本文係探討柴油引擎排氣廢熱回收系統與甲醇蒸氣重組器整合，探討重組器產生之富氫氣體導入直噴式柴油引擎進氣處與 CO2吸收系統結合成密閉式循環柴油引擎的性能及排氣汙染特性。
甲醇蒸氣重組器無法產生氧氣，須外加液態氧氣蒸發提供。研究分為兩部分：在實驗中柴油引擎在不同負載條件作用下，調整甲醇水溶液之進料量來控制富氫氣體的產量。第二部分是將富氫氣體與不同的富氧氣體混合後進入氣缸燃燒。量取氣缸內燃氣壓力-曲柄角數據、排氣流率、與排氣汙染濃度 (NOX, smoke, HC, CO2, and CO) 等，進行制動熱效率、廢熱回收率、熱釋放率及排氣汙染濃度分析，且使用KIVA-3V-RELEASE2為程式主體，藉由修改相關副程式加入詳細化學反應進行數值運算，分析不同富氫氣體比例與不同富氧氣體比例對柴油引擎的影響；並將數值模擬與實驗結果相互比較，進而探討實驗的可靠度。實驗結果顯示：添加富氫氣體當作輔助燃料可減少密閉式循環引擎排放汙染。增加KOH比例會改善密閉式循環引擎的排放汙染，較高的KOH比例則會吸收密閉式循環引擎更多的CO2及廢氣汙染。富氧氣體濃度提升對於CO、HC和smoke有正面的改善效果。

This thesis is to explore the performance and exhaust emission characteristics of a closed cycle diesel engine with hydrogen-rich gas and rich-oxygen by integrating the methanol steam reformer, exhaust gas heat recovery systems, and CO2 absorption system.
Methanol steam reforming method cannot produce oxygen so the system needs to provide liquid oxygen evaporation. The thesis is divided into two phases. In the first phase, experiments are conducted with diesel engine at different loads, and to adjust the input rate of methanol water solution to control the hydrogen-rich gas production. The second phase is to measure the exhaust pollution concentrations (NOX, smoke, HC, CO2, and CO) by changing the amounts of rich-oxygen gas and hydrogen-rich gas. The KOH concentrations for a closed cycle diesel engine is operated under fixed engine speed and various loads. The BTE, heat release rate, and the concentrations of exhaust pollution are then analyzed.
In addition, this study applies KIVA-3V-RELEASE2 adding detailed chemical reaction for numerical computation to analyze the effect of using hydrogen-rich gas reformed from aqueous methanol solution and rich-oxygen gas. Comparison of experimental results with numerical results can confirm the reliability of the experiment.
The experimental results show that using hydrogen-rich gas as an auxiliary fuel can reduce emissions in the CCDE. The emissions from CCDE reduce with increasing KOH ratios. The higher KOH ratios can absorb more CO2 and some emissions from CCDE. The rich-oxygen gas can reduce both HC, CO, and smoke emissions.

[1] T. Ura, T. Obara, “Development of Depth Independent Closed Cycle Diesel Engine for an Autonomous Underwater Vehicle”, Proc, Unmanned Untethered Submersible Tech. pp. 1-9, 1991.
[2] C.T. Shu, H.W. Wu, “Effects of Operating Parameters on Steady and Transient Behaviors of A Closed Cycle Diesel Engine”, Energy Conversion and Management, Vol. 47, pp. 2070-2080, 2006.
[3] F.L. Chen, H.S. Chiu, H.M. Lu, “Hydrogen production and hydrogen storage technology”, Wu-Nan Culture Enterprise, 2007.
[4] C.S. Shih, “Graphic hydrogen”, Shi Mao Publishing Ltd, 2009.
[5] I.S. Kim, J.S. Han, K.S. Choi, “Purifier-integrated methanol reformer for fuel cell vehicles”, J. Power Sources, Vol. 86, pp. 223-227, 2000.
[6] H.W. Wu, J.H. Wang “The effect of auxiliary oxygen enrichment on the combustion performance of a diesel engine” Twentieth combustion Society Seminar, A038, T0103, 2010.
[7] J.H. Wang, “Study of Performance, Noise and Vibration on Closed Cycle Diesel Engines”, Master Thesis, Department of Systems and Naval Mechatronic Engineering, NCKU, 2004.
