Coal Feeder – Volumetric To Gravimetric Conversion

Gravimetric Conversion

For all Makes & Models of Coal Feeders
Improve plant heat rate
* Account for fuel use

Volumetric operation of a coal feeder has served the industry for many years. In a volumetric system the flow of material is controlled by the boiler demand system, but the actual amount fed is estimated and the accuracy can vary greatly. In today’s competitive environment, it is essential for efficient operation of the plant to know the accurate amount of fuel that is being used. The gravimetric feeder does this by determining the product of the fuel belt load multiplied by the speed to give the actual flow rate (e.g. tons/hr). This flow rate is compared to the boiler set point and the belt speed is varied accordingly:

Gravimetric Conversion Scope:

  • Installing a two loadcell weigh suspension with no moving parts, levers, or linkages.
  • Integrating high resolution belt speed encoder.
  • Adding a Merrick state-of-the-art MC3 controller to control the feeder, calculate the feedrate, and provide process data back to the control room.

  • Minimal (and in some cases no) cutting or welding
  • In most cases can be performed in 2 days
  • State-of-the-art Merrick MC3 controller. Benefits include its user-interface and the graphical LCD touch-screen display, making the MC3 the easiest to learn and use. Also, the MC3 has unparalleled connectivity to most any modern industrial network protocols.
  • Stainless steel load cells—mechanically protected, hermetically sealed
  • With dual load cells, the MC3 controller monitors the performance of each load cell independently and converts to volumetric automatically if ever required.
  • Ease of calibration by any of 4 methods. No probes or other special equipment required.
  • No weigh linkages, bearings, or knife-edges to wear – improving accuracy.


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