A high voltage electrostatic power supply explosion-proof control cabinet

Abstract

The present invention provides a high-voltage electrostatic power supply explosion-proof control cabinet, which is suitable for hazardous areas in Zone 1 or Zone 2 in factories and enterprises where explosive gas or dust composed of T1-T6 in IIA, IIB, and IIC exists or may exist; a high-voltage electrostatic power supply with explosion-proof performance is used to purify organic matter such as tar and asphalt in the gas. The present invention combines a positive pressure explosion-proof method on the basis of not changing the existing high-voltage electrostatic power supply control method to achieve a high-voltage electrostatic power supply explosion-proof control cabinet that meets the explosion-proof performance requirements in the explosion-proof area.

Description

Technical Field

[0001] The invention belongs to the technical field of electric tar collectors and relates to a high-voltage electrostatic power supply explosion-proof control cabinet, which is widely used in various gas purification control equipment such as coal chemical industry, petrochemical industry, new materials, etc. Background Art

[0002] The electric tar collector is used in the field of environmental dust removal. Its working principle is to use the negative high voltage generated by the high-voltage DC power supply to connect the corona electrode (cathode), and an electric field is generated between the corona electrode (cathode) and the precipitation electrode (anode). When the electric field strength exceeds a certain limit, corona discharge is generated between the positive and negative electrodes. At this time, the gas flowing through the electric field area is ionized, generating a large number of ions and electrons. The tar, dust, water mist and other particles passing through the electric field are combined with ions or electrons to be charged, and move toward the two poles under the action of the electric field force. Because the electron mass is small, the movement speed is fast, and the spatial distribution is wide, it is mainly the negatively charged particles that move toward the precipitation electrode. After reaching the precipitation electrode plate for neutralization, it first adsorbs on the precipitation electrode by relying on the remaining electrostatic attraction and intermolecular cohesion, and then falls along the electrode plate by its own gravity and is discharged through the tar outlet.

[0003] At present, electrostatic precipitators are widely used in coal chemical industry, petrochemical industry, new materials and other industries. High-voltage power supply is an indispensable component of electrostatic precipitators. Electrostatic precipitators use high-voltage electrostatic adsorption to purify gases. In the workplace air of coal chemical industry, petrochemical industry, new materials and other industries, there are or may be explosive gases or dusts such as IIA, IIB, IIC T1-T6 that cause explosions. my country uses a method equivalent to IEC to divide explosive hazardous places. The national standard GB50058-92 stipulates that explosive gas hazardous places are divided into three levels according to their degree of danger: Zone 0, Zone 1, and Zone 2. Zone 1 is an environment where explosive gas mixtures may appear during normal operation; Zone 2 is an environment where explosive gas mixtures are unlikely to appear during normal operation, or even if they appear, they only exist for a short time. The workplaces of coal chemical industry, petrochemical industry, new materials and other industries belong to Zone 1 or Zone 2 hazardous areas. The high-voltage power supply of existing electrostatic precipitators and their power supply control devices do not have explosion-proof properties. When electrostatic precipitators are used in coal chemical industry, petrochemical industry, new materials and other industries, explosions or partial burning of power supply components and other faults often occur. Summary of the invention

[0004] Based on the problems existing in the prior art, the applicant proposes a high-voltage electrostatic power explosion-proof control cabinet, which is suitable for electric tar collectors in various coal chemical, petrochemical, new materials and other industries.

[0005] According to the technical solution of the present invention, a high-voltage electrostatic power supply explosion-proof control cabinet is provided, which is suitable for hazardous areas in Zone 1 or Zone 2 in factories and enterprises where explosive gas or dust composed of T1-T6 in IIA, IIB, and IIC exists or may exist.

[0006] Furthermore, the high-voltage electrostatic power supply explosion-proof control cabinet is used to purify organic matter such as tar and asphalt in gas and has an explosion-proof high-voltage electrostatic power supply.

[0007] Preferably, the high-voltage electrostatic power supply explosion-proof control cabinet of the present invention combines a positive pressure explosion-proof method without changing the existing high-voltage electrostatic power supply control method to achieve a high-voltage electrostatic power supply explosion-proof control cabinet that meets the explosion-proof performance requirements in the explosion-proof area.

[0008] Furthermore, the explosion-proof control cabinet for high-voltage electrostatic power supply of the present invention is combined into a positive-pressure gas circuit control system by matching the control system in the external explosion-proof control box with the gas circuit control system, and introduces dry and clean protective gas into the high-voltage electrostatic power supply cabinet to form a positive-pressure cabinet. After the protective gas completes the purge and removal of the flammable gas and dust inside the cabinet, it can maintain a certain pressure of the positive-pressure gas in the cabinet, so that a slight positive pressure is formed in the cabinet, preventing the entry of flammable and explosive gases and dust from the outside.

