Abstract:

The industrial exhaust gas from some units in coal gasification to methanol process has high CO and H₂ contents. Coal chemical enterprises can use such exhaust gas as fuel gas or extract H₂ as raw material for downstream units. By analyzing the composition of exhaust gas from methanol plants in coal chemical enterprises, this paper proposes three different exhaust gas utilization schemes and flow charts, and calculates the material balance and cost structure of these schemes. With a detailed comparison of the product output changes and economic efficiency of different schemes, the comprehensive utilization paths of heat energy, CO and H₂ components in the exhaust gas under different conditions are analyzed. The scheme of adjusting the gas phase distribution can recycle the industrial exhaust gas as fuel gas without adding new units and increase the production of H₂, achieving good economic benefits.