摘要
基于燃料的完全燃烧模型,对市政垃圾衍生燃料(RDF)的燃烧特性进行了分析,并对其在分解炉内的热贡献进行了模拟计算.结果表明:入窑基RDF完全燃烧时最小燃烧空气量Amin为0.335Nm3/MJ,最小燃烧废气量Vmin为0.463Nm3/MJ,均大于煤粉;对于入炉温度为20℃的入窑基RDF,当助燃空气温度为850℃时,其绝热燃烧火焰温度可达1595.9℃,对分解炉的热贡献为4.57MJ/kg,热量利用率为72.2%,即分解炉内喂入4.95t(低位热值为6.30MJ/kg)入窑基RDF与1t(低位热值为24.49MJ/kg)煤粉产生的发热量相当,该理论计算替代量与实际生产数据的偏差率仅为3.2%;最后计算了不同水分下的临界灰分以及对应的RDF临界热值,并给出了RDF的热贡献分区用于指导水泥窑协同处置生产实践.
Based on the complete combustion model, the combustion characteristics of municipal refuse derived fuel (RDF) were analyzed and its heat contribution in the precalciner was calculated in this paper. The results showed that Amin was 0.335 Nm3/MJ and Vmin was 0.463 Nm3/MJ when the kiln-basis RDF was completely burned and both of which were larger than pulverized coal. For the temperature of RDF fed into the precalciner was 20 °C, when the combustion air was 850 °C, the adiabatic combustion flame temperature was up to 1 595.9 V. and the heat contribution to precalciner was up to 4.57 MJ/kg, as well as the heat-utilization was 72.2%. It means that the calorific value generated by 4.95 tons of RDF (2 net=6.30 MJ/kg)in the precalciner was equivalent to 1 ton of coal powder(0net=24.49 MJ/kg). The deviation rate between the theoretical and actual substituted ratio was only 3.2%. At last, the ash and the critical calorific value of RDF under different moisture content have been calculated, meanwhile the heat contribution zone of RDF was given to guide the production practice of cement kiln co-processing.
出处
《水泥》
CAS
2019年第9期14-18,共5页
Cement
关键词
垃圾衍生燃料
完全燃烧
绝热火焰温度
热贡献
临界热值
协同处置
refuse derived fuel
complete combustion
adiabatic flame temperature
heat contribution
critical calorific value
co-processing
