基于Delphi平台的喷雾干燥塔喷管故障在线监测软件的开发

针对喷雾干燥塔喷管堵塞的问题,引进自动控制的思想,提出使用Delphi平台,开发一套喷雾干燥塔喷管故障在线监测 系统。基本过程是:现场测量的振动频率信号,经过调制解调器、PLC处理后传输到PC机中,再对输入的信号进行实时 分析诊断,实现故障的在线监测和可视化。文中重点对PC机处理信号、实现在线监测和可视化软件开发的技术问题进 行了讨论。     

钠碱法脱硫问题的研究与探讨

介绍了某企业钠碱法烟气脱硫工艺流程,针对系统运行过程中出现的逆喷管堵塞、上液管道振动及压滤系统污泥黏稠等问题,通过对烟气温度、逆喷管结构、结晶机理、管道冲击力、混凝剂及絮凝剂特性等进行分析,找到合适的解决办法,实施后问题得到改善,保证了系统的安全平稳运行。     

涡街流量测量中一种振动信号识别方法的研究

基于流体振动原理的涡街流量计对振动干扰尤为敏感,为解决振动问题对涡街流量计发展的影响,通过实验证明了管道振动方向的多样性,同时基于涡街载荷方向的单一性提出了通过方向区分振动信号和涡街信号的新思路。为验证这一思路,将MEMS加速度计安装在探头末端,在振动条件下采集实验信号。实验结果证实:加速度计在3个方向上检测到了不同的信号,通过不同方向的加速度信号能够对涡街信号和振动信号进行有效区分。     

基于分形维的锚杆有效振动信号特征的提取方法

振动信号特征的有效提取是动态信号分析与处理过程中的关键技术.根据振动过程中的能量特性,对锚杆的振动特性和能量之间的关系,用ANSYS/LS-DYNA软件对锚杆在脉冲激励下的动态信号进行模拟,分别得到了未张拉和张拉状态下的振动幅度波形,通过MATLAB程序重现波形,然后采用分形维的方法对振动波形进行处理,获得了振动波形的初至以及整周期位置,从而证明了基于分形维的有效振动信号特征提取的可靠性.     

振动频谱分析在立磨减速机故障诊断中的运用

振动频谱分析技术是设备智能巡检系统和在线监测系统的一个重要模块,振动分析通过使用振动传感器对现场转动设备的振动信号进行采集,形成趋势图、频域图、时域图,通过系统的倒谱、细化谱、包络解调等高级分析工具对各种图谱进行处理,从而确定设备的故障点、故障情况、故障原因,并提出检修建议.对采集的振动信号用高级分析工具进行分析,查找...     

压缩机转子与运动件碰撞的振动特征简析

引起大机组转子振动异常的因素很多 ,本文以泸天化尿素装置CO2 压缩机高压缸转子振动异常的故障为例 ,通过对其症兆信号与常见故障特征信号的分析比较 ,提出了转子与运动件碰撞引起振动异常的一些特点 ,期望以此对大机组类似故障的诊断有所裨益     

振动流化床中流动结构的混沌分析

在内径90mm、静床高800mm的高床层流化床中,用动态压力传感器检测了不同气速条件下普通流化床和振动流化床中沿轴向的压力脉动信号,通过小波变换对信号除噪后,用混沌理论对信号进行了分析.通过关联维数和Kolmogorov熵定量表征振动流化床中的流动结构特征.结果表明:压力脉动信号的关联维数和Kolmogorov熵能够描述振动流化床中的流化状态;振动流化床中床层的流动结构存在两个区,在近分布板区域为射流区,床层主体部分为均匀流化区.     

化肥厂旋转机械故障诊断的应用探讨

本文在阐述机械故障诊断现状的基础上,总结并分析了机械滚动轴承故障的主要形式,并提出了机械滚动轴承的振动信号分析诊断方法,最后通过一具体例子进行了基于振动信号的故障诊断方法的应用探讨。     

水泥磨电机的振动测试与故障诊断

采用振动测试的方法,通过对传动系统振动信号的时域、频域和幅值域分析,实现了对水泥磨电机的故障诊断。该方法对其它同类大型旋转机械的故障诊断具有参考价值。     

基于BP神经网络的油气管道振动检测系统

为了及时对管道振动入侵信号进行分析和识别，采用LabVIEW和Matlab联合编程的方式，开发了管道振动检测系统。首先以长输管道模拟实验装置系统试验数据为基础，模拟试验不同振动工况下的信号，后通过Matlab程序对信号进行去噪、特征提取和模式识别处理，最终获得管道振动检测系统。通过实验对比，经去噪和特征选择后的信号在BP神经网络识别中的速度和精度两方面的性能表现均优于未经去噪和特征选择的信号。采用BP神经网络进行模式识别，较SVM具有更高的识别准确率。该系统能够准确识别管道振动信号，报警正确率达95%，拥有良好的检测可靠性，符合未来管道的智能化发展道路。     

