Water separator shows potential for reducing respirable dust generated on small-diameter rotary blasthole drills

Drilling with water has the potential to significantly reduce the respirable dust concentrations generated from small-diameter rotary drills when drilling blastholes on surface mining operations. However, water adversely affects tri-cone drill bits commonly used in surface drilling operations, causing excessive wear and premature replacement. Consequently, dry drilling with a dust collector system has the most widespread use in the industry. Tests have been conducted by the National Institute of Occupational Safety and Health (NIOSH), Pittsburgh Research Laboratory (PRL) on a newly designed device for smaller diameter drills that separates the water from the bailing air before it reaches the bit and thus provides the cost benefit of dry drilling while providing the benefit of wet drilling for dust suppression. The water that is delivered to the hole with the bailing air is separated from the air by a proprietary mechanical device that is encased in a drill sub (short section of drill rod/pipe) located immediately behind the cutting bit. A cascade cyclone and a real-time dust monitor were used to sample dust emissions from the holes. Dust concentrations and silica content were measured when drilling dry versus drilling wet. The tests show that drilling with this water separating sub can reduce both measured dust emissions from the boreholes and visible dust around the drill rig.     

CJ系列高效湿式除尘器在司家营铁矿的应用

针对司家营铁矿破碎车间原水浴除尘器效率低、风量不足的设计缺陷,通过加装CJ型高效湿式除尘器降低粉尘浓度,改善了工人的劳动环境,降低工人患职业病的几率,同时由于清洁的环境使部件寿命得到了提高。     

孔口除尘系统在李子垭煤矿的应用

通过对钻孔防尘现状及存在问题分析的基础上,介绍了一套新型的孔口降尘系统,该套系统通过在李子垭煤矿的现场应用和考察,有效抑制了干式钻孔的粉尘污染问题,大大改善工人的工作环境,为大力推广干式钻孔奠定了基础。     

静电除尘器与布袋除尘器经济性分析

随着新环保标准的执行,静电除尘器要达到排放标准,就必须采用4电场以上的除尘器。此时静电除尘器的初期投资、运行电耗都比布袋除尘器高得多,另外,每年静电除尘器的排污费比布袋除尘器至少还要高出上百万元到几百万元。     

抽放负压干式钻孔除尘器的研制及应用

现在矿井多采用压风排碴技术施工抽放钻孔,在作业时存在煤尘飞扬,对作业场所产生了重大安全隐患。为解决此问题,经过不断的摸索,在原有除尘器基础上,进行研究改进,逐步研制出一套抽放负压干式钻孔除尘器,通过现场实践运用,取得了非常好的效果,消除了安全隐患,创造了良好的作业环境。     

采煤机割煤粉尘治理关键技术及装备研究与应用

针对采煤机割煤过程中的粉尘污染问题,遵循“先抑、后控、再降”的治理思路,提出了利用高效抑尘喷雾快速湿润破碎煤体,再利用控尘喷雾控制含尘气流沿煤壁一侧运移,最后利用机载喷雾引射除尘器沉降粉尘的综合治理措施。采用实验室实验和现场试验相结合的方法,重点开展了支架顶部组合喷雾抑尘、采煤机喷雾控降尘、采煤机机载除尘等关键技术及装备的研究,并在高产尘强度综采工作面进行了应用,将采煤机正常割煤时司机处的总粉尘质量浓度由3 097.0 mg/m³降至52.6 mg/m³,取得了显著的降尘效果。     

旋风收尘器的改进与分析

通过分析各种粉尘收集的方法,得出了收尘的实质;从能量消耗的角度,通过改进收尘器表面结构,提高了旋风收尘器的各项性能指标,在实际应用中取得了明显效果     

静电除尘器内二维稳定浓度场的数值模拟

为探究除尘系统流场分布情况以及粉尘与液滴颗粒对除尘系统性能的影响,运用Fluent模拟研究气态单相流、气固两相流和气固液三相流的流场分布情况,分析除尘器在不同工况条件下压力与流场分布规律以及颗粒的运动情况。结果表明：除尘系统流场主要受除尘器结构的影响,受粉尘颗粒的影响较小;液滴颗粒的存在会提高系统的除尘效率;加入液滴颗粒后,粉尘运动凌乱度增强,与液滴碰撞作用加强,促进了细微粉尘的凝聚,但同时会影响除尘器流场稳定性,增加除尘系统阻力损失。     

