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针对文丘里水膜除尘器运行中存在的问题,采用文丘里 旋流板 喷淋 折流板除雾器的方案改造原有的除尘器,在系统阻力理论分析的基础上,采用赛姆洛图表对其理论除尘效率进行估算,与工程改造后实际应用相一致。 相似文献
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平煤集团坑口电厂原有文丘里水膜除尘器不能使排放烟尘达标排放,在保留原有两台文丘里水膜除尘器基础上,并在其前串联两台单室二电场静电除尘器,经改造后,电除尘-文丘里水膜除尘串联组合技术总除尘效率达99.9%,排放浓度为103mg/Nm^3,实现了达标排放。 相似文献
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中小型燃煤炉烟气脱硫方法 总被引:2,自引:0,他引:2
对中小型燃煤炉烟气脱硫方法作了介绍,提出了对湿式除尘器(文丘里除尘器,旋风除尘洗涤塔,冲击式除尘脱硫塔等)的改造方法,以提高其烟气除尘脱硫效率。同时,介绍了干湿两级除尘脱硫系统和利用脱硫碱液及脱硫废水的烟气脱硫技术。 相似文献
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《环境工程学报》2016,(9)
选用欧拉-欧拉多相流模型和RNG k-ε湍流模型对文丘里除尘器流动特性进行数值模拟,首先对2个喷嘴时不同液体速度下的压力降和喉管液体分布情况进行模拟,并与实验值进行了比较,得到了较好的一致性;然后比较了2个喷嘴和4个喷嘴的情况下不同液体速度时文丘里除尘器的压力降和液体分布情况。模拟结果表明:欧拉-欧拉多相流模型可准确地模拟文丘里除尘器内部流场;喷嘴数量对文丘里除尘器内部的压力降和液体分布有较大影响,当相对射流深度为0.2,喉管气速为64 m·s-1,喷嘴数量由2增加为4时,压力降增加了17.17%,在喷嘴数目为4,喉管气速为74 m·s-1,液体速度为12.5 m·s-1时可使液体在文丘里除尘器内部得到较均匀的分布。 相似文献
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以袋式除尘器装置为研究对象,考虑射流偏移,建立了脉冲喷吹清洁的三维CFD数值模型,并进行实验验证;对喷嘴与文丘里管优化设计,修改数值模型,研究了低能耗下的脉冲喷吹清灰效果;在将改进的喷嘴与文丘里管进行工程应用的过程中,研究了其对大气粉尘排放的影响。结果表明,建立的三维CFD模型展现出了高瞬态行为和可压缩效应,即在射流中表现出涡流环与冲击单元现象。与孔喷嘴相比,改进后的喷嘴设计对射流偏移进行了调整,并且使滤袋内脉冲压力增加了5.1%~13.3%,提升了清灰效果。对比喉部直径为85 mm的文丘里管,无文丘里管的设计使得射流不易进入滤袋中,导致滤袋内脉冲压力降低了41.4%~46.3%,引起清灰效果的下降;减小文丘里管喉部直径,可以减少回流,提升滤袋内脉冲压力,改善清灰效果。对比原始装置,安装了改进喷嘴与文丘里管的袋式除尘器能明显降低大气粉尘排放,以上研究结果可为脉冲喷吹清灰除尘器的优化设计提供参考。 相似文献
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烷基苯厂锅炉烟气除尘系统改造选用文丘里麻石水膜除尘器,除尘脱硫废水与碱性冲渣水中和、过滤后再循环泵提升至冲渣系统,实现燃煤锅炉除尘脱硫废水循环利用。改造后的除尘系统运行情况良好,锅炉的烟尘排放浓度及烟气黑度均达到了国家现行三类区排放标准,二氧化硫排放浓度低于国家允许排放标准。 相似文献
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介绍了一种集多种湿法除尘技术之长于一体的新型组合式除尘装置,该装置不仅能有效地消除手烧锅炉燃烧时产生的烟尘,而且实现了除尘水的内循环,消除了其他湿式除尘器所带来的水的二次污染问题。 相似文献
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针对露天矿破碎站粉尘污染严重、治理技术中存在的缺陷,提出了超声波雾化喷雾降尘技术。以平朔安家岭煤矿为例,根据破碎站区域粉尘污染情况,应用数学模型对破碎站粉尘逸散规律进行解算,将模拟结果与现场实测数据对比,确定对卸载坑采用150~300μm雾滴粒径和对破碎机各产尘点采用1~10μm雾滴粒径的机体梁上外喷雾方式,通过对采取治理方案后破碎站粉尘浓度逸散的数值模拟和现场实际应用后的测试数据,显示全尘和呼吸性粉尘降尘效率分别达到94%和82%。结果表明,超声波喷雾降尘技术能有效降低破碎站粉尘浓度,保障了作业人员工作环境和安全。 相似文献
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Nasri S. Kawar Francis A. Gunther William F. Serat Yutaka Iwata 《Journal of environmental science and health. Part. B》2013,48(4):401-415
Abstract Several types of fabrics were laboratory‐tested for their effectiveness in worker protection to pesticide‐laden dust encountered in the agricultural environment. Of the applied <100 mesh dust, penetrations through knitted jersey and woven fabrics were greater than 87% and less than 5.8%, respectively. Treatment of woven fabrics with fluorocarbon polymers curtailed penetration by greater than 60%. Nonwoven fabrics allowed less than 0.5% dust penetration. Parathion mixed with 100‐mesh sieved dust resulted in increasing “ppm”; levels with decreasing particle size; extent of parathion conversion to paraoxon was independent of particle size for the sandy loam dust used. 相似文献
