高含硫天然气净化装置液硫池废气回用技术研究OA

Objective To meet the SO2 emission requirements of GB 39728—2020 Emission standard of air pollutants for onshore oil and gas exploitation and production industry for tail gas from high-sulfur natural gas purification units,and to address the periodically high SO2 mass concentration in flue gas under high-load conditions and the large latent sulfur content in waste gas from the liquid sulfur pit,a study on waste gas reuse technology of the liquid sulfur pit was carried out.Method By comparing the process feasibility,modification risks,and economy of various technical solutions,such as introducing waste gas from the liquid sulfur pit into the hydrogenation furnace,the Claus furnace acid gas pipeline,the Claus furnace air line,and the Claus furnace itself,the technical route of"introducing waste gas from the liquid sulfur pit into the first zone of the Claus furnace"was selected as the optimal approach.This route was simulated and calculated using Promax software.Combined with industrial application data,the changes in operating parameters,total sulfur recovery rate,and energy consumption of the sulfur recovery unit before and after the modification were systematically analyzed.Result After the modification,the temperature of the Claus furnace remained stable within the range of 1 040-1 070℃,and the outlet temperatures of the primary and secondary reactors met the design requirements.The total sulfur recovery rate increased from 99.907%to 99.939%,and the SO2 mass concentration in the flue gas decreased from 271 mg/m3 to 138 mg/m3,reducing SO2 emissions by approximately 192 tons per year.The overall energy consumption of the unit increased slightly(by 137.6 MJ),but the environmental benefits were significant.Conclusion The key technology of Claus furnace opening construction can provide engineering reference for tail gas emission reduction and upgrading of similar high-sulfur natural gas purification units.