SU949315A1 - Device for heat treatment of polydispersed material - Google Patents

Description

(54) DEVICE FOR HEAT TREATMENT OF POLYDISPERSE MATERIAL

one

The invention relates to devices for the heat treatment of dispersed materials, in particular shell lime, and can be used in metallurgy, construction and other areas of technology.

A device for heat treating a material is known. It is a housing with nozzles for injecting the material and fuel being processed, a nozzle for withdrawing material and gas separated by a partition into the upper and lower chambers, the opening in the partition being made offset to the wall of the housing. parts of the body is gas distribution grid 1.

A disadvantage of the known device is its low firing efficiency of the material due to the rapid removal of material from the lower chamber by the upward flow of the coolant.

The closest in technical essence to the present invention is a device for heat treatment of a polydisperse material comprising a chamber of the first calcination stage, made in the form of a cyclone, and a chamber of the second stage with outlet nozzles connected by a channel.

made in the form of central, and annular coaxial nozzles separated by a partition, tapering towards the chamber of the second stage 2.

The disadvantages of this device include the inability to control the residence time of large fractions of the processed material in the lower chamber, especially known as a shell, which has a lamellar form, which reduces the quality of firing.

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The aim of the invention is to increase the degree of processing of large fractions of the material.

The goal is achieved by the fact that 15 in the device containing the chamber of the first stage of burning, made in the form of a cyclone, and the camera of the second stage with outlet pipes, interconnected by a channel made in the form of central and ring axial nozzles separated by a septum The second stage, the connecting channel is provided with a nozzle, the output end of which is placed in the chamber of the second stage, and the discharge pipes are set tangentially, while

nozzles are made with a height equal to 2-3 diameters of the outlet pipe.

FIG. 1 shows a device for the heat treatment of a polydisperse material; in fig. 2 - section aa

The device consists of an upper chamber I (first stage), made in the form of a cyclone, connected to the lower chamber 2 (second stage) by a connecting channel, which contains a central channel 3 and an annular canal 4, separated by a partition 5. The connecting channel is equipped with a nozzle 6 , the output end of which is located in the lower chamber 2. The branch pipes 7 of the heat carrier gas are connected to the upper chamber 1 in its upper part tangentially and to the lower chamber 2 are also brought down from the bottom tangentially. The nozzle 8 for loading the processed material is connected to the lid of the upper chamber 1. The exhaust nozzles 9 for removing the material with the heat-transfer gas are installed tangentially in the upper part of the lower chamber 2. Moreover, the number of the exhaust nozzles 9 does not significantly affect the performance of the device can be selected on the basis of the design features of the gas cleaning system from one to two, four or more (two outlets 9 are shown in the drawing).

The device works as follows.

The processed material enters the chamber 1 of the first stage through the pipe 8 into the stream of high-temperature flue gases leaving the pipe 7. At the same time, the particles of the material are twisted and under the action of the centrifugal forces are separated into the walls of the camera 1 and further along its bottom into the connecting channel . More precisely, the particles enter channel 4 and the flue gases enter channel 3. As a result of injection, the material passes through the nozzle 6 into the lower chamber 2 at a higher rate. Here it is subjected to additional processing in the upward flow of flue gases. Moreover, placing the nozzle 6 with a height equal to 2-3 diameters of the outlet nozzle in the lower chamber 2 completely eliminates the dramatic expansion of the flue gas stream at the exit from the upper chamber 1 and the removal of particles into the outlet nozzles 9. In addition, as a result of tangential installation of The nozzles 9 flue gases are twisted and in the space between the nozzle 6 and the walls of the chamber 2 the particles are separated by the centrifugal forces on the wall.

moving along which in the lower conical part of chamber 2 the flue gas is picked up again. Thus, as a result of repeated circulation of material, the residence time of large particles of material in the zone of high temperatures significantly increases. The discharge of burned coarse particles takes place in the lower cone of chamber 2.

When the height of the nozzle is less than 2 diameters of the outlet nozzle, there is a sharp expansion of the gas flow, which worsens the separation of large particles and increases the heat treatment time. Increasing the height of the nozzle more than 3 diameters, the air leads to an increase in the hydraulic resistance of the chamber.

The invention makes it possible to increase the degree of heat treatment of coarse fractions of the material, for example, shell lime, by increasing the residence time in the

The second stage chamber as a result of repeated circulation of the material, achieved by placing a second stage nozzle in the chamber with a height of 2-3 diameters and a branch pipe, as well as installing branch pipes tangentially. So

thus, the degree of calcination of the entire polydisperse material is increased.

Claims (2)

1. USSR author's certificate number 630509, cl. F 27 B 15/00, 1978. 2. USSR author's certificate number 681311, cl. F 27 B 15/00, 1978.