富氧燃烧烟气中褐煤飞灰的固硫与固碳反应特性实验研究  

Experimental Studies on Lignite Fly-Ash Characteristics of Sulfuration Retention and Carbonation Retention Reaction in Flue Gas of Oxy-Fuel Firing

作　　者：乐俊超 张健[2] 曹瑞杰 LE JunChao;ZHANG Jian;CAO RuiJie(Renewable Energy Operation Management Co.Ltd.,Shanghai Environment Group;School of Environment and Architecture Engineering,University of Shanghai for Sci-ence and Technology;Shanghai Institute for Design and Research on Environmental Engineering)

机构地区：[1]上海环境集团再生能源运营管理有限公司 [2]上海理工大学环境与建筑学院 [3]上海环境卫生工程设计院有限公司

出　　处：《上海节能》2022年第7期879-884,共6页Shanghai Energy Saving

基　　金：上海市科委项目(16PJ1407800)。

摘　　要：与传统空气燃烧烟气相比,富氧燃烧烟气中SO_(2)浓度有3~4倍的提高。烟道中飞灰碱土金属更多地发生固硫与固碳反应。通过高温沉降炉实验,分析了600℃、800℃、1000℃高温下碱土金属捕捉SO_(2)与CO_(2)的规律。600~1000℃下飞灰发生固硫反应的组成主要是CaO,且温度越高固硫反应的速率越快。800~900℃下富氧烟气中会同时发生灰的固硫与固碳反应。800℃时,1000 ppm SO_(2)下,飞灰固硫与固碳反应同时发生。在1500 ppm SO_(2)浓度下,固硫反应会抑制固碳反应。研究对富含CaO的飞灰再利用、炉内高温干法脱硫等有一定的理论指导意义。Compared with traditional air firing of pulverized coal,SO_(2) concentration is generally enhanced by around 3-4 times in the flue gas of oxy-fuel firing,as thereby promotes more sulfur retention of alkaline earth metal in fly-ash of lignite.A series of experiments were conducted on the bench of drop-tube furnace to analyze the mechanism under 600,800 and 1000℃.The main conclusion includes:Active CaO in ash is key to capture SO_(2) under higher temperature.At 800-900℃,the ash-sulfur and carbon-fixing reactions will occur simultaneously in the oxygen-enriched flue gas.With higher concentration of SO_(2),,like 1500 ppm,carbonation process of ash is inhibited by the sulfuration reaction under 800℃.The research has certain theoretical guiding significance for the reuse of CaO-rich fly-ash and the high temperature dry desulfurization in the furnace.

关 键 词：富氧燃烧 褐煤 飞灰 固硫反应 固碳反应 

分 类 号：X701[环境科学与工程—环境工程]