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方形冷卻型分離器內壁面和兩相流間的傳熱理論模型

注意:本論文已在《中國電機工程學報》2001,21(12):100-104發表
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蘇亞欣1 駱仲泱2 岑可法2
(1:東華大學環境科學與工程學院,上海,200051;2:浙江大學熱能工程研究所,杭州,310027)

摘 要: 對方形冷卻型分離器內的傳熱做了實驗測試,分析了實驗結果,并進一步對其傳熱模型進行了理論研究,建立了一個計算分離器內壁面的平均傳熱系數的理論模型。該模型由四部分組成:氣相對流傳熱,顆粒非穩態導熱傳熱,顆粒輻射傳熱和煙氣三原子輻射傳熱。顆粒和壁面間的導熱傳熱由兩部分組成:顆粒—壁面的彈性碰撞接觸過程的傳熱和被壁面捕集的顆粒下落過程和壁面的接觸導熱傳熱。模型計算的平均傳熱系數可以與實驗數據吻合。但模型結果受壁面顆粒濃度和顆粒碰撞壁面的速度的影響較大,而目前這兩個參數還不能與進口速度和濃度相關聯。
 
關鍵詞: 冷卻型分離器; 傳熱模型

A theoretical wall-to-suspension heat transfer model for square-shaped cyclone separator

Yaxin Su1 Zhongyang Luo2 Kefa Cen2
( 1: College of Environmental Science and Engineering, Donghua University, Shanghai, 200051; 2: Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027 )

Abstract: Experimental test on the suspension-to-wall heat transfer in a water/stream-cooled square-shaped cyclone separator, which was developed for large compact CFB boilers was conducted and the results were analyzed. Based on the experiment, a theoretical study on the heat transfer model was carried out and a model to calculate the mean heat transfer coefficient was established. The heat transfer model of this paper consists 4 components: gas convection, particle unsteady heat conduction, particle radiation and flue-gas radiation. The particle unsteady heat conduction includes heat conduction during the particle-wall elastic impact and the transient heat conduction of the collected particles when they fall down along the wall surface. The surface-averaged heat transfer coefficient calculated by this model showed good agreement with the experimental data. Model results showed the particle concentration near the wall and the impact velocity of particle-to-wall had much effect on the heat transfer, while these two parameters can not be related to the inlet particle concentration and velocity.
Keywords: square-shaped cyclone separator; heat transfer model

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