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Introduction of loop operating system to improve the stability of continuous hydrogen production for the thermochemical water-splitting iodine-sulfur process

熱化学水素製造法ISプロセスによる連続運転安定化のためのループ運転システムの導入

田中 伸幸 ; 竹上 弘彰 ; 野口 弘喜 ; 上地 優; Myagmarjav, O. ; 久保 真治 

Tanaka, Nobuyuki; Takegami, Hiroaki; Noguchi, Hiroki; Kamiji, Yu; Myagmarjav, O.; Kubo, Shinji

熱化学水素製造法ISプロセスでは、配管閉塞などを回避し、水素製造を安定的に運転するため、各反応器における組成変動を抑制することが求められる。従来の運転方法は、全ての反応器を同時に接続するため、安定的に連動させて運転を行うことが困難であった。本報では、それを解決するため、反応工程別に閉ループを形成することで、各工程を個別に安定化させるループ運転を行った後、連続運転に移行する新たな運転方法を提示した。新たなループ構成に対して、フローシート解析を行い、物質収支が矛盾なく閉ループを構成していることを示し、加えて、ループ運転から連続運転に滞りなく移行でき、水素製造を達成できることを明らかにした。

The thermochemical water-splitting iodine-sulfur (IS) process enables producing hydrogen. In a previous operation procedure, after the components of the unit operations were individually started, they were connected at the same time. However, it was challenging to stably interconnect the components. This study introduces a new loop operation, subdividing the process configuration into four sections before transferring the continuous operation. The proposed loop operation was validated analyzing the material and heat balances of each section. The calculated results showed that the material balances of respective loop sections were closed. The loop operation mode would transfer to the continuous operation by connect all sections. Regarding the switching of operation modes, the material and heat balance showed no or little difference, indicating that two operation modes could only be changed by switching the pipelines. Consequently, the loop sections could be individually operated to stabilize the IS process system, and the loop operation could be smoothly transferred to the continuous operation.

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