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Study on the Degradation Characteristic of Novel Photoreactor and the Distribution of Light Intensity

Author: LiHongHui
Tutor: HaoXiaoGang
School: Taiyuan University of Technology
Course: Chemical Engineering
Keywords: Labyrinth flow reactor Two-dimensional fluidized bed Light intensity distribution Photocatalytic Ring fluidized bed Mathematical model
CLC: TQ032
Type: Master's thesis
Year: 2007
Downloads: 146
Quote: 0
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Abstract


This thesis the new labyrinth wrong stream bubbling reactor (LBPR) by material balance established LBPR reactor multistage continuous stirred tank in series model and the intermittent recirculation system model combined photocatalytic reaction kinetic equation to describe the export The mathematical relationship between the concentration and the number of baffles, the liquid level height and the reaction time. Predict the number of baffles, liquid level, liquid velocity, amount of processing, light intensity, and the influence of the catalyst on the rate of degradation. 30-40 mesh activated carbon as the carrier prepared by sol - gel method supported TiO 2 film particles photocatalyst and photocatalytic degradation of wastewater containing methyl orange. The reactor baffle plate number and effluent liquid height and structure parameters impact on the the organics degradation of performance. The results showed that: when the baffle 12, the liquid height 4cm, fluid volume 0.0111m 3 · h -1 , catalyst 4.8g · L -1 completely fluidize under operating conditions for 1.5h, the degradation rate of 100%. The experimental data are basically consistent with the theoretical analysis. Additionally examine the external parallel light source, the liquid - solid and gas - liquid - solid two-dimensional fluidized bed, the light intensity distribution on the bed and Fluctuation of the fluid flow conditions. Lambert - Beer law established a mathematical model of the intensity distribution in the two-phase and three-phase fluidized bed, and analysis of the liquid holdup, the gas holdup and gas, solid PHASESPECTROPHOTOMETRY coefficient bed light intensity distribution and The self-made fiber intensity sensor measured the intensity distribution in the bed and the heartbeat. Exponential decay in intensity along the radial direction of the bed in a two-dimensional fluidized bed, liquid holdup and gas holdup increases, the theoretical calculations with the experimental results. Since light intensity fluctuation signal power spectrum analysis showed that the liquid - solid fluidized bed power spectral density from low frequency to high frequency was regularity attenuation due to the impact of the power spectrum of the bubbles in the gas - liquid - solid fluidized bed density fluctuation peaks appear in the 5 ~ 12 Hz, a frequency consistent with the generation of the bubble. Light regarded as quantum flow, combined with the Lambert - Beer's law to establish a mathematical model of the light intensity distribution of ring-type fluidized bed, the solid phase catalyst light absorbing, light absorption of the amount of catalyst, methyl orange, and the reaction time on the the bed light intensity distribution. Material balance intermittent recirculation system model of the reaction system to describe the mathematical expression between export concentration and reaction time, to predict the liquid velocity, amount of catalyst degradation. By the sol - gel prepared the supported TiO 2 film particles photocatalyst Photocatalytic Degradation of methyl orange wastewater ring fluidized bed photocatalytic reactor, and the self-made fiber The light intensity sensor measuring the light intensity distribution in the bed, to verify the model and the fluctuation signal for a power spectrum analysis. The results show that: the light intensity in the radial direction of the bed decays exponentially; As the reaction proceeded, the intensity distribution gradually flat; With the increased amount of catalyst, intensity attenuation to accelerate the; gas - liquid - solid fluidized bed due to by the impact of the power spectral density of the bubbles appear and downs; gas velocity 15L · min -1 , the liquid flow rate of 290 mL · min -1 , the amount of catalyst was 9.6g · L < sup> -1 is the best operating conditions, operating conditions for 1.5h hours after methyl orange degradation rate of nearly 100%. The theoretical calculation is basically consistent with the experimental data.

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