LNG气化温度对船用天然气/柴油双燃料发动机燃烧排放的影响

推进技术 ›› 2015, Vol. 36 ›› Issue (9): 1369-1375.

LNG气化温度对船用天然气/柴油双燃料发动机燃烧排放的影响

于洪亮^1,2,段树林¹,孙培廷¹

大连海事大学轮机工程学院，辽宁大连 116026; 大连海洋大学航海与船舶工程学院，辽宁大连 116023,大连海事大学轮机工程学院，辽宁大连 116026,大连海事大学轮机工程学院，辽宁大连 116026

发布日期:2021-08-15
作者简介:于洪亮(1984—)，男，博士生，讲师，研究领域为发动机燃烧与排放，船舶代用燃料。

Effects of LNG Gasification Temperature on Combustion and Emission Characteristics of Marine Dual Fuel Engines

Marine Engineering College，Dalian Maritime University，Dalian 116026，China; Navigation and Naval Architecture College，Dalian Ocean University，Dalian 116023，China,Marine Engineering College，Dalian Maritime University，Dalian 116026，China and Marine Engineering College，Dalian Maritime University，Dalian 116026，China

Published:2021-08-15

摘要/Abstract

摘要： 为了获得液化天然气(LNG)气化温度对船用天然气/柴油双燃料发动机性能的影响规律，简述了船用天然气/柴油双燃料发动机CH4排放过高的原因与措施，对双燃料发动机按推进特性在25%，50%，75%，100%负荷下燃用20oC气化温度下的LNG进行了试验，获得了数值模拟的初始条件及排放数据，并通过数值模拟的方法就不同LNG气化温度对发动机缸内湍流强度，近壁温度，燃烧过程，以及排放产物的影响进行了研究。结果显示，试验测量的压力及排放数据与对应的数值模拟结果较为一致。LNG气化温度降低，引起缸内平均湍流动能峰值上升，近壁区域的对流换热系数增大，近壁温度升高，改善了燃烧效果，有利于降低CH4和CO₂的排放，同时NO降低22%，碳烟排放量降低67%。

关键词: LNG气化温度；船用双燃料发动机；近壁温度；燃烧排放

Abstract: In order to obtain the performance of marine natural gas/diesel dual fuel engine on different liquefied natural gas(LNG) gasification temperature，the reasons and measures of the high CH4 emission of marine dual fuel engines had been presented. According propulsion characteristic，the experiment measured original engine operating data and emission data at 25%，50%，75% and 100% load under 20oC of LNG gasification temperature. Numerical simulation method had been adopted to analyze the effects of different LNG gasification temperature on the cylinder turbulence intensity，near-wall temperature，combustive process and emission of the engine. The results show that numerical simulation results are consistent with the tested pressure and emission data，the decreased LNG gasification temperature reduces the CH4 and CO₂ emissions，increases the peak of mean cylinder turbulence kinetic energy，heat transfer coefficient and temperature of the near-wall，improves combustion，also NO emission reduces 22%，Soot emission reduces 67%.

Key words: LNG gasification temperature；Marine dual fuel engines；Near-wall temperature；Combustion and emission

于洪亮,段树林,孙培廷. LNG气化温度对船用天然气/柴油双燃料发动机燃烧排放的影响[J]. 推进技术, 2015, 36(9): 1369-1375.

YU Hong-liang^1,2,DUAN Shu-lin¹,SUN Pei-ting¹. Effects of LNG Gasification Temperature on Combustion and Emission Characteristics of Marine Dual Fuel Engines[J]. Journal of Propulsion Technology, 2015, 36(9): 1369-1375.

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