With the advent of pulse energization in electrostatic precipitators, the need for developing a model to simulate the physical processes in the prebreakdown region, at which the precipitator normally operates, is also increasing. The development of such a model helps in predicting the V I characteristics of a precipitator, which will be important to diagnose the electrical problems associated with the precipitator during its operation. The paper reports the details of a proposed model t o predict the V I characteristics of a wire-plate precipitator operating under the influence of repetitive pulses superposed on a dc bias. The model begins with the calculation of space charge density near the HV electrode during the pulse-on period and then proceeds with the drift of space charges in the pulse-off period aided by the dc bias. The pulse duration was-250 ns. The pulse repetition rate was 50 Hz. The predicted results were validated against the experimental results conducted on a laboratory model of a wire-plate precipitator. The studies were conducted for dust free conditions.
An attempt has been made to study the voltage-current characteristics of a wire-plate precipitator geometry under clean air conditions. Helical wires have been used as corona electrodes. The studies were conducted with DC and DC superposed on nanosecond pulse respectively. The repetitive pulses with a rise time of the order of nanoseconds were generated from a MARX type impulse voltage generator. A comparative study of effect of pulse repetition rate, pulse width and effect of DC bias has been made on the voltage-current characteristics. The obtained results were discussed and compared with previous investigations.
The paper reports results o f investigations o n the behaviour of one section of a prototype electrostatic precipitator subjected to DC and repetitive pulse voltages under clean air conditions. The basic wire-plate precipitator geometry consisting o f a helical wire was energized with DC, repetitive pulse and DC superposed o n repetitive pulse voltage respectively. The results provide basic data o n the behaviour of the geometry under these energizations. These results are o f practical importance in the design of electrode systems of industrial electrostatic precipitators.
Experimental investigations were carried out to study the effect of humidity on the breakdown of rod-plane gaps subjected to both uni-directional and bi-directional oscillatory switching impulse voltages. The humidity ranged from 14.1-36 gm/m3 at a constant temperature of 40' C. The gap subjected to uni-directional 6.3, 10, lQ kHz and bi-directional 4.2, 10,20 kHz oscillatory switching impulse voltages. The gap distance was varied from 8 to 30 cm. The experiments were carried out in a controlled atmospheric room. The results indicate an increase in breakdown strength with increase in humidity. The results are of great relevance at atmospheric conditions existing in Tropical countries.
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