臺灣博碩士論文加值系統

本論文在台中台糖養豬場測試小型30kW沼氣發電機，收集資料以供長時間沼氣發電使用。本論文分為三大部分，第一部分，使用73%甲烷濃度的沼氣，測試在不同沼氣供給量與不同過剩空氣比時的發電狀況;第二部分，將此結果與計畫第一年的60%甲烷濃度實驗數據比較，觀察不同甲烷濃度(60%與73%)對發電效能之影響。第三部分，利用廢熱回收系統加熱進氣，測試不同進氣溫度對沼氣發電的影響。實驗結果顯示，使用目前73%之甲烷濃度沼氣，在沼氣供給量為260L/min時，引擎最佳發電量為26.7kW；在沼氣供給量為200L/min時擁有最佳熱效率27%和最佳甲烷使用率96.03%。提升甲烷濃度，發電功率隨著甲烷濃度提升而提升，除了當過剩空氣比λ<0.85時。對熱效能而言，在燃料量較稀的狀況下(λ>0.95)可讓熱效能提升；但在燃料量較濃的狀況下(λ＜0.95)，提升甲烷濃度對熱效能沒有好的影響。提升近氣溫度，在過剩空氣比約大於1.3後有較明顯的影響。

This research used a 30kW-generator in Taiwan Sugar swine farm in Taichung to collect data for the long-term electricity generation. This study is an continous effort of Lin’s work [3], which carried out the electricity generation project by using 60% methane concentration of biogas in a small swine farm in Miaoli. This experimental study, using 73% methane concentration of biogas, consisted of three parts. Firstly, investigate the effect of biogas supply rate together with the different excess air ratios on generator performance. Secondly, make a comparison with Lin’s results. Finally, apply a waste heat recovery system to preheat the inlet gas under different temperatures and analyze the preheating influence on the generator performance.
In the present study, the maximum power generation is 26.7kW occurred at biogas flow rate of 260L/min, whereas the maximum thermal efficiency and methane consumption ratio are 27% and 96.03% at biogas flow rate of 200L/min. The power generation in the present work is higher than one in Lin’s one [3], except the region around λ (excess air ratio) &lt; 0.85. However, the thermal efficiency increases with the increasing methane concentration just in the region of λ>0.95, while on the relatively rich side (λ&lt;0.95), there is no benefit. The improvement by preheating inlet gas is obvious when excess air ratio is relatively high, such as λ>1.3.

ABSTRACT(Chinese) i
ABSTRACT(English) ii
Acknowledgements iv
Contents v
LIST OF TABLE viii
LIST OF FIGURES x
Chapter 1 1
Introduction 1
1.1 Motivation and Background: 1
1.2 Literature Review 5
1.3 Scope of Present Study 14
Chapter 2 16
Biogas System in Swine Farm 16
2.1 Swine Manure Management 16
2.2 Three-step Piggery Wastewater Treatment (TPWT) 16
2.2.1 Solid-liquid Separation 17
2.2.2 Anaerobic Treatment 17
2.2.3 Aerobic Treatment 18
2.3 Utilization of Biogas 19
2.4 Engines 21
2.4.1 Four-stroke Gas Engine and Diesel Engine 21
2.4.2 Stirling Engine 22
2.4.3 Gas Turbine 22
2.4.4 Micro Gas Turbine 23
2.4.5 Fuel Cell 23
Chapter 3 25
Experimental Apparatus and Procedures 25
3.1 Experiment layout 25
3.1.1 Engine 25
3.1.2 Air Flow Meter (VA-400) 26
3.1.3 Biogas Flow Meter (TF-4000) 27
3.1.4 Thermocouple 27
3.1.5 Gas Analyzer (HM5000) 28
3.1.6 Methane Concentration Analyzer 28
3.1.7 Heat Exchanger 28
3.1.8 Data Acquisition 28
3.1.9 Temperature Monitor 29
3.1.10 Humidity Temperature Meter (Center 311) 29
3.2 The Theoretical Calculation 30
3.3 The Effect of Methane Concentration 33
3.4 The Effect of Intake Gases Temperature 34
Chapter 4 36
Results and Discussion 36
4.1 Effect of Excess Air Ratio (λ) 36
4.2 Effect of Methane Concentration 46
4.3 Effect of Inlet Gas Temperature 51
4.4 Comparison with Other Researches 55
Chapter 5 57
Conclusions and Recommendations 57
5.1 Conclusions 57
References 59

