| 摘要 |
A method and apparatus for producing substitute natural gas are disclosed as including a plasma reactor (PR) which has arc discharge electrodes and a large number of minute arc passages (35) formed in solid carbon materials filled in the plasma reactor. Feed water is converted into steam in steam generating zone (34A) of the plasma reactor and the steam is fed through the minute arc passages in which steam reacts the solid carbon materials in the presence of arc plasmas to produce synthesis gas. The synthesis gas is supplied to a methanation reactor (MR) which converts the synthesis gas into substitute natural gas. The arc discharge electrodes may be supplied with controlled electric power such that a H2/CO ratio is maintained at a fixed value. The substitute natural gas may be cooled to separate condensed water, which is recycled to the plasma reactor for production of the steam therein.
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