共查询到19条相似文献,搜索用时 125 毫秒
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防爆电机的分类及其防爆原理 总被引:1,自引:0,他引:1
防爆电机按防爆原理可分为隔爆型电机、增安型电机、正压型电机、无火花型电机及粉尘防爆电机等.分别介绍了几种防爆电机系列及其特点,以及介绍了防爆电机和普通电机的区别. 相似文献
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可燃性粉尘的爆炸特性、分类及防爆措施 总被引:1,自引:0,他引:1
主要阐述了粉尘的特性、分类、行业分布以及可燃性粉尘危险场所的划分和发生爆炸后的危害.针对粉尘的爆炸机理及影响粉尘爆炸的因素,采取了限制工业粉尘环境及煤矿井下的粉尘浓度以及采用粉尘防爆电气设备等防爆措施. 相似文献
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随着粉末、冶金、化工、纺织、粮食加工贮运等行业的飞速发展,做为爆炸性粉尘(纤维)危险环境中的动力设备——粉尘防爆电动机的市场需求量也不断增长,因此开发粉尘防爆电动机势在必行,粉尘防爆电动机具有广阔的发展前景。粉尘防爆电动机的结构同普通电机结构基本相同,具有电机主腔和接线腔。在这里我们不考虑其电气性能,只研究其粉尘防爆性能的必要条件(电机主腔与接线腔之间、电机主腔、接线腔与外界之间的粉尘防爆性能)。粉尘防爆电动机外壳按其限制粉尘进入电动机的能力分为两类:一类尘密外壳(即尘密型电动机,其防护等级IP6… 相似文献
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电除尘器出口烟尘质量浓度反馈控制可以降低电除尘器的高能耗,出口烟尘质量浓度动态模型是实现电除尘器质量浓度反馈控制的基础。本文研究了超超临界1 000 MW机组五电场结构干式电除尘器静态特性和动态特性。首先对前三电场进行静态特性试验,在此基础上以电除尘器末级两电场高频电源的二次电流为输入,出口烟尘质量浓度为输出,在4个典型负荷点做二次电流的阶跃扰动试验,根据试验数据,采用免疫遗传算法拟合出口烟尘质量浓度传递函数动态模型,并将模型结果与实际测量结果对比。结果表明,建立的动态模型可以反应电除尘器的真实特性,具有较高的精度。 相似文献
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The influence of sand dust on discharge of external insulation has caused widespread concern.At present,the research results show wind-sand electricity has a remarkable effect on the discharge characteristics of insulator and has little influence on the discharge characteristics of air gap.The flashover of insulator strings occurs along the insulator surface and air gaps,and the sand dust deposited on the insulator surface may affect the flashover characteristics of insulator strings.This paper studies the flashover characteristics of flat plate model under DC voltage in wind-sand condition.The experimental results show that under positive polarity voltage,the flashover voltage of the flat plate model has a maximum value,while under negative polarity voltage,the flashover voltage of the flat plate model has a minimum value with a certain degree of sand dust deposition.The wind or sand in sand-dust weather has an important effect on the flashover characteristics of the flat plate model.In certain variation range of electric charge,electric charge of sand dust has little effect on the flashover voltage of flat plate model under DC voltage.The deposition of sand has significant influence on the flashover process of flat plate model,which is related to the deposition density and moisture content of sand particle. 相似文献
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介绍了江苏国电谏壁发电厂300MW机组SG-1025/16.77-M849型燃煤锅炉及电除尘器的设备概况,分析了电除尘器运行状况.通过对电除尘器进行性能测试,指出其除尘效率下降及运行参数不佳的问题,并分析了除尘效率下降及运行参数不佳的原因,提出了局部改造方案.经改造,电除尘器达到了预期的技术要求,除尘效率提高到99.3%。 相似文献
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尘土腐蚀对电接触表面的影响 总被引:2,自引:3,他引:2
对北京尘土中水溶性成分进行了分析测定,结果表明:水溶性成分中含有K^ 、Na^ 、Ca^2 、Mg^2 、NH4^ 、SO4^2-、NO3^-、Cl^-、F^-、HCO3^-、NO2^-等离子。对失效的连接器分析发现:在电接触表面上有大量的污染物,腐蚀产物中含有K、Ca、S、Cl等尘土水溶性成分。文章探讨了尘土的腐蚀作用及尘土腐蚀对电接触可靠性的影响。 相似文献
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本文针对火电厂粉尘污染净化治理中对电除尘器的实际需求,以日本三菱FX2N系列PLC为核心,对电除尘振打控制系统进行技术改造。利用PLC控制电除尘器振打电机,实现振打系统的自动运行,提高了除尘器的除尘效率。 相似文献
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Sakai K. Labrado Abella D. Suehiro J. Hara M. 《Dielectrics and Electrical Insulation, IEEE Transactions on》2002,9(4):577-588
This paper discusses the charging and behavior of a spherically conducting particle on a dielectrically coated electrode in non-uniform dc and ac electric fields between non-parallel plane electrodes in atmospheric air. The charging mechanism of a particle resting on a dielectrically coated electrode is investigated by observing light emissions from partial discharges and by utilizing the dust figure technique. The charge acquired by a particle is estimated from the results of particle motion onset voltage measurement and direct measurement with a Faraday cage. The basic particle movement as well as particle-triggered breakdown characteristics under non-uniform electric field distribution along the electrode surface is also investigated. The results suggest that the effect of the electrical gradient force/dielectro-phoretic force on particle motion on a dielectrically coated electrode should be adequately considered in the design of gas insulated systems (GIS). This is because a particle can move laterally on the coated electrode toward increasing electric field regions by the action of the electrical gradient force which is independent of the charge on the particle. Also the possibility of the particle charging and lifting at high field regions or reaching and adhering onto an insulating spacer further increases the risk of breakdown. 相似文献