PX420密炼机及TDE11双螺杆挤出压片机自动控制系统及拖动系统简介

介绍引进的意大利POMINI公司PX420密炼机及TDE11双螺杆挤出压片机的自动控制系统和拖动系统以及其远程诊断系统，其自动控制系统采用现场PLC和上位机PC通过转发器连接，其软件采用中文界面，可提供工艺数据和曲线，并可通过远程诊断系统向设备生产厂咨询。设备自动化程度高，操作方便．运行可靠、稳定。     

CENTUM-CS1000 在聚合干燥工艺中的应用

介绍了新疆石河子中发化工有限责任公司聚合干燥工艺采用CFNTUM1000集散控制系统的情况。CENTUM 1000集散控制系统将DCS与PC机结合,可实现站间相互通讯、状态监视、控制操作、数据管理等开放型网络控制．该系统投运后,生产非常稳定,提高了产品产量及质量,降低了劳动强度。     

磨头短程烘干机的应用

干法生产必须将原燃材料烘干，而一些混合材也必须进行干燥处理。采用有效的干燥工艺和设备，摆脱原材料水分对球磨机及其它设备的影响是我们研制和应用磨头烘干机的目的。１传统烘干工艺的弊端１．１设置独立的烘干工艺线其工艺过程大致为进料—烘干—输送—储存—库底卸料—提升—配料—入磨，它们都存在如下几方面的问题：１）工艺线长，配套设备多，维护费用大，建设投资高，装机容量大。如Φ２．４m×１８m烘干系统装机总量为３２８．５kW，烘干电费高。２）热能损耗大。出烘干机的烟气一般为１２０℃左右，经收尘后直接排空。如Φ２…     

基于太阳能的工业物料干燥技术研究

以工业废料(铬渣)为干燥对象,研究探索利用太阳能干燥工业物料的方法和技术。在研究物料的物理特性与传统的干燥工艺的基础上确定了基于太阳能的物料干燥工艺;对空气集热器模型进行试验、优化,得出空气集热器的主要技术参数;利用计算机三维造型,设计了适于铬矿渣烘干的隧道式烘干窑和干燥架;最终设计出由太阳能空气集热器、常用的热风炉和隧道式烘干窑组合而成的混合型干燥系统。经理论计算与虚拟实验,用于工业物料的干燥是可行的。     

小型实验室干燥动力学测试系统设计

对流式风洞干燥实验台是进行干燥基础与技术应用研究的必备实验装置。针对闭式循环、自动参数检测及数据采集等试验台必备功能,对小型实验室干燥动力学测试系统进行了工艺及装备设计,用于测量干燥动力学曲线和平衡数据。该系统可对干燥过程中干燥介质的温度、流量、湿度及物料的湿含量等参数进行在线测量与记录。     

可编程序控制器在石灰窑上料系统上的应用

本文阐述了可编程序控制器PC机在石灰窑上料系统上的应用情况。介绍了PC机的装置结构、工作原理、技术性能及使用效果。石灰窑上料部分的PC控制系统主要由值班室、操作室以及现场对上料过程控制的开关量的输入信号操作和控制电动机、物料称等其它执行、显示器件的输出信号操作构成。PC本身输入与输出信号之间的逻辑关系,由生产工艺条件确定编程输入PC执行,完成对石灰窑上料系统的自动控制。PC机体积小,性能可靠,使用安全灵活,控制线路简单,便于维护等诸多优点在应用中已充分显露出来,这是继电器控制方式所无法比拟的。     

陶瓷砖放射性试验自动进样控制系统的研制

研制了一种用于陶瓷砖放射性试验自动进样的控制系统。该系统采用"PC+运动控制卡"的控制方案,通过运动控制卡产生的脉冲和方向信号对伺服电机进行控制,实现样品室的开合和机械手自动取样的三维运动控制,PC机作为上位机使用VC++设计人机交互界面软件,对试验过程中的各个参数及试验状态进行实时监控。试验结果表明,该系统能够完全满足系统运动控制的需要,且系统软件具有开放性,容易移植,系统维护和操作方便。     

