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New breakthrough achieved in reducing hydrogen sulfide levels in gas at Huangling Coal Chemical Company Author/Source: Shaanxi Coking Chemical Co., Ltd. Date: 2022-03-09 Clicks: 15 Good news has come recently from the chemical production unit of Huangling Coal Chemical Company: significant progress has been made in improving the purification of the gas produced there, with zero levels of hydrogen sulfide detected for several consecutive days. According to the managers of the chemical production workshop, hydrogen sulfide is a colorless gas with a pungent odor that is present in the gas produced during coking processes. It is not only highly toxic to humans and its combustion produces exhaust gases that pollute the environment, but gas containing hydrogen sulfide also causes severe corrosion of equipment and pipelines during processing and transportation. When used in subsequent methanol and synthetic ammonia production, it will further cause catalyst poisoning, posing a threat to production safety. Therefore, in industrial production, the hydrogen sulfide level is required to be no higher than 80 mg/m3, with lower levels being preferable. To further improve gas purification and reduce hydrogen sulfide levels, the workshop took measures in various areas such as process control, parameter optimization, equipment renovation, and precise operation. The desulfurization and regeneration integrated tower was repaired and put into use successfully in one go; the primary desulfurization system was isolated for scheduled maintenance. A circular spray system was installed at the top of the regeneration section of the integrated tower, and the temperature of the solution was carefully controlled to maintain an optimal gas-liquid balance with the gas. The amount of chemicals added was adjusted promptly based on the test results of the gas, thereby ensuring both effective parameter control and energy savings. As a result, the hydrogen sulfide content in the gas decreased significantly, and for several consecutive days, its level remained at “zero”.