四种蓄热室格子体用筒形砖的性能比较

本文分析了比较了四种蓄热室格子体用筒形砖的各项技术经济性能指标,指出采用图中的Ｂ型筒形砖,用乙种码砌方法,综合效果最优。     

Z形电熔格子砖实用性浅析

根据Z形电熔格子砖的化学成分、物理性能以及使用试验,说明Z形电熔格子砖具有与十字形砖和筒形格子砖相同的使用功能,更好的使用性能,分析了Z形电熔格子砖在延长蓄热室使用寿命和节能增效方面的价值。     

玻璃熔窑蓄热室筒形、条形、十字形格子砖的应用对比

以新建1000t/d浮法玻璃熔窑为例,分别计算了典型的筒形砖、条形砖、十字形砖格子体的相关数据。这些数据包括:蓄热室腔道平面尺寸、单侧蓄热室的格子孔数量、助燃空气和烟气在格子孔内的流速、格子体上下部的传热系数、全窑格子体的总传热系数、需要的格子体换热面积、格子体高度、全窑格子砖的重量。最后对三种类型格子砖的优缺点及使用性能进行了分析对比。     

热风炉格子砖内气体的传热参数

建立了热风炉蓄热室格子砖二维温度场数学模型,研究了不同类型格子砖内气体的传热参数. 结果表明,使用高效小孔格子砖可同时提高加热面积和对流换热系数,37孔格子砖的换热速度是19孔格子砖的1.8倍,19孔格子砖的换热速度是7孔格子砖的1.6倍. 但随格孔直径减小,压力损失明显提高. 当格孔直径为30 mm、活面积为0.36时,风温可达1206℃,且压力损失处于激变区和缓变区之间. 因此,在新建和改造的热风炉上可采用19孔格子砖获得良好的热工指标.     

玻璃熔窑蓄热室格子体设计

介绍了最常用的几种格子砖使用情况,指出国内一些熔窑格子体存在的问题,提出了以熔窑所需的单位助燃空气量(Nm3/s)来计算格子体体积的方法.并对采用不同类型的格子砖进行了实例计算.文章还针对格子体的工况条件,提出了比较适合我国国情的格子体材料选配方案.     

V_2O_5对玻璃熔窑蓄热室镁铬质格子砖的侵蚀

通过对玻璃熔窑蓄热室格子体使用后损毁状况的观察,对格子砖的原砖和残砖的分析,并结合部分模拟试验进行研究的结果,指明了当熔制玻璃采用重油作燃料时,燃油灰分中的V_2O_5对镁铬质格子砖有助熔作用,可促进镁铬质格子砖中的方镁石和尖晶石晶粒长大并导致格子砖裂隙的形成和扩展,也促进硅酸盐相镁橄榄石化,对格子砖表层的高熔点晶相的漂浮也有影响。同时指明V_2O_5对镁铬质格子砖的侵蚀主要是通过砖内的硅酸盐相进行的。欲提高镁铬质格子砖的耐侵蚀性,在降低其气孔率的同时,必须尽可能地降低硅酸盐含量。     

浮法玻璃熔窑蓄热室条形砖与筒形砖格子体的比较

以公司浮法线为例,阐述了条形砖格子体与筒形砖格子体在生产中参数的对比,以及浮法玻璃熔窑蓄热室格子体维护的重要性。     

玻璃池窑蓄热室,格子砖的选材与改进

近年来由于电熔锆刚玉砖的质量提高,品种增加和使用部位扩大,使池窑的寿命延长到5～8年,窑炉的薄弱环节由池窑主体熔池转向蓄热室和格子体,格子体的材质成为延长池窑作业周期的关键.如采用价格昂贵的十字型格子砖可使池窑造价提高1～1.5倍.作者综述了近年来蓄热室和格子体结构的革新,格子砖的侵蚀和机理.归纳了池窑、蓄热室和各部格子砖材质的选用.     

采用电熔AZS筒型砖作蓄热室格子体的节能效果分析

通过一系列计算,对照玻璃窑蓄热室格子材料采用电熔AZS筒型砖和传统的高纯镁砖及镁铬砖作对比分析,计算出最佳的蓄热室格子体材料及其节能效果。     

格子砖材质和排列方式对蓄热室换热特性的影响

作者根据热平衡原理针对广泛使用的立式单通道蓄热室建立了蓄热室内温度场的数学模型。计算机计算结果表明,格子砖材质的更换会改变蓄热室的换热特性。采用不同材质的格子砖时,必须根据使用条件和对换热效率的影响确定适当的高度比值。格子砖排列方式对蓄热室换热特性也有较大影响。单位体积具有较多受热面积和较大砖容量的格子体能获得较高的换热效率。     

Damage Mechanism and Structure Analysis of Used Clay Checker Bricks for Regenerators of Coke Ovens

During long-term use, the clay checker bricks for regenerators of coke ovens on gas side react with the impurities containing Fe and K_2O, causing foaming, softening and deformation, which is not only related with the impurity content and properties of the clay checker bricks, but also related with the type and the composition of the dust in the gas. After long term use, the clay checker bricks of coke ovens on air side have relative lower impurities containing Fe and K_2O. The inferior clay checker bricks, with high impurity content and high porosity, are easy to pulverize and deteriorate due to the oxidationreduction reaction with the iron oxide and the gas. The gas quality shall be concerned for long service life of the coke oven regenerators.     

