超声波雾化油喷嘴雾化性能的试验研究

文章综述了超声波油喷嘴的结构特点,介绍了超声波油喷嘴雾化性能的试验研究及结果.     

改善连铸机气雾喷嘴性能的设计

为了提高产品质量和生产力，必须改进二冷喷嘴系统的效率。新型的喷嘴和气／水系统提供了更好的水的分布，减少了表面缺陷、角裂及中心偏析。除此之外，还扩大了产品大纲并提高了生产能力，带来很大的成本效益。     

冷轧带钢气雾冷却的探讨

分析和比较了气雾冷却使用的原因,介绍了气雾冷却系统的组成和原理,重点说明了气雾冷却设备的组成和功能,为以后冷轧带钢气雾冷却的研究和发展提供了参考。     

节能型气雾喷嘴的研制与应用

本文介绍了引射式气雾喷嘴的研制和应用情况。这种喷嘴突破了传统的垂直相交式或斜交式的格局,提高了气体对水流的引射能力,改善了雾化状况和冷却效果,应用于生产中,提高了铸坯质量;气水比由原来的40降为15,节约了大量的压缩空气。此外,减少了喷嘴型号,除喷嘴外的其它部件可以互换,使用方便。     

气雾两相流喷嘴的研究

建立了描述气雾两相喷嘴中流动行为的理论模型，并通过实验验证。计算和实验表明，单相流空气压降随喷直径的增大而减小；两相流压降随水流量的增大而增大；单相流和两相流压降随空气流量的增大而增大。     

机械雾化喷嘴

一、工作原理机械雾化型喷嘴是发展最早、研究最深、现在仍然广为应用的一种类型喷嘴。这种类型的喷嘴以燃料油的液压为动力,通过喷嘴将压力所具的势能转化为动能,燃料油高速     

超声波雾化喷嘴的设计

在超声波雾化设计原理的基础上，将雾化喷嘴按照用途进行了分类，总结了三类超声渡雾化喷嘴。在研究雾化汽油等燃料类的喷嘴、雾化水类的喷嘴的基础上。着重叙述了制取微细金属粉末的超声波雾化喷嘴；在固体雾化技术研究的基础上。研制成一种新型的雾化喷嘴——双层固体技术雾化喷嘴，叙述了它的工作原理和雾化机理，并进行了简单的实验验证。     

宝钢二炼钢LT系统喷嘴雾化特性实验研究

对宝钢二炼钢LT系统蒸发冷却器所用的气雾两相流喷嘴的雾化特性进行了实验研究和分析。实验包括流量压力特性、雾化角、颗粒度的测试等。测试结果表明该喷嘴雾化效果较好，液滴SMD在11—69μm范围内，喷嘴的气体参数与水状态参数彼此无影响。研究结果为优化喷嘴布置提供了依据。     

常化炉气雾冷却系统的应用

为了满足高牌号无取向硅钢和高磁感取向硅钢常化退火的工艺要求,设置了常化炉冷却段,通过气雾、空气及喷淋水达到带钢冷却要求。其中气雾冷却段要求最高,故气雾冷却技术越来越受到关注。目前工业上应用的两相流冷却技术主要采用空气雾化水,雾化后的气体和水滴的混合物直接喷射到带钢表面以较快冷却带钢。气雾冷却具有换热系数大、冷却效率高等优点,是一种较为理想的冷却方式。     

喷嘴喷雾冷却特性测试系统的研制及应用

介绍了自主开发的喷嘴喷雾特性测试系统组成，该系统具有自动化程度高、操作简单等特点，对该装置在喷嘴制造和使用厂的用途和必要性进行了介绍。     

超声波重油喷嘴雾化特性的研究

介绍了一种新型流体动力式超声波重油雾化喷嘴。为了研究其雾化特性,以压缩空气和水为介质,利用激光粒度分析仪对超声波重油雾化喷嘴的雾化特性进行了详细的研究,分析了该型喷嘴的工作特点,研究了不同供气压力、供水压力和气液比(ALR)对喷嘴雾化性能的影响,同时也分析了粒径沿程变化情况。研究表明:流体动力式超声波重油雾化喷嘴雾化索太尔平均粒径非常小,为10～20μm,具有较好的应用前景。     

An experimental study on the atomization characteristics of the nozzle for the after-pot cooling of galvanized steel sheets

Air-atomized fog cooling is particularly suitable for the after-pot cooling of galvanized steel strips.With air and water serving as working media,an experimental study was conducted on the atomization characteristics of a newly-developed cross-flow type of fog nozzles.The water flux distribution,spray angle and pressure of water and air were measured.The results show that the water droplet size was small and insensitive to the water flow rate.The spray angle was small and the water flow rate slightly affected the air pressure in the chamber.An empirical correlation between the pressure in the chamber and the gas flow rate was obtained for the purpose of equipment design.     

