论文部分内容阅读
一、细灰燃烬是提高沸腾炉燃烧效率的关键我国沸腾锅炉的燃煤,大多数制成0～8mm宽筛分,小于0.5mm的煤粒占20～30％,而煤在沸腾燃烧过程中,由于受热爆裂及相互摩擦作用,会产生更多的细小颗粒。当沸腾床在900～950℃温度下运行时,一般热态截面上升速度为3.5～4.5m/s,这一速度超过了8mm以下各种颗粒的临界沸腾速度,可保证沸腾床料的良好沸腾状态。但是这一速度超过了0.5mm以下颗粒的临界飞出速度,使得这部分细粒被带出沸腾床。
First, the fine ash burning embers is to improve the efficiency of the key to the boiling furnace boiling coal-fired boilers in China, most made of 0 ~ 8mm wide screen, less than 0.5mm coal accounted for 20 to 30%, and coal in the boiling combustion process , Due to thermal burst and mutual friction, will produce more small particles. When the ebullated bed is operated at a temperature of 900-950 ° C, the general thermal state section rise rate is 3.5-4.5 m / s, which exceeds the critical boiling speed of various particles under 8 mm, thus ensuring good boiling of the ebullated bed material status. However, this speed exceeded the critical flying speed of particles below 0.5 mm, causing the part of the particles to be carried out of the ebullated bed.