摘要
针对地道风系统对空气冷却处理,介绍地层原始温度的计算方法,阐述日连续运行方式、日间歇运行方式混凝土埋地风管出口空气温度数学模型。对埋地风管出口空气温度、空气温降的影响因素(包括埋地风管中心埋深、运行方式、埋地风管长度)进行计算分析。随着埋地风管中心埋深的增大,空气温降先增大后减小,存在最佳中心埋深。运行方式选取日连续运行方式(全天24 h运行)、日间歇运行方式1(每日运行8 h)、日间歇运行方式2(每日运行16 h),3种运行方式的运行日均为30 d。3种运行方式的埋地风管出口空气温度均随着运行时间的延长而上升。日间歇运行方式1的埋地风管出口温度最低,日间歇运行方式2居中,日连续运行方式最高。与日连续运行方式相比,日间歇运行有利于土壤温度的恢复。对于日间歇运行方式,短时间运行更有利于土壤温度的恢复。空气温降随埋地风管的长度增大而增大,当埋地风管达到一定长度后空气温降的增幅不再明显,埋地风管存在合理长度。
For the air pre-cooling condition of the tunnel air system,the calculation method of the original temperature of the stratum is introduced,and the mathematical model of air temperature at the outlet of the concrete buried air duct in daily continuous operation mode and daily intermittent operation mode is described. The influencing factors of the air temperature and air temperature drop at the outlet of the buried air duct (including the buried air duct center depth,the operation mode and the length of the buried air duct) are calculated and analyzed. With the increase of the buried duct center depth,the air temperature drop increases first and then decreases,there is the best center depth. The operation modes include the daily continuous operation mode (24 hours all day),the daily intermittent operation mode 1 (8 hours every day) and the daily intermittent operation mode 2 (16 hours every day),and the operation days of the three operation modes are all 30 d. The air temperature at the outlet of the buried air duct in the three operation modes increases with the extension of the operation time. The air temperature at the outlet of the buried air duct in the daily intermittent operation mode 1 is the lowest,the daily intermittent operation mode 2 is the middle,and the daily continuous operation mode is the highest. Compared with the daily continuous operation mode,the daily intermittent operation is conducive to the recovery of soil temperature. For the daily intermittent operation mode,short-term operation is more conducive to the recovery of soil temperature. The air temperature drop increases with the increase of the length of the buried air duct. When the buried air duct reaches a certain length,the amplification of the air temperature drop is no longer obvious,and the buried air duct has a reasonable length.
作者
杨晓宇
张山
刘斯佳
张玲玲
YANG Xiaoyu;ZHANG Shan;LIU Sijia;ZHANG Lingling
出处
《煤气与热力》
2019年第5期17-20,10042,共5页
Gas & Heat
关键词
地道风系统
空气冷却
中心埋深
运行方式
埋地风管长度
tunnel air system
air pre-cooling
center depth
operation mode
length of buried air duct
