SU465537A1 - Mine heat exchanger - Google Patents

Description

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The invention relates to shaft heat exchangers used for the heat treatment of granulated and lumpy materials, for example, for drying and preheating cement raw materials, limestone and other building materials.

In a known heat exchanger containing a heat treatment chamber with a charging device, a distribution cone in the upper part, an annular gas duct and a central conical divider and a peripheral conical ring and discharge, located below it, a chamber with a flue gas channel, an even distribution of the gas flow over the section of the treated gas is not achieved material, a part of the supersaturated granules are scattered, which contributes to an increase in the dustiness, as a result of which the proper efficiency of oobmennika.

The purpose of the invention is to ensure uniform distribution of heat, the carrier over the cross section of the heat exchanger and the reduction of material granules.

This is achieved by the body: in the lower part of the heat treatment chamber. Co-located with the annular gas duct there is a gable ring, with its tip facing up.

FIG. 1 shows a shaft heat exchanger in section; in fig. 2 - section aa on f, u. one.

The heat exchanger consists of a housing 1 in which there is a heat treatment chamber 2, a loading device 3, a distribution cone 4, an annular gas duct 5, a central conical divider 6, a peripheral conical ring 7, discharge chambers 8, gas supply channels 9, and a gable ring 10 vertically 11. At the bottom of the discharge chambers, horizontal feeders lined with refractory material 12 are installed, protected by a reflective screen 13, and a material divider 14.

Mine heat exchanger works as follows.

The wet raw material charge entering the charging device 3 is evenly distributed over the annular space formed by the upper part of the housing 1 and the distribution cone 4, on which a constant level of the material forming the shutter is prevented against the outside air.

Descending along the distribution cone 4, the material is divided into two annular flows moving along the conical surfaces of the annular gas duct 5, central section

but fills the chamber with a thermal glue-2, forming a concave surface. under the annular gas duct. From the heat treatment chamber, the material enters the discharge chambers 8 and onto the platforms of the feeders 12. The height of the layer of material through which the gas flow passes in the heat treatment chamber is adjusted by changing the height of the annular gas duct 5 by means of an adjusting mechanism 15.

Hot gases from the rotary kiln enter the canals 9, divided into two streams, and are directed to the heat treatment chamber through the central duct 16 and the annular channel 17. Thus, the gases pass through the material evenly throughout the annular section of the heat treatment chamber, in which The layer of material, located at an angle of a natural slope using the distribution ring 10, has the same thickness in all sections of the chamber. Therefore, the material is uniformly suspended, heated, and partially decarbonized, and the gases enter the annular gas duct 5, from which the exhaust duct 18 through the collector 19 is removed from the heat exchanger. It is possible to install a gas flue that evacuates gas when the furnace is ignited into the atmosphere, using a heat exchanger mip.

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The material, after heat treatment with the help of horizontal feeders 12, "e destroying granules and chunks, is continuously fed into the kiln along the chute 20. The performance of the shaft heat exchanger is controlled by changing the number of swings and the amount of movement of the feeders 12, carried out by means of drive mechanisms. This makes it possible to synchronize the operation of the shaft heat exchanger and the rotary kiln;

Subject invention

A shaft heat treater for processing granulated and lumpy materials, such as cement raw materials, contains a heat treatment chamber with a charging device, a distribution cone in the upper part, an annular gas duct and a central conical divider and a peripheral conical ring and a discharge chamber with a gas feed duct, which is located below it. the fact that, in order to evenly distribute the heat transfer fluid over the heat exchanger section and to reduce the destruction of material granules, in the lower part of the chamber those sooono with a ring flue is located gable ring, facing upwards.

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