首钢大型高炉布袋除尘系统煤气温度的控制

介绍了在炼铁高炉煤气布袋除尘系统中,调节荒煤气温度来适应布袋除尘器布袋材质的许用温度的一项新技术。该技术采用热管做传热元件,并用水做降温介质,用管网蒸汽做升温介质,利用水的相变调节煤气温度。     

热管降温技术在高炉干法除尘系统中的应用研究

介绍了在炼铁高炉荒煤气布袋除尘系统中,降低荒煤气温度来满足布袋除尘器许用温度的一项新技术。该技术采用热管做传热元件,并用水做降温介质,利用水的相变吸收荒煤气的热量。     

大型高炉煤气干式布袋除尘技术研究

对高炉煤气干式布袋除尘技术的发展现状进行了总结,阐明了干式布袋除尘技术的工艺流程及低压脉冲喷吹干式布袋除尘技术的原理,重点阐述了研究开发的高炉煤气温度控制、煤气含尘量在线监测、煤气管道系统防腐及除尘灰浓相气力输送等关键技术.     

莱钢750m~3高炉喷煤系统技术改造

莱钢750 m~3高炉喷煤系统改造采用了如下先进技术:中速磨制粉,布袋收粉器收粉,浓相输送技术等。喷煤系统改造后。高炉煤比达到150 kg/t以上,焦比降到400 kg/t以下,取得了较好的效果。     

热管降温器在高炉除尘系统中的应用

介绍高炉荒煤气布袋除尘系统中降低荒煤气温度以满足布袋除尘器许用温度的一项技术。该技术采用热管做传热元件,并用水做降温介质,利用水的相变吸收荒煤气的热量。     

Fractal structures of regular pentagonal stars in Penrose tiling

Fractal structures of regular pentagonal stars are proposed. Some of these structures are detected in Penrose tiling. The fractals are based on generalized stars, whose vertices generate the centers of smaller size stars. There are two possible orientations of generalized stars interrelated by the operation of inversion in a point. The generalized stars to initial star linear sizes ratios are equal to integer degrees of golden mean.     

气力输送在高炉煤气干法布袋除尘系统中的应用

介绍了气力输送的原理和高炉煤气净化系统干法布袋除尘灰的特点。通过以1080矗高炉为例。分析两种气力输送方式的特点及各自的优缺点,得出“浓相气力输送是一种更高效、稳定、有利于高炉灰综合利用的气力输灰方式”的结论。     

焙烧多功能机组除尘系统滤袋的选择

滤袋是焙烧多功能机组除尘系统的主要部件。本文通过膨体微孔薄膜复合滤袋与普通滤袋的对比,说明了选择膨体微孔薄膜复合滤袋的正确性。     

Distribution of niobium and titanium carbonitrides in continuous-cast microalloy steels

The composition, morphology, and distribution of carbonitride phases in slabs microalloyed with niobium (0.04%) and titanium (0.002 and 0.022%) are investigated. In steel slabs with Nb + 0.022% Ti, the carbonitride phase in the axial zone is distributed more uniformly and the particles take the form of six-pointed stars. In steel slabs with Nb + 0.002% Ti, there are stronger liquation processes leading to the formation of extended grain-boundary carbonitrides.     

高炉喷吹煤配加供料系统除尘灰可行性分析

除尘灰的合理利用一直是钢铁厂面临的问题之一,近年来国内重点钢铁企业都在将干熄焦除尘灰配入喷吹煤中进行高炉喷吹,实现了除尘灰的资源化利用。为了明悉不同除尘灰进行高炉喷吹时工艺性能的区别,提升高炉消纳除尘灰的能力,对首钢京唐公司所产干熄焦除尘灰CC9、供料系统除尘灰C8和CCJ1及其与煤粉混合喷吹的可行性进行分析,并根据研究结果在首钢京唐3号高炉进行工业试验。研究结果表明,3种除尘灰均具有高固定碳含量和低的挥发分,燃烧性能比高炉喷吹煤粉差,在配加比例不超过5%情况下,干熄焦除尘灰CC9混煤与供料系统除尘灰C8以及CCJ1混煤燃烧曲线接近,供料系统除尘灰可以配加到煤粉中进行高炉喷吹。从工业试验结果来看,配加5%供料系统除尘灰对高炉喷吹煤粒度、除尘灰成分以及高炉炉况和燃料消耗均不会造成较大影响,可以替代干熄焦除尘灰,弥补除尘灰高炉喷吹资源缺口。     

承钢2500m3高炉布袋除尘系统改进后的工作状态

 经过技术改进和生产实践,承钢各高炉煤气除尘系统完成了湿法向干法除尘的转变。其中2500m3高炉干法除尘系统取消了重力除尘器,采用单一布袋除尘器进行除尘工作,成功实现了炼铁技术的一次重大突破。研究表明,承钢高炉取消重力除尘器后,进入布袋除尘器煤气中大颗粒增多,使得布袋除尘效率提高;布袋进出口压差减小,煤气通过布袋除尘器的压力损失降低;布袋煤气入口温度提高。     

袋除尘器在密闭鼓风炉炼镍系统中的应用探讨

通过对袋除尘器在某冶炼厂4．2m^2密闭鼓风炉镍冶金系统中的应用情况进行总结。对严重影响袋除尘器的寿命的原因进行分析,通过有效的方法使滤袋腐蚀、破损情况得以改善,使滤袋的寿命得以提高。     

