燃煤锅炉NID脱硫系统的设计与应用

介绍了新型一体化NID半干法脱硫系统的工艺原理、NID技术特点、系统组成、设计参数和运行情况.     

甲烷煤尘耦合爆炸传播特性及伤害研究

为探究煤尘质量浓度对甲烷煤尘耦合爆炸传播特性及伤害距离的影响,自制长15 m的爆炸管道系统,用体积分数为7％甲烷分别与质量浓度为0、50、100和200 g/m3的煤尘进行耦合爆炸试验,并根据质量、动量和能量守恒理论推导出最大压力计算公式.结果 表明:不同质量浓度煤尘与甲烷耦合爆炸时,最大压力均随与爆源距离的增加呈现出...     

一起硫酸槽罐爆炸事故的直接原因分析

针对一起硫酸槽罐爆炸事故，在事故现场勘查资料以及其他有关资料分析的基础上，采用故障树定性分析了硫酸中间槽罐爆炸事故的直接原因，并对稀硫酸的成因进行了定性分析，得出了事故直接原因分析结论，总结了应该吸取的经验教训。     

Recent trends in rock dust modifications for improved dispersion and coal dust explosion mitigation

Underground coal mine explosions is perhaps the most hazardous danger in the coal mining industries. Efforts have been made to abate the coal dust explosion by applying rock dust either dry or wet. Dry dust has the best lift characteristic which efficiently quenches the flame propagation of a potential explosion. As a trade-off, undesired respirable dust particles are thereby generated imposing a severe health hazard on coal miners. Wet dusting is an alternative to dry dusting which significantly reduces the exposure to respirable dust particles. However, wet dust is subject to adverse caking issues which lead to a drastic reduction in the dispersibility of the particles. The present work summarizes the studies conducted to date regarding the surface modification of rock dust particles for the purpose of eliminating or alleviating the problems accompanying coal mine dusting applications, meanwhile improving the dispersive properties of dust particles and the ability to suppress the coal dust explosion.     

Methodology for case studies of accidental gas explosions

This paper discusses a procedure for case studies of accidental gas explosions. The procedure for each case study can be subdivided into four steps, i.e., collection of proofs, analyses, confirmation, and inference about the processes of the accident, and the issues in each step are pointed out. Making a guess on the sequence of the accident to be investigated should be avoided during collection of proofs. Misunderstanding of the phenomena in analyses and confirmation is likely caused by inappropriate knowledge on the phenomena and/or use of unsuitable models. The sequence of the accidental gas explosion should be inferred on the basis of confirmed processes. If there are other possibilities, those should be described in the report. The reasonableness of the results of a case study depends on the rationality of the procedure and the quality or plausibility of knowledge to infer the probable sequence.     

浮顶油罐油气惰化防火防爆实验研究

对浮顶油罐的油气空间进行惰化,是一种新的油罐防火防爆方法。向浮顶油罐一、二次密封间的油气空间中加入氮气,可缩小浮顶油罐的一、二次密封之间环形空间油气的爆炸极限的范围。根据这一原理,通过模型实验对大型双重密封型浮顶油罐的油气空间进行了氮气惰化保护实验研究。实验结果表明油气空间内氮气的体积分数会随着氮气通入时间的增长而逐渐升高,油气的体积分数则逐渐降低。氮气通入开始一段时间,环形空间内氮气的体积分数会迅速上升,油气体积分数迅速下降。但随着氮气通入时间的增长,氮气体积分数的上升和油气体积分数的下降速度都会趋于平缓。另外当入口处氮气流量从27Nm3/h变化到54Nm3/h时,为使油气体积分数下降至油气爆炸下限1%所需氮气持续通入的时间也从300分钟左右下降至200分钟左右。     

水泥粉尘的比电阻及其测量之二

水泥粉尘经分级，并经吸湿和吸油处理，对所得尘样分别测定比电阻，从而找出湿度等对比电阻的变化规律、分析其产生原因，为改进和合理使用电除尘器提供依据。     

利用声凝聚机理提高喷雾降尘效果的研究

本文论述了利用声凝聚机理提高喷雾降尘效果,特别是对呼吸尘的降尘效果的研究过程。由该机理建立了声波频率和声强与降尘效果之间的数学模型。在此数学模型的基础上,开展了对声波发生器和声学喷嘴的研究。实验及使用结果表明,声学喷嘴可以显著提高对呼吸尘的降尘效果。     

如何避免蒸汽锅炉爆炸事故的发生

通过锅炉爆炸事故的实例分析，阐述了锅炉在生产、安装、验收、使用、管理等方面必须遵守《锅炉安全技术监察规程》的有关规定，才能消除锅炉爆炸的隐患，确保锅炉的安全运行。     

煤矿瓦斯爆炸主要原因的试验研究

利用长径比为7,横截面积为1m~2,一端开口的7m~3的爆炸试验装置,停放成下斜、水平和上倾状态,模拟一段煤巷道的走向。用和瓦斯气具有相同比重的天然气作为试验的可燃气体,在上述试验装置内进行了一系列爆炸试验。试验结果证明了:煤矿向下倾斜的巷道对瓦斯气的自洁作用可保证不集存大量瓦斯气,是安全的;水平走向的巷道在有合适的通风情况下也是安全的;向上倾斜的巷道有集存瓦斯气的自恶化作用,会造成较强的爆炸。