heshmat gazori

Nowadays, due to the extensive application of renewable-based co-generation systems and also the economic and the environmental necessities, their design and thermodynamic analysis has been conducted by many scientists.In this way, a novel, simple, and practical combined power and hydrogen cogeneration unit has been designed in the present study in which there are gas turbine, gasifier, trans critical Rankine cycle, and proton exchange membrane electrolyzer.This system has been analyzed from first and second laws of thermodynamics by engineering equation solver(EES).The proposed system is able to generate power and hydrogen simultaneously for users.The power and hydrogen production capacities of the system are 3.92 MW and 608.8 cubic meter per hour, respectively which consumes biomass about 1.155 kg/s. The energy utilization factor and second law efficiency ofthe system are 34.71 % and 29.44 %, respectively. It can be seen that the overall exergy destruction of the system is 11854 kW in which gasifier, gas turbine, and combustion chamber have the highest irreversibilities. In addition, it can be concluded that the exergy efficiency of condenser and heat exchanger 3 are the lowest ones among other equipments.According to the parametric studies,it was found that the increasing the inlet temperature ofthe gas turbine has a positive effect and the increasing the maximum pressure ofthe TCO2 cycle has a negative effect on the EUF and the second law efficiency ofthe system.