CN115025880A - High-temperature sealing coupling hot air purging system for high-temperature electric precipitator insulator - Google Patents
High-temperature sealing coupling hot air purging system for high-temperature electric precipitator insulator Download PDFInfo
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- CN115025880A CN115025880A CN202210567531.3A CN202210567531A CN115025880A CN 115025880 A CN115025880 A CN 115025880A CN 202210567531 A CN202210567531 A CN 202210567531A CN 115025880 A CN115025880 A CN 115025880A
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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
- B03C3/019—Post-treatment of gases
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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
- B03C3/66—Applications of electricity supply techniques
- B03C3/70—Applications of electricity supply techniques insulating in electric separators
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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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Abstract
The invention discloses a high-temperature sealing coupling hot air blowing system for a high-temperature electric precipitator insulator, and relates to the technical field of atmospheric pollution treatment. The problem of because of there is the pressure differential that high temperature difference arouses between insulator room and the dust remover treatment flue gas to make dusty flue gas lifting get into the insulator room, lead to the insulator insulation ageing is solved. The method comprises the following steps: the air inlet end of the electric heater is connected with the first flue gas outlet of the high-temperature electric dust remover and is used for heating the high-temperature clean flue gas after dust removal of the high-temperature electric dust remover so that the temperature of the heated high-temperature clean flue gas is higher than that of the high-temperature clean flue gas after dust removal; the upper opening and the lower opening of the insulator are arranged on the inner top cover of the high-temperature electric dust collector in a circular truncated cone shape, the lower port of the insulator is contacted with the inner top cover, and the upper port of the insulator is contacted with the insulator supporting plate; the air inlet end of the hot air pipe is connected with the outlet of the electric heater, the hot air pipe is arranged on the outer surface of the insulator in a winding mode, and the outlet of the hot air pipe is connected with the second smoke outlet of the high-temperature electric dust remover through a pipeline.
Description
Technical Field
The invention relates to the field of atmospheric pollutant treatment, in particular to a high-temperature sealing coupling hot air blowing system for an insulator of a high-temperature electric precipitator.
Background
The high-temperature electrostatic dust removal technology can realize high-temperature gas high-efficiency dust removal, and has great significance for dust treatment in industries such as cement, glass, steel, petrifaction, nonferrous metal, phosphorus-making furnace gas, coal pyrolysis, cement kiln bypass air bleeding purification and the like. Because of different process requirements, energy recovery or environmental emission standard, the high-temperature dust-containing flue gas in the process system needs to be dedusted, and high-temperature flue gas purification is realized.
The insulator is a key component for establishing and maintaining a high-voltage electric field of the electric dust collector, and under the combined action of the electric field and the temperature field, the thermal breakdown and the insulation aging of the insulator are main forms causing the insulation failure of the insulator. With the successful research and development of high-temperature electrical property materials and the further optimization of the properties of the materials, the materials with good high-temperature electrical property can be selected to effectively prevent the thermal breakdown of the insulator. The study shows that 85 porcelain, 90 porcelain, 95 porcelain and 99 porcelain t e Values of 850 ℃, 960 ℃, 1000 ℃ and 1170 ℃ (temperature when the material resistivity drops to 1M Ω · cm) can be achieved. And the insulation aging of the insulator happens occasionally, which forces owners to stop the machine for maintenance and invest a large amount of cost. The insulation aging of the insulator is that when gas with lower electric strength resistance and a local electric field adsorbing dust on the surface of the insulator reach the initial corona field intensity, local corona discharge is caused, and the insulation aging of the insulator is caused after long-time operation, so that the normal operation of the electric dust collector is influenced.
The insulator protection system of the current high-temperature electric precipitator refers to a hot air blowing system of an insulator chamber of the electric precipitator of a coal-fired power plant, the hot air blowing temperature is higher than the acid dew point temperature of flue gas, the temperature difference between the insulator chamber temperature and the flue gas treatment temperature is not large, however, the temperature of flue gas treated by the high-temperature electric dust remover is high (250-650 ℃), the electric heating temperature of the insulator chamber is only heated to be higher than the acid dew point temperature of the flue gas (180-300 ℃), the temperature difference between the treated flue gas temperature and the temperature of the insulator chamber is as high as 300 ℃, the pressure difference caused by the temperature difference between the insulator chamber and the temperature of the dust remover treated flue gas causes the dust-containing flue gas to be lifted, the hot air blowing formed by the negative pressure operation of the dust remover cannot be overcome, the dust-containing flue gas is lifted to enter the insulator chamber, the gas with low electric strength resistance and the dust attached to the inner surface of the insulator form local corona discharge, the insulator is insulated and aged for a long time, and the normal operation of the electric dust remover is influenced.
