高炉矿槽槽上除尘的实践

本文通过对1260m~3高炉炉前矿槽槽上的除尘实践,总结出了移动式胶带卸矿粉尘治理的经验,为今后新上高炉矿槽的除尘和原有移动式胶带卸矿的除尘技术改造提供参考,同时也为建立成熟的矿槽槽上除尘技术奠定了基础。     

鞍钢炼铁总厂10#高炉主矿槽除尘

分析了原鞍钢10^#高炉主矿槽除尘系统存在的问题及其原因，介绍了应用覆膜滤料，回转切换定位喷吹清灰装置及三状态阀等先进技术成功改造原SDFL型大布袋除尘器和气力输灰技术成功应用在大型多灰斗袋滤器输灰的工程实例。     

钢铁企业矿焦槽除尘超低排放改造方案分析

探讨了布袋除尘器超低排放改造的主要措施,并基于钢铁企业的矿焦槽除尘超低排放改造工程,介绍了四种改造方案:串联除尘箱体、并联除尘器、加高除尘器、改变滤袋形状。分析了各种改造方案的利弊,推荐在扩容比例较高时优先选择改用褶皱滤袋的方案,并简要阐述了超低排放改造的效益。     

矿料槽上环境除尘的设计及应用

矿料槽上卸料由移动小车完成,车间内具有尘源点多、粉尘浓度高、各类粉尘混杂等特点,这些粉尘影响职工身心健康,污染周边环境,同时也会导致矿料的大量风蚀,给企业带来一定的经济损失.文章对矿料槽上粉尘产生的原因、特点进行分析,阐述了矿料槽上环境除尘设计的技术要点.     

火电厂原煤输送系统除尘系统改造

针对某火电厂原煤输送系统粉尘污染问题,对原煤输送系统流程及除尘方式进行分析,找出粉尘源及原有除尘系统的不足,运用复膜扁布袋除尘器配合双侧密封可调弓形导料槽加水喷雾的综合治理方法有效解决粉尘污染问题。     

矿槽卸料车变点下料动态密封装置的设计及其通风除尘方法浅析

论述了移动式卸料车变点下料时动态密封装置的设计特点及其适用性,并总结出了一套行之有效的矿槽通风除尘的综合方法,可为类似工程提供参考。     

地面除尘站在焦化厂出焦除尘的应用

通过对5种出焦除尘工艺的比较,确定了地面除尘站工艺。阐述了地面除尘站工艺的工艺流程和除尘系统组成,分析了出焦除尘的社会效益和经济效益。     

钢铁企业除尘系统设计节能探讨

分析了钢铁企业除尘系统的能耗,给出了除尘系统设计的有效节能途径,包括选择合理的除尘方式和系统布置形式等.     

棉纺厂除尘现状调查与除尘技术改造

本文将江苏省大、中型棉纺厂除尘现状调查做了综合介绍,找出了问题并初步明确了今后除尘系统技术改造和日常管理的方向.     

除尘脱硫系统改造

为了保证二氧化硫的总排放量要下降10％,对除尘脱硫系统进行了改造,采用气动旋流组合式除尘脱硫技术,并加强运行管理,达到了除尘脱硫的预期效果,实现了减排目标。     

基于LabVIEW 的爆破板应变研究方法

为研究爆破板在粉尘爆炸时的应变,实现全智能化控制和采集,设计了一种基于LabVIEW的爆破板应变研究方法。该方法利用惠斯通电桥将布置在爆破板上应变片的应力变化转换为电信号,同时通过LabVIEW软件、数据采集卡等使红外相机、高速相机和压力传感器的工作同步,实现了爆炸过程中罐内爆炸压力、爆破板应变数值与该时刻爆破板图像的对比分析。实验结果表明：该方法满足同步性、多样性、准确性等实验要求,具有模块化程度高、实时性强、可扩展性好的特点,有助于改进爆破板的结构。     

CFD modelling of ventilation and dust flow behaviour above an underground bin and the design of an innovative dust mitigation system

To mitigate dust contamination in the mine intake roadway, Computational Fluid Dynamics (CFD) study was first conducted to understand the ventilation and respirable dust flow behaviour above the bin. Based on the modelling results, two possible solutions were proposed for dust control, one is modifying the ventilation system to dilute the respirable dust particles, and the other is using water mist dust droppers to suppress and capture the majority of the dust particles. Modelling results indicated that respirable dust particles could be significantly diluted at the operators’ breathing level by increasing the ventilation volume from the horizontal air intake, where 10–13 m³/s of air flow rate was suggested to be a preferable quantity. The mechanism of respirable dust capture using water mist was investigated from classical theory and two phase flow theory, respectively, both of which demonstrated a good dust mitigation effect was achievable. CFD models were employed to investigate the flow behaviour of water mists when sprays were oriented at different directions above the bin. An innovative design of dust control system employing water mist technology with four nozzles was proposed and subsequently built for field implementation. An independent field dust evaluation demonstrated that a reduction up to 68% of respirable dust particles has been achieved in the vicinity of the underground bin, and an average of 40% respirable dust reduction along the belt roadway. The successful application of the new dust mitigation system also demonstrates its potential use in underground longwall faces, roadway development and subsurface tunnel excavations by roadheader.     

