聚氯乙烯生产中旋风干燥装置的提能降耗

介绍了聚氯乙烯生产中旋风干燥系统的工艺流程,分析了造成干燥系统处理能力不足的原因,并制定了解决措施,包括对引风机、风管、干燥床的改造,并增加了空气预热器。改造后,旋风干燥装置的生产能力得到了有效提升,蒸汽消耗降低,满足了生产系统的要求。     

聚合干燥除尘洗涤塔运行改造总结

电石法PVC装置聚合干燥工段一般采用旋风干燥技术。针对目前旋风干燥技术存在的尾气排放夹带粉料的问题,提出了改造方案,以促进旋风干燥装置的绿色发展。     

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.     

复式干燥装置

颗粒以流通的流化床作初步干燥再以旋风分离室作精干燥的复式干燥装置(以下简称旋风型干燥器),经实验室模型的试验表明,没有喷动床干燥器和流化床干燥器所有的缺点。物料在流通的流化床设备中初步干燥和普通的流化状态不同:在干燥器的下部主要是流化状态,而上部为气流输送状态。产品的精干燥在旋风干燥室中进行。旋风干燥室是一个气相悬浮系自切向引入的锥形干燥器。另外还有一条管道系统(图上设备1～4)接至旋风干燥室,供给补充气流。与喷动床的不同点在于旋风干燥室的各段上空气速度远大于颗粒旋扬速度。旋风干燥室的锥度是干燥过程强化的     

过程优化控制技术在SPVC干燥过程中的应用

阐述了采用"悬浮干燥过程优化控制技术"改造SPVC干燥装置的情况。运行数据表明,该技术提高了旋风干燥塔塔温控制精度、悬浮树脂成品的优级品率及挥发物指标。     

一种基于对乙酰氨基酚的气流干燥系统的回收装置

正本实用新型公开了一种基于对乙酰氨基酚的气流干燥系统的回收装置,属于气体干燥领域。所述对乙酰氨基酚的气流干燥系统包括:粉碎机、旋风分离器、第一集尘器和第一引风机;所述回收装置配置在所述第一旋风分离器的下方,通过管道分别与所述第一旋风分离器的第一出口和所述粉碎机的出料口连接,用于在对对乙酰氨基酚成品进行包装的过程中,回收漂浮的对乙酰氨基酚粉尘。本实用新型通过增加回收装置,在旋风分离器的出料口进行包装的过程中,对漂浮的对乙酰氨基酚粉尘进行回收,改善     

空气加热器内漏的原因及解决办法

齐化集团有限公司聚氯乙烯分厂是采用电石法生产悬浮聚氯乙烯树脂的厂家,装置生产能力为8万t／a,分为3万t／a和5万t／a两套装置,两套装置的干燥工段采用的都是旋风式干燥床。干燥床热风的风源是由两套箱式U型管带翅片的空气加热器提供的。系统风源提供冷空气,通过与加热器U型管内的过热蒸汽强制对流,完成热交换,被加热的空气提供给旋风干燥床。这种加热器散热面积大,完成的热交换效率高,而且通过对蒸汽流量的调解,     

常熟市南方机械厂隆重推出

<正>l.低压大风量分子筛空气除湿装置:本厂于93年国内首创的第一台低压大风量分子筛除湿装置,投入涤纶干燥系统运行至今承蒙广大用户的厚爱和支持,95年又推出了超大风量分子筛除湿装置.该装置适合于各种形式的聚酯切片连续干燥系统的除湿改造,单台最大风量可超过4000m~3/h以上,可同时供给多台干燥塔,总装机容量在50kw以下,不需冷冻机,不需压缩空气,干燥空气露点在一50℃以下,安全可靠,本厂负责现场改造设计、安装、调试,直至第一(?)开车,改造后一个生产年的节能费足可收回全部费用且提高产品的等品率、制成率.     

常熟市南方机械厂隆重推出

<正>1.低压大风量分子筛空气除湿装置:本厂于93年国内首创的第一台低压大风量分子筛除湿装置,投入涤纶干燥系统运行至今承蒙广大用户的厚爱和支持,95年又推出了超大风量分子筛除湿装置.该装置适合于各种形式的聚酯切片连续干燥系统的除湿改造,单台最大风量可超过4000~3/h以上,可同时供给多台干燥塔,总装机容量在50kW以下,不需冷冻机,不需压缩空气,干燥空气露点在—50℃以下,安全可靠,本厂负责现场改造设计、安装、调试,直至第一次开车,改造后一个生产年的节能足可收回全部费用且提高产品的等品率、制成率.     

可编程控制器在空气干燥器中的应用

结合赤天化股份公司仪表空气干燥装置控制系统改造,介绍了PLC在仪表空气干燥器程序控制系统改造中的应用,介绍了PLC选型,PLC程序设计.     

