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煤层气开发过程中,微细的颗粒随气流进入集输管网。颗粒的存在使管流形成气固两相流动,影响管路特性。采用模拟软件针对直管段及水平弯管进行气固两相流数值模拟,对管道系统的特性、操作条件和物料性质等影响气固两相流压力损失的主要因素进行了探讨,对连续相速度和压力分布特性以及颗粒运动轨迹进行了分析,得到气固两相流动的压力场、速度场分布,颗粒在管内的分布情况和运动轨迹,以及不同工况条件下的系统阻力和颗粒沉积分布规律,并结合煤层气现场含尘情况进行了数值模拟分析,结果表明:煤层气管道管流属于低浓度气固两相流,与纯气相单相流相比,颗粒引起的单位管长压降增幅低于2%。(图7,表1,参12)
During the CBM development process, fine particles enter the gathering pipe network with air flow. The existence of particles makes the pipe flow gas-solid two-phase flow, affecting the pipe properties. The simulation software was used to simulate the gas-solid two-phase flow in the straight pipe section and the horizontal pipe bend. The main factors affecting the pressure loss in the gas-solid two phase flow were discussed, such as the characteristics of the pipe system, operating conditions and material properties. And pressure distribution characteristics and particle trajectory were analyzed, and the pressure field and velocity field distribution of gas-solid two-phase flow, the distribution and movement trajectory of particles in the pipe and the system resistance and particle deposition distribution under different working conditions were obtained The results show that coalbed methane pipe flow belongs to low concentration gas-solid two-phase flow. Compared with pure gas single-phase flow, the increase of pressure drop per unit pipe length induced by particles Below 2%. (Figure 7, Table 1, reference 12)