Abstract
The coupling of an integrated gasification combined cycle (IGCC) electric power plant with a hydrogen-consuming chemical (methanol) plant can handle swings in electric power demand. Hydrogen gas from the combustion turbine and synthesis gas from the gasifier can be diverted to a methanol plant for the production of an easily stored, hydrogen-consuming liquid product. This paper extends previous work on dynamic studies of a gasifier and downstream units of an IGCC to explore the steady-state economic design, control, and successful turndown of the methanol plant. The plantwide control structure and interaction among units are also shown. The methanol plant is sized to reduce the power generation from an IGCC by 50%, producing a high-purity methanol stream of 99.5 mol %. Regulatory control structures are designed and play a significant role for the successful turndown of the methanol plant to 20% capacity. The exit temperature of the cooled tubular methanol reactor is controlled instead of a peak temperatur...
Published Version
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