An adjustable process for producing SO3 gas by treating high-concentration SO2 flue gas with an inert catalyst

Abstract

The invention discloses an adjustable process for producing SO3 gas by treating high-concentration SO2 flue gas through applying inert catalyst. The process comprises the following steps: a, primarily heating flue gas containing SO2 with concentration of 13 to 32%; b, feeding the flue gas into an inert catalyst conversion layer to enable a portion of SO2 gas to generate SO3 gas, and exhausting the flue gas after the flue gas reaches a set temperature; c, measuring the concentration of SO2 in the exhausted high-temperature flue gas and carrying out heat exchange treatment; d, repeatedly carrying out the steps (b) and (c) when the concentration of SO2 in the high-temperature flue gas measured in the step (c) is higher than 11 percent; feeding low-temperature flue gas subjected heat exchange into a traditional active catalyst layer to produce high-concentration SO3 gas when the concentration of SO2 in the high-temperature flue gas measured in the step (c) is between 7 percent and 11 percent. According to the process disclosed by the invention, by combining the inert catalyst conversion layer and a traditional active catalyst layer, the SO2 gas with the concentration of 13 to 32 percent can be processed; moreover, the production strength is high, and the process is sanitary and energy-saving.

Description

Technical field [0001] The invention relates to a process for preparing sulfuric acid by a contact method, in particular to a method capable of removing high concentration SO 2 Conversion of gas into high concentration SO 3 Gas, high-strength, clean and energy-saving adjustable application of inert catalysts for high-concentration SO 2 Flue gas production SO 3 Gas craft. Background technique [0002] In the sulfuric acid industry from flue gas, the flue gas used is mainly from SO recovered from environmental protection devices in pyrite, sulfur, non-ferrous metal smelting and metallurgy, coal burning, petrochemical industries, etc. 2 Gas, especially the rapid development of oxygen-enriched air combustion and oxygen-enriched air smelting and the development of environmental protection technology of recycling method, flue gas SO 2 The concentration may reach 13% to 93%. The traditional flue gas sulphuric acid plant with two transfers and two suctions, whether it is a 3+1 or 3+2 proce...

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Problems solved by technology

[0003] The purpose of this invention is to provide a kind of can high concentration SO 2 Gas conversion to high concentration SO 3 Gas and high production intensity, clean and energy-saving adjustable application of inert catalysts to treat high-concentration SO 2 Flue gas production SO 3 Gas process, the process is able to deal with SO 2 Flue gas whose concentration (volume ratio) fluctuates in the range of 13% to 32%, and can handle flue gas whose gas volume fluctuates in the range of 40% to 100%; to solve the problem of SO in flue gas 2 High concentration, large gas volume fluctuations, and the need to use a large amount of air dilution to apply traditional conversion technology involves high investment and inefficient use of energy, etc.

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