回转干燥机直线度的优化

本文介绍了一种优化大型回转干燥机筒体直线度的方法。本方法实用、简单,可以有效的改善回转干燥机筒体直线度的变形程度,是改善筒体受力状况、防止托轮轴瓦轴承过热、预防筒体开裂和合理调整滚圈参数的前提和保证。     

大型回转干燥机设备筒体的制造技术

指出了大型回转干燥机设备筒体制造的关键技术点,并对大型回转干燥机设备筒体制造的关键技术点进行了说明,保证了大型回转干燥机筒体的制造精度,对其制造行业具有指导意义。     

蒸汽管回转干燥机制造过程中的质量控制

蒸汽管回转干燥机是一个对制造精度要求很高的大型动设备。介绍了蒸汽管回转干燥机的结构、工作原理以及特点和用途,分析了在制造过程中的主要检验控制点,如筒体的同轴度及关键部位的跳动量等,以保证蒸汽管回转干燥机的制造质量。     

浅谈大型回转设备的制造

以大型回转干燥机制造为例,主要阐述了如何选择合理的施工方式,从而确保筒体的制造精度,管支架管孔中心与筒体端板管孔中心的同轴度,出料螺旋各连接止口、平面相对于筒体回转中心的形位公差等。这些重要的技术参数是保证设备良好运转的关键要素。     

回转窑轴线测量技术研究及改进

分析介绍了目前回转窑轴线测量的几种主要方法（其中包括筒体位置测定系统、零位移方向键相测量法等）的原理及其这些测量系统的优缺点。针对这些间接测量方法中轮带直径的测量问题，提出了一种新的能同时测量回转窑筒体的轮带直径和回转中心位置的三点测量法。此方法不仅可以得到筒体的轴线情况，还能得到轮带的变形情况，这是目前各种动态测量方法中所不能做到的。     

复混肥用回转干燥机存在问题的改进措施

针对某公司磷复肥装置的回转干燥机在运行过程中出现的成品含水率偏高,出料粒度不合格,甚至出现物料黏结在筒壁和抄板上等问题,介绍了解决这些问题所采取的相应措施,如提高物料在干燥机内的停留时间,改进筒内抄板的结构,筒体密封改用径向密封等,效果良好。     

PTA装置氧化回转蒸汽列管干燥机腐蚀失效分析

PTA装置氧化回转蒸汽管干燥机因腐蚀等原因造成加热管和筒体多次泄漏 ,通过对加热管进行取样分析 ,查找腐蚀失效机理 ,为检修提供了依据     

回转干燥机滚圈与筒体连接形式的改造

通过计算,分析瓮福化工公司60万t/a磷酸二铵生产线回转干燥机滚圈与筒体松套连接的弊端,确定滚圈与筒体采用固定式胀紧连接的改造方案。通过改造,保证了滚圈与筒体连接的同心度,有效避免了筒体碾压滚圈运行的情况,托轮振动明显减小,滚圈使用寿命延长。     

钢拖排井字门式杆的吊装方法

我公司在内蒙古神华煤直接液化项目催化剂制备装置回转干燥机（102-DR-401A/B/C）吊装中,对直径3.8m,长度为15.4m,重量为100多吨的回转干燥机筒体采用钢拖排井字门式杆的吊装方法,解决了在钢筋混凝框架里大型设备安装不能靠建筑物作吊装梁的难题,取得了良好的效果和经验。     

HDPE蒸汽管回转干燥机滚圈结构改进

对键连接的HDPE(高密度聚乙烯)蒸汽管回转干燥机的滚圈在工程应用中出现的失效原因进行了分析,提出了滚圈结构和滚圈与筒体之间连接结构的改进设计方案.改进后的滚圈为整体断面结构,并与筒体采用松套式连接.     

