A salt based integrated thermal store and heat exchanger for CAES systems
A salt based integrated thermal store and heat exchanger for CAES systems
复制标题
用于 CAES 系统的盐基集成热库和热交换器
DOI：
10.1049/icp.2023.1559
复制
发表时间：
2023
期刊：
影响因子：
--
通讯作者：
Cardenas B
中科院分区：
文献类型：
--
作者：
Cardenas B
本文探讨了集成的热存储器（HeS）与热交换器（HX）到一个单一的单元，执行两个功能（HeSX）。该概念旨在用于压缩空气储能系统（CAES），但它与其他热机械储能系统（例如泵送热）兼容。动机是降低CAES系统的总成本。HeSX装置可以直接由压缩空气流充能，省去了辅助的环境压力空气回路。海盐被认为是由于其高的热容量，相对较好的导热性，并能够适应钢管的热膨胀而不会失去良好的热接触的储热材料。我们使用海上风力驱动的CAES系统（15兆瓦，180兆瓦时）作为案例研究。没有多少商业CAES系统在运行，但通常CAES系统的储热子系统（填充床储热器、热交换器和次级环境压力回路）的平准化成本在45至48 £/MWh的范围内。这里发现的最具成本效益的HeSX设计实现了低得多的平准化成本，约为31.5 £/MWh，资本成本约为55 k英镑。该装置实现了93.7%的总往返火用效率（压力和热量），尽管不考虑对环境的损失。HeSX单元显著降低了成本，并简化了整体架构。
This paper explores the integration of a heat store (HeS) with a heat exchanger (HX) into a single unit that performs both functions (HeSX). The concept is intended for compressed air energy storage systems (CAES), but it is compatible with other thermo-mechanical energy storage systems (e.g. pumped heat). The motivation is to reduce the overall cost of CAES systems. An HeSX unit can be directly charged by the stream of compressed air, eliminating the auxiliary ambient-pressure air circuit. Sea salt is considered as the heat storage material due to its high heat capacity, relatively good thermal conductivity, and its ability to accommodate the thermal expansion of steel pipes without losing a good thermal contact.We use an offshore-wind-driven CAES system (15 MW, 180 MWh) as a case study. There are not many commercial CAES systems in operation, but typically the levelized cost of a CAES system's heat storage subsystem (packed bed thermal store, heat exchangers and secondary ambient pressure circuit) is in the range of 45 to 48 £/MWh.The most cost-effective HeSX design found here achieves a much lower levelized cost of ~31.5 £/MWh with a capital cost of ~£55k. This unit achieves an overall roundtrip exergy efficiency (pressure and heat) of 93.7 %, although losses to the environment are not considered. The HeSX unit offers a significant cost reduction and simplifies the overall architecture.