Author : Xinyue Peng
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (125 download)
Book Synopsis Optimization-based Design and Analysis of Concentrating Solar Power with Thermochemical Energy Storage by : Xinyue Peng
Download or read book Optimization-based Design and Analysis of Concentrating Solar Power with Thermochemical Energy Storage written by Xinyue Peng and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Concentrating solar power (CSP) with thermal energy storage has the potential for grid-scale dispatchable power generation. Thermochemical energy storage (TCES), that is, the reversible conversion of solar-thermal energy to chemical energy, has high energy density and low heat loss over long periods. In this work, we develop optimization-based models for the design and analysis of CSP with different fluid-phase and solid-gas TCES systems. By proposing various TCES process strategies, evaluating their system performance, and identifying key areas of improvement, we hope that our study will help accelerate TCES development and solar power deployment. Specifically, we first develop a general process model for CSP plants employing fluid-phase TCES systems. We illustrate our model applicability by using ammonia and methane TCES systems. The analysis allows us to identify pressure vessels for aboveground gas storage as the main cost driver and compressor electricity consumption as the main energy driver. The overall energetic and economic performance can be significantly improved if cheap underground gas storage is available. We then propose an optimization-based framework for process synthesis under variability in two frequencies. We introduce scenarios and modes to represent low and high frequency variability respectively, and formulate the synthesis problem as a multimode two-stage stochastic programming model. The proposed approach is well suited to address the synthesis of renewable energy systems where the energy resource (e.g., solar, wind) often exhibits variability in two scales. Next, we develop an optimization model for the design and operation of CSP plants employing solid-gas TCES systems. Special emphasis is placed on the modeling of fixed-bed reactors that operate in a cyclic batch mode, which are modeled using partial differential equations in time and space. Finally, we provide a system-level analysis for CSP employing various solid-gas TCES strategies, that is, different combinations of chemical reactions and process configurations. Six process configurations are proposed and three types (carbonate, hydroxide, and redox) of reactions are studied. Results show that, six out of the nine strategies have the potential to improve energy efficiency and reduce costs at the same time over two-tank molten salt storage. We also analyze the impacts of key reaction properties and process parameters on system performance.