热成像技术在乙醛生产设备热故障识别中的应用

通过红外热像的测试，结合设备结构特点．对已醛装置中的再生器、反应器、除沫器村里的脱落、裂纹及减薄等故障的热特性进行了分析与识别，获得的热像特性可供同类设备参考。     

转子热弯曲的分析与诊断

提出了判定转子热弯曲故障的基于全息谱分析和时频分析的方法，并在石家庄炼油厂烟气轮机转子发生的热弯曲故障的诊断中得到了验证。故障排除后，转子振动得到控制并实现了机组的正常工作。     

热料埋刮板输送机故障分析与改造

分析了热料埋刮板输送机主要故障及发生故障的原因，介绍了改造的内容，取得了较好的效果。     

高可靠性集中热备份UPS供电系统

为解决现代化工装置中DCS系统供电的可靠性问题 ,提出了一种可靠性非常高的集中热备份UPS(Un interruptiblePowerSystem)供电系统方案 ,它解决了UPS单机运行时自身故障造成的停电问题和并机运行时输出电源质量下降的问题。它由n台常用UPS和 1台集中备用UPS0 组成 ,当常用UPS中有 1台发生故障或有几台同时发生故障时 ,自动不间断地切换到集中备用UPS0 上 ,由UPS0 对负载供电。在UPS品牌、负载功率、负载性质和使用环境相同的条件下 ,集中热备份UPS供电系统与常见的双机并联冗余UPS供电系统相比较 ,它具有高可靠性、高质量的输出电源、良好的故障隔离功能和优良的抗超载抗短路能力等特点 ,是DCS系统实用的理想的供电系统 ,是大型石化企业首选的供电方案     

热介质锅炉故障检修和保养方法研究

介绍了热介质锅炉的作用和工作原理。为了提高其稳定性和安全性,首先分析了热介质锅炉的主要故障类型及产生原因;再次,提出了利用专家系统进行故障自动检修的方法;第三,详细研究了热介质锅炉部件保养机制,为企业切实提高热介质锅炉的稳定性和安全性提供了一个切实可行的方法和建议。     

一起液硫管线伴热故障的分析与处理

介绍了液硫管线集肤伴热相关原理,针对现场出现的伴热电缆故障现象,分析了故障产生的根本原因,提出了液硫管线集肤伴热运行维护的注意事项,从根本上解决困扰集肤伴热安全稳定运行的问题。     

新型薄管板转化废热锅炉的应用

分析了新疆泽普石化厂二段炉后转化废热锅炉频繁出现故障的原因,并对替换的新型薄管板的结构性能和应用情况作了介绍,该废锅至今已平稳运行了3年。     

用电子继电器代替热继电器对电动机进行保护

三相异步电动机在水泥行业有很广泛应用，加强电动机管理，降低电动机烧毁率，对降低生产成本，确保设备高效运转起着一定作用。过去，一般采用热继电器对电动机进行保护，随着电子技术发展，电动机保护的电器元件不断更新换代，且性能稳定、可靠，灵敏度高。１电动机常见故障电动机除了转子及外围设备故障，主要是定子绕组故障。引起定子绕组故障有内部和外部２种原因，内部原因表现为断路、匝间短路和接地３种，断路常发生在端部、元件接头处或引出线附近；外部原因有接触故障、电动机引出线及外部接线脱落引起的断相，还有设备物料涌堵、…     

废热锅炉爆管故障的处理

废热锅炉爆管故障的处理王本照（青岛东方化工集团技术处２６６６０１）青岛东方化工集团公司硫酸厂于１９９３年７月份安装了一台型号为ＦＲ－４Ｔ－５／３２－２３８中压废热锅炉生产饱和蒸汽。同年８月份投入运行后，不仅满足了公司３０ｋｔ／ａ磷酸二铵装置生产用汽，...     

