HYDROGEN PRODUCTION SYSTEM USING IS PROCESS AND IODINE RECOVERY METHOD

• Main Authors: KASAHARA SEIJI, KUBO SHINJI, NOGUCHI HIROYOSHI, KON HAJIME, NAOI TOKIO
• Format: Patent
• Language: English; Japanese
• Published: 15.11.2018
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS

PROBLEM TO BE SOLVED: To provide a hydrogen production system capable of preventing crystallization and deposition of iodine in each device or a piping during treatment in a HI decomposition reaction process of a system that produces hydrogen with an IS process.SOLUTION: In a hydrogen production system in which hydrogen iodide (HI) obtained after a Bunsen reaction is vaporized, conveyed into a hydrogen iodide (HI) cracking unit through a regenerative heat exchanger, and after thermal decomposition into a mixed gas made of hydrogen (H) and iodine (I), once more conveyed into a HI-Irecovery separator via the regenerative heat exchanger, and in a hydrogen production system that uses an IS process that finally separates and recovers hydrogen, a preheater is provided in a front stage of the regenerative heat exchanger, such that the mixed gas may not be a temperature lower than an iodine depositing temperature in the inside of the regenerative heat exchanger, a temperature of a process fluid on a low temperature side that heat exchanges therewith is actively controlled.SELECTED DRAWING: Figure 4 【課題】ＩＳプロセスを用いて水素を製造するシステムのHI分解反応工程において、処理中に各機器や配管内でヨウ素が析出し沈着することを防止できる水素製造システムを提供すること。【解決手段】 ブンゼン反応後に得られるヨウ化水素（HI）を気化させた後、再生熱交換器を通してヨウ化水素（HI）分解器に送り込み、水素（H2）やヨウ素（I2）などから成る混合ガスに熱分解した後、再度前記再生熱交換器を介してHI-I2回収分離器に送り、最終的に水素を分離回収するＩＳプロセスを用いた水素製造システムにおいて、前記再生熱交換器の前段に予備加熱器を設け、前記再生熱交換器内部で前記混合ガスがヨウ素析出温度より低温にならないよう、これと熱交換する低温側プロセス流体の温度を能動的に制御している。【選択図】図４