Abstract:

Advanced adiabatic compressed air energy storage (AA-CAES) is a promising technology for solving the problem of renewable energy power consumption. To improve the efficiency of AA-CAES, it is proposed to use direct contact heat exchangers as reheater to make full use of system compression heat. In this paper, the pressurized humidifier experimental system and air-water system is used to study the direct contact heat transfer process. An experimental setup with the foam ceramic corrugated packing was tested under pressurized conditions. The liquid flooding characteristics of the packing were analyzed. The effects of the operating pressure, the water-gas ratio, the inlet water temperature and the inlet air specific enthalpy on the volume mass transfer coefficient and the effectiveness were investigated. The results show that the volume mass transfer coefficient of the packing increases with the increasing water-gas ratio and decreases with the increasing inlet water temperature, while the efficiency decreases with the increase of the water-gas ratio and increases with the increase of the inlet water temperature. The influence of the inlet air specific enthalpy on the direct contact heat transfer process is relatively small. For AA-CAES, when designing direct contact heat exchange processes, the water-gas ratio is proposed to be taken as 1.0—1.2, and the operating pressure is proposed to be taken as 0.3—0.4 MPa.

Key words: compressed air energy storage, direct contact heat exchange, packing, heat and mass transfer, effectiveness

摘要：

为提高压缩空气储能系统效率，提出将直接接触换热器用作再热器以充分利用系统压缩热。利用加压湿化器实验系统和空气-水体系，研究了加压条件下基于泡沫陶瓷板波纹填料的直接接触换热过程，分析了填料液泛特性，以及操作压力、水气比、进口水温、进口空气比焓等参数对体积传质系数和效能的影响。结果表明，填料体积传质系数随水气比增加呈增大趋势，随进口水温的升高呈减小趋势，而效能随水气比的增加呈减小趋势，随进口水温升高呈增大趋势。进口空气比焓对直接接触换热过程的影响较小。对压缩空气储能系统，直接接触换热工艺设计时，水气比宜取为1.0~1.2，操作压力宜取为0.3~0.4 MPa。

关键词: 压缩空气储能, 直接接触换热, 填料, 传热传质, 效能