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Stone Wool

PROCESS DESCRIPTION

The raw material main components are basalt and coke, minor components are limestone and dolomite.  These components are directly charged from the top of melting aggregates - mainly shaft furnaces, but also electric arc furnaces and smelter with submerged combustion. The basalt is melted at temperature of 1500 - 1550 °C and is leaving the furnace on the bottom to the fiberizer, which makes web of fibers. The collected web is transferred to a curing oven at 230 - 250 ºC.

GAS APPLICATION

Cupola Furnace:

- Oxygen enrichment / oxygen lancing

Advantages:

  • Increased melting rates
  • Reduced coke rate
  • Reduction of the specific energy consumption
  • Reduced melting costs
  • Lower amount of exhaust gas
  • Lower environmental impact of the emissions
  • Reduced material loss
  • Increase tapping temperature
  • Symmetrical temperature distribution across the furnace cross section
  • Utilization of dust and carburizing agents
  • Increased flexibility by altering the blast

Forehearth:

- Oxy-Fuel Burners

Are used to homogenize the temperature of the liquid melted stream and protect from “nose building" effect.

 

Messer Solution

Oxygen Enrichment

Oxygen is directly introduced into the air blast. The oxygen regulation communicates directly with the furnace regulation in order to keep a constant oxygen enrichment rate (normally between 1,5 and 3%) of the blast.

  

Oxijet – Lancing

Oxygen is introduced into the process via lances positioned in the wind tuyeres. Depending on the application different speeds of oxygen can be used. The oxygen regulation communicates directly with the furnace regulation in order to keep a constant oxygen enrichment rate (normally between 1,5 and 3%) of the blast.

 

 

with oxijet

Blast

Nm³/h

- 16%

coke rate

%

-23%

Oxygen

Nm³/t

21

melting rate

t/h

+28%

tapping temperature

°C

+2,4%

 

Messer has more than 30 installations of oxijet-systems in cupola furnaces, among these are in stone wool production

Pulsating Oxijet

Oxygen is introduced through lances into the furnace at supersonic speed. In order to reach the speed of oxygen, so called “laval nozzles" are used, which reach the needed impulse just at a defined pressure/flow ratio. The needed oxygen volume, for the process, can be obtained by pulsation of single lances or groups of lances.

Oxipyr – Burner System:

  • Oxipyr P
  • Oxipyr F

Oxipyr - Burner Regulation:

  • Oxipyr - Basic+, Basic regulation