以热解为首要步骤的煤炭分质转化技术可在较温和的条件下实现煤炭高效利用，其中含尘热解气净化是该技术规模化应用需要解决的关键问题之一。颗粒床过滤技术具有过滤效率高、滤料成本低等优势。为考察移动式颗粒床对粉煤热解气除尘过滤的有效性，选用小麦为颗粒床冷态试验的滤料介质，硅胶粉为试验粉尘，在自行设计的冷态试验平台上考察各操作条件对颗粒层过滤除尘效率的影响规律。结果表明：过滤效率的影响因素顺序为：表观风速＞过滤层厚度＞滤料下料速度；过滤效率随表观风速的增大而减小，随过滤层厚度的增加而增大。过滤层厚度增至200 mm以上时，过滤效率变化较小；而滤料下料速度增大，过滤效率减小。粉尘粒径达10 μm后，过滤效率基本可维持在98%。在优化的过滤条件下（过滤层厚度为300 mm，滤料下料速度为0.002 m/s，过滤时间为10 min），最佳过滤效率可达98.1%。试验结果不仅实现了对常温下移动颗粒层过滤性能的预测，也为粉煤热解含尘煤气颗粒床热态除尘装置的设计提供了依据。

Pyrolysis as the first step of coal quality conversion technology can achieve efficient utilization of coal under mild conditions，in which the purification of dust-containing pyrolysis gas is one of the key problems to be solved in the large-scale application of this technology. The granular bed filtration technology has the advantages of high filtration efficiency and low filter material cost. In order to investigate the filtration effectiveness of the granules moving bed for dust removal from pulverized coal pyrolysis gas，wheat was selected as the filter medium for the cold test，and silica gel powder was used as the experimental dust. The influence of various operating conditions on the filtration efficiency and dust removal efficiency were investigated on a self-designed cold test platform. The results show that the order of influencing factors of filtration efficiency following:apparent speed of wind > thickness of filtration layer >blanking speed of filter material;the filtration efficiency decreases with the increase of apparent wind speed and increases with the rise in filter layer thickness. When the thickness of the filter layer increases to more than 200 mm，the filter efficiency changes is small;while，the blanking speed of the filter material increases，the filter efficiency decreases. After the dust particle size reaches to 10 μm，the filtration efficiency can basically be maintained at 98%. Under optimized filtration conditions:the thickness of the filter layer is 300 mm，the feeding speed of the filter material is 0.002 m/s，the filtration time is 10 min，the best filtration efficiency can reach to 98.1%. The experimental results not only realize the prediction of the filtration performance of the granules moving bed at room temperature，but also provide a reference basis for designing the hot state dust removal device for pulverized coal pyrolysis.

0 引言

1 试验

   1.1 工艺流程

   1.2 滤料与尘样

   1.3 关键参数计算

   1.4 试验工况设计

2 试验结果与分析

   2.1 过滤效率

   2.2 最优条件下的过滤效率

   2.3 粉尘浓度对过滤效率的影响

   2.4 过滤效率表达式回归分析

3 结论