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本文介绍了球团竖炉的烟尘排放特性 ,分析了烟尘回收效益及脱硫、除尘、除雾一体化技术设备 ,该技术设备是一种紧凑合理、高效耐用、性价比高、管理方便、适合国情的大气环境净化技术设备 相似文献
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Xiaochuan Li Xiang Wu Haibin Hu Shuguang Jiang Tao Wei Dongxue Wang 《Journal of the Air & Waste Management Association (1995)》2018,68(1):73-91
In order to address the bottleneck problem of low fine-particle removal efficiency of self-excited dust scrubbers, this paper is focused on the influence of the intermittent gas-liquid two-phase flow on the mesoscale behavior of collector aggregations. The latter is investigated by the application of high-speed dynamic image technology to the self-excited dust scrubber experimental setup. The real-time-scale monitoring of the dust removal process is provided to clarify its operating mechanism at the mesoscale level. The results obtained show that particulate capturing in self-excited dust scrubber is provided by liquid droplets, liquid films/curtains, bubbles, and their aggregations. Complex spatial and temporal structures are intrinsic to each kind of collector morphology, and these are considered as the major factors controlling the dust removal mechanism of self-excited dust scrubbers. For the specific parameters of gas-liquid two-phase flow under study, the evolution patterns of particular collectors reflect the intrinsic, intermittent, and complex characteristics of the temporal structure. The intermittent initiation of the collector and the air hole formation-collapse cyclic processes provide time and space for the fine dust to escape from being trapped by the collectors. The above mesoscale experimental data provide more insight into the factors reducing the dust removal efficiency of self-excited dust scrubbers.
Implications: This paper focuses on the reconsideration of the capturer aggregations of self-excited dust scrubbers from the mesoscale. Complex structures in time and space scales exist in each kind of capturer morphology. With changes of operating parameters, the morphology and spatial distributions of capturers diversely change. The change of the capturer over time presents remarkable, intermittent, and complex characteristics of the temporal structure. 相似文献
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介绍了静电布袋复合式除尘器的结构、材料及除尘原理;布袋除尘器在不同工况下的除尘效率、附加脱硫率、阻力和排放浓度等参数的测试结果;利用布袋除尘器改造静电除尘器时的改造方案、运行中应注意的问题. 相似文献
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