ISプロセスのための直接接触式硫酸濃縮における物質移動係数の測定法

Measurement of mass transfer coefficient in direct contact sulfuric acid concentration for IS process

杉山 功晃*; 野口 弘喜  ; 竹上 弘彰 ; 小貫 薫; 金子 暁子*; 阿部 豊*

Sugiyama, Katsuteru*; Noguchi, Hiroki; Takegami, Hiroaki; Onuki, Kaoru; Kaneko, Akiko*; Abe, Yutaka*

高温ガス炉の有力な熱利用系である熱化学水素製造法ISプロセスにおける硫酸分解工程の高効率化及び簡素化が期待できる直接接触式硫酸濃縮器の設計に必要な物質移動係数の測定法について、濡れ壁塔を用いた共沸硫酸-不活性ガス系における物質移動係数測定を提案するとともに、測定に必要な安定した気液界面の形成に関する検討結果を報告する。

The Japan Atomic Energy Agency has been conducting R&D on thermo-chemical IS process, which is one of most attractive water-splitting hydrogen production methods using nuclear heat of a high temperature gas-cooled reactor. The present study concerns with development of IS process equipment utilizing direct contact heat exchanger (DCHX). The application of DCHX to the sulfuric acid decomposition step of IS process has been proposed such that the decomposed gas contacts with the sulfuric acid solution supplied from the Bunsen reaction step. The concept is very attractive in terms of the development of compact and efficient sulfuric acid concentrator. However, little is known on the behavior of sulfuric acid in the DCHX, which is required for the equipment design. Therefore, we considered an experimental acquisition of essential design parameter of the DCHX, the gas-phase mass transfer coefficient.