成果報告書詳細
管理番号20150000000322
タイトル*平成26年度中間年報 水素利用等先導研究開発事業 低コスト水素製造システムの研究開発 高効率低コスト水素製造システムの研究開発
公開日2015/12/22
報告書年度2014 - 2014
委託先名日立造船株式会社
プロジェクト番号P14021
部署名新エネルギー部
和文要約
英文要約Title: Project for Cutting-edge R&D of Hydrogen Utilization, Etc. / R&D of Low-cost HPS / R&D of High-efficiency and Low-cost HPS (2014 to 2015)

(1) Development of high-efficiency and low-cost alkaline water electrolysis system
Increase of efficiency
We examined the operating parameters and electrolytic cell components in laboratory scale test and proved that optimization of the operating temperature and electrode form is effective in increase of efficiency. We achieved the initial electrolytic pressure of 1.8V or less at a current density of 0.6A/cm2 under the atmospheric pressure by using the optimized operating parameters and electrolytic cell structure.

Evaluation of durability
We conducted continuous test with constant current at a current density of 0.65A/cm2 in the laboratory scale test and confirmed that the electrolytic voltage after a lapse of 600 hours was 1.8V (at a current density of 0.6A/cm2). The continuous test results showed that the electrolytic voltage fluctuates with changes in conductivity of the circulating liquid, and we improved the system operating method to keep the circulating liquid concentration constant.

Scale-up
We completed the assembly of the 50Nm3/hr alkaline electrolysis system and produced a small working prototype of electrolytic cell having an electrode area of 2,500cm2 to perform the test run. As the result of the test run, we extracted problems related to scale-up of the system design and electrolytic cell design.

(2) Development of system combined with renewable energy
We examined the specifications for each device of the Hydrogen Production System (HPS) under the following examination conditions in consideration of the demand for electric power, wind velocity and operation of existing diesel generators on the remote island. Then, we set the power output to 100kW and the hydrogen storage capacity to 187m3 (at 15MPa), determined the specifications for the HPS components and completed the basic design of the verification equipment.
-Production of hydrogen with surplus power of two existing 245kW wind power generators
-Consideration of long-term energy shift (Surplus power generated in good wind conditions is utilized in summer.)
- Determination of hydrogen tank storage capacity to efficiently utilize the hydrogen produced by surplus power
The basic designs for the following three cases were implemented under these conditions.
Case 1: Production of hydrogen + storage of hydrogen + utilization of hydrogen (FC)
Case 2: Production of hydrogen + recovery of CO2 (from GE and DE exhaust gases etc.) + production of methane + storage of methane + utilization of methane (GE)
Case 3: Production of hydrogen + recovery of CO2 (woody biomass gasification) + production of methane + storage of methane + utilization of methane (GE)
The system in Case 1 produces hydrogen with surplus power, stores the hydrogen as it is in a tank and generates power by fuel cells. On the other hand, the systems in Cases 2 and 3 synthesize the hydrogen produced with surplus power with carbon dioxide to produce and store methane fuel and generate power by gas engines. As a carbon dioxide source, the system in Case 2 uses diesel engine and gas engine exhaust gases, and that in Case 3 uses gasified woody biomass. As the verification system structure, we will use the system in Case 2 which can reduce the installation space and cost.
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