成果報告書詳細
管理番号20140000000198
タイトル*平成25年度中間年報 バイオマスエネルギー技術研究開発 戦略的次世代バイオマスエネルギー利用技術開発事業(実用化技術開発) 省エネルギー型下水汚泥・し尿汚泥固形燃料化システムの開発
公開日2014/6/21
報告書年度2013 - 2013
委託先名株式会社タスク東海 株式会社ドゥ・メンテックス
プロジェクト番号P10010
部署名新エネルギー部
和文要約
英文要約Title:Development of an energy saving system which produces solid fuel from raw sludge including human waste.(FY2013-FY2014)FY2013 Annual Report.

1.Development of a new system which dries raw sewage and human waste sludge to save energy. Three kinds of dry binder obtained from various food wastes are used as materials for adjusting the calorific value, ash produced, and the chlorine content of the human waste sludge. Through sludge testing, the optimal combination for initial granulation and a consistent process for reproducing the granules were established. As a result, it was found that human waste sludge should be granulated immediately after mixing with the food waste binders. For this process to be effective, it is necessary for the ratio of human waste sludge to food waste binder material to be 1:0.3 (by weight). However, the optimum compound ratio when drying naturally is 1:0.8~1.0 (by weight). Therefore, around three times the binding materials are required with this method.
Small scale tests were used to monitor the temperature and moisture content of the sludge as it dried, against the wind speeds and sun strength. It was observed that the optimum rate of natural moisture volatilization was at wind speeds between 0.3~1.1 m/s. However, over and above the drying effect of the wind, it was determined that the sun’s power was the predominant factor in the drying rate of the sludge.
・Drying tests were scaled up to a more practical level of 100kg, then the drying rate of the winter season was examined. The time taken for the sludge to dry became 5~6 days (20% under) with an average of 2~4°C outside air temperature. Under 7 days was the target for the natural drying process.
・A portable compact through-flow air drying system which can be used to demonstrate the process was developed. Tests established that the most effective method of drying was for the aeration to go from bottom to top.
・In continued drying tests with the machine, it was harder to dry than anticipated.
Causes for this problem were the amount of ventilation in the areas the machine was demonstrated along with the humidity levels. These problems were solved by increasing the minimum required temperature and extending the duration of the drying process.

2.Development of a granular solid fuel combustion system.
Burning tests was carried out using the raw sludge combustion equipment which Kumamoto University developed. As a result, a continuous combustion system was developed, and tests established that burning the granular fuel at a rate of 44.4kg/h produced energy levels of 4000kcal/h.

3.Verification for enlargement
The continuation through-flow drying system in 1/20 scale is manufactured.
And development of highly efficiently boiler is attained.
 
4.Establishment of a measure about environment and health
No problem ammonia, the odor intensity index.
The result of coliform group measurement was 1300 MPN/g.
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