不同填充材料对介质阻挡放电降解SF6的实验研究

Experimental Study on the Degradation of SF6 by Dielectric Barrier Discharge with Different Packing Materials

SF6作为一种温室气体,其工业废气的回收和降解是环境领域的研究热点。该文基于双层介质阻挡放电(DBD)反应器,研究玻璃珠、γ-Al2O3颗粒填充和无填充体系下SF6的降解过程。结果表明,填充介质的加入能够改变反应器的物理参数,增加DBD放电过程的等效电容,提高放电功率。此外,两种填充介质的加入都可以有效地提高SF6的降解率(DRE)和能量效率(EY),在γ-Al2O3颗粒填充体系中,2%SF6在110W下最大降解率达到85.97%,能量效率达到9.17g/(kW·h),远超无填充的情况。两种填充介质的加入影响了SF6分解产物的产量。玻璃珠的加入对产物种类的影响不明显,而γ-Al2O3颗粒填充会导致SF6倾向于产生SO2,并抑制SOF2、SO2F2和SOF4的生成,同时SO2的产量随输入功率的增加而增加。γ-Al2O3颗粒填充在有效提高降解率和能量效率的同时,抑制SO2F2等难以处理的产物生成。以上结果表明,加入合适的填充介质如γ-Al2O3颗粒能够有效地促进SF6的无害化降解。

As a greenhouse gas,the recovery and degradation of SF6 industrial waste gas is a research hotspot in the field of environment.Based on the double-layer dielectric barrier discharge(DBD)reactor,the degradation process of SF6 with glass beads,γ-Al2O3 particles and no packing system was studied.The results show that the addition of packing materials can change the physical parameters of the reactor and increase the effective capacitance of DBD discharge process and discharge power.In addition,the degradation removal efficiency(DRE)and energy yield(EY)of SF6 can be effectively improved by adding two kinds of packing materials.In theγ-Al2O3 system,the maximum DRE of 2%SF6 was 85.97%at 110W,and the EY reached 9.17g/(kW·h),far exceeding the case of no packing.The addition of two kinds of packing materials affects the amount of SF6 decomposition products.The addition of glass beads has no obvious effect on the degradation product,while the packing ofγ-Al2O3 particles will make SF6 have a tendency to produce SO2 and inhibit the formation of SOF2,SO2F2 and SOF4.At the same time,the output of SO2 increases with the increase of input power.γ-Al2O3 particle packing can effectively improve DRE and EY while inhibiting the formation of refractory products such as SO2F2.The results show that adding suitable packing materials such asγ-Al2O3 particles can effectively promote the harmless degradation of SF6.