RU2761334C1 - Electrofilter - Google Patents

Abstract

FIELD: electrostatic gas cleaning.

SUBSTANCE: device includes a housing, collecting electrodes, discharge electrodes, a high voltage source. The corona elements are in the form of a groove with rounded longitudinal edges. Corona needles are located inside the groove. The groove and needles are directed towards the collecting electrodes at an angle of 20° to 80°.

EFFECT: degree of gas purification increases, the dimensions of the device decrease.

1 cl, 2 dwg

Description

The invention relates to electrostatic precipitators for the purification of industrial gases and can be used in electrostatic precipitators installed at thermal power plants, in cement, metallurgical and other industries. Known electrostatic precipitators are used in various industries for gas purification. These electrostatic precipitators use different types of corona elements, the electric wind from the used corona elements is directed in almost all directions, which creates turbulization of the gas to be cleaned. This practically does not allow increasing the efficiency of the deposition of dust particles from the action of the electric wind. Electrostatic precipitators using these crown elements are large in size, and their degree of gas purification is often insufficient.

Known electrostatic precipitators PGDS, UG, EG, etc. (see Levitov V.I., Reshidov I.K., Tkachenko V.I. -1, 11-3) with C-shaped collecting electrodes and needle corona electrodes, the needles of which are oriented perpendicular or parallel to the plane of the collecting electrodes. Modern domestic electrostatic precipitators such as EGBM and EGV, have an increased efficiency of deposition of dust particles. However, these electrostatic precipitators, despite the increased degree of gas purification, have large dimensions and do not always provide the required degree of purification. The needles of the needle corona elements of these electrostatic precipitators are oriented towards the collecting electrodes or parallel to them. This promotes turbulization of the cleaned dust and gas flow and practically weakly increases the efficiency of the electrostatic precipitator. Often, when replacing outdated electrostatic precipitators with electrostatic precipitators of the EGBM and EGV type, it is necessary to increase the dimensions of the existing electrostatic precipitators, for example, by increasing their height (two-level electrostatic precipitators of the EHD type) or by adding the length of the core. (See Chekalov L.V. Ecotechnics. Yaroslavl, Rus. 2004, p. 317). The technical problem of the present invention and the technical result achieved by its solution are to increase the degree of gas purification by an electrostatic precipitator and to reduce its dimensions.

The specified technical effect is achieved by the fact that the electrostatic precipitator, consisting of a body, collecting electrodes, discharge electrodes and a high voltage source, differs in that the elements of the discharge electrodes have the shape of a trough with rounded longitudinal edges, and inside the trough there are discharge needles, and the trough and needles are directed to the collecting electrodes at an angle of 20 ° to 80 °.

The surfaces of the gutters that reflect the electric wind further intensify the electric wind in directions that facilitate the movement of the captured particles towards the collecting electrode. In addition to these options, in special cases, the orientation of the corona elements can be performed in groups or alternately by each corona element separately, as well as at different angles in the range from 20 ° to 80 ° to the plane of the collecting electrodes, depending on the properties of the dust and gas environment to be cleaned. The specified technical effect is achieved by the fact that due to the presence of the concave bearing part of the corona elements and the installation of corona needles in it, an additional specially directed electric wind is created in the interelectrode gap of the electrostatic precipitator. This creates the movement of gas streams that contribute to the effective deposition of dust particles. When the chute with the needles is directed at angles to the collecting electrode less than 20 ° or more than 80 °, the effect of the electric wind on the increase in the degree of gas purification becomes negligible. These features are essential and interconnected with the formation of a stable set of essential features sufficient to obtain the required technical result. The possibility of carrying out the invention, characterized by the above set of features, as well as the possibility of realizing the invention, can be confirmed by the description of the design options for electrostatic precipitators made in accordance with the invention, the essence of which is illustrated in FIG. 12.

The list of items in FIG. one:

1 - concave bearing part of the corona element;

2 - rounded side part of the corona element;

3 - needle of the corona element;

4 - a jet of electric wind;

5 - additional reflected jet of electric wind. The list of items in FIG. 2:

6 - stream of gas to be cleaned at the inlet to the interelectrode gap;

7 - precipitating electrodes of the electrostatic precipitator;

8 - discharge electrodes of the electrostatic precipitator;

9 - gas flow in the interelectrode gap;

10 - swirls of the dust and gas flow in the interelectrode gap.

FIG. 1. shows a cross-section of the corona element of the proposed electrostatic precipitator and the electric wind jets 4 and 5 created by this element. The shielding plate of the corona element 1 is made of a concave shape (groove) to create additional reflected electric wind jets. The needles 3 of the corona element are directed outward of the concave surface of the corona element. The longitudinal edges of the corona-forming elements are rounded in the lateral part of the corona-forming element 2 to exclude their corona formation.

FIG. 2 shows a cross section of one interelectrode gap of the proposed electrostatic precipitator. It receives a dust-and-gas stream of the purified gas 6. In the middle between the collecting electrodes 7, there are corona elements 8, which are directed at an angle to the plane of the collecting electrodes from 20 ° to 80 °. The cleaned dust and gas flow 9 is close to the collecting electrode and forms vortices due to the action of jets of electric wind 10. In existing electrostatic precipitators, jets of electric wind are directed across and along the dust and gas flow and their effect on particle deposition is insignificant. The operation of the proposed version of the electrostatic precipitator in Fig. 2 lies in the fact that the stream, enhanced by the presence of the main and reflected jets of the electric wind, moves the dust particles to the collecting electrode at a higher speed. This increases the net drift velocity of the dust particles. This increases the degree of gas purification and reduces the dimensions of the electrostatic precipitator. One of the important advantages of the proposed electrostatic precipitator is the simplicity of its implementation for new devices, as well as during their reconstruction. The present invention is industrially applicable, since its manufacture does not require special equipment and new technologies. The electrostatic precipitator design described in this example and shown in the graphic material is not the only one possible to achieve the above technical result and does not exclude other options for its manufacture included in the independent claim.

Claims (1)

Electrostatic precipitator, consisting of a body, collecting electrodes, discharge electrodes and a high voltage source, characterized in that the elements of the discharge electrode have the shape of a trough with rounded longitudinal edges, there are discharge needles inside the trough, and the trough and needles are directed to the collecting electrodes at an angle of 20 ° up to 80 °.

Images