[0009] Preferably, the positive pressure cabinet of the high-voltage electrostatic power explosion-proof control cabinet is provided with an internal pressure releaser. After the positive pressure cabinet is purged with protective gas, a set flow rate of protective gas must still be introduced into the positive pressure cabinet to keep the concentration of combustible gas and dust in the positive pressure cabinet below its lower explosion limit.

[0010] More preferably, the protective gas is compressed air or an inert gas.

[0011] The high-voltage electrostatic power explosion-proof control cabinet of the present invention comprises a high-voltage electrostatic power positive pressure cabinet and a positive pressure gas circuit control system. The high-voltage electrostatic power positive pressure cabinet is used to ensure a slightly positive pressure state relative to the external environment and is filled with protective gas internally. The positive pressure gas circuit control system is used to provide protective gas filling and control the operation of the high-voltage electrostatic power positive pressure cabinet and monitor the gas pressure inside the cabinet of the high-voltage electrostatic power positive pressure cabinet.

[0012] Compared with the prior art, the high-voltage electrostatic power explosion-proof control cabinet of the present invention has the following beneficial effects:

[0013] 1. The explosion-proof control cabinet for high-voltage electrostatic power supply of the present invention is combined into a positive-pressure gas circuit control system by matching the control system in the external flameproof control box with the gas circuit control system, and introduces dry and clean protective gas into the high-voltage electrostatic power supply cabinet to form a positive-pressure cabinet. After the protective gas completes the purge and removal of the combustible gas and dust inside the cabinet, it can maintain a certain pressure of the positive-pressure gas in the cabinet, so that a slight positive pressure is formed in the cabinet to prevent the entry of combustible and explosive gases and dust from the outside.

[0014] 2. The high-voltage electrostatic power explosion-proof control cabinet of the present invention combines a positive pressure explosion-proof method without changing the existing high-voltage electrostatic power control method to achieve a high-voltage electrostatic power explosion-proof control cabinet that meets the explosion-proof performance requirements in the explosion-proof area. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a high-voltage electrostatic power supply explosion-proof control cabinet according to the present invention.

[0016] Figure 2 yes Figure 1 Schematic diagram of the gas circuit control principle of the high-voltage electrostatic power supply explosion-proof control cabinet. DETAILED DESCRIPTION

[0017] 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.

[0018] The present invention provides an explosion-proof control cabinet for a high-voltage electrostatic power supply, which is suitable for hazardous areas in Zone 1 or Zone 2 in factories and enterprises where explosive gas or dust composed of T1-T6 in IIA, IIB, and IIC exists or may exist, and is particularly suitable for a high-voltage electrostatic power supply with explosion-proof performance for purifying organic matter such as tar and asphalt in gas.

[0019] The present invention provides a high-voltage electrostatic power explosion-proof control cabinet, which combines a positive pressure explosion-proof method without changing the existing high-voltage electrostatic power control method to achieve a high-voltage electrostatic power explosion-proof control cabinet that meets the explosion-proof performance requirements in an explosion-proof area.

[0020] The high-voltage electrostatic power explosion-proof control cabinet of the present invention is a positive-pressure gas circuit control system formed by matching the control system in the external explosion-proof control box with the gas circuit control system. Dry and clean protective gas is introduced into the high-voltage electrostatic power cabinet to form a positive-pressure cabinet. After the protective gas completes the purge and removal of the combustible gas and dust inside the cabinet, it can maintain a certain pressure of the positive-pressure gas in the cabinet, so that a slight positive pressure is formed in the cabinet to prevent the external combustible and explosive gas and dust from entering. The positive-pressure cabinet of the high-voltage electrostatic power explosion-proof control cabinet is provided with an internal pressure releaser. After the protective gas is used to purge the positive-pressure cabinet, the protective gas of a set flow rate still needs to be introduced into the positive-pressure cabinet to keep the concentration of the combustible gas and dust in the positive-pressure cabinet below its lower explosion limit. The protective gas is compressed air or an inert gas.

[0021] like Figure 1 As shown, the high-voltage electrostatic power supply explosion-proof control cabinet includes a high-voltage electrostatic power supply positive pressure cabinet 1 and a positive pressure gas circuit control system 2. The high-voltage electrostatic power supply positive pressure cabinet 1 is used to ensure a slightly positive pressure state relative to the external environment and is filled with protective gas. The positive pressure gas circuit control system 2 is used to provide protective gas filling and control the operation of the high-voltage electrostatic power supply positive pressure cabinet 1 and monitor the gas pressure inside the cabinet of the high-voltage electrostatic power supply positive pressure cabinet 1.

