CN1381314A - Asymmetrical high-voltage AC pulse duster - Google Patents

Abstract

A high-voltage static duster using asymmetric AC pulses is composed of rectifier circuit, current limiter for charging, filtering circuit, bridge-type inverse converter circuit, high-frequency step-up transformer, dust-gathering grounding electrode, high-votlage dedusting electrode, current detector circuit and asymmetric waveform generator, all of which are logically connected.

Description

A kind of high pressure asymmetrical alternating current pulse dust removal device

The present invention relates to a kind of high pressure electrostatic precipitation technology that utilizes and collect the device of removing dust in air.

In industries such as steel-making, thermal power generation, be extensive use of high pressure electrostatic precipitation technology and collect the dust that produces in its operation process of removing.Existing high-pressure electrostatic precipitation power supply mostly adopts silicon-controlled voltage regulation, obtain the electrode that negative high voltage power source offers in the dedusting cabinet through transformer and high pressure silicon rectifier produces electrostatic field, when the air that has the dust powder enters electrostatic field, under effect of electric field, dust is adsorbed on the collecting electrode.The weak point of this device is that step-up transformer input supply frequency is low, and volume of transformer is very big, and power-efficient is low.And the dust that is adsorbed on the collecting electrode can not break away from collecting electrode voluntarily, must carry out mechanical type and beat, and enters in the disposal box otherwise be difficult to collect.In addition, also have a strong impact on pick-up performance after dust is adsorbed on the collecting electrode.

The objective of the invention is to overcome the above-mentioned shortcoming of prior art, provide that a kind of volume is little, dust can break away from its dust removing effects that makes that collecting electrode enters in the disposal box after being attracted on the collecting electrode voluntarily and continue the high pressure asymmetrical alternating current pulse dust removal device that keeps good.

The high pressure asymmetrical alternating current pulse dust removal device of realizing the object of the invention is by rectification circuit D, charging current limiter device XL, filter circuit C, bridge inverter main circuit P, high-frequency step-up transformer B, the ground connection collecting electrode, high voltage electrodes for removing dust and current detection circuit And if asymmetric waveform generator PWM form, wherein, the output plus terminal of rectification circuit D be connected in parallel with filter circuit C and bridge inverter main circuit P voltage input end again after charging current limiter device XL is connected in series, the input of the output of bridge inverter main circuit P and high-frequency step-up transformer B joins, an output and the ground connection collecting electrode of transformer B join, another output and high voltage electrodes for removing dust join, the output of the control termination asymmetric waveform generator PWM of bridge inverter main circuit P, current detection circuit If are connected between the input of the signal input part of asymmetric waveform generator PWM and transformer B.During work, D provides pulsating direct current by rectification circuit, through charging current limiter device XL current limliting, obtain DC voltage after the filter circuit C filtering, bridge inverter main circuit P replaces above-mentioned DC voltage the primary coil of input transformer, secondary at transformer then obtains a pulse ac voltage that replaces, when bridge inverter main circuit P adopts pulsewidth two groups of PWM waveforms inequality to drive the forward change of current and the negative sense change of current respectively, then make the output voltage of transformer also be the inconsistent ac pulse voltage of width thereupon, that is to say that the electric field that is added between electrodes for removing dust and the collecting electrode is alternately to change, electric-field intensity is strong and weak and does not wait.When the electric charge of electrodes for removing dust for negative, when collecting electrode is zero potential, the air of band dust enters this electric field, dust will be with negative electrical charge, its direction of motion is to draw close to collecting electrode, is attracted at last on the collecting electrode, thereby plays the dedusting effect.When the electric charge of electrodes for removing dust becomes timing along with the variation of electric field, electronegative dust on the collecting electrode will be attracted by electrodes for removing dust, dust will be shaken off from collecting electrode like this, move to the electrodes for removing dust direction from collecting electrode, and in this motion process, under the effect of self gravitation, drop in the disposal box at last.Thereby played dust agglutination.Finish a circulation.Current detection circuit If detects the transformer primary current, and its output signal line connects the signal input part of PWM.Carry out FEEDBACK CONTROL with If.

That the present invention has is simple in structure, the withstand voltage element in high-pressure side is few, dedusting is easy, efficient is high, integrated, long service life, advantage that cost is low automatically.Particularly it is unique trembles the dirt function automatically, makes to keep clean totally on the collecting electrode forever, thereby makes dust removing effects keep consistency preferably, has avoided influencing dust removing effects because of collecting electrode deposition dust.Being suitable for aspects such as industrial dedusting such as metallurgy, chemical industry, building materials, electric power, oil, demist, recovery non-ferrous metal and using, is traditional desirable renewal product of high-pressure static cleaner.

