HPF法脱硫工艺在重钢焦化厂的应用

本文介绍了以焦炉煤气中自有的NH3为碱源，在HPF催化剂的催化作用下，脱除煤气中的H2S和HCN。该工艺通过在重钢焦化厂的应用，其工艺可行，脱硫效率较高可将H2S从7～8g/m^3脱至200mg/m^3以下。同时该装置还存在部分不足，有待进一步改进和完善。     

4MN热剪机压料装置故障分析及改进

马钢初轧厂４ＭＮ热剪机是６ＶＨ连轧机的配套设备,该设备为六连杆下切式剪切机,该剪切机自投产以来曾多次出现过压料装置中的拉杆断裂和拉杆与压板轴之间松脱等事故,从而靠轧线停产,本文通过对该剪切机的运动状况和压料装置几种受力情况的力学分析,阐述了剪切机压料装置的损坏原因以及改进措施。     

电除尘器在宣钢烧结机的应用

宣钢烧结厂一烧烧结机机头由多管除尘器改造为三电场高效电除尘后,采用预荷电技术、阴极线防粘涂层、进风口气流均匀分布及出风口迷宫型收尘装置设置等技术,粉尘排放浓度由400mg／m^3降至150mg／m^3,达到了国家粉尘外排标准,保证了改造后的电除尘稳定达标排放。     

烧结机机尾系统保温密封除尘综合改造

烧结机尾部密封罩强度低、易变形，密封效果差，造成卸料扬尘严重。采取增设保温密封小车、前部保温密封段由2m加长到10m、密封罩下部增设导料装置等措施进行改造，环境粉尘由原220mg／m^3降为30mg／m^3，尾部的抽风温度由原71℃提高为84℃，提高了设备作业率，增加了产量，年回收粉尘(矿粉)资源达365t，解决了环镜污染问题。     

莱钢3^#3200m^3高炉鼓风脱湿装置

莱钢3^#3 200 m^3高炉采用脱湿鼓风,风机进口采用自洁式空气过滤器与脱湿器直连相连的组合布置方式,降低了整个系统的阻损,脱湿工艺流程由气路系统、冷水系统、冷却水系统等部分组成。使用该装置后,降低焦比0.8 kg/t,每年多喷煤2万多t,且降低了风机耗电量,年净利润约4 800万元。     

XWD40型电除尘器技术改造

针对XWD40电除尘器因设计缺陷及构件磨损等原因造成的除尘效率低的问题，济钢第二烧结厂对气流分布装置、极线、密封保温门、绝缘套筒等关键构件进行了技术改造。电除尘器改造后运行效果良好，消除了极板挂灰、电晕极变形、漏风等现象，测试表明，烟气排放量1^#机由235mg／m^3降为24mg／m^3，2^#机由280mg／m^3降至58mg／m^3；电场气流顺畅，相配套的两台No18D除尘风机电流由290A降为220A。     

本钢5号高炉大修设计采用的新技术

本钢5号高炉大修衬时将炉容由2000m^3扩大到2600m^3.这次大修采用了PW无料钟炉顶、钢冷却壁和INBA炉渣处理等先进技术。     

环缝洗涤工艺在水钢1350m3高炉煤气除尘中的应用

水钢1350m^3高炉煤气清洗系统采用环缝洗涤工艺,该工艺具有洗涤水耗量低、设备维护工作量小、设备占地面积省等特点,投产净煤气含尘量小于5mg/m^3,机械水含量小于7g/m^3。据现场调试经验,建议对环缝洗涤器增加窥视镜或检测设备,以确定注油量。     

料层透孔装置在莱钢265m^2烧结机上的应用

简要介绍了料层透孔装置的设备结构及工作原理。该装置在莱钢265m^2烧结机上应用后,烧结料透气性得到改善,有利于烧结矿产量的提高,值得推广应用。     

多流槽BRCU无料钟炉顶设备开始在高炉上推广应用

由达涅利康力斯和TOTEM公司共同推出的新型多流槽无料钟炉顶设备已开始在高炉上推广应用。该设备已在俄罗斯西西伯利亚钢铁公司3000m^3高炉和2000m^3高炉上工作12年，在印度京德勒800m^3高炉和印度比莱钢厂1033m^3高炉工作了6年，至今运行良好。多流槽BRCU无料钟炉顶具有设备结构简单可靠、投资低、设备维护量小、     

