Flash Hydropyrolysis of Lignite and sub-Bituminous Coals to Both Liquid and Gaseous Hydrocarbon Products

摘要

Flash Hydropyrolysis (FHP) is a short residence time (1 to 10 sec) gas phase noncatalytic coal hydrogenation process in which coal is converted directly to liquid and gaseous hydrocarbon products. Pulverized coal is contacted with hydrogen at elevated pressure and heated at average rates of 20,000 to 30,000 exp 0 C/sec causing thermally-induced fractures in the polycyclic structure of the coal molecule. The free radicals formed readily add on hydrogen thus increasing the hydrogen to carbon ratio of 0.8 in the feed coal to approximately 1 to 4 depending upon whether liquid or gaseous hydrocarbons are formed. The products are then rapidly quenched to terminate the reaction and to prevent any decomposition or recombination. The purpose of this work is to provide data on the process chemistry of the reaction by studying the liquid and gaseous products formed as they vary with such operating parameters as temperature, pressure, and residence time. These results are also applied to a kinetic model and an economic evaluation of a large scale integrated coal conversion processing plant. (ERA citation 04:054055)