摘要
针对路基的冻胀现象,结合可再生能源利用技术,提出一种更具实时性和有效性的路基防冻胀方法,即路基主动供热方法。基于太阳能和浅层地热能的资源性条件,设计了分别采用这2种可再生能源作为热源的路基专用供热系统,制作了样品并进行了性能验证试验。结果表明:采用可再生能源作为热源的路基供热方法可在冬季主动向路基输入热量来实时防控由气候引起的过冷状态;太阳能真空管集热技术和地源热泵技术具有小型化、高效化等有利于路基应用的优势,冻土区丰富的太阳能资源和浅层地热能资源可以解决热源的分散供应问题。所设计的2种路基专用供热系统均为小型集成化系统,适合采用分布式"孤岛"运行方式,路基专用太阳能供热系统的日均供热温度可达20~40℃,路基专用地源热泵系统可以自动化提供30℃、45℃、60℃等不同水平的日均供热温度,均可满足路基防冻胀要求。可再生能源供热技术可以为解决冻土区路基防冻胀问题提供一种新途径。
To improve the frost heaving phenomenon of subgrade,combined with renewable energy utilization technology,a more timely and effective subgrade frost heaving prevention method is proposed,namely subgrade active heating method.Based on the resource conditions of solar energy and shallow geothermal energy,two kinds of the heating system for subgrade is designed,and the samples are manufactured and the performance verification test is carried out.The results show that subgrade heating method using renewable energy as heat source can compensate the heat loss of subgrade actively in winter to prevent and control the supercooling caused by climate in real time.Solar vacuum tube collector technology and ground-source heat pump technology have the advantages of miniaturization and high efficiency,which are conducive to the application of subgrade.The abundant solar energy resources and shallow geothermal energy resources in frozen soil region can solve the problem of decentralized supply for heat sources.The designed two kinds of heating systems for subgrade are small integrated systems,which are suitable for distributed"island"operation.The average daily heating temperature of the solar heating system for subgrade can reach 20~40℃,and the ground-source heat pump system for subgrade can automatically provide different levels of average daily heating temperature such as 30℃,45℃and 60℃,which can meet the requirements of frost heaving of subgrade.The renewable energy heating technology can provide a potential way to solve the frost heaving problem of subgrade in frozen soil region.
作者
胡田飞
Hu Tianfei(State Key Laboratory of Mechanical Behavior and System Safety of Traffic Engineering Structures,Shijiazhuang Tiedao University,Shijiazhuang 050043,China;School of Civil Engineering,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)
出处
《太阳能》
2021年第6期37-49,共13页
Solar Energy
基金
国家自然科学基金(42001059)
河北省高等学校科学技术研究项目(QN2020180)
河北省自然科学基金(E2020210044)。
关键词
路基
冻胀
可再生能源供热技术
冻土区
太阳能
地源热泵
供热温度
subgrade
frost heave
renewable energy heating technology
frozen soil region
solar energy
ground-source heat pump
heating temperature
