CN215580938U - Energy-saving electric precipitation high-voltage power supply - Google Patents
Energy-saving electric precipitation high-voltage power supply Download PDFInfo
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- CN215580938U CN215580938U CN202120798919.5U CN202120798919U CN215580938U CN 215580938 U CN215580938 U CN 215580938U CN 202120798919 U CN202120798919 U CN 202120798919U CN 215580938 U CN215580938 U CN 215580938U
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Abstract
The utility model discloses an energy-saving electric dust removal high-voltage power supply. Belongs to the technical field of electric dust removal high-voltage power supplies. The problems that an existing electric precipitation composite pulse high-voltage power supply is complex in system, high in failure rate and poor in fault tolerance due to the fact that two sets of power supply systems are needed are solved. It is mainly characterized in that: the device comprises a current-limiting reactor, a rectifying unit, a high-frequency inversion unit, a high-frequency transformer, a direct-current voltage superposition unit and a pulse voltage superposition unit which are sequentially and electrically connected; the high-frequency transformer is a high-frequency single-phase transformer with a primary side single-winding structure and a secondary side multi-winding structure; the direct current voltage superposition unit comprises a plurality of direct current voltage circuits which are connected in sequence, and the pulse voltage superposition unit comprises a plurality of pulse voltage circuits which are connected in sequence. The utility model has the characteristics of small volume, adjustable pulse width and amplitude, various output characteristics and energy storage of the dust removal body, improves the dust removal efficiency of the electric dust removal system and reduces the electric energy consumption, and is mainly used for a high-voltage power supply in the electric dust removal system.
Description
Technical Field
The utility model belongs to the technical field of electric precipitation high-voltage power supplies, and particularly relates to an energy-saving electric precipitation high-voltage power supply.
Background
In an electric dust removal system, more high-energy electrons can be excited by increasing the output voltage of a high-voltage power supply, the dust collection efficiency can be improved, particularly, the dust collection system has a good filtering effect on PM2.5 fine particles, but the field intensity is increased, flashover discharge easily occurs, and the dust collection system cannot normally operate when flashover is frequently carried out. According to the theory of electric precipitation, the larger the advancing speed of dust is, the higher the dust removal efficiency of electric precipitation is, the advancing speed is in direct proportion to the field intensity of corona, and the contradiction between overhigh field intensity and gas breakdown can be solved through a pulse power supply mode. The electric dust removal composite pulse power supply is formed by coupling two power supply systems, a base part provides direct current voltage, a pulse part provides pulse voltage, and the two voltages are superposed through a coupling circuit and then provided for the dust removal body. Because flue gas operating mode difference is big and can change, especially the electric precipitation project of middle and small-size owner, put forward higher requirement to the operating mode adaptability of high voltage power supply characteristic, high voltage power supply should be able to export: smooth dc voltage, dc voltage superimposed pulse voltage, low voltage large current, high voltage small current, and the like.
The current electric precipitation composite pulse power supply scheme is shown in a schematic diagram of fig. 1 and comprises a switch unit, a filter inductor, a first three-phase rectifier bridge, an inverter unit, an isolation transformer, a second three-phase rectifier bridge, a pulse resonance circuit, a pulse transformer, a high-voltage coupling capacitor, an isolation inductor and a basic power supply system. Three-phase electric wire netting voltage sends to the filter reactor behind through the switch unit, convert direct current voltage into behind the first three-phase rectifier bridge, reverse the alternating current voltage that becomes amplitude adjustable through three-phase inverter circuit with direct current voltage, boost and realize keeping apart with the electric wire netting through isolation transformer, direct current voltage for amplitude adjustable through the rectification of second three-phase rectifier bridge, through pulse generating circuit output resonant current, through the resonant current of pulse high-voltage transformer coupling to the high-pressure side, form pulse voltage on fundamental voltage through high-voltage coupling electric capacity, for the power supply of dust removal body, improve electric dust removal system to the electric charge ability of dust particulate matter. The required basic voltage can be generated by a power frequency or high-frequency high-voltage direct-current power supply.
