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电站燃煤锅炉全负荷SCR脱硝控制技术探讨 总被引:1,自引:0,他引:1
为了解决燃煤电站锅炉在低负荷时由于SCR入口烟温低于SCR催化剂正常工作温度窗口而导致脱硝系统无法投运的问题,主要对策有增加省煤器旁路、提高锅炉给水温度、省煤器分级技术以及开发宽温度窗口SCR脱硝催化剂。这些方法能在一定程度上改善低负荷SCR脱硝系统运行情况,目前国内所采用的省煤器旁路烟道等技术是以牺牲一定的经济性为代价的,高效节能锅炉全负荷SCR脱硝控制技术的研究对于逐步改善周围大气环境质量具有显著的经济效益和社会效益。本文旨在为燃煤锅炉进行全负荷SCR脱硝控制提供参考。 相似文献
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国家环保标准明确规定,电站锅炉必须配备脱NOx的设备,目前烟气脱硝技术主要分为SCR和SNCR两种技术,SCR技术在电站锅炉上得到了广泛的应用,本文主要介绍尿素热解作为还原剂的SCR技术在电站锅炉中的应用。 相似文献
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在运行可靠性、安全性、环境保护、节约能源和运行经济性几个方面,将循环流化床锅炉与其它燃煤锅炉进行了比较。通过比较认为,循环流化床锅炉是建设热电厂、蒸汽热力站和采暖供热站应该首先考虑采用的炉型。 相似文献
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排烟温度偏高是国内电站锅炉普遍存在的问题,排烟温度较高时严重影响电厂的热经济性,因此,降低排烟温度对于节能降耗、提高锅炉的安全可高性具有重要的现实意义。通过煤粉炉改造实践和利用等效焓降法分析加装低压省煤器后的经济效益,结果表明低压省煤器系统不仅能降低锅炉机组排烟温度,而且能降低煤耗,提高锅炉的运行经济性,在电厂余热回收方面具有重要作用。 相似文献
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燃煤锅炉烟气脱硫技术的研究分析 总被引:1,自引:0,他引:1
本文综述了我国锅炉烟气脱硫技术研究历史、现状及近年来引进的烟气脱硫技术示范工程应用情况,分析了各种烟气脱硫技术的特点及存在的不足,提出了对于大型电站燃煤锅炉,可采用石灰石/石膏回收法等先进的烟气脱硫装置,但投资大;对于大量的中小型燃煤锅炉,由于烟囟较低,其排放的二氧化硫对地面的贡献率高达45%,急需研究开发一种价格适,脱硫效果达标,适合中国国情的实用烟气脱硫装置,推动我国的燃煤锅炉烟气脱硫技术的发展。 相似文献
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Energy and environment are drawing greater attention today, particularly with the rapid development of the economy and increase consumption of energy in China. At present, coal-fired power plants are mainly responsible for atmospheric air pollution. The selective catalytic reduction (SCR) technology is a highly effective method for NOX control. The present study identified and quantified the energy consumption and the environmental impacts of SCR system throughout the whole life cycle, including production and transportation of manufacturing materials, installation and operation of SCR technology. The analysis was conducted with the utilization of life cycle assessment (LCA) methodology which provided a quantitative basis for assessing potential improvements in the environmental performance of the system. The functional unit of the study was 5454 t NOX emission from an existing Chinese pulverized coal power plant for 1 year. The current study compared life cycle emissions from two types of de-NOX technologies, namely the SCR technology and the selective non-catalytic reduction (SNCR) technology, and the case that NOX was emitted into atmosphere directly. The results showed that the environmental impact loading resulting from SCR technology (66810 PET2000) was smaller than that of flue gas emitted into atmosphere directly (164121 PET2000) and SNCR technology (105225 PET2000). More importantly, the SCR technology is much more effective at the elimination of acidification and nutrient enrichment than SNCR technology and the case that NOX emitted into atmosphere directly. This SCR technology is more friendly to the environment, and can play an important role in NOX control for coal-fired power plants as well as industrial boilers. 相似文献
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《Energy Policy》2006,34(17):3124-3136
The paper aims to present the current status of the coal-fired power sector in Russia, the prospects for renovation activities based on Clean Coal Technologies (CCT) and two case studies on potential refurbishment projects. Data were collected for 180 thermoelectric units with capacity higher than 100 MWe and the renovation needs of the power sector, among the retrofitting, repowering and reconstruction options, were estimated through a multi-criteria analysis. The most attractive system to renovate a power plant between the Supercritical Combustion (SC) and the Fluidized Bed Combustion (FBC) technologies was evaluated. The application of each of the aforementioned technologies at the Kashirskaya and Shaturskaya power plants was studied and their replication potential in the Russian coal-fired power plant park was examined.Nowadays, the installed capacity of coal-fired power plants in the Russian Federation is 29.3 GWe, while they account for about 19% of the total electricity generation in the area. The low efficiency and especially the advanced age are the determinant factors for renovation applications at the Russian units. Even in the more conservative modernization scenario, over 30% of the thermoelectric units have to be repowered or reconstructed. Concrete proposals about the profitable and reliable operation of two Russian thermoelectric units with minimized environmental effects were elaborated. A new unit of 315 MWe with supercritical steam parameters and reburning for NOx abatement is envisaged to upgrade Unit 1 of Kashirskaya power station, while new Circulating Fluidized Bed (CFB) boilers of the same steam generation is the most promising renovation option for the boilers of Unit 1 in Shaturskaya power station. 相似文献
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低NOx燃烧器在燃煤电站锅炉中的应用与前景 总被引:7,自引:0,他引:7
当前国内燃煤发电站运行过程中产生的大量NOx是大气污染的主要因素之一,因此,燃煤发电锅炉采用低NOx燃烧器是降低NOx排放的最经济有效措施。分析了NOx成因、影响因素和降低方法,介绍了我国燃煤常规目前使用的几种低NOx燃烧器的各自特点,并分析了低NOx燃烧器的应用前景。 相似文献
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高碳能源低碳化利用途径分析 总被引:17,自引:0,他引:17
煤炭领域是中国发展低碳经济的重点领域,本文主要围绕发电、工业锅炉、煤化工三大用煤领域阐述煤炭提质加工技术、高效燃煤发电技术、工业锅炉洁净燃煤技术以及新型煤化工技术等低碳化途径的碳减排潜力和发展态势,为煤炭领域如何依托洁净煤技术实现高碳能源低碳化利用提供方向。 相似文献
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锅炉设计煤种是电站锅炉及其辅机系统进行设计和选型最重要的依据和基础。文中结合某工程实例,分析煤质偏差给锅炉及主要辅机带来的影响。 相似文献
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In 1995 ELSAM/MIDTKRAFT equipped the 150 MWe pulverised coal-fired Studstrup power station, unit 1, for a technology demonstration cofiring of coal and straw. The conversion consisted of establishing a straw pre-processing plant and modifying the burner system. After plant commissioning in January 1996, a 2-year demonstration program was initiated. The objective of the program was to evaluate the influence of cofiring on boiler plant performance, combustion chemistry, heat surface deposits and corrosion, residue quality, emissions, and selective catalytic reduction (SCR) systems. This paper presents the plant conversion and results from the demonstration period. 相似文献