CN210444194U

CN210444194U - High-voltage double-pulse superposed power supply for electrostatic dust collection

Info

Publication number: CN210444194U
Application number: CN201920198237.3U
Authority: CN
Inventors: 杨阳; 张缝松; 刘建玲
Original assignee: XIANGYANG JIUDING HAOTIAN ENVIRONMENTAL PROTECTION EQUIPMENT CO Ltd
Current assignee: XIANGYANG JIUDING HAOTIAN ENVIRONMENTAL PROTECTION EQUIPMENT CO Ltd
Priority date: 2019-02-13
Filing date: 2019-02-13
Publication date: 2020-05-01
Anticipated expiration: 2029-02-13

Abstract

The utility model provides an electrostatic precipitator is with high-pressure dipulse superimposed power supply, wherein electrostatic precipitator adopts the three-phase input with high-pressure dipulse superimposed power supply, adopts the series resonance mode through resonant circuit, realizes that zero current cuts off, and the design of highest output pulse frequency is 40 KHZ. The utility model effectively solves the problem of insufficient power of the existing high-frequency pulse power supply, and has the advantages of high-frequency pulse power supply, three-phase balance, small ripple coefficient, high flashover voltage and constant current characteristic; meanwhile, the generation of back corona can be avoided aiming at high specific resistance dust; meanwhile, the double pulses are superposed, so that the collection of ultrafine dust is improved, the dust removal efficiency is improved, and the application range of a power supply is widened.

Description

High-voltage double-pulse superposed power supply for electrostatic dust collection

Technical Field

The utility model belongs to the technical field of the environmental protection, a high-pressure dipulse superposes power for electrostatic precipitator is related to, the wide application is in thermoelectricity, steel, cement, non-ferrous smelting, coal coking, chemical industry, electron, flocking and other electrostatic deposition places.

Background

The electrostatic dust collection often uses a high-frequency power supply, and compared with a conventional silicon controlled rectifier power supply, the high-frequency power supply has the obvious advantages of three-phase balanced input, small output ripple, high average voltage and current, small transformer volume, high conversion efficiency and power factor and the like due to the difference in principle, and particularly can greatly improve the dust collection efficiency. However, the existing high-frequency switching power supply has the disadvantage of relatively serious switching interference, in the high-frequency switching power supply, a power adjusting switching tube works in a switching state, alternating voltage and current generated in the switching process of the high-frequency switching power supply can generate peak interference and resonant interference through other components in a circuit, and if certain measures are not taken to suppress, eliminate and shield the interference, the normal work of the whole machine can be seriously influenced. In addition, because the oscillating circuit of the high-frequency switching power supply is not isolated by a power frequency transformer, the interference can be fleed into a power frequency power grid, and other nearby electronic instruments, equipment and control equipment are seriously interfered.

The improved high-frequency composite pulse power supply adopts a design scheme of superposing pulse voltage on high-frequency direct-current basic voltage, can effectively overcome the back corona phenomenon of high-specific resistance dust, and improves the collection of ultrafine dust. The implementation mode is that a group of pulse transformers are additionally arranged outside the high-frequency transformer, so that the high-frequency power supply has the advantages of a high-frequency power supply and integrates the advantages of a composite pulse power supply. The problems of the volume of an oil tank, the superposition of high-voltage rectification and the like are caused because a group of pulse transformers are required to be added, and the defects of complex production process, insufficient pulse power and the like exist.

SUMMERY OF THE UTILITY MODEL

Based on the needs of reality and production practice, the applicant invests a large amount of funds and long-term research, and provides a high-voltage double-pulse superposed power supply for electrostatic dust collection, which meets the requirements of the industry on the high-voltage power supply for electrostatic dust collection.

According to the technical scheme of the utility model, a high-pressure dipulse superposes power for electrostatic precipitator wherein adopts the three-phase input, adopts the series resonance mode through resonant circuit, realizes that zero current shuts off, and the design of highest output pulse frequency is 40 KHZ. The operating mode based on zero current turn-off is matched with the pulse frequency design of 40KHZ, so that the problems in the prior art can be obviously overcome.

