Distribution of pulverized coal flow in a power-station pipe-network

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Conference Proceeding
Proceedings of the 18th Australasian Fluid Mechanics Conference, AFMC 2012, 2012
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This work aims to identify the factors affecting the flow of pulverized coal (fuel) carried by air in pipe-networks to feed the boiler furnaces of a power-station. The pipe-network considered consists of four 457mm-diameter mill pipes which take the pulverised coal of nominal size 75micron from a coal-pulverising mill, to a boiler furnace, with 2 pipes going to its front, and 2 to its back side. Each of these four pipes is in turn divided into two 305mm-diameter burner pipes (totalling 8) which feed the fuel to the furnace. At full load (100%), a total of 45 tonnes/hr of coal would be used. In this work, measurements were carried out at 5 reduced loads ranging from 35.5% to 60.1%. The coal is carried in each fuel pipe by 11.5 to 17 kg/s of air flow. The desired distribution is that fuel is evenly split among all the pipes, namely 25% of the total coal in each mill pipe, and half of that amount in each of the 8 burner pipes. It is found that at low fuel loads, the distribution deviates significantly from the desired one. Distribution, however, improves with increasing load. Geometric layout of the pipes is identified as an important factor, with less fuel flowing in pipes having more bends. On the other hand, the improvement of distribution with higher load (more fuel) is rather unexpected. Results from this work are being used to validate a CFD model which in turn helps with the design of better networks.
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