Disclosure of Invention
The embodiment of the invention provides a high-temperature sealing coupling hot air purging system for insulators of a high-temperature electric precipitator, which is used for solving the problem that the insulation aging of the insulators is caused by the fact that the dust-containing flue gas is lifted to enter an insulator chamber due to the pressure difference caused by the temperature difference between the insulator chamber and the flue gas treated by the precipitator, and the partial corona discharge is formed between the gas with low electric strength resistance and the dust attached to the inner surface of the insulators.
The embodiment of the invention provides a high-temperature sealing coupling hot air purging system for insulators of a high-temperature electric precipitator, which comprises:
the air inlet end of the electric heater is connected with the first flue gas outlet of the high-temperature electric dust remover and is used for heating the high-temperature clean flue gas after dust removal of the high-temperature electric dust remover so that the temperature of the heated high-temperature clean flue gas is higher than that of the high-temperature clean flue gas after dust removal;
the upper opening and the lower opening of the insulator are arranged on the inner top cover of the high-temperature electric dust collector in a circular truncated cone shape, the lower port of the insulator is contacted with the inner top cover, and the upper port of the insulator is contacted with the insulator supporting plate; the air inlet end of the hot air pipe is connected with the outlet of the electric heater, the hot air pipe is arranged on the outer surface of the insulator in a winding mode, and the outlet of the hot air pipe is connected with the second smoke outlet of the high-temperature electric dust remover through a pipeline.
Preferably, the insulator supporting plate is provided with an inclined diversion hole, a vertical diversion hole and a hanging hole;
the vertical diversion holes, the inclined diversion holes and the hanging holes are all arranged concentrically with the insulator supporting plate, and the distance between the vertical diversion holes and the round points of the concentric circles is smaller than the distance between the inclined diversion holes and the diameters of the round points of the concentric circles;
the hanging hole is used for arranging a hanging rod, one end of the hanging rod penetrates through the hanging hole and is fixed at the upper end of the insulator supporting plate, and the other end of the hanging rod penetrates through the inner top cover and extends into the high-temperature electric dust collector.
Preferably, a boss is arranged at the lower end of the insulator supporting plate, the diameter of the insulator supporting plate is larger than the outer diameter of the upper port of the insulator, and the inner diameter of the upper port of the insulator is larger than the diameter of the boss.
Preferably, the thickness of the insulator supporting plate is 25 mm-30 mm;
the vertical flow guide holes are arranged at the radius of the insulator support plate 1/3, and the number of the vertical flow guide holes is 4;
the inclined diversion holes are arranged at the radius of the insulator supporting plate 2/3 and comprise 8;
the aperture of the vertical diversion hole and the aperture of the inclined diversion hole are between 8mm and 12 mm.
Preferably, the opening angle of the inclined diversion holes is between 10 and 25 degrees.
Preferably, the insulator further comprises a sealing gasket, the sealing gasket is arranged between the lower port of the insulator and the inner top cover, and the sealing gasket is arranged between the upper port of the insulator and the insulator supporting plate;
the sealing gasket is made of graphite packing.
Preferably, the dust cover is arranged at the lower part of the top cover in the high-temperature electric dust remover, welded and arranged concentrically with the hanger rod penetrating through the insulator support plate;
the dust cover is made of common carbon structural steel, the dust cover is in the shape of a cylindrical barrel, the diameter of the cylindrical barrel is 400-550 mm, the height of the cylindrical barrel is 450-550 mm, and the thickness of the barrel wall is 3-5 mm.
Preferably, the diameter of the dust cover cylinder is consistent with the diameter of the inner top cover opening and the diameter of the lower end opening of the insulator, and a through hole is formed.
Preferably, the hot air pipe has a specification phi 10 x 2 and is made of common carbon structural steel.
