文丘里管及拉法尔管在气力输送系统中的应用

对气力输送系统各种供料器的性能、特点和使用场合进行比较，重点讨论了传统的文丘里式供料器在实际应用中存在的问题。介绍几种国内外新型文丘里式供料器的结构、特点和用途。指出采用组合式供料器，即将文丘里式供料器与机械旋转式连续供料器组合使用，可以同时改善两者单独使用时存在的问题。介绍了拉法尔管在密相气力输送系统中空气流量控制方面的应用，指出拉法尔管在气力输送系统中主要起稳定空气流量和压力的作用，使输送过程稳定、均匀。     

全自动小粉料称量系统的设计

介绍胶料混炼用全自动小粉料称量系统的设计。机械部分为积木式拼装结构,供料器采用无级变速电磁振动供料器,除尘器采用脉冲袋式除尘器,解包室和料仓根据粉料性质设计,控制系统与上位机软件系统相互配合,实现粉料全自动称量。该系统组装灵活,具有自动化程度高、称量精度高,数据处理能力强、生产环境清洁等优点,适合大批量混炼胶生产使用。     

气力输送系统技术和部件的新进展

随着社会发展、市场需求的变化和环保要求的日益提高，气力输送技术面临着许多新课题。介绍了国外开发的高浓度物料低速气力输送、带多级喷射真空发生器的气力输送装置，细粉的收尘技术，管道中料流流动的改性技术，以及几种供料器和耐磨Dome阀等的工作原理和结构，使气力输送技术达到了高效、节能、无污染、自动化程度高等目的，以适应市场需求的变化。     

压入式气力输送装置在磷铵生产中的设计与应用

介绍压入式气力输送装置，输送磷铵包裹剂硅藻土及该装置的设计计算实例即：压缩空气量和输送管道内径计算；喷射式供料器的喷嘴内径计算。     

袋式除尘器下料器的改进

我厂2500t／d生产线使用的LPL系列气箱脉冲袋式除尘器，其下料器大多数是星型下料器。该下料器主要存在以下问题：     

机立窑撒料器的改进

我厂有２台Φ２．５ｍ×１０ｍ的机立窑,原采用的 立窑撒料器结构笨重,体积庞大,立窑顶部基本上是 敞开的,从窑顶住外漏烟现象严重,并时有ＣＯ中毒 的人身事故发生,夏天高温季节这种现象更严重。另 外,窑顶敞开,烟气大,温度高,给工人维护和检修设 备增加了许多不便利,为此,我们对撒料器进行了改 进。 １原撒料器存在的问题 原撒料器如图１。 在生产使用过程中,其主要存在以下问题： １）带齿加料锥斗大头直径Φ１４２０ｍｍ,由于密封 性不好,立窑的烟气大量从窑顶冒出,曾出现过ＣＯ 中…     

新型直线解耦式电磁振动供料器的控制系统设计

本文设计了基于单片机ATmega16、可控硅SCR和LC0101压电加速度传感器的闭环控制系统,并对直线解耦式电磁振动供料器进行控制。解耦式振动料槽具有垂直和水平两个方向上的振动,它们相互独立,可分别进行控制。控制系统以单片机系统为核心,根据传感器信号对料斗进行实时控制。     

解决重力混料器的故障

塑料加工商需要了解重力混料器在工作中最容易出现的问题。如果对重力混料器使用、维护不当，就会造成物料的浪费或废品现象。     

在机器内如何正确配色

在机器内进行配色相对简单，效率更高，因而受到加工商的青睐。但是在实际操作中如何选择进料器以及如何使用进料器以尽可能地降低着色成本是加工商不得不面对的问题。[编者按]     

立磨回转下料器的改造实践

我公司生料磨使用ATOX50磨机，喂料锁风装置采用回转下料器，设备运行过程中，易出现黏性物料的黏挂结块，造成黏湿物料的堵塞，经常出现因卡硬物、噎料原因造成故障停机，增加了人工清理时的劳动强度。在运行至中后期和雨季料湿时问题更加突出，据统计年均因回转下料器故障引起磨机跳停20余次。     

Austragorgane und Austraghilfen

Feeders and Discharge Aids. Feeders and discharge aids have an influence on the flow behaviour of bulk solids in silos. Together with the geometric form of the silo, they are responsible for the operating conditions of a silo. Therefore, feeders and discharge aids have to be chosen and installed under consideration of the flow properties of the bulk solid to be stored. The necessary information is obtained by using the silo design method due to Jenike. This method yields the geometrical data of the hopper (wall steepness, outlet diameter) necessary for a troublefree operation (no doming and ratholing; mass flow; no segregation; uniform flow). Furthermore, the design of feeders and discharge aids plays an important role in determining their function. For example, stagnant zones will build up and cause flow problems on protruding edges and on walls which are not steep enough. For the correct function of the hopper/feeder combination it is important to make sure that the feeder fully activates the hopper outlet and stagnant zones cannot build up. This can be ensured by an appropriate feeder design (increasing capacity in direction of conveying). The driving power of a feeder has to be calculated also on the basis of the flow properties of the bulk solid to be stored.     

