【摘要】：煤炭是我國第一大能源資源,極大地推動著經(jīng)濟和社會的發(fā)展,然而工業(yè)生產(chǎn)造成的環(huán)境污染也日益凸顯,尤其是氮氧化物污染問題。為減少工業(yè)鍋爐氮氧化物排放,本文采用尿素為還原劑,以自制的單元體爐模擬工業(yè)鍋爐進行SNCR脫硝技術(shù)實驗研究。本文首先對尿素的熱解特性進行了實驗研究和分析,結(jié)果表明尿素?zé)峤饪煞譃樗膫�階段,生成的氣體產(chǎn)物為NH3和HNCO, NHs的回收率高于HNCO。在此基礎(chǔ)上,采用單元體爐進行SNCR脫硝特性研究,主要考察了溫度、NSR、氧濃度和不同還原劑對脫硝效果的影響。實驗結(jié)果表明尿素脫硝的最佳脫硝溫度925℃,最大脫硝效率81%,脫硝溫度窗口150℃(875～1025℃),最優(yōu)NSR為1.5,最佳φ(02)=2%,氨水整體脫硝特性優(yōu)于尿素。但由于尿素物理性能等優(yōu)勢,具有更好的工業(yè)應(yīng)用前景。最后考察H2O2、Na2CO3、C2H5OH三種添加劑對NOxOUT脫硝特性的影響。結(jié)果表明三種添加劑均能提高低溫區(qū)間OH活性根濃度,從而提高其脫硝效率,并拓寬脫硝溫度窗口,C2H5OH拓寬效果最好并使得最佳脫硝溫度向低溫方向偏移25℃；三種添加劑降低低溫區(qū)間氨漏失量程度由大到小依次為Na2CO3、C2H5OH、H2O2;C2H5OH大幅增加低溫段CO排放濃度；微量添加劑即可明顯改善NOxOUT的脫硝效果；三種添加劑中,Na2CO3改善脫硝效果的優(yōu)勢明顯。
[Abstract]:Coal is the largest energy resource in China, which greatly promotes the development of economy and society. However, the environmental pollution caused by industrial production is increasingly prominent, especially the problem of nitrogen oxide pollution. In order to reduce nitrogen oxide emissions from industrial boilers, SNCR denitrification technology was studied by using urea as reducing agent and a self-made unit furnace to simulate industrial boilers. In this paper, the pyrolysis characteristics of urea are studied and analyzed experimentally. The results show that the pyrolysis of urea can be divided into four stages. The gas products produced are NH3 and HNCO.The recovery rate of NHs is higher than that of HNCO. On this basis, the characteristics of SNCR denitrification were studied in a unit furnace. The effects of temperature, oxygen concentration and different reductants on denitrification were investigated. The experimental results show that the optimum denitrification temperature of urea denitrification is 925 鈩，

本文編號：2150726