Preferably, the system also comprises a controller, a first temperature sensor, a second temperature sensor and an induced draft fan;
one end of the induced draft fan is connected with a first flue gas outlet of the high-temperature electric dust collector, and the other end of the induced draft fan is connected with the air inlet end of the electric heater;
the first temperature sensor is arranged at the air inlet end of the induced draft fan and used for determining the first temperature of the high-temperature clean flue gas after dust removal of the high-temperature electric dust remover;
the second temperature sensor is arranged in the insulator chamber and used for determining a second temperature in the insulator chamber;
the first temperature sensor, the second temperature sensor and the electric heater are electrically connected with the controller respectively.
The controller is used for determining that the electric heater heats the high-temperature clean flue gas after dust removal according to the temperature difference between the first temperature and the second temperature.
Preferably, the second temperature is 3-5 ℃ higher than the first temperature, wherein the first temperature is consistent with the temperature of the high-temperature electric dust remover for treating the flue gas.
The embodiment of the invention provides a high-temperature sealing coupling hot air purging system for insulators of a high-temperature electric precipitator, which comprises: the air inlet end of the electric heater is connected with the first flue gas outlet of the high-temperature electric dust collector and is used for heating the high-temperature clean flue gas subjected to dust removal by the high-temperature electric dust collector so as to enable the temperature of the heated high-temperature clean flue gas to be higher than that of the high-temperature clean flue gas subjected to dust removal; the upper opening and the lower opening of the insulator are arranged on the inner top cover of the high-temperature electric dust collector in a circular truncated cone shape, the lower port of the insulator is contacted with the inner top cover, and the upper port of the insulator is contacted with the insulator supporting plate; the air inlet end of the hot air pipe is connected with the outlet of the electric heater, the hot air pipe is arranged on the outer surface of the insulator in a winding mode, and the outlet of the hot air pipe is connected with the second smoke outlet of the high-temperature electric dust remover through a pipeline. This system passes through electric heater, can be to the clean flue gas of high temperature reheating after the dust removal, make the temperature that gets into the clean flue gas of high temperature after the heating in the insulator be higher than the temperature of the clean flue gas of high temperature after the dust removal, eliminate the big dust-laden flue gas lifting that leads to of high temperature electrostatic precipitator technique insulator room and dust remover body difference in temperature and get into the problem of insulator room, the hot-blast sweeping that coupling electrostatic precipitator negative pressure operation formed simultaneously, effectively prevented dust-laden flue gas lifting and got into the insulator room, guarantee that high temperature electrostatic precipitator realizes lasting high-efficient operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a high-temperature sealing coupling hot air purging system for insulators of a high-temperature electric precipitator according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of an insulator support plate according to an embodiment of the present invention;
fig. 3 is a schematic view of an insulator support plate B shown in fig. 2 according to an embodiment of the present invention;
FIG. 4 is an enlarged partial schematic view of FIG. 1A provided in accordance with an embodiment of the present invention;
wherein: 1. a high-temperature electric dust remover; 2. a first temperature sensor; 3. an induced draft fan; 4. an electric heater; 5. a control system; 6. a second temperature sensor; 7. an insulator support plate; 701. inclining the flow guide holes; 702. vertical flow guide holes; 703. a hanging hole; 704. an insulator boss; 8. a fastener; 9. an insulator chamber; 901: a housing; 902: a heat-insulating layer; 10. a sealing device; 11. a hot air pipe; 12. an insulator; 13. a dust remover inner top cover; 14. a dust cover; 15. a boom.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
FIG. 1 is a schematic structural diagram of a high-temperature sealing coupling hot air purging system for insulators of a high-temperature electric precipitator according to an embodiment of the present invention; fig. 2 is a schematic cross-sectional view of an insulator support plate according to an embodiment of the present invention; fig. 3 is a schematic view of an insulator support plate B shown in fig. 2 according to an embodiment of the present invention; fig. 4 is a partially enlarged schematic view of fig. 1A according to an embodiment of the present invention, and the hot air purging system according to an embodiment of the present invention is described in detail below with reference to fig. 1 to 4.
As shown in fig. 1, a hot air purging system provided in an embodiment of the present invention mainly includes: the electric heater 4, the insulator 12, the hot-blast main 11 and the high-temperature electric dust collector 1. Wherein, insulator 12 and hot-blast main 11 set up in insulator room 9, and insulator room 9 is located high temperature electrostatic precipitator 1 directly over, and electric heater 4 sets up the outside of insulator room 9 and high temperature electrostatic precipitator 1.
