制焦条件和催化剂对大颗粒煤焦还原NO影响

发布时间：2018-01-13 00:17

本文关键词：制焦条件和催化剂对大颗粒煤焦还原NO影响　出处：《哈尔滨工业大学学报》2016年07期 　论文类型：期刊论文

更多相关文章：煤焦 NOx 停留时间 制焦温度 催化剂

【摘要】：为探索一种有效的工业锅炉脱硝技术,针对管式炉,研究制焦停留时间、制焦温度和担载不同催化剂对粒径1.7~2.8 mm煤焦还原NO的影响.结果表明:900℃以下时,制焦停留时间越长,大颗粒煤焦对NO的还原性越差,在900℃时,停留时间对反应的影响则不大.随着制焦温度的升高,大颗粒煤焦-NO的反应性大体呈降低趋势,但在低温段(500~600℃左右)则规律相反,呈上升趋势.添加不同种类的金属催化剂对煤焦还原NO能力有不同程度的提高,平均催化活性排序为FeCuKNaCaMg.金属元素对煤焦异相还原NO的催化效果受温度影响较大,不同实验条件下金属的催化能力不同.此外,煤焦本身的性质(包括挥发分含量、孔隙结构和微晶结构)对还原NO反应也有较大影响.煤焦的挥发分含量越高,孔隙越发达,石墨化程度越低,对NO的还原效果就越好.
[Abstract]:To explore an effective industrial boiler denitration technology for tube furnace on coke coke temperature and residence time, supported catalysts NO reduction effect on the particle size of 1.7~2.8 mm coal. The results showed that: 900 DEG C, coke longer residence time of large particles of NO char worse, at 900 DEG C, effect of residence time on the reaction is little. With the increase of charmaking temperature, reaction of coal char particle -NO generally decreased, but at low temperature (500~600 degrees Celsius) is the law is on the rise. Instead, the addition of different metal catalysts with different degree the increase of char NO capacity, the average ranking for the FeCuKNaCaMg. catalytic activity of metal elements on the char heterogeneous catalytic reduction effect of NO is affected by temperature, the catalytic ability of metals under different experimental conditions. In addition, the nature of coal itself (including volatile The content, pore structure and microcrystalline structure also have a great effect on the reduction of NO. The higher the volatile content of coal char, the more developed the pore. The lower the graphitization degree, the better the effect of NO reduction.

【作者单位】：燃煤污染物减排国家工程实验室(哈尔滨工业大学);
【基金】：国家科技支撑计划项目(2014BAA02B03) 黑龙江省自然科学基金(E201429) 国家自然科学基金(51576056;51506035)
【分类号】：X701
【正文快照】： 在工业锅炉[1-2]实际运行中发现,炉排上部分颗粒直径3 mm的煤(焦)会被助燃空气吹起并携带,在炉膛内短暂停留后随着尾部烟气排出,造成不完全燃烧损失.这部分未完全燃烧的煤焦含有少量挥发分,且孔隙结构发达,有助于NOx还原.因此,本课题组拟采用收集尾部烟气携带半焦(粒径3 mm)

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