Branches

Blast furnace

Blast furnace plant with burdening, conveyor burdening, coal injection system

Blast furnace burdening
Several thousand tons of material per hour are handled during preparation and blending of the burden and charging the blast furnace.
KÜTTNER supplies machinery and systems for conveying, batching and blending the various burden materials.
The blast furnace is fed via a computer controlled conveyor system, utilizing belt conveyors.

Coal injection plant

Coal injection – dense phase conveying
State of the art blast furnaces feature pulverized coal injection (PCI) systems. The injection of up to 200 kg of coal per ton of hot metal  replaces nearly the same amount of coke and therefore reduces production cost of the blast furnace iron.
New developments such as the Oxi-Coal-System, two lances per tuyere, pre-heating of the coal to be injected and a high conveying gas load result in increased injection rates of pulverized coal. With the injection system developed by KÜTTNER plugging is avoided. Abrasion  of the piping is minimal.
The processing of the raw coal to injection quality is achieved in a coal grinding and drying plant. The hot stove waste gas or the combustion of blast furnace top gas can be employed as heat source for drying. The milling takes place in either a vertical mill or a hammer mill, depending on the required grain size. The pulverized coal is separated in a bag filter.
KÜTTNER has delivered plants for hard coal and blends with volatiles between 8-42 Vol% and Hardgrove indices of 40-95 ºHGI.

Waste heat recovery system

Waste heat recovery
KÜTTNER-GHW supplies various, reliable waste heat recovery systems for pre-heating fuel and combustion air for hot blast stoves of blast furnace plants. In order to obtain temperatures for hot blast between 1100 and 1300 °C economically, for the benefit of the owner.