封闭式旋转叶片给料机选型和计算

分析了各种旋转式叶片给料机的结构特点和工作性能。指出操作条件的不同引起倾注密度的变化对输送能力的影响，为用户正确选择给料机提供理论依据。     

Stand und Entwicklung der kontinuierlichen gravimetrischen Dosierung von festen und flüssigen Stoffen

State of the art in continuous feeding of solids and liquids . After defining the characteristics of continuous gravimetric feeding systems, the author lists the aims and reasons for the application of these methods in one- and multiple component systems. We can distinguish between gravimetric feeders with positive gross weighing and negative net weighing. The latter principle has advantages in operation, and is embodied in the weight-loss weigh feeders. A synoptic chart of the various gravimetric feeder designs shows the nature and the method of acquisition of the controlled value and also classifies the fields of application as to feed range and material characteristics. When designing a feeder, the weight and volume of material flow, the characteristics of the weight resolver and of the metering device have to be considered. Latest developments of the principal components of weigh feeders are illustrated by examples, such as metering devices for solids with poor flow properties, combination of feeding and pneumatic conveying systems, headload compensation with weight-loss weigh feeders, feeding with high instantaneous accuracy, gravimetric feeding of liquids at small feed rates, set point and ramp programming, and monitoring of the bulk density of the material.     

Design improvements on rotary valve particle feeders used for obtaining suspended airflows

The back repulsion of low density particles, sticking of particles in feeder valve and interlocking and cohesive archs of particles in feeder hopper have been widely observed problems of a conventional rotary valve feeder used for feeding of granular particles into an airflow line. In this study, these problems of the rotary valve feeders were isolated by means of novel modifications to its conventional design. Results of the modifications showed that the modified feeder can be sensitively used to feed granular particles with mass feeding rates ranging between 5±0.15 and 85±0.85 g/s without encountering problems experienced with conventional rotary valves.     

Variations of cell resistance and current distribution with current feeder configurations

Two models of current feeder configurations for resistive electrodes are presented, one in which the feeders were connected at the same end of a pair of electrodes of a unit cell and one in which connection was made at opposite ends. Expressions for the cell resistance and the current distribution were derived for these two current feeder configurations on the assumption of a linear type of overpotential. The cell resistance in the ‘opposite ends’ configuration was larger than that for the ‘same ends’ arrangement. Conversely, the current distribution in the former was more uniform than that in the latter. The relation between the total cell resistance and the number of current feeders,n, was obtained. An increase inn led to a decrease in the resistive loss of the electrodes by an amount corresponding to 1/n ², irrespective of current feeder configuration, when the resistance of the electrode was not so great as that of the solution.     

Influence of the Entrance Configuration on the Performance of a Non-Mechanical Solid Feeding Device for a Pneumatic Dryer

The solids feeder is an important component of a dryer, since it is responsible for introducing the moist material at controlled, specified rates. The purpose of this paper is to investigate the effects of solids feeding configuration on the fluid dynamic behavior of a 53-mm-diameter vertical pneumatic conveyor with a loop of 180°, aiming at further applications in drying granular materials. A non-mechanical solid feeding system constituted by a hopper connected to an inclined pipe was applied to feed type D particles in the conveying line. This simple feeding apparatus was modified through the insertion of different flow restriction devices at the air inlet, namely a reduction nozzle and a Venturi device. This was aimed at studying how the solids flow rates and the fluid dynamics of the whole conveying line are affected by the entrance configuration and inlet devices. The use of inlet devices combined with the non-mechanical inclined valve affected significantly the performance of the valve when operating with type D particles in a pneumatic conveying line. When using inlet devices, an increase in the conveyed solid flow rates at a given air velocity was observed. The reduction nozzle yielded a range of solids loading ratios similar to that of the inclined valve with no inlet device, and introduced some pressure instabilities at the entrance region. The Venturi device allowed operation at a wider range of solids loading ratios and no pressure instability was detected in the conveying line. For the conditions investigated, neither the gas velocity nor the loading ratio affected the extent of entrance length. The inlet devices may be successfully applied to modify and improve the performance of the inclined valve as a solids feeder in pneumatic dryers.     

高温输送用旋转给料器结构的比较

生产装置热氮高温输送旋转给料器为2台星形转子给料器,2台给料器工况相似,但给料器结构有很大不同。对2台给料器的转子、轴封结构、端面、密封形式以及使用维护做了分析比较。     

燃煤锅炉烟尘处理应用技术论述

论述了几种工业方法处理燃煤锅炉烟尘的净化技术,总结了企业湿法净化技术应用经验,认为采用文丘里除尘器和旋风水膜除尘器线合的技术,取得了较好的效果,实际运行效果监测数据符合GB13271－91（表2）二级标准,采用此法,企业在经济上可以承受,并取得好的环境效益和社会效益。     

气控气球式高压粉料连续加料技术

本工作研制厂一种气控气球式高压粉料连续加料器．其工作原理是利用输料管中高压气球的放气与充气来代替机械阀门的开与关．输料管中等距离放置一连串气球，用定时计控制的电磁阀-高压气路，使奇数位及偶数位两组气球交替发生充气和放气，从而使粒状物料从气球上逐级下落，从常压容器连续不断输入高压容器或从高压容器连续不断输入低压容器。此种加料装置与以往的螺旋杆加料器及星形轮旋转加料器相比，具有操作简单，可连续加料，对粉料无磨损，密封性与耐压性强等优点