电气设备热故障分析及红外线技术的应用

红外诊断技术对电气设备的早期故障缺陷及绝缘性能做出可靠的预测,使传统电气设备的预防性试验维修提高到预知状态检修,这也是现代电力企业发展的方向。     

氮化铝的室温热导率

本文导出了氮化铝室温热导率的一般表达式，对提高氮化铝陶瓷材料室温热导率的途径作了讨论。     

热梯度法化学气相渗温度控制

建立了热梯度法化学气相渗工艺（ＣＶＩ） 模型，计算了圆筒炭毡内的温度分布，给出热梯度法ＣＶＩ 工艺沉积温度的控制方法。利用这种方法，采用热梯度法ＣＶＩ 工艺，在１００ ｈ 之内成功地制备出内径１６０ ｍ ｍ 、高３９０ ｍ ｍ 、厚２０ｍ ｍ 的圆筒炭毡增强Ｃ／Ｃ 复合材料，密度达到１ ．６ ｇ／ｃｍ ３ 。     

INTERACTION OF THERMAL RADIATION IN THE LAMINAR PIPE FLOW OF OPTICALLY THIN GASES

The influence of thermal radiation on laminar forced convection of a gray gas in a pipe flow is studied semi-analytically. The gas is considered as an absorbing-emitting medium and the thin gas model approximation is used to describe the radiative heat flux in the energy equation. Invoking the method of lines (MOL), the nonlinear boundary value problem is reduced to an initial value problem which is eventually solved by a standard Runge-Kutta integration scheme. Numerical results are presented graphically for a selected group of thermal parameters encompassing the thin gas behavior. Additionally, it is found that limiting cases namely: laminar plug flow and laminar parabolic flow, both in the absence of radiation define an envelope for the curves of bulk temperature and total Nusselt number describing the combined thermal process for a thin gas in laminar motion. In general, the comparisons reveal that these asymptotic solutions are valid when the entrance-to-wall temperature ratio is less than 2.     

THE OPTIMUM PLATE-SPACING FOR THE BEST PERFORMANCE IN FLAT-PLATE THERMAL DIFFUSION COLUMNS OF THE FRAZIER SCHEME

The effect of plate spacing on the degree of separation and production rate in flat-plate thermal diffusion columns of the Frazier scheme with fixed operating expense, has been investigated. The equations for estimating optimum plate-spacing for maximum separation and for maximum production rate have been developed. Considerable improvement in performance is obtainable when the thermal diffusion columns with optimum plate-spacing are employed for operation.     

高炉炭砖的导热系数及其影响因素

对微孔、半石墨质和普通等级炭砖试样的导热系数与温度的关系做了回归分析,得到了导热系数和温度的关系表达式,由此,可以从室温导热系数预测高温导热系数。另外,还计算了导热系数与体积密度、显气孔率、透气度和原料等级之间的相关系数。结果表明,导热系数与透气度和原料等级有一定的相关关系,而与体积密度和显气孔率无关。     

PREDICTION OF THERMAL CONDUCTIVITY AND VISCOSITY FOR SOME FLUIDS IN THE NEAR-CRITICAL REGION

The objective of this work was to develop general, simple and accurate expressions to predict the peculiar behavior of thermal conductivity and viscosity in the near-critical region. Expressions were determined for (a) variation of thermal conductivity as a function of temperature and density or pressure for carbon dioxide, water, and ammonia, and for (b) variation of viscosity as a function of temperature and density or pressure for carbon dioxide, water, and nitrogen. The predicted results based on the developed expressions showed a very good agreement with the available thermal conductivity experimental data and an excellent agreement with the available viscosity experimental data     

浸银碳石墨材料的热物理及力学性能

讨论分析了浸银碳石墨阀座和衬套材料的热物理及力学性能同热震因子的关系。重点叙述不同温度下热处理的碳石墨基体及浸银后的强度、导热、膨胀性能的测量结果，并对几种浸银碳石墨材料的抗热震因子进行了估算。     

THERMAL DEHYDRATION OF THE SODIUM CARBONATE HYDRATES

A thermal gravimetric method was employed to explore the course of dehydration of Na₂CO₃ · 10 H₂O, and Na₃CO₃ · H₂O particles. Experimental data were amassed both in the temperature-increasing and constant temperature mode. Very small sample masses were used in an effort to eliminate an effect of heat and mass transfer processes on the rate of reaction. Kinetic equations of Arrhenius type were proposed for two stages of the dehydration and tested against the results collected by experiment.     

THERMAL RADIATION EFFECTS ON THE COMBUSTION BEHAVIOR OF POROUS CHAR PARTICLES

The effects of thermal radiation on the pseudosteady state and transient behavior of porous char particles exposed to an oxygen containing environment are investigated. The numerical simulation results show that particles that do not interchange radiant energy with their environment are characterized by wider ambient temperature regions where multiple steady states exist, higher combustion rates, and lower burning times