简述LPG叉车特点

正1.LPG叉车应用历程液化石油气的英文名为liquefied petroleum gas,将其首字母缩写,简称为LPG。以液化石油气为燃料的叉车称为LPG叉车。早期的LPG叉车由汽油叉车改装而成,即在汽油叉车基础上增设一套液化石油气供气装置,不用改变汽油叉车原动力系统结构,就可将其改装为双燃料LPG叉车。汽油叉车应用液化石油气,不仅解决了能源短缺问题,而且用简单的方法解决了汽油叉车适应地方排放标准提高的问题。     

液化石油气切割

液化石油气切割,就是利用液化石油气(通常主要成分是丙烷和丁烷)代替乙炔的切割过程。它具有成本低,切割质量好,使用方便,安全可靠等优点。一、液化石油气割炬液化石油气与乙炔气的燃烧特性不同,所以应当使用专门的液化石油气     

液化石油气装置在叉车上的应用

由于工业先进国家对环境保护日益重视,采用液化石油气作燃料的叉车迅速增多。本文介绍了欧美市场上液化石油气叉车产品的汽油发动机改装技术、液化气燃料及系统装置、功率与废气调节控制和保养使用情况。     

氧—液化石油气焰切割工艺及效益分析

氧—液化石油气焰切割工艺是以液化石油气作为预热燃气的氧气切割工艺。因氧—液化石油气焰存在着温度低,燃烧速度慢等缺点,严重地影响了氧气切割的过程,为此,我公司在1992年下达了《氧—液化石油气焰快速精密切割技术攻关>>课题。该课题针对氧—液化石油气焰温度低的特性,研制了凹凸型割嘴,提高了切割氧到达割缝时的纯度和动能,集中稳定了预热火焰。同时配合适宜的操作技术,提高了切割速度和割口质量,改善了工艺性能。该项目获公司     

液化石油气叉车的特点及应用技术

1.液化石油气叉车的特点 (1)大大减少了废气的排放。使用LPG(液化石油气)与汽油相比,CO的排放量减少80％,HC减少75％,NOx也有明显的下降。 (2)有利于改善发动机的润滑状况。使用LPG作燃料,进入发动机的混合气为干式混合气,不会稀释和劣化发动机机油,同时燃烧时极少积炭,因此,润滑状态     

氧—液化石油气焊技术研究

通过分析氧液化石油气火焰的燃烧过程,计算火焰的理论燃烧温度后认为,氧液化石油气火焰的温度可以进行焊接,但是火焰的内焰具有氧化性,不能很好保护熔池金属,通过改变焊嘴的结构,使火焰内焰在燃烧时处于中性就可以进行气焊,通过采用高锰高硅填充丝进行焊缝填充和脱氧,保证接头质量.     

进气温度对甲醇发动机燃烧及非常规排放的影响研究

通过模拟软件CONVERGE耦合甲醇氧化详细化学动力学机理,在1台由DH1115单缸柴油机改装而成的电热塞助燃式直喷甲醇发动机上,研究了进气温度对甲醇发动机燃烧及非常规排放的影响。结果表明,提高进气温度,有利于改善甲醇的蒸发及扩散,提高甲醇与空气混合质量,改善燃烧质量、降低非常规排放。当进气温度从300K提高到360K时,压力、放热率和温度峰值提升显著,甲醛及未燃甲醇排放分别减少到了0.1mg·kWh-1、0.2mg·kWh-1,降低幅度接近100%。     

液化石油气汽车应用初探

通过液化石油气与高级汽油的性能比较，展示了车用液化石油气广阔的应用前景．结合车用液化石油气系统的使用情况，通过系统构造、工作原理等阐述，论证了加快开发研制车用液化石油气系统和液化石油气汽车推广应用的可能性和必要性。     

使用液化石油气时对氧-乙炔割炬的改制

可燃气体的种类很多,但目前使用最普遍的是乙炔气体。随着科学技术的发展,人们要求有一种能够使用液化石油气作燃气的割矩。下面就介绍在使用液化石油气时,对氧-乙炔割矩的改制方法。1.在切割过程中,由于液化石油气完全燃烧时所需的氧气量比使用乙     

柴油车排放控制新技术

浙江大学的一项新的研究成果能在加气和全柴油动力性持平情况下，使柴油车尾气的平均烟度下降率达６５％，平均排气温度下降３０℃。 这项名为“柴油汽车发动机混烧液化石油气燃料供给装置”的成果是田浙江大学能源工程系教授夏 来庆主持研究开发的。 据介绍，新研制的这种装置将 液化气送入柴油机气缸里与柴油同 时混烧，从而可以大幅度改善柴油机的冒烟状况。因为，液化石油气和 天然气一样都是清洁燃料，并且汽 化时能与空气混合均匀，燃烧较完 全，微粒排放极低。国内外统计资料改动的前提下，７０％的柴油与 ３０％的 液化石油气混烧可…     

An experimental study on spray and combustion characteristics of LPG for application in direct-injection

As an alternative fuel that can be used in SI engines, LPG is a clean fuel with larger H/C ratio compared to gasoline, low CO₂ emission, and small amount of pollutants such as sulfur compounds. In the Spark-ignition (SI) engine, Direct injection (DI) technology can significantly increase the engine volumetric efficiency and decrease the need for a throttle valve. DI allows engine operation with the stratified charge, which enables a relatively higher combustion efficiency. Stratified charge can be supplied to nearby spark plugs to allow for overall lean combustion, which improves thermal efficiency and can cope with problems regarding emission regulations. In this study, a visualization experiment system that consists of visualization combustion chamber, air supply control system, emission control system, LPG fuel supply system, electronic control system and image data acquisition system was designed and manufactured. For all cases for which ignition was successful, flame propagation image was digitally recorded using ICCD camera, and the recorded flame propagation characteristics were examined. This study, in its results, is expected to make a contribution in terms of important data for the design and optimization of a Spark-ignited direct injection (SIDI) LPG engine.

