共查询到19条相似文献,搜索用时 109 毫秒
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能否取消炭素罐式煅烧炉蓄热室,关键在于当空气预热程度降低时挥发分燃烧能否达到煅烧所需的温度(质的要求);能否取消外加燃料系统,真正作到无燃料煅烧,关键在于挥发分燃烧提供的热量能否满足煅烧需要的热量(量的要求)。从理论计算和实际经验两个方面对罐式煅烧炉的几个问题进行具体的分析和探讨,并从炉子设计的角度提出了改进措施。 相似文献
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罐式煅烧炉是炭素生产中的常用煅烧设备。本文总结了国内一些厂家罐式煅烧炉的烘炉经验,论述了罐式煅烧炉干燥与烘炉曲线的制订,罐式炉的烘炉操作与管理。 相似文献
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一、前言罐式煅烧炉(简称罐式炉)是我国生产碳和石墨制品的主要煅烧设备之一。炉料是在基本隔绝空气的条件下通过炉墙间接加热的。近些年,许多生产厂罐式炉所用的炉料是含高挥发份的延迟焦。炉用燃料已由煤气为主改为烧炉料自身的挥发份为主。甚至全部烧挥发份。本文的重点就是研究罐式炉全部烧挥发份的条件下,炉子热平衡,热效率的概念及计算方法;并以热平衡法导出罐式炉的热工特性方 相似文献
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以CFD(computational fluid dynamics)为计算平台,利用所开发的物理和数学模型,对罐式煅烧炉大型化进行仿真与优化计算,同时对各火道挥发分分配比例进行了计算,并得出结论:无论是从火道内负压分布、温度分布、生产操作方面,还是从投资建设方面,同样增加炉体总高度的情况下,8层火道(间距适当增加)的火道布局方式比10层火道更适用于大型化罐式煅烧炉。挥发分分配比例,不仅影响罐式炉产量,更影响煅后焦质量。要适当降低二层挥发分比例,不应超过30%,首层和二层挥发分比例之和不应超过70%。 相似文献
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<正>1罐式煅烧炉排烟方式罐式煅烧炉烟气通过烟道、烟囱排入大气。其排烟方式分自然排烟与机械排烟2类。烟囱按砌筑用材质分砖、钢筋混凝土、钢烟囱3种。烟囱出口直径小于或等于0.7 m时,采用用钢板焊制的钢烟囱,烟气温度低于500℃时,烟囱内壁不衬耐火材料;高于500℃时,需衬耐火材料。圆形砖烟囱的最小出口内径限为0.7 m,常用出口内径范围为0.8~1.8 m;钢筋混凝土烟囱常用出口内径范 相似文献
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我公司1 250t/d新型干法水泥熟料生产线于2003年11月建成投产,调试工作于2004年3月结束,此后生产一直正常运行,但2004年9 ̄10月,接连出现了3次“红炉”事故。本文以管道式分解炉为例,就炉衬烧损而造成的分解炉“红炉”事故的成因及预防措施进行分析探讨。1炉衬烧损机理分析1)Φ 相似文献
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0 前言 我厂烧成系统的分解炉和预热器采用了带TSD型分解炉的单系列低压损五级预热器系统,目的是利用低挥发分无烟煤作为燃料,燃烧器采用丹麦-青岛史密斯公司新型多通道大推力煤粉燃烧器.在试生产期间曾出现二次分解炉红顶和红壁事故,本文就此作一分析和处理. 相似文献
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Yijie Gao Benjamin J. Glasser Marianthi G. Ierapetritou Alberto Cuitino Fernando J. Muzzio Jean W. Beeckman Natalie A. Fassbender William G. Borghard 《American Institute of Chemical Engineers》2013,59(11):4068-4076
Rotary calcination is widely used in catalyst manufacturing and many other industrial processes. In this article, the influence of operational variables and material properties on the mean residence time (MRT), hold up, and axial dispersion was investigated in a pilot plant rotary calciner. Residence time distributions (RTD) of spherical, cylindrical, and quadrilobe catalyst particles were measured and contrasted. The Saeman's model was successfully applied to predict the experimental bed depth and the MRT as particles flowed through the calciner. It was observed that increasing the feed rate did not significantly affect the MRT. Results for the different particles indicated that cylinders and quadrulobes exhibited less axial dispersion than spheres due to the decreased flowability. A reliable method was developed to provide a reasonable RTD prediction in rotary calcination systems. © 2013 American Institute of Chemical Engineers AIChE J, 59: 4068–4076, 2013 相似文献
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Chengzhi Tang 《Chemical engineering science》2007,62(5):1408-1417
An experimental investigation is reported on the effect of fiber length distribution on gas holdup in a cocurrent air-water-fiber bubble column. Different combinations of 1 and 3 mm Rayon fibers are used to simulate different fiber length distributions. At a constant total fiber mass fraction, gas holdup generally decreases with increasing mass fraction of the 3 mm Rayon fiber while other conditions remain constant. Crowding factors estimated using four different methods (Nc=Nc,A, , Nc,L, and Nc,M) and the parameters and are tested on their performance to quantify the overall effects of fiber mass fraction and fiber length and its distribution on gas holdup. and provide the best characterization of the fiber effects on gas holdup in the cocurrent air-water-fiber bubble column. The crowding factor estimated using the model-based average fiber length (Nc,M) also provides a good characterization and is better than the other crowding factor definitions. 相似文献