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Raymond bowl mills, Raymond coal mill

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Raymond bowl mills, Raymond coal mill

April 29, 2023 nflg 0 Comments

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

llustrated 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.

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.

Raymond mill : Raymond bowl mill

The machine is used to grind barite, calcite, potash feldspar, talcum, marble, limestone , ceram and slag below scale 7 of Moth’s hardness and 280-odd sorts of non-inflammable and non-explosive stuff in the traded of mining , building material, chemical engineering and metallurgy for power generation and processing. The product size is adjustable on required in the range of 100-325 meshes.

Load the stuff for grinding evenly and continuously into the grinding chamber of the main frame. Due to the centrifugal force in rotation, the roller swings outward and presses closely upon the ring. The shovel carries the stuff to the space between the roller and ring. When the roller rolls, the stuff is thus grinded.

After being grinded, the stuff is to be routed to the sorter along the wind belt of the blower and the rough powder will be put back to the grinder for regrinding. The fine powder flows into the product cyclone collector together with airflow and is expelled from the powder output pipe as product.

In the grinding chamber, since the stuff may contain moisture to some extent, the heat generated during grinding makes the moisture evaporated; Since the pipeline joints are not airtight, the external air is sucked in and the circulation air mass increases. In order to enable the grinder to work under negative pressures, the increased airflow is guided to the deduster anew sequentially to the atmosphere after purification.

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