Designed and Built for Flexibility The Raymond® Bowl Mill is considered the finest vertical roller mill available for pulverizing coal. With the high cost of fuel, many companies are discovering that it is increasingly cost effective to utilize coal or petroleum coke as primary or alternative fuel for firing kilns, air heaters and other process equipment. Raymond’s many years of experience in the design and construction of coal pulverizing equipment and systems provides a system that is built to provide the flexibility necessary for today’s sophisticated process systems. Raymond® Bowl Mills provide the following performance features: Wide range of capacities – Thirteen sizes of Bowl Mills provide base capacities from 8 to 150 tph. Easily adjustable fineness – externally adjustable classifier permits selection of fineness from 70% to 95% through 200 mesh without stopping the system. High turndown ratio – system allows safe, easy, instantaneous adjustment of capacity without affecting fineness, with a turndown ratio up to 5 to 1. Quiet, smooth operation – design insures no metal-to-metal contact between grinding rolls and ring, fuel grinds on fuel…This results in smooth, vibration-free operation with low noise levels. Handles variety of fuels – accepts bituminous, sub-bituminous and lignite coals and petroleum coke with initial moisture content as high as 40% for lignites. Flexibility – available with both dynamic and static classifiers, spring or hydraulic journal loading, the Raymond Bowl Mill is designed to operate efficiently in direct and indirect solid fuel firing systems. Bowl Mill Performance Performance is for turbine equipped mills at 70%-200 mesh (75m) and 55 Hardgrove. Power input is for mill only. Three major factors affect the capacity of any given bowl mill: desired fineness, grindability of the fuel and initial moisture. As grindability (commonly measured on the Hardgrove index) increases or decreases, so does the capacity of the mill. Typical System Arrangements Illustrated below are two typical solids fuel arrangements in which the Raymond Bowl Mill has excelled. Many variations are available. Consult Alstom Power, Raymond Operations office for additional information and assistance in a design appropriate for your application. Direct fired system - simplest and safest system for firing with pulverized coal. Bin storage system - this indirect system uses one or more bins to store fuel prior to firing. Typical Applications The Raymond® Bowl Mill, with its great degree of flexibility and dependability, has played an important part in the conversion to solid fuel by a number of industries. Raymond® Bowl Mills are now operating successfully in such widely diverse applications as cement kilns, lime kilns, coal gasification and liquification plants, taconite kilns, rotary dryers, brick kilns, industrial air heaters and furnaces, and coal/oil mixture-fired boilers. › Locate a Salesperson