成果報告書詳細
管理番号20120000000369
タイトル*平成23年度中間年報 水素製造・輸送・貯蔵システム等技術開発 水素製造機器要素技術に関する研究開発 CO2膜分離法を用いた水素製造装置改質システムの開発
公開日2013/3/20
報告書年度2011 - 2011
委託先名株式会社ルネッサンス・エナジー・リサーチ、株式会社ミクニ
プロジェクト番号P08003
部署名新エネルギー部
和文要約和文要約等以下本編抜粋:
1. 研究開発の内容及び成果等
現在開発中の水素ステーション用改質システムでは、水蒸気改質により炭化水素を水素、COに改質し、さらにCO変成反応を用いてCOを水素に変換することにより水素を製造している。
その後、燃料電池自動車用の高純度水素を造る為、PSA(プレッシャー・スイング・アドソープション)により水素を精製している。しかし、これらの技術は基本的に大規模水素製造プロセスとして開発されたものであり、天然ガスや石油からオンサイトで水素を製造、供給する水素ステーションにおいては、システムの低コスト化、コンパクト化、高効率化が技術開発の課題となっている。
これら課題を解決するために、本プロジェクトでは、選択的、効率的にCO2の分離が可能なCO2選択透過膜と、高性能なCO変成触媒を組み合わせたCO2分離型メンブレンリアクターの開発を行っている。
英文要約Title: Development of Technologies for Hydrogen Production, Delivery and Storage Systems.
Development of Elemental Technologies for Hydrogen Production Components. Development of Advanced Reforming System for H2 Station Using CO2 Selective Membrane (FY2008-FY2012) FY2011 Annual Report

In this project, for the purpose of making hydrogen stations more efficient, compact and low in cost, we are carrying out the development of a membrane reactor, which combines CO2 selective membranes and CO shift catalysts.
As we reported, as a result of the past studies, we successfully developed novel CO2 selective membrane with excellent and stable performances exceeding our target values, i.e. CO2 permeance of 1x10^-4mol/(m^2skPa) and CO2/H2 selectivity of 100 at 160 degree Celsius.
In this fiscal year, we have been focusing on evaluation of membrane performance in the actual operation conditions including start/stop operations. So far, evaluations of membrane performance and membrane module tests have been mainly made in the low pressure region. On the other hand, in the practical aplication, it is most favorable to utilize city gas with middle pressure( 0.5 ? 0.8 MPa) as raw material, therefore, we have made evaluation of membrane performance under such a middle pressure situation and have tried to improve membrane production process coping with the middle pressure. In addition, we have made trial designe, trial production and performance evaluation of the membrane module usable in middle pressure. Concretely, we studied structure of cylinder-type membrane module based on the inner-coated tube-type membrane, which is superior to the existing plate-type stack in terms of pressure tightness. And we designed and made proto-tipe of 1m^2 module consisting of 36 tube-type membranes. As a result of the testoperation , we confirmed the equal level performances of 1m^2 module (36 tube-type membranes) as the single tube-type membrane.
As for the development of CO shift catalysts, in this fiscal year, in the study of effects from the scale up of combined high-performance CO shift catalysts, we designed and made a proto-type of heat exchange-type isothermal CO shift reactor with H2 production capacity of 10m^3/Hr. As a result from the test operation of the proto-type reactor, we achieved favorable performances only using catalysts, more than 99% of CO conversion, as we found in the laboratory.
As for the study of total system of hydrogen station, since last year, we have continued to make process study of steam reformer whose parameters are efficiency of reformer, gas composition of reformer outlet, PSA design, required amounts of purging gas, H2 recovery efficiency and so on. In addition, we studied recent developments of PSA adsorption agents and updated effects on required amounts of PSA adsorption agents by gas composition of reformer outlet. Moreover, we studied effects of process improvements by PSA adsorption agents, which is newly developed and accelerate CO adsorption. By adopting such agents, we found that required amounts of PSA adsorption agents decreased, and in addition we could expect large synergistic effects by optimizing operating conditions of membrane reactor.

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