球磨机的电除尘器的技术改造

广西桂林鲁山建材联合有限责任公司制成车间水泥3#磨电除尘器,经过几年的运行,设备老化,收尘效果不理想,排尘远远达不到国家标准。针对这一现状,公司展开了一系列的技术改造。     

基于CORBA的电子商务系统的安全性

电子商务使用了刊登广告并出售货物的新方法来进行交易，并为动态开放式电子 商务环境中的大组客户提供服务和信息。本文说明了实现电子商务应用程序所用的技术，该技 术集中于 CORBA 框架对于这些解决方案的支持。     

流火的六月 别样的毕业典礼

这个六月,可谓是热热闹闹。首先,是如火如荼地进行着的世博会,将一波又一波的中外游客吸引而来;接着,是一年一度的高考,将广大学子和家长的心揪在一起;     

疯狂的iPhone滑稽的Apps

iPhone一直给我们带来一堆堆Crazy的想法和软件,而拥有iPhone的疯友不仅仅可以使用种种实用软件,还可以通过iPhone激发出我们一个又一个的搞怪欲望。虽然这些软件在我们看来都不怎么实用,但是有时候却能够带来无穷的乐趣。新年当前,用iPhone玩味一把也无妨,或许还会让身边的亲人朋友乐在其中。     

TRT技术的马钢的应用

介绍了马钢四铁厂1号高炉TRT系统工艺流程与技术特点,并对系统效益作了分析与评价。     

新概念的微型燃气轮机的发展

介绍功率为数十至数百kW的、新概念微型燃气轮机的发展情况。     

甲醇喷雾着火过程的化学动力学模拟

本文利用广安博之的喷雾分区模型与油滴蒸发速率模型相结合,给出燃烧室内燃油与空气的分布.依据实验数据,确定了含有18种组分、30步基元反应、适合于柴油机缸内条件的甲醇喷雾着火过程的化学动力学模型,能模拟燃烧室内甲醇喷雾自燃过程特征,用于对使用空气加热的纯甲醇压燃过程的滞燃期预测.结果表明,该模型能较成功地预测各种发动机工况下的着火滞燃期.     

用瞬态光谱技术对柴油机着火时刻的火焰光谱的初步研究

介绍了自行研制的光纤燃烧传感器配合OMA4光通道分析系统,在国内首次对柴油机的着火时刻火焰光谱进行了测量和分析。实验表明:燃烧过程中产生大量自由基,波长主要集中在紫外区和一部分可见光区;碳粒子的连续热辐射谱对测量结果有很大的影响。并验证了Fenimore关于碳氢燃料快速型NO机理。     

预燃室式柴油机着火滞燃期测量与分析

本文作者通过对预燃室式柴油机燃烧过程的预燃室压力、火焰光强和针阀升程等主要参数的实际测量,获得了预燃室式柴油机的物理滞燃期、冷焰持续期、兰焰持续期、热焰持续期、发光滞燃期、压升滞燃期和温升滞燃期的精确数据.根据测量结果,对预燃室内的燃烧过程的微观变化进行了探讨.同时,对三种滞燃期的负荷特性进行了对比分析,从而获得一些全新的认识.     

柴油在甲醇/空气高温热氛围中的着火和燃烧特性

在定容燃烧弹上进行了柴油分别在空气和在甲醇/空气预混均质混合气中着火燃烧的实验研究.结果表明,与空气热氛围相比,甲醇混合气热氛围延长了柴油的滞燃期和加长了火焰浮起高度.采用正庚烷-甲醇的详细化学反应机理,利用数值模拟的方法计算了零维模型中正庚烷及正庚烷加甲醇的燃烧反应过程和中间产物历程.其结果表明,甲醇的加入使得正庚烷的高低温放热反应开始时刻后移,滞燃期延长,低温放热反应峰值明显下降,且无明显的负温度系数区,高温反应放热峰值高于其在空气氛围中,归其原因在于甲醇大量消耗着火的OH自由基,并将其转化为低温氧化中不活跃的H2O2,使得系统着火前反应活性减弱.实验和计算结果均表现出甲醇具有抑制柴油及其参比燃料着火的作用.     

