Method and apparatus for supplying voltage to high-ohmic dust electrostatic precipitator

An apparatus for supplying voltage to a high-ohmic dust electrostatic precipitator having corona-forming and precipitation electrodes, comprising:

• a step-up transformer having a primary winding connected to a supply line, and a secondary winding having one output terminal grounded;
• a thyristor controller placed in series in the primary winding circuit of said step-up transformer, and having an input;
• a switching device including:
• a first transit pentode having a cathode lead and an anode lead, and a control solenoid whose axis is perpendicular to the axis of this transit pentode;
• a second transit pentode having a cathode lead and an anode lead, said cathode lead of said second transit pentode being connected to the anode lead of said first transit pentode and a second terminal of the secondary winding of said transformer, and the anode lead of said second transit pentode being connected to the cathode lead of said first transit pentode, the common lead of said transit pentodes being connected to said corona-forming electrode of said electrostatic precipitator, and said second transit pentode having a control solenoid whose axis is perpendicular to the axis of this transit pentode;
• a regulating unit incorporating a protection unit provided with a thyristor key and having a control electrode and a lead connected to said input of said thyristor controller;
• and
• a control unit including:
• a master oscillator having two outputs, one of said outputs being connected to said control electrode of said thyristor key of said protection unit in said control unit;
• a flip-flop having an input connected to a second of the outputs of said master oscillator, and output;
• and
• two power amplifiers, each having an input connected to one of the outputs of said flip-flop, and two outputs connected to a corresponding control solenoid of a respective pentode.

An apparatus for supplying voltage to a high-ohmic dust electrostatic precipitator having precipitation and corona-forming electrodes, comprising:

• two step-up transformers, each said transformer having a primary winding for connecting to a supply line, and a secondary winding;
• two thyristor controllers, each said thyristor controller being placed in series in the primary winding circuit of a corresponding step-up transformer, and having an input;
• two high-voltage rectifiers, each said rectifier being placed in a circuit of a corresponding step-up transformer, and having two high-voltage leads of opposite polarity, the positive high-voltage lead of a first high-voltage rectifier and the negative high-voltage lead of a second high-voltage rectifier being grounded;
• two transit pentodes connected in series with one another and each having a lead electrically connected to said corona-forming electrode of said electrostatic precipitator and the other transit pentode, a lead electrically connected with a respective high-voltage rectifier, and a control solenoid whose axis is perpendicular to the axis of the corresponding transit pentode;
• two regulating units, each said regulating unit incorporating a protection unit provided with a thyristor key having a control electrode and two leads, each said lead being corrected to said input of said corresponding thyristor controller;
• and
• a control unit including:
• a master oscillator having three outputs, of which two outputs being connected to said control electrode of said thyristor key in the protection unit of said corresponding regulating unit;
• a flip-flop having an input connected to the third output of said master oscillator, and two outputs;
• and
• two power amplifiers, each said power amplifier having an input connected with one of the inputs of said flip-flop, and two outputs connected to a corresponding transit pentode.

An apparatus for supplying voltage to a high-ohmic dust electrostatic precipitator having precipitation and corona-forming electrodes, comprising:

• a power source having an input and two high-voltage leads of opposite polarity;
• a high voltage switch to switch said high-voltage leads of said power source, and having two control coils and an output electrically connected to the corona-forming elecrode of said electrostatic precipitator;
• an electric field intensity transducer having two leads, one of said leads being connected to the precipitation electrode of said electrostatic precipitator;
• and
• a control unit including:
• two diodes, each having a positive and a negative lead, the positive lead of a first diode is connected to the negative lead of a second diode and a second lead of said electric field intensity transducer;
• a comparison circuit having two inputs, a first input connected to the negative lead of said first diode, and a second input of said comparison circuit being connected to the positive lead of said second diode, and two outputs;
• and
• two amplifiers, each having an input connected to the corresponding output of said comparison circuit, and an output electrically connected to said corresponding control coil of said high-voltage switch.