[0022] A high-voltage electrostatic power supply is installed and arranged inside the high-voltage electrostatic power supply positive pressure cabinet 1. The electronic and electrical components constituting the high-voltage electrostatic power supply are arranged in the positive pressure cabinet in an optimized anti-electromagnetic interference manner. The positive pressure cabinet of the positive pressure cabinet is made of 2mm~3mm thick cold-rolled steel plate or stainless steel plate by bending and welding. The protective gas introduction pipeline adopts stainless steel pipe and galvanized pipe, etc., and the inlet and outlet cables adopt explosion-proof cable sealing joints. The front door of the high-voltage electrostatic power supply positive pressure cabinet 1 can be provided with a display window, display instrument and indicator light, etc., and its cabinet structure meets the corresponding explosion-proof standards and protection levels.

[0023] like Figure 1 As shown, the positive pressure air circuit control system 2 is arranged outside the positive pressure cabinet. Figure 2 As shown, the positive pressure gas circuit control system 2 includes a manual ball valve 11, a filter pressure reducing valve 12, an explosion-proof solenoid valve 13, a throttle valve 14 and a flow and pressure detection system 15. The manual ball valve 11 manually controls the main valve of the gas entering the high-voltage electrostatic power supply positive pressure cabinet 1. The filter pressure reducing valve 12 filters the moisture content of dust particles in the gas entering the high-voltage electrostatic power supply positive pressure cabinet 1 and reduces the intake pressure of the compressed gas. The explosion-proof solenoid valve 13 electrically controls the secondary valve of the gas entering the high-voltage electrostatic power supply positive pressure cabinet 1. The throttle valve 14 controls the flow of gas entering the high-voltage electrostatic power supply positive pressure cabinet to maintain the set pressure value of the gas in the cabinet. The flow and pressure detection system 15 monitors the gas flow and gas pressure entering the high-voltage electrostatic power supply positive pressure cabinet and provides a control signal for the system.

[0024] Furthermore, a safety valve 16 and a manual exhaust valve 17 are provided on the inner side of the high-voltage electrostatic power supply positive pressure cabinet 1 corresponding to the positive pressure gas circuit control system 2. The safety valve 16 is used for automatic pressure relief of the system when the gas pressure in the high-voltage electrostatic power supply positive pressure cabinet is too high or during maintenance. The manual exhaust valve 17 is used for manual pressure relief of the gas pressure in the high-voltage electrostatic power supply positive pressure cabinet when the safety valve fails or during maintenance.

[0025] The positive pressure gas circuit control system is connected to the gas circuit control part in the high-voltage electrostatic power supply positive pressure cabinet 1 through the pipeline accessories 18.

[0026] Furthermore, the present invention provides a specific working process of a high-voltage electrostatic power supply explosion-proof control cabinet, which includes the following steps:

[0027] Step S1, introducing protective gas into the high-voltage electrostatic power supply cabinet through a positive pressure gas circuit control system to form a positive pressure cabinet; the protective gas is preferably dry and clean compressed air or inert gas;

[0028] Step S2, the protective gas is purged to remove the combustible gas and dust inside the cabinet;

[0029] Step S3, introduce protective gas into the cabinet through the positive pressure gas circuit control system, and open the throttle valve 14 to increase and maintain the preset pressure in the cabinet, so that a slight positive pressure is formed in the cabinet to prevent external flammable and explosive gases and dust from entering; under normal working conditions, ventilation is performed according to the factory setting value of the preset time, preferably 1800 seconds (the specific ventilation time length can be set according to the cabinet volume or user needs), and the pressure is released through the safety valve 16; so that the positive pressure inside the cabinet is maintained below the lower limit of the explosion of flammable gas and dust, and the lower limit of the explosion of flammable gas and dust is the concentration limit that can cause or lead to the occurrence of flammable gas and dust explosion.

[0030] Step S5, use the flow and pressure detection system 15 set in the positive pressure air circuit control system 2 to monitor the protective gas pressure in the high-voltage electrostatic power supply positive pressure cabinet 1. When the internal pressure of the high-voltage electrostatic power supply positive pressure cabinet 1 is lower than the lower pressure limit (for example, 130Pa), an alarm message will be displayed and the alarm will turn on. At this time, the alarm sound can be canceled by pressing the mute button.

[0031] Furthermore, the solenoid valve opens to replenish air inside the cabinet. If the pressure inside the cabinet continues to drop below the lower limit, for example, 70Pa, the high-voltage electrostatic power explosion-proof control cabinet will automatically cut off the power supply and all other relays in the high-voltage electrostatic power positive pressure cabinet 1 and return to the standby state. To run again, it is necessary to re-ventilate and repeat step S2.

