Grinding, classifing and blending coal are major processes which need many kinds of flow meters for powder and bulk solids. The flow meters, also, are necessary to feed pulverized coal instead of heavy oil.
The report divides them into inferential and possitive types. The former's characters are smaller, lighter, cheaper and more suitable to processes and flow control. The typical one is Impactline Flow Meter. The latter is larger and more complicated, and needs larger space for installation. Belt scales, however, fit to measure flow of lump and Stopless Flow Meters are as accurate as hopper scales and smaller than them.
Impact-hi and Loss of weight system for feeding pulverized coal accurately are introduced comparing features of both. Pneumaliue Flow Meter is also explained as a flow meter for solid-gas two phase flow.
