关键词: 太阳能, LNG, 有机朗肯循环, ?, 热力学

Abstract: Aiming at the serious pollution caused by burning of the fossil fuel, to increase the proportion of clean energy in primary energy consumption in China, a new Organic Rankine Cycle system utilizing the solar energy and the cold energy of liquefied natural gas (LNG) was constructed to solve the problem of serious environmental pollution caused by fossil fuel combustion. The results showed that: the optimal net output power and thermal efficiency were obtained when the two cycle take the best evaporation pressure 2.8 MPa and the best evaporation temperature 371 K, the values are 81.46 kW and 20.88% respectively; when the evaporation pressure of two cycle is 3.0 MPa and the evaporation temperature is 371 K, the exergetic efficiency reaches the peak value 53.43%; the maximum exergy loss of the system is in the heat exchanger components, the exergy efficiency of solar collector is lower. According to 90% power generation efficiency and 1 yuan/(kW·h) electricity price, the system can bring economic benefits of more than RMB 530 000 per year. Compared with the same coal⁃fired power generation, it has the effect of SO2 emissions by 13 939 kg/a and CO2 emissions by 462 000 kg/a, which can achieve the effect of energy saving and emission reduction.

Key words: Solar energy, Liquefied natural gas, Organic Rankine Cycle, Exergy, Thermodynamics