The main disadvantages are that: 1. the electrical cabinet has two systems of a basic power supply and a pulse power supply, and the systems are complex, high in failure rate and poor in fault tolerance; 2. a filter inductor, an inverter circuit, an isolation transformer and the like exist in the electric cabinet, so that the power consumption is large and the heat dissipation is difficult; 3. the IGBT in the pulse forming circuit works in a pulse current state, the instantaneous current is more than 3000A, electromagnetic interference is caused to surrounding electrical equipment, and normal operation of other equipment is influenced; 4. the frequency and amplitude of the resonant current generated by the pulse generating circuit have a large relationship with parasitic parameters of the pulse high-voltage transformer, and the requirements on the process consistency of the pulse transformer and the long-term stability of the integrated parameters are strict; 5. the current passing through the pulse high-voltage transformer is pulse heavy current, a large amount of magnetic materials are needed for ensuring that the magnetic core is not saturated, but the utilization rate is low, and meanwhile, the existence of the pulse transformer limits the output instantaneous power of the pulse power supply to be further improved; 6. the pulse voltage formed on the body by the current output by the pulse high-voltage transformer is greatly related to the load characteristic of the body, and the working condition adaptability is poor.
Disclosure of Invention
The utility model aims to provide an energy-saving electric dust removal high-voltage power supply which can realize the adjustment of pulse width and amplitude, multiple output characteristics and energy storage of a dust removal body by only adopting one power supply system.
The technical solution of the electric dust removal high-voltage power supply of the utility model is as follows: an energy-saving electric precipitation high-voltage power supply is characterized in that: the device comprises a current-limiting reactor, a rectifying unit, a high-frequency inversion unit, a high-frequency transformer, a direct-current voltage superposition unit and a pulse voltage superposition unit which are sequentially and electrically connected; the high-frequency transformer is of a primary side single-winding and secondary side multi-winding structure; the direct-current voltage superposition unit comprises a plurality of direct-current voltage circuits corresponding to part of the secondary multi-windings, the input ends of the plurality of direct-current voltage circuits are respectively connected with the output ends of the part of the secondary multi-windings, and the output ends are sequentially connected; the pulse voltage superposition unit comprises a plurality of pulse voltage circuits corresponding to the other part of secondary multi-winding, the input ends of the pulse voltage circuits are respectively connected with the output ends of the other part of secondary multi-winding, and the output ends are sequentially connected.
The positive output end of the direct-current voltage circuit in the technical scheme of the electric dust removal high-voltage power supply is connected with the negative output end of the adjacent direct-current voltage circuit; and the inversion output end of the pulse voltage circuit is connected with the anode of the adjacent pulse voltage circuit.
The high-frequency transformer in the technical scheme of the electric precipitation high-voltage power supply is a single-phase transformer, and the secondary side multi-winding of the high-frequency transformer is n1+ n2 groups; the number of the direct-current voltage circuits is n 1; the number of the pulse voltage circuits is n 2; wherein the number of n1 and n2 is configured according to the rated parameters of the high voltage power supply.
The direct-current voltage circuit in the technical scheme of the electric dust removal high-voltage power supply comprises a rectifying circuit and a filter circuit; the pulse voltage circuit consists of a rectifying circuit, a filter circuit and a half-bridge inverter circuit.
The rectifier circuit in the technical solution of the electric precipitation high-voltage power supply of the utility model is a rectifier bridge circuit composed of diodes; the filter circuit is composed of an energy storage capacitor; the half-bridge inverter circuit is composed of two IGBTs connected in series, and the two IGBTs respectively form an upper bridge arm and a lower bridge arm of the inverter half bridge. The superposition combination of outputting various voltage forms is realized by controlling the on-off of the upper bridge arm and the lower bridge arm of the half-bridge inverter circuit.
The current-limiting reactor in the technical scheme of the electric precipitation high-voltage power supply comprises a three-phase current-limiting reactor connected between a three-phase power grid and a rectification unit.
The technical scheme of the electric precipitation high-voltage power supply comprises that a rectifying unit comprises a rectifying bridge and a filter capacitor.
The high-frequency inversion unit in the technical scheme of the electric precipitation high-voltage power supply consists of a single-phase IGBT inversion bridge and a resonant capacitor.
