SU966473A1 - Cyclone chamber for thermochemical processing of finely divided raw materials - Google Patents

Description

() CYCLONE CHAMBER OF TERMOCHEMICAL PROCESSING OF FINE-GROUNDED RAW MATERIALS

The invention relates to devices for thermochemical processing of materials, in particular to cyclone furnaces, and can be used in the chemical, metallurgical and food industries.

A known cyclone dryer for granular materials, comprising a cylindrical cyclone chamber with a nozzle for tangentially introducing a mixture of dried material with heat carrier and a discharge nozzle connected to the chamber along its axis Cl.

The disadvantages of such a furnace are that, when fed into the peripheral zone of the swirling flow, the suspension under the action of centrifugal forces moves only along the walls of the cyclone chamber, not filling its remaining volume. Therefore, the heat exchange between gas and particles in such a chamber is not intense enough. In addition, an increased abrasive wear of the wall is observed at the point of entry of particles.

the apparatus, since particles are introduced into the chamber at a considerable speed and hit the same place,.

A two-stage cyclone kiln is also known, the cylindrical firing chamber of which has tangential slots for introducing hot heat carrier and air, and in the top cover three points for feeding solid material 2.

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However, the conditions for maximum heat exchange between the gases and the solid suspension are also not provided in this chamber, since the particles are supplied to the peripheral region and do not absorb the entire volume of the suspension moving along the wall.

The closest in technical essence to the present invention is a device for thermally treating a material2 (J ala containing a cylindrical body with a lid 15, a pipe for introducing the material being processed, not installed at the lid, and a tangential pipe for supplying heat transfer fluid located in the upper part of the body, a pipe for withdrawing material and gas, located in the lower part of the housing f3. However, this design does not provide the conditions for the most intensive heat exchange between gases and raw materials, the complete filling of the volume and chambers and uniform separation of particles onto its walls. In this device, the material not fed along the axis of the swirling flow is quickly separated onto the wall and moves along it with a helical rope not filling the main volume of the chamber. In connection with these, the material is mixed with the heat carrier and, accordingly , the heat exchange between them is not efficient enough. The abrasive wear of the walls is uneven and is particularly significant in the areas of the first impact of particles on the wall. The purpose of the invention is to intensify heat and mass exchange between gas, gas and the material to be processed and to reduce the uneven abrasive wear of the chamber walls. - The above objective is achieved by the fact that a cyclone chamber for thermochemical processing of finely divided raw materials containing a cylindrical body with a lid, a nozzle for inserting material mounted on a cylinder, a tangential nozzle for supplying a gas coolant, a nozzle for unloading the processed material and exhaust gas, A nozzle for insertion of the material is set from the axis of the chamber at a distance equal to 0,, 2 of the radius of the chamber, and in relation to the tangential nozzle for supplying the gas heat carrier with displacement along the flow gas coolant, equal to 250-270 ° C. The need for displacement of the inlet nozzle is due to the fact that in this place there is an axis of symmetry of the twisted flow that takes place in cyclone chambers with one-sided air supply. The fact that in such chambers the axis of symmetry of the flow does not coincide with the geometric axis of the chamber was confirmed by numerous experiments conducted in studying the separation of particles. FIG. 1 shows a cyclone chamber, a longitudinal section; in fig. 2 a cut A-A in FIG. 1. The chamber contains a cylindrical body 1, a tangential nozzle 2, a pipe 3 for removing material and gas, a pipe 4 for feeding material. The cyclone chamber is pa () as follows. Through the nipple, the raw material is fed into the body K. At the indicated cflide of the nipple k for introducing the material with respect to the tangential nozzle 2 for supplying the gas heat carrier, the material is introduced into the center of the vortex created by the heat carrier. As a result of this material supply in the process chamber, the uneven distribution of the dispersed material in the chamber volume decreases and, as a result, the heat exchange between the material being processed and the coolant increases, and the uneven abrasive wear is reduced and the operating period of the chamber is increased. The results of experimental studies on the firing of tin concentrate in order to remove the mouse in pilot plants with a diameter of 0.5 m, differing in the location of the material input pipe within the specified limits are tabulated.

Table continuation

Claims (3)

SUMMARY OF THE INVENTION A cyclone chamber for thermochemical processing of finely ground raw materials, comprising a cylindrical body with a cover, a nozzle for introducing material mounted on the cover, a tangential nozzle for supplying a gas coolant, a nozzle for Phi * / VNIIPI Order 7824/55 along the gas coolant flow, equal to 250 -270 °. 30 Sources of information> taken into account direct examination 1. USSR copyright certificate No. 315888, cl. F 26 B 17 / S, 1967. 2. USSR copyright certificate 35 No. 505867, cl. F 27 B 15/00, 1974. 3. Copyright certificate of the USSR No. 630509, class. F 27 B 15/00, 1972 (prototype). Subscription Circulation 645 Branch of PPP Patent, Uzhhorod, st. Project, 4