Specifically, one end of the high-temperature electric dust collector 1 is a flue gas inlet, and the other end of the high-temperature electric dust collector comprises a first flue gas outlet and a second flue gas outlet. Electric heater 4, the inlet end that its included and high temperature electrostatic precipitator 1's first flue gas exit linkage, the clean flue gas of high temperature who comes from behind the high temperature electrostatic precipitator 1 dust removal passes through electric heater 4's inlet end. Insulator 12, its upper and lower opening is the round platform shape, because insulator room 9 sets up directly over high temperature electrostatic precipitator 1, and insulator 12 sets up in insulator room 9, consequently, insulator 12 sets up on the interior top cap of high temperature electrostatic precipitator 1, and the lower port of insulator 12 contacts with interior top cap, goes up the port and contacts with the 12 backup pad of insulator. The air inlet end of the hot air pipe 11 is connected with the outlet of the electric heater 4, the winding mode of the hot air pipe 11 is arranged on the outer surface of the round table formed by the insulator 12, so that the insulator 12 is uniformly heated, and the outlet of the hot air pipe 11 is connected with the second smoke outlet of the high-temperature electric dust collector 1 through a pipeline.
In the embodiment of the invention, the electric heater 4 mainly functions to heat the high-temperature clean flue gas after dust removal, so as to obtain the heated high-temperature clean flue gas.
It should be noted that, in practical application, the temperature of the insulator chamber 9 of the conventional hot air purging system for the electric precipitator insulator 12 is technically required to be higher than the acid dew point of the flue gas. The temperature of the high-temperature clean flue gas after dust removal by the high-temperature electric dust remover 1 is higher and is generally between 250 ℃ and 650 ℃; the temperature of the acid dew point of the flue gas is between 180 and 300 ℃, so that the temperature difference between the high-temperature clean flue gas temperature after dust removal and the temperature in the insulator chamber 9 can reach as high as 300 ℃, and the high-temperature dust-containing flue gas is lifted to enter the insulator chamber 9 by the pressure difference caused by the temperature difference, so that the insulation aging of the insulator 12 is caused; if the power of the electric heater 4 arranged in the insulator chamber 9 is directly increased to increase the temperature of the insulator chamber 9 from normal temperature to a temperature higher than the temperature of the flue gas treated by the high-temperature electric dust remover 1, a large amount of electric energy is consumed.
In the embodiment of the invention, the electric heater 4 is arranged outside the high-temperature electric dust remover 1 and the insulator chamber 9, so that the high-temperature clean flue gas after dust removal can be heated again, the temperature of the heated high-temperature clean flue gas entering the insulator chamber 9 is higher than that of the high-temperature clean flue gas after dust removal, the problem that the dust-containing flue gas is lifted to enter the insulator chamber due to the large temperature difference between the insulator chamber and the dust remover body in the high-temperature electric dust removal technology is solved, and meanwhile, hot air blowing formed by negative pressure operation of the electric dust remover is coupled, the dust-containing flue gas is effectively prevented from being lifted to enter the insulator chamber, and the continuous and efficient operation of the high-temperature electric dust remover is ensured.
Illustratively, as shown in fig. 1, the hot air purging system further includes a first temperature sensor 2, a second temperature sensor 6, an induced draft fan 3 and a control system 5. Specifically, the one end of draught fan 3 is connected with the first exhanst gas outlet of high temperature electrostatic precipitator 1, and the other end is connected with electric heater 4's inlet end, and draught fan 3 is used for introducing the 3 pipelines of draught fan and transmitting to electric heater 4 with the high temperature clean flue gas after high temperature electrostatic precipitator 1 removes dust. In practical application, the first temperature sensor 2 is arranged at the air inlet end of the induced draft fan 3 and used for determining the first temperature of the high-temperature clean flue gas after dust removal; a second temperature sensor 6 is arranged in the insulator chamber 9 for determining a second temperature in the insulator chamber 9; meanwhile, the first temperature sensor 2, the second temperature sensor 6 and the electric heater 4 are respectively electrically connected with the control system 5, and the control system 5 is used for controlling the electric heater 4 to heat the high-temperature clean flue gas after dust removal according to the temperature difference between the first temperature and the second temperature.
