成果報告書詳細
管理番号20120000001044
タイトル*平成23年度中間年報 最先端PG(Mega-ton Water System) 浸透圧発電 流体解析と発電システム 
公開日2012/9/28
報告書年度2011 - 2011
委託先名協和機電工業株式会社
プロジェクト番号P09025
部署名環境部
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
(1) 原水水質の解析とその浄化処理最適化
浸透圧発電の原水(海水や濃縮海水と淡水)として要求される水質レベルとその指標についての検討は、試験水の各水質分析やフローサイトメーターを利用して水質指標について検討を行っていく。
英文要約(1) Analysis about quality of the raw water and optimization of the purification processing : Change of water quality was measured by taking sample water regularly and measuring its quality. About the flow cytometer, up to operation training step has been completed. Next year, investigations are planned concerning activity and distribution of bacteria in both raw and treated water. Through this research, data will be accumulated to classify and determine the kinds of bacteria. A study was carried out about low energy pre-treatment system using characteristics of nanofiber such as high absorption or low-pressure loss. First, investigation and manufacturing of nanofiber sheets were implemented. Then tests for filtration and biological treatment were carried out using these sheets. Some sheets with different diameters were prepared to measure their filtration speed. Tap water was used as raw water. The filtration speed of nanofiber sheets was faster than commercial membrane filters of 0.45 micro meters. It was 1.1-3.5 times. Next, treated sewage water which was filtered by UF membrane was used as raw water, and fouling index (FI) was measured. As a result, FI was improved from 3.2 to 2.3. However, more investigation is needed to measure its performance precisely. On the other hand, biological treatment is still under testing for further observation and analysis of water quality. (2) Optimization of membrane module structure : At a prototype plant, as a next step, a permeation examination was carried out for annual data accumulation by real module (10 inches). The collected data were given feedback for the flow analysis in the membrane module in Nagasaki University. In addition, a test for flow improvement is implemented based on flow analysis (simulation) in the membrane module. (3) Construction of the generation system : Possibility of the net output increase was inspected by changing conditions on the basis of annual data. According to the result of the test, we obtained the net output of 1.3-1.4 times as large as that of the standard value. The differences of operating conditions have a big influence on the net output. Therefore, further optimization is necessary. The increase and decrease of the permeation quantity influences choice of each machinery, resulting in influence on efficiency of the power generation system as a whole. The temperature change (concentration seawater) through this examination was 14-28 degrees Celsius in a year. And the rate of change of the permeation flow quantity per 1 degrees Celsius was 2.1% regarding 20 degrees Celsius as standard. The annual data of the prototype plant will be regarded as standard values and will be reflected in the future facility planning.
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