折板光催化反应器降解甲醛效果测试

FORMALDEHYDE REMOVING PERFORMANCE IN FOLDED-PLATE PHOTOCATALYTIC REACTOR

采用对比法测试不同结构折板反应器光催化降解甲醛的效果，并用CFD软件对流速场和降解效率进行模拟计算。研究表明：折板反应器能增大反应面积和紫外光入射角，平衡传质．反应能力，与平板型相比，广角型和窄角型折板反应器的降解效率分别提高1．5倍和1．9倍；CFD模拟说明折板反应器内竖直方向流速分布均匀，但水平方向和薄板表面分布不均，影响对流传质效果；与实测数据相比，模拟计算结果高出6．4％～15．1％，但两者变化趋势相同；并且反应器内湿度过高会降低降解效率。

The comparing method was used to test the effect of photocatalytic degradation of formaldehyde for folded- plate reactors with different structures, and CFD software was used to simulate and calculate the velocity field and the degradation efficiency. The results showed that the folded-plate reactor can enlarge reaction area and UV incidence angle, balance mass transfer-reaction capability. Comparing with plate reactor, the degradation efficiencies in wide- angle and narrow-angle folded-plate reactors increase 50% and 90%, respectively. The computational fluid dynamics （CFD） simulation showed that the distribution of flow velocity is uniform in vertical direction and uneven in horizontal direction and surface of thin plate of the folded-plate reactor, affecting convective mass transfer effect. The simulation results are higher than testing data by 6.4%- 15.1%, however, their change trend is same. Moreover, the degradation efficiency will be decreased if the humidity is too high in reactor.