At first, the research achievements of pressure drop characteristics due to pipe bends in air-solids two phase flows are summarized. Then, the experimental study on pressure drops in accordance with dilute phase pneumatic conveying in 45° and 110° circular bends of coal pulverization system of boiler are made. Through analyzing the experimental results obtained by experiments, the formulas for calculating the pressure drops of air-solids two phase flows in 45° and 110° circular bends are obtained.
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