内河公务船测量多台柴油机总油耗的油路系统研究

为了加强公务船艇的燃油消耗管理,需要研究一种可精确测量多台柴油机总油耗的油路系统。该油路系统包括流量计、回油调节器、油路冷却装置、柴油机供油管路和柴油机回油管路。流量计设置在主供油管路上,油路冷却装置安装在回油总管路上。回油调节器相当于一个对柴油机供油的三级油柜,回油调节器的上部连通有主供油管路和柴油机回油管路的回油总管路,回油调节器的下部连通有柴油机供油管路的供油总管路。以湖南内河航道25.2米公务船为例,通过改造油路系统,实现一台流量计可以精准测量整个船舶三台柴油机油耗总量。且该油路系统改造简单,具有精度高、安装便捷、可靠性耐久性高的优点。

柴油加氢装置中循环氢气压缩机防喘振线分析及修正

本文介绍了循环氢气压缩机的循环流程、技术参数和防喘振调节原理,分析了循环氢气压缩机运行中防喘振阀出现的问题,制定防喘振修正具体方案。通过对防喘振线实际修正,最终得到真实的防喘振线。防喘振线修正后的循环氢气压缩机的运行情况说明,该压缩机防喘振性能曲线的修正是成功的。

燃油管道式烘丝机(HXD)燃烧炉系统的改进

燃油管道式烘丝机燃烧炉系统存在温度控制精度差、故障率高、柴油消耗大等问题,为此,对燃烧炉柴油管路系统进行了改进,将燃烧炉温度由单回路控制改为串级控制,根据柴油流量,通过检测燃烧炉尾气化学成分含量,对助燃空气风量进行自动调节,使助燃风机风量与柴油流量保持在最佳比例。应用效果表明,改进后工艺气流温度的响应速度和控制稳定性均有显著提高,燃烧炉的火焰信号增强且稳定。柴油管路系统运行可靠,点火失败或熄火故障次数由原来的2次/月以上减少为0,生产换牌时降低工艺气流温度30℃所需时间由20 min减少到10min左右,降低了柴油消耗,提高了生产效率。

PIV Measurements of Coolant Flow Field in a Diesel Engine Cylinder Head

This paper presents experimental measurements of coolant flow field in the water jacket of a diesel engine cylinder head. The test was conducted at three different flow rates using a 2-D PIV system. Appropriate tracing particles were selected and delivery device was designed and manufactured before the test. The flow parameters, such as velocity, vorticity and turbulence, were used to analyze the flow field. The effects of vortex which was located between the intake valve and the exhaust valve were discussed. The experimental results showed an asymmetric distribution of velocity in the water jacket. This led to an asymmetric thermal distribution, which would shorten the service life of the cylinder head. The structure optimization to the water jacket of cylinder head was proposed in this paper. The experimental system, especially the 2-D PIV system, is a great help to study the coolant flow structure and analyze cooling mechanism in the diesel engine cylinder head.