the insulator.

In the present invention, the middle of the casing is a hollow cylinder, and the two ends of the hollow cylinder are respectively a conical gas inlet and a gas outlet. The electrostatic precipitator adopts a cylindrical outer casing to prevent deformation caused by high temperature thermal expansion. In addition, the cylindrical outer casing has the advantages of pressure resistance, explosion proof and more uniform temperature field. The gas inlet and the gas outlet are tapered in shape to facilitate control of the amount of gas in and out. Preferably, the high-temperature dust-containing pyrolysis gas has a flow rate of 0.8-1.5 m/s in the device, ensuring a high migration rate of the dust particles in the device, and the residence time of the dust-containing gas in the device is 8-15 s. Ensure that dust particles are fully removed. Preferably, the gas inlet and the gas outlet are respectively provided with baffles to ensure uniform flow of gas within the device.

Preferably, the outer side of the casing is provided with a heating mechanism and a heat insulating layer. The heating mechanism can adopt electric heating or hot gas heating. By adjusting the power of the electric auxiliary heating device or the flow rate of the hot gas, the temperature in the casing is controlled to be 400-600 ° C, which is used to prevent the tar from condensing in the casing due to the low temperature, resulting in cohesiveness. The accumulation of ash, while preventing the temperature from being too high, causes the housing to be unstable during discharge and operation. The material of the insulation layer is rock wool board with a thickness of 150-200mm, and the outside temperature of the control insulation layer is not higher than 50 °C.

If the heating mechanism outside the casing of the electrostatic precipitator is heated by hot gas, it is preferred that the hot gas is an inert gas such as hot nitrogen or hot flue gas, which can provide heating and heat preservation for the electrostatic precipitator, and can also serve as a sealing layer to avoid electrostatic precipitator. The internal gas is in contact with the outside air and an explosion occurs.

Advantageously, said high voltage power source is a switchable polarity high voltage DC power source. The supply voltage of the switchable polarity high voltage DC power supply can be 50-200kV. In a non-electron negative atmosphere (CH ₄ , H ₂ , N ₂ ), the use of a positive-voltage high-voltage power source has the advantages of high dust removal efficiency and low energy consumption; in the gas component, an electronegative gas (water vapor, CO ₂ ) In the main atmosphere, the use of a negative-voltage high-voltage power supply is more efficient in dust removal. The device can switch the polarity high-voltage DC power supply, which can effectively deal with the problem of unstable operation and low dust removal efficiency caused by the change of pyrolysis gas composition.

In the present invention, a plurality of dust collecting plates are disposed in the casing, and the dust collecting plates are disposed in parallel in the airflow direction of the casing; the electrode wires are disposed between adjacent dust collecting plates. The dust collecting plate adopts a C-shaped dust collecting electrode plate, and the dust collecting plate is rolled by a steel plate of 1.5-10 mm, the width is 350-850 mm, and the dust collecting electrode is formed by splicing a plurality of C-shaped dust collecting plates. The C-shaped dust collecting plate has a large dust-covered area, which is beneficial for reducing the secondary dust of the dust. The spacing of the adjacent dust collecting plates is 400-800mm, and the wide dust collecting pole spacing is used to improve the breakdown voltage, thereby adopting a higher power supply voltage and improving the dust removing efficiency. Preferably, the electrode wire is a light round wire having a diameter of 2-5 mm, and the spacing of adjacent electrode wires is 400-900 mm. The use of a light round wire is beneficial to increase the breakdown voltage, thereby improving dust removal efficiency and operational stability.

Preferably, the dust collecting plate is hung in the casing, and a high frequency rapping mechanism is arranged at the bottom thereof to prevent the dust from being blocked due to agglomeration.

Preferably, the top of the electrode line is provided with a high-frequency rapping mechanism for preventing dust from sticking on the high-voltage electrode line, causing the corona line to be enlarged, affecting the dust removal efficiency and stable operation.

