technical NOTES

Description FLSmidth KHD Humboldt

Wedag

Thyssen Krupp

Polysiyus

Type of Technology
/Equipment

Hot Disc PyroRotor Prepol - SC

(Step combustor)

Procedure
adopted

AF is fed into Hot disc

is a slow speed rotary

disc installed near the

calciner bottom area.

Raw meal is fed, just

near to AF feeding

point & Tertiary air is

drawn from cooler

A small rotary tube is

install in precalciner

and part of Raw

meal feed, AF and

tertiary air is passed

through this tube

finally goes to Cal-

ciner

A small inclined

combustion grates

Is installed to feed

AF with air cannons

at the bottom. AF is

fed in this by feeding

screw and part of

Raw meal is fed, just

above AF feeding

point & Tertiary air is

drawn from cooler

Types of AF can
be used

• Waste oil, Animal
  Meal


• Bio mass


• Plastic/paper
  sludge


• RDF/Fluff


• Tire chips


• Whole tyre


• wood waste
  
  
  • Waste oil, Animal
    Meal
  
  
  • Bio mass
  
  
  • Plastic/ paper
    sludge
  
  
  • RDF/Fluff
  
  
  • Tire chips
  
  
  • Whole tyre
    
    
    • Waste oil, Animal
      Meal
    
    
    • Bio mass
    
    
    • Plastic/ paper
      sludge
    
    
    • RDF/Fluff
    
    
    • Tire chips
    
    
    • Whole tyre
    
    
    
    
  
  
  
  

Size of AF used
(mm) < 300 < 300 , 3D < 300
% TSR on PC coal
requirement 80-90 >98 80-90

Process covered

Heating up, drying,

degasification,

ignition

Heating up, drying,

degasification,

ignition

Heating up, drying,

degasification,

ignition

Residence time of
AF ( Minutes )

Residence time 3 –

45 min., depending

on Speed and

therefore on fuel

capacity.

Residence time 5 –

15 min., depending

on Speed and

therefore on fuel

capacity.

Residence time ~ 15

min., depending on

fuel feed rate.

Speed required 0.33 RPM Max 0.3-3 RPM
Pneumatic transport.
No moving parts