The utility model adopts an energy-saving electric dust removal high-voltage power supply which is composed of a current-limiting reactor, a rectifying unit, a high-frequency inversion unit, a high-frequency transformer, a direct-current voltage superposition unit and a pulse voltage superposition unit which are electrically connected in sequence, wherein the high-frequency transformer is a high-frequency single-phase transformer with a primary side single-winding and secondary side multi-winding structure, the direct-current voltage superposition unit comprises a plurality of direct-current voltage circuits corresponding to part of secondary side multi-windings, the input ends of the plurality of direct-current voltage circuits are respectively connected with the output ends of the part of secondary side multi-windings, the output ends are sequentially connected, the pulse voltage superposition unit comprises a plurality of pulse voltage circuits corresponding to the other part of secondary side multi-windings, the input ends of the plurality of pulse voltage circuits are respectively connected with the output ends of the other part of secondary side multi-windings, and the output ends are sequentially connected, so that the energy-saving electric dust removal high-voltage power supply can be opened by selecting upper and lower bridge arms of the n2 half-bridge inversion circuits in the pulse voltage circuits, The switching-off combination is used for realizing equivalent high-transformation-ratio direct-current voltage output, equivalent low-transformation-ratio direct-current voltage output and direct-current voltage superposition pulse voltage output of the high-frequency transformer, so that one set of power supply system can realize the output capability of direct-current voltage superposition pulse voltage, and the equivalent transformation ratio of the high-frequency transformer is changed by controlling the switching-off of the upper bridge arm and the partial or all switching-on of the lower bridge arm of an inversion half bridge in n2 pulse voltage circuits and keeping the switching-on state, so that the high-voltage power supply outputs direct-current voltages of different voltage grades; providing basic voltage by n1 DC voltage circuits, controlling the upper bridge arm of the inverter half bridge in the n2 pulse voltage circuits to be switched off and the lower bridge arm to be partially or completely switched on, keeping for a period of time and then switching off, and providing DC voltage superposition pulse voltage for a load; and the lower bridge arm is kept off, and the charge on the load parasitic capacitor after the pulse voltage is formed is returned to the filter capacitors of the direct current voltage superposition unit and the pulse voltage superposition unit by controlling the switching-on of the upper bridge arm of the inversion half bridge, so that different output characteristics of the high-voltage power supply, such as high-basis direct current voltage, low-basis direct current voltage, direct current voltage superposition pulse voltage and the like, are realized.
The utility model has the characteristics of small volume, adjustable pulse width and amplitude, various output characteristics and energy storage of the dust removal body, improves the dust removal efficiency of the electric dust removal system and reduces the electric energy consumption at the same time. The utility model is mainly used for a high-voltage power supply in an electric dust removal system, and converts three-phase alternating voltage into high-voltage required by an electrostatic dust collector.
Drawings
FIG. 1 is a circuit diagram of a prior art electric precipitation composite pulse power supply.
FIG. 2 is a topological diagram of an electric precipitation high-voltage power supply circuit of the utility model.
FIG. 3 is a waveform diagram of the output of the basic power source of the present invention superimposed with a pulse power source.
In the figure: 1. a current limiting reactor; 2. a rectifying unit; 3. a high-frequency inversion unit; 4. a high-frequency transformer; 5. a base voltage superimposing unit; 6. and a pulse voltage superposition unit.
Detailed Description
The utility model will be further explained with reference to the drawings.
As shown in fig. 2, an embodiment of the energy-saving electric dust removal high-voltage power supply of the present invention includes a current-limiting reactor 1, a rectifying unit 2, a high-frequency inverting unit 3, a high-frequency transformer 4, a base voltage superimposing unit 5, and a pulse voltage superimposing unit 6, which are electrically connected in sequence, wherein the high-frequency transformer 4 is a high-frequency single-phase transformer having a primary-side single-winding structure and a secondary-side multi-winding structure.
