Techno‐Economic Analysis of a Coal Staged Conversion Polygeneration System for Power and Chemicals Production.

Steady‐state process simulation and techno‐economic analysis of a pyrolysis‐based coal staged conversion polygeneration (CSCP) plant, integrated with wastewater biochemical treatment after phenol‐ammonia recovery, are studied using Aspen Plus software. Appropriate models for the proposed system are set up in detail. Furthermore, by optimization of a methanation unit, a conventional supercritical circulating fluidized bed (SCCFB) power plant with the same capacity is chosen for comparison. Simulation results reveal that system energy and exergy efficiency of the CSCP system can reach much higher values than those of a conventional SCCFB power plant. In conclusion, a CSCP plant will have practical and economic advantages in the near future. A coal staged conversion polygeneration plant for the coproduction of coal gas, tar, and electricity power, integrated with wastewater biochemical treatment after phenol‐ammonia recovery, is proposed and simulated. Appropriate models for the proposed system are assessed. Such kind of plant exhibits practical and economic advantages, with excellent values of system energy and exergy efficiency. [ABSTRACT FROM AUTHOR]