二氧化碳气体井下远距离输送的可行性研究

Feasible Research of Long Distance Underground Transportation for Carbon Dioxide Gas

为了解决液态二氧化碳地面气化后借助矿井现有管路将气体从井上至井下远距离输送后能否顺利排放的问题,构建了由低温液体储罐、气化器和调压稳压装置及其配套的管阀等组成的非增压型地面固定式二氧化碳气体集中供应系统。基于简单管路内流体的能量损失具有加和性的技术原理,建立数学模型,综合了沿程损失,管道入口、弯管和阀门的局部阻力等多种因素,进行了流体力学相关计算,得出并对比分析了将气体自身压力作为动力的有用功与输送过程中的总阻力,证明了当管路长度不超过5 km,总阻力不超过3.539×105 J/kg,其末端气体能够顺利排放至井下火区密闭空间,保证其输送可行性的最大管路长度不低于19 km。

In order to solve the problem involving whether the gas after ground gasification of liquid carbon dioxide can be transported from mine floor to underground with the existing pipeline of the mine, concentration supply system of the non-pressurized ground fixed carbon dioxide gas composed of the low temperature liquid storage tank, the gasifier, the voltage regulator device and the auxiliary pipe valves is constructed. The mathematical model is established based on the technical principle of additivity for the energy loss of fluid in simple piping fluid, which includes the loss along the pipeline, the local resistance of pipe entrance, elbow, valves, and other factors, the useful work of gas itself pressure as the power and the total resistance in the process of transport is obtained and compared by the calculation of the fluid mechanics to prove that the length of the pipeline does not exceed 5 km, the total resistance does not exceed 3.539 ×105 J/kg, gas from the end of the pipeline can be successfully discharged into the confined space of underground fire area, the maximum length of the pipeline is not lower than 19 km in order to ensure transport feasibility.