PTA装置氧化回转蒸汽列管干燥机腐蚀失效分析

PTA装置氧化回转蒸汽管干燥机因腐蚀等原因造成加热管和筒体多次泄漏 ,通过对加热管进行取样分析 ,查找腐蚀失效机理 ,为检修提供了依据     

旋转列管式干燥机内干燥过程的计算机模拟

以颗粒热传递模型为基础 ,运用面向对象的程序设计思想 ,结合微软基础类库 (MFC) ,在Win dowsNT环境下 ,开发了初步的旋转列管式干燥机的计算机模拟软件。实例证明 ,该模拟软件是方便、有效和可靠的     

喷雾干燥塔节能降耗途径探索

喷雾干燥塔是陶瓷厂的耗能大户，作者总结多年来从事喷雾干燥研究及推广应用的经验，归纳出喷雾干燥节能降耗的有效途径，供各喷雾干燥塔用户借鉴。     

Energy Analysis of a New Design of a Photovoltaic Cell-Assisted Solar Dryer

In this study, a new type of solar dryer was designed and manufactured. This new solar dryer is composed of a heat pipe collector, a drying chamber, a load cell, an air circulation fan, photovoltaic cells (PvC), batteries, and halogen lamps. In this experimental study, tomatoes were used to test the drying process. The drying air was heated by the heat pipe collector and forced through the tomatoes by a blower fan during the daytime. The photovoltaic cells, which were used to run the fan, were also used to charge the batteries during the day. These charged batteries were used for running the halogen lamps during the night, when the halogen lamps were used to heat the drying-air-assisted photovoltaic cells. During the drying period, the drying air temperature, relative humidity, air flow rates, solar radiation, and loss of mass were measured in the solar dryer. Then, the measured data were used for energy analysis.     

埋管流化床干燥机在多聚甲醛干燥中的应用

对喷雾法生产多聚甲醛的普通流化床干燥工艺进行了改进。成功地将埋管流化床干燥机应用于多聚甲醛干燥工艺,其节能和增产效果十分显著。     

用颗粒热传递模型计算旋转列管干燥机的传热系数

采用基于移动加热板的颗粒热传递模型计算大型旋转列管干燥机的传热系数。在料床完全混合的简化假设下 ,按物料在干燥机内的实际干燥过程分段计算各段的传热系数及整机总传热系数 ,其结果与干燥机的实际运行情况基本相符。     

Investigation of Air Flow Distribution in Small-Scale Food Products Dryer

Experimental and numerical investigations showed that the air flow velocity distribution between the shelves with identical inlet cross sections is nonuniform; in the gaps between the shelves located in the bottom part of the dryer the velocity is rather high and in the gaps between the shelves located in the middle and at the top of the dryer the velocity is low. A nonuniform air flow distribution causes unequal drying of the product; therefore, the position of shelves with the products must be periodically changed; that is, operation of the dryer is not optimal. It was revealed during numerical investigations that the use of variable inlet cross sections between the shelves gives more uniform air flow distribution. Numerically obtained air flow velocity distribution results between the shelves with the use of variable inlet cross sections were also justified experimentally.     

水处理在锅炉节能降耗方面的应用

锅炉结垢不但使传热系数降低,还容易导致发生爆管事故,同时也会产生过量排污、浪费燃料和浪费水资源等一系列问题.加强水处理可以优化水质有利于锅炉的防垢、除垢及保障安全,不但能提高锅炉热效率,还可以降低锅炉排污率,节约水资源,改善工作环境.此外,采用优化燃料、冷凝水再生技术也有助于提高锅炉热效率.运用以上方法可达到节能降耗的最终目的.     

工业锅炉的能效测试

分析了我国工业锅炉的能效现状.通过对能效测试方法的分析,明确了影响能效测试结果的主要因素,并通过对影响因素的分析提出了提高锅炉热效率的方法.     

