| With the development of the national real estate construction industry,the impact of the indoor environment on people's life and health has been increasingly valued by the public,and because of the improvement of people's requirements for indoor living comfort,a large number of buildings have been over-renovated,making the quality of the air environment worse and worse,the indoor air quality is gradually decreasing,and formaldehyde is one of the most important pollutants in indoor air.In the existing research,it is found that photocatalytic oxidation technology is the most effective method for indoor air purification.It has the characteristics of thorough reaction,fast reaction rate and safety.Therefore,it is necessary to integrat the advantages of the existing photocatalytic purification device,how to apply the photocatalysis oxidation technology into practice better,so that the existing photocatalytic air purification device is optimized to make it more beneficial to the development of photocatalytic air purification device.In this paper,a new type of photocatalytic air purification device based on the principle of photocatalytic oxidation reaction was developed and a prototype was made.Secondly,the degradation effect of formaldehyde on this experimental device was studied by setting up an experimental platform,optimizing the photocatalytic air purification device,designing the experimental scheme,and preparing materials for the experiment,and it was compared with the traditional flat-plate reactor.Orthogonal experimental design was selected to carry out experiments on three controllable influencing factors,and the relevant data in mathematical statistics was used to effectively analyze the experimental data to determine the optimal operating conditions for this experiment.And finally experiments were carried out under this operating condition to explore the best purification effect of the new photocatalytic air purification device,the method of reactor optimization was studied by analyzing the performance of formaldehyde degradation.The main research results are as follows:(1)Placing the new photocatalytic air purification device and the traditional flat-plate reactor under the same experimental conditions,the degradation effect of the self-designed experimental device for formaldehyde purification is more significant,and the degradation efficiency is increased by 25%.(2)Through orthogonal experiment design,natural attenuation experiment and total attenuation experiment analysis,the best experimental conditions of the new photocatalytic air purification device designed by ourselves are as follows: the initial concentration of formaldehyde is 1.0mg/m3,the thickness of catalyst load is 0.017 mm,and the ultraviolet light source is germicidal lamp.(3)Taking the amount of clean air as the performance evaluation index and analyzing the results of orthogonal experiments,it can be concluded that the initial formaldehyde concentration,the thickness of the photocatalyst and ultraviolet light source,the three controllable factors have different influence significance on the new photocatalytic air purification device and the significance level is: ultraviolet light source > photocatalyst loading thickness > formaldehyde initial concentration.(4)When the experimental device is under the optimal experimental conditions,after 120 minutes of the experiment,it can be obtained that the degradation efficiency of formaldehyde in the total attenuation experiment can reach 81%,the total attenuation coefficient Ke = 0.02,the degradation effect is better.In this experiment,the volume of the environmental test chamber(laboratory compartment)was converted to the standard volume in the specification.The purification energy efficiency analysis of the device shows that the device can be classified as a high-efficiency air purifier. |
PDF Full Text Request