微孔分布器对光催化臭氧氧化反应器传质的影响
Effect of titanium porous plates on mass transfer performance of photocatalytic ozonation reactors
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摘要: 为了开发高效的光催化臭氧氧化反应器，以不同孔径钛微孔气体分布器对臭氧气液传质性能进行了研究。考察了表观气速和表观液速对液相总传质系数的变化影响规律，获得了液相总传质系数与表观气速的关联公式和微孔板孔径与表观气速对液相总传质系数的经验关联公式。利用无因次吸收数对微孔分布器的性能进行了分析，得到不同表观气速下微孔分布器的性能变化规律，表明在较低气体流速时，小孔径钛微孔分布板具有较高的吸收数值，有利于提高臭氧的利用率。为光催化臭氧化反应器的工业放大设计提供依据。Abstract: In order to develop high-efficient photocatalytic ozonation reactors， titanium porous plates with different aperture size were used as a gas distribution to study the ozone mass transfer performance in a gas-liquid bubble column. The effects of gas and liquid superficial velocities upon the mass transfer performance were studied. A relationship between the mass transfer coefficient and gas superficial velocity was established. Furthermore， an empirical correlation formula for mass transfer coefficient with aperture size of porous plates and gas superficial velocity was obtained. The dimensionaless sorption number， characterizing the ozone mass transfer efficiency， was used to evaluate the mass transfer performance of columns with the titanium porous plate of different aperture size. Performance variation law of columns with titanium porous plate of different gas superficial velocity was obtained. The result shows that in the low gas superficial velocity region， the columns with plate of small aperture has high sorption number， thus the ozone utilizing efficiency is higher. This study provides a basis for the scale up and development of photocatalytic ozonation reactors.
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Key words:
- photocatalytic ozonation /
- titanium porous plate /
- ozone mass transfer /
- sorption number
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