新型干燥机CAD系统的设计

本文介绍了一种新型干燥机ＣＡＤ系统的建立方法。并着重阐述了软件系统的构成及程序设计的基本方法。本系统用Ｃ语言完成干燥机的设计计算机模块；以Ａｕｔｏｌｉｓｐ语言编程，以Ａｕ－ｔｏＣＡＤ为平台，实现了干燥机的参数化绘图。     

PTA装置氧化干燥机更新改造

介绍了PTA氧化装置的关键设备——密闭型蒸汽管回转干燥机的结构特点,针对原装置存在的问题并结合厂家要求提出了合理的更新方案,试运转效果良好。     

甘肃省工业锅炉节能对策探讨

围绕影响工业锅炉能效的生产(含设计、制造、安装、改造、维修)、使用和检验环节,探讨甘肃省工业锅炉设备和管理方面存在的普遍问题,寻找节能的方向和目标。从政府政策引导、技术进步以及加强管理等方面研究相应的节能降耗对策。     

小型工业锅炉节能改造技术的实施

小型工业锅炉因其炉型、使用工况各有不同,运行管理水平参差不齐,能源综合利用又要求各种热力参数互相耦合,单独采用某项通用节能措施往往达不到能源高效综合利用的目的,因此小型工业锅炉的节能改造方案应根据其具体情况来量身定做。文章用框图法对小型工业锅炉系统普遍存在的问题进行归类,指出节能改造的方向和实施流程,并以某印染厂一台循环流化床锅炉为例,分析改造前锅炉存在的问题及原因,提出了节能综合改造方案。通过对改造前后锅炉各项参数的分析对比,该锅炉改造后的锅炉效率比改造前提高了15%,每年节省用煤成本约245万元,经济效益明显。     

催化剂氢氧化铝生产中盘式连续干燥器的研究和应用

本文分析了催化剂氢氧化铝生产中盘式连续干燥器的技术特性和应用情况,通过试验证实该干燥器具有热效率高、不污染环境等优点。     

循环流化床锅炉屏式过热器爆管原因分析及处理措施

屏式过热器在同一位置6次出现爆管事故,通过对爆管处现场观察及锅炉管取样金相分析,结合运行记录发现:该锅炉管发生高温蠕变,金属组织发生完全球化,超温导致锅炉管材性能减弱发生爆管.针对此原因,提出了相应的预防处理措施.     

重催锅炉水处理技术研究与应用

对辽河石化公司催化车间余热锅炉采用WPLT-C105剂(除氧钝化剂)进行给水pH值调节,用WPLT-H201剂(缓蚀阻垢剂)代替磷酸三钠进行炉内水处理的情况进行了介绍,表明锅炉给水、炉水、蒸汽指标合格率大幅提高,完全能够满足安全生产要求,节能减排效果也很显著。     

离心流化床干燥器的流体力学及传热性能

以９种颗粒物料为研究对象,找出了影响离心流态化干燥系统的流体力学及传热性能的主要因素,回归得到了流体力学及传热的无因次准数关联式,为进一步研究此设备的干燥性能打下了基础。     

Prediction of Residence Time Distribution of Solid Wastes in a Rotary Dryer

The residence time distribution (RTD) of heterogeneous citrus waste particles was determined in a semi-pilot-scale rotary dryer with concurrent flow under several operational conditions. The experimental methodology was based on the stimulus-response technique, which consisted of injecting pulse-like tracers in the dryer feed stream. Measurements of RTD were performed to build up experimental curves that were numerically integrated to provide the mean residence time. A perfectly-stirred-tank in series model and a neural network model were derived. In addition, empirical and semi-empirical correlations from the literature were used to estimate residence time and the influence of operating conditions on this variable was investigated.     

对流传热强化在水套炉中的应用分析

以无功传热强化技术为基础,简要回顾了换热管传热强化的研究进展,对管内对流传热强化的应用进行了介绍。基于水套炉中换热管束的结构特性和管内介质物性,提出水套炉的换热管传热强化技术的影响因素。最后对管外传热强化进行了讨论。     

Correlation of the Area-Mass Transfer Coefficient Inside the Drum of a Clothes Dryer

Abstract

The mass transfer process inside the drum of a clothes dryer affects its performance. The area-mass transfer coefficient was defined and correlated to the weight of the clothes, drum speed, the Reynolds number, Schmidt number, and Gukhman number using the experimental results of 32 runs on a Frigidaire clothes dryer. The coefficient of correlation was 0.994. A separate correlation for the Sherwood number was evaluated for a single piece of cloth stretched perpendicular to the flow in a pipe. This second correlation was used to compare the mass transfer inside the actual dryer with that of the “idealized” mass transfer process for a single piece of cloth. The results indicated that the average mass transfer efficiency for clothes in the dryer was only 26.4% of the ideal process. Means to enhance the area-mass transfer coefficient and the reasons for the poor performance of an actual dryer are discussed.