Abstract:
Objective Aiming at the operation characteristics of sulfur recovery tail gas treatment unit in natural gas purification plant and the advantages and disadvantages of the existing process, an tail gas treatment process that can adapt to small and medium-sized and large changes in working conditions is proposed.
Methods The alkali liquor desulfurization process was applied to the sulfur recovery tail gas treatment in the natural gas purification plant, and measures such as tail gas NaOH alkali washing "scrubber + desulfurization tower" double tower combined desulfurization, the optimization of incinerator structure, and improvement of sodium sulfate product index were taken.
Results The SO2 mass concentration in tail gas was 10-268 mg/m3 after alkali liquor desulfurization, which met the requirements of GB 39728-2020 Emission standard of air pollutants for onshore oil and gas exploitation and production industry, and the by-product sodium sulfate met the requirements of qualified products and was directly exported.
Conclusions Alkali washing desulfurization can meet the technical and economic requirements of tail gas treatment unit in natural gas purification plant, and has achieved great environmental benefits, which can provide technical reference for similar units.
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