预热器撒料盒实验仿真计算研究

撒料盒作为预热器风管的重要组成部分,对生料的分散和气固换热影响重大。为了提高计算机仿真模型对撒料实验计算的准确性,利用实验数据对模型的部分参数进行了修正,并对比了模型修正前后计算结果变化以及与实验的误差,同时分析了造成误差的原因。     

撒料盒的数值模拟仿真研究

物料在风管中的分散效果是影响预热器系统换热好坏的主要因素,而影响物料分散效果的主要因素之一——就是撒料装置结构,对其尺寸设计及内部翻板设计主要取决于经验值.为此采用ANSYS Fluent软件进行流场分析,得出物料颗粒经撒料盒装置到风管里的运动轨迹、平均停留时间等相关参数,验证设计结构是否合理.同时对影响物料流动的因素如:各入口空气流速、翻板角度等进行比对,本文主要对翻板角度进行阐述,以物料的运动轨迹和停留时间为主要判断依据,找出最佳参数,从而辅助撒料盒的设计.     

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     

空气选粉机机械式撒料盘的试验研究

本文对空气选粉机不同型式撒料盘进行了运动分析,并通过试验得出符合分析意见的结果,对撒料盘的改进与设计有一定的参考价值。     

预热器撒料性能的实验研究

本文对不同结构型式撒料装置在不同状况下撒料性能进行研究,采用实物大小的模型系统试验了撒料板角度从0°-45°撤料板插入深度从0～300mm及改变撒料板宽度和高度等不同状况下物料的分散情况,通过实际测量撒料高度及数学计算的方法来分析研究不同状况下物料的分散效果,从而得出使物料允分分散的最优型式的撒料装置,为实际工程应用的预热器开发提供了很好的设计依据.结果表明,撒料板角度为5°,插入深度为200mm时物料分散情况最好.     

涡流分级机撒料盘的试验研究

研究了涡流分级机撒料盘上凸棱高度对分级精度和分割粒径的影响。试验得出,随着径向凸棱高度的增加,物料分散变差,分割粒径ｄ５０减小,分级精度指数降低。在试验范围内,当撒料盘凸棱高度与内径之比为００３７时,分级精度指数最高。     

三次风管积料原因分析及节能建议

从设计、原燃料、操作等方面分析了三次风管积料的原因,针对生产线热耗和电耗较高的问题进行了分析,并针对三次风管积料问题和能耗高的问题提出了节能建议。     

预热器撒料装置对回转窑煅烧的影响

某公司4　000t/d生产线窑尾采用单系列五级预热器和CDC管道式分解炉,生产过程中出现过多次因预热器系统撒料装置失效导致回转窑投料不成功的工艺故障,本文对其中两次故障进行分析。     

预热器上升管道撒料位置改进及效果

针对某5 000 t/d水泥熟料生产线烧成系统在运行中存在的问题进行了分析,发现预热器连接管道较短、撒料装置位置较高,导致气料的换热距离不足。对C₅-C₄连接管道上的撒料装置位置进行下降技改后,预热器的换热效果显著改善。高温风机转速下降了17 r/min,熟料标准煤耗约降低了1 kg/t,同时熟料的综合电耗也有所下降。对于提高水泥生产线的能效、降低运行成本具有重要意义。     

生料立磨出风管塌料问题的处理

从生料立磨出风管塌料的影响因素入手,通过现场技术改造、工艺操作控制,将立磨因出风管塌料振停故障全部排除,彻底解决了生料立磨出风管塌料振停对设备及运行指标的影响,达到了预期的改造效果。     

高温取热炉入口烟气管道撕裂原因分析

某厂重油催化裂化装置再生气高温取热炉入口管道投用一个月后,在靠近设备嘴子处裂开一个约300×250mm的口子,使装置停工三天,造成了很大的经济损失.     

Three‐Dimensional Numerical Simulation of Dense Pneumatic Conveying of Pulverized Coal in a Vertical Pipe at High Pressure

A two‐fluid model based on the kinetic theory of granular flow was used to study three‐dimensional steady state flow behavior of dense phase pneumatic conveying of pulverized coal in a vertical pipe, where the average solid concentration ranges from 11 % to 30 %, and the transport pressure ranges from 2.6 Mpa to 3.3 Mpa. Since the solid concentration is rather high, a k–?–k_p–?_p model which considers the turbulence interaction between the gas and particle phase, was incorporated into the two‐fluid model. The simulation results including profiles of gas and particle phase axial velocity, profiles of solid concentration, profiles of the turbulence intensity of the particle phase, as well as the value of the pressure gradient were reported. Then, the influences of solid concentration and transport pressure on the flow behaviors were discussed. The experiment was also carried out to validate the accuracy of the simulation results which showed that the predictions of pressure gradient were in good agreement with the experimental data. Simulation results indicate that the location of maximal solid concentration deviates from the pipe center and the deviation becomes more obvious with the solid concentration increasing, which is analogous to the phenomenon in the liquid/solid flow. Besides, pressure gradient declines as the transport pressure decreases, which is validated by experiment described in the paper. Moreover, the analysis indicates that it is necessary to consider the turbulence of particles for the simulation of dense phase pneumatic conveying at high pressure.     

The Solubilization of Disperse Dyes by Dispersing Agents at 127°C

The solubilities in water at 127°C of eight disperse dyes of various structures have been determined, as well as the effect of eleven different dispersing agents on the solubilization of these dyes. A special cell was designed for these experiments. While the solubilities of six of the eight dyes are similar and those of the remaining two larger by approximately one order, solubilization by dispersing agents covers a wide range of values. No clear pattern of dye-dispersing agent interaction has emerged from the work, especially with regard to the effects of dye structure, and a more detailed investigation is therefore being undertaken.     

高浓度H2O-NH3-CO2体系汽液平衡计算

A vapor liquid equilibrium model and its related interactive energy parameters based on UNIQUAC model for the H2O-NH3-CO2 system without solid phase at the conditions of temperature from 30℃ to 90℃,pressure from 0.1 MPa to 0.4 MPa, and the maximum NH3 mass fraction up to 0.4 are provided. This model agrees with experimental data well (average relative error ＜ 1%) and is useful for analysis of industrial urea production.     

重灰煅烧炉配套闪发器的工艺计算

简要介绍我公司新建40万t/a水合法重灰装置中重灰煅烧炉配套闪发器的工艺计算。     

Ⅴ型滤池进水闸孔断面计算

对Ⅴ型滤池的气动闸门和手动闸板的断面面积进行了实例计算,并作了讨论。     

螺杆式固体物料输送装置应用于下行床入口的小型实验

将螺杆式进料器应用于下行床热态小试实验装置的入口进行催化剂的输送,考察了出入口压差、下行风量、温度等因素对输送速率的影响. 结果表明,可以通过调节顶部压力比较灵活地控制进料速率.