SU1263348A1 - Versions of apparatus for controlling power supply unit of electric precipitator - Google Patents

Abstract

The invention relates to devices for controlling an electrostatic precipitator power supply unit, can be used in the chemical industry and allows increasing the degree of gas purification and reducing energy losses. The device contains a high-voltage controlled rectifier 1, connected through reactor 2 to the corona electrode of electrostatic precipitator 3. Parallel to rectifier 1, controlled switch A is switched on and equipped with control pulse shaper 5. The last input is connected to the output element And 6, the inputs of which are connected to the outputs of the two pulse generators 7 and 8. 2 C. the item of f-ly, 4 ill.

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Claims (2)

.f The invention relates to the electrical cleaning of gases using electrostatic precipitators. The purpose of the invention is to increase the degree of gas purification and reduce energy loss. FIG. 1 shows a diagram of the device, the first option; in fig. 2 - the same, the second option; in fig. 3 - diagrams of operation of the device in the first embodiment; in fig. 4 - the same, according to the second option. The device contains a high-voltage controlled rectifier 1, the output of which through the reactor 2 is connected to the corona electrode of the electrostatic precipitator 3. In parallel, the rectifier is connected to the control key 4, equipped with control driver shaper 5, the input of the latter 6 is connected to the inputs to the outputs of two pulse generators 7 and 8 (Fig. 1). FIG. The 2nd input of the imaging unit 5 is connected to the generator 7, to the control input of which the contact 9 is connected, the relay 10., the coil of which is connected to the output of the second generator 8. The device operates as follows. The rectifier 1 supplies a constant high voltage (30-70 kV) to the electrostatic precipitator 3, under the action of which the electrostatic precipitator 3 purifies gas from dust that accumulates on the electrodes of the electrostatic precipitator 3. The electrodes of the electrostatic precipitator must be cleared of settled dust. This is usually done by shaking mechanisms, in this case due to electrical forces. FIG. 1, the generator 7 generates high frequency pulses (on the order of 25-10 Hz) - V / (in FIG. 3). The generator 7, made on the basis of an asymmetric multivibrator, generates long pulses of low frequency UV (Fig. 3). The approximate values of pulse width T 1 -10 s, pulse repetition period T, T 0.5-f 10 min. These values are determined by the conditions of the electrostatic precipitator (its type, dust content of gases, temperature conditions, type of dust, etc.) and are obtained experimentally. The signals of the generators are multiplied in the circuit And 6 and the input of the generator 5 pulses of control key 4 receives packets of pulses When a pulse arrives at key 4, the latter short-circuits an oscillating circuit composed by reactor 2 and the capacitance of electrostatic precipitator 3, as a result of which an oscillatory double recharge of the electrostatic capacitance occurs. The voltage on the electrostatic precipitator 2 has the shape shown in FIG. 3 - OUSE. Under the action of positive polarity pulses, repulsive forces arise in the dust layer, leading to the destruction of dust lumps and electrode cleaning. FIG. 2, the generator 7 generates low-frequency pulses (VA in FIG. 3) on the order of 1-0.1 Hz, under the action of which "softening of lumps of dust deposited on the electrodes occurs. Periodically, as in FIG. 1, the second generator 8 generates similar pulses (Od of FIG. 4), triggering a relay 10, which, with its contact, closes the control input of the first pulse generator 7, which significantly increases its frequency to 25-100 Hz, which forms a "positive packet pulses leading to dust removal from the electrode. If such refusing positive pulses are not delivered in batches, but continuously and with a sufficiently high (several hertz) frequency, then dust particles deposited on the electrodes will be scattered, which causes a secondary pulverizer that impairs gas cleaning. When using the proposed device, electrodes do not separate dust particles, but dust lumps, thereby improving the degree of gas purification. Claim 1. A device for controlling an electrostatic precipitator power supply unit comprising a rectifier that is connected through a reactor to a corona electrode and in parallel with which a control key is connected, equipped with a control pulse driver, whose input is connected to the first pulse generator, characterized increasing the degree of purification and reducing energy losses, it is additionally equipped with an AND circuit and a second low-frequency wide pulse generator, the output of which is connected to the first input And we, to the second input of which the output of the first generator is connected, and the output of the circuit AND is connected to the input of the driver. 2. A device for controlling an electrostatic precipitator power supply unit containing a rectifier, which is connected via a reactor to a corona electrode and in parallel with which a control key is connected, equipped with a control pulse former, the input of which is connected to the first pulse generator, characterized in that cleaning gas and reducing energy loss, it is additionally equipped with a second pulse generator and a relay, and a relay contact is connected to the control input of the first generator connected to the output of the second generator. FIG. 2 L and 11111111 and I and m 11111 I and I and and I and 111111 and i I MIN pi iiin y r in FIG. k