碱土元素改性燃料对其燃烧NO_x减排研究
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摘要
烧结过程中的NO_x主要来自燃料,有限的低N燃料储量限制了源头减排技术的应用。采用含钙、镁等碱土元素物质改性燃料,降低燃料燃烧过程中N的转化率,从而实现NO_x的源头减排。研究结果表明:含钙、镁物质均能有效地降低燃料燃烧过程中N的转化率。其中,含钙物质中铁酸钙催化效果最好,含镁物质中硫酸镁催化效果最好;与基准相比:CaO·Fe_2O_3添加量为3.0%时,NO_x排放量和N转化率分别降低41.92%和42.02%;MgSO_4添加量为1.0%时,NO_x排放量和N转化率分别降低28.89%和29.01%。
The NO_x during the iron ore sintering mainly comes from the fuels,and the NO_x emission reduction from the source is restricted because of the limited low N fuels. In order to realize the NO_x emission reduction from the source,the materials containing alkaline-earth elements including Ca and Mg are employed to modify the fuels to decrease the N conversion rate. The results show that the materials containing Ca and Mg can reduce the N conversion rate effectively in the fuel burning process,and CaO·Fe_2O_3 and MgSO_4 present the superior results. Compared with the reference,the NO_x emissions and N conversion rate decrease by 41.92% and 42.02% respectively when 3.0% CaO·Fe_2O_3 is added,and the NO_x emissions and N conversion rate decrease by 28.89% and 29.01% respectively when 1.0% MgSO_4 is added.
The NO_x during the iron ore sintering mainly comes from the fuels,and the NO_x emission reduction from the source is restricted because of the limited low N fuels. In order to realize the NO_x emission reduction from the source,the materials containing alkaline-earth elements including Ca and Mg are employed to modify the fuels to decrease the N conversion rate. The results show that the materials containing Ca and Mg can reduce the N conversion rate effectively in the fuel burning process,and CaO·Fe_2O_3 and MgSO_4 present the superior results. Compared with the reference,the NO_x emissions and N conversion rate decrease by 41.92% and 42.02% respectively when 3.0% CaO·Fe_2O_3 is added,and the NO_x emissions and N conversion rate decrease by 28.89% and 29.01% respectively when 1.0% MgSO_4 is added.
引文
[1] 朱廷钰.烧结烟气净化技术[M].北京:化学工业出版社,2008.
[2] 张洪亮,施琦,龙红明,等.烧结烟气中氮氧化物脱除工艺分析[J].钢铁,2017,52(5):100-106.
[3] 生态环境部,关于征求《钢铁企业超低排放改造工作方案(征求意见稿)》意见的函[EB/OL].北极星大气网,(2018-5-15).http://huanbao.bjx.com.cn/news/20180515/897857.shtml.
[4] 郄俊懋,张春霞,王海风,等.烧结烟气典型污染物排放形势及减排技术分析[J].烧结球团,2016,41(6):59-64.
[5] 闫伯骏,邢奕,路培,等.钢铁行业烧结烟气多污染物协同净化技术研究进展[J].工程科学学报,2018,40(7):767-775.
[6] 闫武装,谢桂龙,周景伟,等.低温氧化法用于烧结烟气脱硝的可行性探析[J].中国冶金,2018,28(5):1-6.
[7] 王子宏,阮志勇,朱梦飞,等.燃料特性对其燃烧过程NO排放行为的影响[J].烧结球团,2018,43(6):19-23.
[8] 李华,林器.碱金属、碱土金属和过渡金属对煤的催化氧化作用[J].大连理工大学学报,1989,29(3):289-294.
[9] 范浩杰,曹欣玉,冯元群,等.金属化合物催化煤燃烧的规律研究[J].燃烧科学与技术,1995,1(3):212-218.
[2] 张洪亮,施琦,龙红明,等.烧结烟气中氮氧化物脱除工艺分析[J].钢铁,2017,52(5):100-106.
[3] 生态环境部,关于征求《钢铁企业超低排放改造工作方案(征求意见稿)》意见的函[EB/OL].北极星大气网,(2018-5-15).http://huanbao.bjx.com.cn/news/20180515/897857.shtml.
[4] 郄俊懋,张春霞,王海风,等.烧结烟气典型污染物排放形势及减排技术分析[J].烧结球团,2016,41(6):59-64.
[5] 闫伯骏,邢奕,路培,等.钢铁行业烧结烟气多污染物协同净化技术研究进展[J].工程科学学报,2018,40(7):767-775.
[6] 闫武装,谢桂龙,周景伟,等.低温氧化法用于烧结烟气脱硝的可行性探析[J].中国冶金,2018,28(5):1-6.
[7] 王子宏,阮志勇,朱梦飞,等.燃料特性对其燃烧过程NO排放行为的影响[J].烧结球团,2018,43(6):19-23.
[8] 李华,林器.碱金属、碱土金属和过渡金属对煤的催化氧化作用[J].大连理工大学学报,1989,29(3):289-294.
[9] 范浩杰,曹欣玉,冯元群,等.金属化合物催化煤燃烧的规律研究[J].燃烧科学与技术,1995,1(3):212-218.