[0032] The high-voltage electrostatic power explosion-proof control cabinet is different from the prior art in that no flow and pressure detection devices are set in the high-voltage electrostatic power positive pressure cabinet 1, but a flow and pressure detection system 15 is set in the positive pressure gas circuit control system 2; the positive pressure gas circuit control system 2 is connected to the inside of the high-voltage electrostatic power positive pressure cabinet 1 through a pipeline to form a pressure interconnection, and the high-voltage electrostatic power explosion-proof control cabinet realizes explosion-proof monitoring through pressure interconnection. This structural arrangement directly solves or eliminates the problems of detection delay and execution lag of existing explosion-proof equipment.

[0033] During the operation stage of the high-voltage electrostatic power explosion-proof control cabinet, if the internal pressure of the high-voltage electrostatic power positive pressure cabinet 1 is higher than the upper pressure limit (500Pa), the safety valve 16 on the top of the cabinet will automatically open, thereby ensuring that the high-voltage electrostatic power positive pressure cabinet 1 maintains a slight positive pressure.

[0034] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the embodiments of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A high-voltage electrostatic power supply explosion-proof control cabinet, characterized in that: It is suitable for hazardous areas in Zone 1 or Zone 2 in factories and enterprises where explosive gas or dust composed of T1-T6 in IIA, IIB, IIC exists or may exist; the power supply used in the high-voltage electrostatic power supply explosion-proof control cabinet is a high-voltage electrostatic power supply with explosion-proof performance for purifying tar and asphalt organic matter in the gas; The high-voltage electrostatic power source explosion-proof control cabinet comprises a high-voltage electrostatic power source positive pressure cabinet (1), wherein a high-voltage electrostatic power source is installed and arranged inside the high-voltage electrostatic power source positive pressure cabinet (1), and electronic and electrical components constituting the high-voltage electrostatic power source are arranged inside the positive pressure cabinet in a manner that resists electromagnetic interference; The positive pressure gas circuit control system (2) is arranged outside the high-voltage electrostatic power supply positive pressure cabinet; the positive pressure gas circuit control system (2) comprises a manual ball valve (11), a filter pressure reducing valve (12), an explosion-proof solenoid valve (13), a throttle valve (14) and a flow and pressure detection system (15); the manual ball valve (11) manually controls the main valve of the gas entering the high-voltage electrostatic power supply positive pressure cabinet (1); the filter pressure reducing valve (12) filters the dust particles in the gas entering the high-voltage electrostatic power supply positive pressure cabinet (1) and reduces the intake pressure of the compressed gas; the explosion-proof solenoid valve (13) electrically controls the secondary valve of the gas entering the high-voltage electrostatic power supply positive pressure cabinet (1); the throttle valve (14) controls the flow of the gas entering the high-voltage electrostatic power supply positive pressure cabinet to maintain the set pressure value of the gas in the cabinet; the flow and pressure detection system (15) monitors the gas flow and gas pressure entering the high-voltage electrostatic power supply positive pressure cabinet and provides a control signal for the system; A safety valve (16) and a manual exhaust valve (17) are provided on the inner side of a high-voltage electrostatic power supply positive pressure cabinet (1) corresponding to the positive pressure gas circuit control system (2). The safety valve (16) is used for automatically exhausting the pressure of the system when the gas pressure in the high-voltage electrostatic power supply positive pressure cabinet is too high or during maintenance. The manual exhaust valve (17) is used for manually exhausting the pressure when the safety valve fails, the gas pressure in the high-voltage electrostatic power supply positive pressure cabinet is too high or during maintenance. The control system in the external explosion-proof control box is matched with the gas circuit control system to form a positive pressure gas circuit control system. Through the positive pressure gas circuit control system, dry and clean protective gas is introduced into the high-voltage electrostatic power cabinet to form a positive pressure cabinet. After the protective gas completes the purge and removes the combustible gas and dust inside the cabinet, it can maintain a certain pressure of the positive pressure gas in the cabinet, so that a slight positive pressure is formed in the cabinet to prevent the external combustible and explosive gas and dust from entering; The positive pressure cabinet of the high-voltage electrostatic power explosion-proof control cabinet is equipped with an internal pressure releaser. After the protective gas is purged inside the positive pressure cabinet, the protective gas with a set flow rate is introduced into the positive pressure cabinet to keep the concentration of combustible gas and dust in the positive pressure cabinet below its lower explosion limit at all times; the protective gas is compressed air or inert gas.

2. The high-voltage electrostatic power explosion-proof control cabinet according to claim 1 is characterized in that: The invention comprises a high-voltage electrostatic power supply positive pressure cabinet (1) and a positive pressure gas circuit control system (2); the high-voltage electrostatic power supply positive pressure cabinet (1) is used to ensure a slightly positive pressure state relative to the external environment and to be filled with protective gas; the positive pressure gas circuit control system (2) is used to provide the filling of protective gas and control the operation of the high-voltage electrostatic power supply positive pressure cabinet (1) and monitor the gas pressure inside the cabinet of the high-voltage electrostatic power supply positive pressure cabinet (1).

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