120t转炉二次除尘系统的设计

攀钢提钒炼钢厂设有二座12Ot转炉,以提钒出半钢为主,冶炼周期30min,二次烟尘的散发量较单纯转炉炼钢多。二次除尘系统除兑铁水、出钢、加废钢外,还需捕集倒钒渣操作过程的烟气。在整个30min的冶炼过程中,除纯吹氧8min外,二次除尘系统几乎都在不同抽风负荷状态下工作。根据转炉二次     

提高转炉二次除尘效率的难题及对策

以某炼钢厂2×100 t转炉二次除尘系统为例,对其在长期的除尘实践中反映出来的问题进行了分析,并结合实际提出了解决对策,经实施并优化后取得了良好的效果.     

转炉除尘风机出口噪声治理实例

噪声声源分析我厂15吨顶吹转炉烟气除尘系统所使用的抽风机,型号为B8—18—1216~#,电动机功率300千瓦,6千伏电源,1480转/分,     

武钢二炼钢3×80t转炉二次烟气除尘系统改造

武汉钢铁(集团)公司二炼钢厂3座50 t转炉扩容为80 t后,除尘效率下降,因此对二次烟气除尘系统扩容改造.鉴于部分二次烟气从转炉上方楼板的众多设备孔口处逸出,在该楼层设备孔口区域围设密闭室,保持室内呈微负压状态,可有效控制烟气外逸.     

转炉二次除尘系统问题诊断及运行优化

针对某企业150 t转炉二次除尘系统烟气捕集效果不佳、布袋除尘器压差大、运行能耗高等问题进行了系统诊断,利用排查系统管网、实测压力和流量、分析风机特性等手段,找出了问题原因并提出改进措施。通过实施改进措施,优化了150 t转炉二次除尘系统的运行方式,确保二次除尘效果并实现节能、经济运行。     

大型布袋除尘器在转炉二次除尘中的应用

唐钢一炼钢厂易地大修工程150 t转炉烟气二次除尘,采用大型负压反吹风布袋除尘器,本文对该系统的设计做了总结。     

大型布袋除尘器在转炉二次除尘中的应用

唐钢一炼钢厂易地大修工程150t转炉烟气二次除尘,采用大型负压反吹风布袋除尘器,本文对该系统的设计做了总结。     

转炉二次烟气除尘采用电除尘器防爆的可行性

通过分析转炉一次烟气除尘、二次烟气除尘的工艺和烟气成分，论述了转炉二次烟气采用电除尘器除尘不会发生CO爆炸，论证了转炉二次烟气除尘采用电除尘器是可行的。     

转炉二次烟气除尘采用电除尘器防爆的可行性

通过分析转炉一次烟气除尘、二次烟气除尘的工艺和烟气成分,论述了转炉二次烟气采用电除尘器除尘不会发生CO爆炸,论证了转炉二次烟气除尘采用电除尘器是可行的。     

粉尘爆炸特征和预防措施探讨

随着现代工业的发展,粉末技术得到了广泛应用,使得粉末产物日益增多.许多粉体加工企业对粉体的相关危害知识没有深刻的认识,这些物质在安全生产、储存、运输和应用过程中,安全管理比较混乱,没有做到很好的防护,缺乏必要的防火防爆设施,再加上操作人员思想上的麻痹大意.粉尘爆炸的危险性大大增加,粉尘爆炸的事故也频繁发生.粉尘爆炸具有很强的破坏力,往往造成重大人员伤亡和严重损失,已经越发成为工业安全不可忽视的重要问题.本文从粉尘爆炸的基本特征出发,论述了粉尘爆炸的机理、条件、特点.根据粉尘爆炸需要的条件,从可燃物、助燃物和点火源三个方面,提出了在实际生产中,预防粉尘爆炸的一些具体措施,以期指导安全生产.     

Incendiary characteristics of electrostatic discharge for dust and gas explosion

Paying attention to the ignition potentiality of static electricity, the relation between the discharge characteristics and the ignition of a dust cloud and the gas produced was studied, applying an electrical power supply of which the electrical circuit is adjustable. The effect of ignition characteristics on dust and gas explosions was investigated. The results of the study indicate that the probability of an explosion is influenced by the minimum ignition energy, spark duration time, feeding rate of ignition energy, circuit capacitance, ignition voltage, etc.     

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.     

