Latest developments for dry and wet dedusting systems for converter steel making

Environmental requirements world wide and in the P.R.of China in particular have increased and authorities are increasing the pressure on steelmakers to comply with always more stringent limits and standards. Modern converter steel making goes along with the innovation and new developments not only for the primary converter process itself but even more for the dedusting technologies.This paper describes the benefits and latest development of advanced off gas cleaning and recovery systems based on dry type cleaning with electrostatic precipitation and wet type gas cleaning based on wet scrubbers.Modern converter dedusting is based on suppressed combustion systems in order to reduce off gas amounts and to be able to use the gas for gas recovery.The dry type primary off gas treatment system based on electrostatic precipitator technology is the most advanced environmental solution available for converter steel making.Dry dedusting has been introduced in China successfully with a significant contribution by Siemens VAI being the market leader for converter dry dedusting systems.Siemens VAI has introduced several design improvements over the last years such as CFD modeling of flow conditions in evaporation cooler,design of chains for dust conveyors,design of ESP inlet,design and thickness of discharge electrodes and operation in energy saving mode.Additionally the DDS process has been successfully implemented in China for the De-P process.The gas recovery system for DDS has been optimized over the years with high quality equipment and integrated automation and control systems.Wet type dedusting for converter gas is a well proven technology for many years and is still widely used due to the simplicity of the process and the lower investment costs.SVAI has continuously improved it's wet dedusting technologies to provide highly energy efficient systems which can achieve lowest levels of clean gas dust while still maintaining a moderate water and energy consumption with simplified process control and standardized process control packages.Main design and process improvements include expansion joints for connection of scrubber to cooling stack,new type of droplet separator,advanced hood pressure control package,ID fan washing system,ID fan speed control system etc.The focus for wet type gas recovery systems is still on maximum safety and reliability.SVAI has also successfully improved the technological packages for converter gas recovery for wet type dedusting systems.The comparison between the two system shows the advantages of dry dedusting mainly being the lowest clean gas dust content, lower operating costs,easier handling for recycling of residuals and no need for a water treatment plants.Wet type dedusting has it's main advantages in the simple process and operation of the system,the flexible layout solutions inside the steel shop as well as generally lower investment costs.An overview on the numerous reference installations for dry- and wet type dedusting systems in China as well as world wide is given.

Clean and efficient-optimization of EAF dedusting systems

Most of the electric arc furnace(EAF) dedusting systems installed worldwide have been designed and built with the mere intention to comply with certain environmental regulations and limiting values for a determined process and production capacity- and this usually works as long as those variables are fix.But reality shows thatever since the recent financial crisis- steel producers are perpetually forced to adapt their steelmaking process in order to meet the requirements of the market and properly react to its fluctuations(e.g.by flexible use of input materials).Many installed dedusting systems cannot live up to this challenge.Badische Stahl-Engineering GmbH (BSE) optimizes dedusting systems to meet various process requirements and thus increase the overall productivity and cost efficiency- along with the strict compliance with all environmental standards and local legislations.This paper further describes the basic considerations to be taken and the BSE approach to deal with these challenges, emphasizing it by examples of our latest projects world wide.

Design on Online Fault Diagnosis System of Stealmaking Gas Dedust Fan

The study introduces the meanings of the technology on dedust fan′s online detection and fault diagnosis,the ways of fault diagnosis,the common fault analysis and the design of stealmaking gas dedust fan′s online fault diagnosis.It shows the whole system′s design,establishment and functional test.XM series modules have been used to realize the online fault diagnosis.The system′s functional requirements are proved by experiment.

宝钢股份高炉煤气干法除尘与湿法除尘的选择

对高炉煤气除尘系统是选择干法除尘还是湿法除尘进行了探讨。以宝钢股份高炉煤气干法除尘与湿法除尘运行数据为基础,重点分析比较了煤气干法除尘与湿法除尘的TRT发电量及发电效率,提出了煤气干法除尘TRT发电效率低于湿法除尘的新观点。认为,传统观念中煤气干法除尘的发电量比湿法除尘增加30%,是建立在炉顶温度适宜,且TRT发电效率保持湿法除尘水平的基础上;宝钢股份高炉的运行数据表明,与煤气湿法除尘相比,干法除尘TRT电能转化效率低,同等条件下的发电量仅增加15.9%,而TRT发电效率低9.33%。

