SU1736612A1 - Method of cleaning flue gases - Google Patents

Abstract

The invention relates to the field of power engineering and improves the cleaning efficiency of flue gases from high-ash ash by removing part of the flue gas stream after cleaning the latter in an electric precipitator. The withdrawn part is processed by the electron beam in the working part, the result is the required amount of sulfur trioxide for the introduction and processing of flue gases in the duct to the electrostatic precipitator. Introduced into the main gas duct, FZ reduces the electrical resistivity of fly ash, which is trapped in the electrostatic precipitator. The value of the diverted part of the stream is determined according to the calculated expression. 1 il.

Description

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WITH

The invention relates to power engineering and can be used for cleaning flue gases from high-resistance fly ash in furnaces.

The aim of the invention is to improve the efficiency of flue gas cleaning from high-ash ash.

The drawing shows a device for carrying out the method of cleaning flue gases by electron irradiation.

The device comprises a fan 1 in the exhaust duct 2, which connects the cavities of the duct 3 before and after the electrostatic precipitator 4, a distribution chamber, in the wall of which a source of electron radiation 5 is installed. The distribution chamber is made with the secondary (booster) and working parts. The averaging part 6 is made inverse, with the working axis along its axis.

part 7 with a source of 5 electrons. The working part 7 has a cylindrical shape, the input end of which is combined with the output of the source 5 and is installed with a gap relative to the latter.

The device works as follows.

The fan 1 removes part of the flue gases cleared of solid particles in the electrostatic precipitator 4, which through the discharge channel 2 and after their processing by the electron beam in the working part 7 enters the gas duct 3 to the electrostatic precipitator 4. As a result, containing sulfur dioxide, electron irradiation, proceeding radiation-chemical reactions lead to the formation of sulfur trioxide in an amount necessary to reduce the electrical resistivity

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Yu

fly ash and, consequently, its better capture in the electrostatic precipitator 4.

The amount of flow QOTB. flue gas, which is affected by electron irradiation, is determined by 5

QOTB.-

K-Oo C $ 02 1

iCH.

where / is the degree of conversion of S02 to ZOZ upon irradiation (l. 0.8);

QOCH. - flue gas consumption through electrostatic precipitators;

Csoa volumetric (molar) dol S02 in flue gases.

K- (2b-31), - expenditure ratio.

Example. With an S02 concentration in the flue gases of TPPs burning Ekibastuz coal, equal to 650 ppm (gas consumption is 2 million m3 / h), the volume (molar) fraction of the PSF is mainly the flue gas pipe of 30 ppm. The amount of flue gas discharged for irradiation will be "6%.

With a degree of conversion of 302 to a ZOZ in the irradiated gas ottoykogo 0.8 gas absorbed dose will be 0.3 Mrad (3 kJ / kg), while the degree of trapping

7

g

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five

The ash in the electrostatic precipitator increases from 95 to 99.5%.

Claims (1)

DETAILED DESCRIPTION OF THE INVENTION A method for cleaning flue gases containing sulfur dioxide from volatile high-ash ash, which consists in exposing and cleaning the gases in an electrostatic precipitator by electron irradiation, which, in order to increase the cleaning efficiency, after cleaning the flue gases in the electrostatic precipitator a part of the purified stream is withdrawn and is exposed to electron irradiation with the subsequent introduction of this part into the main flue gas stream to the electrostatic precipitator, and the value of the part of the stream is determined according to the expression Q .k  CH. where K (26-31) -10 is the expenditure coefficient; QOCH - flue gas flow rate through the electrostatic precipitator; . Cso2 volume (molar) dol 302 in flue gases; - degree of conversion of S02 to ZOZ upon irradiation.