沥青混合料烟气富集方法与释放规律分析  

An Analysis on Fume Enrichment Method and Release Rule for Asphalt Mixture

作　　者：念腾飞 李竞高 李萍[1] 李树旺 陈修乐 NIAN Teng-fei;LI Jing-gao;LI Ping;LI Shu-wang;CHEN Xiu-le(School of Civil Engineering,Lanzhou University of Technology,Lanzhou,Gansu 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050

出　　处：《公路交通科技》2024年第2期11-21,共11页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(52368066);甘肃省自然科学基金项目(23JRRA773);甘肃省高等学校创新基金项目(2022A-026);兰州理工大学红柳优秀青年人才支持计划项目(04-062005)。

摘　　要：针对拌和站沥青混合料烟气无序排放和治理效果不佳,给自然环境及人体健康造成巨大的危害,以质量法为基础,自行设计组装符合沥青混合料厂拌状态的沥青烟气产生-富集装置,开展了沥青混合料拌和时烟气释放规律的研究。选取4种石油沥青,考虑现场拌和站沥青烟气的产生条件,将拌和温度、骨料比表面积及拌和频率确定为影响烟气释放的关键因素,采用实测修正的比表面积计算方法对集料的暴露面积进行计算,分析了各关键因素对厂拌沥青混合料烟气释放量的影响。结果表明:自行设计组装的烟气生成-富集装置具有良好的稳定性,能够保证实验结果的准确性;不同拌和工况下烟气中轻组分的量级远低于重组分,基质沥青经SBS改性后的烟气释放量有所减少;拌和温度是决定烟气释放量最关键的因素,烟气释放量伴随着温度的上升呈现出明显的增长趋势,沥青产烟具有较强的温度敏感性,不同拌和温度下烟气释放量差异显著,160℃及170℃是烟气释放量的跃升节点;沥青混合料的产烟量与骨料的比表面积成正比,骨料的比表面积通过决定沥青的暴露面积直接影响到烟气的释放量;烟气释放量与拌和频率正相关,相较于烟气重组分,烟气轻组分的释放量受到拌和频率的影响较小。研究结果可为拌和站烟气的释放与处置提供理论与技术支撑。The disorderly emission and poor treatment effect of asphalt mixture fume in asphalt mixing stations have caused huge harm to the natural environment and human health.Based on the mass method,the fume generation-enrichment device is self-designed and assembled,which is suitable for the mixing state of asphalt mixture plant,and the study on the fume release rules during asphalt mixture mixing is carried out.4 kinds of petroleum asphalt are selected,and considering the conditions of asphalt fume generation in the field mixing station,the mixing temperature,aggregate specific surface area and mixing frequency are determined as the key factors affecting the fumer release.The exposed area of the aggregate is calculated by the measured modified specific surface area calculation method,and the influence of each key factor on the smoke release of the plant-mixed asphalt mixture is analyzed.The result shows that(1)the self-designed and assembled fume generation-enrichment device has good stability and can ensure the accuracy of the experimental results;(2)the magnitude of the light components in the fume under different mixing conditions is much lower than that of the heavy components,and the fume release after the base asphalt modified by SBS is reduced;(3)mixing temperature is the most critical factor that determines the amount of fume release,the amount of fume release shows an obvious growth trend with the increase in temperature,fume production has strong temperature sensitivity,release varies significantly under different mixing temperatures,and 160℃ and 170℃ are the jumping nodes of fume release;(4)the amount of fume produced by the asphalt mixture is directly proportional to the specific surface area of the aggregate,and the specific surface area of the aggregate directly affects the amount of fume released by determining the exposed area of asphalt;(5)the amount of fume release is positively related to the mixing frequency,compared with the heavy components of the fume,the release amount of the light componen

关 键 词：道路工程 环保 富集装置 质量法 沥青烟气 烟气释放规律 

分 类 号：U416.217[交通运输工程—道路与铁道工程]