废线路板等温热解能耗试验研究

Test on isothermal pyrolysis of waste printed circuit board

本文利用自行设计的管式热解炉进行废线路板等温热解实验,选择高精度电表及特殊的时间统计方法来提高测量精度,以精准获得废线路板热解能耗,试验结果表明:采用秒表记录热解过程中高精度电表每跳动0.01 kW·h所需时间,可以进一步提高测量精度,使其与废线路板热解能耗在同一数量级,减小误差至3%以内;废线路板单位热解反应热随温度升高而增大,最佳热解温度700℃时单位热解反应热为854.34 kJ/kg,随温度升高,热解反应耗时逐渐减少;热解所得热解气热值完全可满足线路板热解反应所需热量,若提高热解炉床能力,可实现废线路板热解完全自热。

The isothermal pyrolysis test of waste PCB was carried out by using a self-designed tubular pyrolysis furnace. High-precision electric meter and a special time statistical method were used to improve measurement accuracy and accurately obtain the pyrolysis energy consumption of waste PCB. The test results showed that the measurement accuracy can be further improved by using stopwatch to record the time required for high-precision ammeter to beat 0.01 kW·h in pyrolysis process, and make it in the same order of magnitude as the pyrolysis energy consumption of waste PCB so that the error can be reduced to within 3%. The unit pyrolysis heat of waste PCB increased as temperature rose. The unit pyrolysis reaction heat under the optimum pyrolysis temperature of 700 ℃ was 854.34 kJ/kg. And the pyrolysis time gradually decreased with the increase of temperature. The heat value of pyrolysis gas from pyrolysis can fully meet the heat required by PCB pyrolysis reaction. If the capacity of pyrolysis hearth is increased, the waste PCB can be completely self-heated by pyrolysis.