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POWER GENERATION MODEL BASED ON A TRANSCRITICAL CYCLE WITH AN INCREASING-PRESSURE ENDOTHERMIC PROCESS USING CO2-BASED MIXTURE WORKING FLUIDS FOR AN ENHANCED GEOTHERMAL SYSTEM
POWER GENERATION MODEL BASED ON A TRANSCRITICAL CYCLE WITH AN INCREASING-PRESSURE ENDOTHERMIC PROCESS USING CO2-BASED MIXTURE WORKING FLUIDS FOR AN ENHANCED GEOTHERMAL SYSTEM
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机译:强化地热系统中基于跨临界循环的二氧化碳混合工质升压吸热发电模型
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摘要
It is provided a power generation model based on a transcritical cycle with an increasing-pressure endothermic process using CO2-based mixture working fluids for an enhanced geothermal system, including a geothermal water circulation, a mixture working fluid circulation and a cooling water circulation. A coaxial pipe-in-pipe downhole heat exchanger is provided in the mixture working fluid circulation. Innovations are reflected in that an increasing-pressure endothermic process is achieved due to making use of gravity and hence increase a heat quantity absorbed in a cycle, thereby improving power generation quantity of the cycle; and a binary mixture working fluid composed of CO2 and an organic working fluid is adopted to realize a transcritical power cycle with an increasing-pressure endothermic process and a decreasing-temperature exothermic process, thereby effectively reducing irreversibility of a heat transfer between a working fluid and a heat source and improving power cycle efficiency.
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