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The Maloney and Robertson cycle differs from the traditional Rankine cycle by the way it integrates a mixture as working fluid and a flash tank. A schematic of the cycle is depicted on Figure 2.16. The heater/boiler delivers a vapor rich in ammonia (6). The vapor is then superheated (7). Power is obtained by expanding the vapor to low pressure in a turbine. The turbine exhaust (8) is reunited with the weak solution from the distillation unit (11) and is used to absorb the rich vapor in ammonia to regenerate the basic solution (1). The basic solution is then pumped to a high pressure and then heated and partially boiled before entering the flash tank (5) to complete the cycle. Hot (13) and cold (16) fluids are used as the heat source and sink, respectively. Maloney and Robertson performed the thermodynamic analysis of their cycle based on the configuration shown in Figure 2.16, and their conclusion showed that the absorption cycle in this configuration, has no thermodynamic advantage over the Rankine Cycle and didn‘t continue their investigations (Ibrahim and Klein, 1996). 2.5.4.2 Kalina cycle Separator Evaporator 1 3 11 2 5 4 6 7 Condenser 8 Turbine HT recuperator 10 9 P LT recuperator Feed pump Figure 2.17 – Schematic diagram of the Kalina cycle process (Source: Ogriseck, 2009) Alexander I. Kalina continued the work of Maloney and Robertson on absorption power cycles and proposed several cycle designs for application in geothermal as well as in biomass power plants (Mlcak, 2002). The first of what is known as ―Kalina Cycle‖ was Page | 51PDF Image | Low-Grade Heat Conversion into Power Using Small Scale Organic Rankine Cycles
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