不同有机工质下的燃气分布式能源光热补偿供能系统研究

Research on the combined cycle energy supply system of solar-heat compensation for gas distributed energy under different organic working fluids

为了提高能源利用率,实现节能减排,以总能系统概念为基础,采用燃气和太阳能为能源,水蒸气与有机工质为工作介质,建立燃气分布式供能系统的热力模型和能效模型,对其热经济性和有机工质进行了计算与筛选。以国内某机场分布式能源站机组为例,基于太阳能的能源补充作用以及有机工质气化潜热小的特性,建立燃气分布式能源光热补偿供能系统,经热经济性计算与分析,结果表明:在100%、75%、50%制冷(制热)工况时、新模型在维持原机组总热耗的情况下,机组冷源损失减少,热经济性提高;经过对3种有机工质的筛选,R245FA是较适合于新模型的有机工质。

In order to improve energy efficiency and realize energy-saving and emission reduction, thermodynamic model and energy efficiency model for distributed energy supply system were built based on the concept of total energy supply, where it took natural gas and solar as energy, and water vapor and organic fluid as working medium, And the thermal economy is calculated and organic working fluids were screened. Taking a domestic airport distributed energy unit for example, considering the complementary role of solar energy and the small latent heat of vaporization of organic working fluid characteristics, the distributed energy supply system combining natural gas, solar steam and organic working fluid was built. The thermal economy calculation results show that under the 100%, 75%, 50% cooling(heating) conditions, the new model maintains the total heat consumption of the original unit, the cold source loss of the unit reduces and the thermal economy improves. By screening 3 organic working fluids, R245FA is the more suitable organic working fluid for new model.