天然气中有机硫固定床转化催化剂的研究

针对川东北高含硫气田开发中的高浓度有机硫问题，利用多元金属络合固定床转化催化剂制备技术，研究开发了天然气中气相固定床羰基硫（COS）水解催化剂，实验考察了催化剂在不同温度、空速、气体组成下的水解转化率影响，根据研究结果推荐了天然气中COS水解催化剂的使用条件。以川东北高含硫气田胺液吸收塔出口湿净化气为基础，当COS质量浓度为200～300mg/m~3时，考察了催化剂连续运行200h的COS水解性能稳定性。结果表明，COS水解率大于97%，反应器出口COS质量浓度小于10mg/m~3。天然气中气相固定床催化水解技术和配套水解催化剂可用于解决川东北高含硫气田以COS为主的有机硫脱除处理，使商品天然气达到GB 17820-2018《天然气》中总硫质量浓度小于20mg/m~3的要求。

Study on fixed bed conversion catalyst for organic sulfur in natural gas

In view of the problem of high concentration organic sulfur occurring in the development of northeastern Sichuan high sulfur gas field, a gas-phase fixed bed catalyst for the hydrolysis of carbonyl sulfide in natural gas was studied and developed by using the preparation technology of multi-element metal complex fixed catalyst. The factors influencing the hydrolysis conversion rate of catalyst under different temperature, space velocity and gas composition were investigated experimentally. According to the research results, the application conditions of hydrolysis catalyst for carbonyl sulfide in natural gas were recommended. Based on the wet purified gas at the outlet of amine liquid absorber in northeastern Sichuan high sulfur gas field, when the mass concentration of carbonyl sulfur was 200-300 mg/m³, the catalyst stability of carbonyl sulfide hydrolysis with continuous operation for 200 h was investigated. The results showed that the hydrolysis rate was greater than 97%, and the mass concentration of carbonyl sulfide at the reactor outlet was less than 10 mg/m³. Gas phase fixed bed catalytic hydrolysis technology and matching hydrolysis catalyst in natural gas could be used to solve the removal of organic sulfur dominated by carbonyl sulfide in northeastern Sichuan high sulfur gas field. The total sulfur mass concentration in commercial natural gas was less than 20 mg/m³ which met the requirement of GB 17820-2018 Natural Gas.