利用实测放热规律研究十六烷值改进剂对柴油机着火特性和燃烧过程的影响

通过基础油和加剂油实测放热规律的对比,就自行研制的ｃ－ＲＯＮＯ２柴油十六烷值改进剂对柴油机着火和燃烧过程的影响进行了深入的分析。结果表明,十六烷值改进剂能加速柴油的氧化过程,缩短着火滞燃期,使预混合燃烧期和扩散燃烧期的放热百分经得到合理分配,从而改善了柴油机的着火和燃烧特性。     

Ignition of polyoxymethylene

An experimental opposed flow diffusion flame system has been developed with which polymer ignition may be carefully investigated. The effects of ignition source intensity, oxidizer flow rate, and oxidizer composition on the ignition of polyoxymethylene have been studied. Comparisons with available theoretical models have been made where possible. It is concluded that the polymer surface temperature at ignition is independent of ignition source intensity, oxidizer composition, and oxidizer flow rate; that the ignition delay time is independent of oxidizer velocity over the range of velocities for which a flat flame can be established in the opposed flow diffusion flame system; that gas phase absorption of radiation may affect the ignition process even for relatively small optical depths and low source intensities; that the ignition delay time decreases linearly with increasing oxygen concentration in $\text{oxygen}\text{nitrogen}$ mixtures for low flame stretch rates; that ignition occurs during the transition stage when the free stream oxygen mass fraction is less than the oxygen mass fraction in the solid, and for higher free stream oxygen mass fractions it appears that oxygen diffusion to the surface is enhancing the gasification rate during the transition stage and/or decreasing the period of the transition stage; and that the various processes occurring in the gas phase during the ignition event appear to result in a net liberation of energy.     

S195柴油机燃用纯甲醇、采用多火花助燃的研究

本文介绍了在S 195柴油机上燃用纯甲醇、采用多火花助燃的研究结果。选取合适的火花塞电极间隙、电极间隙与喷注空间匹配和正确的喷油、点火定时是保证非均相可燃混合气可靠着火燃烧的关键。当优化了上述参数后,发动机能在广阔的转速、负荷范围内稳定运行。燃用纯甲醇的柴油机与燃用柴油时热效率接近,并能实现无烟燃烧。试验表明,这种高压缩比、强涡流的柴油机对多火花点火系统有更好的适应性。     

重油预混层流点火特性的仿真分析

基于重油点火特性研究的需要,利用定容燃烧弹研究预混层流燃烧的优点,采用仿真分析方法对定容燃烧弹中柴油和煤油混合气预混层流点火特性进行了研究,得出了柴油和煤油的点火特性;研究成果可为重油发动机的开发提供一定的理论参考。     

Ignition delay of dual fuel engine operating with methanol ignited by pilot diesel

An investigation on the ignition delay of a dual fuel engine operating with methanol ignited by pilot diesel was conducted on a TY1100 direct-injection diesel engine equipped with an electronic controlled methanol low-pressure injection system. The experimental results show that the polytropic index of compression process of the dual fuel engine decreases linearly while the ignition delay increases with the increase in methanol mass fraction. Compared with the conventional diesel engine, the ignition delay increment of the dual fuel engine is about 1.5° at a methanol mass fraction of 62%, an engine speed of 1600 r/min, and full engine load. With the elevation of the intake charge temperature from 20°C to 40°C and then to 60°C, the ignition delay of the dual fuel engine decreases and is more obvious at high temperature. Moreover, with the increase in engine speed, the ignition delay of the dual fuel engine by time scale (ms) decreases clearly under all engine operating conditions. However, the ignition delay of the dual fuel engine increases remarkably by advancing the delivery timing of pilot diesel, especially at light engine loads.