影响袋式除尘器全有效生命周期的技术分析

袋式除尘器已广泛应用于工业收尘净化领域,文章提出了袋式除尘器全有效生命周期技术相关性评估模式,在此基础上探讨分析了影响袋式除尘器高效、连续运行的技术参数和技术措施,为袋式除尘能在实际应用过程中保障其高效率、低能耗,且长期稳定运行提供参考。     

延长石灰竖窑除尘器布袋使用寿命的探索

天铁集团石灰石矿300 t/d气烧石灰竖窑除尘工艺采用布袋除尘器,针对布袋更换频率高的现象,分析了制约布袋使用寿命的因素,得出排烟温度、粉尘浓度、烟气中的水蒸汽是影响布袋使用寿命的关键因素.经采取优化除尘系统运行参数及环境等措施,有效地延长了布袋寿命,布袋使用寿命达到27个月,超过行业平均12个月的水平.     

3200m~3高炉喷煤系统技术特点

新区3 200 m3高炉喷煤系统采用中速磨负压制粉,一级高浓度低压脉冲长袋式收粉器收粉。喷吹系统采用双系列双罐并列单管路加分配器浓相输送工艺。喷煤系统按烟煤和无烟煤混喷设计,制粉系统按强爆炸性烟煤设计,最大喷煤比250 kg/t,尾气排放煤粉质量浓度≤30 mg/m3,喷煤系统投运后,运行正常,烟煤配比达40%,高炉喷吹效果良好。     

邯钢2000 m3高炉喷煤系统的设计

邯钢2000m^3高炉叶煤系统设计采用布袋收粉器、浓相输送、炉前分配器等先进技术，设计喷吹能力为200kg/t，目前煤比已到150kg/t。该系统具有固气比高、耗气量少、速度低、控制精度高等特点。     

攀钢钒一期高炉煤气全干式除尘技术应用与实践

介绍了攀钢钒一期高炉煤气全干式除尘工艺原理、主要设备及关键技术,同时对运行过程中存在的问题进行了分析,通过采取检测高炉荒煤气含水量和瓦斯灰Zn含量、优化除尘筒体运行方式和反吹清灰模型等措施,有效减轻了高炉荒煤气管道堵塞和煤气设备腐蚀问题,延长了干式除尘布袋使用周期,确保一期高炉煤气除尘的稳定运行。     

袋式除尘器现状及技术展望

简述袋式除尘器的滤料、清灰方式、过程控制的发展及其现状;对袋式除尘器现有生产工艺提出改进方案;首次提出袋式除尘器的基准模块设计思路,使袋式除尘器设计及制造标准化成为可能。     

Influence of Design and Operation Parameters on Bag-Cleaning Performance of Pulse-Jet Baghouse

In this study, a filter test system with clean new fabric bags was used to measure the pulse pressure and acceleration of the filter bag. Fabric acceleration and pulse pressure were used as an index of bag-cleaning intensity. The jet pump curves, which relate the flow rate through the venturi to the average developed pressure by the venturi, were determined by the similar system. The intersection of the jet pump curve and the bag operating line, which relates the pressure drop to flow rate across the bag during pulse-jet cleaning, is the system operating point that was used to predict the average pulse pressure in the bag during pulse-jet cleaning. Experimental results of this study show that a higher pulse pressure can be achieved without the venturi at the top of the bag for bag materials with low resistance coefficient. For bags with higher resistance coefficients, higher pulse pressure is obtained with a venturi installed at the top of the bag. The predicted pressure values are in good agreement with experimental data. Dimensional analysis for jet pump performance was developed to reduce the experimental data. The results show that the jet pump curves obtained under different operating conditions can be reduced to the same nondimensional curve, which can be used to facilitate the design and operation of a pulse-jet cleaning system.     

Determination of potential migrants present in Nylon 'microwave and roasting bags' and migration into olive oil

Two groups of potential migrants were found in Nylon "microwave and roasting bags' (MRBs): volatile compounds were released at cooking temperatures and non-volatile compounds were extracted with methanol and/or water. A dynamic headspace system at 200 degrees C followed by gas chromatography (GC) coupled to mass spectrometry (MS) was used for determination of volatile compounds. Cyclopentanone (31.7 mg/bag), 2-cyclopentyl cyclopentanone (17.4 mg/bag), hexadecane (2.6 micrograms/bag), heptadecane (3.2 micrograms/bag), octadecane (3.0 micrograms/bag) and epsilon-caprolactam (5.0-35.5 mg/ bag) were the main volatile compounds present in the MRBs. High performance liquid chromatography (HPLC) and mass spectrometry were combined for identification and quantification of non-volatile compounds extracted with methanol (46.0 mg/bag). Nylon 6,6 cyclic monomer and cyclic oligomers up to the tetramer and Nylon 6 monomer and cyclic oligomers up to the octamer were identified and quantified, confirming that the plastic was made of Nylon 6,6 and Nylon 6 polymers. The same non-volatile compounds (except Nylon 6 heptamer and octamer) were found to migrate into olive oil at 175 degrees C for 1 h. A total of 0.916 mg/dm2 (19.2 mg/bag) of non-volatile compounds migrated into olive oil (41.8% of those quantified in the plastic material).