Combustion and catalytic reduction method for acid gas

Abstract

The invention provides a combustion and catalytic reduction method for acid gas, which comprises the following steps: firstly, carrying out heat combustion reaction on the acid gas and fuel in a combustion chamber; secondly, carrying out catalytic reduction and hydrolysis reaction on the obtained combustion product; and thirdly, combusting part of gas obtained by the catalytic reduction reaction, and returning part of the gas to the combustion chamber for combustion. The combustion and catalytic reduction method for the acid gas has no strict requirement on the combustion, does not need multistage Claus reaction, and even does not control the Claus reaction strictly; the combusted product is condensed to produce sulfur; and the condensed gas is controlled by an online sulfur dioxide or a hydrogen sulfide analyzer, part of the condensed gas enters a catalytic reduction device, and part of the condensed gas returns to a combustion device to re-combust tail gas so as to reduce hydrogen sulfide in the combusted tail gas to a lower level.

Description

technical field [0001] The invention relates to an acid gas combustion and catalytic reduction method, in particular to a process of high-intensity premixing and excessive combustion of acid gas and a catalytic reduction of hydrogen sulfide in acid gas to sulfur dioxide and generation of sulfur and catalytic reduction products Return to the multi-step process of combustion. Background technique [0002] The conventional acid gas desulfurization process is to use acid gas or concentrated acid gas through high-temperature Claus combustion to obtain sulfur dioxide and convert sulfur dioxide into elemental sulfur through strict control of the ratio of air and acid gas, and finally incinerate and discharge. This process generally includes ordinary Claus, super Claus, super excellent Claus and Scote, etc., with large investment and high operating costs. The main method generally requires two-stage or multi-stage Claus reaction, and it can also meet the national emission standards...

AI Technical Summary

Problems solved by technology

This process generally includes ordinary Claus, super Claus, super excellent Claus and Scote, etc., with large investment and high operating costs. The main means, generally requires a two-stage or multi-stage Claus reaction, and it can also meet the national emission standards by adding a large amount of air after incineration

However, the Claus combustion control conditions are harsh, and the conversion rate of sulfur dioxide and the recovery rate of sulfur will not be very high due to the thermodynamic balance, and the operating flexibility is very small.

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