收尘系统电滤器技术改造实践

在分析韶关冶炼厂Ⅱ熔炼冲渣收尘系统电滤器阴极电晕线经常烧断原因的基础上,通过电晕线更型及其安装方式的改进、更换供电装置以适应电滤器运行、增设瓷质异鞍环、喷雾调节烟气湿度等措施,延长了电晕线的使用寿命,电滤器能有效治理高比电阻烟尘,排放烟气含尘由180 mg/m3(均值)下降到5 mg/m3(均值),除尘效率达99.7%以上。     

烧结机尾除尘改造

莱钢1#105m2烧结机通过增加1级121m2电除尘器,设计选用滤料和袋笼,改善供气系统,控制除尘清灰,改造集气罩、除尘管道等措施,将机尾电除尘器改造为电袋复合除尘器。改造后,实现了粉尘达标排放,粉尘排放浓度30mg/m3以下,布袋的完好率保持在99%以上,年节约运行费用47.5万元。     

Measurement of airborne fumes in welding factories

Concentrations and size distributions of airborne welding fumes in work environments were measured. Samples were collected from 20 workplaces in 13 companies. In all workplaces, the stationary samplings including A-sampling and B-sampling and the personal sampling were carried out simultaneously. The fume concentration in the stationary sampling was measured with a digital dust monitor. A low volume air sampler and an Anderson cascade impactor was also used to determine the conversion factor of the values obtained by the digital dust monitor and the size distributions of the fumes. The personal exposure levels were measured with a TR sampler and a personal cascade impactor. The concentrations by the personal sampling (average: 11.3mg/m3) were much higher than those by the A-sampling (average: 0.4mg/m3 and range: 0.15-0.64mg/m3) but lower than those by the B-sampling (average: 46.8mg/m3, range: 0.66-152.8mg/m3). The mass median aerodynamic diameter (MMAD) of the stationary and the personal samplings were 2.41 microns and 0.80 microns, respectively. Fumes were observed under a scanning electron microscope. Most of the fume particles were sphere in shape but smaller fumes were aggregated and formed larger secondary particles.     

焦化厂备煤车间的煤尘治理

采用ＬＴＨＦ１４４－５１０型机械回转反吹袋式除尘器，代替原有设备，对薛城焦化厂备煤车间的除尘系统进行更新改造，经过１年多的实际运行，粉尘排放浓度为３７．６ｍｇ／ｍ３，车间岗位粉尘浓度１．９～２．３ｍｇ／ｍ３，分别比国家排放标准降低了６２．４ｍｇ／ｍ３和８．１～７．７ｍｇ／ｍ３。     

Nature and amount of aerial pollutants from livestock buildings

The air in animal housing contains gases, odours, dust particles and microorganisms which are discharged by way of the ventilation system into the environment. There is increasing concern within parts of the population that these compounds may affect the respiratory health of people living close to livestock enterprises. A brief survey is presented on airborne emissions from livestock buildings. About 136 gaseous compounds are analysed in animal house air of which only 22 are quantified. The most environment-related compounds are ammonia and methane. It is assumed that German animal husbandry emits up to 750,000 Mg ammonia per year. The concentrations of airborne microorganisms in livestock buildings are between some 100 and several 1000 per liter. Staphylococcae, streptococcae, colilike bacteria, fungi, moulds and yeasts are regularly found. The 24 h average concentrations of dust in animal barns vary considerably. In poultry houses the highest inhalable resp. respirable dust concentrations (up to 10 mg/m3 resp. 1.2 mg/m3) were found, followed by pig houses (5.5 mg/m3) and cattle barns (1.22 mg/m3 resp. 0.17 mg/m3). The concentrations of endotoxins in the airborne dust can range from 0.6 ng/m3 (cattle, respirable dust) to 860 ng/m3 (laying hens, inhalable dust). The presently discussed occupational health threshold at the workplace is around 5 ng/m3 (50 EU/m3). The emission rate for respirable dust from piggeries is at about 60 mg/h, from poultry houses nearly 300 mg/h and from cattle barns at 20 mg/h, related to 500 kg liveweight of the animals. Little is known about the distances these particles are transported through the air outside the animal buildings.     

