subject: The Working Process Of Coal Mill [print this page] The working process of coal mill The working process of coal mill
Coal mill is used to efficiently blend varieties of coal with fuel oil to increase bulk density. SBM has been concerned with coal pulverized fuel for kiln and boiler firing for many years. Our coal mill pulverizer can handle all kind coal of different grades from hard coal, woody lignite and lignite to anthracite coal and petroleum coke, we can design and complete set of coal grinding plant from dry to grinding.
One of the major usages of the coal mill or coal pulverizer is to grind coal to micro powders in order to meet the demands of the fire power plant.
Raw coal ( Crushed ) is fed through coal hopper at the top of the coal mill, and then falls down by gravity to the grinder ring to be pressed, crushed and milled into pieces by rollers. Centrifugal action forces the coal outward to the grinding ring where it is pulverized between the ring and three grinding rollers. After the first crush, coal powder fall into the second and third layer. The coarse coal powder will be brought into the classifier.
Big block materials are broken to the desired size, by the elevator the material sent to storage hopper, and then the vibrating feeder evenly and continuously into the host of quantitative indoor grinding mill, grinding the powder after child was taken away fan airflow. The analysis of the grading machine, consistent with the fineness of the powder will flow through pipes into a large cyclone collector, were isolated and collected and then discharged shall be finished by powder pipe powder child. Flow cyclone collector by the large top of the return air tube blower inhalation. The machine is a closed loop system, the airflow, and is under negative pressure in the positive cycle of flow.To Mill indoors due to ground moisture content of materials which Yi Ding, grinding heat generated when grinding room leading to gas evaporation adjusting the balance between fan and duct host to achieve the balance of air, and the excess gas into small cyclone collector, the remaining sub-collection of gas into the powder down, and finally by a small cyclone collector into the upper section of the exhaust pipe the atmosphere, or into dust collector to empty gas purification within.
Coal mill plays an important role in the coal-fired power plant. In coal-fired power plants coal mill is used to pulverize and dry to coal before it is blown into the power plant furnace. Usually, the coal-fired power plant has two kinds coal mill, one is ball mill, the other is vertical mill. Ball mill is to grind the coal into coarse powder and micro powder with steel balls, and the vertical mill will dry and grind the powder again.
The air flow is fed through the mill, with the purpose of heating and lift the coal particles out of the coal mill and into the boiler furnace. The coal particles are heated to 100 degrees Celsius. The temperature of the primary air flow is manipulated for controlling this temperature measured as a temperature in the mill at the exit. The primary air temperature is controlled by controlling the position of an air mixer, which mixes heated outside air and cold outside air.
