减小入窑煤粉量波动的技术改造

我公司煤粉计量及输送系统在改造前存在以下问题:(1)煤粉由煤粉仓入转子秤经常有下料不畅甚至断煤的情况出现;(2)粉磨的煤粉在进行煤粉仓切换进料时,煤粉计量秤的波动幅度变得较大;(3)在煤粉转子秤运行较为稳定的情况下,头煤和尾煤的送煤压力也会出现较大幅度的波动。对煤粉计量秤的给料、排气以及煤粉输送管道进行改造,有效地降低了入窑煤粉量的波动,改善了该生产线的产量和质量。     

煤粉产出运移及防治规律研究进展

综述了煤质特征、现场施工及排采过程对煤粉产出的影响以及煤粉在裂缝、井筒内的运移规律,并按照煤粉的生成、进入地层、在地层中运移、进入井筒、在井筒中运移的步骤思路,总结了各个步骤中现在广泛应用或处于构想阶段的煤粉运移防治措施。提出了建立大型可视化多裂缝装置,从宏观整体以及微观局部观察煤粉在其中的运移规律,并增加稳定的加环压装置,量化每次实验的夹持压力等研究方向。以期能对煤粉运移规律进行更为深入的研究,解决煤层气开采过程中的重大问题。     

煤粉预热对高炉喷吹中煤粉燃烧行为的影响

通过建立数学模型,在Fluent软件的基础上结合自编程序,对不同预热温度下高炉喷吹煤粉的燃烧进行了模拟,得到了预热温度对煤粉燃烧的影响规律. 模型中包含了煤粉与O2, CO2及水蒸汽的异相反应,且考虑了焦炭的燃烧反应. 确定了回旋区的大小与形状,将煤粉燃烧空间划分为4个区域,对不同区域分别提出不同假设进行处理. 计算结果表明,煤粉预热后进行喷吹可促进煤粉在风口前提前气化,使煤粉的燃烧区域前移,提高了煤粉在回旋区的燃尽率;预热温度每提高50℃,煤粉在回旋区的燃尽率平均提高2%.     

工业煤粉锅炉煤粉制备中磨煤机的选型及发展

磨煤机是工业煤粉锅炉煤粉制备系统中的核心设备。我国煤炭种类的多样性决定了磨煤机类型的多样化,磨煤机的正确选型在煤粉制备系统中至关重要。详细介绍了低速、中速和高速三大类别中各类型磨煤机各自的发展历程、工作原理、结构特点以及优缺点,分析了各类型磨煤机对煤种的适用性,说明中速磨煤机最适宜应用于目前工业煤粉锅炉煤粉制备系统,指出随着工业煤粉锅炉的快速发展,磨煤机不仅要适应性强,粉磨效果好、产量高、质量硬,还要在降耗及环境方面有所突破。     

神府煤粉燃烧特性

为了给煤粉锅炉用户提供煤粉优选理论依据,以煤粉锅炉主要用煤神府煤制备的煤粉为研究对象,采用TG-DTG对煤粉的燃烧特性进行研究,分析了不同煤粉及升温速率对煤粉燃烧特性的影响。结果表明:在空气气氛下,升温速率提高,TG、DTG曲线向高温方向移动,煤粉的着火温度升高,最大质量变化速率增大,最大失重温度提高,燃尽指数增大;随着灰分和粒径改变,升温速率为10或20℃/min时,煤粉的着火温度变化不显著,燃尽指数及综合燃烧特性指数均有影响。灰分减小,粒径不变时,D煤粉的综合燃烧指数为1.51,优于粒径74μm、灰分9.5%的P煤粉。     

煤粉粒径对骨料烘干煤粉燃烧器排放特性的影响

构建骨料烘干煤粉燃烧器内煤粉燃烧行为的控制模型,以污染物含量为评价标准,研究了骨料烘干煤粉燃烧过程中煤粉粒径对排放特性的影响规律. 结果表明,随煤粉粒径增大,煤粉在燃烧器内燃烧不充分,CO排放量增加,CO2排放量逐渐减少,SO2排放量增加,NO排放量在煤粉粒径为100 um时最小.     

煤粉罐车卸料速度影响因素研究

为解决工程实践中煤粉罐车向煤粉塔气力送粉时间过长的问题,对输送阻力进行了计算,并对煤粉罐车的卸料速度影响因素进行了分析。结果表明:上粉管的压力损失由两相流摩擦压损、煤粉颗粒重力压损以及煤粉颗粒加速动力压损3部分构成。当煤粉塔高度由23 m变为28 m时,同样输送20 t煤粉所需时间由50.0 min延长到58.5 min,延长了17%,若保证输送时间不变,则输送管内径应由100 mm增至106 mm,此数据与实际仍有较大偏差,这是由于管道内存在其他阻力因素或煤粉水分较高导致。因此,为保证良好的输送效果,建议采用锅炉房或厂区内的洁净干燥压缩空气作为上粉输送气体。     

燃煤石灰回转窑尾气在煤粉制备系统中的应用

通过对燃煤石灰回转窑尾气的分析,得出结论:回转窑尾气可以用作煤粉制备系统的烘干煤粉介质,这不仅充分利用了回转窑尾气余热、节能降耗,而且还因为回转窑尾气氧含量低,大大提高煤粉制备系统的安全性。     

