储能的低温空气分离系统热力学与经济性分析

In this study, a combination of air separation unit and liquid air energy storage technology is employed to realize large-scale power demand management of a cryogenic air separation system. The surplus air is compressed, liquefied and stored during valley electricity periods, while the stored liquid air is directly recycled to the distillation column as raw material during peak electricity periods, thus increasing valley electricity consumption and decreasing peak electricity consumption. An air separation unit with liquid air energy storage (ASU-LAES) system producing oxygen with a standard state volume flow rate of 10 165 m'Vh shifts the annual compression electricity consumption by 20% from peak periods to valley periods, resulting in a saving of 1. 3% - 6. 8% per year on the electricity costs as compared to a conventional air separation system. The daily compression electricity consumption for oxygen production is 0. 349 kW • h/m3. The equipment investment is RMB 4 034. 8X101. The dynamic payback period is 4. 6-5. 2 a. The ASU-LAES system helps to reduce the peak power supply pressure of the power grid, takes advantage of the peak-valley electricity price policy, and brings economic benefits to the system.