LB2000型沥青拌和设备燃油改燃煤的技术改造

介绍了笔者公司LB2000型沥青拌和设备进“行油改煤”改造的情况,分析了其工作原理,并在改造后与燃油进行比较,结果表明其具有可观的经济效益。     

对百得75型燃烧器的分析和改进

介绍了意大利百得75型燃烧器控制系统的工作原理,分析了系统的改进方法,并说明了电气原理,从而降低使用成本,提高系统的可靠性.     

文丘利型油燃烧器出口气液两相流动与燃烧的数值模拟

针对选配文丘利型油燃烧器的燃油锅炉中液雾燃烧的特点，在冷态等温流场数值模拟结果及 EBU-Arrhenius模型模拟气相燃烧所得结果的基础上，数值模拟了单只文丘利油燃烧器出口的气液两相 流动与燃烧，给出了流场中的速度场、温度场以及浓度场的分布信息，这些结论可为该型燃油锅炉的进 一步设计和运行以及燃烧室的布置提供有益的依据。     

平板湍流边界层流向—法向平面发卡涡的PIV实验研究

湍流边界层流动精细涡结构的分析对于水下航行体表面减阻乃至降噪机理的深入研究都具有重要意义.文章应用粒子图像测速技术(PIV),对Reθ=1 743和5 400时的平板湍流边界层的流向—法向平面流场进行了测试研究.一方面,直接对瞬时速度场精细涡结构进行提取分析,通过Galilean分解和λci准则识别出流向—法向平面中的发卡涡及发卡涡包.研究表明,发卡涡和雷诺应力的分布特征具有高度相关性;发卡涡包产生了流向动量的法向不规则分层分布特征.另一方面,文中通过对500个瞬时速度场子样进行时间平均分析,获得了不同雷诺数下平均速度以及湍流度分量的法向分布规律.此外,文中还对发卡涡的几何尺寸和漩涡强度λci进行了统计分析.研究表明,在y+＜50范围内无量纲化的漩涡强度λciδ/uт沿法向迅速衰减,且在不同雷诺数下变化曲线基本一致;在y+ ＞50后λciδ/uт衰减平缓,且低雷诺数下的值较大.     

沥青拌和设备燃烧器如何良好使用重渣油的研究

通过对多家沥青拌和设备所使用的燃烧器的监测,研究了目前应用于沥青拌和设备的燃烧器在使用重渣油代替柴油时所遇到燃油难以正常雾化、燃烧,影响燃烧器正常使用的问题,最终得出沥青拌和设备在使用专用燃烧机,并对燃料供给系统进行良好设计和维护下,便可极大地提高重渣油利用效率的结论。     

Experimental study on flow structure of a swirling non-premixed syngas flame

The development of integrated gasification combined cycle（IGCC） systems provides cost-effective and environmentally sound options for meeting the future coal-utilizing power generation needs in the world.The combustion of gasified coal fuel significantly influences overall performance of IGCC power generation.Experiments are performed to investigate the characteristics of syngas swirling flame using the particle image velocimetry （PIV） in this paper.With the increase of CO/H₂ molar ratio,the distance between the nozzle and the fuel vortex in flame increases at first,and then reduces slowly;maximum of the axial mean velocity increases continuously, but the axial mean velocity peaks on the side of centerline change little.The experiment indicates that with the increase of fuel to air velocity ratio,the fuel vortex grows up at first,and then becomes thinner;the distance from the fuel vortex to the nozzle reduces at first,and then increases;inner boundary of the recirculating zone increases. Furthermore,difference between the methane swirling flow field and the syngas swirling one is analyzed in this paper.It can establish the benchmarks for the development and validation of combustion numerical simulation by the data from this experiment.     

Flow Past an Accumulator Unit of an Underwater Energy Storage System:Three Touching Balloons in a Floral Configuration

An LES simulation of flow over an accumulator unit of an underwater compressed air energy storage facility was conducted. The accumulator unit consists of three touching underwater balloons arranged in a floral configuration. The structure of the flow was examined via three dimensional iso surfaces of the Q criterion. Vortical cores were observed on the leeward surface of the balloons. The swirling tube flows generated by these vortical cores were depicted through three dimensional path lines. The flow dynamics were visualized via time series snapshots of two dimensional vorticity contours perpendicular to the flow direction; revealing the turbulent swinging motions of the aforementioned shedding-swirling tube flows. The time history of the hydrodynamic loading was presented in terms of lift and drag coefficients. Drag coefficient of each individual balloon in the floral configuration was smaller than that of a single balloon. It was found that the total drag coefficient of the floral unit of three touching balloons, i.e. summation of the drag coefficients of the balloons, is not too much larger than that of a single balloon whereas it provides three times the storage capacity. In addition to its practical significance in designing appropriate foundation and supports, the instantaneous hydrodynamic loading was used to determine the frequency of the turbulent swirling-swinging motions of the shedding vortex tubes; the Strouhal number was found to be larger than that of a single sphere at the same Reynolds number.     

气体燃料在沥青拌和站中的应用

从燃烧设备的投资成本、燃料消耗使用成本、节能环保性和燃料对沥青拌和站整体的使用影响等方面．对搅拌设备使用气体燃料和液体燃料的状况进行对比分析,得出了使用气体燃料具有经济、环保等优点的结论．可为沥青搅拌站的燃料选择提供参考。     

常规燃烧器与数控重渣油燃烧机

简要介绍了常规燃烧器及数控重渣油燃烧机,分析了常规燃烧器燃烧重渣油存在的问题,以及ZZR系列数控燃烧机的特点,认为ZZR数控重渣油燃烧机是燃烧重渣油的理想设备.     

文丘利油燃烧器内外部流场的冷热态数值模拟

针对文丘利油燃烧器的特殊结构和内外部流动燃烧的特点,成功地建立了能有效准确地描述其内外部流动燃烧的数学物理模型,并对其内外部的冷热态流场进行了大量的数值模拟研究,数值模拟结果与试验数据和有关的流动燃烧理论在定量和定性上吻合得很好,可为该型油燃烧器的改进、运行以及布置提供有价值的依据.