The direct-current voltage superposition unit 5 comprises n1 direct-current voltage circuits corresponding to part of the secondary windings, each direct-current voltage circuit consists of a rectifying circuit and a filter circuit, input ends of the n1 direct-current voltage circuits are respectively connected with output ends of the part of the secondary windings, and positive output ends of the n1 direct-current voltage circuits are connected with negative output ends of adjacent direct-current voltage circuits to provide direct-current basic voltage for loads. The pulse voltage superposition unit 6 comprises n2 pulse voltage circuits corresponding to the other part of secondary windings, each pulse voltage circuit comprises a rectification circuit, a filter voltage and an inversion half-bridge circuit, the input ends of the n2 pulse voltage circuits are respectively connected with the output ends of the other part of secondary windings, and the inversion output ends are connected with the positive electrode output ends of the adjacent pulse voltage circuits to provide pulse voltage for the load. The rectification circuit is a rectifier bridge circuit formed by diodes, the filter circuit is formed by an energy storage capacitor, the half-bridge inverter circuit is formed by two IGBTs connected in series, the two IGBTs respectively form an upper inverter half-bridge arm and a lower inverter half-bridge arm, and superposition combination output of various voltage forms is realized by controlling the on-off of the upper and lower bridge arms of the pulse voltage superposition unit, so that direct energy exchange with the dust removal body is realized.
The current limiting reactor 1 includes 1 three-phase current limiting reactor, is connected between the three-phase power grid and the rectifying unit 2, and converts an alternating-current voltage into a direct-current voltage.
The rectifying unit 2 includes a rectifying bridge and a filter capacitor.
The high-frequency inversion unit 3 consists of a single-phase IGBT inversion bridge and a resonant capacitor. The high-frequency inversion unit 3 inverts the dc voltage into a high-frequency ac voltage, and sends the resonant capacitor and the resonant inductor to the high-frequency transformer 4.
The secondary side multi-winding of the high-frequency transformer 4 is n1+ n2 groups, wherein n1 groups correspond to n1 direct-current voltage circuits respectively, n2 groups correspond to n2 pulse voltage circuits respectively, and the number of n1 and n2 is configured according to the application and can be any value.
According to the control method, the on-off combination of the upper bridge arm and the lower bridge arm of a half-bridge inverter circuit in n2 pulse voltage circuits is selected, so that the equivalent high-transformation-ratio direct-current voltage output, the equivalent low-transformation-ratio direct-current power output and the direct-current voltage superposition pulse voltage output of the high-frequency transformer 4 are realized; by controlling the upper bridge arm of the inverter half bridge in the n2 pulse voltage circuits to be switched off, and the lower bridge arm to be partially or completely switched on and to be kept in a switched-on state, the equivalent transformation ratio of the high-frequency transformer 4 is changed, so that the high-voltage power supply outputs direct-current voltages with different voltage grades; providing basic voltage by n1 DC voltage circuits, controlling the upper bridge arm of the inverter half bridge in the n2 pulse voltage circuits to be switched off and the lower bridge arm to be partially or completely switched on, keeping for a period of time and then switching off, and providing DC voltage superposition pulse voltage for a load; and the lower bridge arm is kept off, and the charge on the load parasitic capacitor after the pulse voltage is formed is returned to the filter capacitors of the direct current voltage superposition unit and the pulse voltage superposition unit by controlling the switching-on of the upper bridge arm of the inverter half bridge for recovery, so that the pulse width is reduced and the electric energy is saved.
Example 1 of the utility model:
taking the equipment of 60kV/1000mA direct current voltage +60kV pulse power supply as an example, when the working condition of the dust removing body needs to output 80kV direct current voltage and does not need direct current voltage to superpose pulse voltage, the upper bridge arm and the lower bridge arm of a half-bridge inverter circuit of one third of pulse voltage superposition units can be kept off, the upper bridge arm and the lower bridge arm of a half-bridge inverter circuit of the other two thirds of pulse voltage superposition units can be kept off, at the moment, the equipment can be used as a high-voltage direct current power supply with the rated specification of 80kV/1000mA, and the output current of the equipment can be adjusted by adjusting the inversion frequency of an inverter bridge of a transformer primary side.
