Energy and exergy analysis of waste incinerator power cycle using cold energy recovery of liquefied natural gas and using the resulting natural gas as additional fuel for the waste incinerator.

Number of pages: 109 File Format: word File Code: 32295
Year: 2009 University Degree: Master's degree Category: Facilities - Mechanics
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  • Summary of Energy and exergy analysis of waste incinerator power cycle using cold energy recovery of liquefied natural gas and using the resulting natural gas as additional fuel for the waste incinerator.

    Dissertation

    To receive a Master's degree

    in the field of Mechanical Engineering-Energy Conversion

    Abstract

    The objectives of this project include providing a solution for calculating the calorific value of waste based on the knowledge of the composition of waste and also proposing a combined cycle of waste incineration power generation with The use of cold energy recovery of liquefied natural gas is combined with the use of the resulting natural gas as additional fuel for the waste incinerator and performing parameter analysis in order to investigate the effects of key parameters on energy efficiency and exergy. The combined cycle consists of a Rankine cycle of ammonia solution, which is combined with a waste incinerator and a cold energy cycle of liquefied natural gas. This combined cycle is compared with the conventional steam Rankine cycle. The goal is to find points with higher efficiencies than the common cycle, and these points can be found through the drawn diagrams. In the combined cycle, the ammonia solution distillation temperature and the input and output pressures of turbine #2 are considered as key parameters. By reducing the distillation temperature of ammonia solution, both energy and exergy efficiencies increase. The energy and exergy efficiencies increase with the increase in the inlet pressure of turbine #2. As the output pressure of turbine #2 increases, the energy efficiency of the combined cycle decreases while the exergy efficiency increases.

    Key words: cogeneration of work and heat, ammonia solution cycle, LNG cycle, waste incinerator, energy efficiency, exergy efficiency

    Chapter 1: Introduction to energy and exergy analysis

     

     

     

    Introduction

    Exergy analysis is a thermodynamic analysis method that is based on the second law of thermodynamics and provides a very meaningful and logical secondary method for evaluating and comparing processes and systems. In particular, exergy analysis leads to the presentation of efficiencies that provide a correct measure of how the actual performance approaches the ideal performance, and also expresses the reasons and locations of thermodynamic drops much more clearly than the energy analysis. Therefore, exergy analysis can help to improve and optimize designers.

    In recent years, we have seen an increase in the use and understanding of the usefulness of exergy analysis by industrialists, governments, and academics. Also, the method of exergy analysis is rapidly becoming global, and it is hoped that by using this method, the available energy resources will be utilized to the maximum. pays Common thermodynamic analysis is based on the first law of thermodynamics, which states the law of conservation of energy. Energy analysis of an energy conversion system is basically an estimate of the input and output energies of the system. The energy output from the system is broken into two parts, products and losses. Efficiencies are often measured as ratios of energy quantities, and are often used to evaluate and compare different systems. For example, power plants, heaters and refrigerators are often compared based on energy efficiency or energy desirability scales.

    However, energy efficiency is often misleading. Because they do not always provide a measure of how close the system performance is to the system's ideal state performance. In addition, the thermodynamic losses that occur within a system (that is, the factors that cause the deviation of the system's performance from the ideal state), are often not correctly determined and evaluated along with energy analysis. The results of energy analysis can show that there are major inefficiencies in the wrong parts of the system and also the expression of technological efficiency is different from what actually exists. Exergy analysis eliminates many of the defects of energy analysis.Exergy analysis is based on the second law of thermodynamics and is very useful for determining the causes, location and magnitude of process inefficiencies. Exergy in a certain amount of energy is actually a small estimate of the usefulness of that energy, or in other words, the quality of that energy. Exergy analysis acknowledges that although energy cannot be produced or destroyed, its quality can be reduced and eventually it can reach a state where it is in complete equilibrium with the environment and therefore will not be able to do work.

    For example, in the case of energy storage systems, by using exergy analysis we are able to determine the maximum potential of the energy input to the system. Only if the energy undergoes reversible processes, this maximum potential will be preserved and recoverable. In the real world and due to the permanent irreversibility of the processes, we will face losses when recovering this potential.

    The exergy flow of a flowing substance is the maximum time when the resulting work is obtained when the process reaches the state of the environment in a reversible way and the exchange of mass and heat only takes place with the environment. Basically, exergy analysis states that the theoretical limitations that exist in the system clearly indicate that no real system can maintain all exergy and only a part of the exergy input to the system can be recovered. Also, exergy analysis quantitatively specifies practical limitations by presenting losses as a direct measure of exergy losses. is also used. Exergy consumption is often irreversibility, wasted work, wastage, etc. is called The nomenclature of exergy terms is consistent with the nomenclature of standard exergy analysis by Katas [1] and his colleagues in 1987 [1].

  • Contents & References of Energy and exergy analysis of waste incinerator power cycle using cold energy recovery of liquefied natural gas and using the resulting natural gas as additional fuel for the waste incinerator.

