ORC and Kalina cycles can produce power from low-temperature heat sources. There is, also, a great potential in Liquid Natural Gas gasification units to generate power derived from cold energy within these streams. This work proposes a new power generation plant to convert the trapped energies of geothermal hot water and Liquid Natural Gas streams to useful power. The combined power plant consists of 7 units, which each unit includes three discrete cycles of Kalina and two Organic Rankine power generation cycles to produce power from its heat sources. Geothermal hot water is supplied at 163 °C and pressure of 7 bar with a mass-flow of 39 kg/s from a geothermal well, and moreover, natural gas is supplied at −162 °C and pressure of 10 bar with a mass-flow of 8 kg/s to each unit of the power plant as a cold source. Energy and exergy analyses have been employed to evaluate the performance of the proposed plant. The energy analysis shows that each unit of the proposed plant could produce 1924 kW net power and the energy efficiency of each unit is 13.25%. On the other hand, the exergy analysis reveals that the exergy efficiency of each unit of the proposed plant is 26.13%, while each unit could recover 57% exergy of the LNG stream. Considering the results of the energy and exergy analyses along with sensitivity analysis, the system is amended to maximize the exergy efficiency, which after implementing modifications, the exergy efficiency of the system increases to 32.15%. Also, the net power output of each unit increases to 2485 kW after modifications.
کلید واژگان :Organic Rankine cycle ; Geothermal energy; Liquid natural gas; Exergy analysis; Cold energy recovery
ارزش ریالی : 600000 ریال
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