A high temperature sealed coupled hot air blowing system for high temperature electric precipitator insulators

Abstract

The present invention discloses a high-temperature sealed coupled hot air purge system for high-temperature electrostatic precipitator insulators, and relates to the technical field of air pollution control. The system solves the problem that the dust-containing flue gas is lifted into the insulator chamber due to the pressure difference caused by the high temperature difference between the insulator chamber and the flue gas treated by the precipitator, resulting in aging of the insulator insulation. The system comprises: an electric heater, whose air inlet end is connected to the first flue gas outlet of the high-temperature electrostatic precipitator, and is used to heat the high-temperature clean flue gas after dust removal by the high-temperature electrostatic precipitator, so that the temperature of the heated high-temperature clean flue gas is higher than the temperature of the high-temperature clean flue gas after dust removal; an insulator, whose upper and lower openings are arranged in a truncated cone shape on the inner top cover of the high-temperature electrostatic precipitator, whose lower port contacts the inner top cover, and whose upper port contacts the insulator support plate; a hot air duct, whose air inlet end is connected to the outlet of the electric heater, which is arranged on the outer surface of the insulator in a winding manner, and whose outlet is connected to the second flue gas outlet of the high-temperature electrostatic precipitator through a pipeline.

Description

Technical Field

[0001] The present invention relates to the field of atmospheric pollutant treatment, and more specifically to a high-temperature sealed coupled hot air blowing system for a high-temperature electric precipitator insulator. Background Art

[0002] High-temperature electrostatic dust removal technology can achieve high-efficiency dust removal of high-temperature gases, and is of great significance to dust control in industries such as cement, glass, steel, petrochemicals, nonferrous metals, phosphorus furnace gas, coal pyrolysis, and cement kiln bypass air purification. Due to different process requirements, whether it is to recover energy or to meet environmental emission standards, it is necessary to remove dust from the high-temperature dusty flue gas in the process system to achieve high-temperature flue gas purification.

[0003] Insulators are key components for establishing and maintaining the high-voltage electric field of electrostatic precipitators. Under the combined effects of the electric field and the temperature field, thermal breakdown and insulation aging of insulators are the main forms of insulation failure. With the successful development of high-temperature electrical performance materials and further optimization of their performance, the selection of materials with good high-temperature electrical performance can effectively prevent thermal breakdown of insulators. Studies have shown that 85 porcelain, 90 porcelain, 95 porcelain and 99 porcelain t e The value can reach 850℃, 960℃, 1000℃ and 1170℃ (the temperature when the material resistivity drops to 1MΩ·cm). However, insulation aging of insulators occurs from time to time, forcing the owner to shut down for maintenance and invest a lot of costs. Insulation aging of insulators occurs when the local electric field of the gas with low dielectric strength and the dust adsorbed on the surface of the insulator reaches the starting corona field strength, causing local corona discharge. Long-term operation will cause insulation aging of the insulator, affecting the normal operation of the electrostatic precipitator.

[0004] Today's high-temperature electrostatic precipitator insulator protection system draws on the hot air purge system of the insulator chamber of the electrostatic precipitator in coal-fired power plants. The hot air purge temperature can be higher than the flue gas acid dew point temperature, and the temperature difference between the insulator chamber and the treated flue gas temperature is not large. However, the high-temperature electrostatic precipitator treats high flue gas temperature (250℃~650℃), and the electric heating temperature of the insulator chamber is still only heated to above the flue gas acid dew point temperature (180℃~300℃). The temperature difference between the treated flue gas temperature and the insulator chamber temperature is up to 300℃. The pressure difference caused by the temperature difference between the insulator chamber and the flue gas treated by the precipitator causes the dust-containing flue gas to rise, which is not enough to overcome the hot air purge formed by the negative pressure operation of the precipitator. The dust-containing flue gas rises and enters the insulator chamber. The gas with low electrical strength and the dust attached to the inner surface of the insulator form local corona discharge, which causes insulation aging of the insulator for a long time and affects the normal operation of the electrostatic precipitator. Summary of the invention

[0005] The embodiment of the present invention provides a high-temperature sealed coupled hot air blowing system for a high-temperature electrostatic precipitator insulator, which is used to solve the problem that the pressure difference caused by the temperature difference between the insulator chamber and the flue gas treated by the precipitator in the existing high-temperature electrostatic precipitator causes the dust-containing flue gas to rise into the insulator chamber, resulting in local corona discharge of gas with low electrical strength and dust attached to the inner surface of the insulator, causing insulation aging of the insulator.