涤纶干燥设备的节能改造及效果

为了节约能源和降低生产成本,对干燥系统作了改造:在每套干燥系统中各加了1台列管式换热器及1台旋风分离器,利用其余热给工艺用压缩空气加热。经过改造后,不仅每套设备的实际能耗可以降低4.3 k W,5套结晶干燥设备每年共节约电量172 000 k W·h,而且可减少流程中废气对环境造成的热污染。     

悬浮法PVC大型负压旋风气流干燥系统的设计与应用

介绍了负压旋风气流干燥工艺流程和基本原理,给出了24万t／aPVC负压旋风气流干燥系统的详细设计计算过程,并简要介绍了该系统的应用情况。     

PVC手套专用糊树脂的研制与产业化

介绍了PVC手套专用糊树脂的研制过程,分析了其生产过程中存在的问题。通过提高单体质量,并对聚合、干燥、粉碎、包装等工序进行改造,提高了PVC手套专用糊树脂的质量,满足了加工用户的需求,实现了产业化、规模化生产。     

旋风快速分散干燥及热风回用技术在裂化催化剂气流干燥中的应用

介绍了一种应用于裂化催化剂气流干燥中的旋风快速分散干燥及热风回用技术,该技术结合了旋转闪蒸干燥技术和直管气流干燥技术的特点,具有体积传热系数大、热效率高、热风用量少和设备故障率低等优点。外排热风采用多管分配回用于热风炉内,大幅度提高了能源利用效率,每吨产品能耗降低30%。工业应用表明,该技术是先进、可靠的成套气流干燥技术。     

Comparison of Drying Kinetics of Paddy Using a Pneumatic Conveying Dryer with and without a Cyclone

The objective of the present work is to find the possibility of reducing the high initial moisture content of wet paddy using a small-scale, low-cost pneumatic conveying dryer that can be provided for each farming household. The dryer without a cyclone equipped at the exit of the dryer is studied and the data obtained from this system is compared with those obtained previously from the dryer with a cyclone. Parametric effects of the following variables are examined: velocity of drying air from 20 to 30 m/s, feed rate of rough rice from 150 to 350 kg/h, and drying air temperature from 35 to 70°C. From the experimental results it is found that the drying process with and without a cyclone are able to lead to very rapid drying without any grain quality problems such as cracks in the rice kernel. For the same experimental conditions, the cyclone-equipped dryer gives around 1% higher decrease of moisture content, 2°C higher average surface temperature of paddy, 3-4% higher average percentage of head rice yield, and 2 kg/h higher average evaporation rate. However, the energy consumption per evaporated mass of water is 20-30% lower than the non-cyclone-equipped dryer.     

Comparison of Drying Kinetics of Paddy Using a Pneumatic Conveying Dryer with and without a Cyclone

The objective of the present work is to find the possibility of reducing the high initial moisture content of wet paddy using a small-scale, low-cost pneumatic conveying dryer that can be provided for each farming household. The dryer without a cyclone equipped at the exit of the dryer is studied and the data obtained from this system is compared with those obtained previously from the dryer with a cyclone. Parametric effects of the following variables are examined: velocity of drying air from 20 to 30 m/s, feed rate of rough rice from 150 to 350 kg/h, and drying air temperature from 35 to 70°C. From the experimental results it is found that the drying process with and without a cyclone are able to lead to very rapid drying without any grain quality problems such as cracks in the rice kernel. For the same experimental conditions, the cyclone-equipped dryer gives around 1% higher decrease of moisture content, 2°C higher average surface temperature of paddy, 3–4% higher average percentage of head rice yield, and 2 kg/h higher average evaporation rate. However, the energy consumption per evaporated mass of water is 20–30% lower than the non-cyclone-equipped dryer.     

10万t／aPVC旋流干燥工艺的改进

介绍了某公司对PVC干燥工艺进行改进的具体措施：更换1#风机叶轮,在1#螺旋输送段加装螺旋输送叶片并调整螺距,拆去1#风机进口空气过滤器,断开20旋风分离器排风管与气流床的连接,改变罗茨风机主动轮、辅动轮直径,在C102抽吸风机排风口加装1组旋风分离器。改造后共减少经济损失约140万元／a。     

聚氯乙烯树脂高效组合式干燥工艺数值模拟及工程放大

聚氯乙烯树脂生产装置的具体特点,依据聚氯乙烯树脂的干燥动力学数据,数值模拟了聚氯乙烯高昴组合式旋流干燥装置,经与２．５万ｔ／ａ生产装置对比后发现：数值模拟结果与工厂实测数值基本吻合,说明所建立的数学模型可以较地模拟聚氯乙烯高效组合式旋流干燥装置,同时,以此为基础,设计开发了５万ｔ／ａ生产装置。     

Spray Drying of Tomato Pulp: Effect of Feed Concentration

The effect of feed concentration on spray drying of tomato pulp preconcentrated to 78, 82, and 86% wet basis is investigated in two spray drying systems: a pilot scale spray dryer (Buchi, B-191) with cocurrent regime and a two-fluid nozzle atomizer, and the same connected with an absorption air dryer (Ultrapac 2000). Data for the residue on the chamber and cyclone walls were gathered and two types of efficiencies were calculated as an indication of the spray dryer performance. Tomato powders were analyzed for moisture, particle size, and bulk density. In both spray drying systems, with increases in tomato pulp concentration overall thermal efficiency, evaporative efficiency, material loss in the cyclone, powder moisture content, and bulk density decreased, whereas powder particle size increased. On the contrary, the effect of feed solids content on residue formation and product recovery was dependent on the drying medium. In the standard dryer, the higher the feed concentration, the higher was the residue accumulation, and the lower the product recovery, whereas in the modified system increases in pulp concentration resulted in lower residue formations and higher product yields.