袋式除尘系统的节能措施

分析袋式除尘系统各环节对系统能耗的影响,提出节能措施。

关于煤电行业除尘除灰系统标准体系修订的探讨

首先阐述了“双碳目标”背景下煤电机组除尘、除灰系统的运行现状及面临的安全挑战,探讨了积极开展除尘、除灰系统相关标准修订工作的紧迫性和重要性。其次系统梳理了涉及除尘器、除灰系统和钢结构安全等国家、行业标准的使用现状,剖析了标准的空白缺位,以及标准之间存在的主要矛盾、不适应性等,并提出了除尘、除灰系统标准体系构建的总体框架,分析了标准体系修订的必要性及产生效益。最后围绕煤电行业除尘除灰系统标准体系的近期、中期和远期修订计划提出了针对性建议。

Experimental Study and Analysis on Performance and Dedusting Efficiency of Frothing Generator

By simulating test and study in laboratory, the structure and performance offrothing generator were determined. The relative curves between the frothing volume and gas velocityof foaming net, supplying liquid volume and the content of foaming agent were obtainedrespectively. There were an optimum gas-velocity of foaming net, an optimum supplying liquid volumeand an optimum content of foaming agent under the condition of the given material quality and shapeof foaming net and spraying form. The spraying froth is of a great assistance in collectingrespirable dust.

The Application of Cold Banding Technology for Dust Removed From BOF Gas Using Dry Dedusting Technology

Firstly, physical and chemical properties of dust removed from BOF gas are analyzed, and then the cold banding technology of dust removed from BOF gas and its application are introduced. Tests have proved that using cooled agglomerated pellets made of the dust removed from BOF gas and small amounts of modified starch as a coolant and slagging agent in steel production can bring about considerable economic, social and environmental benefits.

正负压复合除尘系统的节能优化研究

为解决目前矿山使用布袋除尘技术的振筛机因单负压口引起除尘阻力大和功耗高的问题,本文以河南万山现有除尘设备为模板对该设备进行正负压复合优化设计。通过采用正负压相复合除尘设计方案,从除尘设备阻力、功率、有效除尘体积比三个方面对振筛机的除尘效果及能耗展开研究。研究结果表明,不同方案对除尘效果和能耗的影响不同。结合几个指标综合判断,方案3为最优方案。与原始方案相比,方案3的有效除尘体积比增加1.2%,除尘阻力减少4.5 kPa,功率减少245 kW。

提升转炉余热回收及烟气净化系统效能的实践

介绍了转炉余热回收、烟气收集与净化等关键部位工作原理。基于重锤文氏管与强制循环法相结合的转炉系统,在实际生产中的蒸汽回收量、煤气回收浓度有明显提升,并且生产中除尘颗粒物浓度指数大幅降低。

高炉喷煤系统配加焦化除尘粉工艺设计

对高炉喷煤系统配加焦化除尘粉工艺设计要点进行了阐述。在总结分析宝钢、太钢焦化除尘粉利用工艺的基础上,提出了焦化除尘粉气力输送进磨煤机新技术,其设计要点一是除尘粉气力输送系统布置方式,二是磨煤机加人点的选取,与宝钢、太钢的工艺相比,该工艺在喷吹煤粉配比精度的控制方面具有明显优势。该工艺在某钢厂高炉应用2年多,喷吹煤粉的配比为50%烟煤+42%无烟煤+8%焦化除尘粉,高炉及喷煤系统没有出现不良反应,煤比保持在高位运行,重力除尘灰检测未发现明显变化。

一种基于S数的除尘管网调节计算方法

针对钢铁行业除尘管道的调节复杂,不合理调节阀门及风机频率易导致除尘管道积灰的问题,文章提出了一种基于管段阻抗S数的除尘管网调节计算方法,将除尘管网复杂的支状管网简化,可根据管网的阀门开度、三通、设计流量、管径等关键参数的输入,快速判断系统管网流体的分配及运行情况,该方法在保证除尘管道不积灰的情况下进行除尘系统的节能调节,为除尘智能管控提供节能运行决策依据。