气体雾化中喷嘴的选择对制备微细粉末的影响

在气体雾化过程中,采用限制式喷嘴以实现超音速气流雾化,能有效细化粉末颗粒。在一定条件下,提高气／液流量比是获得较高细粉收得率的有效途径。     

宝钢1930板坯连铸机二冷喷嘴现状及探讨

结合现场喷嘴的实际应用情况及喷嘴测试结果，分析了1930连铸机喷嘴及其布置上存在的问题，并提出了相应对策。     

Ultra Fast Cooling of a Hot Steel Plate by Using High Mass Flux Air Atomized Spray

In the current research, the ultra fast cooling (UFC) of a hot stationary AISI‐304 steel plate has been investigated by using air atomized spray at different air and water flow rates. The initial temperature of the plate, before the cooling starts, is kept at 900°C or above. The spray was produced from a full cone internal mixing air atomized spray nozzle at a fixed nozzle to plate distance; and the average spray mass flux was varied from 130 to 370 kg m^?2 s by selecting different combinations of air and water flow rates. The surface heat flux and surface temperature calculations have been performed by using INTEMP software and the calculated results have been validated by comparing with the measured thermocouple data. The heat transfer analysis indicates that the cooling occurs in the transition boiling regime up to surface temperature of 500°C and thereafter it changes to nucleate boiling regime. The superposed flow of air on the hot plate enhances the cooling in the temperature range of 900–500°C by sweeping the partially evaporated droplets from the hot surface. However, due to the high percentage of fine water droplets in the resultant spray produced at higher air flow rates, the maximum cooling rate is achieved at the medium air flow rate of 30 N m³ h^?1. The cooling rate (182°C s^?1) produced by an air atomized spray is found to be in the UFC regime of a 6 mm thick steel plate. The findings of this research can be considered as the basis for the fabrication of cooling system in the run‐out table of a hot strip mill.     

Simulation of Gas Flow Field in Laval Nozzle and Straight Nozzle for Powder Metallurgy and Spray Forming

Gas flow field in nozzles and out of nozzles was calculated for Laval orifice and straight orifice nozzles. The results showed that the flow generated by the Laval nozzle had a higher exit velocity in the vicinity of the nozzle, in comparison with that of the straight nozzle, that is to say, a Laval nozzle was more efficient than a straight one in disintegrating the melt stream and was apt to produce finer powders. The flow generated by the Laval nozzle was less convergent and the velocity gradient along the radial direction was more moderate than that of a straight nozzle, which could contribute to a broad distribution of melt particles. According to their flow characteristics, the Laval nozzle was reckoned as a better choice of producing larger spray-formed billets.     

混合室喷孔对SNCR内混喷枪雾化特性的影响

选择性非催化还原法(SNCR)脱硝系统中,还原剂喷枪的雾化特性对脱硝效率存在明显影响。通过改善喷枪的雾化特性以及提高喷枪对烟气的穿透深度,可以有效地提高脱硝效率。因此实验研究了SNCR内混喷枪的混合室喷孔结构对雾化特性的影响。实验设计了三种结构喷孔,研究了在不同气、液压力下三种喷孔的流量特性和雾化特性。实验表明:混合室喷孔结构对流量特性影响较小;扇形喷孔的喷枪的雾化效果最好,且液滴颗粒有粗有细,一大圆孔的喷枪水平射程最大。     

转炉氧枪喷头的优化设计与应用

介绍了转炉氧枪喷头设计中几个重要参数的选取与优化。结合氧枪喷头在生产实际中的使用情况，总结出氧枪喷头在设计制造及使用中的最佳操作原则，为氧枪设计者及炼钢厂使用氧枪提供了可靠依据。     

80CrNiMo轧辊气雾冷却试验研究

通过热模拟机测量不同冷却方式试样温降曲线及相关试验,重点进行了80CrNiMo轧辊水冷与气雾冷却热传导、冷却强度对比分析及达到同等冷却强度时水量的消耗比较.试验结果表明,达到相同冷却效果,气雾冷却方式需要水量相当于水冷方式水量的1/15,气雾冷却水蒸发量大,水滴小,单位面积带走热量大,传热系数提高,冷却更均匀,冷却效果更好,应用到实际工业生产中,效益潜力巨大.