Evaluation of Annual Efficiencies of High Temperature Central Receiver Concentrated Solar Power Plants With Thermal Energy Storage
Evaluation of Annual Efficiencies of High Temperature Central Receiver Concentrated Solar Power Plants With Thermal Energy Storage
复制标题
具有热能存储的高温中央接收器聚光太阳能发电厂的年效率评估
DOI：
10.1016/j.egypro.2014.03.081
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
D. D. Gill
中科院分区：
文献类型：
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作者：
B. Ehrhart;D. D. Gill
目前的研究已经检查了四个案例的中央接收器集中的太阳能发电厂与热能储存使用DELSOL 3和SOLERGY计算机代码。将当前最先进的基本情况与理论高温情况进行了比较，理论高温情况是基于一些输入参数的缩放和基于能源部SunShot倡议的性能目标的其他参数的估计。这种比较是在两种配置中针对电流和高温情况进行的：具有外部圆柱形接收器的环绕场和具有单腔接收器的北场。所有四种情况下的光学设计都是使用DELSOL 3计算机代码完成的;然后将结果传递到SOLERGY计算机代码，该代码使用历史典型气象年（TMY）数据来估计一年运行过程中的电厂性能。四个案例中的每一个的大小都是为了产生100 MWe的总电力，具有显着的液体热存储容量，以满额定生产水平产生6小时的电力，并且具有1.8的太阳能倍数。设计点和年平均性能之间存在相当大的差异。最大的差异在于太阳能场和接收器子系统，以及由于热能存储器满负荷而导致的能量损失。当前研究中另一个值得注意的发现是，基本情况和高温情况之间的年平均效率差异相对较小。对于Surround Field和North Field情况，尽管热电转换效率提高了8%以上，但年度太阳能发电效率的提高幅度均<2%。其原因包括由于较高温度操作而增加的热损失以及由于设备子系统的启动和关闭而导致的操作损失。热能储存可以通过利用更大的热能储存来减轻这些损失中的一些，以确保电力生产系统不需要经常停止和重新启动，但太阳能本质上是瞬态的。这里没有考虑经济和成本因素，但将对太阳能热电生产战略和规模产生重大影响。
The current study has examined four cases of a central receiver concentrated solar power plant with thermal energy storage using the DELSOL3 and SOLERGY computer codes. The current state-of-the-art base case was compared with a theoretical high temperature case, which was based on the scaling of some input parameters and the estimation of other parameters based on performance targets from the Department of Energy SunShot Initiative. This comparison was done for both current and high temperature cases in two configurations: a surround field with an external cylindrical receiver and a north field with a single cavity receiver. The optical designs for all four cases were done using the DELSOL3 computer code; the results were then passed to the SOLERGY computer code, which uses historical typical meteorological year (TMY) data to estimate the plant performance over the course of one year of operation. Each of the four cases was sized to produce 100 MWe of gross electric power, have sensible liquid thermal storage capacity to generate electric power at full rated production level for 6 hours, and have a solar multiple of 1.8.There is a fairly dramatic difference between the design point and annual average performance. The largest differences are in the solar field and receiver subsystems, and also in energy losses due to the thermal energy storage being full to capacity. Another notable finding in the current study is the relatively small difference in annual average efficiencies between the Base and High Temperature cases. For both the Surround Field and North Field cases, the increase in annual solar to electric efficiency is <2%, despite an increase in thermal to electric conversion efficiency of over 8%. The reasons for this include the increased thermal losses due to higher temperature operation and operational losses due to start-up and shut-down of plant sub-systems. Thermal energy storage can mitigate some of these losses by utilizing larger thermal energy storage to ensure that the electric power production system does not need to stop and re-start as often, but solar energy is inherently transient. Economic and cost considerations were not considered here, but will have a significant impact on solar thermal electric power production strategy and sizing.