用天然气制合成气代替ATR转化气优化乙炔尾气甲醇装置运行研究

四川维尼纶厂现有一套10万t/a的基于天然气蒸汽转化的甲醇合成装置和一套77万t/a的乙炔尾气甲醇合成装置。天然气蒸汽转化制备的合成气惰性气体含量低,氢含量高,而乙炔尾气甲醇装置ATR转化气惰性气体含量高。在深入分析两种合成气的特性的基础上,提出了以天然气制备的合成气替代乙炔尾气甲醇装置的ATR转化气,降低合成环路惰性气体含量、优化合成气气质、改善产品质量、提高甲醇产量的可工程实施的优化运行方案。

Operation optimization of acetylene off-gas-based methanol unit via using natural gas-based syngas instead of ATR reforming gas

There were a 100kt/a natural gas-based methanol unit and a 770kt/a acetylene off-gas-based methanol unit in Sichuan Vinylon Works.The syngas prepared by natural gas steam reforming had low inert gases content and high hydrogen content,and the inert gases content of acetylene off-gas was high.Based on the analysis of the characteristics of both syngases,a feasible operation optimization plan for the acetylene off-gas-based methanol unit was proposed,in which the natural gas-based syngas was used to substitute for the ATR reforming gas of the acetylene off-gas-based methanol unit to decrease inert gases content in the synthesis loop,improve the quality of syngas and methanol product and increase the output of methanol.