SU929224A1 - Apparatus for separating dust particles out of gas flow - Google Patents

Description

(54) DEVICE FOR DUSTING THE PARTICLES OF DUST

one

. The invention relates to the field of separation of particles from gases using an electrostatic effect and can be used as a first field in electrostatic precipitators for purifying gases with a high initial concentration of dust in industrial materials, heat and power, metallurgy and other folk industries.

A device for cleaning gases is known, comprising a body in the form of a partially perforated pipe, a corona wire, located along the axis of the pipe, and a slit nozzle for radial gas injection {i.

A disadvantage of the known device is the low efficiency of the dust collection process.

The closest in technical essence and the achieved effect to the invention is a device for separating particles from a gas stream, including a case, a precipitating electrode in the form of OUT OF GAS FLOW

figured gutter, from the open side of which there is a slit nozzle across the entire height, high-voltage electrodes placed inside the collecting electrode at different points of its j / 2 bend.

The disadvantage of this device is the low efficiency of dust collection of secondary dust mowing.

The purpose of the invention is the elimination of the effectiveness of dust collection due to the reduction of secondary entrainment dust.

This goal is achieved by the fact that a part of the side walls of the nozzle is made in the form of blinds, while the device is equipped with additional gas-permeable

15 by the deposition electrodes, placed in the cavity of the precipitating electrode at different points of its bending.

In addition, the shawl nozzle output edge is adjacent to the side wall

20 precipitator electrode.

FIG. 1, the proposed device, plan view (first embodiment); in fig. 2 - the same, second 3 option; in fig. 3 - the same, the third option; in fig. 4 shows section A-A in FIG. 3 in FIG. 5 is a section BB in FIG. 3. The device consists of a housing 1, in which the precipitating epochs 2 are installed in the form of figured grooves (in Fig. 1 two electrodes are shown in the row). A slotted nozzle 3 is installed opposite the open side of the precipitation electrode 2 and equipped with a tapered nozzle 4 with a slot exit 5 and louvered walls 6. The edge 7 of the louvered wall b approaches the edge 8 of the precipitation electrode 2. Inside the axis electrode 2 and on the outside of the nozzle 4 of the nozzle 3, additional gas permeable precipitating electrodes 9, 1, for example, are placed in the form of tensioned strings, rods alternating with gaps. Between the side walls of the nozzle 3, nozzle 4 and additional electrodes 9, electrodes 1O are placed at a high potential, connected to the negative pole of the power source. The positive pole of the power source, collecting electrodes 2 and nozzle 3 with nozzle 4 are grounded (not shown). Two or more collecting electrodes 2 can be arranged in a row. When docked in a row between the electrodes 2, a slit 11 is formed for the exit of the purified gas from the device in order to pass, giving it the slightest cleaning. The second version of the device differs from the first one by the arrangement of additional collecting electrodes 9 inside the electrode 2. I Both of these options are used to purify gases with a large content of the fine fraction of dust. With a smaller content of fine fraction in the gases of the dust, the third version of the device can be used. two, that inside the collecting electrode 2 there is one set of electrodes 10 at high potential, connected to the negative pole of the power source. Electrode 2 is provided with inclined shelves 12, which form a bunker 13 with its walls. Between the walls of electrode 2 and the edges of inclined shelves 12, a vertical channel 14 is provided, which is screen 15 from air vortices. The proposed device works as follows. 4 When a high voltage is applied from the negative pole of the power source to the electrodes 10 between the electrode 10 and the surfaces of the collecting electrode 2, the nozzle 3, the louvered walls b and the additional collecting electrodes 9, a high voltage electric field is generated. When the device is operated in electrostatic precipitators with pre-charging of dust particles, the electrode 10 can be either coronating or uncorroded | When cleaning gases from dust with a high resistivity, the electrode 1O is preferably non-corrosive, in order to avoid the appearance of a back corona. When the device is operated in an electrostatic precipitator pax without pre-charging dust particles, the electrodes 1O must be corona-forming. Thus, depending on the characteristics of the aerosols to be cleaned, any design of the electrode 10 is selected, providing a predetermined mode of operation. The proposed device works as follows. The gases to be cleaned flow at a high speed into the nozzle 3 and the nozzle 4. The velocity of the gases at the entrance to the nozzle 3 and the exit from the slot 5, the nozzle 4 should be approximately the same. As the gas moves in the nozzle 4, the greater part of the gas under the action of the thrust force passes through the slots of the louvered walls 6, a smaller part of the gas through the slot 5, the nozzle 4 enters the deposition zone of the precipitation electrode 2. The living section of the louvered walls b is much larger than the living section of the slot 5. Therefore, the velocity of the gas passing through the louvered walls is: many times less than the velocity of gas outflow from slot 5 of nozzle 4. Dust particles with high inertia continue their way with the gas flow moving to slot 5. 5 and nozzle 4, dust concentration is significantly increased. Those charged fine particles that pass along with the greater part of the gas to be purified through the louvered walls b are exposed to a non-uniform electric field of high radiation and intensively deposited on the walls b. With further movement

