本文選題：流化床　切入點(diǎn)：密相區(qū)　出處：《化工學(xué)報(bào)》2017年10期 　論文類型：期刊論文

【摘要】：運(yùn)用一種離散單元法(DEM)計(jì)算顆粒流體力學(xué)(CPFD)對尺寸為900 mm×100 mm×1200 mm的準(zhǔn)三維流化床的密相區(qū)大顆粒擴(kuò)散行為進(jìn)行研究。模擬之前,依照前人實(shí)驗(yàn)研究對CPFD方法進(jìn)行驗(yàn)證,模擬結(jié)果與實(shí)驗(yàn)結(jié)果符合較好,證明了CPFD方法模擬的有效性。模擬中通過注入示蹤粒子的方法來研究大顆粒在密相區(qū)中的橫向擴(kuò)散系數(shù),研究了流化風(fēng)速、顆粒直徑對顆粒橫向擴(kuò)散系數(shù)的影響。模擬結(jié)果顯示,氣泡是引起密相區(qū)內(nèi)顆粒混合的主要因素;隨著流化風(fēng)速增加,顆粒橫向擴(kuò)散系數(shù)變大;隨著顆粒直徑增大,顆粒橫向擴(kuò)散系數(shù)減小。
[Abstract]:Using a discrete element method (DEM) to calculate particle hydrodynamics (CPFDs), the diffusion behavior of large particles in a quasi-three-dimensional fluidized bed with a size of 900mm 脳 100mm 脳 1200mm was studied. Before the simulation, the CPFD method was verified according to previous experimental studies. The simulation results are in good agreement with the experimental results, which proves the validity of the CPFD method. In the simulation, the transverse diffusion coefficient of large particles in the dense phase region is studied by injecting tracer particles, and the fluidized wind speed is studied. The effect of particle diameter on particle transverse diffusion coefficient. The simulation results show that bubble is the main factor causing particle mixing in the dense phase region, the particle transverse diffusion coefficient increases with the increase of fluidization wind speed, and the particle diameter increases with the increase of particle diameter. The particle transverse diffusion coefficient decreases.
【作者單位】： 上海理工大學(xué)能源與動(dòng)力工程學(xué)院;清華大學(xué)熱能工程系;
【基金】：國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFB0600201)~~
【分類號(hào)】：TQ021.1
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本文編號(hào)：1557540