大都市域の清掃工場の最適な全体計画
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This paper proposes the optimal total planning for incinerator plants (IPs) in a typical urban area, which includes a method to decide plant number and capacity of IPs. Burnable municipal refuse is disposed sanitarily by high temperature incineration at IPs. At the same time, power generation by waste (PGW) is being conducted at many IPs as recovery of energy. In the present, generation energy of PGW is larger than that of wind power or PV. PGW, however, has weakness of generation efficiency and low generation output due to smaller capacity of IPs. To overcome above weakness, high efficient PGW is necessary with total integration and scaling up of IPs. Regarding total integration and scaling up, the operation in wider area is favorable from the view point of refuse volume and collection. In the planning stage, both cost of IPs and refuse collection which is important for the refuse disposal should be totally taken into account.The optimal total plan of IPs can be solved at two stages. First, disposal capacity of IP, Gk, for plant number K is decided by constraints. Gk is about the same capacity at each K because of maintenance and refuse collection, and is more than 300(t/d) with every 100(t/d) interval. Gk should be decided by not only refuse volume but also plant stop by maintenance or trouble. Second, cost of each K is calculated by construction/operation cost of IPs, selling energy income of PGW, and refuse collection cost. Therefore K with the minimum cost will be selected as the optimal plant number of IPs.From numerical simulation of 3 million population's area, the optimal plant number is proved to be four. On the other hand, in the present there are 8 or 9 IPs in 3 million's city. Cost reduction effect above will be about 15% than the present situation. Considering the situation of aging IPs, decrease trend of refuse volume and strict finance condition of local government, the proposal method is very effective and realistic.
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