炉温测定过程中问题产生的原因及解决方法

描述了某新建工厂涂装车间烘干炉炉温测定过程中遇到的若干问题及问题的解决。     

重卡车身新涂装线调试中的若干问题及其解决办法

论述了重卡车身新涂装线调试过程中遇到的问题:烘干室内车身各部位温度不均、电泳底漆缩孔、涂层异色及面漆产生针孔等.对问题产生的原因进行了排查,提出了切实有效的解决办法.     

涂装线取消密封胶烘干炉及其影响

为了降低国内现有汽车厂的能源消耗,本文介绍了涂装车间对于工艺流程的优化方案(取消密封胶烘干炉工艺),着重介绍了取消烘干炉后对工艺和设备的影响及能耗分析,详细介绍了烘炉取消后的一些问题及解决方案,对工厂节能减排提供方向,同时减少CO2的排放.     

关于涂装项目环评中烘干炉烟气执行标准的探讨

涂装项目环评中存在烘干炉烟气排放标准执行不一的现象。本文通过对此类项目环评文件编制中存在的问题进行分析,提出标准的选择应根据烘干炉的加热方式确定,并建立在对工艺流程和产污环节充分论述基础上,最后给出了相关标准修订的建议,从而为主管部门的决策提供有力支撑,也为我国环境标准体系的逐步完善提供技术支持。     

汽车涂装生产线工艺调试问题分析

调试是设计和设备安装工作的延续,完善的生产调试过程,将为汽车生产厂建厂后在较短时间内取得经济效益。汽车涂装生产线由于非标设备较多且复杂,工艺调试工作量大,及时和有效地分析解决此阶段出现的问题,无疑对汽车涂装项目的满负荷生产具有至关重要的意义。通过分析东安黑豹新厂区乘用车项目及其他总包涂装线工艺调试中的几个代表性问题,探讨涂装工艺调试中的原则和注意事项,为涂装生产线的总承包工作提供参考和借鉴。     

型煤立式烘干炉生产中存在的问题及改进

把湿型煤烘干成水分低的干型煤是型煤加工生产的关键,它通过烘干炉来实现.挤压机挤出的湿煤棒下到皮带,经皮带送到烘干炉顶,由卸料小车下到烘干炉,烘干后干煤棒从炉底出来,再经皮带送到造气煤仓.热风炉燃烧产生的热风,由引风机抽走经烟道管送到烘干炉内的烟道,作为烘干型煤的热源,和型煤直接接触烘干型煤.型煤在烘干炉里的烘干过程是一个动态流动的过程,其烘干质量受烘干热源的温度、进煤速度和流量、型煤的挤压质量、烘干振动出煤速度等影响,操作、控制不当,会出现型煤结块,甚至出现型煤在烘干炉内着火等情况,对型煤烘干生产影响较大.     

涂装生产线烘干炉的设计及施工管理

介绍了生产线建设过程中从设计阶段到安装调试阶段烘干炉部分的主要工作内容,包括烘干炉尺寸的设计、烘干炉的原理及各主要功能部件的组成、现场施工阶段的管理方法及注意事项等。     

PID测控技术在烘干炉上的应用

本文介绍一种实用的温度测控技术 ,它采用仪表PID调节和时间比例分组投入加热控制方案 ,解决了以往烘干炉温度控制存在的一系列问题。     

矿渣立磨调试中出现的问题及解决方法

<正>我公司2009年承建的成都亚鑫矿渣微粉有限公司年产30万t矿渣粉生产线,采用了天津水泥工业设计研究院TRMS3231立磨作为矿渣粉磨设备。在试生产初期,经常出现外排量过大致磨机跳停;进料管     

粉末涂装中出现的问题和产生的原因及解决措施

粉末涂装的产品质量一方面受粉末涂料质量的影响,另一方面受前处理方法、涂装设备、涂装工艺参数、涂装环境等因素的影响。分析了粉末涂料涂装中出现问题的原因并提出了相应的解决措施。     

50万t/a甲醇装置试开车过程中出现的问题及采取的措施

介绍了河南煤业化工集团中原大化公司50万t/a煤化工项目甲醇装置各单元的试车情况和甲醇装置运行情况,分析了在试开车和运行过程中出现的问题:一氧化碳变换系统超温、低温甲醇洗系统的循环气压缩机管线振动及甲醇循环泵损坏、甲醇合成系统升温速度慢等,并提出了相应的解决措施:减少第一变换炉催化剂的装填量并改变第二、三变换炉的新鲜气的分配、对循环气压缩机的配管进行修改、对甲醇合成系统进行升温回路改造。这些措施的实施,保证了生产运行的稳定。     

关于国内干燥设备的几个问题

从干燥设备的开发设计、使用、操作及适用范围４个方面论述了干燥设备中所存在的问题,旨在推动干燥行业能以理论来指导生产、使用和操作,并能提高设备的生产能力以及出现通用性强的干燥设备。     

Ultrasonic Convective Drying Kinetics of Clipfish During the Initial Drying Period

