| 引用本文: | 马登成,刘壮壮,刘双鹤.微波-热风混合加热沥青路面回收料仿真分析[J].哈尔滨工业大学学报,2024,56(12):143.DOI:10.11918/202309046 |
| MA Dengcheng,LIU Zhuangzhuang,LIU Shuanghe.Simulation analysis of microwave-low temperature hot air mixed heating for reclaimed asphalt pavement[J].Journal of Harbin Institute of Technology,2024,56(12):143.DOI:10.11918/202309046 |
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| 摘要: |
| 为提高沥青路面回收料（RAP）的加热质量和效率,降低微波加热装机功率,促进超大功率微波在热再生设备中的应用,提出了微波-热风混合加热方法。通过对微波、热风及微波-低温热风混合加热有限元分析,证明了微波-低温热风混合加热相比于单独加热更具有优势。分析了微波热风混合加热过程,对多馈口微波热风混合加热腔及天线进行设计,以此为基础构建了混合加热有限元模型。对不同加热高度、热风温度、热风风速等对混合加热效果的影响因素进行仿真分析,对比分析了RAP在微波加热、热风加热和微波热风混合加热的加热效果。结果表明:RAP加热高度会导致混合加热腔内微波发生干涉,对加热效果产生较大影响。风温过高会导致RAP表面迅速出现烤焦老化。加热距离为50、100 mm时,混合加热较微波单独加热,加热效率分别提高9.32%、11.75%；较热风单独加热,RAP上表面的加热效率分别提高了124.7%,92.9%,下表面的加热效率分别提高了38.8%、34.8%,同时均匀性都得到不同程度提高。说明微波热风混合加热能够明显提高RAP的加热效率,改善微波单独加热效率不高和均匀性差的问题,兼顾两者优点,保证了RAP的加热质量,为RAP的再生加热提供了新的方法。 |
| 关键词: 沥青路面回收料（RAP） 微波-热风 混合加热 电磁场 温度场 数值模拟 |
| DOI：10.11918/202309046 |
| 分类号:U416.26；U418.6+7 |
| 文献标识码:A |
| 基金项目:陕西省自然科学基金面上项目(2024JC-YBMS-413) |
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| Simulation analysis of microwave-low temperature hot air mixed heating for reclaimed asphalt pavement |
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MA Dengcheng,LIU Zhuangzhuang,LIU Shuanghe
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(National Engineering Research Center of Highway Maintenance Equipment (Chang’an University), Xi’an 710064, China)
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| Abstract: |
| To improve the heating quality and efficiency of reclaimed asphalt pavement (RAP), reduce the installed power of microwave heating, and promote the application of ultra-high power microwave in hot recycling equipment, a microwave-hot air mixed heating method was proposed. Finite element analysis of microwave, hot air and microwave-low temperature hot air mixed heating demonstrated the advantages of microwave-low temperature hot air mixed heating over separate heating. The microwave-hot air hybrid heating process was analyzed, the multi-feeder microwave-hot air mixed heating chamber and antenna were designed, and the mixed heating finite element model was constructed on this basis. Factors affecting the mixing heating effect were simulated and analyzed, such as different heating heights, hot air temperatures, and hot air velocities. The heating effects of RAP in microwave heating, hot air heating and microwave-hot air mixed heating were compared and analyzed. The results show that the heating height of RAP can cause microwave interference in the mixed heating chamber and significantly affect the heating effect. Excessively high air temperature can lead to rapid surface scorching and aging of RAP. At heating distance of 50 mm and 100 mm, hybrid heating outperforms microwave or hot air heating alone, with efficiency improvements of 9.32% and 11.75%, respectively, compared to microwave heating, and surface heating efficiency enhancements of 124.7% and 92.9%, and underside heating efficiency improvements of 38.8% and 34.8%, respectively, compared to hot air heating. Additionally, uniformity is improved to varying degrees. This indicates that microwave-hot air mixed heating can significantly improve the heating efficiency of RAP, addressing the problems of low heating efficiency and poor uniformity of microwave heating alone. By combining the strengths of both methods, this approach ensures the heating quality of RAP, and provides a new method for the regeneration heating of RAP. |
| Key words: reclaimed asphalt pavement(RAP) microwave-low temperature hot air mixed heating electromagnetic field temperature field numerical simulation |