玻璃窑炉煤粉纯氧燃烧技术可行性分析

煤粉纯氧燃烧技术是熔窑燃料的一种新技术,文章对玻璃窑煤粉纯氧燃烧有利因素和不利因素进行了分析,认为在玻璃窑炉煤粉纯氧燃烧技术是可行的     

也谈烧成系统中煤粉水分、细度及其可用热值

从水泥熟料烧成系统稳定运行方面考虑,有效控制煤粉的燃烧特性、发热量、灰分、细度和水分等参数非常重要。详细分析了煤粉水分,煤粉细度和煤粉热值及其影响因素,在此基础上,介绍熟料烧成系统中使用煤粉时对其水分、细度和可用热值的分析和控制指标。     

高炉风口直吹管预燃煤粉模拟实验和计算

本文对作者提出的风口直吹管预燃煤粉的数学模型进行了实验验证．应用该数模对高炉喷煤直吹管预燃煤粉进行了数值计算和预测．根据计算结果，直吹管可预燃一部分煤粉，提高煤粉在风口区的总燃烧率．     

Induction-heating ignition of pulverized coal stream

Induction-heating ignition burner for the pulverized coal fired boiler is introduced. Some experiments were conducted on an experimental set-up, which includes alternative current power system, induction-heating system, pulverized coal and air supplier system, and measurement system to study the ignition process of coal powder and air mixture stream. Some results are presented. An industrial induction-heating burner for a 220 t/h boiler, which was designed on the basis of a series of researches, is described. This kind of oil-free ignition burner is characterized by its stable operation performances, and the lower cost in its maintenance.     

煤粉加压气化技术在洁净煤领域的应用

煤粉加压气化技术是一种洁净煤气化新工艺,该工艺对原料的适用性强,碳的转化率高,氧耗、煤耗低,操作弹性大,环保性能好。文中从技术开发、工艺流程及煤化工应用等方面对2种煤粉加压气化技术进行了详细的介绍,并就其应用前景做了阐述。     

恩德粉煤气化炉的设计与应用

介绍了恩德粉煤气化炉的工艺原理、技术特点及应用实例，分析了工程中出现的问题和投资效益。     

恩德粉煤气化工艺的设计与应用

介绍了恩德粉煤气化技术的原料、气化剂、操作温度压力等工艺条件,简述了生产工业燃气和合成气工业装置的工艺流程及其改进措施。     

喷吹罐爆炸事故技术分析

某喷吹罐在运行过程中发生爆炸,导致火灾和人员伤亡。通过对事故现场勘查、DCS操作记录查看和相关人员笔录的综合分析,得出了产生爆炸事故的原因。操作人员在富氧房内的误操作导致氧气进入到氮气管道,使喷吹系统氧含量迅速增加,喷吹罐内的氧含量超过规范值,从而导致了煤粉燃烧爆炸。     

钢铁企业燃料供给方案的一种最佳选择

恩德粉煤气化技术对煤种适应性宽、三废处理简单、技术成熟可靠,选用劣质褐煤生产的工业煤气成本低、综合效益好。所生产的煤气热值适宜,对用气量的波动调节灵活,适用于较大规模钢铁企业的煤气生产。文中还对恩德粉煤气化技术在应用过程中应注意的问题进行了详述。     

粉煤气化技术浅析

介绍了粉煤气化技术的工艺原理、气化炉类型及气化方法。对目前各种气化技术的主要优缺点和应用现状做了详述。提出了粉煤气化技术的发展趋势,并为该技术的选择及应用提供了参考意见。     

Three-dimensional modelling of in-furnace coal/coke combustion in a blast furnace

A three-dimensional mathematical model of the combustion of pulverized coal and coke is developed. The model is applied to the region of lance-blowpipe-tuyere-raceway-coke bed to simulate in-furnace phenomena of pulverized coal injection in an ironmaking blast furnace. The model integrates not only pulverized coal combustion model in the blowpipe-tuyere-raceway-coke bed but also coke combustion model in the coke bed. The model is validated against the measurements under different conditions. The comprehensive in-furnace phenomena are investigated in the raceway and coke bed, in terms of flow, temperature, gas composition, and coal burning characteristics. The underlying mechanisms for the in-furnace phenomena are also analysed. The simulation results indicate that it is important to include recirculation region in the raceway and the coke bed reactions for better understanding in-furnace phenomena. The model provides a cost-effective tool for understanding and optimizing the in-furnace flow-thermo-chemical characteristics of the PCI operation in full-scale blast furnaces.     

Performance of an entrained-flow gasification technology of pulverized coal in pilot-scale plant

Performance of an entrained-flow gasification technology of pulverized coal in pilot-scale plant is introduced. The gasifier was operated for a throughput of 30–45 t coal per day at pressures of 1–3 MPa. Dense-phase pneumatic conveying was employed for coal's feeding to the gasifier using nitrogen and carbon dioxide as carrier gas, respectively. Effects of the operating conditions including oxygen/carbon ratio and steam/carbon ratio on gasification results were investigated, and the concentration of (CO + H₂) in gaseous products reached up to about 97% (vol., dry basis) when CO₂ was employed as carrier gas. Moreover, performances of some important instruments in the conveying system of pulverized coal, such as the level indicator and the solid mass flow meter, were also investigated. The typical operating results in this plant such as (CO + H₂) concentration, oxygen consumption, coal consumption, carbon conversion and cold gas efficiency were almost as good as those of some well-known dry-fed entrained-flow coal gasification plants.