回转窑托轮轴向受力的分析与检测

回转窑托轮的工作状态对窑整体的稳定运转有着重要影响,测量托轮所受的轴向力可以判断托轮的运转情况。文章阐述了测量托轮轴向受力的意义;分析了托轮轴向受力的产生原因;介绍了一种检测托轮轴向受力的机械装置,应用此装置可以方便准确测量托轮轴向受力的大小。     

回转窑筒体轴向弯曲变形和表面圆柱变形动态检测方法

回转窑的筒体轴向弯曲变形和表面圆柱变形对回转窑的稳定运行有着重要的影响,对窑筒体这二种变形的准确检测将可以判断回转窑的运行状态。文章阐述了测量窑轴向弯曲变形和表面圆柱变形测量的意义,分析了引起回转窑筒体轴向弯曲变形和表面圆柱变形的原因,介绍了一种可以在动态条件下测量窑筒体轴向弯曲变形和表面圆柱变形的方法,能准确测量窑筒体轴向弯曲变形和表面圆柱变形的大小。     

回转窑运行轴线实时监测系统的原理与实现

回转窑运行轴线实时监测系统基于Labview软件平台，通过监测托轮位移来实现对回转窑运行轴线的监测，不仅能解决回转窑在生产实际中的动态测量难题，而且能实时反映回转窑的运行状况。     

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。     

Gas-bubble hold-up and axial dispersion coefficient of emulsion phases in fluidized beds

A model for liquid mixing in a gas-liquid bubble column is extended to predict gas-bubble hold-up and axial dispersion coefficient of emulsion phases in fluidized beds. Reasonable agreement is found between the proposed model which includes no adjustable parameter and the available experimental data and correlations.     

回转窑大齿圈的安装与找正

根据回转窑大齿圈结构特点,阐述了回转窑大修中两个半齿圈组装、校正及筒体的安装、找正方法,重要工艺过程中的注意事项,在山东铝业公司#2窑大修中取得了良好效果。     

Prediction of gas hold-up and liquid velocity in airlift reactors using two-phase flow friction coefficients

The overall friction coefficient (K_f) of airlift reactors was estimated using equivalent lengths (L_eq) and friction factors ( f ). The friction factor was calculated taking into account the riser liquid velocity profile corresponding to the two-phase flow and using classical one-phase equations. A previously described model was used to obtain simultaneously both gas hold-up and liquid circulation velocity. The model simulates experimental data obtained in a wide range of configurations of internal (2 and 30 dm³ volume) and external (from 8 to 600 dm³ volume) airlift reactors with Newtonian (water and alcohol solutions) and non-Newtonian (carboxymethylcellulose (CMC) solutions) systems. Com-parison with other models from the literature yielded similar results.     

一种回转窑椭圆度的测量装置

利用椭圆度的定义和激光技术，提出了一种回转窑椭圆度的在线测量方法及装置。详细论述了测量系统及其测量原理、数据分析方法，并推出了筒体椭圆度的计算公式。     

Pyrolysis of oil sand from the Whiterocks deposit in a rotary kiln

A rotary kiln reactor was evaluated for thermal recovery of oil from Utah oil sands. A series of continuous-flow pyrolysis experiments was conducted. Process variables investigated included temperature (748–848 K), solids retention time (10–27 min) and sweep gas flow rate (1.27–2.83 m_s³ h⁻¹). The results indicated that the pyrolysis temperature and the solids retention time were the two most important variables affecting the liquid and gas yields. The liquid yield (C₅⁺]) decreased and the gas yield (C₁–C₄) increased with increasing temperature. The liquid yield increased with decreasing solids retention time, while the gas yield decreased. No significant effect of the sweep gas flow rate on the product distribution and yields was observed. The quality of the bitumen-derived liquids was significantly better than that of the bitumen. A preliminary process kinetics model which conforms to the observed trends was proposed.     

铜陵海螺5 000t/d国产化示范线回转窑技术指标设计与控制

在收集和整理大量大型现代干法预分解窑的基础上，采用统计分析的方法获得适合现代干法预分解窑的统计核算公式和回转窑工艺参数确定体系，并在铜陵海螺5000t/d生产线配套回转窑工艺参数确定中得到实际应用，实践证明，采用该方法建立的回转窑规格确定与能力核算体系用于现代干法预分解窑的设计是合适的，所设计的回转窑已达到设计指标，部分技术指标已达到当前世界先进水平。     

