摘要
In order to solve the heat damages in deep mines, a cool-wall cooling technology and its working model are proposed based on the principles of heat absorption and insulation in this paper. During this process, the differential equation of thermal equilibrium for roadway control unit is built, and the heat adsorption control equation of cool-wall cooling system is derived by an integral method, so as to obtain the quantitative relationship among the heat absorption capacity of cooling system, the heat dissipating capacity of surrounding rock and air temperature change. Then, the heat absorption capacity required by air temperature less than the standard value for safety is figured out by section iterative method with the simultaneous solution of heat absorption control equation and the heat dissipation density equation of surrounding rock. Finally, the results show that as the air temperature at the inlet of roadway is 25 ℃, the roadway wall is covered by heat-absorbing plate up to 39% of the area, as well as the cold water is injected into the heat-absorbing plate with a temperature of 20 ℃ and a mass flow of 113.6 kg/s, the air flow temperature rise per kilometer in the roadway can be less than 3 ℃.
为解决矿井热害问题,基于吸热、隔热原理,提出冷壁降温技术及其工作模型。建立了巷道控制体的热平衡微分方程,并采用积分方法推导出冷壁降温系统的吸热控制方程从而获得降温系统的吸热量,围岩的散热量和风温变化三者之间的定量关系。通过联立该吸热控制方程和围岩散热密度方程,采用分段迭代法计算出巷道风温不超过安全标准值所需的吸热量。计算结果表明,当入口风温为25℃时,在巷道壁面敷设覆盖面积为39%的吸热板,并在其内部通以20℃,113.6 kg/s的冷水就可以保证目标巷道内风流的千米温升低于3℃。
基金
Project(2018CXNL08) supported by the Fundamental Research Funds for the Central Universities,China。
