30000m~3/h空分设备冷箱内泄漏的扒砂检修

30000 m~3/h空分设备冷箱内管线泄漏,导致冷箱壁结霜和冷箱基础温度下降。简介冷箱壁结霜现象和维持空分设备运行的监护措施。详细介绍扒砂检修的方案和具体情况,阐述检修过程中的质量控制措施和检修效果。     

KDON-4000/1800型空分设备低温液体泄漏检修分析

KDON-4000/1800型空分设备冷箱内低温液体泄漏,冷箱基础温度降低,下端结冰严重,冷箱板焊缝出现裂纹。当生产允许空分设备停车时,对冷箱系统进行了查漏检修处理。详细叙述冷箱系统加温、扒砂、以及查漏、管架修复、搭架和阀门垫片更换等检修工作;分析低压系统和中压系统的保压情况以及检修效果。     

一起大型空分设备冷箱内泄漏事故的分析及处理

介绍48000 m3/h空分设备冷箱基础温度降低的现象,分析冷箱内部的泄漏点位置和泄漏原因。对冷箱进行扒砂处理后,整改冷箱内的仪表管和支架,空分设备恢复正常运行。     

煤化工配套空分设备安全技术的研究(三)——大型特大型空分设备扒砂安全及高标准设计制作空分冷箱

4大型特大型空分设备扒砂安全及高标准设计制作空分冷箱4.1大型特大型空分设备扒砂安全4.1.1"砂爆"与"喷砂"事故频繁,损失惊人由于生产检修需要,空分冷箱扒除珠光砂时,打开人孔放砂,大量空气涌入冷箱,与冷箱内因设备、管道泄漏或气体凝结形成的低温液体进行剧烈的热交换,加上珠光砂的流动、摩擦、撞击,低温液体迅速汽化,体积数百倍增长(液氧800倍、液氮643倍、液氩780倍、液空约680倍),造成     

局部扒砂在28000 m~3/h空分设备冷箱内漏处理的应用

28000 m~3/h空分设备发生冷箱内漏故障,根据泄漏现象推断出漏点位置,采用局部扒砂方案,克服珠光砂大面积结冰困难,顺利找到漏点并处理。介绍局部扒砂的方案和安全措施,阐述扒砂操作和漏点处理过程,最后分析珠光砂结冰的原因,并提出为防止珠光砂结冰应采取的预防措施。     

空分设备冷箱扒砂操作的探讨

简介了空分设备冷箱扒砂所需的主要用具及其作用和扒砂人员的防护措施,分析了扒砂前的操作及需达到的工艺要求,重点介绍了冷箱扒砂过程中的操作要点和安全事项。     

砂爆事故的原因及预防

分析了空分设备冷箱排放珠光砂时发生砂爆事故的原因,简介了扒砂前的准备工作,详细介绍了扒砂过程中应注意的事项以及空分设备在设计时为防止砂爆事故的发生应采取的预防措施。     

空分设备冷箱鼓胀变形的发生和预防

空分设备冷箱漏液,必须扒砂。介绍了扒砂过程中发生的冷箱鼓胀变形事故,分析了事故的原因和今后的防范措施,提出了安全扒砂的建议。     

空分设备筛板塔内珠光砂的清理

空分设备冷箱内管道断裂,珠光砂会进入塔体或板翅式换热器内部,影响空分设备的正常运行。详细介绍珠光砂进入筛板塔的清理方法和步骤,阐述鼓风机自动吸砂和吸尘器人工吸砂相结合的清砂方案的效果,提出空分设备冷箱日常安全管理的措施。     

20000m~3/h空分设备裸冷优化操作及效果

由于20000 m3/h空分设备运行过程中仪表管断裂,低温液体泄漏,使冷箱钢板冻裂。对空分设备冷箱内的管道、塔器和阀门进行了检修、改造,之后通过裸冷来检查检修、改造的效果。详细叙述20000 m3/h空分设备裸冷前的准备工作和裸冷优化操作方法,阐述裸冷效果与裸冷后期查漏、设备变形情况及相应处理措施。     

Utilization of LNG cold

This paper will discuss the utilization of LNG cold in Japan. Discussion is concentrated on the following: temperature conditions of both direct and indirect utilization; restriction in quantity and mode of cryogenic energy utilization; distance from LNG terminals to cold utilization plants; cooling system for LNG cold utilization plants, and emergence of cryogenic energy utilization complexes.     

Simulation of cold rolling

Abstract

An interactive graphic simulator of the cold rolling process has been developed. The rolling pressure model is based upon the Bland–Ford theory and includes the elastic deformations of strip and work rolls. The transverse elastic deformation of the four-high roll system is modelled by a polynomial parametrization of the results from a finite element analysis. Coolant control of the thermal expansion of the work rolls is also included. The main use of the simulator is for operator training, and it will also create a more uniform understanding of the cold rolling process among rolling mill production staff.

MST/369     

空调冷水管道失冷量分析图

推导冷水管道输送冷水时冷量损失计算模型,指出失冷主要由管壁传热产生,且与流量关系不大。绘制只根据水温和管道特性便能估算冷量损失的失冷图。     

冷库液体冷媒融霜的性能实验研究

介绍了冷库液体冷媒融霜实验装置,对实验结果进行分析研究.与热气融霜相比较,液体冷媒融霜系统具有制冷量大,对换热器翅片效率影响小,室温波动小等优点,是一种可行的融霜方法.     

空分设备长时间冷备用和冷启动操作总结

20000 m3/h空分设备长时间冷备用后再启动时,由于主换热器空气通道中存有固体二氧化碳,导致冷启动失败。后改变冷启动操作方案,成功启动空分设备。介绍空分设备长时间冷备用成功与否的决定因素,详细分析冷启动过程及遇到的问题,阐述第一次冷启动不成功的原因以及从中得到的冷启动操作经验。     

Performance of the cold transport system utilizing evaporation-freezing phenomena with a cold trap

This paper dealt with the performance of a novel cold transport system for the waste cold from the gasification process of Liquefied Natural Gas (LNG), which has been proposed by one of the authors. The system consists of an evaporator, a cold trap, and a pipeline between them, and the LNG cold poured into the cold trap is transported to the evaporator as a flow of low-pressure water vapor. In this study, cold transport rate of a small-scale system was experimentally examined under various conditions, and the efficiency of cold transport was discussed. The results clearly showed that, as suggested by a theoretical relation based on the pressure drop due to vapor flow in the pipeline, cold transport rate is affected both by the pressure difference between the evaporator and cold trap, and by the length, diameter and friction factor of the pipeline. However it was also shown that the transport rate is hardly influenced by the temperature of pipeline wall. Based on the theoretical relation and the experimental results obtained herein, a guideline for designing the cold transport system was derived.     

食品冷链的发展方向

食品冷链的发展直接关系到人们的生活健康,本文通过分析我国食品冷链中存在的主要问题,提出了一些建议及措施,展望了我国食品冷链的未来.