Desulfurization of coking off-gases
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The exhaust gas at a flow rate of 600 cubic meters per hour contains approximately 80% H2 and 4000 ppm of H2S; the remainder is trace amounts of nitrogen and methane. Currently, H2S is to be removed (so that its concentration is kept below 300 ppm) before the gas is sent back to the original system for use. The Claus process generally has a large processing capacity, high investment costs, and complex operation. On the other hand, using the complexed iron method for desulfurization leads to an increase in the nitrogen and oxygen contents in the treated gas, which affects its usability. So I’m here seeking help; I hope everyone will be kind enough to offer their advice. Thank you so much!
The sulfur content is too low; neither the Claus process for sulfur production nor the wet process for sulfuric acid production is suitable, and you also need to recover hydrogen and methane. It is recommended that you consider reprocessing hydrogen sulfide after chemical absorption.
A pressure swing adsorption step can be added after dry desulfurization