發(fā)布時(shí)間：2018-05-31 11:49

  本文選題：介質(zhì)阻擋放電等離子體 + 紫外差分吸收光譜��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：全球環(huán)境尤其是大氣環(huán)境的污染得到了世界各國(guó)的廣泛關(guān)注。在我國(guó),電廠排放的氣體污染物給大氣環(huán)境帶來了嚴(yán)重威脅,污染氣體的脫除及濃度監(jiān)測(cè)系統(tǒng)是目前的研究熱點(diǎn)。介質(zhì)阻擋放電(DBD)是常用的等離子體產(chǎn)生方式,在脫除污染氣體方面有廣闊的發(fā)展前景。本文以介質(zhì)阻擋放電等離子體脫除NO為研究方向,結(jié)合電廠CEMS系統(tǒng)中常用的紫外差分光譜測(cè)量技術(shù)(DOAS),進(jìn)行了相關(guān)的實(shí)驗(yàn)研究。根據(jù)DBD脫除NO反應(yīng)及DOAS測(cè)量原理設(shè)計(jì)了實(shí)驗(yàn)臺(tái)。使用多項(xiàng)式擬合和低通濾波的方法分離光譜的快變部分和慢變部分,并減小了測(cè)量誤差,在實(shí)驗(yàn)條件下得到了較為“純凈”的NO氣體吸收截面,用于其他實(shí)驗(yàn)中未知濃度的NO氣體的測(cè)量。利用DBD反應(yīng)器模擬煙氣中NO氣體的脫除實(shí)驗(yàn)。通過設(shè)定不同入口NO濃度、不同氣體流量、不同氣體溫度,添加不同濃度的Ar、SO2、O2的不同實(shí)驗(yàn)條件,利用DOAS測(cè)量技術(shù)得到了DBD脫除NO氣體的脫除效率。實(shí)驗(yàn)結(jié)果表明:隨著入NO濃度的增加,NO的脫除效率下降;混合氣體流量越大,流速越快,NO氣體的脫除效率越低;隨著氣體溫度的增加,DBD脫除NO的效率沒有明顯變化;Ar可以增強(qiáng)DBD反應(yīng)器的放電強(qiáng)度和NO氣體的脫除效率,Ar濃度越高,NO氣體的脫除效率越高;添加SO2降低了NO氣體的脫除效率,SO2濃度越高,NO脫除效率越低;O2的加入明顯抑制了NO的脫除,隨著O2濃度的增加,NO氣體的脫除效率顯著下降,但在Ar氣氛下下降趨勢(shì)并不明顯。論文最終實(shí)現(xiàn)了利用DOAS技術(shù)對(duì)DBD脫除NO的效率進(jìn)行了測(cè)量。作為應(yīng)用基礎(chǔ)研究,本文對(duì)改進(jìn)放電反應(yīng)器結(jié)構(gòu)、提高NO脫除效率有一定的參考價(jià)值,對(duì)未來進(jìn)行電廠氣體污染物的脫除、測(cè)量一體化的應(yīng)用研究有一定的現(xiàn)實(shí)意義。
[Abstract]:The pollution of the global environment, especially the atmospheric environment, has been concerned by many countries all over the world. In China, the emission of gas pollutants from power plants has brought a serious threat to the atmospheric environment, and the removal of polluting gases and the concentration monitoring system are the hot research topics at present. Dielectric Barrier discharge (DBD) is a common plasma generation method, which has a broad prospect in the removal of polluting gases. In this paper, the removal of no by dielectric barrier discharge (DBD) plasma is taken as the research direction, combined with the commonly used UV differential spectrum measurement technique in power plant CEMS system, the related experimental research has been carried out. The experimental bench was designed according to the reaction of DBD removal of no and the principle of DOAS measurement. Polynomial fitting and low-pass filtering are used to separate the fast and slowly varying parts of the spectrum, and the measurement error is reduced, and the absorption cross section of no gas is obtained under the experimental conditions. It is used to measure no gas with unknown concentration in other experiments. The experiment of no removal from flue gas was simulated by DBD reactor. By setting different experimental conditions of different inlet no concentration, different gas flow rate, different gas temperature and adding different concentration of Arsuch _ 2O _ 2, the removal efficiency of no _ 2 removal by DBD was obtained by using DOAS measurement technique. The experimental results show that the removal efficiency of no decreases with the increase of no concentration, and the faster the flow rate of mixed gas is, the lower the removal efficiency of no is. With the increase of gas temperature, there is no obvious change in the removal efficiency of no. Ar can enhance the discharge intensity of DBD reactor and the removal efficiency of no gas. The higher the concentration of ar is, the higher the removal efficiency of no gas is. The addition of SO2 reduced the removal efficiency of no gas the higher the concentration of so _ 2 was, the lower the removal efficiency of no was. The addition of O _ 2 significantly inhibited the removal of no. The removal efficiency of no gas decreased significantly with the increase of O _ 2 concentration, but the decreasing trend was not obvious in ar atmosphere. Finally, the efficiency of no removal by DBD is measured by DOAS technology. As a basic application research, this paper has certain reference value for improving the structure of discharge reactor and improving the removal efficiency of no, and has certain practical significance for the application research of gas pollutant removal and measurement integration in power plant 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)】：X773

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 馮銳;李永華;;NO氣體紫外差分吸收截面的測(cè)量[J];電力科學(xué)與工程;2016年05期

2 李�，|;王祖武;李萍;車W，

本文編號(hào)：1959549