Combined power generation cycle of cold energy and low-temperature solar energy in LNG satellite station

For the LNG satellite station without industrial waste heat to be used, a combined power generation cycle of LNG cold energy and solar energy is proposed. The cycle can be divided into LNG cold energy power generation system and solar hot water system. The equipment in LNG cold energy power generation system is exergy analyzed: the exergy loss in heat exchanger accounts for 69.23% of the total exergy loss, and that in pump and expander accounts for 30.77% of the total loss. The effects of solar hot water temperature, LNG pressure and expansion pressure on the system performance are studied. The monthly heat collection and auxiliary heating capacity of solar collectors in Lhasa area are calculated by simulation software. The auxiliary heating capacity of solar hot water system is lower than that of LNG cold energy power generation system from May to January of next year, and the surplus energy is 113×10³ kWh. The temperature of solar hot water is adjusted to 50 ℃ within February to April in Lhasa. The auxiliary heating power required is lower than generation of LNG cold energy power generation system, and there is surplus power. Lhasa can obtain a total of 134.4×10³ kWh per year. In summer, the cooling circulating water in LNG cold energy power generation system can be used for cold water air conditioner, and the annual power saving benefit of cold water air conditioner is 5 808 yuan.