Substitute natural gas

About: Substitute natural gas is a research topic. Over the lifetime, 1216 publications have been published within this topic receiving 23604 citations. The topic is also known as: synthetic natural gas.

Biothermal conversion of biomass and wastes to methane

Abstract: This paper describes the BIOTHERMGAS process for conversion of biomass and wastes to substitute natural gas (SNG) and/or medium-Btu gas. This process combines biological and thermochemical unit operations into a scheme that can efficiently convert the full spectrum of biomass or waste feedstocks (regardless of moisture and nutrient contents) to methane or other fuel products with minimum process residues. The BIOTHERMGAS process employs biogasification followed by thermochemical gasification of dewatered refractory digester residues. Nitrogen and other inorganic nutrients are recycled from the thermal process effluent to the biogasification unit. The product gas from the thermochemical gasifier can be converted to methane either by catalytic methanation or by biomethanation. The waste heat from thermal product gases is used to supply the heat requirement of the bioconversion component. The preliminary systems analyses were conducted on five applications of the BIOTHERMGAS process: three using biomass (Bermuda grass) and two using municipal wastes as feedstocks. Results indicate that this process is technically superior to either biological or thermochemical processes. The results of preliminary economic analyses and laboratory studies also show this process to be economically and technically feasible.

Process for producing combustible gases

Abstract: A process for producing a substitute natural gas from methanol, especially seaborne methanol liable to be contaminated with chloride, comprises catalytically reacting methanol vapor in a decomposition stage at an outlet temperature above 550° C, cooling the resulting gas by indirect heat exchange, preferably with water, to 250°-350° C, methanating the cooled gas with an outlet temperature of 500°-650° C, cooling the methanated gas by indirect heat exchange, preferably with methanol, and methanating the resulting gas in at least one further methanation stage. By avoiding the injection of liquid methanol, as had been previously proposed, for cooling the hot gas, the poisoning of catalysts by impurities such as chloride does not take place.

Gas processing handbook

Abstract: Basic processes for the gas processing industry are reviewed, plus those of more particular interest. The process descriptions are of dehydration, sweetening, recovery, sulfur recovery, tail gas cleanup, synthetic natural gas (liquid and solid feed), low-btu gas, hydrogen, and liquefied natural gas. In each description, there is appropriate information on applications, charge/feed, product, process steps, operating conditions, economics, present commercial installations, references and licensors, and a flow diagram. 48 references.