电解铝工业生产过程中的余热回收利用技术研究
发布时间：2020-12-10 10:11
铝生产中大约一半的能源未被利用,在这些热量之中,大约30-45%的总废热量被冶炼厂的烟气带走,这部分能量是最容易被回收的。冰岛东部的Alcoa Fjardaal铝厂每年生产35万吨铝,其烟气的温度为110°C,所携带的热量达到88MW。这篇论文专注于铝生产过程中的余热回收利用技术,通过Engineering Equation Solver（EES）软件模拟,建立数学模型。本文提出了有机朗肯循环（ORC）系统,供热系统和热电联产（CHP）系统三种方案来回收烟气中的余热。在最优工况下,ORC系统可发电2.57MW,其对应的最优设计参数为工质R-123,蒸发温度61.22°C,冷凝温度16.33°C,蒸发器夹点温差9.469°C,冷凝器夹点温差3.501°C。供热系统如果采用和ORC系统相同的烟气温度降,可实现供热量42.34MW。供热系统可满足当地集中供热需求,农业,融雪等工业应用潜力巨大。热电联产系统更为均衡全面,在最优工况下可生产1.156MW的电力和23.55MW的供热量。在发电系统中,有机朗肯循环的效率受到排气温度的限制。提高ORC效率的有效措施是提高热源温度。电解铝槽会吸收大量的...
【文章来源】：天津大学天津市 211工程院校 985工程院校 教育部直属院校
【文章页数】：68 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Nomenclature
Chapter 1 Introduction
1.1 Main concerns of the study
1.2 An overview of the present work
Chapter 2 Survey of Background Literature
2.1 Energy and environment in Iceland
2.1.1 Geothermal resource
2.1.2 Electricity production
2.1.3 Power-intensive industries in Iceland
2.1.4 Space heating
2.2 Low-temperature energy
2.3 Power generation technologies
2.3.1 Organic Rankine cycle
2.3.2 Kalina cycle
2.3.3 Thermoelectric generator（TEG）
2.4 Direct utilization
2.4.1 District heating
2.4.2 Snow melting
2.4.3 Agriculture applications
2.4.4 Fish farming
2.4.5 Drying and dehydration industrial
Chapter 3 Alcoa Aluminum Smelter
3.1 Aluminum production
3.1.1 Bayer Process
3.1.2 Hall-Héroult Process
3.2 Energy balance of an aluminum reduction cell
3.3 Cell emissions
3.4 Heat recovery potential of exhaust gas
3.5 Alcoa Fjardaal aluminum plant
3.5.1 Thermal energy content
3.5.2 Local energy demand
3.5.3 Dew point temperature
Chapter 4 Heat Recovery System
4.1 Scenarios
4.2 Assumptions
4.3 Models
4.4 Optimization of ORC
4.4.1 Objective function
4.4.2 Design variables
4.4.3 Flowchart
4.5 Conditions of Alcoa smelter
4.5.1 Heat source condition
4.5.2 Ambient condition
4.5.3 Heat transfer coefficient and pressure drop
4.5.4 Equipment conditions
4.5.5 Heating system conditions
4.6 Result
4.6.1 Power generation system
4.6.2 Heat supply system
4.6.3 CHP system
4.7 Summary
Chapter 5 Power Generation with Enhanced Heat Source
5.1 Setting dilution air flow rate
5.2 Heat balance influence
5.3 The optimal working performance of ORC in various conditions
5.4 The optimal design variables in different conditions
5.5 Summary
Chapter 6 Conclusion and Future Work
6.1 Conclusion
6.2 Recommendation for the further research
References
Publication
Acknowledgement
【参考文献】：
期刊论文
[1]基于多目标函数的亚临界有机朗肯循环的参数优化和性能分析[J]. 吴双应,易甜甜,肖兰. 化工学报. 2014(10)
本文编号：2908519
【文章来源】：天津大学天津市 211工程院校 985工程院校 教育部直属院校
【文章页数】：68 页
【学位级别】：硕士
【文章目录】：
摘要
Abstract
Nomenclature
Chapter 1 Introduction
1.1 Main concerns of the study
1.2 An overview of the present work
Chapter 2 Survey of Background Literature
2.1 Energy and environment in Iceland
2.1.1 Geothermal resource
2.1.2 Electricity production
2.1.3 Power-intensive industries in Iceland
2.1.4 Space heating
2.2 Low-temperature energy
2.3 Power generation technologies
2.3.1 Organic Rankine cycle
2.3.2 Kalina cycle
2.3.3 Thermoelectric generator（TEG）
2.4 Direct utilization
2.4.1 District heating
2.4.2 Snow melting
2.4.3 Agriculture applications
2.4.4 Fish farming
2.4.5 Drying and dehydration industrial
Chapter 3 Alcoa Aluminum Smelter
3.1 Aluminum production
3.1.1 Bayer Process
3.1.2 Hall-Héroult Process
3.2 Energy balance of an aluminum reduction cell
3.3 Cell emissions
3.4 Heat recovery potential of exhaust gas
3.5 Alcoa Fjardaal aluminum plant
3.5.1 Thermal energy content
3.5.2 Local energy demand
3.5.3 Dew point temperature
Chapter 4 Heat Recovery System
4.1 Scenarios
4.2 Assumptions
4.3 Models
4.4 Optimization of ORC
4.4.1 Objective function
4.4.2 Design variables
4.4.3 Flowchart
4.5 Conditions of Alcoa smelter
4.5.1 Heat source condition
4.5.2 Ambient condition
4.5.3 Heat transfer coefficient and pressure drop
4.5.4 Equipment conditions
4.5.5 Heating system conditions
4.6 Result
4.6.1 Power generation system
4.6.2 Heat supply system
4.6.3 CHP system
4.7 Summary
Chapter 5 Power Generation with Enhanced Heat Source
5.1 Setting dilution air flow rate
5.2 Heat balance influence
5.3 The optimal working performance of ORC in various conditions
5.4 The optimal design variables in different conditions
5.5 Summary
Chapter 6 Conclusion and Future Work
6.1 Conclusion
6.2 Recommendation for the further research
References
Publication
Acknowledgement
【参考文献】：
期刊论文
[1]基于多目标函数的亚临界有机朗肯循环的参数优化和性能分析[J]. 吴双应,易甜甜,肖兰. 化工学报. 2014(10)
本文编号：2908519
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