共查询到19条相似文献,搜索用时 375 毫秒
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应用烟气脱硫技术控制燃煤工业锅炉SO2污染--中国燃煤工业锅炉SO2污染综合防治对策(七) 总被引:1,自引:1,他引:1
介绍旋流板塔及其在燃煤工业锅炉烟气脱硫中的应用。研究表明,旋流板塔以气液接触面积大、结构简单、压力降较小。操作稳定为其主要特点。但是,脱硫工艺过程不合理而生成不稳定化合物亚硫酸盐叉可造成严重的二次污染。 相似文献
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烟气生物脱硫技术的应用 总被引:4,自引:1,他引:3
介绍了宜兴协联热电有限公司2×125 MW热电机组采用的烟气生物脱硫工艺,着重阐述了洗涤塔、厌氧反应器、好氧反应器等核心设备的工作原理,并做了简单的技术经济分析,为相似装置的设计提供参考. 相似文献
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本文探讨了烘烤涂料过程中所排溶剂蒸汽对环境污染的控制方法;提出了溶剂回收的较佳工艺——旋流板回收工艺;介绍了回收设备,并着重叙述了旋流板塔的设计计算方法。应用实例表明,该工艺具有回收率高、处理量大、设备简单、操作方便的特点,且有一定的环境、经济和社会效益。 相似文献
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改进后的横流冷却生化曝气塔对合成氨厂造气废水可同时进行冷却,一次生化和二次生化处理。与一般横流冷却塔相比,流程简单,管理方便,占地少;造价仅增加12—34%. 相似文献
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为了使现有花岗岩水膜除尘器的燃煤锅炉烟气净化达标排放,在不更换水膜除尘器的前提下,探讨和比较了后继烟气吸收装置喷淋塔和鼓泡塔的脱硫和除尘机理,提出改进措施。该技术具有工艺流程简单,建设和运行成本低,适用于由于历史原因仍有相当大数量使用的花岗岩水膜除尘器的烟气净化工艺路线的改造。 相似文献
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介绍了烟气脱硫系统中三种主要的吸收塔类型,及烟气在吸收塔中停留时间和喷淋吸收区高度的计算方法。简述了液气比与气速、烟气中SO2含量的关系,并列举了喷淋塔、动力波塔和平流塔等工程实例。 相似文献
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尿素生产中Hydro流化床造粒工艺及其粉尘处理 总被引:3,自引:0,他引:3
介绍了海南富岛化工有限公司Hydro流化床造粒工艺及其粉尘处理技术,将该工艺与传统塔式造粒工艺作了比较,并对运行中的一些问题提出了解决办法。 相似文献
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随着国家环保要求越来越高,火电厂煤场扬尘问题受到越来越多的关注。防风抑尘网作为治理煤场扬尘的有效技术,日益得到广泛的应用。论述了煤场起尘机理、起尘风速及起尘量估算、煤场扬尘预测模式,综合研究了防风抑尘网起尘机理及抑尘效果,提出了起尘风速及起尘量估算推荐公式、煤场扬尘预测推荐模式,并通过数值模拟计算与实测数据,对防风抑尘网抑尘效果进行了分析。 相似文献
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Jugder Dulam 《Water, Air, & Soil Pollution: Focus》2005,5(3-6):37-49
A discriminate analysis method for probability forecast of dust storms in Mongolia has been developed. The prediction method
uses data recorded at 23 meteorological stations in the Gobi and steppe regions of Mongolia, including surface air pressure
and geo-potential height at the 500-hPa level on grid points, and weather maps from 1975 to 1990.
Weather elements such as air temperature, pressure, geo-potential height etc, which influence the formation of dust storms,
are prepared as predictors. To select the most informative/important predictors (variables), we used a mean correlation matrix
of variables together with the Mahalonobis distance, and correlation coefficients between dust storms and predictors with
an orthogonalization for removing correlated predictors. The most informative predictors for dust storm prediction are intensities
of surface cyclones and migratory anticyclones, passage of cold fronts, the horizontal gradients of the surface air pressure
in the cold frontal zone, cyclonic circulations from the ground surface up to the 500-hPa level, the geo-potential height
at 500-hPa level and its temporal changes.
Selected predictors are used in discriminate analysis for formulating dust storm prediction equations. Sandstorm data have
been classified into three classes, viz., strong, moderate and weak dust storms, depending on their intensities, durations
and areas covered. Predictions of the probabilities of dust storm occurrence use the prediction equations for each class.
The prediction is made from 12 hours to 36 hours.
Verification of the probability forecasts of dust storms is also shown. The accuracy of forecasts is 72.2–79.9% with the data
used for developing equations (dependent variables), in contrast to 67.1–72.0% with unrelated data for deriving equations
(independent variables). 相似文献
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Wu Qingli Chung Yong-Seung Zheng Yongguang Tao Zuyu 《Water, Air, & Soil Pollution: Focus》2003,3(2):81-92
To investigate the large-scale environmental conditions of duststorms occurring in Northern China, a synoptic situation of tendust events in Northern China during 2000–2001 was composed andits dynamic features were identified. The composite synoptic situation showed that the occurrence of the ten dust events was associated with the eastward movement of a strong cold high fromMongolia, and the development of a cyclone in Northeast China, which caused the pressure gradient to intensify considerably in Northern China. The upper level circulation revealed that a 500 hPa trough developed rapidly above Northern China, and diagnosis showed that composite ascending motion was pronouncedabove the Siberian district. The change of vertical motion in themiddle and low troposphere above Mongolia was also related to theoccurrence of the ten dust events. When the descendingcurrent, 12 hr before the occurrence, was completely replacedby the ascending current, the instable atmospheric stratificationof the lower troposphere enabled dry dust to be transported from the surface to high altitudes toward Northern China. 相似文献
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Vaughan Shilton Paul Giess David Mitchell Craig Williams 《Water, Air, & Soil Pollution: Focus》2002,2(5-6):237-246
Settled dust has been collected inside the main foyers ofthree University buildings in Wolverhampton City Centre,U.K. Two of the three buildings are located in a streetcanyon used almost exclusively by heavy duty dieselvehicles. The dust was collected on adhesive carbonspectro-tabs to be in a form suitable for analysis byscanning electron microscope and energy dispersive X-rayanalysis. Using these analytical techniques, individualparticle analysis was undertaken for morphology andchemistry. Seasonal variations and variations due tolocation were observed in both the morphologicalmeasurements and chemical analysis. Many of the differencesappear attributable to the influence of road traffic, inparticular, the heavy duty diesel vehicles, travellingalong the street canyon. 相似文献
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We simulated the long range transport of dust emitted from dust storms that occurred in China by using a global three-dimensional chemical transport model. A modified dust emission flux scheme and a nonlocal diffusion scheme for determining the atmospheric eddy diffusivity in the atmospheric boundary layer were implemented to improve the chemical transport model. We examined the dust transport by comparing the model results with TOMS satellite images. The model calculated monthly total deposition of dust masses were used for comparison with the measurements collected at sampling stations in Japan, and good agreement was found. The model generally reproduced the temporal and spatial variations of dust reasonably well. 相似文献
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烟尘浓度分布对二次扬尘影响的探讨 总被引:3,自引:0,他引:3
电除尘器内电场断面烟尘浓度呈非均匀性分布,它是产生振打二次扬尘的重要原因之一,通过改善电场内部气流分布状况和使用出口向上的出气箱,可以减少振打二次扬尘,从而达到电除尘器高效除尘的目的。 相似文献