摘要
为保证耦合压力交换装置的矿井降温系统的降温效果,建立了压力交换缸内冷热水混合的计算流体力学仿真模型,基于冷水为3℃,热水为18℃,冷热水流量均为30 m^(3)·h^(-1)的额定工况,以冷水温升<0.5℃为优化目标,研究了操作参数和结构参数对冷水温升的影响。结果表明,在冷水进流时间大于热水进流时间10%时,冷水温升由冷热水进流时间相等时的5.42降低至1.01℃。以此为基础,当流量从10增加到50 m^(3)·h^(-1)时,冷水温升呈先减小后增大的变化趋势,在流量为30 m^(3)·h^(-1)时温升最小,为1.01℃。冷水温升与冷热水温差呈线性关系,温差每增加2℃,温升增加0.135℃,当温差降低至7℃时,冷水温升<0.5℃。缸体长度从6增加到18 m,冷水温升从1.01下降到0.10℃,在长度为12 m时冷水温升<0.5℃。缸体内径从130增加到280 mm,冷水温升从1.01下降到0.36℃,在内径为230 mm时冷水温升<0.5℃。压力交换装置0.5℃的超低冷水温升目标可优先通过调控冷热水进流时差及适当增加缸体长度或内径来实现,从而最大限度提升矿井降温系统的降温效果。
With the increasing depth of coal mining,the problem of mine heat hazard is increasingly serious with a high temperature of 30—40℃,which dramatically affects the safety of mine production.In order to effectively solve the heat hazard issues,ground centralized refrigeration cooling system with a pressure exchange device is innovatively applied in mine cooling because of the advantages of large cooling capacity and cooling heat discharge conveniently.During the pressure exchanging process,the mixing between hot and cold water is inevitable and greatly increases the temperature rise of cold water(CTR).In order to ensure the cooling effect of the mine cooling system coupled with the pressure exchange device,the computational fluid dynamic simulation model of the mixing between hot and cold water in the pressure exchange cylinder was established.Based on the rated work conditions of 3℃ cold water temperature,18℃ hot water temperature and both 30 m^(3)·h^(-1) hot and cold water flowrates,the influence of operating parameters and structural parameters on CTR were studied.The optimization objective of CTR is less than 0.5℃.The results show that when the inlet time of cold water is 10% longer than the inlet time of hot water,and the CTR decreases from 5.42℃ to 1.01℃.On this basis,the CTR shows a decrease and then increase trend by increasing the flowrate from 10 m^(3)·h^(-1) to 50 m^(3)·h^(-1),with a minimum CTR of 1.01℃ appearing at flowrate of 30 m^(3)·h^(-1).The temperature difference between hot and cold water has a linear relationship with the CTR,it increases 0.135℃ per increment of 2℃ temperature difference.When the temperature difference is decreased to 7℃,the CTR is less than 0.5℃.The CTR decreases from 1.01℃ to 0.10℃ as cylinder length increasing from 6 m to 18 m.The CTR is less than 0.5℃ when the length is 12 m.The CTR decreases from 1.01℃ to 0.36℃ with increment of inner diameter of cylinder from 130 mm to 280 mm.The CTR is less than 0.5℃ when the inner diameter is 230 mm.The target of 0.5℃ ultra-low CTR in the pressure exchange device can be achieved by adjusting the inlet time difference between hot and cold water and appropriately increasing the length or inner diameter of the cylinder,so as to maximize the cooling effect of the mine cooling system.
作者
李军
王越
许洪山
王军旗
LI Jun;WANG Yue;XU Hongshan;WANG Junqi(School of Chemical Engineering and Technology,Tianjin University,Tianjin 300350,China;State Key Laboratory of Chemical Engineering and Low Carbon Technology,Tianjin 300350,China;Tianjin Key Laboratory of Membrane Science and Desalination Technology,Tianjin 300350,China)
出处
《化学工业与工程》
北大核心
2025年第4期172-182,共11页
Chemical Industry and Engineering
基金
国家重点研发计划课题(2022YFC3202902)。
关键词
压力交换装置
矿井降温系统
冷热水混合
冷水温升
pressure exchange device
mine cooling system
mixing between hot and cold water
temperature rise of cold water