Example 2 of the utility model:
aiming at the flue gas working condition requiring the basic voltage to be superposed with the pulse voltage, for example, the power specification requiring the 60kV basic direct current voltage to be superposed with the 60kV pulse voltage, the n1 direct current voltage superposition units provide the basic voltage to firstly supply power to the dust removal body, and an internal space electric field of the body is established. The n2 pulse voltage superposition units are used as carriers for providing pulse voltage, an upper bridge arm of the half-bridge inverter circuit is turned off, a lower bridge arm of the half-bridge inverter circuit is turned on and is turned off after being kept for a period of time, and the pulse voltage units provide pulse energy to a load.
Due to the fact that the parasitic equivalent capacitance of the electric dust collector exists, trailing of pulse voltage is long, pulse width is too large, air breakdown is caused, the upper bridge arms of the pulse voltage superposition units can be switched on one by one, and charges of the parasitic equivalent capacitance of the electric dust collector are recycled into the filter capacitor in the pulse voltage superposition units, so that pulse width is reduced, and electric energy is saved. The output waveform diagram of the basic power source superposed with the pulse power source is shown in fig. 3.
Claims (8)
1. An energy-saving electric precipitation high-voltage power supply is characterized in that: the power supply comprises a current-limiting reactor (1), a rectifying unit (2), a high-frequency inverter unit (3), a high-frequency transformer (4), a direct-current voltage superposition unit (5) and a pulse voltage superposition unit (6) which are electrically connected in sequence; the high-frequency transformer (4) is a high-frequency transformer with a primary side single-winding and secondary side multi-winding structure; the direct-current voltage superposition unit (5) comprises a plurality of direct-current voltage circuits corresponding to part of the secondary windings, the input ends of the plurality of direct-current voltage circuits are respectively connected with the output ends of the part of the secondary windings, and the output ends are sequentially connected; the pulse voltage superposition unit (6) comprises a plurality of pulse voltage circuits corresponding to the other part of secondary multi-winding, the input ends of the pulse voltage circuits are respectively connected with the output ends of the other part of secondary multi-winding, and the output ends are sequentially connected.
2. The energy-saving electric dust removal high-voltage power supply of claim 1, characterized in that: the positive output end of the direct-current voltage circuit is connected with the negative output end of the adjacent direct-current voltage circuit; and the inversion output end of the pulse voltage circuit is connected with the anode of the adjacent pulse voltage circuit.
3. The energy-saving electric dust removal high-voltage power supply of claim 2, characterized in that: the high-frequency transformer (4) is a single-phase transformer, and the secondary multi-winding of the high-frequency transformer is n1+ n2 groups; the number of the direct-current voltage circuits is n 1; the number of the pulse voltage circuits is n 2.
4. The energy-saving electric dust removal high-voltage power supply of claim 3, characterized in that: the direct-current voltage circuit consists of a rectifying circuit and a filter circuit; the pulse voltage circuit consists of a rectifying circuit, a filter circuit and a half-bridge inverter circuit.
5. The energy-saving electric dust removal high-voltage power supply of claim 4, characterized in that: the rectifier circuit is a rectifier bridge circuit consisting of diodes; the filter circuit is composed of an energy storage capacitor; the half-bridge inverter circuit is composed of two IGBTs connected in series, and the two IGBTs respectively form an upper bridge arm and a lower bridge arm of the inverter half bridge.
6. The energy-saving electric dust removal high-voltage power supply of any one of claims 1 to 5, wherein: the rectifying unit (2) comprises a rectifying bridge and a filter capacitor.
7. The energy-saving electric dust removal high-voltage power supply of any one of claims 1 to 5, wherein: the high-frequency inversion unit (3) is composed of a single-phase IGBT inversion bridge and a resonant capacitor.
8. The energy-saving electric dust removal high-voltage power supply of claim 6, characterized in that: the high-frequency inversion unit (3) is composed of a single-phase IGBT inversion bridge and a resonant capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120798919.5U CN215580938U (en) | 2021-04-19 | 2021-04-19 | Energy-saving electric precipitation high-voltage power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120798919.5U CN215580938U (en) | 2021-04-19 | 2021-04-19 | Energy-saving electric precipitation high-voltage power supply |
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| CN215580938U true CN215580938U (en) | 2022-01-18 |
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| CN202120798919.5U Active CN215580938U (en) | 2021-04-19 | 2021-04-19 | Energy-saving electric precipitation high-voltage power supply |
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