沥青路面红外热风复合式加热效果数值计算分析

Numerical simulation analysis on heating effects of asphalt pavement by infrared and hot air compounding heating

为了改善路面加热质量和效率,提出了一种红外热风复合式加热新方法.基于传热学和有限元理论,建立了沥青路面平面温度场有限元模型,对路面的加热过程进行数值模拟研究,对比分析了沥青路面红外加热法、热风加热法和红外热风复合式加热法的加热效果.研究结果表明:从沥青路面内部对其进行加热明显提高了路面的加热效率,在同等要求条件下,红外热风复合式加热的加热时间比红外辐射加热缩短了21.5%,比热风加热缩短了43.4%.将热风引入路面内部并对其进行加热,明显提高了热能传递效率,改善了层间温度梯度大等问题.红外热风复合式加热法具有加热均匀性好、加热效果好、效率高和可达软化深度深等优点,保证了再生混合料质量和路面热再生质量.

Infrared and hot air compounding heating which is a new approach to asphalt pavement heating was carried out to improve the heating quality and efficiency.The finite element model of asphalt pavement planar thermal field was developed to simulate the heating process of asphalt pavement based on the heat transfer and finite element theory.The heating effects of asphalt pavement during infrared heating method,hot air heating method and infrared-hot air compounding heating method were analyzed.The results indicate that the heating efficiency of the asphalt pavement is improved obviously by heating the asphalt pavement from inside.The heating time of infrared and hot air compounding heating is 21.5%shorter than that of infrared radiation heating and 43.4%shorter than that of hot air heating under the same conditions.The heat transfer efficiency and the large temperature gradient between layers are improved obviously by introducing hot air into asphalt pavement.The infrared and hot air compounding heating method has the advantages of uniform heating effect,high efficiency and deep soften depth,which improves the quality of the recycled mixture and hot in-place recycling of asphalt pavement.