Thermodynamic analysis of a biomass gasifier driven combined power and ejector - absorption refrigeration (CPER) system

Abstract

This paper provides the thermodynamic study of an advanced power, cooling and refrigeration system which derives the required energy from biomass gasification and waste heat recovery operated ejector - absorption refrigeration system. The system deploys refrigerants such as R-141b and lithium bromide - water mixture as the working fluids which eventually generates the cooling and refrigeration simultaneously with stack gases. First and second law efficiencies are calculated to determine the effects of the crucial thermodynamic properties on turbine inlet temperature to heat recovery steam generator, turbine inlet pressure, evaporator temperature, change in biomass materials and then exergy destruction of each components of the system. It is observed that both first and second law efficiencies of the system decreases with increase in turbine inlet pressure but rises considerably with the increase in turbine inlet temperature. It is further observed that both the efficiencies rises with the employment of an ejector and absorption refrigeration by approximately 6.22% and 3.21% as compared to combined power cycle. Exergy analysis presented in this paper will gives a new dimension to the future researches in terms of reduced environmental impact and energy conservation.