液态CO_2爆破系统相变过程的热力学特性研究  

Thermodynamic Properties of Liquid Carbon Dioxide Blasting System in Process of Phase Transformation

作　　者：郭勇 柯波 吴著明 任高峰[2,3] GUO Yong;KE Bo;WU Zhu-ming;REN Gao-feng(China Railway 14^th Bureau Group 2^nd Engineering CO LTD,Tai'an 271000,China;School of Resources and Environmental Engineering,Wuhan University of Technology,Wuhan 430070,China;Key Laboratory of Mineral Resources Processing and Environment of Hubei Province,Wuhan 430070,China;Public Security Detachment of Zhongshan Public Security Bureau,Guangdong Province,Zhongshan 428400,China)

机构地区：[1]中铁十四局集团第二工程有限公司,泰安271000 [2]武汉理工大学资源与环境工程学院,武汉430070 [3]矿物资源加工与环境湖北省重点实验室,武汉430070 [4]广东省中山市公安局治安支队,中山428400

出　　处：《爆破》2018年第4期108-115,共8页Blasting

基　　金：国家自然科学基金(51774220);中国博士后科学基金面上项目(2018M632936)

摘　　要：为了研究液态CO_2爆破过程的热力学特性,进行了液态CO_2爆破系统管内压力测试实验,得到了液态CO_2爆破系统爆破管内压力与时间关系曲线,结合Span&Wagner CO_2状态方程,获得爆破管内温度、等容比热容、内能、熵和亥姆霍兹自由能热力学特性。结果表明:爆破管内CO_2温度上升速率随着密度的减少而增大,初始温度越高,汽化过程中温度上升速度越快。温度曲线先呈现上凹的指数曲线变化,随后以线性方式直线快速上升,然后再逐渐减缓。压力、内能、熵和亥姆霍兹自由能曲线与温度曲线具有相同的变化规律,并随着温度增大而呈现线性增大。密度对等容比热容曲线影响很大,密度越小,等容比热容在临界温度点出现峰值越大,等容比热容的变化规律决定了温度曲线上升速度的快慢。结合爆炸热力学理论和Span&Wagner状态方程给出了液态CO_2爆破试验爆炸能量的计算方法。In order to study the thermodynamic properties of liquid CO2 blasting system,the pressure in the liquid CO2 blasting system was measured in the laboratory,and the relationship of pressure and time was obtained. Combined with Span & Wagner CO2 equation of state,the thermodynamic properties were obtained,including temperature,isochoric heat capacity,internal energy,entropy,and Helmholtz free energy in the tube. The results show that the temperature rise rate increases with an decrease in the density,and the higher initial temperature,the vaporization temperature rises faster. The temperature shows a concave exponential curve firstly,then increases rapidly in a linear curve,finally tends to be gentle. The curves of pressure,internal energy,entropy,and Helmholtz free energy increase with the temperature. The density makes effect on isochoric heat capacity,for the smaller density,the larger critical temperature is obtained,and the changes of isochoric heat capacity determines the temperature rise rate. Combined with Span & Wagner CO2 equation of state and thermodynamic of explosion,the calculation method of energy of explosion for the liquid CO2 blasting experiment is given.

关 键 词：非炸药爆破 CO2爆破 亥姆霍兹自由能 爆炸能量 

分 类 号：TD804[矿业工程—矿山开采]