Preferably, a baffle is disposed between the casing and the outermost dust collecting plate. The baffle is used to reduce the proportion of dust-laden gas passing through the airflow, thereby improving the overall dust removal efficiency.

In the present invention, the ash hopper is disposed at the lower portion of the casing for collecting dust. The number of ash hoppers can be selected according to actual working conditions, preferably 1 to 10. The ash bucket is provided with a high frequency oscillating mechanism. It can prevent dust from being clogged due to agglomeration.

Preferably, a baffle is disposed in the ash hopper. The baffle is used to reduce the proportion of dust-laden gas passing through the airflow, thereby improving the overall dust removal efficiency.

Preferably, the outer periphery of the ash hopper is provided with a heat insulating mechanism and a ash hopper insulation layer to prevent tar from condensing in the ash hopper.

Preferably, the material of the casing, the ash hopper, the electrode wire and the dust collecting plate of the device can be made of heat-resistant alloy steel or 310S stainless steel to achieve stable operation under high temperature conditions of 800 ° C.

Compared with the prior art, the beneficial effects of the present invention are embodied in:

(1) The electrostatic precipitator for high-temperature gas in the present invention can effectively reduce the adhesion of tar and dust particles on the insulator by avoiding the creepage of the insulator by improving the structure of the insulator.

(2) The electrostatic precipitator for high temperature gas in the present invention can be applied to high temperature coal pyrolysis gas purification, and is used for particle trapping of oily dusty gas generated by coal pyrolysis. It not only can form a stable discharge in a high-temperature reducing atmosphere, but also can achieve stable operation under high temperature conditions of 400-600 ° C and effectively capture particulate matter in the pyrolysis gas.

(3) The electrostatic precipitator for high temperature gas in the present invention can improve the energy of the system by capturing the particulate matter in the pyrolysis gas of the high temperature coal to purify the gas, improve the quality of the subsequent condensed tar and other gasification products, and the like. Utilization efficiency; in addition, the equipment operating resistance is less than 600Pa.

DRAWINGS

1 is a schematic structural view of an electrostatic precipitator for a high temperature pyrolysis gas;

Figure 2 is a left side view of an electrostatic precipitator for high temperature pyrolysis gas;

Figure 3 is an enlarged view of the area A in Figure 1;

4 is a schematic structural view of an insulator;

Figure 5 is a schematic view showing the structure of the B-B surface of Figure 4;

Wherein, 1, housing; 101, electrode line; 102, dust collecting plate; 103, fixing frame; 104, gas inlet; 105, gas outlet; 106, inlet deflector; 107, outlet deflector; High frequency rapping mechanism; 109, heating mechanism; 110, thermal insulation layer; 111, first spoiler; 2, insulator; 201, cylinder; 202, perforation; 203, hollow structure; 204, sealing gasket; 205, ventilation hole; 206, cavity; 3, ash bucket; 301, ash discharge valve; 302, ash bucket insulation layer; 303, second spoiler; 4, high voltage power supply; 401, wire; 5, gas electric heater; 501, set Cartridge; 502, air supply pipe; 503, air intake.

detailed description

The present invention will be further described below in conjunction with the drawings and specific examples, but the scope of the present invention is not limited thereto.

An electrostatic precipitator for high temperature pyrolysis gas as shown in FIGS. 1 and 2, comprising: a casing 1 having a gas inlet and outlet, an ash hopper 3 disposed at a lower portion of the casing 1, and an electrode wire disposed in the casing 1 101 and a dust collecting plate 102, an insulator 2 for insulating the electrode wire 101 and the casing 1, a hot air purging mechanism for purging the insulator 2, and a high voltage power source 4 connected to the electrode wire 101.

