本文選題：脈沖低溫等離子體 + 汞�。� 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：隨著社會(huì)的不斷發(fā)展和進(jìn)步,產(chǎn)生的醫(yī)療廢物、生活垃圾、危險(xiǎn)廢物日益增加,而這些廢物通常都是采用焚燒的方法處理。焚燒過程產(chǎn)生的煙氣中都包含有汞和二惡英,對(duì)于這兩種物質(zhì)的處理十分困難。目前普遍采用的活性炭吸附處理方法,處理成本高昂,給企業(yè)帶來了很大的壓力。因此開發(fā)高效、節(jié)能、環(huán)保的處理工藝對(duì)于汞和二惡英的控制具有非常重要的意義。本文通過研制高壓脈沖直流電源,采用線筒式脈沖低溫等離子體對(duì)汞和二惡英進(jìn)行協(xié)同控制,分別研究了脈沖低溫等離子體電源頻率和電壓對(duì)汞去除效果的影響,脈沖低溫等離子體電源頻率、電壓、O2含量、水蒸氣含量、1,2,4-三氯苯初始濃度、停留時(shí)間對(duì)1,2,4-三氯苯降解效果的影響及脈沖低溫等離子體對(duì)汞和1,2,4-三氯苯的同時(shí)降解效果。通過研究發(fā)現(xiàn):(1)隨著電壓和頻率的升高,汞和1,2,4-三氯苯的去除率都呈現(xiàn)逐漸變大的趨勢,表現(xiàn)出電壓和頻率越高去除效果越好;(2)不同的O2含量對(duì)1,2,4-三氯苯的去除效果影響較大,O2含量越高越有利于反應(yīng)器對(duì)1,2,4-三氯苯的去除;(3)水蒸氣的加入有利于提高1,2,4-三氯苯的去除率,但是隨著水蒸氣的加入,1,2,4-三氯苯的去除率呈現(xiàn)先增大后減小的趨勢,水蒸氣含量以6%-8%較為合適;(4)1,2,4-三氯苯的初始濃度低,在反應(yīng)器中停留時(shí)間長都是促進(jìn)降解率提高的重要因素。(5)在模擬煙氣中同時(shí)存在汞和1,2,4-三氯苯時(shí),反應(yīng)器對(duì)其都有較高的去除率。在實(shí)驗(yàn)室研究的基礎(chǔ)上,分別對(duì)貴州廢汞觸媒回收產(chǎn)生的含汞尾氣和寧波危廢焚燒產(chǎn)生尾氣進(jìn)行了現(xiàn)場中試實(shí)驗(yàn)。中試實(shí)驗(yàn)驗(yàn)證了脈沖低溫等離子結(jié)合陶瓷納米材料可以對(duì)汞實(shí)現(xiàn)97.8%的去除率,單一的脈沖低溫等離子體對(duì)二惡英的毒性當(dāng)量降解率可以達(dá)到62.6%。通過本次理論與實(shí)踐的相結(jié)合,為今后脈沖低溫等離子體在汞和二惡英協(xié)同控制領(lǐng)域的工業(yè)化應(yīng)用奠定了基礎(chǔ)。
[Abstract]:With the continuous development and progress of society, medical waste, domestic waste, hazardous waste are increasing, and these wastes are usually treated by incineration. Both mercury and dioxins are contained in the flue gas produced by incineration, so it is very difficult to deal with these two substances. The high cost of activated carbon adsorption treatment, which is widely used at present, brings great pressure to enterprises. Therefore, the development of efficient, energy-efficient, environmentally-friendly treatment process for mercury and dioxin control is very important. In this paper, the influence of frequency and voltage of pulse low temperature plasma on mercury removal was studied by developing a high voltage pulsed DC power supply, and using a linear pulsed low temperature plasma to control mercury and dioxin. The effects of pulse low temperature plasma power supply frequency, voltage O 2 content, water vapor content, initial concentration of 4trichlorobenzene and residence time on the degradation of 1g 2N 4 trichlorobenzene and the simultaneous degradation of mercury and 1o 2 O 4 trichlorobenzene by pulsed low temperature plasma. It was found that with the increase of voltage and frequency, the removal rates of mercury and 1-trichlorobenzene increased gradually. The higher the voltage and frequency, the better the removal efficiency.) the higher the O _ 2 content is, the better the removal efficiency is. The higher the O _ 2 content is, the more favorable the addition of water vapor is to the increase of 1 ~ (2 +) O ~ (2 +) -trichlorobenzene removal. Removal rate of trichlorobenzene, However, the removal rate of 4-trichlorobenzene increased at first and then decreased with the addition of water vapor, and the initial concentration of 4-trichlorobenzene was low with 6-8% water vapor content. Long residence time in the reactor is an important factor to promote the increase of degradation rate. 5) when mercury and 1o 2n 4- trichlorobenzene exist simultaneously in simulated flue gas, the reactor has a higher removal rate of mercury and trichlorobenzene. Based on the laboratory research, the field pilot-scale experiments were carried out on the tail gas containing mercury produced by the recovery of waste mercury catalyst in Guizhou province and the tail gas from Ningbo waste incineration. The experimental results show that the removal rate of mercury can be 97.8% by pulsed low-temperature plasma combined with ceramic nanomaterials, and the equivalent degradation rate of dioxin by a single pulsed low-temperature plasma can reach 62.6%. The combination of this theory and practice lays a foundation for the industrial application of pulsed low-temperature plasma in the field of synergistic control of mercury and dioxin in the future.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X701

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