Patent ID: 9334454
Filing Date: 2016-05-10
CPC Classification: C10L

Claim Text:
1. A method for producing a synthesis natural gas using a straw gas, comprising the steps of: (a) pressurizing, wherein the straw gas is conveyed to a compressor and pressurized to 1.0-2.0 Mpa, wherein components (V %) of the straw gas comprises 15.08% of CO, 30.97% of CO (b) heating, wherein the straw gas pressurized in step (a) is conveyed to a pre-heater and heated to 300-320° C.; (c) synthesizing methane, wherein the straw gas obtained in step (b) is conveyed to a converter containing carbon monoxide and hydrogen to react therewith in the presence of nickel-based catalyst, so as to result in conversion gas mixture with main components of methane, carbon dioxide, water and impurities; (d) cooling, wherein the converted gas mixture resulted in step (c) is conveyed to a condenser for cooling to 20-40° C., so as to result in cooled conversion gas mixture; (e) gas-liquid separating, wherein the cooled conversion gas mixture resulted in the step (d) is conveyed to a gas-liquid separator, so as to result in gas-liquid separated gases mixture; and (f) purifying, wherein the gas-liquid separated gases mixture processed by the gas-liquid separator in the step (e) is conveyed to an adsorption purifier for removing carbon dioxide, water, nitrogen, oxygen, carbon monoxide and impurities to obtain the synthesis natural gas with methane content of over 90%.