Tham khảo tài liệu 'natural gas part 4', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 112 Natural Gas added to the second reactor in order to maintain the temperature below 750 C. On the basis of this scheme no large scale plant have been built Kopyscinski et al. 2010 . About fluidised bed methanation several projects have been set forth. In the first project started in 1952 by the United States Department of the Interior one fixed bed and two different fluidised bed methanation reactors were developed which were operated in total for more than 1000h. About this project no data are available after 1956 Kopyscinski et al. 2010 . A second project the Bi-Gas project was initiated in 1963 by Bituminous Coal Research Inc. USA for producing SNG from coal via gasification in a entrained flow gasifier. The methanation reactor developed within this project is a gas-solid fluidised bed reactor including a second feed inlet in the middle of the reactor and two in-tube heat exchanger. Experimental tests for about 2200h were done obtaining conversion of CO between 70 and 95 . After the last publication in 1979 no more reports on the Bi-Gas project have been found in the literature Kopyscinski et al. 2010 . Fig. 5. Scheme of the ICI high temperature process adapted from Kopyscinski et al. 2010 Finally between 1975 and 1986 the Thyssengas GmbH and University of Karlsruhe Germany focused on a fluidised bed methanation reactor the Conflux process described in section . A pilot plant reactor was built between 1977 and 1981 and later in 1981 a precommercial plant was erected with a production capacity of 2000 m3SNG h. There have been other projects about SNG production from coal developing different configurations from fixed and fluidised bed reactor for the methanator. For example the Synthane project developed by the Pittsburg Energy Technology Center USA the catalytic coal gasification by the Exxon Research and Engineering Company USA and the liquid phase methanation proposed by Chem System Inc. USA . The first and the third project were terminated in 1980-1981.
