成果報告書詳細
管理番号20160000000168
タイトル*平成27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 アルカリ水電解水素製造システムの研究開発
公開日2016/12/23
報告書年度2015 - 2015
委託先名旭化成株式会社
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:Advancement of Hydrogen Technologies and Utilization Project/Low Cost Hydrogen Production Research and Development/Low-cost Alkaline-water electrolysis process (FY2014-2017) FY2015 Annual Report

A) Effect of fluctuated electric power to the electrolyzer
Using lab-electrolyzer, power-supply fluctuation influence was examined. Examination conditions were as follows.
Frequency period: 30second and 1,200second, amplitude of the current: 10% - 100%, 1,000Hrs continuous operations.
Results: No influences were detected.

B) Middle-size electrolyzer
Using Middle-size electrolyzer (Active area 0.25m2/cell, production rate 10Nm3/hr-H2), long term operation tests has been conducted. Main test conditions were as follows.
・Max current density: 10kA/m2-active area,
・The act of changing the amplitude / frequency of current: the real windmill generation pattern(Include current zero condition).
・Operating period: From March, 2015 to February, 2016
Results: No change of the electrolyzer performance (<1.80V @ 6kA/m2)was observed after the operating period.

C) Large-size electrolyzer
Production and setting of the large-size electrolyzer (Active area 2.7m2/cell, production rate 25Nm3/hr-H2) was completed. The initial evaluation of the electrolyzer was carried out. The result was good that electrolysis voltage was <1.80V @ 6kA/m2.
Results: After about 2,000Hrs continuous operation (including fluctuated power operation), it kept <1.80V electrolysis voltage @ 6kA/m2-active area.

D) DC power supply equipment development
The economically optimal sharing method of the generated power to the electric power system and the electrolytic apparatus was studied. The structure of the controller hardware and the control algorithm (e.g. sharing algorithm and calculation resolution) were verified, and a good prospect on this structure has been obtained. For the present DC power supply, the main factor of the low efficiency is low voltage of its input and output. The efficiency was estimated when its input and output voltage become high. As a result, it was found the efficiency can be raised by 4.3%. In addition, the efficiency can be raised by 2% more, eliminating the input transformer and diode rectifier by feeding the DC power from the DC link of the wind turbine converter to the input of the power supply.

E) Cooperative control method development
The simulation based analysis was carried out using cooperative control between wind turbines and a large water electrolyzer. As a result, the developed cooperative method (dynamic offset control) showed best performance in terms of grid stability and economic efficiency. In the case the hydrogen price is set at 30 yen/Nm3 (NEDO’s target), the calculated IRR can achieve 15% or more.
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