通过对煤制天然气联产甲醇和乙二醇典型案例分析，研究煤制天然气联产化学品作为煤制天然气升级示范的技术优劣势。研究表明，通过产品结构优化和工艺系统集成等方式，工艺系统资源利用效率大幅提升。在消耗相同原料情况下，煤制天然气联产甲醇和乙二醇过程相比于煤制天然气过程产品产量增加64.8%。通过元素流分析发现，碳元素利用增加9.9万t，氢元素利用增加1.81万t，氧元素利用增加60.69万t。煤制天然气联产甲醇和乙二醇使更多的原料气转化为高附加价值的化学品，提升了项目的经济性，同时不同的产品结构为工艺系统集成提供了空间，煤制天然气联产化学品可作为煤制天然气产业升级示范重点关注的工艺路径。

By analyzing typical cases which methanol and ethylene glycol are co-produced in a coal to synthetic natural gas (SNG) process,the advantages and disadvantages of coal to SNG with co-production of chemicals route are studied.It is found through studies that the resource utilization efficiency is greatly raised through products mix optimization and process system integration.In general,the coal to SNG with co-production of methanol and ethylene glycol process produces 64.8% more products than the coal to SNG process in the premise of consuming same quantity of raw materials.It is found through analysis on element flow that the utilization rates of carbon,hydrogen and oxygen by using the co-production process increase by 99 000 tons,18 100 tons and 606 900 tons,respectively compared with that by pure coal to SNG process.The co-production process enables more feed gas to convert into high value-added chemicals,which improves the economy.Multiple products mix provides space for process system integration.Coal to SNG with polygeneration chemicals process can be referred to an important path for coal-to-SNG industry to upgrade.

刘阳(1989-),男,博士,研究方向为煤化工过程优化