本文選題：SCR + 催化劑��； 參考：《華北電力大學(xué)》2017年碩士論文

【摘要】：選擇性催化還原法(SCR)是至今脫除煙氣中氮氧化物最成熟最有效的方法,催化劑作為整個(gè)SCR脫硝系統(tǒng)的核心,其性能的好壞直接關(guān)系到了整體脫硝效率的高低。然而催化劑長(zhǎng)時(shí)間的使用便會(huì)造成催化劑堵塞燒結(jié)以及催化劑中毒等,在這些影響中,重金屬中毒也是不可忽視的重要因素。本文著重于脫硝催化劑重金屬鉛、砷中毒及其再生技術(shù)的研究。脫硝催化劑鉛中毒及其再生:失活部分,分別配比不同濃度的醋酸鉛作為前驅(qū)體溶液浸漬于新鮮催化劑中來(lái)模擬電廠催化劑中毒,并通過(guò)搭建催化劑評(píng)價(jià)裝置實(shí)驗(yàn)臺(tái),來(lái)測(cè)不同溫度、氨氮比、負(fù)載量、鉛/釩摩爾比等對(duì)脫硝性能的影響。再生部分,選取上述最佳實(shí)驗(yàn)反應(yīng)條件和鉛/釩摩爾比對(duì)脫硝性能影響較大較為明顯的一組,分別通過(guò)水洗、酸洗、絡(luò)合物清洗以及結(jié)合混洗的方式來(lái)進(jìn)行實(shí)驗(yàn)研究,得出:在再生鉛中毒的催化劑時(shí),水洗是必不可少的首選方法;酸洗中醋酸有較為明顯的效果;選擇的幾種絡(luò)合物中,二乙烯三胺和三乙烯四胺的再生效果明顯,相對(duì)的三乙烯四胺效果更好;混合水、醋酸以及三乙烯四胺清洗的方法效果最好,脫硝效率幾乎能夠達(dá)到原來(lái)新鮮催化劑的94.05%。脫硝催化劑砷中毒及其再生:失活部分,分別配比不同濃度的砷標(biāo)液作為前驅(qū)體溶液浸漬于新鮮催化劑中來(lái)模擬電廠催化劑中毒,并通過(guò)搭建催化劑評(píng)價(jià)裝置實(shí)驗(yàn)臺(tái),來(lái)測(cè)不同溫度、氨氮比、負(fù)載量、砷/釩摩爾比等對(duì)脫硝性能的影響。再生部分,選取上述最佳實(shí)驗(yàn)反應(yīng)條件和砷/釩摩爾比對(duì)脫硝性能影響較大較為明顯的一組,分別通過(guò)水洗、酸洗、堿性化合物清洗以及結(jié)合混洗的方式來(lái)進(jìn)行實(shí)驗(yàn)研究,得出:在再生砷中毒的催化劑時(shí),水洗是必不可少的首選方法;酸洗中醋酸有較為明顯的效果;選擇的幾種堿性化合物中,硝酸鈉和碳酸鈉的再生效果明顯,相對(duì)的碳酸鈉的效果更好;混合水、醋酸以及碳酸鈉清洗的方法效果最好,脫硝效率幾乎能夠達(dá)到原來(lái)新鮮催化劑的93.13%。
[Abstract]:The selective catalytic reduction method is the most mature and effective method to remove nitrogen oxides from flue gas. As the core of the whole SCR denitrification system, the performance of the catalyst is directly related to the overall denitrification efficiency. However, the use of catalyst for a long time will lead to catalyst blocking and sintering and catalyst poisoning, among which heavy metal poisoning is also an important factor that can not be ignored. This paper focuses on heavy metal lead, arsenic poisoning and regeneration of denitrification catalyst. Lead poisoning of denitrification catalyst and its regeneration: deactivation part, different concentrations of lead acetate were mixed separately as precursor solution impregnated in fresh catalyst to simulate the catalyst poisoning in power plant, and the experimental bench was set up to evaluate the catalyst. The effects of different temperature, ammonia / nitrogen ratio, loading amount and lead / vanadium molar ratio on denitrification performance were measured. In the regeneration part, the optimum reaction conditions and the ratio of lead to vanadium were selected to study the effects of water washing, acid cleaning, complex cleaning and combined washing respectively on the denitrification performance. It is concluded that water washing is the first choice for regenerating lead poisoning catalyst, acetic acid has obvious effect in acid pickling, and the regeneration effect of diethylenetriamine and triethylenetetramine is obvious among the selected complexes. The effect of mixed water acetic acid and triethylenetetramine cleaning method is the best and the denitrification efficiency can almost reach 94.05 of the original fresh catalyst. Arsenic poisoning of denitrification catalyst and its regeneration: deactivation part, different concentrations of arsenic standard solution were mixed separately as precursor solution to impregnate in fresh catalyst to simulate catalyst poisoning in power plant, and the experimental bench was set up to evaluate the catalyst. The effects of different temperature, ammonia / nitrogen ratio, loading amount and molar ratio of arsenic to vanadium on denitrification performance were measured. In the regeneration part, the optimum reaction conditions and the molar ratio of arsenic to vanadium were selected to study the effects of water washing, acid washing, alkaline compound cleaning and combined washing respectively. It is concluded that water washing is the first choice in the regeneration of arsenic poisoning catalyst, acetic acid has obvious effect in acid pickling, and sodium nitrate and sodium carbonate have obvious regeneration effect in the selected basic compounds. Compared with sodium carbonate, the cleaning method of mixed water, acetic acid and sodium carbonate is the best, and the denitrification efficiency can almost reach 93.1313 of the original fresh 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】：2017
【分類號(hào)】：X773

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本文編號(hào)：1970831