CN109889078B - High-voltage double-pulse superposition power supply for electrostatic dust collection - Google Patents
High-voltage double-pulse superposition power supply for electrostatic dust collection Download PDFInfo
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- CN109889078B CN109889078B CN201910112252.6A CN201910112252A CN109889078B CN 109889078 B CN109889078 B CN 109889078B CN 201910112252 A CN201910112252 A CN 201910112252A CN 109889078 B CN109889078 B CN 109889078B
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- 239000000428 dust Substances 0.000 title claims abstract description 40
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 5
- 239000002131 composite material Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000003723 Smelting Methods 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 238000004924 electrostatic deposition Methods 0.000 description 1
- 239000012717 electrostatic precipitator Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- -1 nonferrous smelting Substances 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a high-voltage double-pulse superposition power supply for electrostatic dust collection, wherein the high-voltage double-pulse superposition power supply for electrostatic dust collection adopts three-phase input, adopts a series resonance mode through a resonant circuit, realizes zero current turn-off, and the highest output pulse frequency is designed to be 40KHZ. The invention effectively solves the problem of insufficient power of the existing high-frequency pulse power supply, has the advantages of the high-frequency pulse power supply, and has the characteristics of three-phase balance, small ripple coefficient, high flashover voltage and constant current; meanwhile, the generation of back corona can be avoided aiming at high specific resistance dust; meanwhile, double pulse superposition improves the collection of superfine dust, the dust removal efficiency and the application range of a power supply.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and relates to a high-voltage double-pulse superposition power supply for electrostatic dust collection, which is widely applied to thermal power, steel, cement, nonferrous smelting, coal coking, chemical industry, electronics, 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 remarkable advantages of small three-phase balance input and output ripple, high average voltage and current, small volume of a transformer, 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 defect of 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 resonance interference through other components in a circuit, and if certain measures are not taken for inhibiting, eliminating and shielding the interference, the normal operation 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 the power frequency transformer, the interference can be shifted into a power frequency power grid, and other nearby electronic instruments, equipment and control equipment are severely interfered.
The improved high-frequency composite pulse power supply adopts a design scheme that pulse voltage is superposed on high-frequency direct-current base voltage, so that the back corona phenomenon of high-specific resistance dust can be effectively overcome, and the collection of superfine dust is improved. The implementation mode is to add a group of pulse transformers to the high-frequency transformer, so that the high-frequency pulse transformer has the advantages of a high-frequency power supply, and meanwhile, the advantages of a composite pulse power supply are integrated. Because a group of pulse transformers are additionally arranged, the problems of large volume of an oil tank, high-voltage rectification superposition and the like are caused, and the defects of complex production process, insufficient pulse power and the like are also caused.
Disclosure of Invention
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 superposition power supply for electrostatic dust collection, which is suitable for the requirements of industry on high-voltage power supply for electrostatic dust collection.
According to the technical scheme of the invention, a high-voltage double-pulse superposition power supply for electrostatic dust collection is provided, wherein three-phase input is adopted, a series resonance mode is adopted through a resonant circuit, zero current turn-off is realized, and the highest output pulse frequency is designed to be 40KHZ. The zero-current-turn-off-based operation mode is matched with the pulse frequency of 40KHZ, so that the problems in the prior art can be obviously overcome.
The inverter transformer part adopts a parallel operation mode of two groups of transformers with the same power, wherein each group of transformers is formed by connecting two high-voltage bags in series. And 4 silicon stacks of each high-voltage package are rectified, two high-voltage packages of each transformer are connected in series after being rectified, and the two transformers are independently rectified and then are connected in parallel to be output, so that 16 silicon stacks are formed. 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 100-500HZ. And the secondary output of basic high-frequency pulse is 0-40KHZ, and the composite pulse is 50-80 KHZ.
Compared with the prior art, the high-voltage double-pulse superposition power supply for electrostatic dust collection adopts double groups of identical transformers to respectively rectify and output in parallel, and effectively solves the problem of insufficient power of the existing high-frequency pulse power supply. The high-frequency pulse power supply has the advantages of high-frequency pulse power supply, three-phase balance, small ripple coefficient, high flashover voltage and constant current. Meanwhile, the back corona can be avoided aiming at high specific resistance dust. Meanwhile, double pulse superposition improves the collection of superfine dust, the dust removal efficiency and the application range of a power supply.
