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Combustion behavior, emission characteristics of SO2, SO3 and NO, and in situ control of SO2 and NO during the co-combustion of anthracite and dried sawdust sludge
Science of the Total Environment ( IF 8.2 ) Pub Date : 2018-07-25 , DOI: 10.1016/j.scitotenv.2018.07.286
Zili Zhang , Qinda Zeng , Runlong Hao , Hongzhou He , Fan Yang , Xingzhou Mao , Yumin Mao , Peng Zhao

The combustion behaviors of anthracite and dried sawmill sludge (DSS) were studied using thermogravimetric analysis (TGA) and derivative thermogravimetric analysis (DTG). DSS was found to be a promoter for anthracite combustion, the addition of DSS in anthracite decreased the burnout temperature and time. But DSS caused the rapid releases of SO2 and NO in the initial combustion stage. In overall, the increasing of DSS significantly decreased the emission factor of SO2 from 13.42 ± 1.80 to 0.31 ± 0.08 g/kg; while the emission factor of NO was not obviously changed and stable at 0.7–0.8 g/kg in all cases. The oxygen-rich atmosphere was helpful for the rapid and sufficient combustion of blend; the oxygen-lean atmosphere delayed the combustion process and slowed down the releases of SO2 and NO. The increasing combustion temperature improved the anthracite combustion, and the emission factors of SO2 and NO were all increased with the temperature increasing. 900 °C was found to be the best combustion temperature for NO generation. SO3 was detected in the combustion of anthracite under 21% and 30% of O2. Two promising ways for control of SO2 and NO were provided: 1) urea-fuel mixture combustion combined with the post-combustion wet absorption by Na2CO3; 2) post-combustion wet absorption by NaClO/Na2CO3. The removal efficiencies of SO2 and NO could reach 100% and over 95% respectively. The removal products were determined as sulfate, sulfite and nitrate by IC, with no toxic byproducts being produced.



中文翻译:

燃烧行为,SO发射特性2,SO 3和NO,并且在SO原位控制2无烟煤的共燃烧期间和NO和锯末污泥干燥

利用热重分析(TGA)和衍生热重分析(DTG)研究了无烟煤和干锯木厂污泥(DSS)的燃烧行为。发现DSS是无烟煤燃烧的促进剂,在无烟煤中添加DSS降低了燃尽温度和时间。但是DSS在燃烧初期导致了SO 2和NO的快速释放总体而言,DSS的增加显着降低了SO 2的排放因子从13.42±1.80到0.31±0.08 g / kg; 在所有情况下,NO的排放因子并没有明显变化,并且稳定在0.7-0.8 g / kg。富氧气氛有助于混合物快速充分地燃烧。贫氧气氛延迟了燃烧过程并减慢了SO 2和NO的释放燃烧温度的升高改善了无烟煤的燃烧,SO 2和NO的排放因子均随温度的升高而增加。发现900°C是产生NO的最佳燃烧温度。在无烟煤燃烧过程中,在21%和30%的O 2下检测到SO 3。控制SO 2的两种有前途的方法并提供NO:1)尿素燃料混合物燃烧与Na 2 CO 3燃烧后湿吸收相结合;2)燃烧后通过NaClO / Na 2 CO 3的湿吸收。SO 2和NO的去除率分别达到100%和95%以上。通过离子色谱法将去除的产物确定为硫酸盐,亚硫酸盐和硝酸盐,没有产生有毒的副产物。

更新日期:2018-07-30
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