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收稿日期:
2024-01-24
修回日期:
2024-07-12
出版日期:
2024-07-16
通讯作者:
赵长颖
作者简介:
吕潇峻(1999—),男,硕士研究生,lvxiaojn@sjtu.edu.cn
基金资助:
Xiaojun LV(), Changying ZHAO(), Jun YAN
Received:
2024-01-24
Revised:
2024-07-12
Online:
2024-07-16
Contact:
Changying ZHAO
摘要:
针对Ca(OH)2/CaO热化学储热体系的放热过程,提出了双轴搅拌反应器并对其“三传一反”过程进行了数值研究,深入地揭示了体系反应的多物理场耦合机理,分析了双轴搅拌反应器用于热化学储热的可行性,讨论了体系在双轴搅拌反应器内进行放热反应的特性。结果表明,双轴搅拌反应器改善了体系放热反应的传热传质性能;体系1200 s放热过程的转化率为0.49,峰值放热功率和稳定放热功率分别可以达到5.4 kW和3 kW;通过调节水蒸气分压可以控制体系的反应温区,而较低的初始进口温度不仅可以加快反应进程,还能减少体系的额外预热量;反应器的换热能力会明显影响放热过程进行,特别是在高转速和高填充高度的反应条件下,实际应用中应考虑需求来匹配合适的换热装置。
中图分类号:
吕潇峻, 赵长颖, 闫君. 双轴搅拌反应器内Ca(OH)2/CaO热化学储热体系的放热研究[J]. 化工学报, DOI: 10.11949/0438-1157.20240111.
Xiaojun LV, Changying ZHAO, Jun YAN. Exothermic study of Ca(OH)2/CaO thermochemical heat storage system in biaxial stirred reactor[J]. CIESC Journal, DOI: 10.11949/0438-1157.20240111.
符号 | 几何参数 | 值 |
---|---|---|
d0 | 搅拌轴直径 | 15 mm |
r1 | 底弧1半径 | 47 mm |
r2 | 底弧2半径 | 75 mm |
h0 | 入口大小 | 5 mm |
h1 | 侧边1高度 | 17.5 mm |
h2 | 侧边2高度 | 47.5 mm |
h3 | 出口高度 | 70 mm |
l0 | 出口大小 | 10 mm |
l1 | 上部宽度 | 95 mm |
hb | 叶片宽度 | 10 mm |
lb | 叶片厚度 | 2 mm |
表1 模型的几何结构参数
Table 1 Geometrical parameters of the model
符号 | 几何参数 | 值 |
---|---|---|
d0 | 搅拌轴直径 | 15 mm |
r1 | 底弧1半径 | 47 mm |
r2 | 底弧2半径 | 75 mm |
h0 | 入口大小 | 5 mm |
h1 | 侧边1高度 | 17.5 mm |
h2 | 侧边2高度 | 47.5 mm |
h3 | 出口高度 | 70 mm |
l0 | 出口大小 | 10 mm |
l1 | 上部宽度 | 95 mm |
hb | 叶片宽度 | 10 mm |
lb | 叶片厚度 | 2 mm |
符号 | 物理参数 | 值 |
---|---|---|
Dp | 颗粒粒径 | 100 μm |
A | 指前因子 | 53×103 s-1[ |
E | 活化能 | 83×103 J/mol[ |
R | 气体常数 | 8.314 J/(mol·K) |
ρCa(OH)2 | Ca(OH)2的密度 | 2200 kg/m3[ |
ρCaO | CaO的密度 | 3320 kg/m3[ |
λs | 固体的热导率 | 2 W/(m·K)[ |
cp,Ca(OH)2 | Ca(OH)2的比热容 | f1(T)[ |
cp,CaO | CaO的比热容 | f2(T)[ |
表2 模型的重要物理参数
Table 2 Important physical parameters of the model
符号 | 物理参数 | 值 |
---|---|---|
Dp | 颗粒粒径 | 100 μm |
A | 指前因子 | 53×103 s-1[ |
E | 活化能 | 83×103 J/mol[ |
R | 气体常数 | 8.314 J/(mol·K) |
ρCa(OH)2 | Ca(OH)2的密度 | 2200 kg/m3[ |
ρCaO | CaO的密度 | 3320 kg/m3[ |
λs | 固体的热导率 | 2 W/(m·K)[ |
cp,Ca(OH)2 | Ca(OH)2的比热容 | f1(T)[ |
cp,CaO | CaO的比热容 | f2(T)[ |
符号 | 参数 | 值 |
---|---|---|
uin | 气体入口流速 | 0.5 m/s |
S/N | 水蒸气/氮气比例 | 0.8 |
pout | 初始和出口压力 | 1 bar |
ω | 搅拌转速 | 100 rpm |
T0 | 初始和进口温度 | 623 K |
H | CaO的填充高度 | 20 mm |
h | 壁面换热系数 | 12 W/(m2·K) |
Tf | 外部自由来流温度 | 303 K |
表3 基础工况的参数设置
Table 3 Parameters of the base case
符号 | 参数 | 值 |
---|---|---|
uin | 气体入口流速 | 0.5 m/s |
S/N | 水蒸气/氮气比例 | 0.8 |
pout | 初始和出口压力 | 1 bar |
ω | 搅拌转速 | 100 rpm |
T0 | 初始和进口温度 | 623 K |
H | CaO的填充高度 | 20 mm |
h | 壁面换热系数 | 12 W/(m2·K) |
Tf | 外部自由来流温度 | 303 K |
图10 换热系数对放热过程的影响注:(a) conversion and exothermic power; (b) bed temperature(a)转化率和放热功率;(b)床体温度
Fig.10 Effect of heat transfer coefficient on exothermic process
图16 双轴搅拌反应器与固定床反应器的放热对比注:(a)不同填充高度;(b)不同水蒸气分压
Fig.16 Comparison between biaxial stirred reactor and fixed bed reactor on exothermic process(a) variation of filling height; (b) variation of steam pressure
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