摘要
高温矿井采用井下集中式制冷降温系统受采掘范围的影响,冷冻水输送管网复杂,导致末端冷量供给不足,严重影响系统降温效果。为提高矿井降温系统冷量利用率,以赵楼煤矿井下制冷降温管网为例,基于图论原理建立井下降温管网拓扑模型,采用水力基本方程计算管段流量、节点阻力和水力损失,得到降温管网水力特性;通过管网节点温升的计算,确定冷冻水输送过程的冷量损失;结合管网水力、热力特性,对降温管网进行优化。结果表明:赵楼煤矿井下制冷降温管网末端工作面冷冻水流量最小为0.001 m^(3)/s,管网水力损失大的位置为一集轨道下山、7302运输巷和中部辅运大巷。降温系统分别给五采区和七采区共4个工作面供冷,冷量损失为1.22×10^(6) J/s,其中七采区降温系统冷量损失占88.15%,管网摩擦和传热冷量损失分别为5.39×10^(5)、6.805×10^(5) J/s,末端冷冻水最高输水温度为13.9℃。提出管道-泵阀联调优化方法,采用动态平衡阀对南部1号辅助运输大巷和二集辅助巷冷冻水流量恒定在0.022~0.04 m^(3)/s,实现末端空冷器流量稳定;采用静态平衡阀调节管网支路阻力,将工作面冷冻水流量增大至0.005 m^(3)/s;南部1号辅助运输大巷、南部2号辅助运输大巷和二集辅助巷的管径增加至0.325 m,管网总水力损失从30.93 m减少到20.44 m,减少了35%;将离心泵扬程调整为183~195 m、流量为0.085~0.112 m^(3)/s,离心泵高效运行。
Adoption of centralized underground refrigeration cooling system in high-temperature mine is affected by the range of mining.The complex chilled water transmission pipeline network leads to inadequate supply of terminal cooling capacity,which significantly affects the cooling effectiveness.In order to improve the utilization of cooling capacity in mine cooling system,taken the underground refrigeration cooling pipe network of Zhaolou Coal Mine as an example.The topological model of cooling pipe network was established based on the principle of graph theory.The hydraulic basic equation was used to calculate the flow,nodal resistance and hydraulic losses of the pipe section to obtain the hydraulic characteristics of cooling pipe network.The cooling loss of chilled water transportation was determined by calculating the temperature rise of pipe network nodes.The cooling pipe network was optimized by combining the hydraulic and thermal characteristics of pipe network.The results shown that,the minimum chilled water flow was 0.001 m^(3)/s in the working face at the end of underground cooling pipe network in Zhaolou Coal Mine.The locations with significant hydraulic losses in the pipe network were A set of Track Downhill,7302 Transport Roadway and Central Auxiliary Transport Roadway.The system respectively supplied cooling to four working faces in the Fifth and Seventh mining areas.The total cooling loss was 1.219×10^(6) J/s,of which the cooling system in Seventh mining area accounted for 88.15%,the friction and heat transfer losses of pipe network is 5.39×10^(5) J/s and 6.805×10^(5) J/s,respectively,and the maximum temperature of chilled water at the end was 13.9℃.The optimization method of pipeline-pump-valve inter-conditioning was proposed,the dynamic balance valve was used to maintain the chilled water flow in the range of 0.022-0.04 m^(3)/s in the South 1#Auxiliary Transportation Roadway and the Second Set Auxiliary Roadway,to achieve the flow stability of the end air cooler.The static balance valve was used t
作者
马砺
张雅婷
刘尚明
简俊常
秦志华
刘恒
陈超扬
MA Li;ZHANG Yating;LIU Shangming;JIAN Junchang;QIN Zhihua;LIU Heng;CHEN Chaoyang(College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Zhaolou Coal Mine,Yanmei Heze Energy Chemical Co.,Ltd.,Heze 274705,China)
出处
《煤炭科学技术》
EI
CAS
CSCD
北大核心
2024年第2期150-158,共9页
Coal Science and Technology
基金
山东省重大科技创新工程资助项目(2019SZY020502)。
关键词
矿井降温
制冷降温管网
水力损失
冷量损失
mine cooling
refrigeration cooling pipe network
hydraulic loss
cold loss
