本文選題：滑動弧放電 + 煙氣脫硫��； 參考：《西安理工大學》2017年碩士論文

【摘要】：由于經濟的迅速發(fā)展,電力市場的需求逐日增長,煤炭消耗量亦與日遞增。燃煤電廠在發(fā)電過程中會產生大量大氣污染物如SO_2, SO_2是導致酸雨形成的重要誘因�？刂迫济弘姀S煙氣污染物排放對環(huán)境治理有著重要的意義。利用等離子體技術脫硫具有投資小,,占地面積小,處理效率高等優(yōu)點,受到了世界各國科學家的關注�；瑒踊》烹娛且环N新型等離子體,因其兼具冷、熱等離子體特性,能提供大量的高能電子和活性自由基,而被廣泛研究應用于廢氣處理與煙氣凈化領域。木文首先選取SO_2為研究對象,改變實驗條件如放電功率,氣體流速,相對濕度,SO_2初始濃度等參數,研究不同的放電工況對處理效果的影響。實驗結果表明:提高放電功率能夠提高SO_2的去除率,放電功率的提高增大了放電區(qū)域的能量輸入,增強了放電等離子體區(qū)域的電場,提高了放電區(qū)域活性粒子的數量和強度;氣體流速越大,去除率越低,氣流量的增大導致反應氣的流速變快,氣體在等離子體反應區(qū)域內的停留時間縮短,造成部分氣體得不到充分反應就離開了等離子體區(qū)域,因而降解率隨之下降;在低于飽和濕度的范圍內,提高反應環(huán)境的相對濕度有利于提高SO_2的去除率。OH基團與SO_2之間的反應在整個去除過程中起關鍵作用。SO_2去除率隨初始濃度的增加而降低,但能量利用率是提高的。在實際投入工業(yè)應用時,也應該考慮能量利用率的大小,尋求二者的一個交叉點,作為最佳初始濃度。為了提高氣液兩相滑動弧放電對火電廠廢氣的處理效率,將傳統(tǒng)的純水液相替換成NaOH溶液。通過觀測放電過程中的電壓-電流波形和發(fā)射光譜,研究加入NaOH對滑動弧放電的電氣特性和光學特性的影響。選取SO_2作為待處理廢氣,對比分析NaOH溶液、純水液相下SO_2的去除率以及產物濃度隨處理時間、氣體流速的變化情況,以及NaOH溶液濃度對SO_2去除結果的影響。實驗結果表明,相同條件下,NaOH溶液代替純水液相協強了氣液兩相放電強度,電離出更為大量的OH自由基;同時,NaOH的加入使SO_2的去除率提高了 5%～7%,產物中的SO_3含量較純水液相時降低了 50%左右。實驗結果表明,本文研究的氣液兩相滑動弧放電等離子體對于火電廠脫硫具有較高的效率。在工業(yè)污染物控制方面具有廣闊的發(fā)展前景。本文的研究工作提出了一種火電廠污染物處理的新途徑,為其今后在火電廠污染物處理領域的應用奠定了理論基礎。
[Abstract]:With the rapid development of economy, the demand of electricity market increases day by day, and the consumption of coal increases day by day. A large number of atmospheric pollutants such as so _ 2s can be produced in coal-fired power plants. So _ 2s _ 2 is an important cause of acid rain formation. Controlling the emission of flue gas pollutants from coal-fired power plants is of great significance to environmental control. Desulfurization by plasma technology has attracted the attention of scientists all over the world for its advantages of small investment, small area, high treatment efficiency and so on. Sliding arc discharge is a new type of plasma, which is widely used in waste gas treatment and flue gas purification because of its characteristics of cold and thermal plasma, which can provide a large number of high energy electrons and active free radicals. At first, so _ 2 is selected as the research object. The experimental conditions such as discharge power, gas flow rate and initial concentration of so _ 2 are changed to study the effect of different discharge conditions on the treatment effect. The experimental results show that increasing the discharge power can increase the removal rate of SO2, increase the discharge power, increase the energy input in the discharge region, enhance the electric field in the discharge plasma region, and increase the number and intensity of active particles in the discharge region. The higher the gas flow rate, the lower the removal rate, the higher the gas flow rate, the faster the reaction gas flow rate, the shorter the residence time of the gas in the plasma reaction region, and the less sufficient reaction of some gases to leave the plasma region. As a result, the degradation rate decreases; in a range below saturated humidity, Increasing the relative humidity of the reaction environment is beneficial to increase the removal rate of SOS _ 2. The reaction between the OH group and so _ 2 plays a key role in the whole removal process. The removal rate of so _ 2 decreases with the increase of initial concentration, but the energy utilization rate is increased. In practical industrial application, the energy utilization ratio should also be taken into account, and an intersection of the two should be found as the optimal initial concentration. In order to improve the efficiency of gas-liquid two-phase sliding arc discharge in treating waste gas from thermal power plant, the traditional pure water liquid phase was replaced with NaOH solution. The effects of NaOH on the electrical and optical properties of sliding arc discharge were studied by observing the voltage-current waveforms and emission spectra during the discharge. So _ 2 was chosen as the waste gas to be treated. The removal rate of so _ 2 in pure water liquid phase and the change of product concentration with treatment time, gas flow rate and the effect of NaOH solution concentration on the removal of so _ 2 were compared and analyzed. The experimental results show that under the same conditions, the gas-liquid two-phase discharge intensity is strengthened in the presence of NaOH solution instead of pure water, and a large amount of OH free radicals are ionized. At the same time, the addition of NaOH increased the removal rate of SO2 by 5%, and the content of SO3 in the product decreased by about 50% compared with that in pure water liquid phase. The experimental results show that the gas-liquid two-phase sliding arc discharge plasma has a high efficiency for desulfurization in thermal power plants. It has a broad prospect in industrial pollutant control. In this paper, a new approach to pollutant treatment in thermal power plants is proposed, which lays a theoretical foundation for its application in the field of pollutant treatment in thermal power plants in the future.
【學位授予單位】：西安理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM621;X773

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