关键词: 煤炭直接液化, 优化, 氢气

Abstract: This article analyzed the hydrogen requirement in Shenhua direct coal liquefaction project (SDCLP) and presented efforts in reducing hydrogen usage. In SDCLP, two coal gasifiers were used to provide hydrogen required for direct coal liquefaction and downstream oil hydrogenation processes. After deploying a membrane system at the outlet of cold high pressure separator, the hydrogen concentration of recycle gas increased from 86.6% to 97.0%. Thus, the consumption of make-up hydrogen could be greatly decreased from 28.93t/h to 9.19t/h, as well as the recycle cup operation of the second reactor was satisfied. Pressure Swing Adsorption (PSA) facility was also used to recover hydrogen from the hydrogen-rich off-gas discharged from coal liquefaction, solvent hydro-stabilization and hydro-upgrading units. In order to further increase hydrogen utilization, a suggestion of recovering hydrogen in the PSA tail gas was proposed.

Key words: direct coal liquefaction, optimization, hydrogen