煤矿安全2024，Vol.55Issue(4)：66-71,6.DOI:10.13347/j.cnki.mkaq.20231536
采动裂隙缩径后端抽采气流中煤岩颗粒沉积规律研究
Study on deposition pattern of coal rock particles in the pumping gas flow at the back end of mining fissure shrinkage
王光雄 1杨英兵 2戴宇航 3马灵军 1问小江 3刘应科3
作者信息
- 1. 国能神东煤炭集团有限责任公司 通风研究中心,内蒙古 鄂尔多斯 017209
- 2. 国能神东煤炭集团有限责任公司 通风研究中心,内蒙古 鄂尔多斯 017209||中国矿业大学 安全工程学院,江苏 徐州 221116
- 3. 中国矿业大学 安全工程学院,江苏 徐州 221116
- 折叠
摘要
Abstract
Coal particles carried by the gas extraction flow are easy to be deposited in the mining-induced fracture,which seriously reduces the flow rate of gas extraction.Mastering the deposition characteristics of particles in the fracture is an important basis for improving the flow rate of gas extraction.In this paper,we carried out a particle transport and deposition experiment in the fracture with a shrinkage,and studied the particle deposition bed evolution law after crossing the shrinkage under the influence of the gas ex-traction flow.In addition,we analyzed the influence of the gas velocity and shrinkage structure parameter on the particle deposition law of the back end of the shrinkage of the fracture and the local resistance of the gas flow.The results show that the granular sedi-mentary bed at the back end of the fracture shrinkage shows two kinds of evolution patterns.When the particle deposition bed is dis-tributed in a"V"shape along the airflow direction,the deposition height of the granular deposition bed shows an evolution pattern of rapid increase followed by a slow decrease.When the depositional zone is a"Ʌ"shaped deposition along the direction of flow,the depositional height shows an evolutionary pattern of slow increase and then slow decrease.In addition,with the development of the particle bed in the fracture,the local resistance changes at the back end of the fracture shrinkage can be divided into the initial sta-bilization stage,the rapid development stage and the final stabilization stage.The evolution time of the initial stabilization stage is shortened with the increase of the pumping rate or the decrease of the shrinkage ratio.The evolution time of the rapid development stage is shortened with the increase of the pumping rate or the increase of the shrinkage ratio.关键词
瓦斯抽采/采动裂隙/裂隙缩径/颗粒沉积/气固两相流Key words
gas extraction/mining-induced fracture/fracture shrinkage/particle deposition/gas-solid two-phase flow分类
矿业与冶金引用本文复制引用
王光雄,杨英兵,戴宇航,马灵军,问小江,刘应科..采动裂隙缩径后端抽采气流中煤岩颗粒沉积规律研究[J].煤矿安全,2024,55(4):66-71,6.
