人工煤气管道萘颗粒沉积规律研究

针对萘在人工煤气管道中沉积会造成管道堵塞，影响管道的安全运行的这一问题，以昆明人工煤气管道为例，运用计算流体动力学软件Fluent，选用离散相模型和雷诺应力模型，对水平直管、水平弯管和三通管进行萘颗粒沉积的数值模拟，对于不同的管径、弯曲比、管径比，分别分析萘颗粒直径、入口速度、温度及压力对萘颗粒沉积的影响。研究结果表明:水平直管、水平弯管、三通管中的萘颗粒沉积率与颗粒粒径成正相关关系，而与气流入口速度、压力成负相关关系；萘颗粒在人工煤气管道中的沉积率主要受颗粒直径、气流入口速度的影响；萘颗粒的沉积率随着水平直管的管径增大而增大，随着水平弯管的弯曲比增大而增大，随着三通管的管径比增大而先增大后减小；可通过适当增大管内煤气输送速度、压力，降低温度来降低萘颗粒在人工煤气管道中的沉积速度，进而减少萘颗粒沉积的发生。

Study on deposition laws of naphthalene particles in manufactured gas pipeline

Aiming at the problem that the deposition of naphthalene in the manufactured gas pipeline will cause the blocking of pipeline and influence the safe operation of pipeline, taking the manufactured gas pipeline in Kunming as the example, the numerical simulation on the deposition of naphthalene particles in the horizontal straight pipe, horizontal bend pipe and tee pipe were carried out based on the discrete phase model (DPM) and the Reynolds stress model (RSM) by using the computational fluid dynamics software FLUENT, and the influence of diameter of naphthalene particle, inlet velocity, temperature and pressure on the deposition of naphthalene particles under different pipe diameters, curvature ratios and pipe diameter ratios were analyzed respectively. The results showed that the deposition rates of naphthalene particles in the horizontal straight pipe, horizontal bend pipe and tee pipe were positively correlated with the diameter of naphthalene particle, and negatively correlated with the inlet velocity of gas flow and pressure. The deposition rate of naphthalene particles in the manufactured gas pipeline was mainly affected by the diameter of naphthalene particle and the inlet velocity of gas flow. The deposition rate of naphthalene particles increased with the increase of pipe diameter of the horizontal straight pipe, and increased with the increase of curvature ratio of the horizontal bend pipe, while increased first and then decreased with the increase of pipe diameter ratio of the tee pipe. The deposition speed of naphthalene particles in the manufactured gas pipeline could be reduced by appropriately increasing the gas transportation velocity and pressure and decreasing the temperature in the pipeline, thus reduce the occurrence of deposition of naphthalene particles.