浅谈袋装铁合金自动取样机应用实践

中南股份检测中心的5E-CPY型袋装铁合金取样机主要负责对袋装铁合金的机械取样。该机功能相对单一,仅有取样功能,未配备除尘系统,不具备袋装铁合金在线粒度检测功能。粒度检验只能通过人工筛分,效率低下。文章介绍了检测中心通过工程改造项目运用的一套先进袋装铁合金自动取样及粒度检验系统,解决了改造前袋装铁合金检验存在的问题,提升袋装铁合金质量检验装备水平,堵塞管理漏洞,改善作业环境和降低劳动强度,提高检验效率。

中天钢铁8#高炉煤气除尘系统存在的问题以及应对措施

中天钢铁高炉煤气除尘系统存在煤气含水率高、半净煤气管道堵塞以及滤袋糊袋等问题,导致高炉、布袋除尘器以及TRT运行不畅,通过对半净煤气管道粘结物、高炉入炉原燃料等进行取样化验以及对高炉顶温的分析,确认了导致这些问题的原因,并结合实际制定了相应的措施,为高炉的稳定生产提供了有利条件。

成品锯除尘系统的结构设计与内部流场分析

本文探讨了成品锯除尘系统的设计方法,为使粉尘排放浓度满足中国排放标准,采用了“旋风+袋式”除尘技术,然后建立了其三维虚拟样机模型。通过使用CFD流体分析软件对整个模型进行仿真分析,获得了该除尘系统内部流场的分布特性,所得到的风管流体参数结果也为风机选型提供了理论依据。进一步的结构优化表明,通过给吸尘罩增加分支管路和在收尘箱中加入导流板,使系统中的速度分布更加合理,从而提高该除尘系统的收屑能力。

燃煤锅炉低压脉冲布袋除尘系统的设计及优化

针对燃煤锅炉烟气的除尘,设计了一种低压脉冲布袋除尘装置,详述了其工作原理、组成及其结构优化。经过本装置除尘处理后,烟尘排放浓度低于20 mg m^(3),除尘效率达到99.99%以上。

皮带输煤巷中继站尘源特性及全自动气水雾化除尘系统研究

考虑高负载皮带输煤巷中继站粉尘浓度过高且尘源复杂的特点,以同忻矿主斜井中继站为研究对象,采用现场实测和实验分析相结合的方法对粉尘产生强度、浓度变化、粒径分布等特性进行研究分析,设计研发了基于多种传感器联合监测的全自动气水雾化除尘系统,并应用于现场。结果表明：中继站内粉尘产生强度高达3.344×10^5mg/min,且以呼吸性粉尘为主,污染严重;全自动气水雾化除尘系统的运行使得中继站内全尘和呼尘的质量浓度均下降85%左右,降尘效果明显,具有良好的实用推广性。

移动式卸料机除尘系统设计及应用

通过对移动式卸料机特性的分析及不同控制方案的比较 ,确定了卸料机除尘系统设计方案 ,打破了传统吹吸气流控制粉尘的方式 ,采用空气幕 排风联合的捕集方式对移动式卸料机进行除尘系统设计及应用 。

除尘系统阻力平衡技术措施探讨

分析了除尘系统常用的几种阻力平衡措施的特点和孔板节流装置的工作原理 ,通过比较分析从工程设计、调试。

考虑光伏组件发电性能的自动除尘系统运行时间优化

该文针对自动除尘系统运行过程中动态遮挡对光伏组件输出特性影响规律和系统运行后除尘效果进行了研究分析,进而指导光伏组件自动除尘系统运行开启时刻与持续时间的设置,以实现最优化的除尘效果。结果表明:系统在横向(清扫毛刷运行过程平行于水平面)和纵向(清扫毛刷运行过程倾角等于光伏组件安装倾角)各运行周期中,清扫毛刷每经过一排电池组均会使光伏组件输出参数按V形规律变化,自动除尘系统上行时清扫装置对光伏组件的动态遮挡面积相对下行过程增加1.6150%后光伏组件输出功率低谷值下降40%左右;自动除尘系统运行效果随积灰量呈正相关变化;各类光伏组件的除尘过程应避开光伏组件有功率输出的时间段进行,根据地区与季节的不同定在日出之前10 min开始运行,可实现最优的除尘效果。