The main process flow of the first domestic single-series, large-scale and automatic methanol plant with natural gas as raw material is introduced. The mode of carbon supplement in the initial stage of construction is expounded, and then a series of optimization measures are taken for the hydrogen-carbon ratio according to the actual production situation, which proves the importance of the hydrogen-carbon ratio in methanol production and consumption, and puts forward a new method for adjusting the hydrogen-carbon ratio. Key words: H/C optimization of process carbon supplement.

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