本文關(guān)鍵詞： 低溫等離子體 介質(zhì)阻擋放電 脫硫機(jī)理 反應(yīng)器結(jié)構(gòu) 電場(chǎng)分析 實(shí)驗(yàn)研究　出處：《武漢紡織大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：圍繞國(guó)家節(jié)能減排政策,新型高效率脫硫脫硝技術(shù)的開(kāi)發(fā)研究是當(dāng)務(wù)之急。低溫等離子體是一種有效的脫硫脫硝技術(shù),但還需從降低能耗和提高效率等實(shí)用角度出發(fā),進(jìn)行深入系統(tǒng)的研究。論文以低溫等離子體脫硫?yàn)檠芯繉?duì)象,針對(duì)其脫硫機(jī)理、反應(yīng)器組成和內(nèi)部電場(chǎng)、脫硫特性等三方面進(jìn)行了探索,以期為進(jìn)一步深入研究合適的實(shí)用等離子體脫硫技術(shù)提供參考。本文所做主要工作及取得的成果如下:(1)結(jié)合文獻(xiàn)對(duì)等離子體脫硫機(jī)理進(jìn)行了分析,得出:低溫等離子體脫除SO2有還原途徑和氧化途徑兩條,其中氧化途徑是脫除SO2的主要路徑;在氧化途徑中,SO2被O、OH等活性自由基氧化,進(jìn)而被脫除。(2)對(duì)等離子體反應(yīng)器結(jié)構(gòu)組成進(jìn)行了分析,比較了兩種典型的介質(zhì)阻擋放電結(jié)構(gòu)形式,綜合分析它們的加工制作過(guò)程和工作時(shí)所需的電壓,選擇了同軸圓柱結(jié)構(gòu)的介質(zhì)阻擋放電反應(yīng)器;絕緣介質(zhì)層是反應(yīng)器的重要組成部分,其應(yīng)具備一些特殊的性能,通過(guò)比較各種常見(jiàn)介質(zhì)材料的性能,選擇了石英玻璃管作為本實(shí)驗(yàn)的介質(zhì)材料。(3)對(duì)等離子體反應(yīng)器內(nèi)部電場(chǎng)進(jìn)行了分析,反應(yīng)器上的電壓越大,產(chǎn)生的電場(chǎng)強(qiáng)度越強(qiáng),氣體更容易被擊穿,通過(guò)理論研究了反應(yīng)器最小擊穿電壓與內(nèi)電極半徑的關(guān)系,確定了內(nèi)電極半徑的值。同時(shí),通過(guò)實(shí)驗(yàn)研究了氣體在反應(yīng)器內(nèi)的停留時(shí)間與脫除率的關(guān)系,確定了外電極銅網(wǎng)的長(zhǎng)度。(4)搭建等離子體脫硫?qū)嶒?yàn)系統(tǒng)并進(jìn)行了多因素影響下的等離子體脫硫?qū)嶒?yàn)研究,得到如下結(jié)論:等離子體電源特性對(duì)脫除SO2有促進(jìn)作用,增大電壓或提高頻率均能在一定程度上減少SO2的排放,提高煙氣凈化效率;隨著O2濃度增大和H2O的加入,SO2脫除率逐漸增大;當(dāng)O2和H2O共同作用時(shí),SO2脫除率均高于O2和H2O單獨(dú)作用;接入Ca(OH)2尾氣吸收劑,開(kāi)等離子體前,大部分SO2已被吸收,開(kāi)等離子體后,無(wú)論配氣系統(tǒng)中加入O2,還是H2O,還是O2和H2O一起加入,SO2脫除率都為100%。
[Abstract]:Around the national policy of energy saving and emission reduction, it is urgent to develop and study the new high efficiency desulfurization and denitrification technology. Low temperature plasma is an effective desulphurization and denitrification technology. However, it is necessary to study deeply and systematically from the point of view of reducing energy consumption and improving efficiency. This paper takes low temperature plasma desulphurization as the research object, aiming at its desulfurization mechanism, reactor composition and internal electric field. Desulphurization characteristics were explored in three aspects. In order to provide a reference for the further study of suitable practical plasma desulfurization technology. The main work and results obtained in this paper are as follows: 1) the mechanism of plasma desulfurization is analyzed in combination with literature. It is concluded that there are two reduction and oxidation pathways for SO2 removal by low temperature plasma, among which oxidation pathway is the main way to remove SO2. The structure composition of plasma reactor was analyzed by oxidation of so _ 2 by active free radicals such as OOOH and then removed. Two typical dielectric barrier discharge (DBD) structures were compared. The dielectric barrier discharge (DBD) reactor with coaxial cylindrical structure is selected by synthetically analyzing the process of fabrication and the voltage required when they are working. Insulating dielectric layer is an important part of the reactor, it should have some special properties, by comparing the performance of a variety of common dielectric materials. The internal electric field of plasma reactor is analyzed by using quartz glass tube as the dielectric material of this experiment. The larger the voltage in the reactor, the stronger the electric field intensity produced and the more easily the gas can be broken down. The relationship between the minimum breakdown voltage of the reactor and the radius of the inner electrode was studied theoretically, and the value of the radius of the inner electrode was determined. At the same time, the relationship between the residence time of gas in the reactor and the removal rate was studied experimentally. The length of external electrode copper net was determined. (4) the experimental system of plasma desulfurization was set up and the experimental study of plasma desulphurization was carried out under the influence of many factors. The conclusions are as follows: the characteristics of plasma power supply can promote the removal of SO2, increasing the voltage or frequency can reduce the emission of SO2 to a certain extent and improve the efficiency of flue gas purification. The removal rate of so _ 2 increases with the increase of O _ 2 concentration and H _ 2O addition. When O _ 2 and H _ 2O work together, the removal rate of so _ 2 is higher than that of O _ 2 and H _ 2O alone. When the Ca(OH)2 tail gas absorbent is connected, most of the SO2 has been absorbed before the plasma is opened. After the plasma is opened, O _ 2 or H _ 2O are added to the gas distribution system. The removal rate of so _ 2 by adding O _ 2 and H _ 2O is 100%.
【學(xué)位授予單位】：武漢紡織大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：X701.3

【參考文獻(xiàn)】

相關(guān)期刊論文 前3條

1 周波;林文峰;余剛;楊宏e，

本文編號(hào)：1447178