Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1989-01-11
1990-03-20
Nozick, Bernard
Gas separation
Means within gas stream for conducting concentrate to collector
323903, 55105, B03C 302
Patent
active
049098128
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to energy converters and more specifically, to devices for power supply of electrical precipitators used in gas cleaning.
PRIOR ART
The most widespread use has been found up until now by the unipolar power supply installations for electrical precipitators which suffer from lower efficiency of dust catching and gas cleaning and an increased volume resistance of the precipitated dust layer, exceeding 10.sup.9 Ohm cm. Thus, the precipitated dust layer has not enough time to discharge, so that its charging process proceeds until the dust layer gets broken down, and a back corona discharge occurs. As a result, the break-down voltage of the interelectrode gap in the electrical precipitator is reduced and gas cleaning efficiency is affected. In addition, unipolar power supply installations built around single-phase transformer-rectifier circuits feature but low installed power utilization factor.
Moreover, spark- and arc-discharges are liable to arise in the course of the electrical precipitator operation, which affect adversely the operational reliability of the gas-cleaning electrical precipitator as a whole. To restrict the resultant transient short-circuit currents, use is made of current-limiting reactors or magnetic amplifiers featuring high reactance, whose power makes up to one-third the useful power of the power supply installation itself, whereas their useful function is utilized only at short intervals when spark-or arc discharges occur. Application of high reactance by inserting into the power circuit current-limiting reactors or magnetic amplifiers leads to overrated installed power of the device and to the doubled output voltage during idle run of the device.
Extensively known in the art is a device for power supply of gas-cleaning electrical precipitators, featuring unipolar power supply and comprising a mains-fed current-limiting reactor and series-connected a thyristor controller, a high-voltage single-phase transformer, and a bridge rectifier one of whose poles is grounded, and the other is connected, via a limiting reactor, to the corona-displaying electrode of the electrical precipitator (cf. G. M. A. Aliev, Power packs of electrical precipitators, 1981 Energoizdat Publishers (Moscow), p.55, FIG. 29 (in Russian). The electric precipitator is provided with a power-operated system of shaking the precipitating electrodes, which is put in operation at certain time intervals by the actuating mechanism.
Efficiency of gas cleaning in the electrical precipitator in terms of the rate of precipitation of charged dust particles on the precipitating electrode, depends on the shape of pulses of working voltage applied to the electric precipitator. In its turn, the working voltage depends on the rectification method, principle of regulation of this voltage, level of the output parameters of the device, and its external-volt-ampere characteristics. A highly pulsating voltage, though capable of quenching arc discharges occurring across the interelectrode gap of the electrical precipitator, affects badly the efficiency and other power characteristics of the device, such as installed power utilization factor.
When cleaning gases containing high-resistance dust particles, an increase in the voltage and current results in a higher degree of gas cleaning until a certain critical value of the output parameters is attained, at which the back corona discharge process occurs. As a result, the effectiveness of the power supply device is impaired.
In the device under consideration the voltage of the electrical precipitator is adjusted against the average number of spark breakdowns through the precipitator interelectrode gap. This results in an unstable operation of the device, excess power consumption and adversely affected effectivity of the gas cleaning technological process, since an optimum number of the interelectrode gap spark breakdowns is determined by the parameters of the gas flow being cleaned, i.e., moisture content, chemical composition, and dust particle size distr
REFERENCES:
patent: 3641740 (1972-02-01), Schumann
patent: 4183736 (1980-01-01), Milde
patent: 4536698 (1985-08-01), Shevalenko
patent: 4567541 (1986-01-01), Teral
Ermilov Igor V.
Khomsky Iosif G.
Lisin Vladimir N.
Mareev Vladimir E.
Mirzabekyan Garri Z.
Nozick Bernard
Vsesojuzny elektrotekhnichesky institute imeni V.I. Lenina
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