|タイトル||*平成23年度中間年報 「新エネルギーベンチャー技術革新事業 新エネルギーベンチャー技術革新事業（燃料電池・蓄電池） 安全性と耐久性に優れた燃料電池用水素循環ブロワの技術開発」|
|報告書年度||2011 - 2011|
|英文要約||New Energy Technology Research Development/ New Energy Venture Business Technology Innovation Program (Fuel Cells and Batteries)/ Development of safe and reliable hydrogen recycling blower for fuel cell system (FY2011-FY2012) FY2011 Annual report
The hydrogen recirculation blower (hereinafter HRB) that is the objective of this project is used to pressurize remaining hydrogen fuel from the power generation process in a fuel cell and to send it back to the upstream of the fuel cell. Since HRB carries hydrogen fuel, it requires explosion proof, higher reliability and safety. No commercial blower meeting such requirements is available. This has been a bottleneck of application of fuel cell system. We determined to utilize electromagnetic diaphragm system as HRB. We have studied for improvement of the reliability and safety of HRB.
4) Study on durability of HRB and degradation of diaphragm rubber by fuel hydrogen gas
We have confirmed more than 4,000-hour-durability of first prototype HRB by dry hydrogen. Fuel gas in the fuel cell system consists of wet mixed gas of hydrogen and nitrogen. In order to clarify the effect of the fuel hydrogen gas on the durability of HRB, we have developed the wet mixed gas recycling system and conducted the recycling test of second prototype of HRB. The recycling system equipped with on-line wetter of the recycling mixed gas at upstream of HRB and on-line dryer of wet recycled gas at downstream of HRB. At this stage, we confirmed 2,500-hour durability of the prototype HRB by the recycling test. Continuous operation of HRB for 3,300 hours, which is the final target of this project, will be achieved until the end of the period of this project.
The tensile-tested of rubber for diaphragm after exposure to wet mixed gas at elevated temperatures were performed as aging test. Rubber aged in wet mixed gas environment shows higher tensile strength and extensibility than that aged in air because of inhibition of rubber oxidation in the anti- oxidizing atmosphere. According to these results, HRB shows higher durability than the air blower.
5) Development of prototype of HRB for field test
We determined the suitable design of HRB prototype and selected the materials used for the components of HRB according to the results of dry hydrogen gas recycling test for the first trial prototype of HRB. We have manufactured 14 sets of prototype HRB for evaluation and field test.
Resin materials used for the components of HRB can be affected by the wet mixed gas. Avoiding the hydrolysis of the materials, we selected poly(phenylene sulfide) for the material of the component based on the aging test in wet mixed gas.
Neodymium magnet, which is used as a core of electromagnetic movement of HRB, is protected from hydrogen embrittlement by nickel plating layer on the surface. In order to improve the durability of protect layer of the magnet, we tried to make hydrogen barrier layers on the surface of the magnet. Film coat is suitable method for making barrier layer on the surface of the magnet.
6) Field test
We supplied 6 HRB's to the fuel cell system manufacturing industries for the test of fuel gas recycling blower in the fuel cell system as the auxiliary power units of mobile phone station and electric power train system of industrial load carrier vehicles or forklift trucks. We expect that evaluation results of prototype HRB will give us important information for improvement of HRB design and performance.