Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1986-07-08
1987-12-15
Nozick, Bernard
Gas separation
Means within gas stream for conducting concentrate to collector
55 2, B03C 302
Patent
active
047130938
ABSTRACT:
An electrostatic dust precipitator comprises a separation filter (5) having emitter and collector electrodes (4,6), means (1-3) for maintaining a substantially constant d.c. voltage between the electrodes (4,6) during operation of the precipitator, and pulse-generating means (1-3, 7-11) for generating at a given frequency in the order of 30-500 Hz voltage pulses or voltage pulse trains which are superimposed on the d.c. voltage and which are of short duration in relation to the aforesaid frequency. The pulse-generating means (1-3, 7-11) includes capacitive and inductive elements (7,8) which together with the capacitance of the separation filter (5) form an electrical oscillation circuit, and a switching device (9) which is incorporated in said circuit and which is periodically actuatable by a control means (11) for activation of the oscillation circuit (5,7,8). The pulse-generating means (1-3, 7-11) further includes a known voltage-controlled frequency converter (1) which is arranged to generate an a.c. voltage having a frequency which is at least three times higher than the frequency of the voltage pulses or voltage pulse trains, and a single-phase transformer (1) which is connected downstream of the frequency converter (1) and followed by a rectifier (3).
REFERENCES:
patent: 3916284 (1975-10-01), Hilgendorf
patent: 3981695 (1976-09-01), Fuchs
patent: 4152759 (1979-05-01), Hedberg
patent: 4400662 (1983-08-01), Coe
patent: 4533987 (1985-08-01), Tornofugi et al.
Kraftelektronik AB
Nozick Bernard
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