The middle of the casing 1 is a hollow cylinder, and the two ends of the hollow cylinder are respectively a tapered gas inlet 104 and a gas outlet 105. The electrostatic precipitator adopts a cylindrical outer casing to prevent deformation caused by high temperature thermal expansion. In addition, the cylindrical outer casing has the advantages of pressure resistance, explosion proof and more uniform temperature field. The gas inlet 104 and the gas outlet 105 are tapered in shape to facilitate control of the amount of gas in and out. The gas inlet 104 and the gas outlet 105 are provided with an inlet baffle 106 and an outlet baffle 107, respectively, to ensure uniform flow of gas within the device. The high-temperature dust-containing pyrolysis gas has a flow rate of 0.8-1.5m/s in the device, ensuring a high migration rate of dust particles in the device, and the residence time of the dust-containing pyrolysis gas in the device is 8-15s, ensuring dust particles. Can be fully removed.

A heating mechanism 109 and an insulating layer 110 are provided on the outer side of the casing 1. The heating mechanism 109 can be electrically heated or heated by hot gas. By adjusting the power of the electric auxiliary heating device or the flow rate of the hot gas, the temperature in the casing 1 is controlled to be 400-600 ° C, and the temperature is too low to cause the tar to condense in the casing 1 . , causing cohesive ash accumulation, while preventing the temperature from being too high, resulting in instability of the casing 1 during discharge and operation. The material of the heat insulating layer 110 is rock wool board with a thickness of 150-200 mm, and the temperature outside the control heat insulating layer 110 is not higher than 50 °C.

A plurality of dust collecting plates 102 are disposed in the casing 1 , and the dust collecting plate 102 is hung in the casing 1 through the fixing frame 103 , and a high frequency rapping mechanism 108 is disposed at the bottom thereof to prevent the dust from being blocked due to agglomeration. . The dust collecting plate 102 is arranged in parallel in the air flow direction of the casing 1, and the dust collecting plate 102 is formed by a C-shaped dust collecting electrode plate, which is rolled by a steel plate of 1.5-10 mm, has a width of 350-850 mm, and the dust collecting electrode 102 is composed of a plurality of pieces. C-shaped dust collecting plates are spliced together. The C-shaped dust collecting plate has a large dust-covered area, which is beneficial for reducing the secondary dust of the dust. The spacing of the adjacent dust collecting plates 102 is 400-800 mm, and the wide dust collecting pole spacing is adopted, which is advantageous for increasing the breakdown voltage, thereby adopting a higher power supply voltage and improving the dust removing efficiency.

As shown in FIG. 2, a first spoiler 111 is disposed between the casing 1 and the outermost dust collecting plate 102. The first spoiler 111 is used to reduce the proportion of the dust-containing gas passing through the airflow bypass, thereby improving the overall dust removal efficiency.

The electrode line 101 is disposed between the adjacent dust collecting plates 102. The electrode line 101 is a light round line having a diameter of 2-5 mm, and the spacing of the adjacent electrode lines 101 is 400-900 mm. The use of a light round wire is beneficial to increase the breakdown voltage, thereby improving dust removal efficiency and operational stability. Similarly, a high-frequency rapping mechanism (not shown) is disposed on the top of the electrode wire 101 for preventing dust from sticking on the high-voltage electrode wire 101, causing the corona wire to be enlarged, affecting dust removal efficiency and stable operation.

The electrode wire 101 is in communication with the high voltage power source 4 through the electric wire 401. The high voltage power supply 4 is a switchable polarity high voltage DC power supply. The supply voltage of the switchable polarity high voltage DC power supply can be 50-200kV. In a non-electron negative atmosphere (CH ₄ , H ₂ , N ₂ ), the use of a positive-voltage high-voltage power source has the advantages of high dust removal efficiency and low energy consumption; in the gas component, an electronegative gas (water vapor, CO ₂ ) In the main atmosphere, the use of a negative-voltage high-voltage power supply is more efficient in dust removal. The device can switch the polarity high-voltage DC power supply, which can effectively deal with the problem of unstable operation and low dust removal efficiency caused by the change of pyrolysis gas composition.

