共查询到20条相似文献,搜索用时 93 毫秒
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1 前言研究表明 ,大气中的二氧化碳 (CO2 )浓度在以每年0 5 %的速度增加 ,地表温度随二氧化碳 (CO2 )浓度增加而逐年上升 ,这将引起冰山的融化 ,海平面升高 ,危害极大。所以世界范围内控制温室气体 (CO2 )的排放量已愈来愈受到重视。燃料燃烧过程是产生二氧化碳的主要来源 ,而燃烧生物质燃料 (森林、农业等的副产品 )产生的二氧化碳被植物所吸收利用 ,合成新的生物燃料 ,因此有二氧化碳零排放的美称。再加上每年都有大量的森林、农业的副产品 (秸杆、树枝等 )被白白地烧掉 ,浪费了大量的资源。研制高效的燃生物质燃料锅炉 ,不仅是发… 相似文献
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煤的挥发份组分对NOx和SOx排放的影响 总被引:5,自引:1,他引:5
在煤的燃烧过程中,NOX和SOX的形成大部分来源于挥发份的燃烧。对于不同的煤种,其挥发份的含量和组分是不同的。本文专门研究了煤的挥发份在富氧燃烧条件下,不同挥发份组分对NOX和SOX形成与排放的影响。通过基于化学反应动力学机理的模型计算发现,在不同组分的挥发份燃烧过程中,NOX和SOX的形成规律相似,但在煤的含氮量和含硫量相同的条件下,NOX和SOX的排放量受挥发份组分的影响较大,其排放量与燃料的 相似文献
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由成对的高性能高速燃烧器构成的使用420℃预热空气的互补型燃气受控脉动燃烧技术在陶瓷烧成窑上的试用,表明它是一种节能,低CO、低NOX排放量的燃烧技术,并介绍了该技术的发展过程和运行机理。 相似文献
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生物质能发电技术分析 总被引:5,自引:0,他引:5
在不可再生能源濒临枯竭,环境污染日益加剧的今天,生物质能源替代化石能源利用的研究和开发,已成为国内外学者研究和关注的热点。介绍了国内外生物质能的主要转化利用技术,分析了生物质直接燃烧发电技术和气化发电技术,提出了符合能量梯级利用原则的生物质能发电方式,将是生物质能利用的主要形式。 相似文献
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As a renewable and environmentally friendly energy source, biomass (i.e., any organic non-fossil fuel) and its utilization are gaining an increasingly important role worldwide. Grate-firing is one of the main competing technologies in biomass combustion for heat and power production, because it can fire a wide range of fuels of varying moisture content, and requires less fuel preparation and handling. The basic objective of this paper is to review the state-of-the-art knowledge on grate-fired boilers burning biomass: the key elements in the firing system and the development, the important combustion mechanism, the recent breakthrough in the technology, the most pressing issues, the current research and development activities, and the critical future problems to be resolved. The grate assembly (the most characteristic element in grate-fired boilers), the key combustion mechanism in the fuel bed on the grate, and the advanced secondary air supply (a real breakthrough in this technology) are highlighted for grate-firing systems. Amongst all the issues or problems associated with grate-fired boilers burning biomass, primary pollutant formation and control, deposition formation and corrosion, modelling and computational fluid dynamics (CFD) simulations are discussed in detail. The literature survey and discussions are primarily pertaining to grate-fired boilers burning biomass, though these issues are more or less general. Other technologies (e.g., fluidized bed combustion or suspension combustion) are also mentioned or discussed, to some extent, mainly for comparison and to better illustrate the special characteristics of grate-firing of biomass. Based on these, some critical problems, which may not be sufficiently resolved by the existing efforts and have to be addressed by future research and development, are outlined. 相似文献
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生物质直接燃烧技术的发展研究 总被引:20,自引:4,他引:20
随着能源危机和环境问题的日益严重,人们不断致力于开发研究低污染、可再生的新能源。在众多的可再生能源中,生物质能是一种储量丰富、清洁方便的绿色可再生能源,具有极大的开发潜力。为了大力开发利用生物质资源,分析比较了国内外生物质直接燃烧技术发展现状,提出应根据生物质燃料的燃烧特性,开发相应的燃烧技术和燃烧设备,以实现生物质资源的大规模集中高效利用。 相似文献
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《Refocus》2002,3(3):52-57
Biomass, the oldest ‘new and renewable’ source of energy currently provides about 12% of the world's total energy supply. This is predominantly in the form of combustion for use in domestic cooking or heating. There are strong economic, environmental and social drivers to move away from traditional biomass combustion to advanced thermochemical biomass conversion technologies. Peter Fardy, First Renewables UK Ltd provides an overview of the latest developments in this emerging area. 相似文献
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M. Balat 《Energy Sources, Part A: Recovery, Utilization, and Environmental Effects》2013,35(7):636-648
Abstract Gasification as a thermochemical process is defined and limited to combustion and pyrolysis. The gasification of biomass is a thermal treatment which results in a high proportion of gaseous products and small quantities of char (solid product) and ash. Biomass gasification technologies have historically been based upon partial oxidation or partial combustion principles, resulting in the production of a hot, dirty, low Btu gas that must be directly ducted into boilers or dryers. In addition to limiting applications and often compounding environmental problems, these technologies are an inefficient source of usable energy. The main objective of the present study is to investigate gasification mechanisms of biomass structural constituents. Complete gasification of biomass involves several sequential and parallel reactions. Most of these reactions are endothermic and must be balanced by partial combustion of gas or an external heat source. 相似文献