基于群体平衡理论的竖直管内水合物浆液流动特性模拟

Numerical simulation of hydrate slurry flow characteristics in vertical pipe based on population balance theory

基于海洋非成岩天然气水合物(简称水合物)颗粒聚集动力学的群体平衡模型,对水合物浆液在竖直管内的流动特性进行了模拟研究,重点模拟研究了水合物浆液体积分数、平均流速对竖直管内水合物浆液流动特性的影响;根据模拟结果,研究了不同工况下流动压降、浓度分布以及水合物粒径分布等流动特性,为水合物开采中举升管内水合物浆液流动特性提供借鉴。实验结果表明,所建模型可较好地模拟水合物浆液在竖直管内的流动状态;较低的浓度和较高的流速有利于保证水合物浆液地竖直管内的流动安全,但不利于输送的经济性。

In this paper,the flow characteristics of hydrate slurry in vertical pipes were simulated using the population balance model based on particle aggregation dynamics of marine non-diagenetic gas hydrate(hereinafter referred to as hydrate),which can better simulate the effect of hydrate volume fraction and the average flow velocity of hydrate slurry on the flow characteristics of hydrate slurry in the vertical pipes. The flow characteristics of flow pressure drop,concentration distribution and hydrate particle size distribution of under different working conditions were studied according to simulation results,to provide reference for the flow characteristics of hydrate slurry in lift pipe during hydrate mining. The experiment results showed that,the model can well simulate the flow state of hydrate slurry in the vertical pipes,and lower concentration and higher flow rate were beneficial to ensure the flow safety of the hydrate slurry in the vertical pipes,but were not conducive to the economy of transportation.