本文選題：脫硝 + NH_3-SCR��； 參考：《華北電力大學(xué)》2015年碩士論文

【摘要】：近年來(lái)我國(guó)經(jīng)濟(jì)迅猛發(fā)展,但是大氣污染日益嚴(yán)重,已經(jīng)嚴(yán)重影響人們的正常生活。氮氧化物是大氣污染的主要組成部分之一,也是形成霧霾的主要原因。燃煤電廠是主要的氮氧化物排放源,燃煤電廠采用煙氣脫硝技術(shù)已經(jīng)成為我國(guó)火電發(fā)展的必然選擇。目前選擇性催化NH3-SCR法脫硝以其工藝可靠、效率高的優(yōu)勢(shì)已成為火力發(fā)電機(jī)組脫硝的主流技術(shù)。但是在實(shí)際運(yùn)行NH3-SCR脫硝中,還是存在一些問(wèn)題比如催化劑燒結(jié)、催化劑積灰、硫酸銨附著催化劑等,這些問(wèn)題都給火電廠的脫硝效率帶來(lái)了很大影響。隨著對(duì)選擇性催化NH3-SCR脫硝的深入研究,發(fā)現(xiàn)載體性能的不同會(huì)給相應(yīng)催化劑脫硝性能帶來(lái)較大的差異。本文利用水解法制備了納米Ti02,通過(guò)XRD、SEM等表征方法研究了納米Ti02隨著溫度升高逐漸由銳鈦礦轉(zhuǎn)變?yōu)榻鸺t石的實(shí)驗(yàn)過(guò)程中,晶相和形貌尺寸的具體變化規(guī)律。利用熔鹽法制備納米陶瓷粉體的技術(shù),合成了一種具有多孔結(jié)構(gòu)的納米Bi3NbTiO9陶瓷粉體。通過(guò)對(duì)合成的Bi3NbTiO9粉體TG-DTA、XRD、SEM、BET等表征結(jié)果的分析,來(lái)研究Bi3NbTiO9粉體的材料性能。將這兩種材料通過(guò)浸漬法分別制成了傳統(tǒng)V2O5-WO3/TiO2脫硝催化劑和新型V2O5-WO3/Bi3NbTiO9脫硝催化劑。利用自主搭建的脫硝試驗(yàn)臺(tái),通過(guò)催化劑脫硝性能評(píng)價(jià)實(shí)驗(yàn),對(duì)比了兩種催化劑在不同工況下脫硝性能的差異.發(fā)現(xiàn)新型V2O5-WO3/Bi3NbTiO9脫硝催化劑比V205-WO3/TiO2脫硝催化劑,在脫硝催化劑溫度窗口寬度、空速對(duì)脫硝催化劑催化活性的影響、氨氮比對(duì)脫硝催化劑的影響、催化劑比表面積的大小等脫硝性能指標(biāo)上具有較為明顯的優(yōu)勢(shì)；但是在抗SO2方面,V2O5-WO3/TiO2脫硝催化劑有更大的優(yōu)勢(shì)。結(jié)合釩系催化劑脫硝反應(yīng)機(jī)理,發(fā)現(xiàn)Bi3NbTiO9粉體強(qiáng)大的物理吸附能力是新型催化劑脫硝性能優(yōu)于傳統(tǒng)催化劑的主要原因。
[Abstract]:In recent years, China's economy has developed rapidly, but air pollution is becoming more and more serious, which has seriously affected people's normal life. Nitrogen oxide is one of the main components of air pollution and the main cause of smog. Coal-fired power plant is the main nitrogen oxide emission source. Flue gas denitrification technology has become the inevitable choice of thermal power development in China. At present, selective catalytic NH _ 3-SCR denitrification has become the mainstream technology of thermal power unit denitrification because of its reliable process and high efficiency. However, in the actual operation of NH3-SCR denitrification, there are still some problems, such as catalyst sintering, catalyst ash deposition, ammonium sulfate adhesion catalyst and so on. These problems have a great impact on the denitrification efficiency of thermal power plants. With the in-depth study of selective catalytic NH _ 3-SCR denitrification, it is found that the different performance of the support will bring great difference to the denitrification performance of the corresponding catalyst. In this paper, nanocrystalline Ti02 was prepared by hydrolysis method. The crystal phase and morphology of nano-Ti02 changed from anatase to rutile with the increase of temperature by means of XRD SEM and other characterization methods. A kind of nano-Bi3NbTiO9 ceramic powder with porous structure was synthesized by molten salt method. The properties of Bi3NbTiO9 powders were studied by analyzing the characterization results of the synthesized Bi3NbTiO9 powders. The traditional V _ 2O _ 5-WO3 / TIO _ 2 denitrification catalyst and the new V _ 2O _ 5-WO3 / Bi _ 3NbTiO _ 9 denitrification catalyst were prepared by impregnation method. The denitrification performance of the two catalysts under different operating conditions was compared by using an independent denitrification test rig and an evaluation experiment on the denitrification performance of the catalyst. It was found that a new type of V _ 2O _ 5-WO _ 3 / Bi _ 3NbTiO _ 9 denitrification catalyst was better than that of V _ 205-WO3 / TIO _ 2 denitrification catalyst. The effect of temperature window width and space velocity on the catalytic activity of denitrification catalyst and the effect of ammonia to nitrogen ratio on denitrification catalyst were found. The specific surface area of the catalyst has obvious advantages in denitrification performance, but the V _ 2O _ 5-WO3 / TIO _ 2 denitrification catalyst has more advantages in SO2 resistance. Combined with the mechanism of denitrification of vanadium catalyst, it is found that the strong physical adsorption ability of Bi3NbTiO9 powder is the main reason that the new catalyst has better denitrification performance than the traditional catalyst.
【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】：2015
【分類號(hào)】：TQ426;X773

【二級(jí)參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 馬建蓉,黃張根,劉振宇,郭士杰;再生方法對(duì)V_2O_5/AC催化劑同時(shí)脫硫脫硝活性的影響[J];催化學(xué)報(bào);2005年06期

2 王靜;沈伯雄;劉亭;田曉娟;;釩鈦基SCR催化劑中毒及再生研究進(jìn)展[J];環(huán)境科學(xué)與技術(shù);2010年09期

3 劉孜;易斌;高曉晶;井鵬;岳濤;莊德安;;我國(guó)火電行業(yè)氮氧化物排放現(xiàn)狀及減排建議[J];環(huán)境保護(hù);2008年16期

4 云端;鄧斯理;宋薔;姚強(qiáng);;V_2O_5-WO_3/TiO_2系SCR催化劑的鉀中毒及再生方法[J];環(huán)境科學(xué)研究;2009年06期

5 云端;宋薔;姚強(qiáng);;V_2O_5-WO_3/TiO_2 SCR催化劑的失活機(jī)理及分析[J];煤炭轉(zhuǎn)化;2009年01期

6 Hans Jensen-Holm;Nan-Yu Topsφe;崔建華;;選擇催化還原(SCR)脫硝技術(shù)在中國(guó)燃煤鍋爐上的應(yīng)用(上)[J];熱力發(fā)電;2007年08期

7 沈伯雄;熊麗仙;劉亭;王靜;田曉娟;;納米負(fù)載型V_2O_5-WO_3/TiO_2催化劑堿中毒及再生研究[J];燃料化學(xué)學(xué)報(bào);2010年01期

相關(guān)博士學(xué)位論文 前1條

1 李鋒;以納米TiO_2為載體的燃煤煙氣脫硝SCR催化劑的研究[D];東南大學(xué);2006年

，

本文編號(hào)：2021675