Affiliation:
1. Security Academy Henan Polytechnic University Jiaozuo China
2. Gas Disaster Prediction and Prevention Engineering Research Center of Coal Mine Disaster Prevention and Rescue Ministry of Education Jiaozuo China
3. Collaborative Innovation Center for Coal Safety Production and Clean and Efficient Utilization Jiaozuo China
Abstract
AbstractCurrently, the heat generated during coal core tube sampling causes rapid gas desorption, leading to substantial measurement errors in laboratory gas content assessments. Reducing these errors requires studying frictional heat from core tube friction against the hole wall and coal core temperature rise. Combining the independently developed device to simulate the thermal effect of coring and the COMSOL finite element analysis software, the intensity of the frictional heat source during the core tube sampling and drilling process was analyzed under different coring depth and rotational speed conditions. The research results show that: At constant speed, frictional heat intensifies as the core depth increases. However, the rate of temperature rise decreases with increasing core depth; when the coring depth is constant, the frictional heat is proportional to the rotational speed. For example, at a depth of 140 m and a rotational speed of 120 r/min, the intensity of frictional heat generated by drilling is 2.21 ∗ 10E6J. Similarly, at 180 r/min, the strength is 2.28 ∗ 10E6J, and at 240 r/min, the strength reaches 3.65 ∗ 10E6J; Under certain conditions, core tube wall temperature will not rise indefinitely but will stabilize to a certain value.
Funder
National Natural Science Foundation of China
Subject
General Energy,Safety, Risk, Reliability and Quality