烟气净化径向移动床空腔临界空速行为的工程计算

Industrial computation of critical space velocity rising from cavity in radial flow moving beds for flue gas purification

给出了一种应用散体力学模型计算工业烟气净化径向移动床的空腔临界空速的工程计算方法与结果。应用散体力学颗粒极限行为的数学模型,考察了几何结构、颗粒物性、气流形式和床层空隙率因素对颗粒极限行为和空腔临界空速的影响,总结得出规律。研究表明,在现在应用的炭基吸附剂和工业空速条件下,工业空速远小于颗粒空腔临界空速,径向气流对颗粒的作用不会导致径向移动床内颗粒出现空腔现象。

An industrial computational method and corresponding results for critical space velocity rising from cavity in radial flow moving beds applied to industrial flue gas purification processes were presented in this paper based on the mathematical models of mechanics of granular materials. Using the aforementioned models,effects on granular critical behaviors and critical space velocity rising from cavity in radial flow moving beds packed with carbonaceous adsorbents were investigated extensively which included influencing factors as bed geometry and configuration,granular properties,gas flow patterns,and bed voidage. Meanwhile,the common rules related to the variation of granular critical space velocity rising from cavity were drawn from the calculation results. The results indicated that two important phenomena existed under the current applicable carbonaceous adsorbents and industrial space velocity,which included that the industrial space velocity was much less than granular critical space velocity rising from cavity,and the effect of radial-flow flue gas did not lead to granular cavity in radial-flow moving beds.