关键词: 煤焦油加工项目, 氢气系统, 新氢管网压力, 富氢排放气体, 煤制氢系统, 集中供应新氢

Abstract: A coal tar processing project with slurry-bed hydrogenation unit as the leader adopts the full hydrogenation routing. In order to reduce hydrogen loss and energy consumption of hydrogen system, the design of hydrogen system in the whole plant is optimized. Such as setting reasonable operation pressure of refinery hydrogen network, recovering hydrogen from hydrogen-rich gas discharged by hydrogenation units, optimizing hydrogen purification scheme of the coal to hydrogen production system, and centralized supply of high-pressure new hydrogen, et al. Based on the coal tar processing capacity of 1.5 MM TPY, about 77 600 dam³ of hydrogen can be recovered from the hydrogen-rich gas discharged by hydrogenation units every year, and 8 000~16 000 dam³ of hydrogen can be multi recovered from the coal to hydrogen system. At same time, the methane in the coal to hydrogen production system can be recovered to produce LNG. The optimized design scheme can not only reduce the project investment, reduce the operation cost of the unit and improve economic benefits, but also improve the stability and reliability of unit operation.

Key words: coal tar processing project, hydrogen system, pressure of new hydrogen network, hydrogen rich emission gas, coal to hydrogen production system, centralized new hydrogen supply