Drawings
Fig. 1 is a schematic diagram of a high-voltage double-pulse superposition power supply for electrostatic dust collection according to the present invention.
Fig. 2 is a schematic diagram of a high-voltage double-pulse superposition power rectification silicon stack for electrostatic dust collection.
Fig. 3 is a schematic diagram of a waveform of a secondary current of a high-voltage double-pulse superposition power supply for electrostatic dust collection.
Fig. 4 is a schematic diagram of a composite pulse secondary current waveform of a high-voltage double-pulse superposition power supply for electrostatic dust collection.
Fig. 5 is a schematic diagram of a waveform of a secondary voltage of a high-voltage double-pulse superposition power supply for electrostatic dust collection.
Fig. 6 is a schematic diagram of a system in which a high-voltage double-pulse superposition power supply for electrostatic dust collection is applied to an electrostatic dust collection apparatus.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a high-voltage double-pulse superposition power supply for electrostatic dust collection, wherein three-phase input is adopted, a series resonance mode is adopted through a resonant circuit, zero current turn-off is realized, and the highest output pulse frequency is designed to be 40KHZ. The zero-current-turn-off-based operation mode is matched with the pulse frequency of 40KHZ, so that the problems in the prior art can be obviously overcome.
Further, a resonance loop of the high-voltage double-pulse superposition power supply for electrostatic dust collection adopts a series resonance mode, an inversion transformer part adopts a parallel operation mode of double groups of transformers with the same power, and each group of transformers is formed by connecting two high-voltage bags in series; the two groups of transformers are independently 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 100-500us, and the pulse frequency is 100-500HZ; and the secondary output of basic high-frequency pulse is 0-40KHZ, and the composite pulse is 50-80 KHZ.
As shown in fig. 1, the high-voltage double-pulse superposition 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, DB2 are double bridge IGBT, wherein C1 resonance capacitor, L1 resonance inductance, and leakage inductance LS1 of inverter transformer T1, load capacitor CS form series resonance loop, realize zero current turn-off by setting resonance center point, and the highest output pulse frequency is designed to 40KHZ.
The inverter transformer part adopts a parallel operation mode of two groups of transformers T1 and T2 with the same power, wherein each group of transformers is respectively formed by connecting two high-voltage packages T1A, T B and T2A, T B in series. And 4 silicon stacks of each high-voltage package are rectified, two high-voltage packages of each transformer are connected in series after being rectified, and the two transformers are independently rectified and then are connected in parallel to be output, and the total number of the two high-voltage packages is 16, namely the silicon stacks D1-D16. As shown in fig. 2, the positive terminals of D1, D2, D9, and D10 are connected to the negative high voltage output terminal-HV, the negative terminal of D1 is connected to the first terminal of T1A and the positive terminal of D3, the negative terminal of D2 is connected to the second terminal of T1A and the positive terminal of D4, the negative terminals of D3 and D4 are connected to the positive terminals of D5 and D6, the negative terminal of D5 is connected to the first terminal of T1B and the positive terminal of D7, the negative terminal of D6 is connected to the second terminal of T1B and the positive terminal of D8, the negative terminal of D9 is connected to the first terminal of T2A and the positive terminal of D11, the negative terminal of D10 is connected to the second terminal of T2A and the positive terminal of D12, the negative terminals of D11 and D12 are connected to the positive terminals of D13 and D14, the negative terminal of D13 is connected to the first terminal of T2B and the positive terminal of D15, the negative terminal of D14 is connected to the second terminal of T2B and the positive terminal of D16, and the negative terminals of D7, D8, D15 and D16 are connected to the negative high voltage output terminal.
