ＬＮＧ冷熱利用による液化炭酸ガス，ドライアイスの製造

Abstract

Since 1969, Japanese power and gas companies have been importing LNG as a power generation fuel and a gas making feed stock. The amount of importing LNG have been increasing gradually, and 17 million tons of LNG was imported to Japan in 1981. This means that the cold potential of LNG which can be utilized, has also been increasing.From the viewpoint of energy saving, to utilize the cold potential of LNG has a significant meaning. The utilization of LNG cold is now realized in the form of air separation, frozen food ware house, carbon dioxide liquefaction and power generation in Japan. Annual saved energy by LNG cold utilization is equivalent to some 40, 000 kiloliters of crude oil. This report describes history of carbon dioxide liquefaction, merits of liquefaction plant using LNG cold compared with conventional ones, and introduction of liquefaction processes. There are three carbon dioxide liquefaction plants using LNG cold energy in Japan. Energy consumption of these plants for liquefing carbon dioxide is reduced to some 50% by using LNG cold.