摘要
对垃圾焚烧常用的选择性非催化还原(SNCR)以及选择性催化还原(SCR)脱硝过程进行综合工艺技术分析,建立与之匹配的技术经济模型,并以500 t/d焚烧线为例,研究不同脱硝工艺的运行费用特性。研究表明,SNCR相比SCR更具经济性。SNCR运行费用中还原剂占比近70%,还原剂溶液炉内蒸发热损失不可忽略;SNCR不同还原剂的经济优劣可通过等费用线直观分析。SCR运行费用是SNCR的4~5倍,烟气加热费用占50%以上,还原剂直接费用仅6%;尿素工艺费用高于氨水工艺,其耗电量是氨水工艺的2倍以上。
A comprehensive technical analysis of SNCR and SCR process was carried out and corresponding economic model was set to analyze operation cost of different DeNOxprocesses for a 500 t/d plant.The results showed that SNCR was much more cost effective than SCR.The cost of reductant generally accounted for about 70%of the total cost of SNCR,and the cost of heat loss caused by reductant solution evaporation in the furnace could not be ignored.The economic difference of reductants should be reasonably analyzed with help of the isocost line.The operation cost of SCR was four to five times that of SNCR,the flue gas heating cost counted over half of the total cost while the direct cost of reducing agent was only 6%.The electrical consumption of urea pyrolysis process was over twice than that of ammonia process,thus ammonia solution was more cost effective than urea.
作者
沈宏伟
胡利华
郭无双
钱琨
SHEN Hongwei;HU Lihua;GUO Wushuang;QIAN Kun(Everbright Envirotech(China)Co.Ltd.,Nanjing Jiangsu 210000)
出处
《环境卫生工程》
2022年第6期34-39,共6页
Environmental Sanitation Engineering
关键词
垃圾焚烧
脱硝
氨水
尿素
waste incineration
DeNOx
ammonia solution
urea