[8] W.H. Lin, “Analysis of Effect of Artificial Atmosphere on the Performance for a Closed Cycle Diesel Engines”, Master Thesis, Department of Systems and Naval Mechatronic Engineering, NCKU, 2005.
[9] T. Asada, M. Nagai, “Investigations on Recycle and Closed-Cycle Diesel Engines”, SAE, Vol. 800964, pp. 33-52, 1980.
[10] A. Fowler, Thompson, V. Raymond, “Development of a Depth Independent Closed Cycle Diesel Engine”, Proceedings-Annual Offshore Technology Conference, Vol. 4031-4043-MS, 1981.
[11] T. Asada, M. Nagai, “Investigations on Recycle and Closed-Cycle Diesel Engines”, SAE, Vol. 800964, pp. 33-52, 1980.
[12] A. Fowler, “Closed-Cycle Diesel Engine for Underwater Work”, Marine Engineers Review, pp. 26-27, 1983.
[13] I. J. Potter, “Evaluation of the Performance of a Diesel Engine when Operating on Non-Air Mixtures”, Proceedings of the Intersociety Energy Conversion Engineering Conference, published by IEEE pp. 539-544, 1991.
[14] C. T. Shu, H.W. Wu, “Effects of Operating Parameters on Steady and Transient Behaviors of a Closed Cycle Diesel Engine”, Energy Conversion and Management, No. 47, pp. 2070-2080, 2006.
[15] H.W. Wu, J. Y. Yang, R. H. Wang, W.H. Lin, Z. Y. Wu, “Combustion Characteristics of a Closed Cycle Diesel Engine with Different Intake Gas Contents”, Applied Thermal Engineering Vol. 29, pp.848-858, 2009.
[16] S.Y. Chang, “ A Study on the Effect of Hydrogen Added at the Inlet Port on the Operating Performance of Closed Cycle Diesel Engines”, Master Thesis, Department of Systems and Naval Mechatronic Engineering, NCKU, 2012.
[17] H. W. Wu, R. H. Wang, T. Y. Chen, Y. C. Chen, D. J. Ou, “Influence of port-inducted ethanol or gasoline on combustion and emission of a closed cycle diesel engine”, Energy, Vol. 64, pp. 259-267, 2014.
[18] C.P. Grigoropoulos, J.S. Suh, R. Greif, M.T. Lee, “A study of steam methanol reforming in a microreactor ”, J. Power Sources, Vol. 173, pp. 458-466, 2005.
[19] B. Emonts, J. Bøgild Hansen, H. Schmidt, T. Grube, B. Höhlein, R. Peters, A. Tschauder, “Fuel cell drive system with hydrogen generation in test”, J. Power Sources, Vol. 86, pp. 228-236, 2000.
[20] H.M. Lin, “Measurement and numerical simulation of the performance of the auto-thermal type methanol reformer for fuel cells”, Master Thesis, Department of Mechanical Engineering, NCHU, 2004.
[21] A. Tsolakis, Megaritis, “Catalytic exhaust gas fuel reforming for diesel engines-effects of water addition on hydrogen production and fuel conversion efficiency” Int. J. Hydrogen Energy, Vol. 29, pp.1409-1419, 2004.
[22] Y. ZHAO, “Parametric study on methanol reforming to produce hydrogen with exhaust heat recovery of diesel engine”, Master Thesis, Department of Systems and Naval Mechatronic Engineering, NCKU, 2014.
[23] T.T. Hsu, “Investigation on combustion characteristics and emission of a diesel engine running with hydrogen rich gas by methanol reforming with exhaust heat recovery”, Master Thesis, Department of Systems and Naval Mechatronic Engineering, NCKU, 2015.
[24] N. Saravanan, G. Nagarajan, “An experimental investigation of hydrogen-enriched air induction in a diesel engine system”, International Journal of Hydrogen Engery, Vol. 33, pp. 1769-1775, 2008.
[25] E. Conte, K. Boulouchos, “Influence of Hydrogen-Rich-Gas Addition on Combustion, Pollutant Formation and Efficiency of an IC-SI Engine”, SAE paper, 2004.
[26] S.D.Yeh, “The efficiency improvement of motorcycle engine running with reformulated hydrogen rich gas driven by exhaust energy”, Master Thesis, Department of Mechanical Engineering, NCHU, 2011.
