共查询到19条相似文献,搜索用时 318 毫秒
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随着环保事业的飞速发展,近几年来我国在酸雾治理技术上已有了很大进展。造成酸雾危害的行业主要是化工和冶金。化学工业引起酸雾的原因是:(1)酸液受到泼溅、喷雾、泡沫等表面起雾的力学作用,引起雾粒。其雾粒直径一般在10微米以上。(2)气体在饱和或过饱和状态下相的变化如:晶核作用、冷却、冷凝、化学反应、 相似文献
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针对土壤热脱附装置存在着严重的扬尘问题,将声波团聚联合喷雾的方法应用于热脱附装置的除尘,研究了声频、粉尘初始浓度、声压级和喷雾流量等对除尘效果的影响(粉尘的平均粒径小于10μm)。实验发现,在声频为1 400 Hz、喷雾浓度为1.0 L·m-3的条件下,团聚室的除尘效率在60 s内达到98%;声压级从145 dB提高至153 dB后,除尘效率提高了38%;SEM结果表明,声波处理后的颗粒被碾碎并团聚;添加喷雾可以提高除尘效率,但不同的喷雾浓度对最终的除尘效率影响不大,施加喷雾后的最佳声频仍为1 400 Hz;粉尘和喷雾的初始浓度越大,团聚前期的除尘速率和最后的除尘效率越大,当喷雾浓度为2.0 L·m-3时比没有喷雾时的除尘效率提高了44%,说明声波团聚对高浓度气溶胶的使用效果更好,研究结果可为热脱附装置除尘技术的研发提供参考。 相似文献
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喷雾干燥法烟气脱硫工艺评述 总被引:7,自引:0,他引:7
喷雾法烟气脱硫工艺是20世纪80年代初才出现的一种新的烟气脱硫工艺,与传统的湿式石灰-石膏法相比,具有系统简单、投资少、运行费用低、干燥后的废渣易于处理等优点。本文介绍了喷雾法脱硫工艺的机理、影响因素、技术经济指标及应用前景。 相似文献
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介绍了喷雾吸 脱硫装置的技术特点,对国内外脱硫装置的技术经济进行了对比分析,提出了适于我国实际情况的脱硫装置的开发,研制方向。 相似文献
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义马矿区矸石山经喷雾降尘和绿化后,大大降低了矸石山扬尘的污染,植被覆盖率逐年提高,使矿区及周边环境得到明显改善: 相似文献
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介绍了液碱喷雾脱硫法在正压状态下的实践应用,具体阐述了工程的特点以及使用情况,说明这一改造方案不仅可行,而且具有投资少,操作管理简便,运行成本低,效果稳定等特点。 相似文献
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Minimum quantity lubrication (MQL) is a cost-effective and environmentally friendly alternative to flood cooling. MQL spray jet has been shown to have potential to be applied successfully in different machining processes. Since the amount of lubricating liquid employed in MQL jet is very low, it is necessary to generate and apply the MQL spray efficiently. However, efficient application of MQL is not only related to spray atomization characteristics and delivery parameters but is also affected by machining conditions. The present paper demonstrates a theoretical and experimental investigation on the spray atomization and delivery parameters in the grinding process of Al2O3 engineering ceramics. The spray atomization characteristics studied are carrier gas velocity, liquid droplet size and liquid droplet velocity. Experiments were performed to verify the delivery parameters of MQL spray including nozzle angle, nozzle distance, lubricant flow rate and gas flow rate in the case of Al2O3 ceramics grinding. The experimental results confirm the theoretical outcomes and indicate that by applying optimal spray delivery parameters efficient lubrication takes place. Moreover, efficient lubrication of Al2O3 ceramics grinding can decrease the challenges existing in ceramics grinding processes by reducing grinding forces and surface roughness. 相似文献
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目的 获取海洋生态环境条件下火工药剂性能变化的规律,开展火工药剂在盐雾环境中的安定性试验研究,以保障火工药剂的可靠性。方法 通过SEM成像技术和X–射线衍射技术表征2种典型起爆药叠氮化铅(Lead Azide,LA)和斯蒂芬酸铅(Lead Styphnate,LS)在盐雾试验前后微观形貌及组分的变化,并结合DSC热分析技术,从热分解动力学角度,开展火工药剂在盐雾环境影响下失效机理的研究。结果 在盐雾环境应力的影响下,LA的长柱状晶体结构发生脆化,层裂成不规则的小片状晶型,且随着盐雾试验时间的增加,LA的热分解反应峰会逐渐前移,试验后产物组分只有Pb(OH)Cl,其本质安定性显著下降。LS受盐雾环境应力的影响,其棱柱状晶体结构会层裂为小片状晶型,且部分LS分解形成Pb3(CO3)2(OH)2,导致其安定性降低。结论 2种典型火工药剂LA和LS受盐雾环境应力因素的影响,都会发生失效分解反应,与LA相比,LS在盐雾环境下具有更加稳定的安定性能。 相似文献
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发展湿法烟气脱硫气液两相反应进程的原位在线测量技术有助于研究脱硫反应的传质过程,提高脱硫效率.本文选取双碱法中的Na2CO3喷雾液滴吸收SO2气液两相反应作为测量对象,利用自行研发的紧凑型彩虹折射仪搭建了全场彩虹测量系统,测量了喷雾液滴的折射率,通过反应过程中雾滴折射率的变化表征Na2CO3喷雾液滴吸收SO2气液两相反应的进程.结果表明,随着Na2CO3喷雾液滴吸收SO2气液两相反应的进行,喷雾液滴中的溶质Na2CO3逐渐转变成Na2SO3,液滴的折射率逐渐增大.依据Na2CO3的转化比例随液滴折射率的线性变化,推算出测量段内Na2CO3消耗量约为62.1%,进而计算出Na2CO3喷雾液滴吸收SO2气液两相反应速率为8.8×10-6kmol/(m2·s). 相似文献
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Chandra Nath Shiv G. Kapoor Richard E. DeVor Anil K. Srivastava Jon Iverson 《Journal of Manufacturing Processes》2012,14(4):452-459
Tool life has been a vital issue in machining titanium alloys. Recently, an atomization-based cutting fluid (ACF) application has been found to be an effective approach for cooling and lubrication in micromachining operations. In this study, an ACF spray system is developed for macro-scale turning of Ti–6Al–4V. The spray system is designed to minimize interaction between the fluid droplets, and the gas nozzle to control the divergence of the fluid droplets. Experiments are conducted to study the effect of five specific ACF spray parameters including fluid flow rate, spray distance, impingement angle, and type and pressure level of the droplet carrier gas on cutting forces, tool life, and chip characteristics. It has been observed that the combination of lower pressure (150 psi) air-mixed CO2 with a higher flow rate (20 ml/min) and a larger spray distance (35 mm) produces a significantly longer tool life and broken chips. The results also reveal that the ACF spray system can extend tool life up to 40–50% over flood cooling. 相似文献