SPRAY DRYING HANDBOOK

ABSTRACT

A mathematical model is presented to predict the drying rates and energy consumption for the process of impingement steam drying of paper during the constant-rate drying period. Preliminary experiments have verified the validity of the simulation model. The predicted results show consumption may be as low as 640 kJ/kg water evaporated while hot air Yankee dryers typically consume 5020 to 7100 kJ/kg water evaporated     

空气静电喷枪喷涂工艺探讨

阐述了空气静电喷枪的结构、使用、安全和工艺条件,并与普通空气喷枪喷涂工艺、效果和涂料利用率进行比较。简述该工艺的优越性。     

HIGH-TEMPERATURE SPRAY DRYING

This paper summarizes the results of long-term studies on high-temperature spray drying performed at the Institute of Engineering Thermophysics in Kiev. Two-stage processing involving evaporation followed by drying is proposed to dewater very dilute and temperature-sensitive materials. A new calculation procedure, which accounts for the gas-particle flow pattern and process kinetics, is given along with the performance data for selected drying plants designed according to the procedure developed.     

FULL CONTAINMENT SPRAY DRYING

ABSTRACT

Aspects of safety, environmental protection, and powder quality will continue to influence advances within spray dryer design and operation, and the concept of full containment spray drying offers a means to meet future industrial requirements. Process air recycle and powder containment within the drying chamber leads to no process air discharge to atmosphere, provides a more favorable operator environment around the spray dryer installation, reduces regions within the dryer layout where potential explosive powder/air mixtures can exist, improves yields, reduces powder losses, and provides easier cleaning operations with reduced wash water requirements.     

MICROENCAPSULATION BY SPRAY DRYING

Abstract

Spray drying technique has been widely used for drying heat-sensitive foods, pharmaceuticals, and other substances, because of the solvent rapid evaporation from the droplets, Although most often considered a dehydration process, spray drying can also be used as an encapsulation method when it entraps ‘active’ material within a protective matrix, which is essentially inert to the material being encapsulated. Compared to the other conventional microencapsulation techniques, it offers the attractive advantage of producing microcapsules in a relatively simple continuous processing operation. This chapter will present a brief overview of the main considerations involved in the application of spray drying for microencapsulation, with a special emphasis given to microencapsulation of volatile materials. The potential use of spray drying microencapsulation for pharmaceutical applications, particularly the preparation of microparticulate drug delivery systems, will also be discussed     

SCALE-UP OF SPRAY DRYERS

Abstract

Commercial success of a new spray dryer investment depends upon the dryer meeting its specified performance in all respects, and this puts great importance on the scale-up procedures used in the projecting of the new spray dryer. Scale-up still relies heavily on the experience of the designer. However, as the applications and specifications become more and more complex, so does the need for improved test work in pilot plants, and computational fluid dynamics simulations become more important, so that better scale-up tools are available to minimize the possibility for personal errors that may lead to the new dryer investment becoming an unsuccessful commercial venture.     

SCALE-UP OF SPRAY DRYERS

Commercial success of a new spray dryer investment depends upon the dryer meeting its specified performance in all respects, and this puts great importance on the scale-up procedures used in the projecting of the new spray dryer. Scale-up still relies heavily on the experience of the designer. However, as the applications and specifications become more and more complex, so does the need for improved test work in pilot plants, and computational fluid dynamics simulations become more important, so that better scale-up tools are available to minimize the possibility for personal errors that may lead to the new dryer investment becoming an unsuccessful commercial venture.     

MICROENCAPSULATION BY SPRAY DRYING

Spray drying technique has been widely used for drying heat-sensitive foods, pharmaceuticals, and other substances, because of the solvent rapid evaporation from the droplets, Although most often considered a dehydration process, spray drying can also be used as an encapsulation method when it entraps 'active' material within a protective matrix, which is essentially inert to the material being encapsulated. Compared to the other conventional microencapsulation techniques, it offers the attractive advantage of producing microcapsules in a relatively simple continuous processing operation. This chapter will present a brief overview of the main considerations involved in the application of spray drying for microencapsulation, with a special emphasis given to microencapsulation of volatile materials. The potential use of spray drying microencapsulation for pharmaceutical applications, particularly the preparation of microparticulate drug delivery systems, will also be discussed