气化原料中粉末过多，料层阻力增大，透气性变坏。
Gasification materials of powder is overmuch, material layer resistance increases, permeability worse.
在锅炉冷态试验中，进行了锅炉空床和不同料层厚度下的床层阻力特性试验，确定了锅炉的临界流化风量。
In cold test of boiler, resistance performance experiments of empty bed and different thickness were conducted, and the boiler's critical fluidized flow was determined.
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