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Modeling and Optimal Design of Natural Gas Liquefaction and Regasification Processes : 천연가스 액화 및 재기화 공정의 모형 및 최적 설계

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dc.contributor.advisor한종훈-
dc.contributor.author송기욱-
dc.date.accessioned2017-07-13T08:37:21Z-
dc.date.available2017-07-13T08:37:21Z-
dc.date.issued2014-08-
dc.identifier.other000000021771-
dc.identifier.urihttps://hdl.handle.net/10371/119710-
dc.description학위논문 (박사)-- 서울대학교 대학원 : 화학생물공학부, 2014. 8. 한종훈.-
dc.description.abstractNatural gas is the worlds fastest-growing fossil fuel, favored for electric power and industrial sectors because of its low carbon intensity and reduced emissions. International natural gas trade is expected to double from 1 trillion cubic meter (tcm) in 2010 to 2 tcm in 2030. Liquefied natural gas (LNG) accounts for a growing share of world natural gas. The core of LNG value chain is the phase change of natural gas that makes it feasible for ship transportation to remote regions.
This thesis addresses modeling and optimal design for LNG value chain and it contains two main processes: one is the liquefaction process in the production plant and the other is the regasification process in LNG receiving terminal. These two processes occupy the main parts in the whole in LNG value chain and are worth to be studied in depth.
This thesis has five main parts. First, modeling and simulation of a liquefaction plant is conducted. Second part proposes a simulation-based optimization methodology, taking full advantage of commercial simulator in process design step. The methodology is applied to a case study of double-expander process optimization to prove its performance. A novel process design of natural gas liquefaction using nonflammable refrigerants is developed in the third part. Safety issue for floating LNG drives interest in minimization of hydrocarbon refrigerants. A new N2O-N2O-N2 cascade liquefaction process with nitrous oxide for the pre-cooling and condensation section and nitrogen gas for the sub-cooling section is proposed. Lastly, retrofit design scheme is introduced for boil-off gas handling process in LNG receiving terminal.
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dc.description.tableofcontentsAbstract i
CHAPTER 1 : Introduction 1
1.1. Research motivation 1
1.2. Research objectives 3
1.3. Outline of the thesis 4
CHAPTER 2 : Modeling and Simulation of Liquefaction Cycles [4] 5
2.1. Introduction to LNG processing 5
2.1.1. LNG value chain 5
2.1.2. State of LNG industry 7
2.1.3. Floating LNG 8
2.2. Liquefaction Cycles 9
2.2.1. Vapor compression refrigeration 9
2.2.2. Gas refrigeration system 11
2.2.3. Natural gas liquefaction processes 12
2.3. Modeling and simulation 14
2.3.1. Mathematical modeling 15
2.3.2. Modeling and simulation using Aspen HYSYS® 21
2.3.3. Degree of freedom analysis 24
CHAPTER 3 : Simulation-based optimization methodology for process design with case study of turbine-based liquefaction process 28
3.1. Introduction 28
3.2. Simulation-based optimization framework 30
3.3. Case study of natural gas liquefaction process 35
3.3.1. STEP 1: Base case design 35
3.3.2. STEP 2: Specifying the design variables 35
3.3.3. STEP 3: Optimization formulation 35
3.3.4. STEP 4: Providing additional constraints in the simulator 38
3.3.5. STEP 5: Determining the design space 38
3.3.6. STEP 6: Comprehensive simulation of the design space 40
3.3.7. STEP 7: Process mapping of the design space using empirical modeling 40
3.3.8. STEP 8: Empirical modeling validation 41
3.3.9. STEP 9: Optimization 43
3.4. Comparison with response surface methodology 47
CHAPTER 4 : Natural gas liquefaction process design with nonflammable refrigerants for offshore application 52
4.1. Introduction 52
4.2. Thermodynamic analysis of carbon dioxide and nitrous oxide 54
4.3. Design of N2O-N2O-N2 cascade process 57
4.3.1. Pre-cooling section 59
4.3.2. Condensation section 61
4.3.3. Sub-cooling section 63
4.4. Results and discussion 65
4.5. Case study with a leaner feed gas 69
CHAPTER 5 : Retrofit design of liquefied natural gas regasification process [79] 72
5.1. Introduction 72
5.2. Methodology 77
5.3. Case study 80
5.3.1. Base case design definition 80
5.3.2. Thermodynamic analysis of the base case design 87
5.3.3. Proposal of the retrofitting design for energy saving 89
5.3.4. Optimization of design variables 95
5.3.5. Design variables 97
5.4. Results and discussion 103
5.4.1. Comparison with the base design 103
5.4.2. Sensitivity analysis 108
5.4.3. Profitability of the proposed design 115
CHAPTER 6 : Conclusion and Future Works 117
6.1. Conclusion 117
6.2. Future Works 119
Literature Cited 120
Abstract in Korean (요약) 132
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dc.formatapplication/pdf-
dc.format.extent2280984 bytes-
dc.format.mediumapplication/pdf-
dc.language.isoen-
dc.publisher서울대학교 대학원-
dc.subjectprocess design-
dc.subjectoptimization-
dc.subjectnatural gas-
dc.subjectLNG-
dc.subjectliquefaction plant-
dc.subjectLNG terminal-
dc.subject.ddc660-
dc.titleModeling and Optimal Design of Natural Gas Liquefaction and Regasification Processes-
dc.title.alternative천연가스 액화 및 재기화 공정의 모형 및 최적 설계-
dc.typeThesis-
dc.description.degreeDoctor-
dc.citation.pagesx, 133-
dc.contributor.affiliation공과대학 화학생물공학부-
dc.date.awarded2014-08-
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