The high-voltage double-pulse superposition power supply for electrostatic dust collection uses two groups of independent driving square waves, wherein the basic pulse driving frequency can reach 20KHZ. The driving frequency of the composite pulse can reach 40KHZ, the amplitude is more than or equal to 100us, and the frequency of the composite pulse is 100-500HZ. And the secondary output of basic high-frequency pulse is 0-40KHZ, and the composite pulse is 50-80 KHZ. The secondary current waveform of the double pulse power supply is shown in fig. 3, which shows the secondary current waveform of the basic pulse 4KHZ, the composite pulse 72KHZ and the amplitude 1000us, and which describes the principle of superposition of the basic pulse and the composite pulse, namely, a group of 72KHZ, 1000us and 100-500HZ composite pulses are output on the basis of the basic high-frequency pulse 4 KHZ. The composite pulse secondary current waveform is shown in fig. 4, which shows a composite pulse single pulse current waveform with an amplitude of 300us. The double pulse secondary voltage waveform shown in figure 5 is that the load 100 pipe test tower has a basic voltage of 65KV, the peak value of the superimposed pulse voltage can reach 150KV, and the composite high voltage can reach 150KV after the composite pulse of 72KHZ and 100us is superimposed.
As shown in fig. 6, the electrostatic precipitator body comprises a grounding pile, a cathode wire, an anode honeycomb and the like, a double-pulse power supply negative high voltage-HV is connected with the cathode wire, a double-pulse power supply grounding end is connected with the anode honeycomb and the body grounding pile and reliably grounded, the cathode wire generates a high-voltage electric field to ionize smoke, and dust charge in the air flow is separated from the air flow under the action of the electric field. Therefore, the ultrahigh voltage generated by the high-voltage double-pulse superimposed power supply for electrostatic dust collection can increase the speed of driving dust into anode honeycomb, thereby effectively improving the dust collection efficiency of the electrostatic dust collector.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention disclosed in the embodiments of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (1)
1. The high-voltage double-pulse superposition power supply for electrostatic dust collection is characterized in that an inverter transformer part in the high-voltage double-pulse superposition power supply for electrostatic dust collection adopts a parallel operation mode of two groups of transformers with the same power, each group of transformers is formed by connecting two high-voltage bags in series, and the two groups of transformers are independently rectified and then output in parallel; the high-voltage double-pulse superposition 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 C1 resonance capacitor, L1 resonance inductance, leakage inductance LS1 of inverter transformer T1, load capacitance CS form series resonance loop, realize zero current turn-off by setting resonance center point, the highest output pulse frequency is designed as 40KHZ;
in a rectifying silicon stack part of an inverter transformer part in a high-voltage double-pulse superposition power supply for electrostatic dust collection, each high-voltage package is rectified by 4 silicon stacks, and 16 rectifying silicon stacks D1-D16 are total; the positive ends of D1, D2, D9 and D10 are connected with a negative high voltage output end-HV, the negative end of D1 is connected with the first end of T1A and the positive end of D3, the negative end of D2 is connected with the second end of T1A and the positive end of D4, the negative ends of D3 and D4 are connected with the positive ends of D5 and D6, the negative end of D5 is connected with the first end of T1B and the positive end of D7, the negative end of D6 is connected with the second end of T1B and the positive end of D8, the negative end of D9 is connected with the first end of T2A and the positive end of D11, the negative end of D10 is connected with the second end of T2A and the positive end of D12, the negative ends of D11 and D12 are connected with the positive ends of D13 and D14, the negative end of D13 is connected with the first end of T2B and the positive end of D15, the negative end of D14 is connected with the second end of T2B and the positive end of D16, and the negative ends of D7, D8 and D15 and D16 are connected with the negative high voltage output grounding end;
the high-voltage double-pulse superposition power supply for electrostatic dust collection uses two groups of independent driving square waves.
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| CN201910112252.6A CN109889078B (en) | 2019-02-13 | 2019-02-13 | High-voltage double-pulse superposition power supply for electrostatic dust collection |
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| CN110420758A (en) * | 2019-07-17 | 2019-11-08 | 武汉东城新能源有限公司 | A kind of high power DC superimposed pulse power supply |
| CN114146819B (en) * | 2021-12-02 | 2022-08-30 | 襄阳九鼎昊天环保设备有限公司 | Electric tar precipitator with corona electrode anti-swing structure |
| CN114157153A (en) * | 2021-12-02 | 2022-03-08 | 襄阳九鼎昊天环保设备有限公司 | 250KVA high-power high-frequency high-voltage electrostatic power supply |
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2019
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| US6240112B1 (en) * | 1997-12-15 | 2001-05-29 | Cymer, Inc. | High pulse rate pulse power system with liquid cooling |
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