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.

Method for preparing synthetic natural gas from coal carbonization gas as raw material

Abstract: The invention discloses a method for preparing synthetic natural gas from coal carbonization gas as raw material. The method comprises the following steps of: (1) performing dry distillation pyrolysis reaction on coal raw material in a dry distillation furnace by burning hot waste gases, to produce coal tar, coal carbonization gas and semi-coke; (2) spraying water to the gaseous mixture composed of coal tar and coal carbonization gas produced in the step (1) to separate the coal carbonization gas from the coal tar; and (3) maintaining the volume ratio of carbon monoxide to hydrogen gas in the coal carbonization gas to 1:(2 to 5), removing acidic gases, allowing reactions to occur between carbon monoxide and hydrogen gas in the coal carbonization gas to produce synthetic natural gas, and liquefying at a low temperature to obtain the final product of synthetic natural gas. The method produces synthetic natural gas from coal carbonization gas as raw material, adopts low-temperature separation and purification techniques and liquefied natural gas production techniques, overcomes the difficulty of preparing synthetic natural gas from coal carbonization gas in case of no pipeline transportation, and is significant in application value.

Methanation Synthesis Technology in Process of Coal-to-Synthetic Natural Gas

Abstract: Key technology of the coal to natural gas is based on the methanation synthesis technology.Author has introduced the situation of the methanation synthesis technology at home and abroad,has separately discussed the technical features,catalyst activity and productive application effect of the three kinds of methanation processes of Davy,TREMPTM and Lurgi.

Status of Underground Coal Gasification

Abstract: Underground coal gasification appears to be one of the most attractive routes for synfuels from coal because the process can produce methanol and substitute natural gas at prices competitive with existing energy sources. The technical feasibility of underground coal gasification has been well established by small scale field tests. Cost estimates based on the resultant data are favorable. The environmental effects associated with the technology appear to be acceptable. Successful commercialization of the process would probably triple the proven reserves of U.S. coal, which would be sufficient to last for hundreds of years. At this stage of development, underground coal gasification is a high risk technology and will remain so until large scale field tests are successfully carried out. These tests are recommended by the Gas Research Institute and by the American Institute of Chemical Engineers. A seven year program costing about $200 million would permit initial commercial production in ten years.

Process for synthesizing natural gas by performing methanation on coke oven gas

Abstract: The invention relates to a process for synthesizing natural gas by performing methanation on coke oven gas. The process comprises the following steps of: dispersing a fresh methanation catalyst into an inert liquid-phase medium and putting the mixture into a slurry bed methanation reactor for reducing; performing a methanation reaction on the reduced coke oven gas, introducing tail gas into a gas-liquid separator I, discharging a slurry liquid-phase component in the tail gas and the catalyst from the bottom of the gas-liquid separator I and exhausting a gas phase in the tail gas from the top of the gas-liquid separator I; introducing a part of catalyst-containing inert liquid-phase media into a gas-liquid separator II, exhausting a gas phase from the top of the gas-liquid separator II, combining the gas phase with the gas phase exhausted from the top of the gas-liquid separator I, cooling and performing pressure swing adsorption so as to obtain H2 and synthetic natural gas; and discharging a methanation catalyst-containing inert liquid-phase medium from the bottom, combining the methanation catalyst-containing inert liquid-phase medium with the slurry liquid-phase component and the catalyst which are discharged from the bottom of the gas-liquid separator I, filtering a large-particle catalyst of less than 300 meshes out, separating a fine catalyst of more than 300 meshes from the inert liquid-phase medium and discharging, mixing the separated inert liquid-phase medium and the large-particle catalyst, exchanging heat between the mixture and raw material gas, cooling, and introducing the mixture into the slurry bed methanation reactor together with the methanation catalyst which is newly dispersed into the inert liquid-phase medium for the methanation reaction. The process has the advantages that: the process has low energy consumption and small equipment investment, is easy to operate and can replace the catalyst on line.