The inverter transformer part adopts a working mode that two groups of same power transformers are connected in parallel, wherein each group of transformers is formed by connecting two high-voltage packages in series. And in the silicon rectifier stack part, 4 silicon rectifiers are arranged in each high-voltage pack for rectification, two high-voltage packs of each group of transformers are connected in series after rectification, two groups of transformers are separately rectified and then output in parallel, and 16 silicon rectifier stacks are calculated in total. Two groups of independent driving square waves, wherein the basic pulse driving frequency can reach 20KHZ, the pulse driving frequency can reach 40KHZ, the amplitude is more than or equal to 100us, and the pulse frequency is 100-500 HZ. The secondary output basic high-frequency pulse is 0-40KHZ, and the composite pulse is 50-80 KHZ.

Compared with the prior art, the utility model discloses electrostatic precipitator adopts the parallelly connected output after the same transformer of two groups rectifies respectively with high-pressure double pulse stack power, effectively solves the not enough problem of current high frequency pulse power. The high-frequency pulse power supply has the advantages of three-phase balance, small ripple factor, high flashover voltage and constant current. Meanwhile, the generation of back corona can be avoided aiming at high specific resistance dust. Meanwhile, the double pulses are superposed, so that the collection of ultrafine dust is improved, the dust removal efficiency is improved, and the application range of a power supply is widened.

Drawings

Fig. 1 is a schematic diagram of the principle of the high-voltage double-pulse superimposed power supply for electrostatic dust collection according to the present invention.

FIG. 2 is a schematic diagram of a high-voltage double-pulse superimposed power supply silicon rectifier stack for electrostatic dust removal.

Fig. 3 is a schematic diagram of secondary current waveforms of a high-voltage double-pulse superimposed power supply for electrostatic dust removal.

Fig. 4 is a schematic diagram of a composite pulse secondary current waveform of a high-voltage double-pulse superimposed power supply for electrostatic dust removal.

FIG. 5 is a schematic diagram of secondary voltage waveform of high-voltage double-pulse superimposed power supply for electrostatic dust collection.

FIG. 6 is a schematic diagram of a system for applying a high-voltage double-pulse superimposed power supply for electrostatic dust removal to an electrostatic dust removal device.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The utility model provides a pair of high-pressure dipulse superposes power for electrostatic precipitator wherein adopts the three-phase input, adopts the series resonance mode through resonant circuit, realizes that the zero current shuts off, and the design of highest output pulse frequency is 40 KHZ. The operating mode based on zero current turn-off is matched with the pulse frequency design of 40KHZ, so that the problems in the prior art can be obviously overcome.

Furthermore, a resonance circuit of the high-voltage double-pulse superposed power supply for electrostatic dust removal adopts a series resonance mode, and an inverter transformer part adopts a working mode of connecting two groups of same-power transformers in parallel, wherein each group of transformers is formed by connecting two high-voltage packages in series; the two groups of transformers are separately rectified and then output in parallel; two groups of independent driving square waves, wherein the basic pulse driving frequency can reach 20KHZ, the pulse driving frequency can reach 40KHZ, the time is 100-; the secondary output basic high-frequency pulse is 0-40KHZ, and the composite pulse is 50-80 KHZ.

Specifically, as shown in fig. 1, the high-voltage double-pulse superimposed power supply for electrostatic dust collection adopts three-phase balanced input, and is rectified into DC537V through a three-phase rectifier bridge DZ and a capacitor C; DB1 and DB2 are double-bridge IGBT, wherein a C1 resonant capacitor, an L1 resonant inductor, a leakage inductor LS1 of an inverter transformer T1 and a load capacitor CS form a series resonant loop, zero current turn-off is realized by setting a resonant central point, and the highest output pulse frequency is designed to be 40 KHZ.

The inverter transformer part adopts a working mode that double groups of identical power transformers T1 and T2 are connected in parallel, wherein each group of transformers respectively consists of two high-voltage packs T1A, T1B, T2A and T2B which are connected in series. And 4 silicon stacks of each high-voltage pack are rectified, two high-voltage packs of each group of transformers are rectified and then connected in series, two groups of transformers are separately rectified and then output in parallel, and 16 rectifying silicon stacks D1-D16 are calculated. As shown in fig. 2, the positive terminal of D, D is connected to the negative high voltage output terminal-HV, the negative terminal of D is connected to the first terminal of T1 and the positive terminal of D, the negative terminal of D is connected to the second terminal of T1 and the positive terminal of D, the negative terminal of D is connected to D, the positive terminal of D, the negative terminal of D is connected to the first terminal of T1 and the positive terminal of D, the negative terminal of D is connected to the second terminal of T1 and the positive terminal of D, the negative terminal of D is connected to the first terminal of T2 and the positive terminal of D, the negative terminal of D is connected to the second terminal of T2 and the positive terminal of D, D negative terminal of D is connected to the negative high voltage output grounding terminal.

