Production of Substitute Natural Gas from Coal

Andrew Lucero

关键词: CARBON;    CHARS;    COAL;    COMBUSTION;    FUEL GAS;    GASIFICATION;    METHANATION;    NATURAL GAS;    OXYGEN PLANTS;    PROCESS HEAT;    PROCESSING;    PRODUCTION;    PYROLYSIS;    RESEARCH PROGRAMS;    VOLATILE MATTER;   

DOI  :  10.2172/993826
RP-ID  :  None
PID  :  OSTI ID: 993826
Others  :  TRN: US201101%%232

美国|英语

来源: SciTech Connect

【 摘 要 】

The goal of this research program was to develop and demonstrate a novel gasification technology to produce substitute natural gas (SNG) from coal. The technology relies on a continuous sequential processing method that differs substantially from the historic methanation or hydro-gasification processing technologies. The thermo-chemistry relies on all the same reactions, but the processing sequences are different. The proposed concept is appropriate for western sub-bituminous coals, which tend to be composed of about half fixed carbon and about half volatile matter (dry ash-free basis). In the most general terms the process requires four steps (1) separating the fixed carbon from the volatile matter (pyrolysis); (2) converting the volatile fraction into syngas (reforming); (3) reacting the syngas with heated carbon to make methane-rich fuel gas (methanation and hydro-gasification); and (4) generating process heat by combusting residual char (combustion). A key feature of this technology is that no oxygen plant is needed for char combustion.