Dynamic Thermodynamic Performance Study of the Reactor Within the Combined Compressed Air and Thermochemical Energy Storage System

doi:10.7652/xjtuxb202402001

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Dynamic Thermodynamic Performance Study of the Reactor Within the Combined Compressed Air and Thermochemical Energy Storage System

更新时间：2025-05-13

- Dynamic Thermodynamic Performance Study of the Reactor Within the Combined Compressed Air and Thermochemical Energy Storage System
- Vol. 58, Issue 2, Pages: 1-11(2024)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202402001
  CLC： TK02
- Online First：10 February 2024，
  
  Published：2024
- 稿件说明：
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Dynamic Thermodynamic Performance Study of the Reactor Within the Combined Compressed Air and Thermochemical Energy Storage System[J]. 2024, 58(2): 1-11.
DOI：

Dynamic Thermodynamic Performance Study of the Reactor Within the Combined Compressed Air and Thermochemical Energy Storage System[J]. 2024, 58(2): 1-11. DOI： 10.7652/xjtuxb202402001.

摘要

针对压缩空气与热化学复合储能系统中

由于压缩机的波动运行而导致的反应器不稳定运行问题

通过建立热化学反应过程完备的数理模型

探究了不同工况参数对反应器内工质传热特性和甲醇裂解性能的影响规律

进而建立了反应器的运行调控策略

以实现其内部热能到化学能的高效稳定转化。研究结果表明:在反应器的变工况运行过程中

反应器内反应物和空气温度在气体流动方向分别呈现升高和降低的趋势; 甲醇裂解率随空气流量和反应器空气侧入口温度的增加而增加

随甲醇流量的升高而逐渐降低

反应器空气侧入口温度的扰动对甲醇裂解率的影响程度最大

而反应器内甲醇裂解率对甲醇流量扰动的响应速度最快; 通过建立前馈加反馈调控策略

分别控制进入反应器和压缩机的工质流量

在压缩机85%～110%的输入功率范围内

反应器可在1 000 s内实现95%的甲醇裂解率

证明了所提出调控策略的快速响应性和有效性。

Abstract

Aiming at the issue of unstable operation caused by the fluctuating operation of air compressor in the combined compressed air and thermochemical energy storage system

a comprehensive mathematical model of thermochemical process is established to study the effects of different operating parameters on the heat transfer characteristics of the working fluids and methanol decomposition efficiency of the reactor. The operation control strategy of the reactor is further established to achieve the efficient and stable transformation from thermal energy to chemical energy. The results show that when the reactor operates under variable working conditions

the temperature of reactant and air increases and decreases respectively along the flow direction in the reactor. The methanol decomposition efficiency is improved by increasing the flow rate of air and inlet temperature on the air side of the reactor

and is reduced by increasing the flow rate of methanol. The disturbance of inlet temperature on the air side of the reactor has the greatest effect on the variation range of the methanol decomposition efficiency

while the reactor has the fastest response to the variation of the flow rate of methanol. Subsequently

by establishing the feedforward-feedback control strategy to regulate the flow rate of working fluid at the inlet of both reactor and air compressor

the methanol decomposition efficiency of reactor could achieve 95% within 1 000 seconds under the air compressor input load of 85%—110%

which proves the fast response and effectiveness of the proposed control strategy.

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references

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