船舶尾氣臭氧氧化脫硝實驗研究
本文關(guān)鍵詞：船舶尾氣臭氧氧化脫硝實驗研究 出處：《大連海事大學(xué)》2017年碩士論文 論文類型：學(xué)位論文
【摘要】：目前,由于船舶尾氣中含有大量的硫氧化物(SO_x)、氮氧化物(NO_x)、顆粒物(PM)等多種污染物,造成了日益嚴(yán)重的大氣污染問題。國際海事組織制定并通過了MARPOL73/78公約附則VI,對廢氣中NOx濃度設(shè)定了明確的限值要求。為了滿足排放標(biāo)準(zhǔn),人們提出了選擇性催化還原(SCR)、廢氣再循環(huán)(EGR)、濕法洗滌氧化、臭氧(O_3)氧化等多種不同的船舶尾氣脫硝方法。其中O_3氧化方法具有脫硝效率高、原理簡單等特點,具有良好的應(yīng)用前景。本文初步研究了 O_3自分解特性,進而開展了 O_3氧化脫硝實驗研究,最后初步研究了濕法洗滌對O_3氧化脫硝性能的影響及其作用機理。首先,實驗研究了 O_3自分解特性。結(jié)果表明,煙氣溫度是影響O_3自分解的主要因素,隨著煙氣溫度的升高,O_3自分解率增加。其中當(dāng)溫度小于100℃時,O_3自分解率緩慢增加,而當(dāng)溫度大于200 ℃時,O_3自分解率明顯增加。當(dāng)煙氣溫度為100 ℃時,隨煙氣停留時間的增加,O_3自分解率緩慢增加,不同O_3濃度對應(yīng)的O_3自分解率的變化趨勢基本一致。其次,實驗研究了 O_3氧化脫硝性能,并分析了相關(guān)反應(yīng)機理。結(jié)果表明,隨O_3/NO摩爾比的增加,NO氧化率明顯增加。當(dāng)O_3/NO摩爾比≥1時,NO氧化率為100%。當(dāng)O_3/NO摩爾比為1時,煙氣停留時間對NO氧化率無明顯影響。當(dāng)煙氣中有NO和SO_2同時存在時,SO_2對NO氧化率有一定的抑制作用,當(dāng)O_3/NO摩爾比為1、SO_2濃度為1000 ppm時,NO氧化率只達到90%,而SO_2去除率為4%。最后,研究了濕法洗滌對O_3氧化脫硝性能的影響,分別開展了 NaC1O_2、NaClO、H2O_2協(xié)同O_3氧化脫硝實驗,綜合考慮選取NaClO較為合適。然后分別考察了 O_3濃度、NaClO溶液pH值、有效氯濃度對NO氧化率的影響。當(dāng)NaClO溶液pH值為7時,增加O_3濃度和NaClO有效氯濃度,可以明顯提高NO氧化率。由于NaClO溶液中有效氯成分比例隨溶液pH值變化而變化,pH值對NaClO溶液濕法脫硝性能影響較大。當(dāng)O_3濃度為300 ppm、NaClO有效氯濃度為10 mmol/L時,pH值3、7、11所對應(yīng)的NO氧化率分別為100%、96%和67%。實驗兼顧考慮溶液的酸堿腐蝕問題和脫硝率,建議采用pH值為7的NaClO溶液與O_3協(xié)同開展后續(xù)研究。
[Abstract]:At present, due to large amounts of sulfur oxides in exhaust gas containing vessel (SO_x), nitrogen oxide (NO_x), particulate matter (PM) and other pollutants, causing air pollution problems have become increasingly serious. The international maritime organization adopted MARPOL73/78 annex VI, NOx concentration in the exhaust gas set clear limits. In order to meet emission standards, people put forward the selective catalytic reduction (SCR), exhaust gas recirculation (EGR), washing wet oxidation, ozone (O_3) denitration method of ship exhaust oxidation different. Oxidation method in which O_3 has high denitration efficiency, simple in principle, it has a good application prospect. This paper makes a preliminary study the O_3 self decomposition characteristics, and then carry out O_3 oxidation denitration experiments, finally studied the wet scrubbing of O_3 oxidation affect denitrification performance and its mechanism. Firstly, the experimental study on the self decomposition of O_3 were investigated. Show that the gas temperature is the main factor affecting the self decomposition of O_3, with the increase of the flue gas temperature, O_3 decomposition rate increased. When the temperature is less than 100 DEG C, O_3 decomposition rate increased slowly, and when the temperature is greater than 200 DEG C, O_3 decomposition rate increased significantly. When the flue gas temperature is 100 degrees centigrade with gas residence time increases, O_3 decomposition rate increased slowly, the change trend of different concentration of O_3 corresponding to the O_3 since the decomposition rate is basically the same. Secondly, experimental study on the oxidation of O_3 DeNOx performance, the reaction mechanism and analysis. The results show that with the increase of O_3/NO molar ratio, NO oxidation rate increased significantly. When the molar ratio of O_3/NO aged 1, NO oxidation rate is 100%. when the O_3/NO molar ratio is 1, the residence time of flue gas on NO oxidation rate was not affected. When there are NO and SO_2 in the flue gas existing at the same time, SO_2 has inhibitory effects on NO oxidation rate when O_3/NO mole ratio was 1, SO_2 The concentration of 1000 ppm, NO oxidation rate only reached 90%, and the removal rate of SO_2 is 4%. finally, studied the effect of wet scrubbing on denitrification performance of O_3 oxidation, respectively by NaC1O_2, NaClO, H2O_2, O_3 CO oxidation denitration experiments, considering the selection of NaClO is chosen. Then the effects of the concentration of O_3, NaClO the pH value of the solution, effects of effective chlorine concentration on the oxidation rate of NO. When the NaClO and the pH value is 7, the increase of O_3 concentration and NaClO concentration of effective chlorine, can significantly improve the NO oxidation rate. Changes due to the effective chlorine NaClO solution composition with solution pH value change, pH value of NaClO solution wet denitration performance greater impact. When the O_3 concentration is 300 ppm, NaClO effective chlorine concentration was 10 mmol/L, NO oxidation pH value 3,7,11 corresponding rates were 100%, 96% and 67%. experiment considering acid-base corrosion problem solution and the rate of denitrification, recommends the use of the pH value of 7 NaClO solution and O_3 Carry out follow-up research in collaboration.
【學(xué)位授予單位】：大連海事大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U664.9;X736.3
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