摘要
介绍了水泥窑协同处置危固废(危险固体废弃物)的预处理固态系统工艺流程,分析了危固废的水分、热值及处置量与水泥窑风、煤、一氧化碳及氮氧化物排放的相关关系,以实际工业试验验证了危固废入窑对水泥窑能耗及氮氧化物排放的影响。结果表明,窑喂煤量是影响氮氧化物排放的主要原因,窑喂煤量随着危固废热值的增加而逐渐降低,除尘灰和大修渣入窑处置,有助于降低氮氧化物的排放量。危固废月处置量为1000t时,实际减煤量达3.21kg/t.cl。在实际运行过程中,危固废处置量>4t/h时,为避免窑内产生还原气氛,入窑危固废氯离子含量应<1%,碱含量<4%,此控制指标下窑系统氯离子循环富集率平均为51%。
In this study,it introduced the process flow of solid state system for the pretreatment of hazardous solid waste in cement kiln.Meanwhile,it analyzed the relationship between the moisture,calorific value and disposal amount of hazardous solid waste and the cement kiln gas,coal,carbon monoxide and nitrogen oxide,to reveal the effect of hazardous solid waste in kiln on energy consumption and nitrogen oxide emissions in cement kiln by practical industrial test.Results showed that the kiln coal feeding is the main reason for the impact of nitrogen oxide emissions,and the kiln coal feeding amount gradually decreased with the increased of hazardous solid waste calorific value.The emission of nitrogen oxide can be effectively decreased by the disposal of overhaul slag and precipitator dust in cement kiln.When the monthly disposal amount of hazardous solid waste is 1000t,the standard coal consumption of clinker was reduced by 3.21kg/t.In the actual operation process,in order to achieve a disposal capacity of 4t/h without creating a reducing atmosphere,the content of hazardous solid waste chloride ion in the kiln should be controlled below 1% and the alkali content should be controlled below 4%.Under this control index,the average enrichment rate of chloride cycle in kiln system is 51%.
作者
王玉楷
朱志领
WANG Yukai;ZHU Zhiling(Jiyuan Haizhong Environmental Protection Technology Co.,Ltd.,Jiyuan Henan 454650,China)
出处
《水泥技术》
2022年第6期77-82,共6页
Cement Technology
关键词
水泥窑协同处置
危固废
氮氧化物
氯离子
循环富集率
cement kiln coordinated disposal
hazardous solid waste
nitrogen oxides
chloride ion
cyclic enrichment rate
