In this paper,taking an annual output of 1 × 109 m3 coal to substitute natural gas (SNG) as an example,Shell coal gasification technology was used to produce synthesis gas. The equipment investment of air separation system(ASU),water gas shift system(WGS),wind power plant(WP)and electrolyzed water system(EWS)was compared between traditional coal-to-SNG and wind/coal SNG. The oxygen consumption,water steam consumption,electricity consumption and CO2 emission were also analyzed. Results show that although the investment of WP and EWS replacing the ASU and WGS is huge,its average annual operating cost(equip-ment investment,raw materials,power consumption)is lower,and CO2 emission is only 1.3%of the traditional coal-to-SNG technology. This paper provides a reference for the development of coal-to-SNG industry.%本文以年产1×109 m3煤制天然气工艺为例，采用Shell干粉气化技术，比较了传统煤制天然气工艺和风电/煤制天然气耦合情况下，工艺过程中（从煤气化到水煤气变换）的设备投资、运行费用以及CO2排放特性，结果表明，尽管风电电解水系统完全取代空分系统和水煤气变换系统设备投资巨大，但是其年平均运行费用（设备折旧、原料、电耗）却最低，CO2排放量为传统煤制天然气工艺的1.3%，为煤制天然气产业发展提供一个参考。
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