Resonant capacitor device and high-frequency power supply of electric dust remover

Abstract

The utility model discloses a resonant capacitor device, which comprises a resonant capacitor cabin, a laminated busbar, a resonant capacitor, a mica partition plate and a temperature measurement module, the number of the mica partition plates is multiple, each mica partition plate is vertically arranged between every two adjacent resonant capacitors, and the temperature measuring module is arranged in the resonant capacitor cabin and used for collecting and transmitting temperature signals in the resonant capacitor cabin. The utility model also discloses a high-frequency power supply of the electric dust remover, which comprises a high-pressure cabin body and a low-pressure cabin body, and also comprises the resonant capacitor device, and the resonant capacitor device is arranged above the rectifier transformer outside the high-pressure cabin body. According to the utility model, the traditional configuration scheme, protection measures and installation positions of the resonant capacitors are optimized, so that the influence of individual capacitor faults on high-frequency power supply equipment is effectively reduced; meanwhile, an independent modular design is adopted, real-time monitoring of equipment temperature is completed, alarming and tripping functions are expanded, and the safety and reliability of capacitor operation are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of high-frequency power supply resonant capacitors for electric dust removal, in particular to a resonant capacitor device and a high-frequency power supply for electric dust removal. Background Art

[0002] At present, the high-frequency power supply of the electrostatic precipitator generally consists of a high-voltage cabin and a low-voltage cabin, in which the high-voltage cabin contains high-power components such as the main circuit power supply and distribution, full-bridge rectification, filtering, IGBT inverter, and resonant capacitor group. In the prior art, the resonant capacitor group is mostly composed of 8 resonant capacitors of model RNJ-PS, each with a capacitance of 1μF, arranged in sequence on a stacked busbar and connected in parallel. The internal electrodes and shell of the resonant capacitor are both organic materials, which will age over time. When the capacitor breaks down, it is often accompanied by deflagration. In addition, the capacitor is installed close to the rectifier bridge, IGBT, drive board, main contactor and other components. The capacitor fire can easily cause the entire power system to burn; at the same time, since the resonant capacitor circuit is located after the IGBT inverter, the impact caused by frequent spark flashovers in the electric field will also directly affect the service life of the capacitor. Utility Model Content

[0003] The utility model provides a resonant capacitor device capable of optimizing the resonant capacitor configuration scheme and an electrostatic precipitator high-frequency power supply, which can solve at least one of the above-mentioned technical problems.

[0004] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0005] A resonant capacitor device comprises a resonant capacitor cabin, a laminated busbar, a resonant capacitor, a mica separator and a temperature measurement module;

[0006] There are multiple stacked busbars, which are distributed in sequence and at intervals in the resonant capacitor cabin. There are multiple resonant capacitors, which are arranged in sequence and at intervals on each of the stacked busbars. There are multiple mica partitions, and a single mica partition is vertically arranged between two adjacent resonant capacitors. The temperature measurement module is arranged in the resonant capacitor cabin for collecting and transmitting the temperature signal in the resonant capacitor cabin.

[0007] Furthermore, the resonant capacitor is selected as a 0.27uF, 3000VDC model, and a plurality of the resonant capacitors are connected in parallel.

[0008] Furthermore, upper and lower ends of the mica partition are respectively attached to and abut against the stacked busbar or the wall of the resonant capacitor cabin.

[0009] Furthermore, the temperature measurement module is connected to a host computer via a high-frequency power supply controller, and the host computer is used to convert the collected temperature analog signal into a temperature digital signal, and compare it with a preset temperature threshold, and is also used to transmit a high temperature alarm signal and a high temperature trip signal.

[0010] A high-frequency power supply for an electrostatic precipitator comprises a high-voltage cabin and a low-voltage cabin, wherein the high-voltage cabin is provided with a main circuit power supply and distribution circuit, a full-bridge rectifier, a filter circuit and an IGBT inverter, and also comprises the resonant capacitor device, wherein the resonant capacitor device is arranged above the rectifier transformer outside the high-voltage cabin.

[0011] The beneficial effects of the utility model are embodied in:

[0012] 1. In the utility model, compared with the original resonant capacitor, multiple resonant capacitors with smaller capacitance, smaller capacitor volume and more capacitors are selected, and an independent resonant capacitor cabin is set to encapsulate all the resonant capacitors. At the same time, mica partitions are used to separate two adjacent resonant capacitors, and the traditional configuration scheme, protective measures and installation position of the resonant capacitor are optimized, which effectively reduces the impact of individual capacitor failures on high-frequency power supply equipment, and can reduce the probability of fire in electrostatic precipitator electrical equipment.

[0013] 2. In the utility model, a temperature measurement module is arranged in the capacitor resonance cabin to collect and monitor the temperature data in the cabin in real time. An independent modular design is adopted to improve the real-time monitoring of the equipment temperature, expand the alarm and tripping functions, and connect the temperature signal, high temperature alarm signal and high temperature tripping signal in the cabin to the operation station, so that the operator can control the operation status of each resonant capacitor in real time and take active and effective countermeasures to improve the safety and reliability of the capacitor operation.

