SU1575039A1 - Device for cooling cement clinker - Google Patents

Abstract

The invention relates to the building materials industry, primarily to devices for cooling cement clinker. The aim of the invention is to increase the activity of clinker by supplying air from the shaft directly to the layer of material in the sintering zone. The profiled screen 4 is installed in the vertical shaft of the clinker cooler 2 under the nozzle 3. The screen tilt angle is 45-70 ° relative to the axis of the rotary kiln 1. The profiled screen is rotated 20-40 ° to the horizontal in the direction of the kiln rotation. 2 ill., 1 tab.

Description

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The invention relates to the building materials industry, primarily to devices for cooling cement clinker,

The aim of the invention is to increase the activity of clinker by supplying air from the shaft directly to the layer of material in the sintering zone.

Fig. 1 shows the layout of the profiled screen in the vertical shaft of the clinker cooler; FIG. 2 is a section A-A in FIG. 1 (when the screen is turned 20-40 ° to the horizontal in the direction of rotation of the furnace).

The device comprises a rotary kiln 1, a vertical shaft of a clinker cooler 2, a nozzle 3, a profiled screen 4.

The device works as follows

| The profiled screen 4 is installed in the vertical shaft of the clinker cooler 2 under the nozzle 3. The screen tilt angle is 45-70 relative to the axis of the rotary kiln 1, which determines the length of the intensive cooling zone of the clinker in the furnace, which is 5-12 m. The length of the clinker cooling zone in the rotary kiln depends on the location of the nozzle and the shape of the torch, which can be changed by the machinist of the rotary kiln when conducting the firing process. Consequently,

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installed and fixed when installing the profiled screen.

Secondary air flow directed to the lower part of the furnace, filled with clinker using a screen, extracts heat from the clinker layer. As a result, secondary air enters the kiln, which is additionally heated upon contact with a layer of clinker, and clinker with a lower temperature is loaded into the cooler.

When secondary air is supplied to the lower part of the kiln, accelerated heat removal from the moving clinker in the cooling zone occurs. Due to this, the temperature of the clinker on the kiln cut-off decreases from 1220 to 1030 ° C. Thus, the temperature gradient of the cooling of clinker is (1350-1030), OaC / m. At the same time, the fuel consumption for clinker burning remains unchanged,

The rapid cooling of the clinker in the kiln increases the content of the elite, reduces the content of the belite phase and the phase of celite, the clinker acquires a fine-crystalline structure with well-formed crystals, increases the activity of the clinker and the cement produced from it, Comparative data are tabulated

Thus, the proposed method for cooling the clinker will improve the quality of the final product (cement)

change of the slope of the profile-35 by increasing the cooling rate0

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installed and fixed when installing the profiled screen.

The secondary air flow directed to the lower part of the kiln by the screen, filled with clinker, draws heat from the clinker layer. As a result, secondary air enters the kiln, additionally heated upon contact with a layer of clinker, and clinker having a lower temperature is charged to the cooler.

When secondary air is supplied to the lower part of the kiln, accelerated heat removal from the moving clinker in the cooling zone occurs. Due to this, the temperature of the clinker on the kiln cut-off decreases from 1220 to 1030 ° C. Thus, the temperature gradient of the cooling of clinker is (1350-1030), OaC / m. At the same time, the fuel consumption for clinker burning remains unchanged,

The rapid cooling of the clinker in the furnace increases the content of the elite, reduces the content of the belite phase and the phase of celite, the clinker acquires a crystalline structure with well-formed crystals, the activity of the clinker and the cement produced from it increases. Comparative data are tabulated

Thus, the proposed method for cooling clinker improves the quality of the final product (cement)

screen within 45-70 ° allows changing the length of the intensive cooling zone,

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FIG. 2 shows that the profiled screen is rotated by 20-40 ° to the horizontal in the direction of rotation of the furnace. The limits are chosen based on the inclination of the plane of repose of the rolling clinker along the wall (circumference) of the rotary kiln. This angle depends on the granulation of the clinker and its grain size distribution. composition and, as a rule, for the raw material of one deposit, the lining scheme and longitudinal profile of the furnace remains unchanged. Thus, this angle is determined experimentally for a specific product.

no clinker at a more important stage — in the kiln, when the final processes of clinker phase formation occur,

Claims (1)

Invention Formula A device for cooling cement clinker, which contains a grate and a shaft, characterized in that, in order to increase the activity of clinker by supplying air from the shaft directly to the material layer in the sintering zone, it is equipped with a shaped screen installed at an angle of 45-70 relative to the axis of the furnace and turned 20-40 ° to the horizontal in the direction of rotation of the furnace. Length of clinker cooling zone in kiln, m The temperature of the clinker at the edge of the furnace, ° C Temperature gradient of cooling, deg / m 12.0 8.0 1220 1030 10.8 40.0