Outokumpu Oyj

Outokumpu Harjavelta Metals Oy

Pekka Tuokkola

Launo L Lilja

Vesa T&ouml;r&ouml;l&auml;

Heikki Teperi

Ismo Holmi

Kari Rajainmaki

Tuomo Jokinen

Lasse Valli

Jussi Sipil&auml;

Veli Salmi

The invention relates to a method for adjusting the flow velocity of reaction gas and the dispersion air of pulverous solids when feeding reaction gas and finely divided solids to the reaction shaft (,) of a suspension smelting furnace for creating a controlled and adjustable suspension. Reaction gas (,) is fed into the furnace from around a finely divided solid material flow (,), so that said solids are distributed with an orientation towards the reaction gas by means of dispersion air. The flow velocity and discharge direction of the reaction gas to the reaction shaft are adjusted steplessly by means of a specially shaped adjusting member (,) moving vertically in the reaction gas channel (,) and by means of a specially shaped cooling block (,) surrounding the reaction gas channel (,) and located on the arch of the reaction shaft. The velocity of the reaction gas is adjusted to be suitable, irrespective of the desired gas quantity, in the discharge orifice (,) located at the bottom edge of the reaction shaft arch (,), and from said orifice the gas is discharged into the reaction shaft (,) and forms there a suspension with the pulverous material, and the dispersion air needed for dispersing said material is adjusted according to the supply of the pulverous material. The invention also relates to a multiadjustable burner for realizing the method.

Method for feeding and directing reaction gas and solids into a smelting furnace and a multiadjustable burner designed for said purpose

The invention relates to a waste heat boiler construction provided in succession to a suspension smelting furnace, particularly a flash smelting furnace, in which construction the dust-bearing gases created in the suspension smelting furnace are prevented from directly flowing from the radiation section of the waste heat boiler into the convection section thereof, in order to reduce the tendency to dust build-ups caused by these gases, and in order to advantageously utilize the total volume of the waste heat boiler and to extend the residence time simultaneously. The invention also relates to a method for intensifying the mixing of gases and for extending the total residence time in the radiation section of the waste heat boiler.

Method and apparatus for increasing the efficiency of a waste heat boiler

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Harjavalta, Finland

Pekka Tuokkola