储气室热力学特性对AA-CAES性能的影响

Influence of thermodynamic properties of air storage chamber on the performance of AA-CAES

储气室是先进绝热压缩空气储能系统(AA-CAES)中主要的储气装置,其特性对储气室内空气的温度和压力变化有重要影响。为了更加准确地描述系统运行过程中储气室内空气的热力变化过程并探究储气室热力学特性对系统性能参数的影响,本文建立壁面温度恒定的非绝热储气室模型,联合系统其他部件模型,求解AA-CAES系统热力学模型。分析模型求解结果可以发现,在设计系统参数下,储能效率为0.5839,储能密度为1.5954 k W·h/m^3,在运行过程中储气室整体表现为对外放热;绝热模型下系统储能效率最高,恒温模型下系统储能密度最大,在实际运行中系统性能参数较低,因此储气室热力特性有待优化;提高储能和释能功率可以使储能效率提升,其中储能功率变化对储能效率的影响更大。

Air storage chamber is the main gas storage device in the AA-CAES,and its properties have important impact on the variation of the air temperature and pressure. To describe the thermal variation of air during the operation process and accurately explore the influence of the thermodynamic properties on the system performance,a model of diabatic storage chamber with constant wall temperature was established in this paper. The results show that the designed chamber had the energy storage efficiency of 0.58 and has the energy storage density of 1.59 kW·h/m^3. The overall performance of the air storage chamber in the operation process is exothermic. Highest energy storage efficiency was obtained with the adiabatic model,and the energy storage density reached maximal under the constant temperature model. However the system performance parameters were lower in the actual operation,so the thermal properties of the air storage chamber need to be optimized. The energy storage efficiency can be improved by increasing the amount of energy storage and power released. It was found that the change of storage power had greater effect on storage efficiency.