JPS62183861A - Electric precipitator - Google Patents

Abstract

PURPOSE:To effectively use electric power without lowering dust collection effect, by dividing the continuous electric energy from one set of DC high voltage generators into a plurality of charge chambers and supplying intermittent charge currents cyclically. CONSTITUTION:Negative DC high voltage from the outer case wall piercing porcelain tube 5 of one set of DC high voltage generators is equally allotted to a plurality of indivisual charge chambers by a high voltage metal duct 7. A high voltage wall piercing porcelain bushing having a DC high voltage thyristor chopper 9 and a turnover voltage counter 10 mounted therein is interposed between the duct 7 and the outer wall 13 of each charge chamber not only to effectively perform the continuity and interruption of a DC current but also to cut off an unnecessary charge current. Therefore, the effective power required by an electric precipitator can be effectively consumed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] The present invention relates to an electrostatic precipitator divided into a plurality of charging chambers.

1. Conventionally, as a power source for an electrostatic precipitator, a Cyrisk is installed on the low voltage side of the applicable frequency power source, a phase control signal is given to it to adjust the power supply and voltage, and an external voltage transformer is used to adjust the voltage to the corona generation voltage. After the pressure is raised, it is converted into an FLf flow using a high voltage rectifier, and then a method is adopted in which high voltage DC is supplied to the charging chamber via a wall plate insulator.

In this means, a DC high voltage having a peak waveform of 100 times at 50 Hz and 120 times at 60 Hz is supplied to the charging chamber as a continuous or periodic intermittent charging current.

Launch! (1) The properties of the dust passing through each charging chamber vary depending on the operating method of the steam canister and furnace, and the amount of dust and dust in the plant may vary. There is a problem in that the charge current and charge pressure must be adjusted each time to ensure dust collection efficiency, which varies greatly depending on the type of dust and the type of fuel.

(2) The amount of collected dust in each charging chamber in a multiple load chamber dust collector is determined by the fact that the upstream chamber has a large amount of dust and the downstream chamber has a small amount. Because of the different pressures, there was a problem in that each charging chamber required a dedicated DC generator.

(3) There is a problem in that a large amount of structural resources are consumed in securing a structure and space for installing the DC high voltage generator on each side of the plurality of charging chambers.

(4) Since it is necessary to start and stop a plurality of high-voltage generators at the same time, or to control the charge flow at the same time, there is a problem in that the control system and control means must be ensured safely.

(5) Since electrical energy is continuously or discontinuously supplied to all of the plurality of load chambers from individual direct current sources, there is a problem in that a large amount of electrical energy is wasted.

(6) When dust particles with high resistance flow into the electrostatic precipitator and are captured, a reverse corona phenomenon occurs at the dust collection electrode, which extremely deteriorates the dust collection effect and wastes power. There was a problem in that it was consumed.

The present invention has been made in order to solve the above-mentioned problems of the conventional art, and its purpose is to provide an electric precipitator with a plurality of charging chambers from one set of DC high pressure generator to a plurality of charging chambers. A means for installing individual wall plate insulators, a high-voltage thyristor switch is installed on the conductor of these insulators, and as a means of effectively conducting and interrupting direct current, we have developed a cutting-edge method for this control. This system uses a voltage waveform counter as a control device to cut off unnecessary charging currents, and is characterized by a means that allows selection of a current interruption mode for each charging chamber.The DC generator required for this is the electrostatic precipitator 1. The object of the present invention is to provide an electric dust collector with one base, one set, the rated capacity M as well as the standard, and the power consumption extremely low.

[Constitution of the invention l σ? The present invention provides continuous electrical energy from a set of DC high voltage generation to a plurality of charging chambers in an electrostatic precipitator using a set of a high voltage thyristor chopper and a peak voltage counter. Each charging chamber is equipped with a wall plate insulator with a built-in insulator, through which a periodically intermittent charged current is supplied, thereby reducing the effective consumption of the effective power required by the electrostatic precipitator. It has the effect of achieving the initial goal safely without adversely affecting the dust collection effect.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

In Figure 1, 1 is a commercial frequency power supply of 50Hz or 60H.
The switch 2 for turning on and off Z is a low-voltage thyristor, and a pulse signal is applied between the date cathodes in order to flow sufficient voltage for corona discharge and constant current necessary for dust collection. 3
is an external voltage transformer, 4 is a high-voltage full-wave rectifier, 5 is a high-voltage equipment storage outer box wall plate insulator, 6 is a shunt, 7 is a high-voltage duct that allocates DC high-voltage energy to multiple charging chambers, 8 is a charged Ichikawa wall plate insulator, 9 1 is a high-voltage thyristor chopper, 10 is a peak voltage waveform counter, 11 is a discharge electrode for corona discharge in the charging chamber, 12 is a dust collecting electrode, and 13 is an outer wall of the charging chamber.

