SU934169A1 - Tunnel kiln for heat treatment of manganese-zinc ferrites - Google Patents

Description

(5) TUNNEL FURNACE FOR HEAT TREATMENT OF MANGANESECNIC FERRITES

I

The invention relates to the field of metallurgy, in particular, to equipment for the thermal processing of powder products, namely, tunnel kilns for the heat treatment of manganese zinc ferrites.

A famous oven for heat treatment of products from powder, comprising preheating, sintering and cooling chambers, a conveyor for moving products, loading and unloading devices.

The disadvantage of this furnace is low productivity, due to the fact that the products are installed on the conveyor belt in one row, as well as the short service life of the conveyor belt.

The closest in technical essence and the achieved result to the proposed is a tunnel furnace for heat treatment of manganese-zinc ferrites, containing successively located preheating, sintering and cooling chambers, trolleys installed on rails, overtaking path and gas supply system to the cooling chamber with gas inlets 2 .

The disadvantages of the known furnace are that the design of the furnace does not ensure reliable isolation of the preheating chamber (burning).

10 bales) from the sintering chamber, as a result of which the decomposition products of the binder may enter the sintering zone, which reduces the quality of the sintered products.

AND

Claims (2)

In addition, the system for supplying gases to the cooling chamber, made in the form of nozzles perpendicular to the axis of the furnace, does not provide intensive circulation of the atmosphere in the cooling zone, which reduces the productivity of the furnace. It is also possible the ingress of air from the car space. 393 The purpose of the invention is to improve the quality of sintered products and the productivity of the furnace. The goal is achieved by the fact that in a furnace containing successively located preheating, sintering and cooling chambers, trolleys mounted on rails, an overrunning path and a system for supplying gases to the cooling chamber with gas supply pipes, the gas supply system is equipped with perforated pipes for filling the neutral space of the vehicle space, the gas supply pipes are located on the opposite walls of the chamber with a height shift, and the middle pipes on one of the walls are installed The ZO-CHO angle to the vertical is potassium, the other is at an angle of 10-150, and the preheating chamber is designed as an independent module and is located on the overtaking path. Separating the preheating chamber (burning the binder) from the pre-heating and cooling chambers helps prevent contamination of the atmosphere in these zones with water vapor released during the drying of the products, as well as with the combustion products of the binder, and its location on the overtaking path allows reduce the length of the furnace or at the same length to increase its productivity and removal of products from 1 m of production area. Filling the space under the car with the cooling chamber with a neutral gas eliminates the uncontrolled flow of oxygen from the air into the canal of the cooling chamber. FIG. 1 shows schematically the proposed furnace, FIG. 2 is a section A-A in FIG. one; in fig. 3 is a section B-B in FIG. 1. Lying consists of a chamber, 1 preheating (burning the binder), located on the overrunning path 2 and equipped with a system 3 of vapor suction and binder burnout products, chambers 4 and 5 sintering and cooling, respectively, located in a common hermetic casing. The gas supply system 6 is designed in such a way that the gases are supplied to the working channel of the cooling chamber from two opposite sides on three levels, creating a circular motion of the medium along the cross section of the channel. 4 The lower nozzles 7 are located 60-180 mm to the right above the level of the trolleys, the upper nozzles 8 are located 60-180 mm to the left above the upper level of the product cage, and the middle nozzles 9 are in the middle of the set. The middle nozzles 9 on one of the walls are installed at an angle SO-tO to the vertical, on the other 140-150, and the nozzles 7 and 8 are perpendicular to the axis of the furnace. The trolleys 10 are moved along the axis of the furnace channel and the overrunning path 2 by means of pushers 11 and 12. At the exit of the furnace there is a lock chamber 13 with two shutters. The carriage space of the cooling chamber 5 is cut off from the carway space of the sintering chamber k with a curtain of neutral gas that fills the entire carriage clearance space in this chamber. The furnace also contains the transfer carriage 15 and the casing 16. The furnace works as follows. The train of cars 10 with products loaded on the overrunning route 2 is pushed into the chamber 1 by the pusher 12, preheating and burning the binder, where the heating (up to), exposure and cooling of the products (up to 200 ° C) occurs. Binding and moisture vapors are emitted into the atmosphere by suction system 3. The trolleys 10 are transferred by means of the transfer carriage 15 to the plunger 11 and with its help they first enter the sintering chamber k, then the cooling chamber 5, where sintering of the products and cooling in the controlled gaseous environment takes place. At the approach of the trolley 10, the signal for opening the first gate and a pusher with accelerated travel (not shown) is fed to the sluice chamber 13, the trolley 10 is fed into the lock chamber 13. jacket 16 for further cooling. After this, the second shutter closes, the sluice chamber 13 is continuously flushed with nitrogen. The atmosphere in the furnace is created by blowing nitrogen and air at a number of points along the length of the furnace according to the scheme indicated in FIG. 1, 2 and 3. The use of the proposed. Furnace will allow to increase productivity, 5 times in comparison with the known ones and to increase the yield of suitable sintered products by 10%. Claims Tunnel furnace for heat treatment of manganese-zinc ferrites, containing successively arranged preheating, sintering and cooling chambers, trolleys mounted on rails, overrunning pathway and gas supply system to the cooling chamber with gas inlet pipe M, In order to improve the quality of the sintered products and the productivity of the furnace, the gas supply system is equipped with perforated pipes for filling the space between the firing space f with a neutral raaoMi gas supplying The nozzles are located on opposite walls of the chamber with an offset — in height, the middle nozzles on one of the walls are set at an angle to the vertical, on the other at an angle of UO-ISO, and the preheating chamber is made as an independent module and is located on the overtaking path. Sources of information taken into account in the examination 1. t. Browns et cl., United States of America, beginning of the 80-ft slnterlhg furnaces tnd Heat, 1969, 3 &, p. 2336-23 2. 2. German application fT, F 27 В 9/12, 1978. КЛ. /