Emission of particulates from a pig farm with central air exhaust in the pig stall

There is increasing concern that airborne dust and particulates from animal enterprises which are emitted into the environment may impair the health of people living in nearby residential areas. Investigations were carried out to trace the distribution of particulate emissions from a piggery in the vicinity by means of an aerosol lidar. Additionally, dust was sampled with a high volume impactor (HVS) at two places downwind (50 m, 115 m) and at a reference point 50 m upwind the piggery. The total dust concentraction in the animal house air varied between 0.2 and 1.0 mg/m3 within 24 hours. 50 m downwind the building 0.08 mg/m3 dust was measured by means of the HVS. At a distance of 115 m downwind the same concentrations (0.037 mg/m3) as the reference point (0.037 mg/m3 upwind the animal house were found. The endotoxin concentrations were 60 ng/m3 (50 m downwind), 15 ng/m3 (115 m downwind) and 9 ng/m3 (50 m upwind). The lidar signals discriminated clearly between the density of the air directly above the exhaust chimney and the 115 m downwind position. It seems that the lidar technique in combination with high volume impaction form an useful tool to describe the distribution distance of particulate pollutants farm animal housing.     

烧结机机头除尘器改造

因与 3 6m2 烧结机配套的机头除尘器易堵塞、难拆装维护、除尘效果差 ,改造采用ST -XF型高效多管除尘器取代原老式 2 88管除尘器 ,实现了二级除尘。应用表明 ,排放烟气中的含尘量由 187mg/m3降为 94mg/m3,风机叶轮平均寿命由 180天延长至 60 0天 ,年效益可达 180万元。     

Comparison of respirable coal mine dust concentrations measured with an MRE and a newly-developed, two-stage impactor sampler

The design and laboratory evaluation of a two-stage aerosol sampler using an impaction plate for removing particles above 10 micron, has been reported. The unit was developed to provide an alternative to the two-stage sampling head used on approved coal mine personal respirable dust samplers. The new device offers the potential of increasing the analytical accuracy of samples, and of providing a device more suitable to the mining community for use in their mandated dust sampling program. This paper describes the underground sampling program conducted to establish the factor for converting respirable dust concentrations measured with this device to equivalent concentrations measured with an Isleworth 113A gravimetric dust sampler (MRE). This study demonstrated that the use of the impactor sampling head provides a viable alternative to the currently used sampling head. The results showed that comparative measurements could be linearly related for MRE dust measurements ranging from 0.5 to 5.5 mg/m3. The factor determined for converting measurements made with the new head to equivalent MRE measurements was approximately 0.5.     

胶带运输巷道粉尘分布规律及其控制

通过对245胶带运输巷道内粉尘浓度的现场测定与分析,发现转载点和落矿点的粉尘浓度严重超标。为此,建立井下运输巷道的物理模型,采用Fluent软件对胶带运输巷道粉尘运动进行数值模拟研究,确定了巷道内粉尘运移规律。结果表明:当平均风速为3 m/s时,巷道内粉尘浓度最低; 巷道内粉尘浓度大小与胶带运行速度成正比。根据数值模拟的结果,结合某大型金属矿山的实际情况,制定了一套适用于胶带运输巷道的降尘措施。该措施实施后,胶带运输巷道内粉尘浓度最大的落矿点处由60.5 mg/m3降低到9.5 mg/m3,降尘效果显著,巷道内作业环境得到较大改善。      

高炉环保除尘工艺

宝钢在高炉建设时根据产生灰尘和烟尘源的大小,设置一定能力的通风除尘设施;在烟气产生量最大的炉前作业区域铁口前设置一次除尘设施,在区域上方设置二次除尘设施。强调在生产过程中需要对除尘点进行动态风量分配调整,针对宝钢多年来除尘设备使用和管理的问题,提出了较详细的改进意见。目前宝钢高炉出铁场、原料焦矿槽环境降尘年平均小于3 mg/m3,远低于10 mg/m3的国家环保标准;高炉分厂环境降尘量平均小于13 t/(月.km2)。