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In this study, the commercial chemical process simulator, PRO/II W V8.1.1, is implemented to perform the simulation of a coal gasification-based co-production system, of which the feedstock is kaltim prima coal from Indonesia, and the products are electricity and dimethyl ether (DME). There are five major blocks in the multi-product plant, i.e. air separation unit (ASU), gasification unit, gas clean-up unit, combined-cycle, and DME synthetic unit. ASU utilizes cryogenic air separation process, which provides oxygen with 95 mol% purity to the gasification unit and nitrogen to the combinedcycle. General Electric technologies are employed in the study, i.e. quench-type slurry-fed gasifier for the former and 7FB-series turboset for the latter. The clean-up unit includes dry solids removal, syngas scrubbing, sulfur compounds removal, and sulfur recovery processes, which are implemented to deliver clean syngas to further processes and elemental sulfur from H 2 S. The clean syngas is divided into two equal streams to generate electricity and produce DME, simultaneously. The results show that the gross and net electrical power outputs are 371.6 and 275.1 MW, respectively; furthermore, the yield of DME is 51.78 mt/h. In summary, the net efficiency of the coal gasification-based multi-product plant is 46.1% (HHV), which is higher than the counterpart of typical integrated gasification combined-cycle plants by over four percentage points.

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This study presents a system-level simulation model with the commercial chemical process simulator, Pro/II® V8.1.1, for poly-generation applications, based on gasification technology. The feedstock is coal and the products are electricity and methanol. There are five major blocks in the simulated polygeneration plant, i.e. air separation unit (ASU), gasification unit, gas clean-up unit, combined cycle, and methanol synthetic unit. The first four blocks can be combined for electricity generation, i.e. integrated gasification combined cycle (IGCC). The study performs two analyses of basic case and polygeneration. The basic case is the benchmark case which is verified with the reference data from United States Environment Protection Agency. The poly-generation case is based on the basic case model, and to simulate a feasible case with actual parameters in Taiwan. The simulated outcome shows that the power output is 262.35 MW and the methanol production is 1,768.8 ton per day. The gross and net efficiency (HHV) of the integrated gasification poly-generation case are 52.75% and 46.42%, respectively. The latter is higher than the counterpart of traditional IGCC plants by over 4% points. In conclusion, integrated gasification poly-generation process provides an alternative choice to reduce the dependence on fossil fuels, especially crude oil, in Taiwan.