Mean residence time and hold-up of solids in rotary kilns

The influence of operational variables on the mean residence time (MRT) and hold-up of the solids in rotary kilns has been investigated by many researchers. However, their reports on the influence of the feed rate on MRT, for example, are not consistent with one another. In this study, experiments are conducted on a 400 mm ID pilot kiln with a cylindrical discharge dam. Sand is used as the testing solids. MRT and the hold-up are measured under various feed rates and rotation speeds. Experimental results indicate that MRT increases slightly with the feed rate, and that the gradient is smaller at high rotation speeds. The hold-up shows a near-linear increase with the mass of feed per kiln rotation. The experimental data are then used to test equations provided by different researchers for the prediction of MRT. Comparisons show that, results of the empirical equation from Sullivan, J.D., Maier, C.G., Ralson, O.C. [1927. Passage of solid particles through rotary cylindrical kilns. U.S. Bureau of Mines Technical Paper No. 384.] agree well with measurements for the cases of low kiln loadings, while the numerical model of Saeman, W.C. [1951. Passage of solids through rotary kilns: factors affecting time of passage. Chemical Engineering Progress 47, 508-514.] gives good predictions over the entire range of parameters considered.     

立窑水泥与回转窑水泥配制混凝土耐久性能的研究

用立窑和回转窑生产的５２５号Ⅱ型硅酸盐水泥配制Ｃ３０混凝土来对比它们的耐久性能。实验结果表明：优质立窑水泥配制混凝土的抗渗性、抗碳化和抗海水腐蚀性能不如回转窑水泥,而抗冻性、收缩性、钢筋锈蚀性能与回转窑水泥相近。此外,４２５号普通硅酸盐水泥中混合材的品种、质量对混凝土耐久性能影响很大,石灰石作混合材可显著改善立窑水泥配制的混凝土的耐久性能,而烧粘土作混合材则严重损害混凝土的耐久性。     

Independent prediction of slip velocity and hold-up in liquid/liquid extraction columns

The correlation of slip velocity using a large bank of published data for pulsed perforated-plate, Karr reciprocating-plate, rotating disc and spray extraction columns is presented. Based on more than 3,700 data points with and without mass transfer, empirical equations not including hold-up for each of the columns are suggested which reproduce the slip velocity data over a wide range of variables. Explicit correlations for hold-up in both the loose and dense-packed regions of operation in spray columns are also presented which do not involve slip velocity. The equations presented are more exact and simpler to use than previous empirical correlations; these often involve the characteristic velocity which is difficult to accurately predict.     

回转窑尾气脱硫系统技术改造

介绍了DS-SO2尾气处理系统在郴州丰越环保科技有限公司回转窑煅烧车间的应用情况。为解决原有回转窑尾气脱硫系统运行费用较高的问题,采用DS-SO2尾气处理系统代替原来的钠碱法脱硫系统,减排效果明显,经济效益显著。改造后尾气SO2脱除效率达到99%以上,尾气排放ρ(SO2)≤1 mg/m3、ρ(NOx)≤60 mg/m3、颗粒物(ρ)≤10 mg/m3,远低于气体污染物排放限值要求;每年可节约成本约752万元,取得巨大的经济效益。     

回转窑筒体不正常窜动调整方法实践

生产中回转窑筒体正常的窜动是有益的,但不正常窜动必须加以重视并控制。根据现场安装调试的实际经验并结合理论分析,详细介绍了回转窑筒体不正常窜动的影响后果;并对不正常窜动的判别方法、不正常窜动调整方法及注意事项等内容,进行了归类总结和分析介绍。     

立窑水泥与回转窑水泥对混凝土减水剂适应性的研究

研究了立窑水泥和回转水泥与混凝土减水剂的相容性。实验结果表明,与回转窑水泥相比,优质立窑水泥配制混凝土的减水率与回转窑水泥相近,但凝结时间大幅度延长。适当细磨可以缩短含氟立窑水泥配制混凝土的凝结时间,但无法消除立窑水泥配制混凝土凝结时间偏长的缺点。     

回转窑运行振动原因分析及处理

根据南化公司磷肥厂各种规格回转窑运行及检修中振动原因的分析和处理经验 ,提出回转窑振动的基本现象和处理方法     

煤、风配合对回转窑煅烧石灰的影响浅析

在回转窑煅烧石灰的过程中,煤、风、料的配合决定了产品的质量、产量,直接影响到公司的经济效益;除此之外,还取决于设备的选型和装配状况。本文将针对固有设备状况下如何稳定热工制度,合理的调配煤、风的比例,在不对设备作大的改动或更换的前提下最大限度地提高回转窑的产量和产品的质量展开分析。     

回转窑人工智能专家系统的应用实践

根据水泥熟料煅烧过程操作控制原理研发的"回转窑人工智能专家系统"采用了人工智能模拟技术、实时数据清洗技术、控制数据关联匹配技术。该系统由分解炉出口温度自动控制系统、篦速自动控制系统和氨水用量自动控制系统三个模块组成。该系统投运后,分解炉出口温度控制有效率由之前人工控制的平均60%~70%提高至平均80%~95%;篦下压力和二次风温稳定性提高;氨水消耗量下降显著;窑系统投料量增加10 t/h左右,熟料标准煤耗降低2.85 kg/t,熟料强度均有提高。