JKG型空气干燥器故障分析及防止措施

1引言合肥机务段配属DF4D、DF8B型机车共160台,均装有JKG型空气干燥器。该干燥器的工作状态是否良好,直接关系到压缩气体质量的好坏。如果工作状态不良,压缩空气得不到净化,含有水分杂质的压缩空气进入空气管路及各阀件,将导致机车制动系统故障多发,对行车安全构成严重威胁。随着列车的重载、提速,对用风的要求越来越     

机车空气干燥器的改进

1引言 作为机车风源净化系统主要部件的空气干燥器在使用过程中经常出现漏泄故障,造成机车总风缸压力迅速下降。机车空气压缩机虽然持续工作,但压缩空气漏泄速度大于供风速度,使机车总风缸压力逐渐低于规定压力值,机车不能按技术标准实施制动、缓解,对行车安全产生严重威胁。     

JKG1型风源净化器故障原因分析及改进方法

介绍了JKG1型风源净化器的工作原理、结构,分析了其故障原因,提出了改进方法。经改进,防止了由于风源净化器故障造成的制动机失灵。     

对DF11型机车微机控制系统的几点改进建议

将计算机控制技术应用于机车控制是机车现代化的重要标志。DF11型机车微机控制系统基本上实现了车载微机对机车的控制,它主要由电子柜和诊断显示屏(CDID)构成,电子柜由微机控制装置(EXP)、信号变换组件和各种类型的传感器组成。微机控制装置不仅具有牵引恒功,电阻制动恒流,     

HXN5型机车用空气干燥器

简要介绍了994-501MC型空气干燥器在HXN5型机车空气管路系统中的布置、结构、配线、记忆周期、主要技术参数、主要性能、检查和维护,详细介绍了其工作原理。     

康明斯NTA855-M型船用柴油机的几点改进建议

通过对NTA855-M350柴油机特点分析和车渡船上的实际使用情况,指出该型柴油机用作渡船主机存在的问题,并提出了改进建议。     

改进S195型柴油机润滑系统的几点意见

1.问题的提出 S195型柴油机系60年代开发的具有中国特色的产品,目前已成为我国农机行业产量最大、使用最广的一种小型农用柴油机。由于六十年代我国电力资源严重不足,具有重量轻、马力大的S195型柴油机,被广泛应用于固定式作业的排灌动力和农副产品加工动力。进入八十年代,随着农村电网的普及,     

内燃机车空气干燥器系统故障的快速处理法

1前言 内燃机车空气干燥器在实际运用中经常发生排风不止的故障,故障现象都表现在排气阀上,但每次发生故障不一定是由排气阀的原因造成的。我们经过多年的摸索,在实践中总结出了空气干燥器故障的快速处理方法。该方法的应用是在机车无须停机、风泵继续打风的情况下来判断干燥器的哪个阀出现了故障,使用此法大幅度提高了检修效率。     

机车空气干燥器故障检测装置的研制

通过对机车空气干燥器工作原理以及所出现故障的分析,提出了判断空气干燥器故障的一个全新思路,即判断再生风缸的压力是否为零。通过加装传感器来检测机车空气干燥器是否出现故障,并且通过显示和报警装置,使乘务员在运行当中能够明确判断机车空气干燥器工作是否正常,出现故障后能进行故障切除,保证机车的正常运行。     

First and second law analyses of a typical solar air dryer system: a case study

This communication presents an experimental study based on energy and exergy analyses of a typical solar air dryer. On the basis of the experimental results, the first and the second law efficiencies are calculated with respect to the available solar radiation. It is found that the second law efficiency is much less than the first law efficiency irrespective of the mass flow rate of the circulating fluid. It is also found that both efficiencies are an increasing function with respect to the mass flow rate of the working fluid. For a particular day, it is also found that first and second law efficiencies fluctuate according to radiation. The results obtained in this article are found to be consistent with those obtained by earlier authors as given in the literature.     

DF4型机车燃油系统漏气的原因分析及改进措施

1　问题的提出　　燃油系统相当于机车的“血液”管道 ,其能否正常流通供给 ,将直接影响机车起机及运行状况。为保证检修后的机车正常安全使用 ,提高机车质量 ,减少因燃油系统故障而引起的碎修、临修率 ,更好地促进安全运输生产工作 ,我们对此进行了跟踪、查找、分析工作。终于     

Hydrogen peroxide for improving premixed methane–air combustion

In this study, the effects of hydrogen peroxide on laminar, premixed, methane–air flames at atmospheric pressure and temperature were investigated using CHEMKIN III and GRI 3.5 mechanism. The range of fuel/air equivalence ratio (φ) was varied from 0.6 to 1.2, and the amount of hydrogen peroxide was altered from 0% to 20% volumetric fraction of the methane–hydrogen peroxide (air excluded) mixture. The burning velocity was found to increase with increasing hydrogen peroxide addition, with a relatively larger increase for the fuel-richer mixtures (ΔS_u up to 15 cm/s for φ≈1.2). The adiabatic flame temperature rose with hydrogen peroxide addition, and the temperature rise per unit hydrogen peroxide addition was more significantly (ΔT up to 100 K) for the leaner mixtures. For the same mixture stoichiometry, adding hydrogen peroxide also increased CO concentration and NO_x emissions somewhat. Accordingly, the benefits of adding hydrogen peroxide to the combustion conditions considered here can be best realized by burning leaner mixtures.     

提高回转式空气预热器性能途径的研究

回转式空气预热器是大型电站锅炉广泛采用的尾部换热设备,空气预热器的性能对锅炉机组的效率有很大影响。通过对回转式空气预热器在运行过程中常见的问题进行分析,提出了提高空气预热器整体性能的方案,并针对这些问题,总结分析并提出了对策,对提高空气预热器的性能具有指导性的意义。     

SDD1A型机车进气系统的设计

针对苏丹铁路沿线风沙大的特点,在资阳机车有限公司出口苏丹的SDD1A型机车上采用了一种既能够防风沙又满足机车冷却通风能力的进气系统,对其结构布置和特点进行了介绍.机车实际运用情况表明,该进气系统设计非常成功.     

Heat-pump-assisted dryer part 1: Mathematical model

A mathematical model for an integrated heat-pump-assisted dryer has been developed. The dryer has been modelled considering the heat transfer and simultaneous heat and mass transfer zones. The heat-pump heat exchangers have been modelled by writing the enthalpy balance for differential lengths considering the various zones on the air and working-fluid sides. The compressor has been described by the polytropic compression equation. The model has been used for simulating an existing system using R11 to study the effect of approach velocity of air to the evaporator and of the suction superheat on the specific energy consumption of the heat pump assisted dryer.