電解鋁工業(yè)生產過程中的余熱回收利用技術研究
發(fā)布時間：2020-12-10 10:11
鋁生產中大約一半的能源未被利用,在這些熱量之中,大約30-45%的總廢熱量被冶煉廠的煙氣帶走,這部分能量是最容易被回收的。冰島東部的Alcoa Fjardaal鋁廠每年生產35萬噸鋁,其煙氣的溫度為110°C,所攜帶的熱量達到88MW。這篇論文專注于鋁生產過程中的余熱回收利用技術,通過Engineering Equation Solver（EES）軟件模擬,建立數(shù)學模型。本文提出了有機朗肯循環(huán)（ORC）系統(tǒng),供熱系統(tǒng)和熱電聯(lián)產（CHP）系統(tǒng)三種方案來回收煙氣中的余熱。在最優(yōu)工況下,ORC系統(tǒng)可發(fā)電2.57MW,其對應的最優(yōu)設計參數(shù)為工質R-123,蒸發(fā)溫度61.22°C,冷凝溫度16.33°C,蒸發(fā)器夾點溫差9.469°C,冷凝器夾點溫差3.501°C。供熱系統(tǒng)如果采用和ORC系統(tǒng)相同的煙氣溫度降,可實現(xiàn)供熱量42.34MW。供熱系統(tǒng)可滿足當?shù)丶泄嵝枨?農業(yè),融雪等工業(yè)應用潛力巨大。熱電聯(lián)產系統(tǒng)更為均衡全面,在最優(yōu)工況下可生產1.156MW的電力和23.55MW的供熱量。在發(fā)電系統(tǒng)中,有機朗肯循環(huán)的效率受到排氣溫度的限制。提高ORC效率的有效措施是提高熱源溫度。電解鋁槽會吸收大量的...
【文章來源】：天津大學天津市 211工程院校 985工程院校 教育部直屬院校
【文章頁數(shù)】：68 頁
【學位級別】：碩士
【文章目錄】：
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
【參考文獻】：
期刊論文
[1]基于多目標函數(shù)的亞臨界有機朗肯循環(huán)的參數(shù)優(yōu)化和性能分析[J]. 吳雙應,易甜甜,肖蘭. 化工學報. 2014(10)
本文編號：2908519
【文章來源】：天津大學天津市 211工程院校 985工程院校 教育部直屬院校
【文章頁數(shù)】：68 頁
【學位級別】：碩士
【文章目錄】：
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
【參考文獻】：
期刊論文
[1]基于多目標函數(shù)的亞臨界有機朗肯循環(huán)的參數(shù)優(yōu)化和性能分析[J]. 吳雙應,易甜甜,肖蘭. 化工學報. 2014(10)
本文編號：2908519
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