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An Investigation on Heat Exchange between Ceramic Beads and Biomass Chars in a V-shaped Down-flow Tube

Author: TianZhongJun
Tutor: BaiXueYuan
School: Shandong University of Technology
Course: Agricultural Biological Environmental and Energy Engineering
Keywords: V-shaped down tube Heat exchange Ceramic ball Biomass semi-coke
CLC: TK6
Type: Master's thesis
Year: 2010
Downloads: 47
Quote: 1
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Abstract


Decreased tubular heat carrier fast pyrolysis system to produce bio- oil process is the use of high temperature ceramic ball heat carrier in heated biomass powder down pipe falling so fast pyrolysis liquefaction generate a bio-oil technology , their pass the study of the thermal mechanism to contribute to the study of the process of biomass pyrolysis law . Soon due to the high temperatures of biomass powder initial pyrolysis of biomass char is Biomass half Jiaozuo more reasonable for the experimental material . The subject in a vertical decline in the tube ceramic balls with raw material half coke heat exchange law research foundation down V-shaped tube heat exchange of the two dispersion law of the experimental study , the main contents include : First of all , according to the actual thermal Solutions for experimental apparatus , in the the vertical falling tubular dispersion of heat exchange on the basis of experimental station , re-design and improved V-shaped down the dispersion of the tubular heat exchange experimental station , and re - measured in the semi-coke feed rate of the biomass ceramic ball down pipe system ; Secondly, the study individually fed different initial temperature ( 50 ° C , 60 ° C , 70 ° C ) heat exchange law ; then study different ceramic ball early temperature ( 50 ° C , 60 ° C , 70 ° C ) , semi- coke of different biomass mass flow (32,40,53.3 g / min) dispersion law of heat exchange ; Finally, scattered body heat absorption and release study . Study above , the following conclusions : ceramic ball total heat release increases linearly with increasing the initial temperature of the ceramic balls , ceramic ball bustling traffic and the thermal conductivity of the ceramic ball wall air convection for steady state increase heat flow ; ceramic ball final temperature , the temperature difference between the air temperature inside the pipe and wall insulation layer are increased exponentially with time , the ceramic balls with air convection heat transfer coefficient with the temperature rise of the ceramic ball early and linear increases ; raw material and semi-coke heat flow , thermal conductivity, heat flow accounts for the main part ; granular heat absorption and desorption ratio increases with the loose body mass flow ratio decreases .

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CLC: > Industrial Technology > Energy and Power Engineering > Bio-energy and its utilization
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