[0014] 3. In the utility model, the independently packaged resonant capacitor cabin is moved from the inside of the original high-voltage cabin to above the rectifier transformer outside the cabin, which effectively enhances the ventilation and heat dissipation effect of the resonant capacitor, reduces the impact of the resonant capacitor failure on the entire equipment, and effectively ensures the safe and reliable operation of the electrostatic precipitator high-frequency power supply equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a resonant capacitor device according to an embodiment of the utility model.

[0016] Figure 2 It is a configuration diagram of multiple resonant capacitors in an embodiment of the utility model.

[0017] Figure 3 It is a connection block diagram of the temperature measurement module of the embodiment of the utility model.

[0018] Figure 4 This is a primary system diagram of the high-frequency power supply for electrostatic precipitators.

[0019] The components in the attached figure are marked as follows: 1. resonant capacitor cabin; 2. laminated busbar; 3. resonant capacitor; 4. mica partition; 5. temperature measurement module; 6. high-frequency power supply controller; 7. host computer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model. It should be noted that the meaning of "and / or" appearing in the full text includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, "multiple" refers to more than two.

[0021] See also Figure 1 , the embodiment of the utility model provides a resonant capacitor device, including a resonant capacitor cabin 1, a laminated busbar 2, a resonant capacitor 3, a mica partition 4 and a temperature measurement module 5;

[0022] There are multiple stacked busbars 2, which are distributed in sequence and at intervals in the resonant capacitor cabin 1. There are multiple resonant capacitors 3, which are arranged in sequence and at intervals on each of the stacked busbars 2. There are multiple mica partitions 4, and a single mica partition 4 is vertically arranged between two adjacent resonant capacitors 3. The temperature measurement module 5 is arranged in the resonant capacitor cabin 1, and is used to collect and transmit the temperature signal in the resonant capacitor cabin 1.

[0023] In the utility model, compared with the original resonant capacitor, multiple resonant capacitors with smaller capacitance, smaller capacitor volume and more capacitors are selected to reduce the impact of a single resonant capacitor failure on the entire equipment, and an independent resonant capacitor cabin is set to encapsulate all the resonant capacitors, further reducing the impact of a single or multiple resonant capacitor failures on surrounding equipment. At the same time, mica partitions are used to separate two adjacent resonant capacitors, which effectively plays a role in heat insulation and flame retardancy, reducing the risk of explosion and combustion in the cabin, and a temperature measurement module is used to collect and monitor the temperature in the cabin in real time, so as to realize remote control and protection of the resonant capacitor.

[0024] See also Figure 2In this embodiment, the resonant capacitor 3 is a 0.27uF, 3000VDC model, and multiple resonant capacitors 3 are connected in parallel. With this design, the traditional resonant capacitor group is generally composed of 8 film capacitors of model RNJ-PS and a single capacitance of 1μF arranged in parallel. When a film capacitor breaks down or explodes, multiple film capacitors will be burned together, and even the entire circuit will be burned. To this end, the present application reduces the single capacitance and capacitor volume, increases the number of capacitors, and thus reduces the impact of individual capacitor failures on the entire high-frequency power supply equipment.

[0025] See also Figure 1 In this embodiment, the upper and lower ends of the mica partition 4 are respectively fitted and abutted against the wall of the laminated busbar 2 or the resonant capacitor cabin 1. With this design, when the insulation of the series resonant circuit line to the ground is problematic and discharge to the ground occurs, the energy stored in the front-end rectifier filter capacitor itself is accumulated, and the induced voltage at the ground end increases. The secondary sampling of the power supply is just the secondary voltage sampling relative to the ground potential. When the ground potential increases, the secondary sampling phase voltage also increases accordingly. In addition, the secondary voltage sampling signal itself is very small (2mA at 100kV). Once the sampling signal ground potential drifts, a large deviation will occur in the secondary voltage. Therefore, when the resonant circuit is discharged to the ground, the power supply will have a secondary voltage high trip phenomenon. An effective way to prevent such problems is to strengthen the protection and isolation measures of the circuit line to avoid the resonant circuit from discharging to the ground. Therefore, the present application installs the mica partition 4 between two adjacent resonant capacitors 3, and the top and bottom ends of the mica partition 4 are respectively in close contact with the stacked busbar 2 or the wall of the resonant capacitor cabin 1, so as to completely isolate the two adjacent resonant capacitors 3 and play a role of heat insulation and flame retardancy. In this way, even if one of the resonant capacitors 3 fails and burns out, it will not affect the surrounding capacitors.