It should be noted that, in the embodiment of the present invention, the first temperature of the high-temperature clean flue gas after dust removal, which is determined by the first temperature sensor, is the same as the temperature of the flue gas processed by the high-temperature electric dust remover, and therefore, the first temperature may be represented by the temperature of the high-temperature clean flue gas after dust removal, or may be represented by the temperature of the flue gas processed by the high-temperature electric dust remover.
In the embodiment of the invention, the electric heater 4 heats the high-temperature clean flue gas after dust removal, and the temperature of the obtained heated high-temperature clean flue gas is higher than that of the high-temperature clean flue gas after dust removal. It should be noted that, because the air outlet end of the electric heater 4 is connected with the air inlet end of the hot air pipe 11, in order to avoid the problem that the temperature difference between the insulator chamber 9 and the dust remover body in the high-temperature electric dust removal technology is large, which causes the dust-containing flue gas to be lifted and enter the insulator chamber 9, preferably, the temperature of the heated high-temperature clean flue gas entering the hot air pipe 11 can make the temperature of the insulator chamber 9 higher than the temperature of the high-temperature clean flue gas after dust removal by 3-5 ℃.
Illustratively, as shown in fig. 2 and fig. 3, the support plate of the insulator 12 is provided with an inclined diversion hole 701, a vertical diversion hole 702, and a hanging hole 703, in practical applications, the inclined diversion hole 701, the vertical diversion hole 702, and the hanging hole 703 are all arranged in a concentric circle with the insulator support plate 7, and a distance between the vertical diversion hole 702 and a circle point of the concentric circle is smaller than a distance between the inclined diversion hole 701 and a circle point diameter of the concentric circle, that is, the inclined diversion hole 701 is located at the periphery of the vertical diversion hole 702.
Furthermore, the hanging hole 703 is used for arranging a hanging rod 15, one end of the hanging rod 15 passes through the hanging hole 703, and the hanging can be fixed at the upper end of the insulator supporting plate 7 through the fastener 8 due to the fact that the upper end of the hanging rod 15 is provided with threads; the other end of the hanger rod 15 extends through the inner roof cover into the high temperature electric precipitator 1. In practical applications, in order to seal the insulator 12 support plate and the hanger, a gasket is preferably further disposed between the fastener 8 and the insulator 12 support plate.
It should be noted that the hanging hole 703 is located at the center of the support plate of the insulator 12, that is, the inclined diversion hole 701 and the vertical diversion hole 702 are both concentrically arranged around the hanging hole 703.
In the embodiment of the invention, the thickness of the insulator supporting plate 7 is 25 mm-30 mm, and the material is Q345-B, namely common carbon structural steel. Furthermore, 4 vertical diversion holes 702 and 8 inclined diversion holes 701 are arranged on the insulator 12 support plate, it should be noted that the vertical diversion holes 702 are arranged at the radius of the insulator 12 support plate 1/3, and the inclined diversion holes 701 are arranged at the radius of the insulator 12 support plate 2/3; further, the diameter of the vertical guide hole 702 and the inclined guide hole 701 provided on the insulation to support plate is between 8mm and 12 mm. Through the arrangement, hot air formed by the negative pressure operation of the electric dust collector can sweep the inner wall of the insulator 12 and the suspender 15;
in practical applications, when the insulator supporting plate 7 is processed, in order to prevent partial corona discharge, it is necessary to keep all surfaces of the supporting plate of the insulator 12 smooth, i.e. remove burrs on all surfaces and at the openings.
Further, in order to facilitate the installation and positioning of the insulator 12 and improve the sealing performance between the insulator 12 and the insulator 12 support plate, it is preferable that a boss is provided at the lower end of the insulator support plate 7, wherein the diameter of the insulator support plate 7 is larger than the outer diameter of the upper port of the insulator 12, and the inner diameter of the upper port of the insulator 12 is larger than the diameter of the boss. Through the arrangement, the installation of the insulator 12 is facilitated, and meanwhile, the sealing performance between the upper port of the insulator 12 and the support plate of the insulator 12 can be improved through the lug boss.
Further, in order to ensure that the hot air can blow the insulator 12 against the truncated cone-shaped inner wall, preferably, the opening angle of the inclined diversion hole 701 arranged on the support plate of the insulator 12 is between 10 ° and 25 °. The opening angle of the inclined guiding hole 701 is shown as an angle α in fig. 4.
