沥青搅拌设备燃气燃烧器配风系统的研究

发布时间：2018-07-01 12:21

本文选题：沥青搅拌设备 + 燃气燃烧器　；参考：《长安大学》2017年硕士论文

【摘要】：主燃烧器是沥青混合料搅拌设备的关键总成,最主要的热量输入总成。它将燃料的化学能转化为热能,将冷骨料烘干加热至适宜的温度,为骨料与填料,沥青的进一步拌合做好准备。燃烧器的稳定性,燃烧效率及排放的优劣,直接决定了搅拌设备的生产质量,生产效率,能源消耗水平以及环保水平的高低。随着我国对环保日益重视,各行业对环境保护,节能减排都提出了更高的要求。天然气较传统的燃煤,燃油等燃料在环保性,便利性上都具有明显优势,因此在搅拌领域,天然气燃烧器近年来得到了越来越广泛的应用。本文以沥青搅拌设备天然气主燃烧器为研究对象,在分析了其燃烧方式,稳焰机理及稳焰方法的基础上,主要对其配风形式的分类及特点,配风器主要参数及其对火焰的影响情况进行了论述。以上述理论分析为依据,设计了相关试验方案,并在此基础上进行了实验室试验和工地现场试验。试验结果表明:(1)平流式配风器的主要特征参数中,旋流强度和配风器本身的几何尺寸有关。阻力系数、一次风系数和燃烧器的其他尺寸也有关系。旋流强度越大,火焰越稳定。阻力系数越小,同风机同开度的条件下风量越大。(2)斜锥钝体与旋流板的组合会使火焰在喉口处受到气流的挤压,使火焰变细,火焰的刚度增强,同时喉口处的气流会对燃烧室内喷嘴的气流起到压缩作用,增大其喷射角。(3)在配风系统相同的情况下,风机开度加大会使火焰的旋转更加强烈;同时,大直径、高旋流强度的旋流板会使燃烧器喉口处受到气流的挤压,使火焰变细,刚性增强。(4)在旋流式燃烧器的喷口处,燃料和气流即发生强烈的混合,使得燃烧完全充分,产生短粗型火焰。其热效率相较于无外圈旋流叶片的,中心旋流板外径相同的平流式燃烧器更高。
[Abstract]:The main burner is the key assembly of asphalt mixture mixing equipment, the most important heat input assembly. It converts the chemical energy of fuel into heat energy and heats the cold aggregate to a suitable temperature to prepare for the further mixing of aggregate and filler and asphalt. The stability, combustion efficiency and emission of the burner directly determine the production quality, production efficiency, energy consumption level and environmental protection level of the mixing equipment. With the increasing attention to environmental protection in China, all industries put forward higher requirements for environmental protection, energy conservation and emission reduction. Natural gas has obvious advantages in environmental protection and convenience compared with traditional fuels such as coal burning and fuel etc. Therefore natural gas burners have been more and more widely used in the field of agitation in recent years. In this paper, the natural gas main burner of asphalt mixing equipment is taken as the research object. On the basis of analyzing its combustion mode, flame stabilization mechanism and flame stabilization method, the classification and characteristics of its air distribution form are mainly discussed. The main parameters of air distributor and its influence on flame are discussed. Based on the above theoretical analysis, the related test schemes are designed, and the laboratory tests and site tests are carried out. The experimental results show that: (1) among the main characteristic parameters of the advection air distributor, the swirl intensity is related to the geometric size of the distributor itself. The drag coefficient, primary air coefficient and other dimensions of the burner are also related. The greater the swirl intensity, the more stable the flame. The smaller the resistance coefficient, the greater the air volume under the condition of the same opening of the fan. (2) the combination of oblique cone blunt body and swirl plate will make the flame be squeezed by the airflow at the throat, make the flame thin, and the flame stiffness will be enhanced. At the same time, the airflow at the throat will compress the air flow of the nozzle in the combustion chamber, and increase the injection angle. (3) under the same air distribution system, the greater the opening of the fan will make the flame rotate more intensively; at the same time, the large diameter, The swirl plate with high swirl intensity will make the nozzle of the burner be squeezed by the air flow, make the flame finer and increase the rigidity. (4) at the nozzle of the swirl burner, the fuel and the air flow will be strongly mixed, so that the combustion is completely adequate. A short thick flame is produced. Its thermal efficiency is higher than the advection burner with the same outer diameter of the central swirl plate compared with the swirl blade without outer ring.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U415.522

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