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脱硫塔是氨法脱硫中的核心设备,塔体设备高大且其内件结构层繁多,在设计中存在许多重点及难点。采用底板与基础型钢焊接并开设塞焊孔形式,保证设备与基础安装;喷淋层的布置及各支撑梁的合理设计是保证脱硫塔安全有效运行的前提。 相似文献
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高效空塔喷淋技术近年被广泛应用于工业锅炉烟气脱硫装置。本文总结了福建鑫泽环保设备工程有限公司开发的"XZKP型高效空塔喷淋烟气脱硫装置"的工业应用情况,并侧重对装置脱硫原理、设计要点、工艺流程、技术指标、运行效益等做了介绍,对相关设计单位及广大用户有一定借鉴作用。 相似文献
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以年产400万吨煤制油工程硫回收尾气处理项目为例,对两级Claus+焚烧+氨法脱硫工艺在脱硫效率和长周期稳定运行性能方面提出改造思路,同时基于改造后的氨法脱硫装置,针对入口尾气SO_2浓度、吸收喷淋量、氧化风量和循环液温度等参数对脱硫效率的影响规律进行实验探索,并总结得出运行优化建议。 相似文献
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喷淋洗涤条件下水汽饱和度分布特性 总被引:9,自引:2,他引:7
为在脱硫喷淋塔中借助蒸汽相变原理促进PM2.5凝结长大,需要在塔内建立适宜的过饱和水汽环境。基于此,建立喷淋洗涤条件下气液两相热质传递模型,系统研究了操作参数对塔内饱和度分布特性的影响规律。结果显示,通过降低喷淋液温度、增加塔进口烟气含湿量,以及在喷淋区上方添加蒸汽均能够在塔内建立过饱和水汽环境;采用较大的液气比、较小的喷淋液滴直径有利于水汽饱和度的提高。获得了改变操作参数在脱硫喷淋塔内建立过饱和水汽环境的措施,对实际的脱硫除尘工艺的设计和运行具有指导意义。 相似文献
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包晓晖 《中国石油和化工标准与质量》2019,(8):84-85
焦炉煤气制合成气的脱硫过程中,对脱硫效率要求不高,属于预脱硫阶段,考虑到脱硫塔堵塔问题,选择采用空塔喷淋脱硫塔,运行过程中不存在堵塔现象,且脱硫效率能达到设计要求。 相似文献
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随着原料煤硫含量不断上升,湿式氧化法脱硫装置出现了堵塔、格栅填料倒塌等现象。通过采用两级脱硫工艺对脱硫装置进行改造,基本解决了脱硫装置在运行过程中出现的问题。针对湿式氧化法脱硫工艺的特点,分析了脱硫装置在设计中应注意的问题,并从脱硫溶液的组分、循环量、温度、再生及回收方面提出了优化工艺管理的措施。 相似文献
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针对列管式空气预热器在使用中出现的一些事故和问题,提出设计改进建议,以在充分发挥材料潜能的基础上提高系统的可靠性.在空气预热器前设置装有挡油管的进气装置,除去烟气夹带的油沫,以防止油沫进入预热器内继续燃烧损坏设备.当烟气将大量油沫带入进气装置内燃烧时,挡油管首先熔断,高温烟气从挡油管内排出,同时蜂鸣器报警.此外,在进气装置的前排挡油管内设远传温度计,在第一时间内感知油沫燃烧情况. 相似文献
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Christian P. Deck 《Carbon》2005,43(12):2608-2617
The formation mechanisms involved in the growth of carbon nanotubes (CNTs) by spray pyrolysis was studied. Both iron and nickel were used as catalysts for growth, and nanotubes were also produced using thermal chemical vapor deposition for comparison. Transmission electron microscopy was used to analyze the encapsulated metal catalyst particles found within the tubes, and the dimensions and location of these particles was recorded. CNTs grown by spray pyrolysis were found to have encapsulated particles in both the middle and end of tubes, with large length to diameter ratios. As a result of these observations, it is concluded that nanotubes grown using spray pyrolysis are formed via an open-ended, root growth mechanism. Additionally, the presence of multiple, high aspect ratio particles within single tubes is explained by an additional growth theory. During the continued growth of these CNTs, metal atoms or nanoscale metal catalyst particles deposit in the open ends of growing tubes, forming new particles and helping to prevent tube closure. CNTs grown with thermal CVD did not contain similar elongated particles or particles along the middle of the tubes, indicating that this new growth mechanism is only applicable in the case of tubes grown via spray pyrolysis or other vapor phase CVD growth methods. 相似文献
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表面多孔管降膜沸腾传热研究 总被引:3,自引:1,他引:2
测试了第一二代机械加工表面多孔管的单管降膜沸腾传热性能。对JK-1管和JK-2管的降膜沸腾强化传热机理作了定性分析,并根据实验数据建立了简单的经验关联式。 相似文献
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In recent years, summers in the Northeast, as well as in many other regions of the United States, have reached record high temperatures. These unusually high ambient temperatures have led to the overloading of power transformer coolers, resulting in the inability of the coolers to maintain the top oil temperature of the transformer at an acceptable level. A field-tested solution to this problem is the application of water spray onto the tube bundles of the cooler to enhance the heat transfer. Currently, the standard way of applying water to an overheated transformer cooler is to hose it down. This method has always been implemented without consideration of the spray pattern or quantity or water used, usually resulting in a wastefully high rate of water consumption. An experiment has been setup to determine the performance of a transformer cooler subjected to water spray. This work consisted of the design and implementation of a water spray system to an existing fullscale cooling loop representative of those found on actual transformers. Predictions were also made for the top oil temperature subjected to dry-air cooling and compared with experimental data. The reliability of this model shows that it can be extended for water spray applications. Heat transfer data were obtained for a range of air velocities and water flow rates on this loop. The experimental results show a significant decrease in the top oil temperature of the cooler when water spray is applied to the cooler tubes. However, the enhancement was not as significant for water flow rates above 4 GPM. Distribution of the water spray through the tube bundle were qualitatively made by visual observation. 相似文献
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建立了样机型模块式溴化锂吸收式制冷机高效传热管试验台;对研制成功的高效传热管在接近工业条件下进行了传热传质性能和添加表面活性剂影响的实验研究,提供了可供工程设计使用的关联式,并观察了马拉哥尼对流.实验研究表明,只有将有关技术参数如喷淋密度、冷却水和冷媒水流速等设计在合适的范围内,高效传热管才能取得较好的强化效果;吸收器高效管必须添加适量的表面活性剂,才能获得最佳传热传质效果.使用本文的高效传热管可使一台1160 kW的溴化锂吸收式制冷机节省铜材1700~2000 kg,质量减轻30%~40%. 相似文献
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为了进一步提高水力喷射空气旋流器(WSA)的传质性能,采用理论分析与实验相结合的方法,对其喷孔分布进行了优化研究。提出了基于同层相邻喷孔液相射流边界层相交于中心排气管表面的临界孔间距lc的概念及其计算方法,实验考察了喷孔排列方式和喷孔间距对WSA脱氨传质效果的影响。研究表明,在传质性能上,WSA的射流喷孔按正方形排列优于三角形排列;喷孔间距对脱氨传质效率有明显影响,存在一个较优取值,其值约等于1.28lc;从上往下到中心排气管出口处计算,侧壁开孔区长度应该占中心排气管长度的78%。研究结果为设计具有良好传质性能的WSA提供了依据。 相似文献