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燃煤电厂SCR脱硝装置失效催化剂处理方案探讨 总被引:1,自引:0,他引:1
随着燃煤电厂SCR脱硝装置的建设,失效的催化剂的量将急剧增长。本文通过分析燃煤电厂SCR脱硝装置使用的催化剂成分和使用过程中失效的原因,初步探讨了失效催化剂的再生和回收利用方案。认为应该对失效催化剂进行规范合理处置。 相似文献
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选择性催化还原法(SCR)是火电厂常用的外加还原剂还原NOx将其转变为N2和O2的烟气治理方法。还原过程中,催化剂是反应核心部分,但烟气及其携带灰分的性质会致使金属氧化物催化剂失活(中毒),直接影响到火电厂运行的脱硝效率。通过对金属氧化物催化剂中毒机理的分析,提出在采用负载型复合催化剂,根据灰分选择合适催化剂载体结构的同时,适时采用后置式公用SCR布置形式等措施,可达到延长催化剂使用寿命、提高脱硝效率、减少运营成本的目的。 相似文献
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以某典型炼油厂为实验样地,通过对原油炼制过程中各生产装置固体废物排放情况进行调研并检测固废中金属元素含量,对炼厂固废金属来源及迁移规律进行了分析。研究结果表明:炼厂外排固废中主要包含As、Cu、Ni、Cr、Hg、Pb、V等金属元素,其中Ni元素和V元素含量较高,覆盖面广。催化裂化装置外排固废中Ni、V两类金属元素含量较高,汽油吸附脱硫装置固废中Ni、Zn元素含量较高,催化重整装置外排固废中主要含有As、Cu、Ni、Cr、Hg等元素,柴油加氢装置外排固废中主要含有As、Pb、Cu等元素。原油中的V元素除少部分随常减压装置电脱盐废水排出外,大部分沉积在催化裂化催化剂中,并随催化柴油和直馏柴油积累在柴油加氢精制催化剂中;Ni元素主要累积在废催化裂化催化剂,并随相应工艺路线进入汽油吸附脱硫废吸附剂、重整催化剂、柴油加氢精制催化剂和柴油加氢裂化催化剂中;Zn元素的迁移路线为:催化裂化催化剂、重整催化剂中以及脱氯剂的Zn元素随催化汽油进入加氢脱硫装置,并大量沉积在汽油吸附脱硫吸附剂和柴油加氢精制催化剂中;原油中的As、Cu、Pb元素随相应的工艺路线,最终大量沉积在加氢精制废催化剂中。 相似文献
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燃煤烟气中的氮氧化物(NOX)脱除,国际上主要采用SCR法,但SCE催化剂制备工艺技术是制约我国脱硝技术产业化的瓶颈。对催化剂配方和成型工艺进行优化和创新研制的TZ型板式催化剂填补了国内空白。 相似文献
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选择性催化还原(SCR)是目前控制氮氧化物排放的主要技术。本文介绍了锅炉炉后脱硝系统的布置位置及工艺条件、已经工业化的氨选择性高温还原钒催化剂的特点,以及近年来低温脱硝催化剂的研究现状。指出我国脱硝催化剂应提高还原剂的选择性,开发新型低温催化剂应重点考察烟气中的水、二氧化硫及硫酸氢铵等对催化剂的影响。 相似文献
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In this work, the electrochemical oxidation of pyrogallol (1,2,3-trihydroxybenzene) on boron-doped diamond anodes has been studied. The voltammetric results showed that pyrogallol oxidation takes place in the same potential region as that of phenol where the supporting electrolyte is stable. Synthetic wastewaters containing pyrogallol have been treated in a bench-scale electrolysis plant. This plant operates in a discontinuous mode by recirculating the waste continuously through a single-chamber electrochemical flow cell. The complete mineralization of pyrogallol and the electro-generated pollutants is obtained in the electrolytic device. HPLC analyses show the formation of carboxylic acids as the main intermediates. The efficiency of the electrochemical process was found to depend mainly on the pollutant concentration present in the waste and on the applied current density. The high efficiency of this technology can be explained in terms of the direct electro-oxidation at the BDD surface and the oxidation carried out by hydroxyl radicals and other electro-generated oxidants. 相似文献
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Donald N. Duvick 《Journal of Agricultural and Environmental Ethics》1995,8(2):112-125
Biotechnology can provide appropriate new tools for use in solution of specific problems in sustainable agriculture. Its usefulness will depend in large part on the degree to which sustainable agriculturists understand the utility of biotechnology and apply it toward ends they deem important. Biotechnology can give little assistance to sustainable agriculture in the short term. It can be more useful in the medium term, and it could be highly useful in the long term as an integral part of the art and science of plant breeding and other components of sustainable agriculture systems. 相似文献
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随着城市生活水平的提高,室内装修装饰日益普及.各种新材料的引入,使得室内的各种有害气体总量日益增加.长期生活在这样的环境下,会对人体健康产生极为不利的影响.居民生活用煤气,在给人们生活带来便利的同时,作为一种可燃性、有毒气体,也具有极强的危害性.因此,研制一种能检测多种有害气体的实用仪器,具有很大的应用价值.本仪器为便携式多功能仪器,采用可充电电池供电,可以检测ppb的挥发性气体,显示气体浓度值,也可检测煤气,并具有声光报警功能. 相似文献
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Innovative approaches to rural development: Moving from state-controlled towards market-based land reform 总被引:1,自引:0,他引:1
Frederico Neto 《Natural resources forum》2004,28(1):50-60
Among the world's poor, approximately 75% of those in extreme poverty live and work in rural areas and two‐thirds of them depend mainly on farming or farm labour for their livelihood. Policies to grant the rural poor secure access to land and water for irrigation — and to improve the economic efficiency of small‐scale agriculture — can thus play a critical role in the implementation of rural development strategies, including efforts to combat rural poverty. Since inadequate access to arable land is probably the most important cause of rural poverty, redistributive land reform is increasingly seen as crucial for socio‐economic development and poverty alleviation in many developing countries with substantial amounts of (unused) arable state land or (under‐utilized) large private landholdings. This article argues that market‐based land redistribution schemes, such as the one being implemented in South Africa, can be considered one of the most innovative approaches to land reform that have emerged over the last decade. These schemes thus provide a useful alternative to more conventional, state‐controlled land redistribution programmes. The article concludes, however, that when countries opt for market‐based approaches to land redistribution, the State still has an important role to play, without necessarily deciding which land parcels change hands. 相似文献
