工程科学学报2016，Vol.38Issue(8)：1050-1058,9.DOI:10.13374/j.issn2095-9389.2016.08.002
联络巷对采空区氧化升温带影响的多场耦合模拟研究
Multi-field coupling numerical simulation of the crossheading effect on oxidization and heat accumulation zones in gob areas
摘要
Abstract
Under the ventilation condition of U+L, a crossheading has important impact on spontaneous combustion of residual coal in a gob area. In order to ensure mine safety and obtain parameters to prevent spontaneous combustion of residual coal, on the basis of the mechanism of coal oxidation and using UDF to incorporate the reaction mechanism into FLUENT, multi-field coupling numerical simulation was performed to study the distribution law of the oxidization and heat accumulation zone in a gob with a cross-heading. The results show that the air flow field, oxygen concentration field and temperature field all change when the crossheading exists, the oxidization and heat accumulation zone not only offsets to the return-side but also becomes deeper and wider. The distance between the crossheading and working surface affects the width of the oxidization and heat accumulation zone, and when it is 20 m, the maximum width is approximately 25 m. After 10 d of reaction, the heating rate at the high temperature point can reach 1. 24 K·d-1 in the U+L ventilation system, which is 1. 5 times that in the U ventilation system. However, the position of the crossheading has little effect on the high temperature point. The temperature nearby the crossheading is the highest in the return-side temperature field of the U+L ventilation system, and the average temperature is 4 K higher than the same location temperature in the U system per day. With increasing distance from the crossheading to working face, the heating rate in the crossheading rim increases from 0. 1 K·d-1 to 0. 9 K·d-1 . Although the crossheading does not belong to the high temperature region in the whole temperature field, it has good warming potential.关键词
联络巷/采空区/氧化/升温/数值模拟Key words
crossheading/gob areas/oxidization/temperature rise/numerical simulation分类
矿业与冶金引用本文复制引用
张英华,周佩玲,黄志安,高玉坤,袁飞..联络巷对采空区氧化升温带影响的多场耦合模拟研究[J].工程科学学报,2016,38(8):1050-1058,9.基金项目
国家自然科学基金资助项目(51474017) （51474017）