直热式转筒干燥过程物料停留时间理论推导

为了对物料在直热式转筒干燥机内理想扬料板作用下停留时间进行计算研究,根据扬料板作用下的物料在转筒内撒落分布均匀状态,建立了理想扬料板的截面方程,采用建立的理想扬料板的截面方程,导出了随着转筒转动到不同位置的扬料板持料量,在此基础上,分析物料在直热式转筒干燥机内的实际运动情况,建立转筒内物料运动的数学模型,导出物料在转筒内的停留时间,对现有停留时间计算方法进行了修正。研究为扬料板作用下直热式转筒干燥过程物料停留时间的计算提供一种参考。     

Modeling and simulation of drying characteristics on flexible filamentous particles in rotary dryers

Experiments were conducted to demonstrate the effects of the drum wall temperature on the heat and mass transfer in rotary dryers. The drying characteristics of flexible filamentous particles in rotary dryers were further explored. In addition, the inlet and outlet temperatures and moisture contents of granular particles were measured. As a result, the good agreement between the simulations and experiments verified the rationale and feasibility of the numerical method. Therefore, the approach was adopted to evaluate the temperature and moisture content of wet granular particles in a rotary dryer in different conditions, for instance, drum wall temperature and rotational speed. The results revealed that the higher drum wall temperature led to hotter particles with lower outlet moisture content. Conversely, the higher rotational speed resulted in cooler particles with higher outlet moisture content due to the decrease of residence time in the rotary dryer.     

THREE-ARC LIFTING FLIGHT

现有转筒烘干机的抄板不能把料撒在整个转筒内 ,而且撒料也不合理 .用力学理论和实验结合得出的三弧抄板克服了这些缺点 ,并且填充率高 (>2 0 % ) .如果用于工业生产 ,必将有显著的节能效果 .     

三弧抄板

现有转筒烘干机的抄板不能把料撒在整个转筒内 ,而且撒料也不合理 .用力学理论和实验结合得出的三弧抄板克服了这些缺点 ,并且填充率高 (>2 0 % ) .如果用于工业生产 ,必将有显著的节能效果 .     

Modeling of Fertilizer Drying in Roto-Aerated and Conventional Rotary Dryers

Conventional rotary dryers are equipped with flights placed parallel along the length of the shell to promote a rain of solids across the dryer section. In the roto-aerated dryer the hot air flows through the particles that run on the bottom of the drum through a series of mini-pipes and there is no cascading. This study analyzed heat and mass transfer modeling between the air and the fertilizer particles in conventional rotary and roto-aerated dryers, as well as the simulation results with the experimental data. A good agreement between the simulated and experimental results was obtained for the two rotary dryer configurations analyzed.     

FLIGHT DESIGN I N ROTARY DRYERS

The effectiveness of the rotary drum drying process depends primarily on the contact between the cascading particles and the drying gases within the drum. This paper considers first the factors which contribute to the cascade pattern and which influence the design of the lifting flights which distribute the particles in the top half of the drum. A generalised calculation design procedure for flights is developed and described in detail for the case of Equal Horizontal Distribution (EHD) flights. It is reasoned that the EHD flights, which have an equal distribution of particles across the horizontal diameter of the rotary drum dryer, give the optimum distribution in the context of the heat and mass transfer operations of the rotary drying process. An industrial design which approximates the optimum flight design is suggested.     

Simulation of Wood Particle Motion Through a Concurrent Triple-Pass Rotary Dryer

The retention time of solids in a drum is an important parameter for the design of rotary dryers, since it directly influences the mass and heat transfer rates. If it is too short, the wood particles do not become adequately dried. If it is too long, they become over-dried. Therefore, having an appropriate retention time is useful in terms of both energy and plant capacity. Wood particle mean retention time in a rotary dryer is affected by several variables, such as dryer dimensions, solid characteristics, and operational parameters. The purpose of this work was to simulate the effects of some wood particle characteristics and operational parameters on the mean retention time, drum holdup, and velocity of the wood particles during drying in a pilot-scale, closed-loop, triple-pass rotary dryer by means of a computer code. The simulation results of wood particle motion can be used for modeling, design, and optimization of closed-loop, triple-pass rotary dryers.     

EXPERIMENTAL STUDY ON DRYING OF CHILLI IN A COMBINED MICROWAVE-VACUUM-ROTARY DRUM DRYER

This paper presents new data on drying chilli in a microwave-vacuum-rotary drum dryer. This novel technique is designed to combine the advantages of vacuum drying and evenly dispersed microwave energy in a rotary drum. The drying kinetic and the specific energy consumption at particular product moisture content were measured experimentally. Moreover, the effect of pressure inside the chamber and the rotational speed of the drum were also determined.