新型孔口除尘器研究及应用

针对目前矿井干式打钻时粉尘浓度严重超标,严重威胁施工人员职业健康和矿井安全生产问题,研究开发了新型的孔口除尘器。该产品采用水环真空泵做动力,处理气体不受瓦斯浓度的限制,负载能力强,集多种除尘原理于一体,操作简便,易于维护。通过实验室试验研究和现场工业性试验证明,除尘效率在90%以上,大大的减少了打钻时产生的粉尘,对保障煤矿工人的职业健康和矿井安全生产将起到非常积极的作用。     

基于粉尘在线监测的火电厂自动除尘系统设计

选用先进的湿式湍流除尘器,将粉尘自动检测系统与除尘设备和输煤线路自动喷淋装置相结合,设计了一套基于粉尘在线监测的火电厂自动除尘系统。该自动除尘系统经调试,满足了TJ36-79《工业企业设计卫生标准》等的要求。     

矿用气动湿式孔口除尘器的研发及应用

针对煤矿井下干式钻孔粉尘污染问题,研究了集本质安全、轻便、小型于一体的新型矿用气动湿式孔口除尘器。在对影响除尘效果的主要因素进行试验分析研究的基础上,对关键动力元件,即空气引射器进行了系统深入的研究,并对除尘器的主要性能进行实验室和工业性试验,试验结果表明：该除尘器总粉尘除尘效率分别达99.1%和98.6%,呼吸性粉尘除尘效率分别达94.1%和93.2%,有效保障了矿井安全生产。     

塑烧板除尘器过滤与清灰性能研究

塑烧板由于其过滤精度高、使用寿命长等优点,近年来受到了工业除尘的关注。 脉冲喷吹是除尘器最常用的清灰方式之一,探索脉冲喷吹塑烧板除尘器的清灰性能可以为其工业应用提供理论基础和技术支撑。 将塑烧板作为研究对象,采用粉尘排放浓度监测仪以及压差计,分别测试了塑烧板除尘器粉尘排放浓度以及系统阻力,结合流体力学、环境科学等理论知识对塑烧板除尘器过滤清灰性能进行了实验研究。 实验结果表明:当脉冲间隔为 10 s,喷吹压力为 0. 4~ 0. 5 MPa,塑烧板收集高岭土和勃姆石稳定运行的过滤风速范围分别为 0. 6 ~ 1. 0 m / min、0. 6 ~ 0. 8m / min,设备稳定阻力值的范围分别为 155~ 520 Pa、325~ 500 Pa(气固浓度为 15~ 45 g / m³),粉尘排放浓度远远小于 1mg / m³,能实现超低排放。 实验结果对塑烧板除尘器的工业使用推广提供了理论指导以及技术支撑作用。     

超声波在旋风除尘器中的应用研究

着重论述煤尘产生的原因及粒度 ,介绍了超声波捕捉煤尘的工作原理和超声波除尘器优点。     

MGX型旋风除尘器的设计和应用

介绍了MGX型旋风除尘器的结构特点、设计计算、结构参数的选择及其应用的情况。     

选煤除尘装置在永锦选煤厂的研究与应用

选煤设备精煤离心机卸料由于离心力作用带有很大的甩风,导致皮带转载点洒落精煤,精煤随气体洒落形成煤尘,影响环境质量,造成精煤损失。河南永锦选煤有限公司自主研发的新型选煤除尘装置能够对煤尘进行收集、过滤并继续利用,使用成本低,操作方便,除尘效果好,除尘效率高,降低精煤损失。     

An expanded model for predicting surface coal mine drill respirable dust emissions

