Performance analysis on a hot dry rock geothermal resource power generation system based on Kalina cycle

摘要

Based on the conventional Kalina cycle, a hot dry rock geothermal resource power generation system is recommended in this paper. To predict the system performance, the corresponding thermal calculation model is established. A high pressure condenser and a low pressure condenser are used to condense the working fluid(Ammonia-water mixture) and the basic fluid in the recommended system, respectively, and a regenerator is adopted to recover part of exhaust heat of the turbine, at the same time to provide energy for the separation of ammonia-water mixture. The parameter performance analyses are carried out on the system. Results show that both the thermal efficiency and dynamic power recovery increase with elevation of heat source temperature, the dynamic recovery efficiency varies in the range of 8.5-18 percent, in the heat source temperature range of 150-220 °C. and the geothermal recovery efficiency varies in the range of 86 to 88 percent. A relative low basic solution concentration and a high working fluid concentration is helpful to improve the system efficiency under the satisfied separation condition. The minor variation of the system efficiency with variation of circulating ratio indicates that the vary of circulating ratio due to the environmental elements will not cause greet effect on system performance.