[0006] The embodiment of the present invention provides a high-temperature sealed coupled hot air blowing system for a high-temperature electric precipitator insulator, comprising:

[0007] An electric heater, whose air inlet end is connected to the first flue gas outlet of the high-temperature electrostatic precipitator, is used to heat the high-temperature clean flue gas after dust removal by the high-temperature electrostatic precipitator, so that the temperature of the heated high-temperature clean flue gas is higher than the temperature of the high-temperature clean flue gas after dust removal;

[0008] An insulator, whose upper and lower openings are in a truncated cone shape and are arranged on the inner top cover of the high-temperature electrostatic precipitator, wherein the lower port contacts the inner top cover and the upper port contacts the insulator support plate; a hot air duct, whose air inlet end is connected to the outlet of the electric heater, is arranged on the outer surface of the insulator in a winding manner, and whose outlet is connected to the second flue gas outlet of the high-temperature electrostatic precipitator through a pipeline.

[0009] Preferably, the insulator support plate is provided with inclined guide holes, vertical guide holes and hanging holes;

[0010] The vertical guide hole, the inclined guide hole and the hanging hole are all arranged concentrically with the insulator support plate, and the distance between the vertical guide hole and the point of the concentric circle is smaller than the distance between the inclined guide hole and the diameter of the point of the concentric circle;

[0011] The hanging hole is used to set a hanging rod, one end of the hanging rod passes through the hanging hole and is fixed to the upper end of the insulator support plate, and the other end passes through the inner top cover and extends into the high-temperature electric precipitator.

[0012] Preferably, a boss is provided at the lower end of the insulator support plate, the diameter of the insulator support 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.

[0013] Preferably, the thickness of the insulator support plate is between 25 mm and 30 mm;

[0014] The vertical guide holes are arranged at 1 / 3 radius of the insulator support plate, and include 4 of them;

[0015] The inclined guide holes are arranged at 2 / 3 of the radius of the insulator support plate, and include 8 of them;

[0016] The apertures of the vertical guide holes and the inclined guide holes are between 8 mm and 12 mm.

[0017] Preferably, the opening angle of the inclined guide hole is between 10° and 25°.

[0018] Preferably, it further comprises a sealing gasket, which is arranged between the lower port of the insulator and the inner top cover, and between the upper port of the insulator and the insulator support plate;

[0019] The sealing gasket is made of graphite packing.

[0020] Preferably, it also includes a dust cover, which is arranged at the lower part of the top cover of the high-temperature electric precipitator and welded, and is concentrically arranged with the suspension rod penetrating the insulator support plate;

[0021] The material of the dust cover is common carbon structural steel, and the shape of the dust cover is a cylindrical body, the diameter of the cylindrical body is 400-600mm, the height is 450-550mm, and the thickness of the cylinder wall is between 3mm and 5mm.

[0022] Preferably, the diameter of the dust cover cylinder is consistent with the diameter of the inner top cover opening and the lower port of the insulator to form a through hole.

[0023] Preferably, the specification of the hot air pipe is φ10×2, and its material is ordinary carbon structural steel.

[0024] Preferably, it also includes a controller, a first temperature sensor, a second temperature sensor and an induced draft fan;

[0025] One end of the induced draft fan is connected to the first flue gas outlet of the high-temperature electric precipitator, and the other end is connected to the air inlet end of the electric heater;

[0026] The first temperature sensor is arranged at the air inlet end of the induced draft fan and is used to determine the first temperature of the high-temperature clean flue gas after dust removal by the high-temperature electrostatic precipitator;

[0027] The second temperature sensor is disposed in the insulator chamber and is used to determine a second temperature in the insulator chamber;

[0028] The first temperature sensor, the second temperature sensor and the electric heater are electrically connected to the controller respectively.

