Mild Gasification of Steam-Conditioned Bituminous Coal in Fluidized Beds: Technical Note.

摘要

A detailed systems analysis of a commercial-scale mild gasification process has been performed. The process includes (1) a conceptual design of the process, (2) mass and energy balances that were calculated with the use of the Advanced System for Process Engineering (ASPEN) process simulator, and (3) a detailed economic assessment that includes several sensitivity studies. In this conceptual study, 1 million tons per year, dry basis, of Pittsburgh No. 8 coal are conditioned with steam at 700/degree/F for 5 minutes in a fluidized-bed and devolatilized at 1000/degree/F for 3 minutes in a second fluidized-bed. Volatiles are condensed and liquid condensate and gas are separated. Liquid production is 340,000 tons per year (approximately 1,870,000 barrels per year) based on an increased liquid yield due to steam conditioning of 37 weight percent of dry, ash-free coal (DAF). This assumed yield is based on bench-scale experimental results for steam-conditioned coal (Graff 1987). Gas produced in the process is internally consumed for char heating and steam generation. Net char production is 466,000 ton/yr. 27 refs., 3 figs., 3 tabs. (ERA citation 14:005747)