Analysis of triple combined cycle with MHD generator as a topping cycle

So far, several combined cycles have been proposed with MHD generator as a topping cycle and gas turbine or steam turbine as bottoming cycles. Triple cycle which is examined in this study is a modification of all dual cycles has been proposed in different papers. Most of available cycles are dual. High temperature of hot gases exhausted from the MHD generator, was the motivation to consider the performance of triple cycles in this paper. The MHD generator is employed as a topping cycle, Brayton (gas turbine) as an intermediate and Rankine cycle (steam turbine) as a bottoming. Combined cycle analysis showed that, efficiency of the proposed triple combined cycle is 65%. Efficiency of proposed cycle is greatly more than that of a dual one. In addition, unlike previous researches that declared the use of triple combined cycle with a MHD as topping generator is practical only by employing a supplementary firing; the present work showed that without using of a supplementary firing, triple combined cycle has still an acceptable performance.