[0029] The controller is used to determine 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.

[0030] Preferably, the second temperature is 3-5° C. higher than the first temperature, wherein the first temperature is consistent with the temperature of flue gas treated by the high-temperature electrostatic precipitator.

[0031] In an embodiment of the present invention, a high-temperature sealed coupled hot air blowing system for an insulator of a high-temperature electrostatic precipitator comprises: an electric heater, an air inlet end of which is connected to a first flue gas outlet of the high-temperature electrostatic precipitator, and is used to heat the high-temperature clean flue gas after dust removal by the high-temperature electrostatic precipitator, so that the temperature of the heated high-temperature clean flue gas is higher than the temperature of the high-temperature clean flue gas after dust removal; an insulator, upper and lower openings of which are arranged in a truncated cone shape on an inner top cover of the high-temperature electrostatic precipitator, a lower port of which is in contact with the inner top cover, and an upper port of which is in contact with an insulator support plate; a hot air duct, an air inlet end of which is connected to the outlet of the electric heater, which is arranged on the outer surface of the insulator in a winding manner, and an outlet of which is connected to the second flue gas outlet of the high-temperature electrostatic precipitator through a pipeline. The system can reheat the high-temperature clean flue gas after dust removal through an electric heater, so that the temperature of the heated high-temperature clean flue gas entering the insulator is higher than that of the high-temperature clean flue gas after dust removal, eliminating the problem of dust-containing flue gas rising into the insulator chamber due to the large temperature difference between the insulator chamber and the dust collector body of the high-temperature electrostatic precipitator technology. At the same time, the hot air purge formed by the negative pressure operation of the electrostatic precipitator is coupled to effectively prevent the dust-containing flue gas from rising into the insulator chamber, ensuring the continuous and efficient operation of the high-temperature electrostatic precipitator. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 It is a structural schematic diagram of a high-temperature sealed coupled hot air blowing system for a high-temperature electric precipitator insulator provided by an embodiment of the present invention;

[0034] Figure 2 is a schematic cross-sectional view of an insulator support plate provided by an embodiment of the present invention;

[0035] Figure 3 The embodiment of the present invention provides Figure 2 The schematic diagram of the insulator support plate in the direction of B is shown;

[0036] Figure 4 The embodiment of the present invention provides Figure 1 A local enlarged schematic diagram;

[0037] Wherein: 1. high-temperature electrostatic precipitator; 2. first temperature sensor; 3. induced draft fan; 4. electric heater; 5. control system; 6. second temperature sensor; 7. insulator support plate; 701. inclined guide hole; 702. vertical guide hole; 703. hanging hole; 704. insulator boss; 8. fastener; 9. insulator chamber; 901: shell; 902: insulation layer; 10. sealing device; 11. hot air duct; 12. insulator; 13. inner top cover of precipitator; 14. dust cover; 15. suspension rod. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Figure 1 It is a structural schematic diagram of a high-temperature sealed coupled hot air blowing system for a high-temperature electric precipitator insulator provided by an embodiment of the present invention; Figure 2 is a schematic cross-sectional view of an insulator support plate provided by an embodiment of the present invention; Figure 3 The embodiment of the present invention provides Figure 2 The schematic diagram of the insulator support plate in the direction of B is shown; Figure 4 The embodiment of the present invention provides Figure 1 A local enlarged schematic diagram, the following combined Figure 1 to Figure 4 , a hot air blowing system provided by an embodiment of the present invention is introduced in detail.

[0040] like Figure 1 As shown, the hot air blowing system provided by the embodiment of the present invention mainly includes: an electric heater 4, an insulator 12, a hot air pipe 11 and a high-temperature electrostatic precipitator 1. Among them, the insulator 12 and the hot air pipe 11 are arranged in the insulator chamber 9, and the insulator chamber 9 is located directly above the high-temperature electrostatic precipitator 1, and the electric heater 4 is arranged outside the insulator chamber 9 and the high-temperature electrostatic precipitator 1.

