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豎直下降管換熱實驗臺改進(jìn)設(shè)計與實
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Design and Experiment of Heat Transfer Platform for a Down-flow Tube
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    摘要:

    下降管式熱解液化裝置能夠?qū)崿F(xiàn)生物質(zhì)熱解液化。為了研究下降管中生物質(zhì)半焦和陶瓷球兩種散體混合下落的換熱規(guī)律，在前期研究的基礎(chǔ)上，對實驗設(shè)備進(jìn)行了改進(jìn)設(shè)計，并將原實驗物料——生物質(zhì)粉更換為生物質(zhì)半焦，使實驗結(jié)果對實際裝置的設(shè)計與改進(jìn)更具指導(dǎo)意義。根據(jù)不同溫度陶瓷球（50、60、70℃）與室溫空氣的換熱實驗，通過熱平衡分析，得到了陶瓷球熱載體與空氣的對流傳熱系數(shù)h=600W/(m2?K)；陶瓷球與生物質(zhì)半焦顆粒換熱實驗表明，不考慮邊界效應(yīng)時豎直管內(nèi)溫度呈線性分布；對流換熱為豎直下降管系統(tǒng)熱量傳遞的主要方式。

    Abstract:

    The down-flow tube reactor was used for biomass pyrolysis liquefaction and proved effective. In order to study the characteristics of heat transfer between ceramic balls and biomass chars, an improved experimental platform of down-flow tube was designed based on the former research. In addition, the former experimental material biomass particles were replaced by chars, and the result of experiment would be indicative to the industry application. Based on the heat exchange experiment among the ceramic balls at different temperature (50,60,70℃) and the air at room temperature, by the analysis of thermal equilibrium, the convective heat exchange coefficent between ceramic balls and the air was worked out and the value was about 600W/(m2?K). The result of heat transfer experiment between ceramic balls and chars shows that temperature in the vertical tube obeys linear rule as the edge effect is not considered. The leading way of heat transfer in the down-flow tube is the convective heat exchange. 

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袁廷璧,易維明,李志合,殷哲,劉煥衛(wèi),田中君.豎直下降管換熱實驗臺改進(jìn)設(shè)計與實[J].農(nóng)業(yè)機(jī)械學(xué)報,2009,40(7):107-111. Design and Experiment of Heat Transfer Platform for a Down-flow Tube[J]. Transactions of the Chinese Society for Agricultural Machinery,2009,40(7):107-111.

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