天然气非催化部分氧化制还原气的净化系统模拟

Simulation on purification process for making reduction gas by partial oxidation of nature gas without catalyst

利用Aspen Plus软件对天然气非催化部分氧化制还原气后采用的MDEA法脱除硫化氢和二氧化碳工艺过程进行模拟研究。考察了液气比、操作压力和MDEA溶液质量分数对还原气脱硫脱碳效果的影响。灵敏度分析结果表明,随着液气比的升高、吸收塔操作压力的升高、MDEA溶液质量分数的增大,塔顶出口的CO_2和H_2S的摩尔分数先呈线性规律减小后逐渐趋于变缓的趋势。灵敏度分析模拟给出了最佳操作参数,即吸收塔1、塔2液气比分别为12.6、42.6 kg/kg,吸收塔2操作压力为300 kPa,MDEA溶液质量分数为46%。

The Aspen Plus software is used to simulate the methyl diethanolamine（ MDEA） process for removing H2 S and CO2 from reduction gas that is made by non-catalytic partial oxidation of natural gas. The effects of liquid-gas ratio,operating pressure and the concentration of MDEA on desulfurization and decarburization efficiencies of reduction gas are investigated. The sensitivity analysis results indicate that the mole fractions of CO2 and H2 S at the top of absorption towers will decrease linearly at first and then tends gradually to slow down when liquid-gas ratio,operating pressure and concentration of MDEA increase. The sensitivity analysis results give the optimum operation parameters as follows： the ratios of liquid to gas for 1# and 2# absorption tower are 12. 6 kg·kg^（-1） and 42. 6 kg·kg^（-1）,respectively,the operation pressure for 2# absorption tower is 300 kPa and MDEA concentration is 46 wt%.