Overexposure to airborne respirable crystalline silica dust can cause disabling or fatal respiratory disease, and mine worker exposure to silica dust continues to be an ongoing occupational health concern. Exposures of surface coal mine rock drillers to respirable crystalline silica are of particular concern. On surface coal mine drills, bailing air flushes the cuttings out of the drill hole. Conveyor belting material is typically used to fabricate a shroud around the drill deck in an effort to contain the drill dust so that it can be captured by a collector. Dust leakage from the drill shroud is usually the worst dust source problem on most drills. The focus of this work is drill shroud dust leakage and the relationships of various drill parameters on this leakage. Experimental data were obtained and used in combination with dimensional analysis to establish these relationships. In general, it is found that airborne respirable dust (ARD) concentrations vary in a direct relationship with shroud leakage area and in an inverse relationship with drill deck cross-sectional area and shroud height. This work expands the testing and dimensional analysis previously reported for collector/bailing air flow ratios ranging from 2:1 to 4:1 to include ratios approaching 1:1. A semi-empirical mathematical model has been developed and expanded to describe ARD generation on surface coal mine drills. Geometric parameters included are drill deck height and cross-sectional area, shroud leakage associated with the deck shroud, and the operational parameters of bailing airflow and dust collector airflow. The relationships can be described by logarithmic functions and yield predictive ARD values, which fall in the range measured on operating drills for collector/bailing air flow ratios greater than 2. However, at values of collector/bailing air flow ratios of approximately 1.1, the amount of ARD shows minimal response, if any, to drill deck shroud improvements that do not result in near-perfect seals. This is a condition that can occur in actual operation and is a substantially different result than previously expected and reported. Application of these results should provide mine operators with sufficient information to determine (1) the relative magnitude of their dust emissions, (2) where they should focus their efforts to reduce ARD emissions and (3) the improvement they could reasonably expect to achieve. Given that exposures of surface coal mine rock drillers to respirable crystalline silica are of particular concern, substantial reductions of airborne silica dust during drilling may be estimated and achieved through use of the analysis presented.     

潜孔钻机干式除尘系统改造

对KQ— 150型潜孔钻机干式除尘系统的局部结构进行了改进设计 ,改善了钻机的除尘性能 ,取得了良好的社会效益和经济效益     

压气引射孔口除尘器的设计与应用

针对当前干式钻进时孔口降尘、除尘存在的问题,介绍了一款压气引射孔口除尘器,并对其结构组成、工作原理、安装、除尘系统布置以及该除尘器在某矿的现场试验情况进行了详细的介绍。根据无降尘、除尘措施和使用除尘器时孔口下风侧粉尘质量浓度的对比数据,证明该除尘器可有效抑制干式钻进孔口的粉尘污染问题,极大地改善了工人的工作环境。     

脉冲滤筒除尘器对超细粉体的净化

利用脉冲滤筒除尘器对粒径分布为0.5～5 μm的超细粉体进行净化试验。测试了除尘器净化效率、除尘器阻力及过滤风速等主要性能参数。试验结果说明：脉冲滤筒除尘器对于粒径为0.5～5 μm的超细粉体,在过滤风速为0.8～1.25 m/min时,除尘器阻力小于300 Pa;过滤风速为2.8 m/min时,阻力小于1 200 Pa,净化效率达99.999 7％。该脉冲滤筒除尘器具有除尘效率高,阻力损失低,节约除尘系统的动力消耗的优点,有利于在超细粉体净化工艺中的应用。     

气动孔口除尘系统在龙滩煤矿的应用

针对龙滩煤矿干式钻孔粉尘污染问题,应用了气动湿式孔口除尘技术。文章介绍了该系统的组成及主要特性,并对该系统在龙滩煤矿的现场应用及降尘效果进行了考察,降尘效率均在97%以上。该系统在龙滩煤矿的成功应用为治理煤矿井下干式钻孔粉尘污染问题提供了技术支撑,为煤矿工人的职业健康和煤矿的安全生产提供了有利的保障。