JPH0647082B2 - Charging method for electrostatic precipitator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for charging an electrostatic precipitator (hereinafter abbreviated as EP) using a high voltage pulse power supply.

[Prior Art] FIG. 2 is a view showing an example of a conventional two-stage EP.
3, 07 and 09 are high voltage transformers, 02,
08 is a full-wave rectifier, 04,010 is a rectifier, 05,01
1 is a pulse forming capacitor, 06, 012 is a rotary spark gap, 013 is a two-stage EP, PC ₁ , PC
Reference numeral ₂ indicates a charging portion, and CS ₁ and CS ₂ indicate dust collecting portions.

As shown in FIG. 2, in the conventional two-stage EP, one power source is installed in each room, and the charging unit PC
₁ and PC ₂ are loaded with extremely short high voltage pulses, and direct current or intermittent charge is applied to the dust collecting sections CS ₁ and CS ₂ . For example, in the case shown in FIG. 2, four power supplies are installed, and as the number of rooms increases, that number of power supplies is required.

[Problems to be Solved by the Invention] As described above, in the conventional EP, there is a problem that the cost increases because the number of power sources used increases as the number of EP rooms increases. Further, it is inconvenient because, for example, the EP charging chamber that can be supplied by one power source has a limit of at most two chambers.

The present invention solves the above-mentioned conventional problems, can generate various waveforms with one power supply, and can supply more EP charging chambers from one power supply than before, thereby saving energy. An object of the present invention is to provide a method of charging an EP that can be achieved.

[Means for Solving Problems] An EP charging method according to the present invention is a method of distributing a voltage to an EP discharge electrode and a dust collecting electrode having a charging unit and a dust collecting unit, in which a voltage from an AC power source is supplied. After the voltage is boosted by the high-voltage transformer, a half-wave rectified waveform is alternately generated at the output-side two terminals of the high-voltage transformer through the rectifier circuit, and one output terminal is connected to the charging section through the pulse-forming capacitor and the high-speed switching element. By connecting the other output terminal to the dust collector via a distributor, a high pulse voltage is delivered to the discharge electrode and a high DC voltage is delivered to the dust collector. After boosting and rectifying with
The system is divided into two half-wave direct current systems, two half-wave direct currents and two waveforms having completely different characteristics of a high-voltage pulse by a pulse generation circuit are made from them, and each is divided into a plurality of waveforms. .

[Operation] According to the present invention, a plurality of waveforms having completely different functions can be generated from one power supply, and a plurality of operations can be performed by one power supply. For example, it is possible to supply a required voltage waveform to each of a plurality of chambers (charging unit + dust collecting unit) of the two-stage EP from a single power source.

[Embodiment] FIGS. 1 (A) and (B) are views for explaining one embodiment of the present invention. FIG. 1 (A) is a basic configuration diagram, and FIG. 1 (B) is a first embodiment. Figure
It shows each voltage waveform in the part indicated by the alphabetical symbol in (A).

In FIG. 1 (A), 1 is a thyristor, 2 is a high voltage transformer, 3 is a rectifier, 4 is a rotary spark gap, 5
Is a pulse forming capacitor, 6 is a distributor, and 7 is a two-stage E
P, PC ₁ and PC ₂ are charging parts, and CS ₁ and CS ₂ are dust collecting parts. The motor of the rotary spark gap 4 is the first
For example, a high voltage thyristor is used as the distributor 6 in such a manner that it rotates at 900 rpm in synchronization with the waveform A in FIG. Further, in this embodiment, the rectifier 3
Of the output terminal is divided into two parts so as to have a half-wave rectified waveform, and the pulse forming capacitor 5 and the rotary spark gap 4 are connected to one side of the output terminal, for example, the B side, and the rotary spark gap 4 is connected. By switching to generate an extremely short pulse voltage on the output side on the B side and outputting a waveform as usual on the output side on the A side, one peak intermittent charge is achieved, and two completely different power sources are provided by one power source. It is designed to generate different waveforms.

1 (A) and 1 (B), the waveform G in FIG. 1 (B) is a signal waveform for controlling the firing angle of the thyristor 1. The higher the voltage of this signal, the higher the output voltage. You can change the peak value of the mountain.

The waveform A is a diagram in the case where the crest value is changed by controlling the thyristor 1, and when it is distributed to the dust collecting portions CS ₁ and CS ₂ by the distributor 6, it becomes waveforms E and F.

Waveform B shows the charging voltage waveform of the pulse forming capacitor 5. This is the rotary spark gap 4
Thus, when switching (also serving as a distributor), an extremely short high voltage pulse voltage waveform that rises in several μsec shown in C and D is obtained. Pulse frequency is 30pps (30 shots / se
c). The peak values of the waveforms A to F are controlled so that the charged state of EP is the optimum condition.

The pulse obtained as described above can control and realize both a high voltage and a low current, and is effective in preventing reverse ionization. Further, the waveform A is effective for dust collection of high resistance dust due to intermittent charging and also for energy saving.

[Effects of the Invention] According to the present invention, the following excellent effects can be obtained.

(1) A single power supply can generate multiple waveforms with completely different functions and characteristics, and it is possible to make full use of each characteristic.

(2) It is possible to supply more EP charging chambers than the conventional one from one power source.

(3) Therefore, it is naturally possible to save energy.

[Brief description of drawings]

1 (A) and 1 (B) are views for explaining one embodiment of the present invention, FIG. 1 (A) is a basic configuration diagram, and FIG. 1 (B) is FIG. 1 (A).
FIG. 2 is a diagram showing voltage waveforms at various portions of FIG. 2, and FIG. 2 is a diagram showing a conventional example. 1 thyristor, 2 high voltage transformer, 3 rectifier, 4 rotary spark gap, 5 pulse forming capacitor, 6 distributor, PC ₁ , PC _2, charging section, CS ₁ , CS ₂ ... Dust collector.

Claims (1)

[Claims] 1. A method for distributing a voltage to a discharge electrode and a dust collecting electrode of an electrostatic precipitator having a charging unit and a dust collecting unit, wherein a voltage from an AC power source is boosted by a high voltage transformer and then a rectifying circuit is provided. A half-wave rectified waveform is alternately generated at the two output side terminals of the high-voltage transformer, one output terminal is connected to the charging section through the pulse forming capacitor and the high-speed switching element, and the other output terminal is connected to the distributor. A charging method for an electrostatic precipitator, characterized in that an intermittent pulse high voltage is delivered to a discharge electrode and a direct current high voltage is delivered to a precipitator electrode by connecting to a dust collecting section via a discharge electrode.