SU831144A1 - Apparatus for sprinkling settling electrodes of electric filters with weir edges - Google Patents

Description

The invention relates to cleaning gas in electrostatic precipitators and can be used in the metallurgical and other fields of industry for cleaning gases from dust and chemical impurities. A device for irrigation of electrodes is known, in which electrode cleaning from deposits is performed by periodically bubbling water with air through tubes with NOR holes in the space between the electrodes. The disadvantages of this device are the danger of overgrowth of nozzles of collecting electrodes i due to which normal irrigation of the settling surfaces is disrupted; the need not only to prevent sedimentation of suspensions, but also to provide a uniform stable film of liquid on the precipitation surfaces and, in addition, the need to avoid spontaneous breakdowns of the gap, the danger of which arises when the bath is excessively boiling and the irrigation liquid is sprayed. The purpose of the invention is to ensure the reliability of the irrigation system when used to irrigate contaminated water, to avoid electrical breakdowns and disruptions of a continuous film of liquid on sedimentary surfaces. In the device, which includes a film irrigation chamber with communications for water supply and spouting tubes with openings located in the irrigation chamber. The goal is achieved by the fact that the ratio of the length of the overflow edge of the precipitation electrode to the pitch of the bubbling holes is 9: 11, and the ratio of the pitch of these holes to their diameter is 30-40.

Ia figure 1 schematically shows the device offered, top view; and FIG. 2 is a section .A-A in FIG. 1,

The non-perforated tubing barbers 1 are located in the camera 2 of film irrigation. The bubbler singing holes 3 are spaced from each other on

distance & equal to 30-40 diameters of these holes. The bubbling holes 3 surround the gooseneck of the collecting electrodes 4. The ratio of the length fi of the overflow edge of the precipitation electrode to the step t of the bubbling holes is 9:11.

A device for irrigating the collecting electrodes of the wet electrostatic precipitators operates as follows.

The bubbling gas is supplied to the manifold 5, from where it enters the bubbling tubes 1.

Since the pressure of this gas exceeds the pressure of the gas in the electrostatic precipitator plus the pressure of the liquid column in chamber 2, it bubbles through the layer of water in this chamber. In this case, gas bubbles prevent (or slow down) the sedimentation of suspensions in the irrigation chamber. Due to certain ratios between the length of the overflow edge of the precipitation electrode, the spacing of the bubbling holes and their diameter, the bath boils intensively enough to slow down the sedimentation of the suspensions, but not so much as to lead to electrical breakdowns.

For bubbling, you can use pure blast furnace gas, which is taken at the outlet of the electrostatic precipitator. The flaB-i of this gas rises in a heater (for example, in a steam ejector).

In blast furnace gas blasting, it is possible to use semi-pure blast furnace gas, taking it out. a high pressure scrubber in which the gas pressure exceeds the gas pressure in the electrostatic precipitator for the pressure drop in the venturi tube (i.e., 2500-3000 Pa). The use of the proposed device makes it possible to use circulating water for the irrigation of electrostatic precipitators with a suspension content of up to 300 mg / l instead of process water. When using known irrigation systems, either technical water or

organization of purification of recycled water up to 20 mg / l.

Claims (1)

1. USSR author's certificate No. 192680, C JU2 B 1/82, 1965. v.j cd: ± FIG. g