针对一实际尺寸的带下置涡流室的分解炉进行了数值模拟,探讨了煤、RDF两种燃料共燃与碳酸钙分解相耦合的化学反应过程。计算所得煤粉及RDF燃烬率分别为99%和100%,碳酸钙分解率为95%,与工程实际数据吻合较好。结果表明:煤粉自涡流室顶部入炉后,先向下俯冲,再在气流的携带下转而向上运动,在分解炉柱体部分螺旋上升,其燃烧时以焦炭燃烧占主导,在涡流室上方的锥体部分及锥体部分上方的下半柱体部分形成主燃区;RDF自分解炉柱体部分下部水平入炉后,先运动至中部,旋即与煤粉流交织在一起螺旋上升,其燃烧时以挥发分燃烧占主导,在分解炉下半柱体部分形成主燃区;CaCO3自涡流室顶部入炉后,首先在涡流室及其下方的锥体部分做涡旋运动,一部分因吸收高温气流的热量而分解,剩余大部分上旋至燃料主燃烧区,因吸收燃烧所释放的热量而分解;燃料燃烧放热与CaCO3吸热分解相耦合后,最终在分解炉柱体部分形成了均匀、稳定的温度场。 A real-scale calciner with a vortex chamber underneath was simulated and the chemical reaction process of co-combustion of coal and RDF with calcium carbonate decomposition was discussed. Calculated pulverized coal and RDF burning ember rate were 99% and 100%, calcium carbonate decomposition rate of 95%, and the actual project data is in good agreement. The results show that pulverized coal is diverted downward from the top of the vortex chamber and then diverted upward when it is carried by the airflow. The pulverized coal rises spirally in the part of the decomposing furnace. When the pulverized coal burns, coke combustion prevails. The upper cone part and the lower half part of the cone above form the main combustion zone. After the RDF enters the furnace horizontally from the lower part of the furnace part of the furnace, it moves to the middle firstly and spirally interweaves with the pulverized coal flow, The combustion is dominated by volatile combustion, forming the main combustion zone in the lower half of the decomposition furnace; CaCO3 from the top of the vortex chamber into the furnace, the vortex chamber and the cone below the first part of the vortex movement, part of the Absorbs the heat of the high-temperature gas stream to be decomposed, and most of the remaining is spun up to the main combustion zone of the fuel and is decomposed by absorbing the heat released by the combustion; after being coupled with the endothermic decomposition of CaCO3, the combustion heat of the fuel is finally formed in the part of the decomposition furnace column A uniform and stable temperature field.