[0041] Specifically, one end of the high-temperature electrostatic precipitator 1 is a flue gas inlet, and the other end includes a first flue gas outlet and a second flue gas outlet. The electric heater 4 includes an air inlet end connected to the first flue gas outlet of the high-temperature electrostatic precipitator 1, and the high-temperature clean flue gas from the high-temperature electrostatic precipitator 1 after dust removal passes through the air inlet end of the electric heater 4. The insulator 12 has a truncated cone shape at the upper and lower openings. Since the insulator chamber 9 is arranged directly above the high-temperature electrostatic precipitator 1, and the insulator 12 is arranged in the insulator chamber 9, the insulator 12 is arranged on the inner top cover of the high-temperature electrostatic precipitator 1, and the lower port of the insulator 12 is in contact with the inner top cover, and the upper port is in contact with the support plate of the insulator 12. The hot air pipe 11 has an air inlet end connected to the outlet of the electric heater 4, and the hot air pipe 11 is arranged in a winding manner on the truncated cone-shaped outer surface formed by the insulator 12, so that the insulator 12 is evenly heated, and the outlet of the hot air pipe 11 is connected to the second flue gas outlet of the high-temperature electrostatic precipitator 1 through a pipeline.

[0042] In the embodiment of the present invention, the main function of the electric heater 4 is to heat the high-temperature clean flue gas after dust removal to obtain heated high-temperature clean flue gas.

[0043] It should be noted that in practical applications, the traditional hot air blowing system for the insulator 12 of the electrostatic precipitator technically requires that the temperature of the insulator chamber 9 is higher than the flue gas acid dew point. Since the temperature of the high-temperature clean flue gas after the dust removal of the high-temperature electrostatic precipitator 1 is relatively high, generally between 250°C and 650°C; and the temperature of the flue gas acid dew point is between 180°C and 300°C, it can be seen that the temperature difference between the temperature of the high-temperature clean flue gas after dust removal and the temperature in the insulator chamber 9 is up to 300°C. The pressure difference caused by the temperature difference causes the high-temperature dusty flue gas to rise into the insulator chamber 9, causing the insulation aging of the insulator 12; if the power of the electric heater 4 set in the insulator chamber 9 is directly increased to make the temperature of the insulator chamber 9 rise from normal temperature to higher than the flue gas temperature treated by the high-temperature electrostatic precipitator 1, a large amount of electric energy will be consumed.

[0044] In the embodiment of the present invention, an electric heater 4 is arranged outside the high-temperature electrostatic precipitator 1 and the insulator chamber 9, so that the high-temperature clean flue gas after dust removal can be heated again, so that the temperature of the heated high-temperature clean flue gas entering the insulator chamber 9 is higher than the temperature of the high-temperature clean flue gas after dust removal, thereby eliminating the problem of dust-containing flue gas rising into the insulator chamber due to the large temperature difference between the insulator chamber and the precipitator body of the high-temperature electrostatic precipitator technology. At the same time, the hot air purge formed by the negative pressure operation of the electrostatic precipitator is coupled to effectively prevent the dust-containing flue gas from rising into the insulator chamber, thereby ensuring the continuous and efficient operation of the high-temperature electrostatic precipitator.

[0045] For example, Figure 1As shown, the hot air blowing system also includes a first temperature sensor 2, a second temperature sensor 6, an induced draft fan 3 and a control system 5. Specifically, one end of the induced draft fan 3 is connected to the first flue gas outlet of the high-temperature electrostatic precipitator 1, and the other end is connected to the air inlet end of the electric heater 4. The induced draft fan 3 is used to introduce the high-temperature clean flue gas after the high-temperature electrostatic precipitator 1 is dedusted into the induced draft fan 3 pipeline and transmit it to the electric heater 4. In practical applications, the first temperature sensor 2 is arranged at the air inlet end of the induced draft fan 3, and is used to determine the first temperature of the high-temperature clean flue gas after dedusting; the second temperature sensor 6 is arranged in the insulator chamber 9, and is used to determine the second temperature in the insulator chamber 9; at the same time, the first temperature sensor 2, the second temperature sensor 6 and the electric heater 4 are electrically connected to the control system 5 respectively, and the control system 5 is used to control the electric heater 4 to heat the high-temperature clean flue gas after dedusting according to the temperature difference between the first temperature and the second temperature.

