SU951049A1 - Kiln for calcining loose materials - Google Patents

Description

Union of Soviet Socialist Republics

USSR State Committee. for inventions and discoveries

DESCRIPTION OF THE INVENTION

TO AUTHOR'S CERTIFICATE (61) Additional to author. certificate-wu - (22) It is declared 06.01.81 (21) 3232144 / 29-33 with the addition of application No. - (23) Priority-

Published 1508.82. Bulletin No. 30

Date of publication of the description 15.08.82 (1.051049 (51) M.C. ^{1 * 3}

F 27 V 15/00 (53) UDC 666.3.

.041.548 (068.8) (72) Inventor E.V. Korovkin (71) Applicant (54) FURNACE FOR BURNING OF BULK MATERIALS

The invention relates to chemical engineering, namely to furnaces for firing bulk materials, and can be used for firing limestone, magnesite, phosphates, quartz - * sand, perlite, iron carbonate.

Known furnace for firing bulk materials in the form of a vertical pipe, which is fed to a hot carrier and bulk material. As the heat carrier and the material move together through the pipe, heating and heat treatment are performed £ 1].

The disadvantage of this furnace is the high temperature of the material and the heat-11 carrier at the outlet of the furnace, which requires the installation of special heat-exchange equipment to recover the heat of the processed material and waste heat carrier. 2 (

Closest to the technical nature of · the invention is a furnace containing a vertical pipe with upper and lower bottoms, an injection loading device, pipes for .21 inlet and outlet coolant. £ 2] ..

The disadvantage of this furnace is the presence of additional heat exchange devices to reduce the temperature of the material and the coolant at the outlet ^L from the furnace, which increases the cost of firing and increases fuel consumption.

The purpose of the invention is to reduce fuel consumption.

To achieve the goal, in the furnace for firing bulk materials containing a vertical pipe with upper and lower bottoms, an injection loading device, nozzles for supplying and discharging coolant, the vertical pipe is equipped with a bundle of tubes placed parallel to it, walls whose lower ends are led through the pipe wall and connected to the injector of the loading device, and a pipe for supplying additional coolant installed above the pipe yoke.

In addition, a perforated insert of refractory material is mounted in a vertical pipe, into the openings of which, through one, the upper ends of the tube bundle are inserted.

In FIG. 1 shows the proposed furnace, a longitudinal section; in FIG. 2 option to install the ends of the tubes in a perforated insert.

The furnace consists of a vertical pipe 1. A hopper 2 with a unloading device 3 is connected to the bottom of the pipe 1. A pipe 1 with a pipe 4 is connected by a cyclone to the unloading device 6. The unloading devices 3 and 6 are connected to the conveying unloading screw 7. Tubes 8 are placed inside the pipe, led to the pipes by their lower ends and connected to the injector 9. The injector 9 is connected to the fan 10 and the feed hopper J1 with the feeder 12. The upper ends of the pipe »side 8 do not reach the top of the pipe 1, forming a chamber 13, which is connected by a hot gas supply pipe 14 to τοπ-jQoy 15. The upper part of the pipe is provided with a lining 16, and the lower one can be covered with thermal insulation. Perforated insert 17 with holes 18 can be inserted into the pipes.

The furnace operates as follows.

By the fan 10, air is supplied to the tubes 8, which, having passed along the entire length of the tubes, enters the chamber 13. From the chamber, the air flows through the annular space of the pipe 1 to the pipe 4 and is discharged through the cyclone 5 into the at- * atmosphere. The furnace 15 is turned on, from which hot gases enter chamber 13, mix with air, and leave it along the annulus. At the same time, the air flowing through the pipes is heated, and the air and flue gases flowing through the annulus are cooled. After the temperature of heat treatment of the material is reached in chamber 13, the feeder 12 is gradually turned on and the material is fed from the hopper 11 into the injector 9. The material moves along the tubes 8 together with air, is heated and finally heat treated in the chamber 13. Then the mixture of material the annulus falls down the pipe 1, part of the material falls into the hopper 2. The remaining material is extracted from the 4Q in the hopper 5. The processed material is fed by unloaders 3 and b to the unloading auger 7.

Thus, the full use of heat contained in the heat-treated material and flue gases for heating fresh material and transporting gas is ensured.

If necessary, heat treatment is carried out at elevated temperatures or in order to exclude the use of heat-resistant steel for pipes, a perforated insert 17 is mounted in the pipe. In this case, the principle of operation of the furnace is maintained, except when moving. down 'gases and materials move under a free hole 18, not occupied by tubes 8.

The design of the proposed furnace allows you to almost completely use the heat of the heat-treated material and exhaust gases to heat fresh material and the gas transporting the material medium. Additional heat carrier is required only to compensate for the heat, the chemical reaction and heat loss through walls that are insignificant. Therefore, the heat consumption for heat treatment is reduced by 2-3 times compared with the known furnaces. Thus, the economic effect is achieved by reducing the fuel consumption by 2-3 times in the furnace.

