SU912760A1 - Blast furnace air heater - Google Patents

Description

The invention relates to ferrous metallurgy, in particular, to the designs of air-heating and e-furnaces.

The closest to the proposed by the technical essence and the achieved positive effect is the air heater of the blast furnace containing the chamber, the combustion chamber, the common dome, the hot choke fitting, the hot blow path, the heat exchanger and at the same time the heat exchanger with the heater is installed hot blast nozzle. The regenerator is additionally equipped with gas burners llj.

A disadvantage of the known air heater is the low heating efficiency of blowing when the air heater is operating on low-calorie gas, and is difficult to operate and maintain.

The purpose of the invention is to increase the heating efficiency of the use of low-calorific gases.

The goal is achieved by the fact that the air heater of the blast furnace containing the nozzle chamber, the combustion chamber, the common dome, the hot air nozzle, the hot path, the heat exchanger and the additional combustion air supply is equipped with a coaxial nozzle installed in the bottom of the combustion chamber, at that, the nozzle is connected to a heat exchanger, made in the form of an additional nozzle, mounted on a sub-nozzle device, connected to a hot-blowing path, into which an additional supply of combustion air is embedded.

The air duct connecting the path and the choke is hot, and the clamp is set.

The drawing shows a blast furnace stove, vertical section. . The blast furnace air heater consists of a dome 1 connected to the nozzle chamber 2 and the combustion chamber 3. In the combustion chamber 3 a nozzle outlet k is installed for hot blowing, below which a gas burner 5) is fitted with a supply of low-caloric gas from collector 7 and a supply of cold 8 air from the fan 9. A coaxial hot air heat exchanger nozzle is inserted below the gas burner 5 with an additional nozzle 10 mounted on the sub nozzle 11. The one nozzle 11 is connected by a duct 12 with a path 1 3 hot air blows, the pipeline 12 / between the regulator And and the sub-nozzle 11 is equipped with a cold air supply pipe 8, and a shut-off gate 15 is installed on the cold air nozzle 8, and a pin 13 is mounted on the cold end and the gate gate is installed 17 is connected to the fitting 4 of the hot-blown outlet in the combustion chamber of the 3D for regulating the combustion of gas in the burner $ on the gas inlet 6 a regulator 18. On the supply of 8 cold air from the fan 9 The regulator 19 is installed, and on the connecting pipe e supply controller 8 is set 20Gazova burner 5 is formed as a circular pipeline 21 connected to sleeve 22 with channels 23, mounted beneath the ring. air duct 2 connected by sleeves 25 to ducts 26, which in turn are installed above coaxial nozzle 217 of hot air heat exchanger.

Air blast furnace works as follows.

During the heating period of the main runoff, the cold air from the fan 9, the cut supply 8 is fed to the sub-nozzle 11 of the nozzle 10, leaving through which it heats up, extracting heat accumulated earlier (blowing during the heating), mixing with the mixture of air and gas in the burner 5 coming from channels 23 and 26 from annular gas pipelines 21 and 2 through hoses

22 and 25.

Thus, the air has a constant temperature for a total of 912

his nose blown in extra

Claims (2)

the heat exchanger nozzle 10 is blowing hot. During the heating period, cold air is blown from the fan 9 and the blast furnace gas from the collector 7 is not supplied. Operation of the nozzle 10 under high pressure (2-6 MPa) during the period of its heating by the blast allows for a short period of time to warm up its thickness, so that during the heating period of the main nozzle 2 it is possible for a long time to give off heat to the fan air, thereby maintaining the air temperature burning within the required limits. 4 cycles equal to 700–770 ° C ensure combustion at a calorific value of blast furnace gas of 850–900 kcal / nm, the temperature under the dome 1 of the air heater is 1500–1550 ° C, which corresponds to a blowing temperature of 1400-Н50 ° С. During the entire period of heating of the main nozzle, the amount of ventilation air is constantly redistributed in the direction of increasing the flow through the nozzle 10 (as it cools) and reducing the proportion of air passing through the burner 58, the heating period blowing the blast heated in the nozzle 2 through the nozzle The k output of the hot blow in the chamber of the mount 3 by the pipe 12 with the open shut-off gate 17 is directed to the hot blow 13 while the clamping 16 of the pipeline has a resistance greater than the resistance of the lead screw (10) -30%. The amount of blowing through the additional nozzle 10 mounted on the sub-nozzle 11 is controlled by the AND regulator installed on the pipeline 12. Thus, the hot blast to the 3-way hot blow is supplied by two streams: the outlet nozzle. which blows and pinches 16, another flow through a coaxial nozzle 27, nozzle 10, pre-load 11, with the shut-off gate 15 closed and the shut-off gate 28 open before adjusting the T (which allows operation without a specially installed mixer) gets through the air pipe 13 to blow hot. "This allows the nozzle 2 to accumulate additional amount of heat required for the proposed perePrimenenie stoves allow the use of low-calorie gas for heating blow, blow rate increase eraturu an overall increase heating efficiency blowing. An invention f. A blast furnace air heater comprising a nozzle chamber, a combustion chamber, a common dome, a hot choke, a hot blow path, a heat exchanger and an additional air supply. burning, in order to increase heating efficiency. Blow when using low-calorie pelvis, the air heater is equipped with a coaxial nozzle installed in the bottom of the combustion chamber, while the nozzle is connected to a heat exchanger mounted as an additional nozzle mounted on the sub-nozzle connected to a hot blowing path into which an additional supply of combustion air is embedded. 2. The air heater according to claim 1, which is characterized by the fact that the clamp is installed on the air duct connecting the truck and the hot-air choke. Sources of information taken into account during the examination 1. French patent number 15b6 7b, cl. C 21 V, pub. 19b9.