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Industry Leading Roller Mill Designs by Williams Crusher
Features That Make Williams the Acknowledged Leader in Fluid Bed Roller Mill Design
1. Product Control: Micrometer control of finished product. Product size (regardless of turn down or grinding element wear) is controlled by utilizing the Williams High Efficiency Turbine Separator equipped with a variable speed drive. Drive adjustment is controlled automatically from centralized control panel.
2. Fluidized Bed Drying: Hot gas entering the grinding chamber below the grinding rolls fluidizes the entire grinding chamber. This promotes rapid efficient drying of all material types, including lignite and sorbent. Large open area through grinding chamber allows particle terminal velocities to be maintained while fluidized by heated gasses.
3. External Gear Box: External right angle gear box eliminates damage from heat and contamination of product into gear box. Removal of gear box from skid allows change out of main vertical shaft.
4. Turn Down Ratio: Infinite turn down while maintaining product size. Williams adjusts the mill grinding rate as a direct function of control system demand. The mill capacity is modulated by varying mill speed.
5. Mill Speed: Mill speed modulation varies the centrifugal force of the grinding rolls. Product capacity ranges from 100% to 0% utilizing an optional variable frequency A.C. drive.
6. Bottom Discharge: Auxiliary Mill Bottom Discharge permits production of a second granular product or beneficiation of the principal product by the removal of pyrites and tramp material, either can be done simultaneously with fine grinding and drying.
Williams Roller Mill Operation and System Features
B. Base of the Roller Mill
C. Centrifugal Main Mill Fan
D. High Efficiency Turbine Separator
E. Cyclone Collector
F. Fabric Collector
H. Recycle Line
K. Discharge Spout
Operation of the Williams Roller Mill System is completely automatic.
The feeder (A) introduces raw material into the grinding chamber in the base of the Roller Mill (B) at a rate determined by pressure variations with the grinding mill. Plows located ahead of each roller direct the material upward and between the grinding rolls and the heavy alloy steel bull ring where it is ground to size. The grinding rolls are free to swing out centrifugally which forces them to bear upon and grind the raw material. Being free to pivot, the rolls automatically assume the proper position for grinding and need no adjustment to compensate for wear.
Once ground to size, material is swept out of the mill by the controlled air flow from the centrifugal main mill fan (C). Air suspended, the ground material passes through the adjustable Williams High Efficiency Turbine Separator (D). In the separator, an accurate size classification is made which allows product size material to be conveyed away from the grinding mill while oversize material is returned for additional grinding. Product sized material is removed from the airstream by the Cyclone Collector (E). Typically, a conveyor or product storage bin will be located to accept the product as it exits from the bottom of the Cyclone Collector.
Fabric Collector (F): Airborne fines which remain entrained in the exhaust gas from the Cyclone Collector are removed by a high efficiency fabric dust collector located downstream from the cyclone. The efficiency of the basic Roller Mill System becomes a highly efficient means of removing moisture from the raw material by the simple addition of an air heater (G) as shown in color.
Further refinements to the heater system allow the Williams Roller Mill to process hazardous dusts in a controlled low oxygen atmosphere. A recycle line (H) from the dust collector to the heater enables a further reduction in oxygen level. This is Williams' patented Inert Gas System.
Product beneficiation is possible in the Williams Roller Mill System by continuous removal of impurities through a discharge spout (K) located beneath the grinding mill.
Key Components for Complete Engineered Roller Mill Systems
A. Primary and Secondary Fans provide the fluidizing and conveying of the product and removal of moisture from the system.
B. The product from the grinding mill is separated from the air stream by the Cyclone Collectors.
C. Williams' exclusive independent, External Gear Box arrangement provides trouble free operation.
D. Hot gas for drying can be provided by a dedicated Air Heater or from an auxiliary source. Hot and cold tempering dampers provide accurate mill temperature and product consistency.
E. Optional Automatic Journal Lubrication System and air seal can be supplied for 24-hour operation.
Feeders for Williams Roller Mills
Since Williams Roller Mills are used on a wide range of materials, the proper feeder selection is essential for high-capacity, trouble-free operation. Shown here are a few of the different types of feeders that can be furnished to fit the needs of these grinding mills:
A. Vibratory feeder for high capacity and abrasive materials.
B. Volumetric or gravimetric weigh belt feeder for accurate material
C. Live bottom screw feeders for wet, sticky materials such as clay or filter cake.
Contact us today to discuss your application in detail with one of our experienced sales engineers. Call (314) 621-3348, email us at firstname.lastname@example.org or locate an agent near you.