38.ハイパーコール製造溶剤脱灰プロセスの開発(1) : プロセスアウトラインの構築

抄録

A high efficiency coal utilization system has been developing to reduce the CO_2 emission from the coal-fired power generation. It is named HyperCoal project. HyperCoal is an ash-free and alkali-free coal (ash<200PPM, Na+K<0.5PPM), which is expected to be directly fired in the high efficiency gas turbine (1350℃ class) generation system. Solvent de-ashing technology is applied to produce the ash free coal. Coal is dissolved into the two rings aromatic solvent (1-methylnaphthalene), and the insoluble residue is removed by the gravity settling and filtration. This paper reports the outline of the solvent de-ashing process. Operation conditions and vessel sizes were optimized by the results of fundamental studies. As a result of a simple and rough estimation, there is a possibility that the producing cost of HyperCoal will be restrained in less than 10 dollars per a ton.