|Table of Contents|

Volumetric heat transfer coefficient of drying corn paste in fluidized bed with inert particles

《南京理工大学学报》(自然科学版)[ISSN:1005-9830/CN:32-1397/N]

Issue:
2013年04期
Page:
627-
Research Field:
Publishing date:

Info

Title:
Volumetric heat transfer coefficient of drying corn paste in fluidized bed with inert particles
Author(s):
Zhao Sikun1Liu Wei2Sha Haifei3Zhang Yanli2Wang Zhixiang1
1.School of Pharmacy,China Pharmaceutical University,Nanjing 210009,China; 2.School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210042,China; 3.Nanjing Hydraulic Research Institute,Nanjing 210029,China
Keywords:
inert particles fluidized bed drying corrugated gas distributor corn paste volumetric heat transfer coefficient
PACS:
TK173
DOI:
-
Abstract:
To investigate and improve the volumetric heat transfer coefficient index of drying corn paste in fluidized bed with inert particles,the flow field in bed is preliminarily analyzed by means of the modern simulation technique of computational fluid dynamics,and as a result,a novel corrugated gas distributor designed in our lab is recommended to replace the traditional flat plate distributor with a straight hole structure.The relative change laws concerning the volumetric heat transfer coefficient are acquired and summarized by testing the effect relationship curves of volumetric heat transfer coefficient with respect to gas intake rate,gas intake temperature and etc.Based on the orthogonal experiment design with range analysis,the effect degrees of different operational factors on volumetric heat transfer coefficient are discussed and the relevant parameter optimization work is performed,and a calculation formula of volumetric heat transfer coefficient is subsequently constructed via dimensional analysis.The study results show:the volumetric heat transfer coefficient increases with the increase of gas intake rate,feed mass flow or inert particle static bed height,and decreases with the increase of inert particle diameter,and increases firstly and decreases later with the increase of gas intake temperature.Moreover,compared with the traditional flat plate distributor,the novel corrugated gas distributor can bring higher volumetric heat transfer coefficient.Meanwhile,the effect degree order of operational factors on volumetric heat transfer coefficient is gas intake rate>gas intake temperature>inert particle static bed height>feed mass flow>inert particle diameter,and the optimum technological combination is gas intake rate at 6.5 m/s,gas intake temperature at 90 ℃,inert particle diameter at 1.5 mm,feed mass flow at 11.5 g/s and inert particle static bed height at 40 mm,while the value of volumetric heat transfer coefficient can reach about 2.76 kW/(m3·℃).Besides,the constructed correlation formula is also suitable for the calculation and estimation of volumetric heat transfer coefficient,and its predicting values are in good agreement with the experimental data.

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Last Update: 2013-08-31