基于欧拉-双流体模型和流态化氯化临界流化速度经验公式,结合云南高钛渣物性参数,研究了其流态化氯化的初始流化速度下高钛渣流态化氯化特性、气泡运动对床层的扰动、气泡大小与分布板位置关系.研究结果表明:Grace方程能准确预测B类颗粒窄粒径的高钛渣流态化氯化气泡行为,Wen-Yu方程预测的初始流化速度下乳相和气泡出现时间延后;完全流化速度下,通过上升、合并长大、破裂过程,在分布板位置形成气泡;通过钛渣固体矢量图得出,整个床层以气泡为分界,气泡上升对上、下部颗粒的流动产生影响,导致床层不均匀.
The hydrodynamic characters,disturbance of bubble motion to bed and relationship between bubble size and distributed plate position under the initial fluidization velocity in fluidized chlorination of high-titanium slag in Yunnan was studied based on the Euler Two-fluid Model and Critical Fluidization Velocity Empirical Formula for fluidized chlorination,combining with the physical parameters of Yunnan high-titanium slag.The results show that the Grace Correlation can precisely predict the bubble behaviors in fluidized chlorination of the high-titanium slag with narrow size distribution of B-type particles,and the appearance of emulsion phase and bubbles predicted by Wen-Yu Correlation under initial fluidizing velocity is postponed.The bubbles are formed at the distributed plate positions through three stages of rise,consolidation and burst under full fluidizing velocity.The solid-vector diagram of the high titanium slag indicates that the whole bed is demarcated by the bubbles and the bubble rising process affects the fluidization of upper and lower particles which results in unevenness of the entire bed.
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