Cogeneration of electricity and liquid carbon dioxide by combustion of methane-rich gas

摘要

Cogeneration of electricity and liquid carbon dioxide is conducted by combusting methane-rich gas to power a gas turbine and a steam turbine; each turbine drives an electric generator. Carbon dioxide is separated from the combustion products by an amine absorption system to which heat for releasing absorbed carbon dioxide is supplied by steam drawn from the steam turbine. Some of that steam is used to produce refrigeration with an ammonia absorption refrigeration unit. The refrigeration is applied to the separated carbon dioxide to liquefy it. Fractionation to yield purified liquid carbon dioxide is easily achieved and saleable refrigeration is another optional product of cogeneration.