预热器最下一级旋风筒安装内筒的利与弊

目前的新型干法水泥生产线窑尾系统多数为旋风预热器加分解炉结构。由于最下一级旋风筒内温度较高,热负荷较大,内筒容易损坏或脱落,而更换新的内筒需要长时间停窑。为减少对生产的影响,很多厂在内筒烧损时,常常会采取临时措施处理后继续开机坚持生产。本文以几个公司的实际生产情况为此,对比了最下一级旋风筒有内筒时和没有内筒时的生产情况。     

悬浮预热器撒料板的实用制作技术

在新型干法生产线窑尾烟室上升烟道及各级旋风筒出风管部位都安装有撒料板,使预热器各级下料管内下落的物料分散均匀,并在负压的旋转气流中达到充分悬浮,有利于物料与高温烟气的热交换,从而逐步完成物料的预热和预分解反应。因预     

XP型低阻高效旋风预热器的开发研究

开发了一种具有偏心内筒、斜顶结构的XP型预热旋风筒，并对其进行了系统全面的冷态模型试验研究。结果表明，这种旋风筒结构简单、流场分布合理、压力损失低且分离效率较高，是一种性能优良的低阻高效型预热旋风筒。     

旋向对预热器旋风筒压损的影响

为了探索研究旋风筒旋向布置对预热器压损的影响,试验采用了两种模型装置,对比了三种进口气流旋转强度不同的旋风筒在不同风速和固气比下压损变化的差异。研究表明,带旋转强度的气流进入会加大旋风筒压损,且旋转强度越大,压损越高;二级旋风预热器的旋风筒同向布置较反向布置更有利于预热器压损的降低;在空载和低固气比工况中,旋向布置对预热器压损有较大的影响,高固气比工况中,旋向对预热器压损的影响会减弱。     

挂板式内筒在三级旋风筒的应用

我公司2~#窑为2000t/d预分解窑生产线,窑尾系统分解炉型式为RSP炉,四级悬浮预热器。三级旋风筒内筒原为整体式结构,如图1所示。正常生产时温度为760℃左右,自1995年12月末使用后,仅使用了7个月,内简便烧坏变形,难以适应生产要求。     

挂板式内筒在三级旋风筒的应用

我公司2#窑为2000t/d预分解窑生产线,窑尾系统分解炉型式为RSP炉,四级悬浮预热器。三级旋风筒内筒原为整体结构,如图1所示。正常生产时温度为760℃左右,自1995年12月末使用后,仅使用7个月,内简便烧坏变形,难以适应生产要求。     

600t／d五级旋风预热器窑优化操作

本文针对600t/d五级旋风预热器窑系统操作的风、煤、料、窑速平衡的基本规律、基本要求以及保证措施从理论与实践两方面进行了较深入的讨论.并通过典型操作实例的剖析和系统达标工作多数的介绍,为生产操作提供了可供参考的经验.     

旋风分离器内旋进涡核的实验研究

采用热线风速仪测速,ＦＦＴ 变换处理数据的方法,研究直切式旋风分离器内旋进涡核（ＰＶＣ） 现象。研究表明,涡核旋进运动主要存在于排尘口附近区域内,其频率接近为一常数,且与入口气速成正比,在排尘口附近,涡核形成高强度的偏心摆动。     

PSC型旋风管组合结构参数对分离性能的影响

通过导叶式旋风管不同组合结构分离性能的对比实验,研究了排尘结构、排气芯管结构以及分离空间高度等结构参数对旋风管分离性能的影响规律。通过大量实验数据分析,绘制出旋风管不同组合结构的分离性能曲线,总结出不同结构参数变化对旋风管分离性能相应的影响规律。     

Comparison of boundary conditions for predicting the collection efficiency of cyclones

Gas-particle flow in three cyclones was numerically modeled using the Eulerian-Lagrangian approach. A tangential lift-off boundary condition was developed and included in the CFD simulations of cyclone performance via a user-defined function. Particles were considered as detached from the surface if they met the criterion of tangential lift-off; otherwise they were captured by the surface. Prediction of the collection efficiency in cyclones was conducted using the three different boundary conditions: (1) bottom trap only; (2) cone and bottom trap; and (3) the tangential lift-off, which is a combination of trap and reflect. Comparison with experimental data in literature indicates that the tangential lift-off boundary condition yields more accurate predictions than other boundary conditions.     

预热器输送提升管内阻力损失的试验研究

以旋风预热器的输送提升管为研究对象,按气固运动状态和输送管道的结构特征,将输送提升管道分为气固加速运动段、匀速运动段和弯管段。对各区域的阻力损失的构成及影响进行了试验研究。结果表明,各区域的阻力损失在不同操作参数下所占比例也不相同,空载时弯管段的阻力损失最大,荷料时加速段的阻力损失最大,所占比例超过60％,对提升管阻力损失起着决定性的作用。同时以研究结果为依据,研究了入料点的变化对提升管阻力损失的影响。     

预分解窑预热器系统的堵塞及处理

全面分析了预热器发生堵塞的种类及原因,提出了控制原燃材料的质量、稳定生料化学成分、使用压缩空气喷吹与空气炮轰打、控制预热系统的温度、使用核子料位计、正确控制止料留火操作等是防止预热器发生堵塞的技术措施,而使用高压水枪、Cardox爆破等是处理预热器不同类型堵塞的技术措施。     

Use of ferrous powder for increasing the efficiency of solid particle filtration in natural gas cyclones

This paper investigates the experimental feasibility of using magnetic forces to enhance the efficiency of the overall solid–gas separation in cyclone separators used in gas treatment. More specifically, the use of adhesive ferrous powder to further increase the lateral forces on the solid particles is investigated. The size distribution of the escaping solid particles with clean gas is compared between the conventional cyclone design and the proposed technique. It is shown that these additional forces are added to the centrifugal force, enhancing the separation efficiency in conventional cyclones, particularly for smaller particles.     

On some mathematical models of the suspension flow in porous medium

The phenomenon of suspension flow in porous medium is accompanied by the time—space of the concentration N of solid particles suspended in dispersing fluid, as well as, by the change of the concentration P of particles trapped in porous medium. These changes are due to the trapping of suspended particles by porous media i.e. to the, so-called, colmatage phenomenon, as well as, due to the breaking away of particles of this medium i.e. to the, so-called, scouring phenomenon.The system of the equations, which describe the transport of the volume of suspended particles and the kinetics of the colmatage—scouring process, determines the function N and P. In the equation describing the transport phenomenon there is taken into account the phenomenon of diffusion of particles suspended in dispersing fluid.Three mathematical models of the phenomenon concerned will be presented. The first model leads to a hyperbolic systen of equations, the second one to a parabolic equation and the third also to a hyperbolic equation.There has been obtained particular solutions important from the point of view of experimental investigations. In particular the case of colmatage phenomenon due to the impulse inject of suspension is interesting.     

5 000 t/d熟料生产线悬浮预热器堵塞的预防与处理

新型干法线窑尾预热分解系统经常发生堵塞问题，且处理难又影响企业效益，尤其是大中型生产线。作者简要介绍了堵塞发生时的窑尾工况及参数变化特征；详细分析了引起堵塞的众多工艺因素和机械原因；同时就常规的清堵措施及预防措施进行总结介绍。     

几种中小型预热器系统分离效率的比较

通过对国内几种中小型悬浮预热器系统分离效率的比较,及窑灰的易烧性试验结果分析,提出了立筒预热器系统应特别强调一级筒的高分离效率;五级旋风预热器系统应强调各级分离效率的匹配。