氯化物盐作为光热发电(concentrating solar power,CSP)传储热介质,可以显著提升其发电效率、降低发电成本。然而,氯化物熔盐对结构材料具有强烈的腐蚀性,限制了它的应用,因此开发耐氯化物熔盐腐蚀合金及涂层材料显得尤为重要。通过研究...氯化物盐作为光热发电(concentrating solar power,CSP)传储热介质,可以显著提升其发电效率、降低发电成本。然而,氯化物熔盐对结构材料具有强烈的腐蚀性,限制了它的应用,因此开发耐氯化物熔盐腐蚀合金及涂层材料显得尤为重要。通过研究310S钢在高温氯化物熔盐中的腐蚀行为及腐蚀动力学,可以揭示其在氯化熔盐中的失效机制;同时利用包埋渗铝技术在其表面制备Fe-Al涂层,并采用扫描电子显微镜(scanning electron microscope,SEM)、X射线衍射仪(X-ray diffraction,XRD)、能谱仪(energy dispersive spectroscopy,EDS)等表征方法,研究不同腐蚀时间对310S钢微观组织、物相组成的影响,以及Fe-Al涂层在氯化物熔盐中的耐腐蚀性能。结果表明,310S钢在高温氯化物熔盐中,其质量损失和腐蚀速率均随着腐蚀时间的延长而增大,腐蚀300 h时腐蚀速率达到最大,约为5852.72μm/a,此时,2 mm厚的钢板被腐蚀穿透。腐蚀400 h,腐蚀速率稍有降低,但基体内部灌入大量熔盐从内部腐蚀,钢基体腐蚀失效。Fe-Al涂层在高温氯化熔盐中腐蚀400 h,表面形成厚度约为40μm的氧化层,并呈多层结构,从外到内依次为MgO、Mg(Al,Cr)_(2)O_(4)、Al_(2)O_(3),内层的Al_(2)O_(3)层连续致密,且与涂层结合牢固,起到主要防护作用;其腐蚀速率约为264μm/a,为未渗铝钢同等条件下腐蚀速率(5713μm/a)的1/22,显著提升了310S钢的耐氯化熔盐腐蚀性能。分析表明,310S钢在高温氯化物熔盐中基本没有抵抗腐蚀的能力,但通过包埋渗铝技术在其表面制备Fe-Al防护涂层,可有效提升其耐氯化物熔盐腐蚀性能,使其作为结构材料在下一代CSP储热装置中的应用成为可能。展开更多
A systematic analysis is performed to assess the current situation of transportation and tourism integration in 20 districts and counties located along National Highway 310(Gansu-Qinghai section),and optimization stra...A systematic analysis is performed to assess the current situation of transportation and tourism integration in 20 districts and counties located along National Highway 310(Gansu-Qinghai section),and optimization strategies are explored based on the findings of this analysis.The findings indicate a pressing necessity for further improvement in the practice of transportation and tourism integration in both Gansu and Qinghai provinces.Based on this foundation,a development framework for transportation and tourism integration has been established.This framework simulates a“fast-forward-slow-travel”system in which tourists commence their journey from the origin,traverse through core,secondary,and subsidiary tourist destinations,and ultimately reach the core,secondary,and subsidiary attractions.Furthermore,this study presents optimization recommendations for the integrated development of regional transportation and tourism along the designated route.These suggestions encompass the establishment and optimization of facilities and service points,the planning and design of tourism routes,the promotion of regional synergistic development,the construction of intelligent tourism,and the implementation of green tourism pathways.展开更多
文摘A systematic analysis is performed to assess the current situation of transportation and tourism integration in 20 districts and counties located along National Highway 310(Gansu-Qinghai section),and optimization strategies are explored based on the findings of this analysis.The findings indicate a pressing necessity for further improvement in the practice of transportation and tourism integration in both Gansu and Qinghai provinces.Based on this foundation,a development framework for transportation and tourism integration has been established.This framework simulates a“fast-forward-slow-travel”system in which tourists commence their journey from the origin,traverse through core,secondary,and subsidiary tourist destinations,and ultimately reach the core,secondary,and subsidiary attractions.Furthermore,this study presents optimization recommendations for the integrated development of regional transportation and tourism along the designated route.These suggestions encompass the establishment and optimization of facilities and service points,the planning and design of tourism routes,the promotion of regional synergistic development,the construction of intelligent tourism,and the implementation of green tourism pathways.