    List:

    Chapter 1: Introduction to energy and exergy analysis. 9

    Introduction. 9

    1-1 Why energy and exergy analysis? 10

    1-2) Mass, energy and entropy balance. 12

    1-3)   Exact balance equations. 13

    1-4)  Exergy of closed system. 16

    1-5) Exergy of flows 17

    1-5-1) Exergy of flow of a material 17

    1-5-2) Exergy of thermal energy. 18

    1-5-3) work exergy 19

    1-5-4) electrical exergy. 20

    1-6)  Exergy loss. 20

    1-7)  Exergy balance. 21

    1-8)   Environment of reference. 22

    1-8-1) Specifications of the reference environment theory. 22

    1-8-2) reference environment models. 23

    1-9) Efficiency and other important scales. 24

    1-10) Energy and exergy analysis process. 27

    1-11) Energy and exergy properties. 27

    1-12) Concepts of exergy analysis results. 28

    Chapter 2: Introduction to simultaneous production of work and heat. 30

    Introduction. 30

    2-1) Types of general applications of simultaneous production. 32

    2-2)   Types of simultaneous production systems. 32

    2-2-1) upper cycle. 32

    2-2-2) Lower cycle. 33

    2-3)   Advantages of using simultaneous production. 33

    2-4)  Simultaneous production methods. 34

    2-5)   Cogeneration power plant efficiency. 35

    2-6)  The ratio of power to heat of a set. 37

    2-7) Analysis of power to heat ratio of a set. 37

    Chapter 3: Waste incinerators and basic calculations related to energy recovery from waste. 40

    Introduction. 40

    3-1) Types of waste incinerators 42

    3-1-1) Waste incinerator with a mobile firebox. 42

    3-1-2) Garbage incinerator with fixed hearth. 42

    3-1-3) Garbage incinerator with rotating incinerator 43

    3-1-4) Garbage incinerator with fluid bed. 43

    3-2) Heat of combustion. 44

    3-3)) calorific value. 44

    3-4) Basic calculations related to energy recovery from waste. 47

    3-5) Providing a computer program to calculate the calorific value of waste. 52

    Chapter 4: Introduction to liquefied natural gas. 60

    Introduction. 60

    4-1) Is LNG a competitive resource with natural gas? 62

    4-2) A brief history of LNG. 63

    4-3) Combinations of natural gas and LNG. 65

    4-4) LNG value chain. 67

    4-5) Is LNG a safe fuel? 70

    4-6) Use of LNG cold energy. 71

    4-7) Scientific terms of other fuels. 75

    4-7-1) LNG compounds. 75

    4-7-2) Natural gas condensate compounds. 75

    4-7-3) LPG compounds. 76

    Chapter 5: Energy and exergy analysis of the waste incinerator power cycle using cold energy recovery of liquefied natural gas along with the use of the resulting natural gas as additional fuel for the waste incinerator. 78

    Introduction. 78

    5-1) Brief about HYSIS software. 80

    5-2) Thermal energy analysis. 81

    5-3) Exergy analysis. 81

    5-4)) Description of common power cycle using waste incinerator 82

    5-4-1) Brief about waste incinerator 84

    5-4-2) How to convert waste incinerator into a heat exchanger. 85

    5-5)) Description of combined power cycle using waste incinerator with LNG cold energy recovery. 87

    5-6) Description of combined power cycle using waste incinerator along with LNG cold energy recovery and using produced city gas as additional fuel in waste incinerator 92

    5-6-1) Energy balance equations. 93

    5-6-1-1) Waste incinerator 93

    5-6-1-2) Heat exchanger No. 1. 93

    5-6-1-3) Turbine No. 1. 93

    5-6-1-4) Turbine No. 2. 93

    5-6-1-5) Heat exchanger No. 2. 93

    5-6-1-6) Pump No. 1. 93

    5-6-1-7) Pump No. 2. 94

    5-6-1-8) Municipal gas. 94

    5-6-1-9) overall energy balance. 94

    5-6-1-10) Energy efficiency. 94

    5-6-2) Exergy balance equations. 94

    5-6-2-1) Exergy of air 94

    5-6-2-2) Exergy of ammonia mixture. 95

    5-6-2-3) Exergy input to the cycle. 95

    5-6-2-4) Exergy output from the cycle. 95

    5-6-2-5) Overall exergy balance. 95

    5-6-2-6) exergy efficiency. 95

    5-7) Sensitivity analysis. 102

    5-7-1) Analysis of exergy and energy graphs in the state of flow temperature change number 1. 104

    5-7-2) Analysis of exergy and energy graphs in the state104

    5-7-2) Analysis of exergy and energy diagrams in the state of flow pressure change No. 7. 106

    5-7-3) Analysis of exergy and energy diagrams in the state of flow pressure change No. 8. 108

    Chapter 6: Conclusion. 109

    6-1) Suggestions 110

     

    Source:

     

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    [16] INTRODUCTION TO LNG; Institute for Energy, Law & Enterprise, University of Houston Law Center

    [17] Ogawa K. Outline of political consideration of waste to power generation in Japan in comparison with the situation in Europe and America. J Japan Inst Egy 1998; 77(854):460–71.

    [18] Miyazaki T, Akisawa A, Kashiwagi T. LNG cold energy cycle. Proc. JSRAE, 1998:157–160.

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Energy and exergy analysis of waste incinerator power cycle using cold energy recovery of liquefied natural gas and using the resulting natural gas as additional fuel for the waste incinerator.