垃圾焚烧飞灰烧结处理新工艺及炉内气流特性研究

提出了一种处理垃圾焚烧飞灰的新工艺——低温固定床烧结处理工艺。相对于其他垃圾焚烧飞灰处理工艺而言,此工艺仅以煤为燃料,不需要消耗燃油、天然气等优质能源。配合处理能力为1 000 t/d的垃圾焚烧电厂,确定了一座飞灰烧结炉的主要参数,并对此烧结炉在不同风口数量、风口直径、鼓风速度、炉料粒径条件下炉内冷态的气流特性进行了数值模拟。结果表明:6个风口时,炉内的气流分布已经比较均匀;炉内竖直方向上的压降,受炉料粒径大小的影响较大。为了使炉料具有良好的透气性,炉料粒径以10～20 mm为宜。

New Process of MSWI Sintering Furnace and Research of Its Flow Characteristic

A new MSWI fly ash harmless treatment process—low temperature fixed bed sintering is presented.Compared with other methods,this process just uses crushed coal as fuel,without consumption of fuel oil,natural gas or other high quality energy.Matching up to a MSW power plant with a capacity of 1 000 t/d,a sintering furnace configuration and main operation parameters are determined.The cold state flow characteristic of this furnace is simulated under different conditions,such as twere number,twere diameter,blast velocity and pellet size.The results show that the flow speed distribution in the furnace becomes quite uniform in the condition of 6 tweres;and pellet size has a big influence on the pressure drop in the vertical direction.In order to get a good permeability,the pellet size of 10-20 mm is desirable.