多相光催化反应器辐射能模型的建立与验证
Model and verification of radiation energy in multiphase photocatalytic reactors
-
摘要: 采用双通量模型模拟了管式三相流化床光催化反应器中辐射能分布和局部体积能量吸收速率，并采用负载型TiO2/SiO2光催化剂进行了实验验证，考察了液相介质、通气量及催化剂浓度对光辐射强度和体积能量吸收速率的影响。实验结果表明，实验数据和模型计算值能够较好吻合，蒸馏水做液相介质时，可将气液鼓泡流看成单一的连续相，催化剂浓度越大，光辐射能沿径向衰减越大，起始局部体积能量吸收速率越大同时衰减越快。本实验中使用TiO2/SiO2光催化剂时反应器中最佳催化剂浓度为10~12 g/L，此浓度下光辐射能利用率超过85％。完善后的双通量模型对于气、液、固三相光催化反应器的光学厚度设计和催化剂浓度选择具有指导意义。Abstract: Two-flux model was applied for the modeling and verification of radiation energy and local volumetric rate of energy absorption (LVREA) in a photoreactor of annular three-phase fluidized bed with TiO2/SiO2 photocatalyst. The influence of liquid medium， air flux and catalyst concentration on the light intensity and LVREA was investigated. The experimental results indicated that the experimental data could well agree with the calculated data. With the liquid medium of water the liquid and gas could be regarded as a single continuous phase. As the catalyst concentration increased， the radiation energy decayed fast along radial direction while the initial LVREA increased but LVREA along radial direction decayed fast. The optimum concentration of TiO2/SiO2 phtocatalyst was 10~12 g/L on which condition the availability of radiation energy was more than 85%. The modified two-flux model has significant effects on the selection of optical depth and catalyst concentration in liquid-solid-gas photoreactors.
-
Key words:
- photocatalysis /
- reactor /
- radiation /
- two-flux model /
- three-phase fluidized bed
-
-
点击查看大图
计量
- 文章访问数: 1850
- HTML全文浏览数: 841
- PDF下载数: 1059
- 施引文献: 0
下载:
