SU678263A1 - Loose material cooling arrangement - Google Patents

Description

The invention relates to apparatuses for cooling cement clinker and other materials burned in kilns and can be used in the building materials industry. A refrigerator for cooling bulk material is known, comprising a pre-cooling well and a conveying grate with a supply of cooling air into the well and under the conveying grate 1. A shaft of width equal to the width of the conveying grate has a hinged lining wall on the unloading side that does not reach the conveying grate final cooling by an amount equal to the height of the layer of material at the last. The transport speed of the material in this grid is adjusted so that the material is scattered across its width in a uniform layer. The disadvantages of the known refrigerator are: 1, All the material, where there are large lumps, gets into the pre-cooling mixture, which prevents the creation of a fluidized bed, in which cooling is most effective. 2. When large lumps of material enter, the hinged wall rises last, which leads to a violation of the uniform distribution of the material across the lattice width (at the point of material dropping, the layer will be maximum, and along the edges the minimum, since the material with a larger deviation of the wall will not be enough to fill a large layer across the entire lattice width). In this case, the cooling efficiency is disturbed, since the greatest amount of air will pass in places where the layer is minimal, and where the layer is large, air will be odit very little, 3, impossibility of controlling the thickness of the layer on the conveying grate final cooling imosti in dependence on particle size distribution. The closest to the proposed invention is a device for cooling bulk material, comprising a pre-cooling shaft installed behind the rotary kiln with a classifier and conveying grid. The classifier is formed by a hollow partition equipped with blowing nozzles mounted on

one level with windows made in the vertical partition of the shaft, dividing it into a large fraction chamber and a settling chamber 2.

The disadvantages of the known cooler are that the entire clinker / falls into the classifier, and only then a stream of compressed air is blown into the precipitation chamber, which leads to high energy consumption for the production of compressed air, increased wear of the surfaces on which the clinker falls. Compressed air after entering the waste pipe is fed into the furnace with a temperature not high enough, because it does not have time to heat up during acute

blowing All this leads to heat loss and insufficient cooling efficiency.

The purpose of the invention is to increase the cooling efficiency.

The goal is achieved by the fact that the device for the erection of bulk material, containing a pre-cooling mine installed behind a rotating furnace with a classifier and a transporting grid, is equipped with a self-lining loading chute installed in the upper part of the mine, and an additional transporting grid located under the classifier made in the form of a chamber formed by a pointed upper wall and the side walls adjacent to it, inclined to the horizontal plane bones at an angle of 45-90.

FIG. 1 shows a longitudinal section of the refrigerator; FIG. 2 is a section A-A in FIG. one.

The furnace 1 is connected to the cooler 2 by the shaft 3. In the mine 3, under the furnace 1, there is a self-fusing heat 4.

At a distance of 30-150 mm along the axis of the refrigerator there is a lined wall 5 pointed upward, which, together with shaft 3 and lateral inclined at an angle of 45-90 to the horizon b, forms a chamber 7, under which a short conveying grid 8 is installed, the capacity of which is controlled by the sensor 9 of the upper level of the material in chamber 7. The air ducts 10, 11 are connected to the center. 7 The pointed wall B of the self 7 does not reach the short conveying grid 8 by an amount of 200-800 mm. This size is chosen from the condition of free exit of all material without jamming.

Under the short transport grill 8 there is a final cooling grid 12. Air duct 13 serves for the supply of cooling air under the grill 12, and air duct 14 - for extension 8, air duct 15 for emissions (if necessary) of aspiration air.

The refrigerator works as follows.

The material from the furnace 1 falls into the heat 4 and some of it remains in it as a lining, and the remaining one falls down, with the fine fraction 5 falling into the chamber 7, and large into the grate 12 due to the difference in their falling trajectories.

Pipe 4 is necessary because the furnace has an axial movement, which leads to a change in the trajectory of the clods of material and the possibility of hitting clods of larger size in the chamber 7.

Since the walls 6 of the chamber 7 have 5 inclinations at an angle x equal to 45-90 to the horizon, which is larger than the angle of repose of the material being cooled, the chamber 7 is completely filled with it to the level determined by sensor 9, while the grille 8 stands. Upon reaching this level, the grille B starts feeding the material onto the grille 12 (if the level of the material in the chamber falls below that detected by sensor 9, then the grille 8 first slows down, then stops).

The air entering through the air duct 10 creates a fluid bed in the upper part of the chamber and then goes to the furnace 1.

The air through the duct 11 and 14 is 0 through a layer of material on the grid 8 and then into the furnace 1.

The material from the grate 8 falls on the grate 12 along with large lumps, where, depending on the granulometric composition, any

the thickness of the layer of material due to the change in speed, and consequently effective cooling of the air supplied through the duct 13, and then it either goes into the kiln or is ejected through the duct 15 into the atmosphere — or is used to dry the raw material.

The use of this refrigerator provides effective cooling.

the material in the fluidized bed even when large lumps of material are brought from the furnace and its effective cooling on the grate 12 is due to an equal layer of the required thickness, which will provide fuel economy.

Claims (1)

Apparatus of the Invention A device for cooling bulk material containing a pre-cooling shaft installed behind a rotary kiln with a classifier and conveying grid, characterized in that, in order to increase cooling efficiency, it is equipped with a self-loading grille installed in the upper part of the shaft and an additional conveying grid located under the classifier, made in the form of a chamber formed by a vertical wall pointed at the top and adjacent side walls.