[0046] 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 determined by the first temperature sensor is the same as the temperature of the flue gas treated by the high-temperature electrostatic precipitator. Therefore, the above-mentioned first temperature can represent the temperature of the high-temperature clean flue gas after dust removal, and can also be expressed as the temperature of the flue gas treated by the high-temperature electrostatic precipitator.

[0047] In the embodiment of the present 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 since the air outlet of the electric heater 4 is connected to the air inlet of the hot air pipe 11, in order to avoid the problem of dust-containing flue gas rising into the insulator chamber 9 due to the large temperature difference between the insulator chamber 9 and the dust collector body of the high-temperature electrostatic precipitator technology, preferably, the heated high-temperature clean flue gas entering the hot air pipe 11 can make the temperature of the insulator chamber 9 higher than that of the high-temperature clean flue gas after dust removal by 3°C to 5°C.

[0048] For example, Figure 2 and Figure 3 As shown, the insulator 12 support plate is provided with an inclined guide hole 701, a vertical guide hole 702 and a hanging hole 703. In actual application, the inclined guide hole 701, the vertical guide hole 702 and the hanging hole 703 are all arranged in concentric circles with the insulator support plate 7, and the distance between the vertical guide hole 702 and the point of the concentric circle is smaller than the distance between the inclined guide hole 701 and the diameter of the point of the concentric circle, that is, the inclined guide hole 701 is located outside the vertical guide hole 702.

[0049] Furthermore, the hanging hole 703 is used to set the hanging rod 15, one end of the hanging rod 15 passes through the hanging hole 703, and since the upper end of the hanging rod 15 is provided with a thread, the hanging rod 15 can be fixed to the upper end of the insulator support plate 7 through the fastener 8; the other end of the hanging rod 15 passes through the inner top cover and extends into the high-temperature electric precipitator 1. In practical applications, in order to be able to seal the insulator 12 support plate and the hanging rod, preferably, a sealing gasket is also provided between the fastener 8 and the insulator 12 support plate.

[0050] It should be noted that the hanging hole 703 is located at the center of the supporting plate of the insulator 12 , that is, the inclined guide hole 701 and the vertical guide hole 702 are both arranged concentrically with the hanging hole 703 as the center.

[0051] In the embodiment of the present invention, the thickness of the insulator support plate 7 is between 25mm and 30mm, and the material thereof is Q345-B, i.e., ordinary carbon structural steel. Furthermore, four vertical guide holes 702 and eight inclined guide holes 701 are arranged on the insulator 12 support plate. It should be noted that the vertical guide holes 702 are arranged at 1 / 3 of the radius of the insulator 12 support plate, and the inclined guide holes 701 are arranged at 2 / 3 of the radius of the insulator 12 support plate; further, the apertures of the vertical guide holes 702 and the inclined guide holes 701 arranged on the insulator support plate are between 8mm and 12mm. Through the above arrangement, the hot air formed by the negative pressure operation of the electrostatic precipitator can blow the inner wall of the insulator 12 and the suspension rod 15;

[0052] In practical applications, when the insulator support plate 7 is being processed, in order to prevent local corona discharge, it is necessary to keep all surfaces of the insulator 12 support plate smooth, that is, to remove burrs from all surfaces and openings.

[0053] Furthermore, in order to facilitate the installation and positioning of the insulator 12 and improve the sealing between the insulator 12 and the insulator 12 support plate, preferably, 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 above arrangement, while facilitating the installation of the insulator 12, the boss can also improve the sealing between the upper port of the insulator 12 and the insulator 12 support plate.