Further, in order to ensure that the high-voltage and low-voltage insulation distance exists between the hot air pipe 11 and the insulator 12 support plate, preferably, the straight distance between the hot air pipe 11 and the insulator 12 support plate needs to be greater than the different polar distance of the electric field structure of the electric dust collector. The straight line distance between the hot air duct 11 and the insulator 12 support plate is shown as a distance β in fig. 4.
Further, in order to avoid a gap between the upper end of the truncated cone-shaped insulator 12 and the support plate of the insulator 12 and a gap between the lower end of the truncated cone-shaped insulator 12 and the inner top cover, it is preferable to further include a gasket, wherein the gasket is disposed between the upper end of the truncated cone-shaped insulator 12 and the lower end of the support plate of the insulator 12, and the gasket is disposed between the lower end of the truncated cone-shaped insulator 12 and the inner top cover. In the embodiment of the invention, the sealing gasket can be made of graphite packing or asbestos packing. If the material of the gasket is graphite packing, the graphite packing cannot be immersed in oil.
For example, the material of the insulator 12 provided in the embodiment of the present invention may be selected according to the temperature of the flue gas, and in one way, for the flue gas above 250 ℃, the material of the insulator 12 must be 95 porcelain (95% alumina); in special cases, 99 porcelain (99% alumina) with better electric resistance can be selected; alternatively, to prevent thermal breakdown of the insulator 12, the insulator 12 is made of 95 porcelain t e The value (temperature when the resistivity of the material drops to 1 M.OMEGA.. cm) was 1000 ℃ and 99 porcelain t e The value is 1170 ℃.
Exemplarily, a dust cover 14 is further arranged between the insulator chamber 9 and the high-temperature electric dust collector 1, specifically, the dust cover 14 is arranged between the high-temperature electric dust collector 1 and the inner top cover and is welded and fixed on the inner top cover, the dust cover 14 is concentrically arranged with the hanger rod 15 and the insulator 12 support plate which penetrate through the insulator 12 support plate, and partial charged dust can be effectively trapped by arranging the dust cover 14 on the high-temperature electric dust collector 1. In the embodiment of the present invention, the dust cover 14 is made of ordinary carbon structural steel (Q235-B), the ordinary carbon structural steel forms a cylindrical barrel, that is, the dust cover 14 is shaped as a cylindrical barrel, the diameter of the cylindrical barrel is 400-600 mm, the insulation distance is ensured to be greater than 400mm, and the thickness of the barrel wall of the cylindrical barrel is 3-5 mm.
In an example, the hot air duct 11 provided by the embodiment of the present invention is made of ordinary carbon structural steel, and has a specification of phi 10 × 2, and the inner wall of the hot air duct 11 is coated with an anticorrosive layer. In the embodiment of the invention, the heat exchange area of the hot air pipe 11 needs to be determined by heat balance, the insulator 12 is uniformly heated, and the temperature of the insulator chamber 9 is 3-5 ℃ higher than the flue gas treatment temperature of the dust remover, so that the problem that the heavy flue gas is lifted into the insulator chamber 9 due to the fact that the flue gas treatment temperature of the high-temperature electric dust remover 1 is far higher than the temperature of the insulator chamber 9 is thoroughly solved, and the high-temperature sealing effect of the insulator chamber 9 is formed. Further, an insulating layer 12 is provided on the housing 11 of the insulator chamber 9.
The specification of the hot air duct 11 indicates that the hot air duct 11 has an outer diameter of 10mm and a wall thickness of 2 mm.
