Energy and environmental research emphasizing low-rank coal: Task 3.9 catalytic tar cracking

摘要: Tar produced in the gasification of coal is deleterious to operation downstream equipment, including fuel cells, gas turbines, hot-gas stream cleanup filters, and pressure-swing absorption systems. Catalytic cracking tars smaller hydrocarbons can be an effective means removing these from streams and, process, generating useful products, such as methane gas, which crucial molten carbonate cells. Aerosol are not readily removed by conventional a consequence, often end up plugging filters or fouling sorbents. molecular moieties C{sub 10} would prevent problems commonly attributed tars. As example, moving Bourdon fixed-bed gasifier, virtue its efficient countercurrent heat exchange widespread commercial use, may offer lowest-cost integrated combined-cycle (IGCC) system if tar generation wastewater contamination minimized. We evaluate potential selected catalysts minimize accumulation maximize char conversion liquid and/or gaseous products. Owing for production extremely toxic nickel carbonyl care must exercised use NISMM catalyst at high temperatures reducing atmospheres those gasification. observed fifty percent more during steam Beulah lignite 400{degrees}-800+{degrees}C when cracked either dolomite zeolite maintained temperature 50{degrees}C-100{degrees}C below that reactor.