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化工学报  2015 

直接接触式制备CO2水合物的生长和蓄冷特性

DOI: 10.11949/j.issn.0438-1157.20141327, PP. 1521-1528

Keywords: 二氧化碳,水合物,压缩机,蓄冷,直接接触式

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Abstract:

采用直接接触式水合物反应釜,并在釜内初始水温为26℃和15℃以及充注压力为3.6~4.2MPa的条件下制备CO2水合物,研究其生长和蓄冷特性。实验结果表明:在初始水温为15℃、充注压力为3.6MPa时,预冷时间较短(11min),水合物开始生长时过冷度约为1.3℃,温升不明显,平均蓄冷速率和平均蓄冷效率分别为82.4kJ·min-1和4.34;在其他温压条件下,预冷时间较长(20~55min),但随充注压力的升高而减小,过冷度较大(5.5~9.7℃),水合物生长迅速且密集,温升明显,并在充注压力为4.0MPa时温升幅度最大,水合物平均生长速率、总蓄冷量、平均总蓄冷速率和效率随充注压力的升高而变大,其最大值分别为77和154g·min-1,3.725和3.791MJ,64.1和99.5kJ·min-1,3.14和4.91。水合物释冷分解是一个相变过程,相变温度一般在10~14℃。

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