新品发布

饲料机械-SKLN系列逆流式冷却器；在线消解氢化物发生器；Agilent2100生物芯片分析系统；JulieC3型牛奶分析仪；DA7200近红外鲜奶奶粉分析仪；粉碎设备-LZM立式针型冲击磨；HY（WH）单级活塞推料离心机；新型秸秆揉切机。[编者按]     

汽车冷却系统的常见问题

冷却系统最常见的问题是发动机过热、冷却液漏失、电腐蚀和预热缓慢。据调查，在发动机过早出现的故障中，53％是由于忽略了对冷却系统的维护而引起的。从维修的观点来看，冷却系统需要注意以下几个方面：（1）散热器、压力盖、风扇、皮带、皮带轮、水泵、机油冷却器、恒温器、软管、密封垫和加热器；（2）冷却系统的热传导或“湿边”（冷却液与金属接触的部位）。此部位在发生损坏之前是很少被考虑到的。     

山西兰花科技:小技改拉动“消废”力

<正>本报讯近日,山西兰花科技创业股份有限公司煤化工公司投资30余万元将尿素工段废水冷却器进行了改造,由原来的板式换热更换为列管换热,既降低了系统排液阻力,又大大提高了解析废液利用率,每年可直接降低运行成本50余万元。以前,该厂的尿素系统每小时产生30多吨解析废液,有15吨左右回收用于造气系统,由于板式换热废水冷器存在排液阻力大的缺点,造成废液泵打液量不足,剩余的解析废液供给不到尿素大颗粒系统,只能白白排掉。技改后,由于排液阻力下降,废液泵的打液量得到保证,满足了将解析废液引入大颗粒的工艺条     

论空压机冷却器技术改造及实施效果

空压机被广泛的运用在工业生产当中,空压机为我国的工业生产带来了极大的便利,本文根据实际案例,阐述了空压机冷却器技术改造方法.     

发动机EGR率均匀分配研究及优化

为降低某发动机的综合排放,通过CAE耦合分析进气歧管及EGR管路的气体流场,了解发动机各缸EGR率均匀性,找出主要原因,并指导进气歧管系统的改进设计工作。优化方案B相比原方案A在EGR出口管路末端加了一个"稳流腔",废气进入该腔室后有一个缓冲、稳流的效果,通过壁面碰撞、反射,更有利于与进气混合地更均匀。通过优化后样件B相关试验验证,CAE预测值与实验值较吻合,且优化方案B,减小各缸EGR率的差异,改善发动机排放。     

SKLL系列立式冷却器的正确使用

ＳＫＬＬ系列立式冷却器的正确使用江苏正昌集团公司虞国忠，徐建华，丁建华在颗粒饲料加工过程中，从制粒机压制出来的颗粒温度一般在７０～９０℃之间，水分约１５％左右，必须通过冷却器冷却，使颗粒温度降到不高于室温６～８℃，水分降至１３％以下才能进行包装运输。...     

第七讲 柴油机冷却系统

冷却系统主要用来冷却气缸、气缸盖、活塞、喷油器、气阀、增压器空气冷却器以及滑油等。冷却系统工作的好坏，主要取决于系统组成方式、冷却介质的性质、冷却系统的温度、压力和流量的控制以及维护保养的质量等。     

船用12V135AC型柴油机冷却器的腐蚀故障及其排除方法

广东省海康县水产局的“中国渔政905”船,是由广东省珠海市香洲船厂于1986年7月建成投产的。船上主机采用安徽省先锋机械厂生产的东风135系列12V135AC型柴油机。该机缸径为135毫米,持续功率为259马力,转速为1500转/分。905船投产五年来,运行基本正常,但最麻烦     

Numerical simulation on phasing strategy for a gasoline engine with continuously variable intake camshaft

Intake camshaft equipped with continuously adjustable cam phasing units is applied to a 486Q gasoline engine. Phasing strategies are researched through engine cycle simulation to achieve superior engine performance. The simulation results show that at high load and low and moderate speed of the engine,phasing adjustment can lead to 6% to 8% increase in power performance because phasing advance contributes to suppressing intake backflow at IVC(intake valve closed). Cam phases obtained from numerical optimization have good agreement with engine test. At moderate load,cycle simulations show that phasing advance can increase residual gas coefficient from 9% to 20%,and reduce NO emission by 80%,BSFC(brake specific fuel consumption) by 2% at a demonstration operation. With regard to fuel economy and emissions,adjustment and optimization of intake phasing at moderate load are further verified by engine test. At low load,technical approaches to enhance combustion stability,reduce HC emission and improve cold start are investigated. The effectiveness of suppressing exhaust backflow into intake duct by phasing retard is testified by simulation. Phasing changes at the operating condition are optimally obtained by engine test for improvement of combustion stability.     

An experiment study of the realization of diesel engine emission standard of Euro IV

This paper calibrates the advanced injector angle and EGR of a four-in-line pressure engine on the specialized test stand, which makes the NOx achieved the standard of Euro IV. Then an experiment study of the diesel oxidation catalyst (DOC) and the particulate oxidation catalyst (POC) are made. Both make the diesel engine emission achieving the Standard of Euro IV. This experiment study shows a kind of method that realizing diesel engine emission standard of Euro IV, and concludes the character and law of the method.