回转窑耐火砖的轨道化运送

在氧化铝生产过程中,回转窑耐火砖内衬的平均运转使用周期约为半年左右。更换耐火砖内衬时,需经两装三卸,筑炉时要付出艰巨     

含钒页岩焙烧用回转窑热应力分布的研究

含钒页岩焙烧用回转窑损坏的主要因素之一是因回转窑内部存在较高的温度和较大的温度梯度而导致窑内部存在较高的热应力引起的。从流体力学与传热的角度出发,利用Fluent软件对回转窑进行流体流动与传热模拟。将温度场模拟结果导入Ansys中作节点插值,然后计算回转窑的热应力。结果表明,回转窑热应力最大的地方就是回转窑耐火砖最先破损的地方。分析结果为评估热应力的危害性提供了保证,并为回转窑筒体的设计和优化提供理论指导。     

延长50m回转窑内衬寿命的技术研发

本文阐述了青铝集团对延长350大型预焙阳极系统50m回转窑使用寿命的技术研发工作,通过不断优化工艺技术条件,实施多项技术攻关改造,实施回转窑设备健康维护理论,创建回转窑健康维护策略与建模,调窑参数优化、健康维护检测技术及回转窑健康维护信息管理等工作,有效提高回转窑系统运行的安全性、可靠性。达到最大限度延长回转窑使用寿命突破1200天的目的,取得了良好的经济效益和社会效益。     

对延长回转窑内衬寿命的探讨

对回转窑内衬浇注料使用寿命的延长做了阐述,重点对传统设计做了改进,并在原设计基础上,结合自身实际,对回转窑内衬材料的选择,筑炉工艺及生产工艺均进行了大胆创新,使回转窑内衬寿命有了大幅度提高,有效提高了设备运转率,降低了生产成本。     

回转窑烟气净化系统的改造

炭素回转窑排烟浓度的控制是否良好将会影响到回转窑正常生产及企业的社会形象 ,本文就回转窑烟气排放超标的原因及解决办法进行了分析 ,对烟气净化系统的改造效果进行了评价 ,对进一步提高沉降室清灰效率及折烟墙使用寿命的途径作了探讨     

浇注料在炭素回转窑内衬施工中的应用及提高内衬使用寿命的途径

内村是回转窑生产过程中物料传热、传质、机械运动等热工过程得以实现的基础结构，炭素回转窑根据煅烧生产工艺确定的温度场分布特点，其内村采用轻质保温料和粘土质浇注料、高铝质浇注料组成复合型内村。本文对影响回转窑内村使用寿命的因素进行了分析，就如何提高回转窑内村使用寿命作了阐述。     

冶金回转窑支承系统有限元分析

对工况下大型回转窑支承系统进行理论分析,根据轮带结构和工作特点,推导出轮带内壁受力分布公式,结合有限元仿真方法,对轮带与托轮组成的支承系统进行接触非线性仿真分析,获得回转窑支承系统的应力应变规律。通过Origin软件对应力应变数据的处理,得到轮带内外壁应力应变随角度变化的曲线图。由仿真实验数据可知,在轮带和托轮接触区域的应力值最大,应力集中明显。轮带存在周期性椭圆变形,引起筒体内部耐火砖剥离与掉落;托轮轮辐孔处是托轮的薄弱处,容易造成轮孔开裂。仿真分析对回转窑支承系统的优化设计与结构改进提供了理论指导,具有一定的实用参考价值。     

回转窑燃烧室持续高温的危害

Φ２．２×４５米回转窑，有用负压调解阀使燃烧室达到设计温度，提高回转窑产能和使用寿命，烟囱不再冒黑烟，保护了环境。     

悬浮铸造在高铬铸铁耐火砖模上的应用研究

以铁粉作悬浮剂,采用悬浮铸造制造高铬铸铁耐火砖模.材料显微结构分析及力学性能测试表明,加入0.5%～1.0%悬浮剂,可使铸件组织细化,碳化物由原来的连续网状变为断续状,显著提高了材料的耐磨性.生产应用表明,采用悬浮铸造高铬铸铁耐火砖模和不采用悬浮铸造的比较,使用寿命提高了88.2%.     

用废耐火砖粉修钢水包包衬

我厂铸钢车间使用的钢水包包衬,过去都是用耐火砖砌成的,耐火砖的用量很大,仅3吨钢水包每大修一次就需要弧砖150多块,而且采用这种方法修的包,使用寿命短,一般可使用4~5次,多者7~8次就要重新修理。这样修包次数十分频繁,每年消耗耐火砖的数量也相当大,同时,修包操作很麻烦,又浪费人力。     

Slag Characterization: A Necessary Tool for Modeling and Simulating Refractory Corrosion on a Pilot Scale

The slag in pyrometallurgical operations plays a major role affecting the life of furnace refractory. As such, comprehensive mineralogical and chemical slag examination, physical property determination including the slag melting point or liquidus, and viscosity are necessary for precise understanding of a slag. At the RHI Technology Center Leoben, Austria, the main objective of slag characterization work is to reach a better understanding of refractory corrosion. This corrosion testwork is performed at the laboratory and pilot scale. Typically, corrosion tests are performed in an induction furnace or rotary kiln, with the main purpose being the improved selection of the most suitable refractory products to improve refractory performance in operating metallurgical furnaces. This article focuses on characterization of samples of six non-ferrous, customer-provided slags. This includes slag from a copper Peirce-Smith converter, a short rotary furnace for lead smelting, a titania-processing furnace, and a Ni-Cu top blowing rotary converter (TBRC) plant.     

