煤直接液化残渣掺烧的燃烧特性及其苯系物的排放特征  

Combustion Properties and Benzene Compound Emission Characteristics of Coal Liquefaction Residual Co-Combustion

作　　者：董子平 闫大海[2] 何洁[2] 罗琳[1] 黄泽春[2] 

机构地区：[1]湖南农业大学资源环境学院,湖南长沙410128 [2]中国环境科学研究院固体废物污染控制技术研究所,北京100012

出　　处：《环境科学研究》2015年第8期1253-1259,共7页Research of Environmental Sciences

基　　金：国家环境保护公益性行业科研专项(201209023)

摘　　要：为分析煤直接液化残渣（液化渣）燃烧处置技术的可行性和环境安全性,采用热重分析仪分析了液化渣、煤和掺烧物料的燃烧特性,并且通过管式炉模拟燃烧试验,研究了不同温度下掺烧过程中苯系物的排放特征.结果表明：煤和液化渣的燃烧特性及二者在燃烧过程中苯系物的排放特征存在较大差异,液化渣主要失重过程的温度区间为560-820℃,明显高于煤的主要失重过程温度区间（230-625℃）.从燃烧过程苯系物的排放规律上看,液化渣在700℃燃烧时苯系物排放量达到最大值,明显高于煤的燃烧温度（500℃）.2种物料由于燃烧特性的差异,在掺烧过程中相互影响,使得掺烧过程苯系物的排放规律发生变化.掺烧物料在500℃下燃烧的苯系物排放量为23.5 mg/kg,远小于燃烧理论值;而当温度高于700℃,苯系物排放量为172.6 mg/kg,远大于燃烧理论值.总体上看,液化渣无论是单独燃烧还是掺烧,低温条件下其燃烧过程中苯系物排放量远大于高温（≥850℃）条件下,因此液化渣的燃烧处置或燃料化利用应选择高温炉型.In order to assess the feasibility and environmental risks of coal liquefaction residual（ CLR） incineration,thermogravimetric analysis（ TG） was performed to study the combustion properties of CLR,coal and their mixture. Co-combustion of CLR and coal was simulated in a high-temperature tubular furnace to study the effect of temperature on benzene compound emissions. The results revealed distinct combustion characteristics and the emission characteristics of benzene compounds of coal and CLR. The maximum weight loss temperature of CLR was 560-820 ℃,which was significantly higher than that of coal（ 230-625 ℃）. The benzene compound emissions of CLR reached the highest at 700 ℃,which is obviously much higher than that of coal（ 500 ℃）. Due to the distinct combustion characteristics,the interactions among coal and CLR co-combustion resulted in special dynamics of benzene compound emissions,i. e.,the benzene compound emissions of co-combustion were 23. 5 mg/kg at 500 ℃,which was less than that of the theoretical value,while at 〉700 ℃ the benzene 〉compound emissions of co-combustion were 172. 6 mg/kg,which was more than that of the theoretical value. On the whole,the benzene compound emissions at low temperature were much more than that at high temperature（ ≥850 ℃）,no matter in co-combustion or single combustion condition. Thus,high temperature furnace in CLR incineration disposal or fuel utilization would be better used in practice.

关 键 词：液化渣 掺烧 热重分析 烟气 苯系物 

分 类 号：X789[环境科学与工程—环境工程]