In order to study the appropriate and advanced technology for recycling waste printed circuit boards (PCBs), a fixed bed pyrolysis device with stirring function has been designed and developed. The effect of rotating speed on the temperature distribution and mass change in the pyrolysis process of FR-4 PCB has been analyzed. The heat transfer and pyrolysis characteristics of different granular layers with and without stirring have been investigated. The results indicate that the stirring can change the main way of heat transfer from conduction to convection in the PCB layers. As the increase of rotating speed, the temperature rising rate of material at the bottom of the pyrolysis furnace gradually decreases, while the heating rate is increasing at the upper layer, and the temperature difference between the upper and bottom layers is gradually reduced. When the rotating speed varies from 0 r/min to 18 r/min, the weight loss of the material increases from 3.97% to 6.76%, and the overall pyrolysis degree is improved. During the pyrolysis process, the material layer can be divided into three zones along the vertical direction, namely complete pyrolysis zone, partial pyrolysis zone and non-pyrolysis zone. As the rotating speed is 0 r/min, the thickness of each zones is 6 cm, 6 cm and 3 cm, respectively. However, when the rotating speed is increased to 18 r/min, the non-pyrolysis zone disappears, and the thickness of complete pyrolysis zone and partial pyrolysis zone increase to 9 cm and 6 cm, respectively.

为了研究适当的先进技术来回收废印刷电路板（PCB），已设计并开发了具有搅拌功能的固定床热解装置。分析了FR-4 PCB热解过程中转速对温度分布和质量变化的影响。研究了不同颗粒层在搅拌和不搅拌下的传热和热解特性。结果表明，搅拌可以改变PCB层中热的主要传导方式，从传导到对流。随着转速的增加，热解炉底部物料的升温速率逐渐降低，而上层加热速率逐渐升高，上下层之间的温差逐渐减小。当转速从0 r / min更改为18 r / min时，材料的重量损失从3.97％增加到6.76％，并且总的热解度得到改善。在热解过程中，材料层可沿垂直方向分为三个区域，即完全热解区，部分热解区和非热解区。当旋转速度为0r / min时，每个区域的厚度分别为6cm，6cm和3cm。但是，当转速提高到18 r / min时，非热解区消失，完全热解区和部分热解区的厚度分别增加到9 cm和6 cm。材料的失重从3.97％增加到6.76％，整体热解度得到改善。在热解过程中，材料层可沿垂直方向分为三个区域，即完全热解区，部分热解区和非热解区。当旋转速度为0r / min时，每个区域的厚度分别为6cm，6cm和3cm。但是，当转速提高到18 r / min时，非热解区消失，完全热解区和部分热解区的厚度分别增加到9 cm和6 cm。材料的失重从3.97％增加到6.76％，整体热解度得到改善。在热解过程中，材料层可沿垂直方向分为三个区域，即完全热解区，部分热解区和非热解区。当旋转速度为0r / min时，每个区域的厚度分别为6cm，6cm和3cm。但是，当转速提高到18 r / min时，非热解区消失，完全热解区和部分热解区的厚度分别增加到9 cm和6 cm。当旋转速度为0r / min时，每个区域的厚度分别为6cm，6cm和3cm。但是，当转速提高到18 r / min时，非热解区消失，完全热解区和部分热解区的厚度分别增加到9 cm和6 cm。当旋转速度为0r / min时，每个区域的厚度分别为6cm，6cm和3cm。但是，当转速提高到18 r / min时，非热解区消失，完全热解区和部分热解区的厚度分别增加到9 cm和6 cm。