     

北美最新汽油机油标准ILSAC GF-4与ILSAC GF-3比较

简要回顾了ILSACGF-4汽油机油标准的发展历史。介绍了ILSACGF-4与ILSACGF-3标准对汽油机油性能的要求,并对它们在汽车尾气排放系统兼容性要求、抗磨损及抗氧化性能要求、旧油低温性能要求和燃料经济耐久性要求等方面的差异进行了比较,剖析了北美最新汽油机油规格ILSACGF4。     

高组份含水甲醇汽油台架试验研究

通过台架试验将含水甲醇-汽油混合燃料（含水甲醇的体积分数分别为50%和60%,简称M50W、M60W）和93#汽油进行对比,研究了M50W、M60W燃料对汽油机动力性能、经济性能和排放性能的影响。试验研究表明,该台架上燃用M50W、M60W混合燃料对汽油机动力性影响不大,但汽油机有效热效率和燃油经济性提高,排温有所降低;CO排放减少,HC排放基本保持不变,NOx排放与燃用93#汽油相比有上升。     

LJ465Q-2AE1汽油机满足欧Ⅲ排放标准的研究

LJ465Q-2AE1发动机是新研制开发达到欧Ⅲ排放要求的汽油机,它具有结构紧凑、升功率大、油耗低、转速高、噪声小等特点。笔者介绍了如何对该汽油机的燃烧系统、进气系统、点火系统及排气催化转化系统进行的优化设计。     

APPLIED RESEARCH ON NEW MULTI-FUNCTION GASOLINE ADDITIVE

In order to assess the performance of a new cleansing and combustion-improving gasoline additive (MAZ), and to explore the evaluation methods of additives, two engines with the same model number and performance indices, fueled with and without the MAZ gasoline additive respectively, are carried through 100 h strenuous tests on a bench. The results obtained in full load characteristic and load characteristics of different operational modes are compared. It indicates that the power, economy and emission of the engine fueled with the MAZ additive all have obvious improvement in comparison with the engine without adding the additive: the power increasing by 16.43%, specific fuel consumption (SFC) decreasing 5.39%, and the emission of CO, HC and NOx falling by 28.61%, 54.38% and 10.1% respectively. Wear and tear of the engine cylinder is weakened, and sediment of combustion chamber inner side is reduced. In addition, no negative effect on the catalytic conversion device is found.     

STUDY ON INJECTION AND IGNITION CONTROL OF GASOLINE ENGINE BASED ON BP NEURAL NETWORK

According to advantages of neural network and characteristics of operating procedures ofengine, a new strategy is rapresented on the control of fuel injection and ignition timing of gasolineengine based on improved BP network algorithm. The optimum ignition advance angle and fuelinjection pulse band of engine under different speed and load are tested for the samples trainingnetwork, focusing on the study of the design method and procedure of BP neural network in engine     

COMPOSITIVE EMISSION CONTROL SYSTEM OF GASOLINE VEHICLE

The working principle of a kind of compositive emission control system is inquired into, which includes exhaust heater, secondary air supplement, exhaust gas recirculation (EGR), thermal reactor and catalytic converter, etc. The purification effect of CO, HC and NOx emission of the gasoline spark ignite (S.I.) engine is studied. The entire vehicle driving cycle tests based on the national emission standard and a series of the gasoline engine-testing bench tests including full load characteristic experiment, load characteristic experiment and idle speed experiment are done. The results show that the system has a very good emission control effect to CO, HC and NOx of gasoline engine. The construction of the system is very simple and can be mounted on the exhaust pipe conveniently without any alteration of the vehicle-use gasoline engine.     

汽油添加剂对改善发动机性能的试验研究

本文叙述了汽油添加剂的主要作用和分类,并通过发动机台架试验研究了美狮汽油添加剂对发动机经济性及排气净化的影响,试验结果表明汽油中添加体积分数为01%的美狮汽油添加剂能够改善发动机经济性及排放性能。     

现代汽油机基于点火能量的点火系统研究

以点火能量为线索,对现代汽油机点火系统主要零部件的功能特点进行分析和阐述;简述了点火系统零部件的原理以及其对点火能量的影响。电控点火系统的有效匹配可使发动机的动力性、经济性和排放得到改善。     

Coefficient of Engine Flexibility as a Basis for the Assessment of Vehicle Tractive Performance

The paper attempts to analyze full load characteristics of over 500 combustion engines. Using statistical tools, the author determined the value of the coe cient of flexibility. Engine flexibility is the capability of the engine to adapt to varying loads. Importantly, in the investigations, the author took into account the parameters calculated in the course of the investigations on a chassis dynamometer, i.e., actual, not taken from technical specifications of brand new vehicles. Di erent stages of operating wear allow a better characterization of the population. Subsequent utilization of the results in tractive calculations is more reliable. The engines were divided into in six groups, depending on the type of fuel system: fuel injected gasoline and turbocharged gasoline, spark ignition LPG, naturally aspirated diesel and turbocharged diesel. However, engines running on alternative fuels are characterized with a greater flexibility than the fuel injected base engines. Conformity of flexibility of fuel injected and LPG IV generation engines have been observed,which confirms the appropriateness of engine adaptation to alternative fueling. Gasoline engine supercharging allowed a reduction of the maximum engine speed of the maximum torque, which extends the range of analyzable speeds for flexibility and consequently, the flexibility as such.