城市扬尘污染的研究现状及展望

论述了城市扬尘污染日趋严重的形势,指出引起城市扬尘污染的主要来源和扬尘对现代城市环境和人群健康造成的各种危害,介绍了国内外控制城市扬尘污染的方法,提出了我国扬尘污染治理面临的问题,对加强扬尘治理提出建议和展望。     

我国工业粉尘爆炸事故统计及趋势分析

为了研究空间、时间、事故次数和可燃性粉尘种类等事故相关因素的特征,总结我国粉尘爆炸事故发生的一般规律,对我国 2005-2018 年发生的粉尘爆炸事故进行了数据统计分析。结果表明,我国粉尘爆炸事故多发于浙、苏、粤等工业发达地区;夏冬季、交接班时刻及人体机能下降期为事故高发时间段;金属粉尘、木粉尘和食品粉尘是发生爆炸的主要粉尘,其中金属粉尘是粉尘爆炸事故的最主要类别,事故起数占比高达 45.24%。研究结果有助于更有针对性地预防和控制粉尘爆炸事故,促进我国工业安全生产。     

The effect of cleanliness control during installation work on the amount of accumulated dust in ducts of new HVAC installations

The aim of this study was to evaluate the amount of dust in supply air ducts in recently installed ventilation systems. The samples for the determination of dust accumulation were collected from supply air ducts in 18 new buildings that have been constructed according to two different cleanliness control levels classified as category P1 (low oil residues and protected against contaminations) and category P2, as defined in the Classification of Indoor Climate, Construction and Building Materials. In the ducts installed according to the requirements of cleanliness category P1 the mean amount of accumulated dust was 0.9 g/m2 (0.4-2.9 g/m2), and in the ducts installed according to the cleanliness category P2 it was 2.3 g/m2 (1.2-4.9 g/m2). A significant difference was found in the mean amounts of dust between ducts of categories P1 and P2 (P < 0.008). The cleanliness control procedure in category P1 proved to be a useful and effective tool for preventing dust accumulation in new air ducts during the construction process. Additionally, the ducts without residual oil had lower amounts of accumulated dust indicating that the demand for oil free components in the cleanliness classification is reasonable.     

电石破碎除尘系统的优化设计

结合工程实例介绍了电石破碎厂房、尘源控制与集气吸尘罩设计、除尘器选型和除尘系统的设计。使用情况表明,系统运行正常,达到了设计要求。     

The influence of soil remediation on lead in house dust

Lead in house dust has long been recognized as a principal source of excess lead absorption among children at the Bunker Hill Superfund Site (BHSS) in northern Idaho. House dust lead concentration from homeowner's vacuum cleaner bags has been monitored since the epidemic of childhood lead poisoning in 1974. Geometric mean house dust lead concentrations decreased from >10000 mg/kg in 1974 to approximately 4000 mg/kg in 1975, in response to air pollution control initiatives at the defective primary lead smelter. After smelter closure, 1983 mean dust lead concentrations were near 3000 mg/kg and were most dependent on soil sources. Following emergency soil removals from public areas and roadsides and fugitive dust control efforts in the mid-1980s, house dust lead decreased by approximately 40-60% to 1200-1500 mg/kg. In 1992, a cleanup goal of 500 mg/kg dust lead community average, with no individual home exceeding 1000 mg/kg, was adopted. This goal was to be achieved by a combination of contaminated soil removals and fugitive dust control efforts throughout the 21 square mile BHSS. Continual reductions in house dust lead concentrations have been noted throughout the residential area soil cleanup. Geometric mean house dust lead concentrations averaged approximately 500-600 mg/kg from 1996 to 1999 and dropped below 500 mg/kg in 2000. Analysis of these data indicates that approximately 20% of the variance in dust lead concentrations is attributed to yard, neighborhood, and community soil lead concentrations. Since 1996, dust lead concentrations and dust and lead loading rates have also been measured by dust mats placed at entryways into the homes. Neighborhood soil lead concentrations, household hygiene, the number of adults living in the home, and the number of hours a child spends outdoors in summer explain approximately 26% of the variance in mat dust lead loading rates. It is estimated that post-remedial house dust lead concentrations will stabilize at 400-500 mg/kg, as compared to approximately 200 mg/kg in socio-economically similar background communities; the difference possibly attributed to residual soil concentrations (3-6 times background), recontamination of rights-of-way, tracking of non-residential mining district soils and dusts, fugitive dusts associated with the remediation, and residual structural or carpet dusts.     

Experimental study and implementation of a novel internal foam spraying system for roadheaders

Foam technology utilizes the good coverage of foam to form a closed space around dust sources. The foam then wets the dust particles, causing them to adhere before they spread into the air, resulting in better dust control than with water sprays. In the process of foam dust control at a heading face, the foam spray trajectory is highly influenced by the wind, making it difficult to focus foam on the dust sources, which wastes the foam and reduces dust control efficiency. To resolve this problem, the idea of transporting foam to the cutting head through the roadheader’s inner pipeline is proposed. To adapt to the high resistance of foam delivery in the roadheader’s inner pipeline, according to the water and air supply of the heading face, a table water-jet suction device and porous spiral coupling foaming device were designed, and the working conditions were tested using a self-designed experiment system in the laboratory. The results showed that the foaming agent could be automatically added into the device at a working water flow rate of 1–1.6 m³/h at a ratio of 1%. The optimum air flow was 45–50 m³/h, in which range the foam expansion ratio reached the maximum and the outlet pressure demand was satisfied. Field application showed that the new foam method had a better dust control efficiencies than traditional foam methods.     

谈电厂内输煤系统粉尘问题

介绍了粉尘的概念,对火力发电厂运煤系统粉尘产生的原因进行了分析,并提出了粉尘的综合治理措施,指出粉尘治理需从卸煤、转运、储存、破碎和输送等各个环节入手,同时需采用相应的配套设施。     

谈城市建筑施工扬尘治理措施

针对西安市建筑施工扬尘治理现状,从建筑施工扬尘产生的原因进行分析,有针对性的提出了治理措施,并对今后的扬尘治理工作提出见解,以期最大限度的改善城市环境空气质量。