In order to more clearly describe the high-temperature sealing coupling hot air purging system for the insulator of the high-temperature electric precipitator provided by the embodiment of the invention, the working mode of the high-temperature sealing coupling hot air purging system for the insulator of the high-temperature electric precipitator is described as follows: the high-temperature electric dust remover 1 removes dust of high-temperature clean flue gas efficiently, a first flue gas outlet of the high-temperature electric dust remover 1 is led out through an induced draft fan 3, a first temperature sensor 2 arranged between the induced draft fan 3 and the first flue gas outlet of the high-temperature electric dust remover is used for determining the first temperature of the high-temperature clean flue gas after dust removal and sending the first temperature to a control system 5, meanwhile, a second temperature sensor 6 arranged in an insulator chamber 9 is used for determining the second temperature of the insulator chamber 9 and sending the second temperature to the control system 5, and the control system 5 adjusts the power of an electric heater 4 to further heat and raise the temperature of the high-temperature clean flue gas after dust removal according to the second temperature and the first temperature; the air inlet end of the hot air pipe 11 is connected with the air outlet of the electric heater 4, the hot air pipe 11 is wound on a round table insulator 12 with an upper opening and a lower opening, under the action of the heat effect of the hot air pipe 11, the insulator 12 can be uniformly heated, the temperature of the insulator chamber 9 is higher than that of high-temperature clean flue gas after dust removal of the high-temperature electric dust remover 1, under general conditions, the temperature of the insulator chamber 9 is 3-5 ℃ higher than that of the electric dust remover, the heated high-temperature clean flue gas entering the insulator chamber 9 forms clean flue gas after heat exchange through the hot air pipe 11, the clean flue gas passes through the outlet of the hot air pipe 11 and is returned to the second flue gas outlet of the high-temperature electric dust remover 1, the pressure difference caused by the temperature difference enables the high-temperature clean flue gas after dust removal not to rise and enter the insulator chamber 9 to form the high-temperature sealing effect of the insulator chamber 9, and meanwhile, the insulator supporting plate 7 is provided with a vertical flow guiding hole 702 and an inclined flow guiding hole 701, the high-temperature electric dust collector 1 operates under negative pressure to form hot air to sweep the inner wall of the insulator 12 and the suspender 15. Insulator 12 high temperature seal coupling is swept hot-blastly, can prevent effectively that dusty flue gas from getting into insulator chamber 9, ensures high temperature electrostatic precipitator 1 and realizes lasting high-efficient operation, has reduced the replacement cost of insulator 12 by a wide margin, utilizes the clean flue gas waste heat of dust remover export simultaneously, reduces investment and use cost, has apparent energy-conserving benefit.
To sum up, the high-temperature sealing coupling hot air purging system for insulators of the high-temperature electric precipitator in the embodiment of the invention comprises: the air inlet end of the electric heater is connected with the first flue gas outlet of the high-temperature electric dust remover and is used for heating the high-temperature clean flue gas after dust removal of the high-temperature electric dust remover so that the temperature of the heated high-temperature clean flue gas is higher than that of the high-temperature clean flue gas after dust removal; the upper opening and the lower opening of the insulator are arranged on an inner top cover of the high-temperature electric dust collector in a circular truncated cone shape, the lower port of the insulator is contacted with the inner top cover, and the upper port of the insulator is contacted with an insulator supporting plate; the air inlet end of the hot air pipe is connected with the outlet of the electric heater, the hot air pipe is arranged on the outer surface of the insulator in a winding mode, and the outlet of the hot air pipe is connected with the second smoke outlet of the high-temperature electric dust remover through a pipeline. This system passes through electric heater, can heat the clean flue gas of high temperature after removing dust once more, make the temperature that gets into the clean flue gas of high temperature after the heating of insulator room be higher than the temperature of the clean flue gas of high temperature after removing dust, eliminate the dust-laden flue gas lifting that the big result in of high temperature electrostatic precipitator technique insulator room and dust remover body difference in temperature and get into the problem of insulator room, the hot-blast sweeping that coupling electrostatic precipitator negative pressure operation formed simultaneously, dust-laden flue gas lifting has effectively been prevented from getting into the insulator room, guarantee that high temperature electrostatic precipitator realizes lasting high-efficient operation.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a hot-blast system that sweeps of high temperature electrostatic precipitator insulator high temperature seal coupling which characterized in that includes:
the air inlet end of the electric heater is connected with the first flue gas outlet of the high-temperature electric dust remover and is used for heating the high-temperature clean flue gas after dust removal of the high-temperature electric dust remover so that the temperature of the heated high-temperature clean flue gas is higher than that of the high-temperature clean flue gas after dust removal;
the upper opening and the lower opening of the insulator are arranged on the inner top cover of the high-temperature electric dust collector in a circular truncated cone shape, the lower port of the insulator is contacted with the inner top cover, and the upper port of the insulator is contacted with the insulator supporting plate; the air inlet end of the hot air pipe is connected with the outlet of the electric heater, the hot air pipe is arranged on the outer surface of the insulator in a winding mode, and the outlet of the hot air pipe is connected with the second smoke outlet of the high-temperature electric dust remover through a pipeline.
