Gas separation: apparatus – Electric field separation apparatus – Electrode cleaner – apparatus part flusher – discharger – or...
Patent
1997-11-25
1999-08-03
Chiesa, Richard L.
Gas separation: apparatus
Electric field separation apparatus
Electrode cleaner, apparatus part flusher, discharger, or...
96 38, B03C 376
Patent
active
059319895
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY
The present invention relates to a device in an electrostatic precipitator for the suspending, controlling and rapping of one or more collecting electrodes arranged essentially vertically in one or more substantially parallel rows and comprising for each row a substantially horizontally oriented carrier element to which the upper ends of the collecting electrodes are attached, connecting elements which connect the carrier element to the casing of the electrostatic precipitator, control means for controlling the motion of each row of collecting electrodes in the transverse and/or longitudinal direction of the electrostatic precipitator, and a rapping mechanism for rapping the collecting electrodes of each row and comprising a rapping means, such as a rapping hammer, and an anvil connected to the carrier element.
Electrostatic precipitators are usually composed of a plurality of successive precipitation fields through which dust-laden gas is passed to be cleaned. Each of the precipitation fields is divided into a plurality of parallel gas passages by means of a plurality of juxtaposed, earthed collecting electrodes vertically arranged in rows . These are usually in the form of rectangular, substantially plate-shaped, sectional metal sheets. Vertical discharge electrodes, to which a negative voltage is supplied, are arranged in each gas passage. Owing to corona discharges at the discharge electrodes, the dust-laden gas is ionised in the electric field in the gas passages. The negative ions are attracted by the collecting electrodes and, while moving towards these, collide with the dust particles of the gas, which are then charged and separated from the gas by being attracted by the closest collecting electrode, on which they are deposited and build up a dust layer. At regular intervals, the dust layer is loosened, by vibrations, from the collecting electrodes by these being mechanically affected by means of a rapping mechanism. The dust particles then fall into a collecting hopper associated with the respective precipitation fields.
The rapping mechanism can either be arranged at the top or at the bottom of each row of collecting electrodes and usually comprises a rapping hammer acting in a vertical plane about a rotary shaft which extends horizontally in the transverse direction of the electrostatic precipitator and to which the rapping hammer thus is connected, and an anvil. The rapping force for cleaning each row of collecting electrodes is generated by the rapping hammer giving a horizontally directed rap via the anvil to a rapping means cooperating with the collecting electrodes, whereby a horizontal motion is imparted to the rapping means. This motion is transferred to the collecting electrodes in the form of a shock wave which spreads across these. Thus, the dust layer accumulated on the collecting electrodes is loosened.
A greater or smaller amount of the rapping force is absorbed by the suspension of the collecting electrodes during the cleaning operation. The amount of absorbed rapping force depends on the manner of connecting the collecting electrodes to the suspension and on the manner in which the suspension is connected to the casing of the electrostatic precipitator.
The collecting electrodes are usually controlled in the longitudinal as well as in the transverse direction of the electrostatic precipitator so as to be kept in exact positions and, thus, prevent flashovers.
There have been suggested various solutions of a device in an electrostatic precipitator for the suspending, controlling and rapping of its collecting electrodes.
For instance, EP 0 584 880 discloses a device for cleaning collecting electrodes in an electrostatic precipitator by rapping, the collecting electrodes being vertically arranged, successively in parallel rows. The collecting electrodes of each rows are, at their upper ends, attached between a pair of horizontally arranged longitudinal rapping beams and suspended from these, said beams thus also serving as carrier elements for the collecting el
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Chiesa Richard L.
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