As shown in Figures 3 to 5, the insulator 2 is made of 99% corundum and is a high-purity corundum insulator for ensuring insulation at high temperatures and ensuring insulation between the electrode wire 101 and the casing 1; high-purity corundum insulator insulation The performance requirements are as follows: the volume resistivity exceeds 10 ¹⁴ Ωcm at normal temperature, and the Te value (temperature at which the volume resistivity drops to 1 MΩcm) is greater than 1000 °C.

The insulator 2 is in the form of a hollow cylinder having a diameter of more than 300 mm, a height of more than 500 mm, and a thickness of the insulator wall of more than 10 mm. The hollow structure 203 of the insulator 2 faces the inside of the casing 1. The inner side of the bottom of the insulator 2 is provided with a cylinder 201 having a length of more than 600 mm and a wall thickness of more than 5 mm. The structure of the cylinder can extend the creepage distance. The cylinder 201 is provided with a through hole 202 for passing through the electrode wire 101, and four vent holes 205 are distributed in the middle portion of the side wall of the insulator 2, and the hole diameter may be 10-50 mm. Since the side wall of the insulator 2 is provided with the venting hole 205, when the hot air purging mechanism works for the insulator 2, the temperature of the insulator 2 can be controlled at 350-450 ° C to prevent the tar in the pyrolysis gas from condensing on the surface and the inside of the insulator 2 to cause climbing. At the same time, it is possible to avoid leakage or the like caused by a decrease in insulation performance due to an excessive temperature.

The hot air purging mechanism includes a sleeve 501, an air supply pipe 502 that communicates with the sleeve 501, and a gas electric heater 5. The sleeve 501 is mounted on the housing 1 and sleeved outside the insulator 2. The hot air purging mechanism is used for the heat preservation and purging of the insulator 2 to prevent the tar in the pyrolysis gas from condensing on the surface of the insulator 2 to cause creepage, and to avoid leakage due to a decrease in insulation performance due to excessive temperature. By controlling the gas electric heater 5, the hot air purge wind speed at the vent 205 of the insulator is controlled to 0.5 - 5 m/s, and the temperature of the insulator 2 is controlled at 350 - 450 °C.

As shown in FIG. 3, a cavity 206 is formed between the sleeve 501 and the side wall of the insulator 2, and the air supply pipe 502 is connected to the air inlet hole 503 of the sleeve 501, so that the air supply pipe 502 and the cavity 206 communicate with the air vent 205. The structure is arranged such that the purged hot gas can sequentially pass through the supply air 502, the cavity 206 and the venting opening 205, and enter the inside of the insulator 2 to prevent the tar in the pyrolysis gas from condensing inside the insulator 2 to cause creepage. A sealing gasket 204 is provided at the side wall seal of the sleeve 501 and the insulator 2.

The ash hopper 3 is disposed at the lower portion of the casing 1 for collecting dust, and the dust is discharged by opening the ash discharging valve 301. The number of ash hoppers 3 can be selected according to actual working conditions, and is three in this embodiment. The ash bucket 3 can also be provided with a high-frequency oscillating mechanism (not shown) to prevent clogging of dust due to agglomeration. In addition, a second spoiler 303 is disposed in the hopper 3, and the second spoiler 303 is used to reduce the proportion of the dust-containing gas passing through the airflow, thereby improving the overall dust removal efficiency. The periphery of the hopper 3 is also provided with a heat insulating mechanism (not shown) and a ash insulation layer 302 to prevent tar from condensing in the hopper 3.

The gas inlet 104, the inlet deflector 106, the electrode wire 101, the dust collecting plate 102, the casing 1, the ash hopper 3, the gas outlet 105, and the outlet deflector 107 in the components of the electrostatic precipitator are all made of a heat resistant alloy. Steel or 310S stainless steel, able to withstand long-term stability at 800 °C.

