废弃荧光灯管处理过程中含汞废气处理技术研究

发布时间：2018-06-06 23:11

本文选题：脉冲低温等离子体 + 汞　；参考：《华北电力大学》2017年硕士论文

【摘要】：本文通过研发设计脉冲低温等离子体电源研发和反应器设计,进行低温等离子体处理含汞废气的实验研究,重点研究了电源参数(放电频率、放电电压)、烟气在反应器中的停留时间对单质汞氧化率的影响,同时研究了模拟烟气中O2含量、HCl添加量对脱汞效果的影响,并以此分析脉冲低温等离子体脱汞技术的作用机理,并应用于废弃荧光灯管回收资源化处置工程应用中。实验研究结果表明:1)放电电压高于8KV时,等离子体对单质汞有明显氧化效果,且电压越高,处理效果越好,但高电压下容易被击穿;而随着放电频率的增加,单质汞浓度迅速下降;峰值电压9KV、放电频率400Hz时氧化效果最经济。2)随着单质汞初始浓度增加,处理效率先增后减,Hg0初始浓度为253.4μg/m3时,Hg0氧化效率最高。3)停留时间越长,反应越充分,停留时间高于7s时,氧化率达到91.65%。4)O2、HCl单组分对单质汞氧化有促进作用。O2的效果相比于HCl明显。0%O2/0%Cl2氛围的氧化率为0,20%O2/0ppm C l2氛围的氧化率高达71.65%,而20%O2/100ppm C l2氛围的氧化率仅提高至86.73%。本文对实际工程废弃荧光灯管处理过程的含汞废气脱除进行现场中试实验,通过改变电源电压及频率,实现Hg0氧化率和HgT去除率分别达88.84%和92.9%,证明了脉冲低温等离子体脱汞技术具有一定的经济效益、环境效益和社会效益,可以替代MRT工艺的尾气处理系统。
[Abstract]:Through the research and development of pulsed low-temperature plasma power supply and reactor design, the experimental study on the treatment of mercury-containing waste gas by low-temperature plasma was carried out in this paper, and the power parameters (discharge frequency, discharge frequency) were studied emphatically. The effect of discharge voltage and residence time of flue gas in reactor on the oxidation rate of elemental mercury was studied. The effect of O _ 2 content and HCl addition on mercury removal efficiency was studied, and the mechanism of pulsed low-temperature plasma mercury removal technology was analyzed. It is applied to waste fluorescent lamp tube recycling and disposal engineering application. The experimental results show that when the discharge voltage is higher than that of 8KV, the plasma has obvious oxidation effect on elemental mercury, and the higher the voltage, the better the treatment effect, but the higher the voltage, the easier it is to be broken down, and with the increase of discharge frequency, The peak voltage of 9 KV and the most economical oxidation efficiency at discharge frequency of 400Hz increased with the increase of initial concentration of mercury, the treatment efficiency increased first and then decreased when the initial concentration of Hg _ 0 was 253.4 渭 g/m3. The maximum oxidation efficiency of Hg _ (0) increased with the increase of the initial concentration of Hg _ (0), and the maximum oxidation efficiency of Hg _ (0). 3) the residence time was longer when the initial concentration of Hg _ (0) was 253.4 渭 g/m3. The more sufficient the reaction, the longer the residence time is higher than 7 s, The oxidation rate reached 91.65%. 4% O2HCl promoted the oxidation of mercury. O 2 compared with HCl. 0O 2 / 0 Cl 2 oxidation rate was 71.65% in 020 O 2 / 0 ppm Cl 2 atmosphere, while the oxidation rate in 20%O2/100ppm CL 2 atmosphere only increased to 86.73%. In this paper, the field pilot-scale experiment is carried out on the removal of mercury containing waste gas from waste fluorescent lamp tubes in practical engineering. By changing the power supply voltage and frequency, The oxidation rate of Hg0 and the removal rate of HgT are 88.84% and 92.9% respectively. It is proved that the pulsed low-temperature plasma mercury removal technology has certain economic benefits, environmental benefits and social benefits, and can replace the tail gas treatment system of MRT process.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X701

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