RU1823864C - Method of cement clinker firing - Google Patents

Abstract

Usage: building materials industry, heat treatment of granular products. SUBSTANCE: method for production of cement clinker includes feeding dried granular material to a rotary kiln while feeding one part of fuel to the preparation zone, another part to the flare zone and subsequent dust cleaning of exhaust gases, feeding the material deposited after dust cleaning to the sintering zone of an additional rotary kiln, exhaust the gases of which are directed to the drying zone of the material. 1 il .. 1 tab.

Description

The invention relates to the heat treatment of granular materials, such as granular cement raw materials, limestone, pellets, and can be used in the building materials industry, in the chemical, metallurgical and other industries.

An object of the invention is to increase productivity.

The drawing shows a diagram of the proposed method. The method is carried out as follows.

Material from the drying zone 1 in the direction of arrow 2 enters the rotary kiln 3 and sequentially passes through the preparation zone 4, the calcination zone 5 and along arrow 6 the finished product (e.g. clinker) is discharged from the furnace. The coolant in the direction of arrow 7 is fed into the preparation zone 4, where the fuel is stratified and filtered through the layer together with the exhaust gases from the firing zone and small decarbonized

particles in arrow 8 enters the zone of coarse dust cleaning. where 80-90% of the dust particles are deposited, and the cleaned exhaust gases in the direction of arrow 10 are directed to a further dust-cleaning zone and then removed to the atmosphere (not shown in Fig.). The heated and decarbonized material deposited in the coarse dust cleaning zone 9 in the direction of arrow 11 is sent for refinement to the short rotary kiln 12, which is mainly represented by the sintering zone, and the product obtained in this furnace is discharged in the direction of arrow 13 from the process. The flue gases from the rotary kiln are directed along arrow 14 to the drying zone and from there along arrow 15 to dust cleaning. Sintering of the material is carried out in both rotary kilns during the flaring of fuel.

The supply of the material deposited after dust cleaning to the second rotary kiln allows the heated and decarbonized material to be burned in the rotary kiln, which contains mainly a special zone

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neither. Such an organization of firing eliminates the ingress of fine material into the zone of layer-by-layer burning of fuel, which stabilizes its operation and the firing process as a whole. The supply of exhaust gases from the second sintering zone in a rotary kiln to the drying zone of the material makes it possible to rationally use heat with high thermal efficiency.

EXAMPLE 1 A granular raw cement mixture with solid fuel was dried and then fired before sintering in a pilot rotary kiln with layer-by-layer combustion of fuel. The firing was carried out in prototype mode.

Example 2. Same as Example 1, but the exhaust gases from the rotary kiln were subjected to coarse dust cleaning in a cyclone, and the pulverized particles decarbonized and heated in the first rotary kiln were processed in a second rotary kiln. Calcination was carried out in the method of the claimed method.

The test results are shown in the table.

As can be seen from the table, the proposed method allows to increase the productivity of the process by 20%. and thermal efficiency by 10%.

Claims (1)

The claims A method of firing a cement clinker, comprising preparing and drying granular material, feeding it to a rotary kiln while feeding one part of the fuel to the preparation zone, the other part to the flare zone and subsequent dust cleaning of the exhaust gases, characterized in that, in order to increase productivity, the material deposited after dust cleaning is fed into the sintering zone of an additional rotary kiln, the exhaust gases of which are sent to the drying zone of the material.