电磁平衡式玻璃液面调节系统

本文介绍了一种适于中小型玻璃厂使用的电磁平衡式玻璃液面调节系统,控制精度可达0.1～0.5mm.介绍了系统的机械原理及电路设计.     

关于除尘平衡风压装置的改造

一种除尘平衡风压装置,包括风机,风机一侧连接有与其风机口规格尺寸相适配的烟囱,烟囱通过出口连接管道连接有布袋除尘器,布袋除尘器相对于出口连接管道一侧通过连接管道连接有阻火箱冷却器,阻火箱冷却器一端通过管道及弯头结构连接焦炉设备的除尘干管。本发明与现有技术相比的优点在于：通过在风机管道口特设置一个余压阀,吸力超过定值时,余压阀自动打开补入空气进行调压以确保管路安全运行,装置整体关闭紧密,反应灵敏,调节方便且外表美观,较传统烟尘处理设备而言不耗能源,其吸入空气量不影响除尘效果。     

甲醇装置合成气压缩机平衡管改造浅析

／t绍了江苏索普集团54万t／a甲醇装置合成气压缩机平衡毂设计存在的缺陷以及平衡毂缺陷对生产的影响,通过对平衡管的改造及干气密封的调整,消除了存在的缺陷,实现了合成气压缩机连续稳定的运行。     

刮板式捞渣机的改造

通过刮板形式的改造,使刮板式捞渣机的捞渣能力成倍增加,从而解决捞渣机能力不足的问题。     

硫铁矿渣输送设备的改造

因扩产及硫铁矿含硫量降低,致使矿渣输送设备超负荷运行,经常发生故障。介绍采取矿渣和矿灰分流（矿渣由冷却滚筒输送、矿灰由埋刮板输送机输送）;加大冷却滚筒直径、改进叶片、加大冷却面积;重新设计选用 Ｍ Ｓ Ｒ４０ 型热料埋刮板输送机（ｂ＝ ４００ ｍ ｍ 、ｈ＝ ４００ ｍ ｍ ,输送能力７０～８６ ｔ／ｈ）。改造效果良好     

聚酯装置中刮板冷凝器的改造

简单介绍聚酯生产线的真空系统中刮板冷凝器的改造过程。在大刮板后面焊接一条加强筋 ,把小刮板由钢管改成弹簧钢板 ,在物料排出口处增加一个旁通 ,效果非常明显。     

TDF120-250×9型渣油泵平衡盘改造

分析了TDF120-250×9型渣油泵平衡盘频繁失效的原因,提出了一种新型的动力楔平衡盘结构,试用情况表明.该新型平衡盘可有效避免平衡盘与平衡盘座贴合而造成的严重磨损,平衡盘使用寿命显著延长;同时又具有逆流泵送作用,减小了泄漏量,节约了能源。     

电石渣回转滤饼喂料机刮板的改造

<正>我公司一线3000t/d生产线采用100%电石渣配料,于2010年9月投入生产,使用化工厂湿法生产乙炔产生的电石渣作为石灰质原料。湿电石渣分两路分别通过两台回转滤饼喂料机进入两台烘干锤式破碎机。在生产中,回转滤饼喂料机出现电流高和卡死等问题,我们为此进行了改造。1问题回转滤饼喂料机起到锁风和稳定下料的目的。其内部有平行的两根转轴,相互做同步运动,一根轴上有刮板,另一根轴上安装有旋转叶片,旋转叶片起锁     

刮扳式捞渣机改造总结

阐述了刮板式捞渣机在Shell煤气化装置运行中存在的铸石衬板脱落,驱动链卡链、跳链、断链,2套圆环链因受力不均而出现刮板与壳体刮、卡、碰现象,箱体变形等问题,并对出现的问题进行详细分析探讨.提出了相应的整改措施,即改进衬板结构、改单侧驱动为双侧驱动、加固箱体等,提高了捞渣机运行稳定性,延长了运行周期.     

关于熔窑液流形态平衡的探讨

提出了熔窑液流形态平衡的问题,对影响平衡的主要因素作了一定的探讨,并就生产当中如何更好的把握该项内容提出了一些建议.     

