RU1801099C - Method for processing gases contenting sulfur dioxide - Google Patents

Abstract

Usage: in the metallurgical, chemical industry. SUMMARY OF THE INVENTION: treating gases containing sulfur dioxide S02 with an accelerated electron beam at a temperature of 20-160 ° C and a gas transmission rate of 0.1-10 m / s with continuous irrigation of the gas stream with circulating sulfuric acid. The method allows the processing of gases containing up to 30 vol.% S02 and any amount of moisture, but not less than the stoichiometric S02: H20 ratio, to produce marketable sulfuric acid. 1 ill.

Description

The invention relates to a method for processing gases containing sulfur dioxide S02 into sulfuric acid and may find application in the metallurgical, chemical and energy industries.

The aim of the invention is to reduce energy consumption and enable the processing of gases containing up to 30 vol.% Sulfur dioxide to produce marketable sulfuric acid.

The gas processing scheme (see drawing) consists of a reactor 1, accelerators 2 electrons, irrigation devices 3, a line 4 for withdrawing commercial products to a warehouse, an acid collector 5, an electrostatic precipitator 6, an acid pump 7, a refrigerator 8, a smoke exhauster 9, and a pipe 10.

The method is carried out as follows.

Gas flow with a concentration of dioxide up to 30 vol.% is fed into reactor 1 with an inlet temperature of 20-300 ° C and any humidity (within the existing technologies related to the formation of sulfur-containing gas streams). Move from below

upward, the gas captures the particles of the irrigating liquid - circulating sulfuric acid, enters the central part of the reactor, where the gas-liquid stream is treated with a beam of accelerated electrons with an energy of 300-700 keV generated by an accelerator of 2 electrons. The process is carried out at a temperature of 20-160 ° C, the gas transmission velocity under the beam of 0.1-10 m / s (depending on its volume, as well as the energy and power of the electron stream) and any humidity of the gas stream, but not less than the stoichiometric ratio S02: H20. Electricity consumption 1.81-0.02 kWh / kg of the obtained monohydrate. As a result of irradiation, sulfuric acid is formed in the gas stream in the form of aerosols and droplets, which are sorbed by irrigation sulfuric acid and removed from the lower part of the reactor 1 to a collector 5, from where they are partially fed to the circulation by an acid pump 7 through a refrigerator 8 and irrigation devices 3 and lines for the withdrawal of commercial products to the warehouse.

Next, the gas stream through the upper part of the reactor 1 is directed to a high-speed

ate

with

2

Ltd

: with

wet electrostatic precipitator 6 with cooled precipitation electrodes for sanitary cleaning of toxic substances and removal of excess moisture, and then released into the atmosphere. The captured product is returned to collection 5. Cleaning efficiency 98%. Get marketable 75% - and 93% sulfuric acid.

Example. A gas stream containing 0.5% vol. Sulfur dioxide, 15% vol. Moisture, the rest air, with a temperature of 30 ° C and a speed of 192 l / min is fed into the reactor, in the central part of which it is affected by a beam of accelerated electrons with energy 325 keV. The gas velocity in the irradiated zone is 5 m / s, and the temperature is 140 ° C. For a more complete removal, as well as additional absorption of sulfur dioxide from the gases, 75% sulfuric acid (recycled product) is supplied in an amount of 1.5 l / m of the gas to be treated upstream from the collector. Conversion 98%. The amount of sulfur dioxide removed from the feed gas stream is 2.76 g / min, which is released from the stream in an amount of 5.5 g / min as 77% sulfuric acid (specific gravity 1.7 g / cmg 5).

From the reactor, the gas stream purified from the bulk of the sulfur dioxide is sent to an electrostatic precipitator, in which

the temperature is kept at 35 ° C and liquid aerosol is removed. The amount of product captured in the form of an aqueous solution (specific gravity 1.005 g / cm is 10 g / min. Next, a gas stream with a moisture content corresponding to the temperature of the gases (35 ° C) is released into the atmosphere.

Thus, the proposed method allows to reduce the energy consumption, increase the radiation-chemical yield, carry out the process in the gas-liquid phase, obtain salable sulfuric acid at a sulfur dioxide concentration in the feed gas of up to 30 vol.%, And ensure sanitary emission standards.

Claims (1)

SUMMARY OF THE INVENTION A method for processing gases containing sulfur dioxide, comprising treating a source gas with an accelerated electron beam in the presence of moisture, characterized in that, in order to reduce energy consumption and enable processing of gases containing up to 30 vol.% Sulfur dioxide to produce marketable sulfuric acid the process is carried out at a temperature of 20-160 ° C, a gas transmission rate under the accelerated electron beam of 0.1-10 m / s and continuous irrigation of the gas stream with circulating sulfuric acid.