烘干节能技术

原燃材料烘干是水泥生产的重要环节。但立窑水泥企业的烘干工艺及设备很不健全,至今还有许多企业仍主要依靠太阳晾晒的办法来代替烘干工艺,这不仅不能保证物料在生产过程中的水分指标要求,而且严重影响了企业的厂容厂貌和文明生产。现代立窑企业必须建立健全物料的烘干工艺,并且要大力应用烘干节能技术。1快速沸腾烘干技术1.1工作原理快速沸腾烘干技术由三个部分组成。即:供热系统、热交换系统、通风除尘系统。烘干物料种类:粘土、煤、铁粉、矿渣、石灰石及各种湿料。入机物料水分15%～40%,出机物料水分1%～3%。快速沸腾技术的工艺流程见图1…     

环己酮生产中碳酸钠回收干燥装置的设计与分析

针对环己酮生产过程中废碱碳酸钠回收利用的工艺特点,设计了一种新型干燥装置,对干燥器的干燥流程、干燥器的结构和工作原理进行了分析及计算。结果表明:循环自动干燥碳酸钠设备主要由干燥箱、供热风系统、抽湿系统、扩散系统和包装系统组成;通过温控由电烘箱进行碳酸钠干燥实验,得到了碳酸钠干燥设备的干燥曲线,该系统干燥能力达1～2 t/h,干燥后碳酸钠含水率小于2%;该系统利用工厂废烟气作热源,节省干燥成本,且无环境污染。该设备干燥能力大,热效率高,能耗低,调控性能好,很好的解决了环己酮工业中废碱处理的难题。     

循环热风低温干燥系统湿空气冷凝特性分析

基于能量梯级利用热力系统耦合理论，集成了一种适合热敏性农副产品烘干的新型空气干燥循环系统，系统可得到热敏性干燥产品，同时回收湿空气冷凝废热用于有机朗肯循环(ORC)系统对外做功。对关键部件湿空气冷凝器建立传热传质数学模型并经实验验证，考察了关键操作参数对系统脱水速率及节能效果的影响。结果表明，湿空气湿度是影响该系统凝水和节能的最关键参数，该系统凝水及节能特性均随湿空气湿度提高而改善；当干燥箱出口湿空气含湿量温度一定时，新型空气干燥循环凝水量主要受到干燥箱出口空气流量的影响，系统的凝水量和换热量均随湿空气质量流量增加先增加后降低，在0.10~0.15 kg/s出现极大值；系统净输出功随ORC底循环蒸发温度提高显著增加。本系统下的热敏性农副产品烘干建议选择低空气流速、低烘干温度，推荐的ORC底循环蒸发温度为313~323 K。     

Optimization study of soybean intermittent drying in fixed-bed drying technology

Intermittent drying of materials is an alternative operation that aims at reducing energy consumption, improve the preservation of dried products or decrease effective drying time. Intermittent drying supplies the system with time-varying input air properties that are opposite to traditional operations, where air properties are constant at the dryer inlet. The major objective of this study is to establish the most satisfactory patterns of air temperature and velocity modulation at the dryer entrance to reduce energy consumption. This optimization study was based on a heterogeneous model for the drying of grains in fixed bed validated with experimental data. Intermittent and conventional operation experiments were conducted using equal energy consumption, and the influence of air temperature and velocity modulation on the drying rates related to the percentage of evaporated water were assessed. Results indicated that higher drying rates can be achieved under intermittent operation, and the validated model based on these results could reasonably predict temperature and moisture content profiles. Simulations pointed out that the best modulation patterns of air properties is a function of a variety of system conditions such as initial temperature and moisture content of both soybean and drying air. However, a tendency to reduce energy consumption was observed when the system operation is initially at high temperature and constantly at low velocity.     

