热空气注入式液氮能量转换装置效率分析

液化空气储能是指在电网负荷低谷期将电能用于压缩空气成液态，在电网负荷高峰期释放液化空气气化推动汽轮机发电的储能方式。由于液态空气的低温特性和压缩特性，其储存的能量包含冷能和膨胀能两部分能量。能量的组成和数量与气化压力p0有关。过去的液空能量转换装置仅仅利用了膨胀能，而忽略了冷能，这导致了其效率低下。热空气注入式能量转换装置提出了通过回收低温冷能提高发动机的效率。理论效率可以通过提高工作压力来提高。最后提出了寻求一个有效的方法同时利用膨胀能和冷能来提高液态空气储能系统的效率为未来液态空气储能研究的趋势。

Efficiency Analysis of Energy Conversion Device for Hot Gas Injected into Liquid Nitrogen

Liquid air storage refers to the energy storage mode of storing power by compressing air into liquid phase while the power load is in the hollow, and consuming it by releasing liquid air into gas phase and let it drive the turbine to generate electricity while the power load is in the peak. Due to its low temperature characteristics and compressibility, the energy that can be stored contains cryogen energy and expansion energy. The composition and the quantity of energy are related to the gasification pressure p0. The energy conversion device that prior works have devoted much attention to could only make use of the expansion energy, while the cryogenic energy is usually disregarded, which results in poor efficiency of the engines. The hot gas injected into liquid nitrogen energy conversion device is proposed to improve the efficiency of the engine through recover the cryogenic energy. Finally, the liquid air energy storage is proposed to improve the efficiency by making use of both the cryogenic energy and the expansion energy.