EFFECTS OF AERATED LIQUID LEVEL ABOVE DOWNCOMER ON HYDRODYNAMIC CHARACTERISTICS OF AN EXTERNAL-LOOP AIRLIFT REACTOR

Effects of the aerated liquid level above the downcomer on riser superficial liquid velocity, gas flow rates, and gas holdups in individual sections were investigated in an external-loop airlift reactor. The aerated liquid level is an important operating parameter, and the valve connected to the extension tube could adjust it. As the aerated liquid level was increased up to 0.158 m, which was slightly larger than the diameter of the riser, both the liquid circulation velocity and the gas flow rate in the extension tube increased, whereas the riser gas holdup, the downcomer gas holdup, and the gas flow rate in other individual sections except the extension tube decreased. A combination of the gas-liquid separation ability and hydraulic resistance of the head region and the surface aeration could explain the impact of the aerated liquid level on the hydrodynamic characteristics. However, the effect was negligible when the aerated liquid level was higher than 0.158 m.     

EFFECTS OF AERATED LIQUID LEVEL ABOVE DOWNCOMER ON HYDRODYNAMIC CHARACTERISTICS OF AN EXTERNAL-LOOP AIRLIFT REACTOR

Effects of the aerated liquid level above the downcomer on riser superficial liquid velocity, gas flow rates, and gas holdups in individual sections were investigated in an external-loop airlift reactor. The aerated liquid level is an important operating parameter, and the valve connected to the extension tube could adjust it. As the aerated liquid level was increased up to 0.158 m, which was slightly larger than the diameter of the riser, both the liquid circulation velocity and the gas flow rate in the extension tube increased, whereas the riser gas holdup, the downcomer gas holdup, and the gas flow rate in other individual sections except the extension tube decreased. A combination of the gas-liquid separation ability and hydraulic resistance of the head region and the surface aeration could explain the impact of the aerated liquid level on the hydrodynamic characteristics. However, the effect was negligible when the aerated liquid level was higher than 0.158 m.     

开车过程中压吸收塔的液位控制

在Snam氨汽提法尿素生产工艺中,中压吸收塔液位控制的好坏直接影响开车的成败.通过分析中压吸收塔的工作原理,以及如何通过各点温度的变化来判断其液位的高低,总结在装置开车过程中稳定控制中压吸收塔液位的措施.     

CONVECTIVE HEAT TRANSFER CHARACTERISTICS OF GAS IMPINGEMENT ON SMALL HEATED DEVICE IN LIQUID COOLANT BATH

Heat transfer characteristics of a small heated device have been investigated in a liquid bath with gas jetimpingement as function of gas flow rate,coolant temperature,liquid phsicochemical properties,heat flux,heat source size,ambient pressure and the distance between jet and heated wall.The experimental results show that the agitation of liquid caused by gas jet bubbles increases greatly therate of heat transfer,and the evaporation of coolant near the wall,which was due to the concentration differencebetween gas-liquid interface and bulk gas phase,gives additional enhancement of heat transfer.The rate ofevaporation related to the bubble growth was mathematically formulated.By using the simultaneous heat and mass transfer model,the convective heat transfer coefficient and masstransfer coefficient can be deduced from the experimental results.In addition,the local heat transfer coefficient and the distribution of evaporation heat flux on the smallheated surface are investigated mathematically and experimentally.     

尿素合成塔液位调节蝶阀的技术改造

将尿素合成塔液位调节蝶阀成功的改造为三偏心蝶阀,介绍三偏心蝶阀的结构特征、流量特性以及材料选择要求.     

液位控制对聚丙烯装置长周期运行的影响

通过对聚丙烯装置近5年停车情况进行的分析，找出了聚丙烯装置停车的主要原因，通过对液相反应器液位测量方式的讨论，指出了现行液位测量与控制上的缺点及偏差；试图从液相反应釜搅拌电流来估算合适的液位区间，即最佳液位。并提出了改进液位测量与控制的技术措施和操作指导。     

二氧化碳汽提塔满液原因分析及解决对策

针对尿素装置实际运行过程中汽提塔液位出现异常显示的情况,通过雷达液位计、阀门、管线以及汽提效率分析满液情况,提出相应的处理办法,以确保系统的稳定运行。     

汽包液位补偿系统在DCS中的应用

介绍常见的汽包液位补偿系统及其补偿原理,并以单室平衡容器液位补偿为例,简述其在CS3000系统中的组态实现。     

液位控制系统中混沌运动的最优控制

分析了液位控制系统中的混沌运动,说明了基于局部线性化基础上的最优控制存在的问题,提出在反馈线性化基础上对液位控制系统中的混沌运动进行最优控制.仿真实验表明了该方法的有效性和可行性.