In Figure 12, 14 indicates the high voltage thyristory.
, 15 is a peak voltage waveform counter drive unit, 16 is a potentiometer, 17 is a current interruption signal transmission optical fiber, 1
8 indicates a current interruption switching unit.

In FIG. 1, a negative DC high voltage as shown in FIG. The structure is divided by a high-voltage metal duct 7, and electrical insulation and dust-containing insulation are required between the duct 7 and the outer wall 13 of the charging chamber. It is connected in parallel to each charging chamber via a high-voltage isolation device 8 having a built-in head voltage counter 10.

The charged electric current conducted to the charging chamber by this means causes a corona discharge in the space opposed by the discharge electrode 11 and the dust collecting electrode 12, passes through the grounded dust collecting electrode 12, and passes through the earth to the high voltage rectifying anode. form a reflux to. The details of the high-pressure wall plate insulator 8 during this reflux are shown in FIG. At the same time as the primary switch of the high voltage generator is turned on, a DC corona voltage is induced on the secondary side. This voltage flows through the wall plate insulator 8 of each charging chamber, but at this point the high voltage thyristor trigger unit is not turned on and the corona current to the charging chamber is cut off.

On the other hand, a peak voltage corresponding to the corona voltage is applied to the potencillometer 16 of each wall plate insulator 8 to the ground, and the negative voltage peak value shown in Fig. 3-2 is applied simultaneously to all load chambers. The individual peak voltage counter units 15 count from the first frequency to the eighth frequency, and at the same time, a pulse is emitted for each count value to turn on the high voltage thyristor for each frequency.

This transmission is performed by means of setting a specific value in the counting unit or by a specific signal from the current interruption switching unit 16. As this example, Section 3-2
As shown in the figure, the first charging chamber has the first frequency, and the second charging chamber has the PIS 2 frequency, and the cut-off ratio of the charged current is 173.11.
This means is characterized in that it freely executes the flow cut-off according to the setting of the counter drive unit 15 or the cut-off instruction of the flow cut-off switching unit 18 by selecting the chart means of No. 5. By this means, it is possible to effectively utilize equipment resources and electrical energy and achieve the original purpose without adversely affecting the dust-containing treatment capacity.

[Effects of the invention 1 (1) Equipment and resources can be saved.

(2) The structure can be simplified.

(3) Electrical energy can be saved.

(4) Maintenance costs can be reduced.

[Brief explanation of drawings]

Fig. 1 is a schematic explanatory diagram showing one embodiment of the present invention, Fig. 2 is an enlarged explanatory diagram of the main part thereof, Fig. 3-1 is a diagram showing a commercial frequency waveform and a DC high voltage output waveform, Fig. 3-2 The figure is a waveform diagram of a charged current. 1...Commercial frequency power supply, 2...Low voltage side thyristor,
3...Step-up transformer, 4...High voltage full wave rectifier, 5...
・・High-voltage equipment storage outer box wall board insulated pipe, 6・・Flow divider, 7・
...High pressure duct, 8...Charged city wall plate insulator pipe, 9...
High voltage thyristor tapper, 10... Peak voltage type counter, 11... Discharge electrode for corona discharge, 12... Dust collecting electrode, 13... Outer wall of charging chamber, 14... High voltage thyristor Unit, 15...Peak voltage waveform counter drive unit, 16...Potency cod meter, 17...Current cutoff signal transmission light 7 eyeball, 18...Current cutoff ticket unit.

Claims (1)

[Claims] In an electrostatic precipitator that is divided into multiple charging chambers, continuous waveform electrical energy from a single DC high voltage generator is evenly distributed to the multiple charging chambers to generate periodic intermittent waveform DC high voltage in each charging chamber. An electric dust collector characterized by having a means for supplying energy.