Topic
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.
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Patent•
15 Apr 2015
TL;DR: In this paper, a new technology for preparing natural gas through coke-oven gas methanation is presented, which can be used for preparing high-methane-content synthetic natural gas, is low in energy consumption, is free of circulating compressor and less in equipment investment.
Abstract: The invention discloses a new technology for preparing natural gas through coke-oven gas methanation. The technology includes following steps: (1) performing desulfuration to coke-oven gas; (2) performing a methanation reaction in a three-stage adiabatic reactor, wherein hydrogen, carbon monoxide and carbon dioxide in the coke-oven gas are reacted to generate methane through a carbon compensation method at the inlet of the second stage of the methanation reactor; and (3) performing Condensation separation to obtain the natural gas with the content of methane being higher than 95%. The new technology can be used for prepare high-methane-content synthetic natural gas, is low in energy consumption, is free of circulating compressor and is less in equipment investment.
2 citations
Patent•
21 Dec 2006
TL;DR: A hydrogen/oxygen blend substitute gas is provided to supply a brown gas by mixing hydrogen and oxygen with the 2:1 ratio, thereby enhancing the use efficiency as the regeneration energy as mentioned in this paper.
Abstract: A hydrogen/oxygen blend substitute gas is provided to supply a brown gas by mixing hydrogen and oxygen with the 2:1 ratio, thereby enhancing the use efficiency as the regeneration energy. The brown gas of 1-99% is mixed with LNG(Liquefied Natural Gas) and SNG(Substitute Natural Gas) as the existing fossil fuels. The substitute gas mixed with the brown gas is used for the city gas, the industrial gas fuel and a gas engine, a gas turbine and the steam supply and power generation. The substitute gas has the rapid combustion property and the wide combustion range due to the wide inflammable limitation so that the harmful air pollution materials are reduced.
2 citations
TL;DR: In this paper, the basic trends in the refining of natural gas into alternative fuels are discussed, and a discussion of the main challenges involved in this process is discussed, as well as some possible solutions.
Abstract: Basic trends in the refining of natural gas into alternative fuels are discussed.
2 citations
Patent•
25 Feb 2016
TL;DR: In this article, the authors described a process for producing substitute natural gas comprising the steps of: feeding a first synthesis gas feed stream comprising hydrogen, methane, carbon monoxide and/or carbon dioxide in parallel to two or more bulk methanators in a first-bulk methanation zone comprising a first and a final-bump methanator.
Abstract: A process is described for producing a substitute natural gas comprising the steps of: feeding a first synthesis gas feed stream comprising hydrogen, methane, carbon monoxide and/or carbon dioxide in parallel to two or more bulk methanators in a first bulk methanation zone comprising a first bulk methanator and a final bulk methanator, feeding a second synthesis gas feed stream comprising hydrogen, carbon monoxide and/or carbon dioxide to one or more bulk methanators in a second bulk methanation zone comprising a first bulk methanator, each bulk methanator containing a methanation catalyst such that the feed streams are at least partially methanated, dividing the methanated gas stream recovered from the final bulk methanator in the first bulk methanation zone into a first portion and a second portion, recirculating the first portion in a recirculation loop to the first bulk methanator of the first bulk methanation zone to dilute the first synthesis gas feed stream fed to said first bulk methanator, and feeding the second portion to the first bulk methanator of the second bulk methanation zone to dilute the second synthesis gas feed stream fed to said first bulk methanator, wherein the feed pressure of the second synthesis gas feed stream is lower than the feed pressure of the first synthesis gas feed stream and the difference in pressure between the first and second feed streams is at least the pressure drop through the first bulk methanation zone.
2 citations
31 Dec 2015
TL;DR: In this paper, an 11-liter heavy duty compressed natural gas(CNG) engine was employed in order to examine the combustion and emission characteristics of synthetic natural gas (SNG) acquired from coal.
Abstract: Synthetic natural gas(SNG), acquired from coal, is regarded as an alternative to natural gas since a rise in natural gas due to high oil price can be coped with it. In the present study, 11-liter heavy duty compressed natural gas(CNG) engine was employed in order to examine the combustion and emission characteristics of SNG. The simulated SNG, made up 90.95% of methane, 6.05% propane and 3% hydrogen was used in the experiment. Power output, thermal efficiency, combustion stability and emission characteristics were compared to those with CNG at the same engine operating conditions. Knocking phenomenon was also analyzed at 1260 rpm, full load condition. Combustion with SNG was more stable than CNG. Nitrogen oxides emissions increased while Carbon dioxides emissions decreased. Anti-knocking characteristics were improved with SNG.
2 citations