共查询到18条相似文献,搜索用时 93 毫秒
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火电厂现有污染物控制设备脱汞应用 总被引:1,自引:0,他引:1
从当前严峻的国际汞污染问题出发,根据我国"十二五"汞防治形势,阐述了燃煤火电厂利用现有污染物控制设备控制汞排放技术。得出实现脱硫脱硝除尘脱汞一体化,是最为可行的脱汞途径。 相似文献
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燃煤烟气汞污染近些年来被世界公认为又一大污染问题,本文较为详细地论述了汞排放控制技术现状及研究进展.目前有多种在研的汞控制技术,其中湿法洗涤和烟气中喷入活性炭吸附荆方式等较有发展潜力,但现在还没有一种适用性强的技术可广泛推广.最后介绍了烟气脱汞的一些新技术,并对脱汞技术的发展前景进行了展望. 相似文献
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燃煤电厂汞污染已经成为继SO2污染之后的又一重大污染问题。燃煤烟气中汞污染的控制研究是目前重要的环保课题之一,开发高效、低成本、无二次污染的烟气脱汞技术已成为研究重点。本文综述了国内外在汞的监测方法、汞在燃煤电厂中的迁移规律以及汞污染物控制措施等方面的研究进展,并做了简要的分析与总结,对未来燃煤烟气汞污染控制技术的发展进行了展望。 相似文献
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燃煤电厂汞污染已经成为继SO_2污染之后的又一重大污染问题。燃煤烟气中汞污染的控制研究是目前重要的环保课题之一,开发高效、低成本、无二次污染的烟气脱汞技术已成为研究重点。文章综述了国内外在汞的监测方法、汞在燃煤电厂中的迁移规律以及汞污染物控制措施等方面的研究进展,并做了简要的分析与总结,对未来燃煤烟气汞污染控制技术的发展进行了展望。 相似文献
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燃煤电厂汞污染越来越受到关注,目前具有应用前景的脱汞方法为吸附脱汞,因此研发高效低成本的脱汞吸附剂被广泛研究。在搭建的固定床吸附反应系统上对自制的褐煤活性焦脱汞性能进行了实验研究,研究了汞污染物的入口浓度,吸附剂的量、烟气成分及吸附剂的种类对吸附汞的影响。结果表明:活性焦吸附剂对烟气中的气态汞均有一定的吸附能力,其吸附效果随着入口汞浓度和吸附剂量的增加而增加;烟气中的SO2、NO气体对活性焦吸附汞有一定的促进作用。活性焦脱汞效率与载硫活性炭、脱汞专用活性炭相比还存在一定差距,但可通过改进活性焦的活化方式提高脱汞性能。 相似文献
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介绍了燃煤过程中汞的危害、排放状况及存在形式。针对燃煤烟气汞污染的特点,综述了当前汞污染控制技术的现状及研究进展。重点阐述了常规的碳基、非碳基吸附剂汞污染控制技术及新型汞污染控制技术的优缺点,后对汞污染控制技术进行展望,可为燃煤烟气汞污染控制提供理论基础。 相似文献
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燃煤电厂是最主要的汞排放源,本文介绍了电厂燃煤过程中汞的存在形态及影响汞去除率的主要因素;通过介绍燃煤电厂的基本烟气净化流程,指出利用现有烟气净化设备协同除汞的可行性;并较为详细地论述了各种汞排放控制技术的研究进展,同时对烟气脱汞技术的研究趋势进行了展望。 相似文献
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Mercury speciation in gypsums produced from flue gas desulfurization by temperature programmed decomposition 总被引:3,自引:0,他引:3
Temperature programmed decomposition was used to identify mercury (Hg) species in gypsum samples produced from flue gas desulfurization in two Spanish power stations (A and B). As stricter emission control/reduction policies, particularly those focusing on Hg, are being implemented, wet flue gas desulfurization (FGD) technologies used for the removal of SO2 can result in the co-removal of highly-soluble oxidized Hg. The amount of Hg retained in FGD products may increase in the future if these units are optimized for co-capture. For this reason, it is important to identify the mercury species in FGD products not only to determine the potential risk when the wastes are finally disposed of, but also to understand the behaviour of mercury during combustion and therefore to improve the technologies for mercury removal. Different mercury species were identified in the gypsum samples. In power station A, HgS were the most probable Hg species, whereas in power station B the main compound was Hg halogenated compounds. 相似文献
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《Fuel》2006,85(10-11):1389-1395
Mercury is considered to be a toxic metal of major concern, while coal combustion is recognized as one of the main anthropogenic sources of this element. Various processes have been investigated for mercury control in coal-fired utilities. However, until now, no cost-effective or efficient technology has been established for the removal of mercury emissions from coal combustion. For the development of such technologies a deep knowledge of the mode of occurrence and association of mercury compounds in different coals is necessary. Size fractionation, density separation, and oil agglomeration procedures were evaluated in this work not only to assess their efficiency as cleaning methods in mercury removal, but also to determine the associations of mercury with mineral/organic phases. Although the efficiency for mercury removal was found to be generally low, the results obtained provided valuable information for identifying the modes of occurrence of mercury in coal. 相似文献
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总结了当前燃煤烟气脱汞常用的协同脱汞技术和贵金属、金属氧化物基可再生吸附剂技术发展现状,分析了各方法的优势与存在的问题,对未来磁性可回收吸附剂的发展方向和趋势进行了展望。针对现有脱汞技术效率低、易造成二次污染等缺陷,提出了使用飞灰磁珠制备廉价可回收脱汞吸附剂的新思路。通过大量试验开发了负载Co_3O_4或CuCl_2的磁珠改性方法以增强脱汞能力和抗烟气组分干扰能力,从而能够适用于低氯复杂烟气气氛。设计了改性磁珠吸附剂喷射脱汞工艺流程,可兼顾高效脱汞与低廉的运行成本,并通过磁珠回收再利用彻底避免汞进入环境造成污染。 相似文献
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Development and testing of mercury control technologies have largely focused on coal-fired combustion systems, with less emphasis on advanced power systems. Mercury control is influenced by coal properties and chemistry, plant configuration, pollution control devices, flue gas conditions, and plant operations, which differ between combustion and gasification systems. Sorbents such as treated activated carbons have shown promising results in low-temperature environments; however, elevated temperature and reducing environments of many advanced systems remain challenging, requiring research and development to obtain acceptable mercury control levels. Concurrent pollutant/multipollutant control strategies that include CO2 control are critically needed for both conventional and advanced power systems. 相似文献
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综述了煤炭在利用过程中汞的脱除技术,以及国内外在脱汞方面的研究现状,根据目前的一些技术现状,提出脱汞技术的研究和发展方向,加强脱汞技术的研究对社会发展、环境保护和人类健康有重要意义。 相似文献