[1] Falin Chen, Shyi-Min Lu , Eric Wang, Kuo-Tung Tseng, “Renewable energy in Taiwan”, Renewable and Sustainable Energy Reviews,14 ,2029–2038,2010
[2] S. Rasi_, A. Veijanen, J. Rintala, “Trace compounds of biogas from different biogas production plants”, Energy,32,pp. 1375–1380 ,2007
[3] Wei-Tsung Lin, “A Research for Electricity Generation by Using Biogas from Swine Manure for a Farm Power Requirement”, June 2010
[4] Wen-Tien Tsai, Che-I Lin, “Overview analysis of bioenergy from livestock manure management in Taiwan”, Renewable and Sustainable Energy Reviews, 13, pp. 2682-2688, 2009.
[5] Jung-Jeng Su, Bee-Yang Liu, Yuan-Chie Chang, “Emission of greenhouse gas from livestock waste and wastewater treatment in Taiwan”, Agriculture Ecosystems and Environment, 95, pp. 253-263, 2003.
[6] Shang-Shyng Yang, Chung-Ming Liu, Yen-Lan Liu, “Estimation of methane and nitrous oxide emission from animal production sector in Taiwan during 1990–2000”, Chemosphere, 52, pp. 1381-1388, 2003.
[7] Suiful Bari, “Effect of carbon dioxide on the performance of biogas/diesel dual-fuel engine”,WREC,1996
[8] Phan Minh Duc , Kanit Wattanavichien, “Study on biogas premixed charge diesel dual fuelled engine”, Energy Conversion and Management, 48, pp. 2286–2308,2007

[9] N. Tippayawong, A. Promwungkwa, P. Rerkkriangkrai, “Long-term operation of a small biogas/diesel dual-fuel engine for on-farm electricity generation”, Biosystems Engineering, 98, pp. 26-32, 2007.
[10] F. N. Alasfour, “Nox emission from a spark ignition engine using 30% iso-butanol–gasoline blend: part 1–preheating inlet air”, Applied Thermal Engineering ,18, pp. 245–256, 1998
[11] E. Porpatham, A. Ramesh , B. Nagalingam, “Investigation on the effect of concentration of methane in biogas when used as a fuel for a spark ignition engine”, Fuel, 87, pp.1651–1659, 2008
[12] Pal Borjesson, Maria Berglund, “Environmental systems analysis of biogas systems—Part I: Fuel-cycle emissions”, Biomass and Bioenergy, 30, pp. 469-485, 2006.
[13] G.H. Abd-Alia, H.A. Soliman, O.A. Badr, M.F. Abd-Rabbo, “Effect of diluents admissions and intake air temperature in exhaust gas recirculation on the emissions of an indirect injection dual engine”,Energy Conversion and Management,42,pp.1033-1045,2001
[14] Konstantinos P. Tsagarakis, “Optimal number of energy generators for biogas utilization in wastewater treatment facility”, Energy Conversion and Management, 48 ,pp. 2694–2698,2007
[15] Semin, Abdul Rahim Ismail, Rosli Abu Bakar, “Effect of Diesel Engine Converted to Sequential Port Injection Compressed Natural Gas Engine on the Cylinder Pressure vs Crank Angle in Variation Engine Speeds”, American J. of Engineering and Applied Sciences 2 (1):154-159, 2009.
[16] A.J. Torregrosa , P. Olmeda, J. Martin, B. Degraeuwe, “Experiments on the influence of inlet charge and coolant temperature on performance and emissions of a DI Diesel engine”, Experimental Thermal and Fluid Science, 30, pp. 633-641, 2006.
[17] Paola Helena Barros Zarante , Jose Ricardo Sodre, “Evaluating carbon emissions reduction by use of natural gas as engine fuel”, Journal of Natural Gas Science and Engineering,1, pp. 216-220, 2009
[18] Bui Van Ga-Le Minh Tien, Truong Le Bich Tram,Tran Hau Luong, “Biogas-Gasoline hybrid Engine’’, Da Nang University,2008
[19] Haeng Muk Cho,Bang-Quan He,“Spark ignition natural gas engines—A review”,48,pp.608-618,2007
[20] Jindang Huang, R.J.Crookes, “Assessment of simulated biogas as a fuel for the spark ignition engine”,77,pp.1793-1801,1998
[21] S. Swami Nathan, J.M. Mallikarjuna, A. Ramesh, “Effects of charge temperature and exhaust gas re-circulation on combustion and emission characteristics of an acetylene fuelled HCCI engine”,89,pp.515-521,2010
[22] O. Badr, N. Alsayed and M. Manaf, “A parametric study on the lean misfiring and knocking limits of gas-fueled spark ignition engines”,18,pp.579-594,1998
[23] G.Sridhar, P.J. Pual, H.S. Mukunda, “Biomass derived producer gas as a reciprocating engine fuel – an experimental analysis”,21,pp.61-72,2001
[24] C.Tricase, M, Lombardi, “State of the art and prospects of Italian biogas production from animal sewage: Technical-economic considerations”,34,pp.477-485,2009
[25] Chung, Y.C., K.L. Ho, C.P. Tseng, “ Two-stage biofilter for effective NH3 removal from waste gases containing high concentrations of H2S”, J. Air Waste Manag. Assoc. 57: 337-347,2007
[26] Development of Rene wable Energy Sources in Germany 2009, Federal Ministry for the Environment, Nature Conservation and Nuclear Safty, 2009
[27] Arthur H. Lefebvre, “Gas Turbine Combustion”, Hemisphere publishing corporation, 1983