SU1020738A1 - Plant for smelting raw material - Google Patents

Abstract

INSTALLATION FOR MELTING THE MATERIAL, predominantly cement raw mix, containing an induction melting chamber with a preheating device, characterized in that, in order to simplify and reduce energy intensity, the preheating device is made 8 of the bottom and central electrodes, and the installation is equipped with vertical guides, on which the walls of the melting chamber and the central electrode are fixed, installed with the possibility of reciprocating movement along the guides. with S (L with

Description

The invention relates to devices for melting a material, preferably a raw mix, in the preparation of a melted cement clinker and can be used in the cement industry.

A device for producing fused cement clinker is known, comprising a melting chamber with a movable upper electrode, a lower electrode in the form of a chamber bottom, a loading device, and an electric power unit 1

The disadvantages of the known device are the considerable consumption of the moving electrode and the melt contamination with carbon compounds, the creation of a reducing atmosphere, the duration and non-uniformity of heating and melting of the charge. All this leads to a lack of efficiency in the smelting process.

The closest in technical essence and the achieved result is a melting installation containing an induction melting chamber with a preheater in the form of a burner.

However, when using a burner, it is practically very difficult to melt the cement clinker, and the burner and fuel and oxidizer supply system in. Such a case is difficult, since to create the necessary temperature for melting the Portland cement clinker, it is necessary to supply oxygen to the burner, and the burner itself. device to provide affective thermal protection system. Equipment for supplying oxygen to the burner is very difficult. It is unsafe to maintain.

The great difficulty is represented by the cooling system of the burner unit, which moves in space, and additional energy expenditures are needed to obtain oxygen and to circulate water when the heating system is cooled. In addition, during fuel combustion, heat loss to the environment with waste gases and cooled water is unavoidable, which is not the case with arc melting. The installation should be equipped with a gas evacuation system with a smoke exhauster.

The purpose of the invention is to simplify and reduce the energy intensity of the installation.

This goal is achieved by the fact that in a plant containing an induction melting chamber with a preheating device, the latter is made in the form of bottom and central electrodes, and the plant is equipped with vertical guides, on which the walls of the melting chamber and central

0 the upper electrode, installed with the possibility of reciprocating movement along the guides.

Fig, 1 schematically shows an installation with the camera lowered and

5 electrode; 2 - the same, with a raised chamber and an electrode.

The installation consists of an induction melting chamber 1 installed in the guides 2 for vertical movement by means of mechanism 3- A bottom electrode 5 is installed on the bottom of the melting chamber 1, an induction coil 6 and a three-phase winding 7 are located coaxially with camera 1.

5 Central movable electrode 9 is installed in the boot device 8 of the camera 1,

Power is supplied from the electric power unit 10,

0 The installation works as follows.

The cement raw mixture is poured in a small layer through the charging device 8 into the melting chamber 1, the electrode 9 is lowered to the bottom electrode 5 along which voltage is applied from the unit 10, as a result of which an arc is ignited, the melting of the raw mixture occurs, which is now continuous enters the chamber 1. The appearance of the melt further allows for induction heating and melting of the raw material mixture using an induction coil fed from the unit 10, wherein the electrode 9 is moved along the guides 2 with the HELP: The mechanisms 3, is removed from the melt, the arc between the electrodes 5 and 9 goes out. This prevents contamination of the melt with calcium carbide and the creation of a reducing atmosphere in the zone of clinker formation. In addition, the melting zone from the arc is limited to a value equal to two electrode diameters. At 5 Induction heating and melting, heating proceeds in the entire volume of the melt, intensively drawing new regions of solid material into it. 3 When the chamber 1 is filled with the melt, it is raised by the mechanism 3 along the guides 2 and the melt begins to pour, for example, into the granulator. Thus, the continuity of the melting process is created. The three-phase winding 7 is switched on by unit 10 simultaneously or shortly after the induction coil b is turned on and the rotating magnetic field induced by eddy currents mixes the melt and further warms it up, which intensifies melting and reactions in the melt ..

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Claims (1)

INSTALLATION FOR MELTING MATERIAL, mainly cement raw mix, containing an induction melting chamber with a pre-heating device, characterized in that, in order to simplify and reduce energy consumption, the pre-heating device is made in the form of bottom and central electrodes, and the installation is equipped with vertical guides on which the walls of the melting chamber and the central electrode are fixed, installed with the possibility of) reciprocating movement along the guides. o>