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Optimizing the CSP-Calcium Looping integration for Thermochemical Energy Storage

机译：优化用于热化学能量存储的CSP-钙循环集成

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摘要

Thermochemical energy storage (TCES) is considered a promising technology to overcome the issues of intermittent energy generation in Concentrated Solar Power (CSP) plants and couple them with yearly electricity demand. The development of this technology could favor the commercial deployment of CSP, which is considered as a key factor for new challenges in reducing GIG emissions. Among other possibilities, using the Calcium Looping (CaL) process for TCES is an interesting choice mainly due to the low cost of natural CaO precursors such as limestone (below $10/ton) and the high energy density that can be achieved (around 3.2 Qj/m(3)). This manuscript explores several configurations in order to maximize the performance of the CSP-CaL integration with the focus on power cycle integration in the carbonator zone. For this purpose, firstly, a discussion about the possibility of using open and closed power cycles is carried out, which leads to the conclusion that a CO2 closed cycle is more appropriate. Then, a closed regenerative CO2 Brayton cycle is analyzed in further detail and optimized by means of the pinch-analysis methodology. A main output is that high plant efficiencies (of about 45%) can be achieved using a simple closed CO2 Brayton power cycle. The optimized integration layout shows good performances at carbonator to turbine outlet pressure ratios around 3, thus allowing for a feasible integration of the power cycle in the CSP-CaL system. (C) 2017 Elsevier Ltd. All rights reserved.
机译：热化学能存储（TCES）被认为是一种有前途的技术，可以克服集中式太阳能发电厂（CSP）的间歇性发电问题，并将其与每年的电力需求相结合。这项技术的发展可能有利于CSP的商业部署，这被认为是减少GIG排放的新挑战的关键因素。在其他可能性中，对TCES使用钙环化（CaL）工艺是一个有趣的选择，这主要是由于天然CaO前体的成本低，例如石灰石（低于10美元/吨）和可实现的高能量密度（约3.2 Qj）。 / m（3））。该手稿探讨了几种配置，以最大程度地发挥CSP-CaL集成的性能，并着重于碳化器区域中的功率循环集成。为此，首先，进行了关于使用开式和闭式功率循环的可能性的讨论，这得出结论，CO2闭路循环更合适。然后，进一步分析闭合的二氧化碳再生布雷顿循环，并通过捏分析方法对其进行优化。一个主要的输出是使用简单的封闭式CO2布雷顿（Brayton）功率循环可以达到很高的工厂效率（约45％）。优化的集成布局在碳酸化器与涡轮出口压力比约为3的情况下显示出良好的性能，因此可以在CSP-CaL系统中实现功率循环的可行集成。 （C）2017 Elsevier Ltd.保留所有权利。

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