RTKM Separator

The most efficient separator for new and old coal grinding ball mills

  • Overview
  • Installation

Key features and benefits

  • The most effective choice for new coal-grinding ball mills
  • Ideal solution for replacing existing, less efficient separators
  • Improves the specific energy consumption of the mill system by up to 15 percent
  • Steeper particle size distribution curve, notably lower residue on coarse sieve
  • Between 10 and 15 percent higher throughput at the same residue on the 90 μm sieve
  • Optimal design for very fine grinding pet coke and hard fuels

Well-proven and efficient

The RTKM separator is specially designed for use with ball mills that grind coal, petcoke or charcoal. It is an energy-efficient and well-proven solution which incorporates the experience attained from over 1500 high efficiency dynamic air separators supplied by FLSmidth in grinding applications.

The RTKM separator is the obvious choice for new coal-grinding ball mills. But it is also an ideal solution for upgrading existing coal-grinding installations, which in most cases incorporate a less efficient static, or first and second generation dynamic separator.
Upgrading such plants with the high efficiency RTKM separator will reduce the overall energy consumption of the grinding process and improve the fuel quality for better burner performance.

Design features

The separator is designed to prevent coal dust from accumulating inside the casing, and it will resist an overpressure of 3.5 bar (50 psi) in the event of an explosion. Inside the separator casing is a cylindrical rotor surrounded by a ring of adjustable louvres. The louvres are lined with replaceable wear plates.

Below the louvres is the reject cone which has an air sluice fitted in the outlet. Mill discharge material is carried by air from the mill directly to the separator and passes through the louvre system before
entering the rotor.

The rotor forces the coarse particles outwards onto the louvre wear plates. They then fall down into the reject cone and return to the mill inlet for further grinding. The fines are suspended in the air and discharged via the outlet in the upper part of the separator casing. The fineness of the end product can be regulated by varying the speed of the rotor, the air flow volume, and/or by adjusting the angle of the louvres. The rotor is driven via a gear box by a variable speed AC motor fitted on top of the separator unit. Easy access to servicing of the gear box is provided.

Proven high performance

Almost two decades of operational experience have shown that the RTKM separator:

  • reduces the specific energy consumption of the mill system by up to 15 percent
  • results in a steeper particle size distribution curve, especially with lower sieve residues on the coarse sieves (150, 200 μm and higher).

Petcoke can therefore be ground to a residue of 5 percent or less on the 90 μm sieve without causing excessive energy consumption. This enables increased petcoke firing rates, and improves pet coke utilisation for calciners.

RTKM separators come in sizes rated for capacities from 5 to over 100 tonnes per hour of finished product.

Swift and easy installation

In most cases when replacing an existing static separator, the RTKM separator can be fitted as a complete unit into the existing space with only minor adjustment of the duct work.

RTKM separator installation can be coordinated with a scheduled kiln stoppage. This feature, combined with the low initial cost, enerally makes it possible to recoup the investment in relatively short time.