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The mill crushes the coal to a fine dust and the fines are sucked via a large mill The hot air intake can be sufficiently hot to serve as an ignition source and Typical in Thorwesten supply is the 2 bar g pressure shock resistant PF silo d Hot coal from storage areas should be discarded and not fed into the pulveriser Get Price

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The air fow to the coal mills and into the boiler is controlled by the plant s distributed control system DCS which requires accurate and responsive air fow measurement data to control the dampers and keep the primary air fow to the coal mill entrance at precise and effcient levels Figure 2 shows the primary air duct at the coal mill

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Coal is first fed from silos at the plant to coal mill pulverizers which grind the coal into a fine powder A fan blends and forces a primary flow of mixed ambient cold air and pre heated hot air into the coal mill This air is mixed with the coal powder creating a combustion air

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Effects of Mill Performance on Unburnt Carbon in Coal Effects of Mill Performance on Unburnt CarbonVelocity of air coal mixture in a millThe higher primary air

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8 6 MILL DIRTY AIR FLOW TEST 8 6 1 Intoduction The factors affecting pulveriser performance include grindability of coal moisture content of coal size of input coal wear condition of grinding elements and classifier fineness of pulverized coal primary air quantity and temperature On a day to day basis mill performance is monitored

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Designed for applications where the presence of airborne particulate might impair the measurement accuracy of Air Monitor s Combustion Air Station or VOLU probe array Pulverized Coal Flow Measurement Pf FLO Developed to determine the mass flow and distribution of pulverized fuels in the individual pipelines from the coal mill to the burner

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Inaccurate measurements that underestimate actual levels of primary air PA flow in a coal plant are particularly problematic because higher than expected PA flow levels wreak havoc on more than

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Pulverized Coal Pipe Testing and Balancing By Richard F Dick Storm PE The first step in optimizing combustion system performance is balancing the air and fuel flowing through each of the plant s coal pipes the pipes that convey the air fuel mix from the pulverizers

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A dirty air probe is required when measuring flow velocity in an operating coal pipe The dirty air velocities of each pipe should be within 5 of the mean of all the coal pipes to achieve uniform

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Warm the mill to normal operating temperature of 150F mill outlet temperature bituminous coal and airflow at minimum normal minimum primary air PA flow Conduct a PA airflow measurement

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In Boiler System for Thermal Electric Power Generation dampers and keep the primary air flow to the coal mill Mass Flow Meter Supports Feedback Control Loop
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