著者

木室 洋介 古林 敬顕 中田 俊彦

出版者

一般社団法人 日本エネルギー学会

雑誌

日本エネルギー学会誌 (ISSN:09168753)

巻号頁・発行日

vol.90, no.3, pp.247-257, 2011 (Released:2011-03-31)

参考文献数

39

被引用文献数

8 4

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In this study, 13 types of sewage energy system are evaluated by using inventory analysis. Evaluation indexes are energy balance, greenhouse gas emission, and economic efficiency. The main equipment of those energy systems are three types of incineration, three types of solid fuel, two types of pyrolysis gasification, and five types of digestion. The range of evaluation is from sewage sludge to power generation. Inputs of those energy systems are electricity, city gas, light oil, and wood biomass, and outputs are production of electricity, CO2 gas, and N2O gas. The results from the viewpoint of energy balance show that only the systems with gasification furnace produce larger electricity generation than total consumption. The results about the greenhouse gas emission show that the lowest gas emission system is the system with solid fuel produced by drying. N2O gas emitted by solid fuel is lower than the others. The results about the economic efficiency show that the lowest cost system is the systems with solid fuel because the construction cost that holds most of total cost is much lower than the other systems.

著者

大下 紘史 古林 敬顕 中田 俊彦

出版者

The Japan Institute of Energy

雑誌

日本エネルギー学会誌 (ISSN:09168753)

巻号頁・発行日

vol.90, no.11, pp.1047-1056, 2011

被引用文献数

3

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Recently, the microalgae that can produce fats and hydrocarbons attracts a lot of attention as means to solve the issue of global warming. The purposes of this study are to design microalgae-based biodiesel fuel (BDF) production system using exhaust gas from thermal power plants and considering regional characteristics, and to analysis potential of the microalgae from the viewpoint of energy balance, CO<SUB>2</SUB> balance and fuel production cost. The system consists of five components: Culture, harvesting, extraction, transportation, conversion. In addition, the methodology of this study has three processes: Allocating microalgae culture plants and BDF production plants, optimizing transportation using Geographic Information System (GIS) with Network Analyst, and evaluating energy balance and CO<SUB>2</SUB> reduction of the system. Besides, to minimize BDF production cost, we change the number of BDF production plants and consider trade-off between transportation cost and BDF production plants costs. The result shows that microalgae-based BDF production system has high potential for CO<SUB>2</SUB> reduction and the possibility to competitive with the fossil fuel cost.