2. The insulator high-temperature sealing coupling hot air blowing system according to claim 1, wherein an inclined diversion hole, a vertical diversion hole and a hanging hole are formed in the insulator supporting plate;
the vertical diversion holes, the inclined diversion holes and the hanging holes are all arranged concentrically with the insulator supporting plate, and the distance between the vertical diversion holes and the round points of the concentric circles is smaller than the distance between the inclined diversion holes and the diameters of the round points of the concentric circles;
the hanging hole is used for arranging a hanging rod, one end of the hanging rod penetrates through the hanging hole and is fixed at the upper end of the insulator supporting plate, and the other end of the hanging rod penetrates through the inner top cover and extends into the high-temperature electric dust collector.
3. The insulator high-temperature sealing coupling hot air blowing system according to claim 2, wherein a boss is provided at a lower end of the insulator support plate, a diameter of the insulator support plate is larger than an outer diameter of the insulator upper port, and an inner diameter of the insulator upper port is larger than a diameter of the boss.
4. The insulator high-temperature sealing coupling hot air blowing system according to claim 2, wherein the thickness of the insulator supporting plate is 25mm to 30 mm;
the vertical diversion holes are arranged at the radius of the insulator supporting plate 1/3 and comprise 4;
the inclined diversion holes are arranged at the radius of the insulator supporting plate 2/3 and comprise 8;
the aperture of the vertical diversion hole and the aperture of the inclined diversion hole are between 8mm and 12 mm.
5. The insulator high-temperature seal coupling thermal purging system of claim 4, wherein the opening angle of the inclined diversion hole is between 10 ° and 25 °.
6. The insulator high-temperature sealing coupling hot air purging system according to claim 1, further comprising a sealing gasket, wherein the sealing gasket is arranged between the lower port of the insulator and the inner top cover, and the sealing gasket is arranged between the upper port of the insulator and the insulator supporting plate;
the sealing gasket is made of graphite packing.
7. The insulator high-temperature sealing coupling hot air purging system as claimed in claim 1, further comprising a dust cover, which is arranged at the lower part of the top cover in the high-temperature electric precipitator and welded, and is concentrically arranged with the hanger rod penetrating through the insulator support plate;
the dust cover is made of common carbon structural steel, the dust cover is in the shape of a cylindrical barrel, the diameter of the cylindrical barrel is 440-600 mm, the height of the cylindrical barrel is 450-550 mm, and the thickness of the barrel wall is 3-5 mm.
8. The insulator high-temperature sealing coupling hot air blowing system according to claim 1, wherein the hot air pipe has a specification of phi 10 x 2 and is made of common carbon structural steel.
9. The insulator high-temperature sealing coupling hot air purging system according to claim 1, further comprising a controller, a first temperature sensor, a second temperature sensor and an induced draft fan;
one end of the induced draft fan is connected with a first flue gas outlet of the high-temperature electric dust collector, and the other end of the induced draft fan is connected with the air inlet end of the electric heater;
the first temperature sensor is arranged at the air inlet end of the induced draft fan and used for determining the first temperature of the high-temperature clean flue gas after dust removal of the high-temperature electric dust remover;
the second temperature sensor is arranged in the insulator chamber and used for determining a second temperature in the insulator chamber;
the first temperature sensor, the second temperature sensor and the electric heater are electrically connected with the controller respectively.
The controller is used for determining that the electric heater heats the high-temperature clean flue gas after dust removal according to the temperature difference between the first temperature and the second temperature.
10. The insulator high-temperature sealing coupling hot air purging system as claimed in claim 9, wherein the second temperature is 3-5 ℃ higher than the first temperature, and the first temperature is consistent with the temperature of flue gas treated by the high-temperature electric precipitator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210567531.3A CN115025880A (en) | 2022-05-23 | 2022-05-23 | High-temperature sealing coupling hot air purging system for high-temperature electric precipitator insulator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210567531.3A CN115025880A (en) | 2022-05-23 | 2022-05-23 | High-temperature sealing coupling hot air purging system for high-temperature electric precipitator insulator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115025880A true CN115025880A (en) | 2022-09-09 |
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ID=83121275
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210567531.3A Pending CN115025880A (en) | 2022-05-23 | 2022-05-23 | High-temperature sealing coupling hot air purging system for high-temperature electric precipitator insulator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115025880A (en) |
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2022
- 2022-05-23 CN CN202210567531.3A patent/CN115025880A/en active Pending
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