The high-voltage double-pulse superposed power supply for electrostatic dust removal uses two groups of independent driving square waves, wherein the driving frequency of basic pulses can reach 20 KHZ. The composite pulse driving frequency can reach 40KHZ, the amplitude is more than or equal to 100us, and the composite pulse frequency is 100-500 HZ. The secondary output basic high-frequency pulse is 0-40KHZ, and the composite pulse is 50-80 KHZ. The waveform of the secondary current of the double-pulse power supply shown in FIG. 3 shows the secondary current waveform at the amplitude of 1000us for the basic pulse of 4KHZ and the composite pulse of 72KHZ, and the diagram describes the superposition principle of the basic pulse and the composite pulse, i.e., a group of composite pulses of 72KHZ, 1000us and 100-inch 500HZ is output based on the basic high-frequency pulse of 4 KHZ. The composite pulse secondary current waveform is shown in fig. 4, which shows a composite pulse monopulse current waveform, with an amplitude of 300 us. As shown in the diagram of fig. 5, the load of the 100-tube test tower has a base voltage of 65KV, and the peak value of the pulse voltage after superposition can reach 150KV, which shows that the output composite high voltage can reach 150KV after superposition of 72KHZ and 100us composite pulses.

As shown in fig. 6, the electrostatic precipitator body includes a grounding pile, a cathode filament, an anode honeycomb, etc., a double-pulse power supply negative high voltage-HV is connected with the cathode filament, a double-pulse power supply grounding end is connected with the anode honeycomb and the body grounding pile and is reliably grounded, the cathode filament generates a high voltage electric field to ionize the flue gas, and the dust charges in the air flow are separated from the air flow under the action of the electric field. Therefore, the utility model discloses a produced superhigh pressure of high-pressure dipulse superimposed power supply for electrostatic precipitator will increase the speed that the positive pole honeycomb was driven into to the dust collection efficiency of electrostatic precipitator is effectively promoted.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the embodiments of the present invention are all covered by the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A high-voltage double-pulse superposed power supply for electrostatic dust collection is characterized in that the high-voltage double-pulse superposed power supply for electrostatic dust collection adopts three-phase input, and is rectified into DC537V through a three-phase rectifier bridge DZ and a capacitor C; the double-bridge IGBT is formed by DB1 and DB2, wherein a series resonance loop is formed by a resonance capacitor C1, a resonance inductor L1, a leakage inductor LS1 of an inverter transformer T1 and a load capacitor CS, and zero current turn-off is realized by setting a resonance central point;

the high-voltage double-pulse superposed power supply for electrostatic dust collection adopts a working mode that two groups of inverter transformers T1 and inverter transformers T2 with the same power are connected in parallel, wherein each group of inverter transformers respectively consists of two high-voltage packs T1A, T1B, T2A and T2B which are connected in series; each high-voltage pack is rectified by 4 silicon packs, two high-voltage packs of each group of inverter transformers are connected in series after being rectified, two groups of inverter transformers are separately rectified and then output in parallel, and 16 rectifying silicon packs D1-D16 are calculated in total;

positive terminals of D1, D2, D9 and D10 are connected to the negative high voltage output terminal-HV, a negative terminal of D1 is connected to the first terminal of T1A and the positive terminal of D3, a negative terminal of D2 is connected to the second terminal of T1A and the positive terminal of D4, negative terminals of D3 and D4 are connected to positive terminals of D5 and D6, a negative terminal of D5 is connected to the first terminal of T1B and the positive terminal of D7, a negative terminal of D6 is connected to the second terminal of T1B and the positive terminal of D8, a negative terminal of D8 is connected to the first terminal of T2 8 and the positive terminal of D8, a negative terminal of D8 is connected to the second terminal of T2 8 and the positive terminal of D8, negative terminals of D8 and D8 are connected to the positive terminals of T2 8 and the negative terminals of D8, and the negative terminals of D8 are connected to the negative terminals of D8 and the negative terminals of D8 and the D8.