Analyses of Environmental and Economic Benefits of Refuse Derived Fuel System

• Main Author: 張明益
• Other Authors: 曾四恭
• Format: Others
• Language: zh-TW
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/69856040081130956506

碩士 === 國立臺灣大學 === 環境工程學研究所 === 91 === The refuse derived fuel (RDF) technique in our country has been stagnated in the stage of information collection and model test. In the assessment of energy, economic and environmental aspects regarding refuse derived fuel, we acquire relevant information through the statistic data obtained from the running plants in Japan. Yet, due to the deviation of some basic properties in the refuse origin, we cannot reach further exploring and study regarding the diverse benefits of refuse derived fuel that may possibly appear if it’s practically performed in Taiwan. Meanwhile, we are unable to predict actually if there is a sufficient economic-market-benefit for the refuse derived fuel plant operated in Taiwan. This study is mainly through the result of planning and design as well as beneficial assessment of real plants under operation to reach the following three purposes: 1. Analyze and compare the deviation of diverse benefits between the RDF plants in Taiwan and Japan, 2. Simulate various operation plans and find out the best plan and its incentive of investment through economic analysis, and then acquire the direction of market exploration, 3. Compare the contribution toward the environmental benefit (for example, take the reduction of greenhouse gases emission regarding the greenhouse effect) of RDF operation with other handling plans of refuse, to accommodate to the reduction of flue gas emission amount in regard of the greenhouse effect. The result of this study is abstracted as follows: in the aspect of energy input manufactured by RDF, if we use 1 kg refuse as the calculation base, then the requirements of power and fuel oil are 0.307 kwh and 0.07L respectively, which is higher than Japan case (0.17 kwh and 0.0435L), hence the energy recovery rate for Taiwan RDF is relatively lower than Japan. As a result of economic assessment, under the best operation mode, the net present value of investment in this study case is about 50,785,000 (the net present value rate is 84.55%), the retrieving period is 8.5 years and the internal rate of return to investment is 13.58%, which seems to be a sound investing plan. The analyzing result of plan sensitivity shows that the income of refuse treatment fee is the most significant factor influencing the feasibility of this plan. When the unit refuse- treatment cost is above 2,060/MT, the plan is feasible. In the analyzing result of environmental benefit with regard to the reduction of greenhouse gases emission amount corresponding to the greenhouse effect, it shows that there is 1.71 kg equivalent of carbon dioxide that can be reduced by producing one kwh electric power from the dealing of RDF in lieu of burning the refuse directly. If we estimate that we will handle 20% of national refuse generated using RDF process, then it will totally reduce approximately 2.06 million equivalent of carbon dioxide generated and emitted to the atmosphere annually. And the Eco-efficiency index of RDF method dealing with refuse is 1.94 times higher than the large-scale refuse incinerating plant as well.