[0054] Furthermore, in order to ensure that the hot air can blow directly toward the inner wall of the truncated cone of the insulator 12, preferably, the opening angle of the inclined guide hole 701 provided on the support plate of the insulator 12 is between 10° and 25°. Figure 4 Angle α is shown.

[0055] Furthermore, in order to ensure that there is a high-voltage and low-voltage insulation distance between the hot air pipe 11 and the insulator 12 support plate, preferably, the straight-line distance between the hot air pipe 11 and the insulator 12 support plate needs to be greater than the polarity of the electric field structure of the electrostatic precipitator. Figure 4 The distance β is shown.

[0056] Furthermore, in order to avoid a gap between the upper port of the truncated cone insulator 12 and the supporting plate of the insulator 12, and a gap between the lower port of the truncated cone insulator 12 and the inner top cover, preferably, a sealing gasket is further included. On the one hand, a sealing gasket is provided between the upper port of the truncated cone insulator 12 and the lower end of the supporting plate of the insulator 12, and on the other hand, a sealing gasket is provided between the lower port of the truncated cone insulator 12 and the inner top cover. In the embodiment of the present invention, the material of the sealing gasket can be graphite packing or asbestos packing. It should be noted that if the material of the sealing gasket is graphite packing, the graphite packing cannot be immersed in oil.

[0057] For example, the material of the insulator 12 provided in the embodiment of the present invention can be selected according to the flue gas temperature. In one way, for flue gas above 250°C, the material of the insulator 12 must be 95% porcelain (95% alumina); in special cases, 99% porcelain (99% alumina) with better electrical resistance can be selected; in another way, in order to prevent thermal breakdown of the insulator 12, the material of the insulator 12 is 95% porcelain. e The value (temperature when the material resistivity drops to 1MΩ·cm) is 1000℃, 99 porcelain t e The value is 1170℃.

[0058] For example, a dust cover 14 is also provided between the insulator chamber 9 and the high-temperature electrostatic precipitator 1. Specifically, the dust cover 14 is provided between the high-temperature electrostatic precipitator 1 and the inner top cover, and is welded and fixed on the inner top cover. The dust cover 14 is concentrically provided with the suspension rod 15 penetrating the support plate of the insulator 12 and the support plate of the insulator 12. By providing the dust cover 14 on the high-temperature electrostatic precipitator 1, part of the charged dust can be effectively captured. In the embodiment of the present invention, the material of the dust cover 14 is ordinary carbon structural steel (Q235-B), and the ordinary carbon structural steel forms a cylindrical body, that is, the shape of the dust cover 14 is a cylindrical body, the diameter of the cylindrical body is 400-600mm, to ensure the insulation distance, the height is greater than 400mm, and the wall thickness of the cylindrical body is between 3mm and 5mm.

[0059] For example, the hot air duct 11 provided in the embodiment of the present invention is made of ordinary carbon structural steel with a specification of φ10×2, and an anti-corrosion layer is coated on the inner wall of the hot air duct 11. In the embodiment of the present invention, the heat exchange area of ​​the hot air duct 11 needs to be determined by heat balance, the insulator 12 is evenly heated, and the temperature of the insulator chamber 9 is 3°C to 5°C higher than the temperature of the flue gas treated by the dust collector, which completely solves the problem of the flue gas containing sediment rising into the insulator chamber 9 caused by the high-temperature electrostatic precipitator 1 treating the flue gas temperature much higher than the temperature of the insulator chamber 9, forming a high-temperature sealing effect of the insulator chamber 9. Furthermore, a thermal insulation layer 12 is provided on the shell 11 of the insulator chamber 9.

[0060] It should be noted that the specifications of the hot air pipe 11 above indicate that the outer diameter of the hot air pipe 11 is 10 mm and the pipe wall thickness is 2 mm.