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Bryan G. Norton 《Journal of Agricultural and Environmental Ethics》2007,20(4):387-405
Critics of my book, Sustainability, have raised many objections which are addressed. In general, I emphasize that the book is an integrative work; it must be
long and complex beause it attempts a comprehensive treatment of problems of communication, of evaluation, and of management
action in environmental discourse. I explain that I depend upon the pragmatists and on work in the pragmatics of language
because the current language of environmental policy discourse is inadequate to allow deliberative processes that can reach
consensus and cooperative actions. I revise my account of risk analysis somewhat, and defend my broad approach to the concept
of sustainability. Finally, I discuss applications of my book to the current situation in environmental policy discourse. 相似文献
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Hugo A. Loiciga 《Journal of the American Water Resources Association》2005,41(4):949-958
Droughts constitute one of the most important factors affecting the design and operation of water resources infrastructure. Hydrologists ascertain their duration, severity, and pattern of recurrence from instrumental records of precipitation or stream‐flow. Under suitable conditions, and with proper analysis, tree rings obtained from long living, climate sensitive species of trees can extend instrumental records of streamflow and precipitation over periods spanning several centuries. Those tree‐ring “reconstructions” provide a valuable insight about climate variability and drought occurrence in the Holocene, and yield long term hydrological data useful in the design of water infrastructure. This work presents a derivation of drought risk based on a renewal model of drought recurrence, a brief review of the basic theory of tree‐ring reconstructions, and a stochastic model for optimizing the design of water supply reservoirs. Examples illustrate the methodology developed in this work and the supporting role that tree‐ring reconstructed streamflow can play in characterizing hydrologic variability. 相似文献
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James H. Lambert Jeffrey M. Keisler William E. Wheeler Zachary A. Collier Igor Linkov 《The Environmentalist》2013,33(3):326-334
While the cybersecurity field has focused primarily on software and network security, threats and vulnerabilities of hardware device supply chains are growing concerns. Of particular importance and interest in this vein is the way in which semiconductors and other electronic devices are increasingly deployed to support energy distribution, storage, and control at a variety of scales. Future smart grid supply chains must be secured to prevent cyber attacks from affecting energy infrastructure, and the societal and economic functions on which they depend. This perspective paper calls for a multiscale approach to address modeling and decision-making for energy system hardware supply chains. A multiscale approach, as discussed in this paper, can facilitate resilience of supply chains across the life cycles of these systems, through low- and high-tech techniques to monitor and act on the supply chain. This can incorporate both qualitative and quantitative factors to suit the variety of stakeholders, geographic scales, organizational levels, and planning and operational time horizons. 相似文献
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J. B. Ruhl 《Journal of the American Water Resources Association》1999,35(3):519-526
ABSTRACT: Ecosystem management has become an important unifying theme for environmental policy in the past decade. Whereas the science of ecosystem dynamics suggests that it will remain difficult to define ecosystem borders and all of the natural and anthropogenic effects that influence them, the politics of ecosystem management require that a national ecosystem delineation standard be adopted. Moreover, a political framework for ecosystem management decision making must be designed in such a way as to complement the hierarchical, interrelated nature of ecosystems generally. This paper advocates that a watershed-based ecosystem delineation standard is the most politically suitable because it will be easily understood by the public and watersheds have a long history as a medium of environmental policy. The paper then proposes that the political framework for watershed-based ecosystem management must depend heavily on state and local autonomy, subject to federally prescribed standards and goals. The Coastal Zone Management Act provides a model for how a national ecosystem management policy can work within state and local watershed cultures and economies. 相似文献