工业窑炉中几种炉衬耐火材料结构的传热分析

以1250 ℃轧钢加热炉和1600 ℃隧道窑2种典型的连续热工窑炉为例,通过对不同炉衬耐火材料结构组合的综合传热系数、热流密度和炉墙温度场的传热学计算,结合耐火纤维、耐火浇注料、轻质耐火砖、Al_3O_2空心球砖及镁砖等炉衬材料的几种炉衬结构的传热分析,给出了相应窑衬结构的热导率改变对热流密度和炉墙外壁温度的影响,表明采用轻质绝热耐火材料和耐火纤维的复合窑衬结构其炉墙热流密度大大降低.计算结果显示体现工业窑炉炉衬耐火节能一体化优势的窑衬结构为:1250 ℃轧钢加热炉采用105 mm纤维板+230 mm JM23绝热保温砖+115 mm轻质莫来石耐火砖的窑衬结构;1600 ℃隧道窑采用110 mm纤维板+115 mm JM23绝热保温砖+115 mm轻质莫来石耐火砖+160 mm Al_3O_2空心球砖的窑衬结构.     

Developing basic high-performance products for furnaces in the nonferrous metals industries

Increasingly stringent requirements in the service life of refractory linings for furnaces used in the nonferrous metals industry have necessitated the development of basic high-grade products to meet demands on wear resistance. The use of a new generation of high-density brick types has substantially enhanced key physical properties, such as erosion and corrosion resistance. A practice-oriented testing method has been developed to measure structural flexibility, a parameter that plays an important part in many applications. By optimizing these brick properties, products that withstand even high thermomechanical stress have been successfully manufactured.     

Refractory Wear Mechanisms in the Nonferrous Metal Industry: Testing and Modeling Results

Nonferrous pyrometallurgical processes today operate at a high intensity requiring the best standards for the furnace refractory systems. From one plant to another, there is a range of process conditions such as temperature, slag chemistry, and feed types, and each of these parameters can influence refractory life. It is generally understood that process changes at plants can impact refractory life. The ability to test and understand refractory responses to a wide range of furnace operating conditions is therefore important. The RHI Technology Centre in Leoben, Austria is well equipped with laboratory and pilot plant facilities to evaluate refractory suitability over the range of conditions encountered in modern nonferrous pyrometallurgical systems. This article describes refractory testing at the RHI Technology Centre of the impact of two metallurgical slags on a number of different RHI test bricks. The slags were a fayalite slag and a calcium ferrite slag supplied by two smelter plants. High-temperature corrosion tests were carried out in a 250-mm-diameter induction furnace and a 165-mm-diameter short rotary kiln; each unit was lined with a number of refractory bricks and tested against attack by the particular slag. After testing, the refractory bricks were subjected to several laboratory tests to determine the extent of corrosion. Optimal refractory choices for the customers’ plants were developed based on the test results.     

回转窑筒体中心线调整参数的优化

分析了回转窑筒体中心线偏差产生的原因 ,指出筒体、轮带、托轮之间的几何尺寸、工作温度和托轮受力大小是影响回转窑筒体中心线偏差的主要因素 ,提出了回转窑筒体中心线偏差的计算公式 ,建立了调整回转窑筒体中心线偏差的优化模型 ,并通过计算机仿真进行了验证。     

氧化铝生产采用竖窑和回转窑烧制石灰的比较

竖窑烧制石灰,投资省,占地少,加工费用低,但石灰分解率低,活性不好,而回转窑正好相反。本文对氧化铝生产中采用竖窑和回转窑煅烧石灰进行量化比较,从而证明石灰拜耳法工艺,采用回转窑烧制石灰成本更低。     

浅谈回转窑的节能与环境保护

回转窑是氧化铝生产中的一个重要的大型设备,它的合理使用关系到氧化铝生产的运行成本、节能与环境保护等方面的内容。本文通过几种降低能耗和环保方法的介绍,可以对回转窑的节能、环境保护等方面的内容有实际的指导意义。     

回转窑胴体红外扫描系统的设计

回转窑窑内温度检测的准确与否,是控制回转窑产品质量的重要因素。结合工程设计实践,采用法国KILNSCAN型光机式高速红外测温扫描仪的回转窑胴体温度非接触式工业监测系统实现了对回转窑胴体表面温度、窑体转速的实时监测,实现窑内煅烧带的温度、长度、位置的监测,为燃烧的温度控制提供准确的信息。