SU842108A1 - Device for heating blasting of blast furnace - Google Patents

Description

(54) DEVICE FOR HEATING OF A DOMAIN FURNACE BREAD

one

The invention relates to iron metallurgy, specifically to devices and methods of high-temperature heating to blow for blast furnaces, and can be used also when heating air for MHD power plants. °

Closest to the proposed, technical essence and achievement of the IMJM results is a device containing series-connected countercurrent heat exchangers with refractory nozzles. The products of combustion of fuel burned in a burner installed prior to the first heat exchanger along the products of combustion are successively passed through both heat exchangers. The heated blast is passed through both heat exchangers in the direction opposite to the movement of the combustion products t

The disadvantage of such a device lies in the instability of the temperature of hot blowing and the insufficiently high level of its heating.

The purpose of the invention is to stabilize and increase the temperature of a hot blow.

2

This goal is achieved by using heat exchangers of countercurrent and flow type in the device containing successively connected in the direction of motion to blow heat exchangers, while the cold pipe blower is connected to the countercurrent heat exchanger, and the direct heat exchanger is connected to something hot to blow. The chamber of the nozzle of the direct-flow heat exchanger can be provided on both sides with pipelines connected to the nozzle.

5 counterflow heat exchanger from the hot side-. Both heat exchangers can be equipped with autonomous gas burners.

The drawing schematically depicts the proposed device.

The device contains a counter-flow heat exchanger 1 with a chamber of the nozzle 2 and a continuous heat exchanger 3 with a chamber of the nozzle 4. Chamber of the nozzle

five

The 4pr of the coil heat exchanger 3 is provided with pipes 5 and 7 connecting it on both sides with the chamber, and the cage 2 of the countercurrent heat exchanger 1 on the hot side. Pipeline

Claims (1)

5 is equipped with a check valve 6, the pipeline 7 is equipped with a report valve: 8. Pipeline 9 1.flow blow through valve 10 is connected to countercurrent heat exchanger 1, direct heat exchanger 3 is connected to pipe 11 to blow hot through valve 12. Counterflow heat exchanger 1 is equipped with a gas burner 13 and a smoke valve 14 connected with a flue gas 15. The continuous heat exchanger 3 is equipped with a gas burner 16. The device operates as follows. During the gas period, valves 8 and 14 are open, gas burners 13 and 16 are turned on, valves 6, 10 and 12 are closed. Combustion products from the burner 16 with a temperature of 1500 s pass through the nozzle chamber 4 and heat the exchanger 3, where it is cooled to. 1350 ° C, and the pipeline 7 enters the chamber of the nozzle 2 of the countercurrent heat exchanger 1, where it is mixed with the combustion products from the gas burner 13. The temperature of the mixture of combustion products in front of the nozzle chamber 2 is equal. The nozzles 2 leaving the chamber with a temperature of 300,500 ° C through the smoke valve 14 are discharged into the smoke hole 15. During the blow period, valves 8 and 14 are closed, gas burners 13 and 16 are off, valves 6/10 and 12 are open. A cold blast with a temperature of 70-150 ° C from line 9 through valve 10 enters the chamber of nozzle 2 of countercurrent heat exchanger 1, where it is heated to 1450 ° C. During the blow period, the temperature of the hot blow at the exit from the countercurrent heat exchanger decreases continuously and reaches 1250 ° C at the end of the period. From the countercurrent heat exchanger 1, the blower with variable temperature through the pipeline 5 enters the nozzles 4 - the linear heat exchanger 3. After the gas period, the nozzle 4 chamber at the inlet has a temperature of 1450s, and the output is 1350 ° C. 1450 ° C, in the chamber of the nozzle 4 of the continuous heat exchanger, it is cooled to 1400 Siv VO same vgem equalizes the temperature of the chamber of the nozzle 4 along its length. As the cooling in the chamber of the nozzle 4 is cooled, the heat transfer from blowing to the nozzle slows down and in the second half of the blowing period, the return of temla from the nozzle chamber 4 to the blow begins. At the end of the blowing period, the temperature of the chamber of the nozzle 4 at the inlet is 1350С, and at the outlet is 1410 ° С. The temperature of the blowing during the blowing period at the entrance to the chamber of the nozzle 4 decreases with, and at the output it is maintained at a level with fluctuations of no more than ±. A heated blast with a stable temperature through conduit 11 is supplied with a hot blast to a blast furnace (not shown). Other options are possible for the structure and use of the proposed device. For example, both heat exchangers may have a common combustion chamber; only one of the heat exchangers can be equipped with a combustion chamber and a burner; nozzles can be both vertical and horizontal, etc. The use of the proposed device increases the temperature of blowing at 100-150С and its stabilization, which leads to a decrease in coke furnace consumption by 3-4% and, as calculations show, to reduce the cost of smelting iron by 0.5-0.7 p / t. Claims An apparatus for heating a blast furnace blast containing sequentially connected pipelines in the direction of motion blow regenerative heat exchangers with chambers filled with refractory nozzles, the burner and the pipeline are blown into the first heat exchanger, characterized in that, in order to increase and stabilize the temperature, blow The second heat exchanger is made with a straight-through chamber, is equipped with a burner and is connected by a pipeline of combustion products with the first heat meter. Sources of information taken into account during the examination 1. Patent of Germany No. 2236869, cl. from 21 to 9/04, 1974, / zhzhiyu M y 1. V / g