[0061] In order to more clearly introduce a high-temperature sealed coupled hot air blowing system for a high-temperature electrostatic precipitator insulator provided in an embodiment of the present invention, the working method of the high-temperature sealed coupled hot air blowing system for a high-temperature electrostatic precipitator insulator is introduced as follows: the high-temperature electrostatic precipitator 1 performs efficient dust removal on the high-temperature clean flue gas, and the high-temperature electrostatic precipitator 1 includes a first flue gas outlet which 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 electrostatic precipitator is used to determine a first temperature of the high-temperature clean flue gas after dust removal, and sends the first temperature to a control system 5. At the same time, a second temperature sensor 6 arranged in the insulator chamber 9 is used to determine a second temperature of the insulator chamber 9, and sends the second temperature to the control system 5. The control system 5 adjusts the power of the electric heater 4 according to the second temperature and the first temperature to further heat and raise the temperature of the high-temperature clean flue gas after dust removal; the air inlet end of the hot air pipe 11 is connected to the electric heater 4 The hot air duct 11 is connected to the air outlet, and the hot air duct 11 is wound around the truncated cone-shaped insulator 12 with upper and lower openings. Under the thermal effect of the hot air duct 11, the insulator 12 can be evenly heated, and the temperature of the insulator chamber 9 is made higher than the temperature of the high-temperature clean flue gas after dust removal by the high-temperature electrostatic precipitator 1. Generally, the temperature of the insulator chamber 9 is 3°C to 5°C higher than the processing temperature of the electrostatic precipitator. The heated high-temperature clean flue gas entering the insulator chamber 9 forms clean flue gas after heat exchange through the hot air duct 11. The clean flue gas passes through the outlet of the hot air duct 11 and is returned to the second flue gas outlet of the high-temperature electrostatic precipitator 1. The pressure difference caused by the temperature difference makes the high-temperature clean flue gas after dust removal no longer rise and enter the insulator chamber 9, forming a high-temperature sealing effect of the insulator chamber 9. At the same time, the insulator support plate 7 is provided with vertical guide holes 702 and inclined guide holes 701. The high-temperature electrostatic precipitator 1 operates at negative pressure to form hot air to sweep the inner wall of the insulator 12 and the suspension rod 15. The high-temperature seal of the insulator 12 coupled with hot air blowing can effectively prevent dust-containing flue gas from entering the insulator chamber 9, ensuring the continuous and efficient operation of the high-temperature electrostatic precipitator 1, greatly reducing the replacement cost of the insulator 12, and at the same time utilizing the waste heat of the clean flue gas at the outlet of the precipitator to reduce investment and use costs, with significant energy-saving benefits.

[0062] To summarize, a high-temperature sealed coupled hot air blowing system for an insulator of a high-temperature electrostatic precipitator in an embodiment of the present invention comprises: an electric heater, whose air inlet end is connected to the first flue gas outlet of the high-temperature electrostatic precipitator, and is used to heat the high-temperature clean flue gas after dust removal by the high-temperature electrostatic precipitator, so that the temperature of the heated high-temperature clean flue gas is higher than the temperature of the high-temperature clean flue gas after dust removal; an insulator, whose upper and lower openings are arranged in a truncated cone shape on the inner top cover of the high-temperature electrostatic precipitator, whose lower port contacts the inner top cover, and whose upper port contacts the insulator support plate; a hot air duct, whose air inlet end is connected to the outlet of the electric heater, which is arranged in a winding manner on the outer surface of the insulator, and whose outlet is connected to the second flue gas outlet of the high-temperature electrostatic precipitator through a pipe. The system can reheat the high-temperature clean flue gas after dust removal through an electric heater, so that the temperature of the heated high-temperature clean flue gas entering the insulator chamber is higher than that of the high-temperature clean flue gas after dust removal, eliminating the problem of dust-containing flue gas rising into the insulator chamber due to the large temperature difference between the insulator chamber and the dust collector body of the high-temperature electrostatic precipitator technology. At the same time, the hot air purge formed by the negative pressure operation of the electrostatic precipitator is coupled to effectively prevent the dust-containing flue gas from rising into the insulator chamber, ensuring the continuous and efficient operation of the high-temperature electrostatic precipitator.

