天然气水合物颗粒-水流态化特性模拟研究

Simulation of hydrodynamics of natural gas hydrate particle and water flow in fluidized bed

在高0.8m,宽0.1m的二维流化床中对天然气水合物颗粒-水的流态化特性进行了模拟,研究了水的入口流速、天然气水合物颗粒直径和密度、初始床层体积分数和初始床高等参数对颗粒分布和压力降等参数的影响。由模拟结果可以看出,床层压力降主要受天然气水合物颗粒密度、初始床层体积分数和床高的影响较大,在初始床高为0.4m时,压力降最大,为1600Pa。而天然气水合物颗粒的分布受水的入口流速、颗粒粒径和初始体积分数影响较大,当水的入口流速在0.06m/s和0.08m/s,颗粒粒径在1.2mm和1.5mm,颗粒初始床层体积在0.4,0.5,0.6时,颗粒在径向上分布的不均匀性提高,但总的而言,这些影响因素可以被调节和控制,同时,本文也为流化床在天然气水合物开采中的进一步应用提供了理论依据。

The fluidization characteristics of natural gas hydrate particles-water were simulated in a 2-D fluidized bed with a height of 0.8 m and a width of 0.1 m. The effects of water inlet velocity, hydrate particle diameter and density, initial bed volume fraction and initial bed height on particle distribution and pressure drop were studied. The results show that the pressure drop of the bed is mainly affected by the hydrate particle density, the initial volume fraction and height of the bed. The largest pressure drop is 1600 Pa at initial bed height of 0.4 m. The distribution of hydrate particles is greatly influenced by the water inlet velocity, particle size and initial volume fraction. When the water inlet velocity is 0.06 m/s and 0.08 m/s, particle size is 1.2 mm and 1.5 mm, and the initial bed volume is0.4, 0.5 and 0.6, the local hydrate particle phase holdup will be not uniform in some radial positions. Generally, these influencing factors could be manipulated, and this paper also contribute to the application of fluidized bed for future gas hydrate recovery process.