Production and service testing of small-size fired and non-fired forsterite brick

Conclusions The use of small-size fired forsterite bricks for regenerator checkers in open-hearth furnaces is tantamount to using large-size fired bricks and provides the same wear resistance, making it possible to increase the output of forsterite checker bricks and reduce the cost of production for sterite checker bricks and reduce the cost of production simultaneously.The good results of the preliminary tests show the effectiveness of using forsterite bricks in the top part of the checker.The use of non-fired bricks to the extent of 50 to 60% of the total number required creates further possibilities for stepping up forsterite checker refractory output, reducing the cost by about 25% and also stepping up the output of magnesite-chrome roof brick.     

A Short Communication on Refractories as Kiln Lining along Various Thermal Zones in Pre-calcining Cement Rotary Kiln

Modern cement rotary kiln is often large in size while rotating in high speed. Thermal condition within a rotary kiln is rather complex,exerting severe thermal and chemical attack on refractory of its kiln lining. In the present paper,the cause that leads to refractory failure was analyzed; requirements for refractory to overcome such failure was discussed. Composites and properties of different refractories most often used as kiln lining were assessed,including magnesia-chrome bricks,magnesia spinel bricks, dolomite bricks, silicon carbide mullite bricks and castables etc. Recommendation was made for refractories with suitable composites and properties to be used as kiln lining in each specific zone to best counteract the severe thermal conditions. A cost-effective configuration was presented to assemble kiln lining for rotary kiln's different zones in line with the regulation at JC/T 2196-2013 "Specifications of refractory for cement rotary kiln". Chromite-free refractories with property of high endurance to thermal attack and corrosion are required to be used in modern Pre-calcining cement rotary kilns.     

水泥回转窑烧成带用耐火材料的最新研究

对水泥回转窑烧成带用耐火材料的使用条件和要求进行了分析,并对近年来水泥窑用镁铬砖、镁尖晶石砖、镁钙锆砖的应用进行了探讨,指出所存在的缺点及改进措施。认为其发展方向为镁钙锆砖及尖晶石砖,并对其应用前景进行了展望,希望实现水泥回转窑的无铬化。     

7.63m焦炉主要耐火材料简评

介绍了7.63m焦炉主要耐火材料的品种、数量、材质及各种砖型的验收技术条件,同时还对半硅砖、硅线石砖、硅火泥、格子砖等的应用问题进行了深入的讨论.7.63m焦炉炉体密封性好,但异型砖多,有些砖的成品率极低,复杂的炉体结构对焦炉生产操作和寿命是否有影响还需进一步的实践验证.     

活性石灰套筒窑煅烧带的材质选择

本文主要通过对几种耐火材料的热震稳定性、抗石灰侵蚀性和耐磨性能的实验和分析,以及对本钢活性石灰套筒窑煅烧带坍塌原因的分析,最终得出应该选择镁铝尖晶石材质的制品代替原来所用的纯镁质制品作为活性石灰套筒窑煅烧带的砌筑材料的结论。     

窑具抗热震性评价方法的研究

针对现有抗热震方法在评价窑具材料时存在的局限性,在YB/T376.3-2004水急冷-裂纹判定法的基础上,提出了空气急冷-裂纹判定法。结果表明该方法适合于窑具材料抗热震性的评价。相同材质、相同形状的刚玉-莫来石质窑具的热震次数与使用次数存在相关性。而对相同材质、不同形状或不同材质、相同形状的窑具之间,不适合进行抗热震性的对比。该方法测定的热震次数与水急冷法的结果差别较大,水急冷法的热震次数明显高于空气急冷-裂纹判定法。     

1000t/d预分解窑经济实用性配砖的实现

水泥窑窑衬的设计配套和操作维护是一个系统件的工程。质优价高的衬砖必须通过合理的匹配、提高操作水平和砌筑质量，稳定窑内热工制度来发挥它的优越性能、反过来中低档衬砖如在操作维护—上下足功夫、结合窑的实际工况特点，亦能获得较好的效果。     

水泥窑用耐火材料及其选择匹配

水泥窑用耐火材料有粘土砖、高铝砖、磷酸盐结合高铝质窑衬砖、镁砖、镁铝尖晶石砖、普通镁铬砖、直接结合镁铬砖等等，根据它们不同性能分别匹配于窑系统的不同部位。     

Present Synthesizing Situation and Application Mechanism of Hercynite in Cement Kilns

The magnesia-hercynite bricks offer a new lining to rotary cement kiln. They are well adopted and widely used in the high temperature zone of cement kiln, and have obtained good performance at rigorous and severe working conditions. The synthesis of hercynite requires a suitable atmosphere with proper O2 partial pressures which makes sure FeO can stably exist at the synthesizing temperature. Current industrial production of hercynite mainly adopts fused method. The other method, sintering method, is not mat...