重整气与柴油混合燃料斯特林发动机燃烧室的传热与燃烧试验研究

Title: Experimental Investigation on Heat Transfer and Combustion of a Stirling Engine Combustor Fueled by Reformed Gas and Diesel Fuel

题目：重整气与柴油混合燃料斯特林发动机燃烧室的传热与燃烧试验研究

Authors: LAN Jian, ZHAO Yanchun, LIN Guangtao, LI Yelin, REN Zhe, LYU Tian, SHEN Mengmeng, GU Genxiang, HAN Dong

作者：兰健，赵燕春，林广涛，李烨霖，任哲，吕田，沈梦梦，顾根香，韩东

单位：上海交通大学动力机械与工程教育部重点实验室，中国船舶集团有限公司第七一一研究所

Journal of Thermal Science, 2024, 33(5): 1907-1919.

Experimental Investigation on Heat Transfer and Combustion of a Stirling Engine Combustor Fueled by Reformed Gas and Diesel Fuel.pdf

Abstract: Thermochemical recuperation heat recovery is an advanced waste heat utilization technology that can effectively recover exhaust waste heat from oxy-fuel Stirling engines. The novel combustor of a Stirling engine with thermochemical recuperation heat recovery system is expected to utilize both reformed gas and diesel fuels as sources of combustion. In this research, the effects of various factors, including the H2O addition, fuel distribution ratio (FDR), excess oxygen coefficient, and cyclone structure on the temperature distribution in the combustor, combustion emissions, and external combustion system efficiency of the Stirling engine were experimentally investigated. With the increase of steam-to-carbon ratio (S/C), the temperature difference between the upper and lower heating tubes reduces and the circumferential temperature fluctuation decreases, and the combustion of diesel and reformed gas remains close to complete combustion. At S/C=2, the external combustion efficiency is 80.6%, indicating a 1.6% decrease compared to conventional combustion. With the increase of FDR, the temperature uniformity of the heater tube is improved, and the CO and HC emissions decrease. However, the impact of the FDR on the maximum temperature difference and temperature fluctuation across the heater is insignificant. When the FDR rises from 21% to 38%, the external combustion efficiency increases from 87.4% to 92.3%. The excess oxygen coefficient plays a secondary role in influencing temperature uniformity and temperature difference, and the reformed gas and diesel fuel can be burned efficiently at a low excess oxygen coefficient of 1.04. With an increase in the cyclone angle, the heater tube temperature increases, while the maximum temperature difference at the lower part decreases, and the temperature fluctuation increases. Simultaneously, the CO and HC emissions increase, and the external combustion efficiency experiences a decrease. A cyclone angle of 30° is found to be an appropriate value for achieving optimal mixing between reformed gas and diesel fuel. The research findings present valuable new insights that can be utilized to enhance the performance optimization of Stirling engines.

摘要：热化学余热回收是一种先进的余热利用技术，能有效回收斯特林发动机纯氧燃烧的排气余热。带有热化学回收热系统的新型斯特林发动机燃烧器需要能同时利用柴油重整气和柴油作为燃料。本文实验研究了水的添加量、燃料分配比 、过量氧气系数和旋流器结构对斯特林发动机燃烧室性能的影响。研究表明，随着水碳比的增加，加热管轴向温差减小，周向温度波动减小，当 S/C=2 时，斯特林发动机外燃系统的效率为 80.6%，与传统外燃系统相比效率降低了 1.6%。随着燃料分配比的增加，加热器管的温度均匀性得到改善，CO 和 HC 排放量减少。燃料分配比对整个加热器的最大温差和温度波动的影响并不明显。当燃料分配比从 21% 上升到 38% 时，外燃系统效率从 87.4% 上升到 92.3%。过量氧气系数对温度均匀性和温差的影响较小，过量氧气系数为 1.04 的条件下，重整气和柴油混合燃料依旧可以高效燃烧。随着旋流器角度的增大，加热管的温度升高，而下端的最大温差减小、温度波动增大、CO 和 HC 排放量增加，外燃系统效率降低。旋流器角度30°是实现重整燃气与柴油混合燃烧最佳值。

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