Optimization of formaldehyde purification parameters in return air cycle unit of clean plants by photocatalysis

 Discusses the effects of photocatalysis species, dosage and light intensity on the degradation efficiency of formaldehyde in the return air purification device to determine the parameters of the photocatalysis purification net. Determines the formaldehyde concentration by phenol reagent spectrophotometry. Screens the optimal parameter combination of photocatalysis purification net for 15-min degradation efficiency in the return air purification device by orthogonal test in a 60 m3 simulated clean plant. The results show that photocatalysis dosage has a significant difference in formaldehyde degradation efficiency. Direct analysis finds that the order of influence of purification parameters on formaldehyde degradation efficiency is photocatalysis dosage, light intensity, photocatalysis species. The comprehensive analysis shows that the optimal parameters of the photocatalysis purification net are nano-TiO2, photocatalysis dosage (three times) 30 g/m2, and UV lamp 20 W. The optimal parameter combination of the photocatalysis purification net can improve the formaldehyde degradation efficiency in the clean plants.