The gas flow to exit 11 is similar to the deposition process at the additional collecting electrodes 9. A smaller part of the gas at high speed and high concentration of dust leaves through the slot 5 nozzle 4 and moves along the side wall into the cavity of the precipitation electrode 2. Since the amount of gas leaving from the slot 5 is small, its speed in the cavity of the precipitation electrode 2 drops sharply. Charged dust particles (in the device with pre-charged dust) under. the action of the electric foam is pressed against the wall of the electrode 2, along which it moves due to inertial forces. In the absence of pre-charging, the electrodes 10 are coronafied, the charging and deposition zones of the particles are in this case combined. The bulk of the dust as it moves away from the slit 5 under the action of gravity falls into a dust collecting bin (not shown), part of the dust is deposited on the surface of electrode 2 under the action of the electric field, and a smaller fraction is deposited on additional collecting electrodes 9, the electric field in the zone the deposition of which is highly heterogeneous.

From the cavity of the electrode 2, the purified gas, which is attached to the gas that has passed through the louvre walls 6, moves along exit G1 to the next stage of cleaning.

In the second embodiment of the device, the purification of the dusty gas is carried out in the same way as in the device according to the first embodiment.

In case of gas cleaning in the device according to the third variant, the collected dust is removed from the cavity of electrode 2 by means of shelves 12 and bins 13. When regenerating electrodes, dust along the vertical channel 14 is dumped down into a dust collecting bin. From secondary pyleounos channel 14 zashshtsen partition 15 installed along the entire height

electrode.

The advantage of the proposed geo-device is that it provides an increase in the affective temperature of the device by reducing the speed

gas flow to the positel of the electrode electrodes.

Claims (2)

1. A device for isolating ijacTHU. dust from the gas flow, including a cortex, a precipitating electrode in the form of a figure-shaped trough, from the open side of which a sprue nozzle is located at full height, and high-voltage electrodes placed inside the precipitating electrode at different points of its vzhnba, about t and l., chained Increasing effective Hi dust baths by reducing secondary dust loss, part of the side walls of the nozzle is made in the form of louvers, while the silt: C (1Lo / exit edge prints to the side wall of the precipitation electrode. 2. The device according to claim 1, wherein the device is provided with additional gas-permeable collecting electrodes placed in the cavity of the precipitating electrode at different points of its zigb. Sources of information | a1, taken into consideration prn examination 1. USSR Author's Certificate No. 589025, cl. In OZ From 3/40, 1978. 2. USSR author's certificate No. 77664, cl. OZ C 3 / O2, 198O. (prototype). . 5 9 10 10 Central Bank H 7 8 3 Yu Yu 2 I 1/111 I / / / % / / ||. hhh soo cxV wow about  ,, Ltd- ir "" "" e "if" "" h LA / Hl x xxxxxx FIG. 1 8 5 r / o. F1lg.5