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循環流化床顆粒團更新傳熱模型的修正

注意:本論文已在《動力工程》2001,21(5):1426-1429,1416發表
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蘇亞欣 駱仲泱 岑可法
(浙江大學熱能工程研究所,杭州,310027)

摘 要: 對顆粒團更新傳熱模型做了修正,引入新的床內流動特性的研究結果,改進了顆粒團覆蓋壁面的百分比和顆粒團—壁面之間的氣膜厚度的表達式,使之與床的宏觀運行參數以及床體、床料的參數相聯系,從而避免了前人模型中憑經驗來確定一個比例系數的缺陷。對于彌散相和壁面間的輻射傳熱,考慮到了它們的直接輻射和彌散相輻射到顆粒團、再經顆粒團反射到壁面的傳遞過程。模型計算結果和有關實驗數據的對比吻合較好,說明本文的修正模型是合理的。
 
關鍵詞: 循環流化床 傳熱模型 修正

Modification to the CFB Cluster-Renewal Heat Transfer Model

Yaxin Su Zhongyang Luo Kefa Cen
( Institute of Thermal Power Engineering, Zhejiang University, Hangzhou, 310027 )

Abstract: Based on the Cluster Renewal Model of the particle motion in a CFB riser, the authors developed a revised heat transfer model, which introduced the latest research results of the hydrodynamics of the suspension flow in CFB. This model divided the heat transfer into two parts, which are due to the transient heat conduction by the covered clusters and the convection between the uncovered wall and the dispersed phase. Radiation at high temperature was regarded as being additive. The fraction of the covered wall by clusters and the thickness of the gas gap between clusters and wall were revised by a new formula, which is a function of the operating condition and the particle properties. The Radiation between the dispersed phase and the uncovered wall included not only the direct radiation to the uncovered wall, but also the radiation to the clusters and then reflected to the uncovered wall. The model results showed good agreement with the published experimental data, which proved the modification was reasonable.
Keywords: circulating fluidized bed heat transfer model modification

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