关键词: 燃料气, 优化, 效益, 核算, 燃料气系统, 优化, 效益, 核算, 可行性

Abstract: This paper presented two optimization plans aiming at the solution of high flue gas emissions based on the existing conditions of flue gas exhaust in a coal chemical plant. The purpose was ultimately to reduce emissions，improve energy efficiency，and save operation cost. The material balance and the economic benefits of the two proposed plans were analyzed and compared. The results showed that plan No.1（modify the existing fuel gas pipe network，send the fuel gas line full of olefins and methanol to the Power plant，expand the hydrogen recovery capacity of PSA，make the gas volume of recovering reach 23778.4m3/h） was better than plan No.2（maintain the currently running state of PSA unit，build a tail gas recovery device for recovering CO and H2 from methanol purge gas，then the fuel gas system can achieve material balance），in terms of feasibility，low investment，more convenient for operation and maintenance.

Key words: fuel gas, optimization, calculation, benefit, fuel gas system, optimization, benefit, calculation, feasibility