[0063] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0064] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these 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 these modifications and variations.

Claims

1. A high-temperature sealed coupled hot air blowing system for high-temperature electric precipitator insulators, characterized in that: include: An electric heater, whose air inlet end is connected to the first flue gas outlet of the high-temperature electrostatic precipitator, is used to heat the high-temperature clean flue gas after dust removal by the high-temperature electrostatic precipitator, so that the temperature of the heated high-temperature clean flue gas is higher than the temperature of the high-temperature clean flue gas after dust removal; An insulator, whose upper and lower openings are truncated cone-shaped and arranged on the inner top cover of the high-temperature electrostatic precipitator, whose lower port contacts the inner top cover, and whose upper port contacts the insulator support plate; a hot air duct, whose air inlet end is connected to the outlet of the electric heater, which is arranged on the outer surface of the insulator in a winding manner, and whose outlet is connected to the second flue gas outlet of the high-temperature electrostatic precipitator through a pipeline; Also includes a controller, a first temperature sensor, a second temperature sensor and an induced draft fan; One end of the induced draft fan is connected to the first flue gas outlet of the high-temperature electric precipitator, and the other end is connected to 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 is used to determine the first temperature of the high-temperature clean flue gas after dust removal by the high-temperature electrostatic precipitator; The second temperature sensor is disposed in the insulator chamber and is used to determine a second temperature in the insulator chamber; The first temperature sensor, the second temperature sensor and the electric heater are electrically connected to the controller respectively; The controller is used to determine 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; The second temperature is 3-5°C higher than the first temperature, wherein the first temperature is consistent with the temperature at which the flue gas is treated by the high-temperature electrostatic precipitator; The insulator support plate is provided with inclined guide holes, vertical guide holes and hanging holes; The vertical guide hole, the inclined guide hole and the hanging hole are all arranged concentrically with the insulator support plate, and the distance between the vertical guide hole and the point of the concentric circle is smaller than the distance between the inclined guide hole and the diameter of the point of the concentric circle; The hanging hole is used to set a hanging rod, one end of the hanging rod passes through the hanging hole and is fixed to the upper end of the insulator support plate, and the other end passes through the inner top cover and extends into the high-temperature electric precipitator.

2. The insulator high temperature sealed coupled hot air blowing system according to claim 1, characterized in that: A boss is arranged at the lower end of the insulator support plate, the diameter of the insulator support 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.

3. The insulator high temperature sealed coupled hot air blowing system according to claim 1, characterized in that: The thickness of the insulator support plate is between 25 mm and 30 mm; The vertical guide holes are arranged at 1 / 3 radius of the insulator support plate, and include 4 of them; The inclined guide holes are arranged at 2 / 3 of the radius of the insulator support plate, and include 8 of them; The apertures of the vertical guide holes and the inclined guide holes are between 8 mm and 12 mm.

4. The insulator high temperature sealed coupled hot air blowing system according to claim 3, characterized in that: The opening angle of the inclined guide hole is between 10° and 25°.

5. The insulator high temperature seal coupled hot air blowing system according to claim 1, characterized in that: It also includes a sealing gasket, which is arranged between the lower port of the insulator and the inner top cover, and between the upper port of the insulator and the insulator support plate; The sealing gasket is made of graphite packing.

6. The insulator high temperature seal coupled hot air blowing system according to claim 1, characterized in that: It also includes a dust cover, which is arranged at the lower part of the top cover of the high-temperature electric precipitator and welded, and is concentrically arranged with the suspension rod penetrating the insulator support plate; The material of the dust cover is common carbon structural steel, and the shape of the dust cover is a cylindrical body. The diameter of the cylindrical body is 440-600mm, the height is 450-550mm, and the thickness of the cylinder wall is between 3mm and 5mm.

7. The insulator high temperature seal coupled hot air blowing system according to claim 1, characterized in that: The specification of the hot air pipe is φ10×2, and its material is ordinary carbon structural steel.

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