A hybrid drying system for high-intensity airborne ultrasound applied in convective drying was investigated for the drying of salted codfish (clipfish). Convective drying with ultrasonic assistance at 10, 20, and 30°C was compared to the same process without ultrasound. The Weibull model was used to model and investigate the drying behavior, and the effective diffusion in Fick's law was determined. The ultrasound decreased the drying time more at lower drying temperatures. The drying time was reduced by over 90% at a drying temperature of 10°C. For an industrial drying process at a temperature of 20°C, the drying time was reduced by 32.2%. The ultrasonic, convective drying of clipfish at a temperature of 20°C was faster than the same process without ultrasound at 30°C. The investigations showed a thermal effect for all products when ultrasound was applied. The specific moisture extraction ratio (SMER) in the investigated system was improved by 0.2 kg_water kWh^?1. The heat transfer coefficient in the system used was increased by 32.6% for a heating process in a separate investigation, whereas for a cooling process no increased heat transfer coefficient was determined. The thermal effect might (at least partially) explain the faster drying of ultrasonic-assisted convective drying. The results obtained demonstrate the potential of airborne ultrasound in convective drying with regard to drying time, energy consumption, and product quality. Documentation of the thermal effect should be included in future R&D on this topic.     

涂装涂层系统安调阶段的质量控制

重点论述了涂装涂层系统安装调试阶段的质量控制问题,并详细分析了安装调试过程中的质量控制点。     

日产34 t保温瓶胆玻璃全电熔窑的调试运行

通过对一座日产34 t保温瓶胆玻璃全电熔窑的介绍和前期调试中遇到的问题,表明玻璃电熔窑整体熔化效果良好,利用多边形全电熔窑熔化保温瓶胆玻璃是可行的,为保温瓶玻璃的全电熔窑技术应用提供借鉴。     

分解炉仿真技术在水泥生产调试中的初步研究

天津水泥工业设计研究院有限公司在总结工程实践经验的基础上,开发出了具有分解炉三维数值模拟功能的计算机辅助试验平台系统,天津院技术人员运用该系统指导华润水泥（平南）有限公司3号线的生产调试,对该厂分解炉温度场分布进行了很好的预测,为现场技术人员提供了新的调试手段。     

Surface Stickiness of Drops of Carbohydrate and Organic Acid Solutions During Convective Drying: Experiments and Modeling

Drying kinetics of low molecular weight sugars such as fructose, glucose, sucrose and organic acid such as citric acid and high molecular weight carbohydrate such as maltodextrin (DE 6) were determined experimentally using single drop drying experiments as well as predicted numerically by solving the mass and heat transfer equations. The predicted moisture and temperature histories agreed with the experimental ones within 6% average relative (absolute) error and average difference of ± 1°C, respectively. The stickiness histories of these drops were determined experimentally and predicted numerically based on the glass transition temperature (T_g) of surface layer. The model predicted the experimental observations with good accuracy. A nonsticky regime for these materials during spray drying is proposed by simulating a drop, initially 120 µm in diameter, in a spray drying environment.     

Surface Stickiness of Drops of Carbohydrate and Organic Acid Solutions During Convective Drying: Experiments and Modeling

Abstract

Drying kinetics of low molecular weight sugars such as fructose, glucose, sucrose and organic acid such as citric acid and high molecular weight carbohydrate such as maltodextrin (DE 6) were determined experimentally using single drop drying experiments as well as predicted numerically by solving the mass and heat transfer equations. The predicted moisture and temperature histories agreed with the experimental ones within 6% average relative (absolute) error and average difference of ± 1°C, respectively. The stickiness histories of these drops were determined experimentally and predicted numerically based on the glass transition temperature (T _g ) of surface layer. The model predicted the experimental observations with good accuracy. A nonsticky regime for these materials during spray drying is proposed by simulating a drop, initially 120 µm in diameter, in a spray drying environment.     

Effect of Diffusion on Component Segregation During Drying of Aqueous Solutions Containing Protein and Sugar

Water content profiles within thin aqueous films of lactose and bovine serum albumin (BSA) were tracked during drying using inverse microscope Raman spectroscopy (IMRS). These film drying experiments provide useful insights into component diffusion within droplets during spray drying in the food industry. Virtually no segregation of lactose and BSA occurred in the films during drying at 30°C. Thus, in film drying simulations at this temperature, lactose and BSA can be assumed to be a single homogenous solute, and binary diffusion of water and this single solute can be modeled. A solute-fixed coordinate system drying model properly predicted the water content profiles and shrinkage of the films during the constant rate period. This represents a partial validation of the model. The drying model predicted significant gradients in water content in films dried at a higher temperature of 80°C, which have the potential to drive segregation of lactose and BSA. However, IMRS analysis of films dried at 80°C revealed no segregation of lactose and BSA. We propose that lactose and BSA are relatively immobile in the bulk of the film during drying, forming a homogenous gel that allows the significantly smaller water molecules to diffuse through. The observed accumulation of BSA as a monolayer at the surface of the dried films appears to be a local phenomenon most likely driven by the surface activity of BSA.