PERFORMANCE EVALUATION OF THE TWO-FLUID CYCLE IN MUNICIPAL SOLID WASTE-BURNT POWER GENERATION

An improvement of energy conversion efficiency is important for energy saving and for solving the global environmental problems. The two-fluid cycle is dealt with for municipal solid waste(MSW)-burnt electric power generation, using 6 kinds of fluid such as NH₃, C₅H₁₂, C₆H₆, and H₂O as the working fluid at the bottoming cycle against water on the topping cycle. The performance characteristics of the two-fluid cycle are calculated and the optimum cycle conditions, which maximize the plant's thermal efficiency, are determined for the respective working fluid. As a result, it is shown that the plant's thermal efficiency was increased from 17.6 % to 21.3 % for the single Rankine cycle by the adoption of the two-fluid cycle, using C₆H₆ as the working fluid under a constant condition of the topping steam temperature of 295°C.