不同粒径镁铝合金粉尘爆炸与抑爆特性研究

为了研究镁铝合金粉爆炸危险特性,利用20L球形爆炸容器进行测试,结果表明:180目 (80 μm)、 120目(125 μm) 和60目(250 μm)3种粒径下的金属粉尘爆炸下限浓度分别为45 g/m3,55 g/m3和95 g/m3。相同浓度下最大爆炸压力随粒径增大的而减小。以碳化硅和石墨为代表的研究中,60目,120目和180目的镁铝合金粉以10%的浓度梯度加入碳化硅浓度分别至50%,70%和80%,石墨浓度至30%,50%和60%时,镁铝合金粉不会发生爆炸。表明碳化硅及石墨等惰性粉尘都能对粉尘爆炸有抑制作用,其中石墨对镁铝合金粉的抑爆作用明显优于碳化硅。     

瓦斯积聚量及爆炸距离对风机和防爆门的影响研究*

为揭示瓦斯积聚量及瓦斯爆炸距离对风机和防爆门的影响机制,利用Fluent模拟软件,结合宁煤集团羊场湾矿的实际情况,在构建三维数学物理模型的基础上,开展不同瓦斯积聚量（56.52,113.04,169.56,226.08 m3）和不同爆炸距离（20,30,50,70 m）条件下的模拟研究。研究结果表明:风机和防爆门处超压峰值随瓦斯积聚量增加而增加,均呈线性关系,瓦斯积聚量为56.52 m3时风机处超压峰值为0.260 MPa,小于风机破坏荷载0.306 MPa;考虑安全系数前提下,当瓦斯积聚量超过56.52 m3时防爆门应开启保护风机;在确定瓦斯积聚量为56.52 m3基础上,分析不同爆炸距离对风机和防爆门影响,由模拟结果可知,风机和防爆门处超压峰值随爆炸距离增加而降低,均呈幂函数关系。研究成果可为瓦斯爆炸对风机和防爆门的影响研究提供指导。     

Risk assessment method of polyethylene dust explosion based on explosion parameters

The explosion characteristic parameters of polyethylene dust were systematically investigated. The variations in the maximum explosion pressure (P_max), explosion index (K_st), minimum ignition energy (MIE), minimum ignition temperature (MIT), and minimum explosion concentration (MEC) of dust samples with different particle sizes were obtained. Using experimental data, a two-dimensional matrix analysis method was applied to classify the dust explosion severity based on P_max and K_st. Then, a three-dimensional matrix was used to categorize the dust explosion sensitivity based on three factors: MIE, MIT, and MEC. Finally, a two-dimensional matrix model of dust explosion risk assessment was established considering the severity and sensitivity. The model was used to evaluate the explosion risk of polyethylene dust samples with different particle sizes. It was found that the risk level of dust explosion increased with decreasing particle size, which was consistent with the actual results. The risk assessment method can provide a scientific basis for dust explosion prevention in the production of polyethylene.     

除尘管道内木粉尘爆炸压力传播规律研究

为了探明除尘管道中粉尘爆炸压力的传播规律,利用自制通风除尘管道爆炸特性测试装置进行试验。研究结果表明:整个管道中粉尘爆炸压力波的传播过程可以分为自由传播阶段、管壁反射阶段和一维传播阶段;压力波在传递过程中处于边移动边生长的状态,具有压力累积效应;除尘管道中粉尘爆炸压力波幅及平均升压速率均与粒径呈负相关关系,二者随浓度变化呈现先上升后下降的趋势;利用Matlab分析了浓度、粒径对压力波的交互效应,表明二者交互作用显著。     

Development of an organizational framework for studying dust explosion phenomena

To develop a predictive dust explosion model or theory many considerations of the interaction between several complex multiscale processes are required. Due to practical considerations only some of the processes may be fully resolved, while the rest must be approximated or neglected. The current study focuses on constructing an organizational framework for dust explosion model development. The framework is organized based on progression of the explosion in time and geometric scale of the important features. Suggested methodologies are given to investigate the small-scale features and develop feed-forward approximations for predictive models at the larger system-scale. The concepts developed through constructing the organizational framework are applied to closed volume dust explosion testing and classification of several sources of experimental variance for this system is given.     

Experiment-based investigations of magnesium dust explosion characteristics

An experimental investigation was carried out on magnesium dust explosions. Tests of explosion severity, flammability limit and solid inerting were conducted thanks to the Siwek 20 L vessel and influences of dust concentration, particle size, ignition energy, initial pressure and added inertant were taken into account. That magnesium dust is more of an explosion hazard than coal dust is confirmed and quantified by contrastive investigation. The Chinese procedure GB/T 16425 is overly conservative for LEL determination while EN 14034-3 yields realistic LEL data. It is also suggested that 2000-5000 J is the most appropriate ignition energy to use in the LEL determination of magnesium dusts, using the 20 L vessel. It is essential to point out that the overdriving phenomenon usually occurs for carbonaceous and less volatile metal materials is not notable for magnesium dusts. Trends of faster burning velocity and more efficient and adiabatic flame propagation are associated with fuel-rich dust clouds, smaller particles and hyperbaric conditions. Moreover, Inerting effectiveness of CaCO₃ appears to be higher than KCl values on thermodynamics, whereas KCl represents higher effectiveness upon kinetics. Finer inertant shows better inerting effectiveness.