The working process is as follows:

The high-temperature oil-containing dust-containing pyrolysis gas enters the inside of the casing 1 of the device after passing through the gas inlet 104 and the inlet baffle 106, and the electrode wire 102 and the casing 1 are insulated by the high-purity corundum insulator 2, and the insulator 2 The outer sleeve is provided with a hot air purging mechanism, and the wind speed of purging the hot air at the vent 205 of the insulator 2 is controlled to 0.5-5 m/s by the operation of the hot air purging mechanism, and the surface temperature of the insulator is controlled at 350-450 ° C, Prevent the tar in the pyrolysis gas from condensing on the surface of the insulator 2 to cause creepage, and at the same time avoid the occurrence of leakage due to the deterioration of the insulation performance due to excessive temperature.

The electrode line 101 is connected with a switchable polarity high voltage DC power source for forming a high voltage electric field and a corona discharge between the electrode line 101 and the dust collecting plate 102. Under the action of the electrostatic force, the dust particles in the high temperature gas are taken. The upper charge is applied to the dust collecting plate 102 under the action of the electric field force. After a period of accumulation, the high-frequency rapping mechanism 108 performs rapping to cause the dust to fall off the dust collecting plate 102, and falls into the ash hopper 3. After the dust accumulates to a certain amount, the ash discharging valve 301 is opened to discharge the dust. Waiting for the next processing and utilization; the purified gas enters the downstream process through the gas outlet 105 and the outlet deflector 107.

The invention can fully capture fine particles in the oily dusty pyrolysis gas at high temperature, ensure the purity of the tar during the subsequent condensation preparation of the tar, and the quality of the gas. It can achieve 95% dust removal efficiency at 600 °C, 98% dust removal efficiency at 400 °C, and the running resistance of the device is less than 600Pa.

Claims

An electrostatic precipitator for a high-temperature gas, comprising: a casing having a gas inlet and outlet, a ash hopper disposed at a lower portion of the casing, and an electrode wire and a dust collecting plate disposed in the casing for insulation An insulator of the electrode wire and the casing, a hot gas purging mechanism for purging the insulator, and a high voltage power source connected to the electrode wire; the insulator is in the shape of a hollow cylinder, and the hollow structure of the insulator faces the inside of the casing, and the bottom of the insulator A cylinder for passing through the electrode wire is provided on the inner side, and a side wall of the insulator is provided with a ventilation structure.
The electrostatic precipitator for high temperature gas according to claim 1, wherein the ventilation structure is a venting hole, and 4-16 holes are arranged on the side wall of the insulator, and the aperture is 10-50 mm; The length is greater than 600mm.
The electrostatic precipitator for high temperature gas according to claim 1, wherein the hot gas purging mechanism comprises a sleeve, an air supply pipe connecting the sleeve, and a gas electric heater; the sleeve is mounted on the casing On the outside, set on the outside of the insulator.
The electrostatic precipitator for high temperature gas according to claim 3, wherein a cavity is formed between the sleeve and the side wall of the insulator such that the air supply pipe and the cavity communicate with the ventilation structure.
The electrostatic precipitator for high temperature gas according to claim 1, wherein the middle of the casing is a hollow cylinder, and the two ends of the hollow cylinder are respectively a conical gas inlet and a gas outlet.
The electrostatic precipitator for high temperature gas according to claim 1, wherein a heating mechanism and a heat insulating layer are disposed outside the casing.
The electrostatic precipitator for high temperature gas according to claim 1, wherein the high voltage power source is a switchable polarity high voltage DC power source.
The electrostatic precipitator for high-temperature gas according to claim 1, wherein a plurality of dust collecting plates are disposed in the casing, and the dust collecting plates are disposed in parallel in a direction of airflow in the casing; Set between adjacent dust collecting plates.
The electrostatic precipitator for high temperature gas according to claim 8, wherein a baffle is disposed between the casing and the outermost dust collecting plate.
The electrostatic precipitator for high temperature gas according to claim 1, wherein a baffle is disposed in the ash hopper.