[27] T.C. Zannis, E.G. Pariotis, D.T. Hountalas, D.C. Rakopoulos, Y.A. Levendis, Energy Conversion and Management, Vol.48, 19th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, pp. 2962-2970, 2007.
[28] S. Bari, M.M. Esmaeil,“Effect of H 2 /O 2 addition in increasing the thermal efficiency of a diesel engine”, Fuel , Vol. 89, pp. 378–383, 2010.
[29] P. Baskar, A. Senthilkumar, “Effects of oxygen enriched combustion on pollution and performance characteristics of a diesel engine”, Int. J. Engineering Science and Technology, Vol. 19, pp. 438-443, 2016.
[30] J.Y. Jhou, “An experimental study of the performance on reformer of fuel cell and effect of catalyst”, Master Thesis, Department of Mechanical Engineering, NTU, 2005.
[31] Andrzej Go´rak, E.Y. Kenig, L. Kucka, “Kinetics of the Gas-Liquid Reaction between Carbon Dioxide and Ydroxide Ions”, Ind. Eng. Chem, Vol. 41, pp. 5952-5957, 2002.
[32] L.D. Cloutman, Dukowicz J.K., Ramshaw J.D., & Amsden, A.A., “CONCAS-SPRAY: A Computer Code for Reactive Flow with Fuel Sprays,” Los Alamos Scientific Laboratory Report, LA-9294-MS, 1982.
[33] A.A. Amsden, T.D. Butler, P.J. O’Rourke, J.D. Ramshaw, “KIVA-AComprehensive Model for 2-D and 3-D Engine Simulation,” SAE 850554, 1985.
[34] A. A. Amsden, “KIVA-3V, Release 2, Improvments to KIVA-3V,” Los Alamos National Laboratory report LA-13608-MS, May, 1999.
[35] C. Liu, “An Experimental and Analytical Investigation into the Combustion Characteristics of HCCI and Dual Fuel Engines with Pilot Injection”, Ph.D. diss., Dept. of Mechanical and Manufacturing Engineering, Calgary Univ, 2006.
[36] P.C. Pei, Y.F. Liu, “Asymptotic Analysis on Autoignition and Explosion Limits of Hydrogen-Oxygen Mixtures in Homogeneous Systems”, International Journal of Hydrogen Energy Vol. 31, pp. 639-647, 2006.
[37] K. Seshadri, N. Peters and G. Paczko, “Rate-ratio asymptotic analysis of autoignition of n-heptane in laminar non-premixed flows”, Comb. & Flame Vol. 146, pp. 131-141, 2006.
[38] S. Liu, J.C. Hewson, J.H. Chen, “Nonpremixed n-heptane autoignition in unsteady counterflow”, Combustion and Flame Vol. 145, pp. 730-739, 2006.
[39] United States Environmental Protection Agency, U.S. EPA, http://www.epa.gov/pm/.
[40] Vehicle Energy Laboratory, Kun Shan University, http://ksuvel.myweb.hinet.net/index-1.htm
[41] S.Y. Zeng, “Study on the effect of added ammonia on hydrogen production by water electrolysis”, Master Thesis, Department of Systems and Naval Mechatronic Engineering, NCKU, 2011.
[42] F.E Obert, Internal Combustion Engines and Air Pollution, Index Education Publishers, New York, Chap 2, 1973.
[43] F. Cruz-Peragón, F.J. Jiménez-Espadafor, J.A. Palomar, M.P. Dorado, “Influence of a combustion parametric model on the cyclic angular speed of internal combustion engines. Part I: setup for sensitivity analysis”, Energy & Fuels, Vol. 23, pp. 2921-2929, 2009.
[44] T. Shudo, H. Suzuki, “Applicability of heat transfer equations to hydrogen combustion”, JSAE Rev., Vol. 23, pp. 303–308, 2002.
[45] A.T. Kirkpatrick, C.R. Ferguson, Internal Combustion Engine Fundamentals: Applied Thermoscience, John Wiley & Sons, Inc., New York, pp. 39-54, 2001.
[46] D. Anderton, P.E. Waters, “Effect of Fuel Composition on Diesel Engine Noise and Performance”, SAE Technical Paper 820235, 1982.
[47] S. Henningsen, “Hydrocarbon Emissions from the Ignition-Delay
Period in a Direct-Ignition Diesel Engine”, SAE Technical Paper 841381, 1984.