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为研究DBD低温等离子体协同催化反应器中催化剂颗粒直径对放电功率和NOx脱除率影响规律,分别将五种不同颗粒直径的催化剂装入相同条件的反应器中,通过变压器改变交流电源输入电压,用功率表测定不同电压条件下的输入功率,用数字示波器测试放电电压以及Lissajous图像并计算放电功率,用气体在线检测装置测试反应器进出口浓度计算NOx脱除率。实验发现随催化剂颗粒直径增加放电电能和NOx脱除率先增大再减小,有最大峰值;随着输入电压增加催化剂颗粒直径对放电电能和NOx脱除率的影响进一步增大。在本实验研究中催化剂最佳颗粒直径在4mm左右,当输入电压为40 kV时,最大有效放电能量和NOx脱除效率分别为29.3W和76.67%。该结论可为DBD协同催化反应过程中选择适宜催化剂颗粒直径提供理论依据。
In order to study the influence of catalyst particle diameter on discharge power and NOx removal rate in DBD low temperature plasma synergistic catalysis reactor, five kinds of catalysts with different particle diameters were loaded into reactors of the same conditions respectively, and the AC input voltage , Using a power meter to measure the input power under different voltage conditions, using a digital oscilloscope to test the discharge voltage and Lissajous images and calculating the discharge power, and using the on-line gas detector to measure the reactor inlet and outlet concentration to calculate the NOx removal rate. It was found that the discharge energy and NOx removal rate increased firstly and then decreased with the increase of the catalyst particle diameter, and reached the maximum peak value. With the increase of the input voltage, the influence of catalyst particle diameter on the discharge energy and NOx removal rate further increased. In this experimental study, the optimum particle diameter of the catalyst was about 4 mm. When the input voltage was 40 kV, the maximum effective discharge energy and NOx removal efficiency were 29.3 W and 76.67%, respectively. This conclusion can provide a theoretical basis for selecting the suitable catalyst particle diameter during the synergistic catalysis reaction of DBD.