[0026] See also Figure 3 In this embodiment, the temperature measurement module 5 is connected to the host computer 7 via the high-frequency power supply controller 6. The host computer 7 is used to convert the collected temperature analog signal into a temperature digital signal, and compare it with the preset temperature threshold, and is also used to transmit a high temperature alarm signal and a high temperature trip signal. With this design, the temperature measurement module 5 collects the temperature in the resonant capacitor cabin 1 in real time, and maintains remote communication with the host computer 7 through the high-frequency power supply controller 6. The operator sets in the host computer 7: when the temperature reaches 60°C, the high temperature alarm signal of the resonant capacitor 3 is triggered; when the temperature reaches 70°C, the high temperature shutdown signal of the resonant capacitor 3 is triggered, which effectively avoids high temperature damage to any of the resonant capacitors 3 and further protects the resonant capacitor cabin 1 from burning.

[0027] See also Figure 4An embodiment of the present invention further provides a high-frequency power supply for an electrostatic precipitator, comprising a high-voltage cabin and a low-voltage cabin, wherein the high-voltage cabin is provided with a main circuit power supply and distribution circuit, a full-bridge rectifier, a filter circuit and an IGBT inverter, and also comprises the resonant capacitor device, wherein the resonant capacitor device is arranged above the rectifier transformer outside the high-voltage cabin.

[0028] In the utility model, all the resonant capacitors are encapsulated by setting up an independent resonant capacitor cabin, and the resonant capacitor cabin is moved from inside the original high-voltage cabin to above the rectifier transformer outside the cabin, which is beneficial to enhance the ventilation and heat dissipation effect of the resonant capacitor and further reduce the impact of any resonant capacitor failure on surrounding equipment.

[0029] In summary, in the utility model, compared with the original resonant capacitor, multiple resonant capacitors with smaller capacitance, smaller capacitor volume and more capacitors are selected, and an independent resonant capacitor cabin is set to encapsulate all the resonant capacitors. At the same time, mica partitions are used to separate two adjacent resonant capacitors, and the traditional configuration scheme, protective measures, and installation position of the resonant capacitor are optimized, which effectively reduces the impact of individual capacitor failures on high-frequency power supply equipment, and can reduce the probability of fire in electrostatic precipitator electrical equipment; at the same time, a temperature measurement module is set in the capacitor resonant cabin to collect and monitor the temperature data in the cabin in real time, adopt an independent modular design, improve the real-time monitoring of equipment temperature, expand the alarm and tripping functions, and connect the temperature signal, high temperature alarm signal and high temperature tripping signal in the cabin to the operation station, so that the operator can control the operation of each resonant capacitor in real time, and take active and effective countermeasures to improve the safety and reliability of capacitor operation.

[0030] In addition, in the utility model, the independently packaged resonant capacitor cabin is moved from inside the original high-voltage cabin to above the rectifier transformer outside the cabin, which effectively enhances the ventilation and heat dissipation effect of the resonant capacitor, reduces the impact of the resonant capacitor failure on the entire equipment, and effectively ensures the safe and reliable operation of the electrostatic precipitator high-frequency power supply equipment.

[0031] It should be understood that the examples and implementation modes described herein are for illustrative purposes only and are not intended to limit the present invention. Those skilled in the art may make various modifications or changes based on the examples and implementation modes. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A resonant capacitor device, characterized in that: It comprises a resonant capacitor cabin (1), a laminated busbar (2), a resonant capacitor (3), a mica partition (4) and a temperature measurement module (5); There are a plurality of stacked busbars (2) which are distributed in sequence and at intervals in the resonant capacitor compartment (1); there are a plurality of resonant capacitors (3) which are arranged in sequence and at intervals on each of the stacked busbars (2); there are a plurality of mica partitions (4), and a single mica partition (4) is vertically arranged between two adjacent resonant capacitors (3); and the temperature measurement module (5) is arranged in the resonant capacitor compartment (1) and is used to collect and transmit temperature signals in the resonant capacitor compartment (1).

2. The resonant capacitor device according to claim 1, wherein: The resonant capacitor (3) is a 0.27uF, 3000VDC model, and a plurality of the resonant capacitors (3) are connected in parallel.

3. The resonant capacitor device according to claim 1, wherein: The upper and lower ends of the mica partition (4) are respectively fitted and abutted against the laminated busbar (2) or the wall of the resonant capacitor cabin (1).

4. The resonant capacitor device according to claim 1, wherein: The temperature measurement module (5) is connected to a host computer (7) via a high-frequency power supply controller (6); the host computer (7) is used to convert the collected temperature analog signal into a temperature digital signal, and compare it with a preset temperature threshold, and is also used to transmit a high temperature alarm signal and a high temperature trip signal.

5. A high-frequency power supply for an electrostatic precipitator, characterized in that: It comprises a high-voltage cabin and a low-voltage cabin, wherein the high-voltage cabin is provided with a main circuit power supply and distribution circuit, a full-bridge rectifier, a filter circuit and an IGBT inverter, and also comprises a resonant capacitor device as described in any one of claims 1 to 4, wherein the resonant capacitor device is arranged above the rectifier transformer outside the high-voltage cabin.

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