Claims (2)

The invention relates to chemical engineering and, in particular, to kilns for firing loose materials, and can be used to burn limestone, magnesite, phosphates, quartz sand, perlite, iron carbonate. A known kiln for firing loose materials in the form of a vertical pipe into which a hot tellifier and a loose material are supplied. As the coolant and material move together through the pipe, heating and heat treatment is performed. The disadvantage of this furnace is the high temperature of the material and the carrier heat at the furnace exit, which requires the installation of special heat exchange equipment for recovering the heat of the treated material and the developed coolant. The closest to the technical essence of the invention is a furnace containing a vertical pipe with upper and lower bottoms, an injection device for a loading device, nozzles for supplying and discharging coolant 2. - A disadvantage of such a furnace is the presence of additional heat exchangers for reducing the temperature of the material and the coolant at the exit of the furnace, which increases the cost of firing and increases fuel consumption. The purpose of the invention is to reduce fuel consumption. To achieve the goal, in the kiln for firing bulk materials containing a vertical pipe with upper and lower bottoms, an injection loading device, pipes for supplying and discharging heat transfer fluid, the vertical pipe is provided with a bundle of pipes dimensioned parallel to it, the walls, the lower ends of which are led through the pipe wall and connected to the injector boot device, and a pipe for supplying additional coolant installed yad ify4KOM tubes. In addition, a perforated insert of refractory material is mounted in a vertical pipe, into the holes of which the upper ends of the tube bundle are inserted through one. FIG. 1 shows the proposed furnace, longitudinal section; Fig 2 option install the ends of the tubes in the perforated insert. The furnace consists of a vertical pipe 1. The lower part of the pipe 1 is connected to the hopper 2 with the unloader 3. The pipe 1 by the nozzle 4 is connected by cyclone 5 with the unloader 6. The unloaders 3 and are connected to the transporting unloading screw 7. Tubes 8 are located inside the pipe, the lower ends are connected to the pipes and connected to the injector 9. The injector 9 is connected to the fan 10 and the hopper J1 with a feeder 12. The upper ends of the pipe 8 do not reach the top of the pipe 1, chamber 13, which is connected to the furnace 15 by the hot gas inlet 14. The upper part of the pipe is provided with a lining 16, and the bottom can be covered with thermal insulation. A perforated insert 17 with holes 18 can be inserted into the pipes. The furnace operates as follows. The fan 10 supplies air to the tubes 8, which, having passed along the entire length of the tubes, enters the chamber 13. From the chamber, the air goes down through the annular space of the tube 1 to the nozzle 4 and is ejected / through the cyclone 5 into the atmosphere. Included in the operation is the furnace 15 from which the hot gases enter the chamber 13, mix with air and escape with it through the annular space. At the same time, the air going through the pipes is heated, and the air and flue gases going through the tube space are cooled. After the temperature of heat treatment of the material in chamber 13 is reached, the feeder 12 is turned on and the material is fed from the hopper 11 to the injector 9. The material moves along the tubes 8 with the air, is heated and finally thermally processed in the chamber 13. Then the mixture of material goes down the tube annulus part of the material falls into the hopper 2. The remaining material is released from the gas in the hopper 5. The treated material is supplied by the unloading facilities 3 and b to the unloading auger 7. Thus, the complete use of these heat contained in the heat-treated material; and flue gases to pre-heat the fresh material and carrier gas. If necessary, heat treatment is carried out at elevated temperatures or in order to exclude the use of heat-resistant steel for pipes of heat-resistant steel. Perforated insert 17 is mounted in the pipe. In this case, the operating principle of the furnace is preserved, except for the fact that during movement. downward, gases and materials move under the free opening 18, not occupied by the tubes 8. The design of the proposed furnace makes it possible to almost completely utilize the heat of the heat-treated material and the exhaust gases to heat the reduced material and the gas-transporting medium. Additional heat carrier is only required to compensate for the heat to the chemical reaction and. heat losses through the walls, which are negligible. Therefore, the heat consumption for heat treatment is reduced by a factor of 2-3 compared with known furnaces. Thus, the economic effect is achieved by reducing by 2-3 times the consumption of fuel in the furnace. Claims Furnace for burning loose materials, comprising a vertical pipe with upper and lower bottoms, an injection loading device, nozzles for supplying and discharging heat carrier, in order to reduce fuel consumption, the vertical pipe is equipped with a bundle of pipes, placed parallel to its walls, the lower ends of which are brought out through the pipe wall and connected to the injector of the loading device, and the pipe for supplying an additional coolant — installed above the beam of tubes. 2. The furnace according to claim 1, characterized in that a perforated insert of refractory material is mounted in a vertical pipe, and the upper ends of the bundle of tubes are inserted through the holes in one. The source of information received so attention during the examination 1. German application No. 2600254, cl. F 27 V 1/02, published. 1977. i. USSR Author's Certificate No. 523994, cl. F 27 B 15/00, 1971. f3 is