SU1230645A1 - Apparatus for cleaning gases - Google Patents

Description

The invention relates to the metallurgical, chemical and other industries of the industry and is intended for the purification of industrial gases from fine hydrophobic dusts.

The purpose of the invention is to increase the degree of dust trapping with a hydrophobic surface.

1 shows a device, a general view ;, FIG. 2 - ejector structures.

The device consists of a vertical case 1 with a liquid bath 2. Inside the case there is a vertical inlet gas line 3 for supplying the gas to be purified with a pipe 4 for supplying saturated steam installed along the gas flow and with an ejector 5 installed behind the pipe 4. At the top of the case a nozzle 6 is installed to exit the purified gas.

The ejector 5 is made in the form of a pipe 7 with an annular gap 8 with an angle of inclination. 30 - 45 to the axis of the gas flow and a width determined by the formula:

one .". ,

 T3-4) Z7F

to

0.1 - 0.3

K - slot width, mm;

5 - wall thickness of the ejector, mm; t is the length of the forming gap, mm; P -; air pressure in the jacket of the ejector, at.

The rubapps 9 serve to supply compressed air to the ejector. The operation of the device is as follows.

Exhaust gases from the hydrophobic dust of the drying furnaces enter the gas pipeline 3. To destroy the air envelope of the dust particles through the pipe 4, saturated steam is supplied with a temperature of 120-140 ° C and a pressure of 5 atm.

The formed humidified flow ha: EA due to the saturation of dust particles with steam enters the ejector 5 at a speed of P m / s. In the ejector 5 in the zone of the compressed air exit, due to the interaction of two opposite gas and compressed air flows, having a speed of 16 m / s, the temperature decreases and the gas flow is intensely turbulized.

s

0

0

,

As a result of a sharp decrease in the temperature of the gas stream to vapor, it is intensely condensed and as a result of the diffusion interaction of the particles of moisture and dust and the turbulization of the gas stream, the dust particles are enlarged along the gas in the vertical gas pipeline. At the same time, due to the presence of an inclined slot 8, the gas flow is accelerated, as in high-speed washers.

The accelerated gas flow with the enlarged dust particles enters the lower part of the device, where it collides with the surface of the gas cleaning liquid, rubbed upon impacting most of the energy, precipitating the dust particles. At the same time, the gas due to the forces of gas-friction mechanically captures the top layer of liquid and breaks up into tiny droplets and foam, which have a large total active surface for sedimentation of the remaining dust particles in the gas stream. , 25 m / s and the annoyance of dust particles. The cleaned gas is removed through the nozzle 6. The angle of inclination of the annular gap 8 of the ejector is selected depending on the dilution in the flue gas duct directed for cleaning and is 30-45 °. A change in the angle of inclination below 30 leads to a decrease in the vacuum in the mixing gas line 3 after the ejector. A change in the angle of inclination above 45 leads to a decrease in the vacuum in the pipeline before the ejector.

In order to eliminate the influence of the internal surface of the pipeline 3 on the velocity of the ejecting air, the width of the slit of the ejector is determined by the formula:

K 0.1 - 0.3 -,

 (3-4) 17

five

five

where K is the width of the slit, mm;

° - the thickness of the walls of the ejector, mm; I - the length of the forming gap, mm; P - air pressure in the jacket of the ejector, at.

The table shows the dependence of the angle of inclination of the ejector gap to the flow axis on the degree of dust collection.

-R

Compiled by O. Bekker Editor K. Voloshchuk Tehred N. Bonkalo Proofreader A. Ferentz

Order 2475/9 Circulation 663 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

7

R

FIG 2

Claims (1)

DEVICE FOR CLEANING GASES, including a housing with an inlet gas pipeline and a nozzle for exhaust gases, a liquid bath, which requires that, in order to increase the degree of dust collection with a hydrophobic surface, it is equipped with a nozzle for supplying saturated steam installed in the inlet gas pipeline , 'placed along the gas flow, and an ejector behind it, made with an annular gap inclined at an angle of 30 - 45 ° to the axis of the gas flow, and a jacket for supplying compressed air. SU, „1230645 Fig.!.