Below in conjunction with accompanying drawing the present invention is described in further detail.But content of the present invention is not limited in present embodiment.

Fig. 1 structured flowchart of the present invention

Fig. 2 electrical block diagram of the present invention

The electrical block diagram of Fig. 3 single-tube contravariant modulation

Fig. 4 working waveform figure of the present invention

Fig. 5 dedusting principle of electric field of the present invention schematic diagram

Fig. 6 dirt principle of electric field schematic diagram of trembling of the present invention

Referring to Fig. 1,2, high pressure asymmetrical alternating current pulse dust removal device of the present invention is by rectification circuit D, charging current limiter device XL, filter circuit C, bridge inverter main circuit P, high-frequency step-up transformer B, ground connection collecting electrode G, high voltage electrodes for removing dust F and current detection circuit And if asymmetric waveform generator PWM form, wherein, the output plus terminal of rectification circuit D be connected in parallel with the voltage input end of filter circuit C and bridge inverter main circuit P again after charging current limiter device XL is connected in series, the input of the output of bridge inverter main circuit P and transformer B joins, one output of transformer and ground connection collecting electrode G join, another output and high voltage electrodes for removing dust F join, the output of the control termination asymmetric waveform generator PWM of bridge inverter main circuit P, current detection circuit If are connected between the input of the signal input part of asymmetric waveform generator PWM and transformer B.Fig. 2 has provided concrete circuit structure diagram.In the present embodiment, rectification circuit D forms rectification circuit by uncontrollable diode, and charging current limiter device XL is made up of contactor CJ and current-limiting resistance R, and promptly the two ends that are connected to current-limiting resistance R by the normally open contact of contactor CJ constitute.Also can compose in parallel by controllable silicon and current-limiting resistance.Filter circuit C is made up of electrochemical capacitor C1.Also can form by high-pass filter.Asymmetric waveform generator PWM can directly carry out waveform by singlechip CPU by keyboard PG setup parameter and generate automatically.Also can be made up of vibration integrated package such as PWM controllers such as FA5311, SG3525, UC3842 commonly used, bridge inverter main circuit P is served as by " H " bridge inverter of forming with IGBT.Can certainly form bridge type inverse by high speed electronic power switch such as GTR, MSFET.Also can adopt the single tube normal shock or instead swash inversion.Fig. 3 has provided the electrical block diagram of the single-tube contravariant modulation of the PWM generator that adopts the IGBT single tube to make oscillation switch pipe, SG3525 formation.Current detection circuit If continues to use the current sensor of prior art and serves as.During the work of this device, import asymmetric drive waveforms, and alternately change, make its electric-field intensity power of this negative pulse electric field and positive pulse electric field not wait, promptly at exportable forward of output transformer secondary and the inconsistent alternating-current pulse waveform of negative sense width, as shown in Figure 4, when electrodes for removing dust G is electronegative, band dirt air will be deposited to collecting electrode F by negative pulse electric field gravitational attraction in this negative voltage electric field, referring to Fig. 5, when electrodes for removing dust G was positively charged, the dust that is deposited on the collecting electrode F will shake break away from collecting electrode and enter disposal box JX (see figure 6) under the gravitation of positive pulse electric field and self gravitation effect.

Claims (1)

1. high pressure asymmetrical alternating current pulse dust removal device, it is characterized in that described dust arrester is by rectification circuit D, charging current limiter device XL, filter circuit C, bridge inverter main circuit P, high-frequency step-up transformer B, ground connection collecting electrode G, high voltage electrodes for removing dust F and current detection circuit And if asymmetric waveform generator PWM form, wherein, the output plus terminal of rectification circuit D be connected in parallel with filter circuit C and bridge inverter main circuit P voltage input end again after charging current limiter device XL is connected in series, the input of the output of bridge inverter main circuit P and high-frequency step-up transformer B joins, the output of transformer B and ground connection collecting electrode G join, another output and high voltage electrodes for removing dust F join, the output of the control termination asymmetric waveform generator PWM of bridge inverter main circuit P, current detection circuit If are connected between the input of the signal input part of asymmetric waveform generator PWM and transformer B.

Images