S7-300PLC在煤泥干燥控制系统中的应用

根据选煤厂煤泥干燥控制系统配置要求,介绍了自动控制系统的软硬件组成。为了满足煤泥干燥系统工艺的要求,采用PLC对煤泥干燥系统进行控制,使整个系统更加稳定、可靠,提高自动化程度。着重介绍了利用西门子编程软件STEP7设计煤泥干燥系统自动控制的方法,并对开发过程中遇到的问题及解决方法进行了分析。     

Optimization of the microwave drying process for potato chips based on the measurement of dielectric properties

A microwave drying system with functions of automatic power and temperature control was developed to dry potato chips. The mass and moisture content of the sample are available online. The dielectric properties of the samples were measured during microwave drying, during which the microwave absorption capacity of the samples was analyzed. Afterward, a reasonable power and temperature control scheme was formulated. The enhanced microwave drying technology of potato chips is found by comparing product quality under different schemes. Results show that the change in the dielectric properties of materials during microwave drying is closely related to moisture and temperature variations. A three-stage different temperature control with predefined variable power profiles resulted in the best product quality.     

新型干燥设备在硫精矿干燥中的应用

介绍了新型干燥设备双螺旋干燥机和盘式干燥机结构及其应用情况。与传统回转干燥机相比,新型干燥设备具有热效率高、干燥能力大、设备不易粘结、占地面积小、操作环境好、生产成本低等优点。该新型干燥设备在400kt／a硫铁矿制酸装置上的成功应用为我国硫精矿干燥提供了一条高效：节能、环保的新途径。     

PVC树脂干燥系统的改进

通过比较PVC生产中旋风干燥和旋流干燥两种PVC浆料干燥工艺,指出旋风干燥工艺具有设备少、易操作的优点,并介绍了干燥系统中旋振筛、空气加热器等设备的改进情况.     

Machine learning in drying

Abstract

Although very important for analysis of drying processes, physics-based models are limited in terms of their prediction ability and in most cases are unsuitable for real-time process control and optimization of industrial drying. In this paper, we provide an overview of the machine learning (ML) techniques and the state-of-the-art ML applications in drying of food and biomaterials. The applications include but not limited to data-driven models, nonlinear control and multi-objective optimization. The advantages of integration of ML with machine vision for real-time observation of product quality and fine-tuning control strategies are briefly discussed. Future research should focus on the integration of ML software tools with sensors to measure process and product variables. In addition, the drying research community should contribute towards building of open-source datasets, which is extremely important to leverage the power of ML algorithms. Integration of sensors, process analysis and software engineering will enable the development of “intelligent” drying systems.     

钛风机在氯气透平压缩机干燥系统中的优化控制

介绍了在隔膜电解系统中,钛风机在氯气透平压缩机干燥系统中的优化控制。     

A recurrent self-evolving fuzzy neural network predictive control for microwave drying process

A recurrent self-evolving fuzzy neural network (RSEFNN) predictive control scheme is developed for microwave drying process in this paper. During microwave drying process, the temperature, power absorption efficiency, and moisture variation characteristic in the drying material cannot be exactly known for the complex application environment. So a RSEFNN is constructed to predict the microwave drying process. Based on the RSEFNN, to achieve a highly efficient and safe microwave drying process, a multiple objectives predictive control algorithm is constructed to get a suitable input power over a prediction horizon. To identify the feasibility of the proposed recurrent self-evolving fuzzy neural network predictive control (RSEFNNPC) algorithm, a simulation of Red Maple and an actual application of lignite drying were analyzed in this paper. In the Red Maple drying process, temperature and moisture content are chosen as control objectives. As the simulation results show, the RSEFNNPC could achieve multiple objectives optimization. In the actual lignite drying process, the difference between lignite temperature and presupposed temperature was below 2?K. The difference between RSEFNN prediction and actual sampling temperature was below 1?K.     

振动床混流干燥系统热效率研究

振动床混流干燥系统由热风系统、干燥系统和除尘系统三部分组成,旨在降低褐煤水分,提高单位褐煤的发热量,以提高褐煤质量。由于振动床混流干燥是一种新型干燥系统,因此需要对干燥系统进行测试,并研究振动床混流干燥系统的热效率。通过现场测试,针对不同煤流量分别测得干燥系统进出口的温度、湿度、风量及测定干燥前后煤样的水分及发热量。采用了熵焓值计算方法,得出干燥不同煤量所需的理论风量。通过对比理论风量与测试风量,分析研究干燥系统的热效率,找出干燥效果不佳的直接原因和干燥系统改进的方法,为振动床混流干燥系统的改进提供理论支持。