Novel designs of hybrid thermal energy storage system and operation strategies for concentrated solar power plant
Novel designs of hybrid thermal energy storage system and operation strategies for concentrated solar power plant
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DOI：
10.1016/j.energy.2020.119281
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发表时间：
2020-11
期刊：
影响因子：
9
通讯作者：
Zhaoshuai Ma;Mingjia Li;K. M. Zhang;Fan Yuan
中科院分区：
文献类型：
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作者：
Zhaoshuai Ma;Mingjia Li;K. M. Zhang;Fan Yuan
填充床蓄热技术与双罐蓄热技术相比，具有成本低、利用率低等优点。本文提出了两种新型的混合储能系统（HTESS），即PBTES和TTES，以及相应的运行策略：HTESS-TS用于温跃层储能，HTESS-OTC用于出口温度控制。首先，详细介绍了HTESS-TS和HTESS-OTC的结构和运营策略。在此基础上，对HTESS和仅含PBTES的单罐储能系统（STESS）在独立运行状态下的热力性能和经济性能进行了比较。其次，分析了TTES的截止温度和热容量的影响。最后，在实际太阳辐射条件下，对采用不同蓄热系统的聚光型太阳能发电厂的全年性能进行了比较。结果表明，与STESS相比，HTESS-TS和HTESS-OTC的效用因子分别提高了12.5%和22.1%。同时，HTESS-OTC的单位成本比STESS低8.6%。此外，对于宽范围的出口温度限制，HTESS-OTC可以保持更稳定的出口温度，比STESS更高的利用系数。与STESS相比，HTESS-TS和HTESS-OTC的年发电量分别增加了9.8%和14.1%。
Packed-bed thermal energy storage (PBTES) has advantage of being relatively low cost, but suffers from low utility factor, compared with two-tank thermal energy storage (TTES). This paper proposes two new designs of hybrid thermal energy storage system (HTESS), consisting of PBTES and TTES, and corresponding operation strategies: HTESS-TS for thermocline storage and HTESS-OTC for outlet temperature control. Firstly, structures and operation strategies of HTESS-TS and HTESS-OTC are described in detail. Then, thermal and economic performances of HTESS and single-tank thermal energy storage system (STESS) only containing PBTES in stand-alone state are compared. Next, effects of cut-off temperature and thermal capacity of TTES are analyzed. Finally, under realistic solar radiation, annual performance of concentrated solar power plant (CSP) with different thermal energy storage systems are compared. Results show that compared with STESS, utility factors of HTESS-TS and HTESS-OTC are improved by 12.5% and 22.1% respectively. Meanwhile, unit cost of HTESS-OTC is 8.6% lower than that of STESS. In addition, for a broad range of outlet temperature limits, HTESS-OTC can maintain more stable outlet temperature, higher utility factor than STESS. Compared with STESS, annual generated electricity induced by HTESS-TS and HTESS-OTC increase by 9.8% and 14.1% respectively.