| 摘要: |
| 目的 解决直接选择氧化硫磺回收装置的总转化率、选择性及硫回收率下降和下游尾气处理装置碱耗偏高等一系列问题，保证装置的高效运转。方法 分别对直接选择氧化硫磺回收装置等温和绝热两级反应器的运行现状进行了分析，并提出了更换绝热催化剂的解决方法，通过调研和开展室内实验，最终选定氧化硅基催化剂，并进行了绝热催化剂的更换。结果 绝热催化剂更换为氧化硅基催化剂后，绝热转化率和选择性均大幅提高，相较于更换催化剂前，绝热转化率和选择性均提升55个百分点以上，相较于原氧化钛基催化剂运行初期，绝热转化率提升了17.10个百分点，绝热选择性提升了31.54个百分点，且绝热催化剂在反应过程中表现出较高的活性和抗过氧化能力。相较于更换催化剂前，硫磺回收装置总转化率、选择性和硫回收率提升至95%以上，碱液消耗量降低了16 m3/d；相较于氧化钛基催化剂运行初期，总转化率、总选择性和硫回收率提升了1~3个百分点，碱液消耗量降低了11 m3/d。结论 绝热催化剂更换为氧化硅基催化剂后，排放尾气中SO2质量浓度明显降低，稳定维持在100 mg/m3以下，具有显著的环境效益。 |
| 关键词: 硫磺回收 直接选择氧化脱硫 转化率 选择性 氧化硅基催化剂 |
| DOI：10.3969/j.issn.1007-3426.2024.06.005 |
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| Catalyst operation evaluation of direct selection oxidation sulfur recovery unit |
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GAO Chunhua, LIU Renjie, ZHAO Hongliang, WEI Wei, SONG Guiqin, LI Xiaolu
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No.1 Gas Production Plant, PetroChina Changqing Oilfield Company, Yulin, Shaanxi, China
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| Abstract: |
| Objective The aim is to solve a series of problems such as the decrease of total conversion rate, selectivity and sulfur recovery rate of direct selection oxidation sulfur recovery unit and the high alkali consumption of downstream tail gas treatment unit, so as to ensure the efficient operation of the unit. Methods The operation status of isothermal and adiabatic two-stage reactors of direct selection oxidation sulfur recovery unit was analyzed, respectively, and the solution of replacing adiabatic catalysts was proposed. Through investigation and laboratory experiments, the silica-based catalyst was finally selected and the adiabatic catalyst was replaced.Results After replacing the adiabatic catalyst with a silica-based catalyst, both the adiabatic conversion rate and selectivity were greatly improved. Compared with the previous catalyst, the adiabatic conversion rate and selectivity were increased by more than 55 percentage points. Compared with the initial operation of the original titania-based catalyst, the adiabatic conversion rate was increased by 17.10 percentage points, the adiabatic selectivity was increased by 31.54 percentage points, and the adiabatic catalyst showed higher activity and anti-peroxidation ability during the reaction process. Compared with before replacing the catalyst, the total conversion rate, selectivity and sulfur recovery rate of the sulfur recovery unit were increased to more than 95%, and the alkali consumption was reduced by 16 m3/d. Compared with the initial operation of titania-based catalyst, the total conversion rate, selectivity and sulfur recovery rate increased by 1-3 percentage points, and the alkali consumption was reduced by 11 m3/d. Conclusion After the adiabatic catalyst was replaced by the silica-based catalyst, the mass concentration of SO2 in the tail gas is significantly reduced, and it is stably maintained below 100 mg/m3, which has significant environmental benefits. |
| Key words: sulfur recovery direct selection oxidation desulfurization conversion rate selectivity silica-based catalysts |
