Dynamic simulation of integrated rock-bed thermocline storage for concentrated solar power
Dynamic simulation of integrated rock-bed thermocline storage for concentrated solar power
复制标题
DOI：
10.1016/j.solener.2014.10.021
复制
发表时间：
2014-12
期刊：
影响因子：
6.7
通讯作者：
N. Mertens;Falah Alobaid;Lorenz Frigge;B. Epple
中科院分区：
文献类型：
--
作者：
N. Mertens;Falah Alobaid;Lorenz Frigge;B. Epple
与风能和光伏相比，聚光太阳能发电厂可以配备热能储存，以消除间歇性能源供应和电网馈入。本研究的重点是对塔式太阳能发电厂的成本效益存储概念进行技术评估。由石英岩床组成，充满热空气流，由冷空气逆流排出，存储基本上像再生器一样运行。对于这样的系统，排放温度通常随时间下降。此外，随机填充床的使用导致相当大的压力损失。为了描述相关的流动和传热机制，在用于热存储的岩石床，数学模型的建模语言Modelica编写的开发和验证。与文献中的实验数据吻合良好。借助验证模型，在半工业规模的太阳能发电厂（1.5 MWel）的应用岩床蓄热设计和优化的充电和放电循环过程中的工厂的电效率。存储容量相当于四个小时的满负荷运行。结果表明，压缩机的工作应直接考虑在选择填充床的几何形状，以尽量减少在太阳能发电厂的存储集成的效率惩罚。
In contrast to wind and photovoltaic, concentrated solar power plants can be equipped with thermal energy storage in order to decouple intermittent energy supply and grid feed-in. The focus of this study is the technical evaluation of a cost-efficient storage concept for solar tower power plants. Consisting of a quartzite-rock bed that is charged with a hot air flow and discharged by cold air counter-flow, the storage essentially operates like a regenerator. For such systems, the discharge temperature typically declines with time. Furthermore, the use of a randomly packed bed results in considerable pressure loss. In order to describe the relevant flow and heat transfer mechanisms in rock beds used for thermal storage, a mathematical model written in the modelling language Modelica is developed and validated. Good agreement with experimental data from literature is obtained. With the aid of the validated model, a rock-bed thermal storage for application in a semi-industrial scale solar power plant (1.5 MWel) is designed and optimised with respect to electrical efficiency of the plant during the charge and discharge cycle. The storage capacity is equivalent to four hours of full-load operation. Results show that compressor work should be considered directly in the selection of packed-bed geometry in order to minimise the efficiency penalty of storage integration in the solar plant.