SU926017A1 - Blast furnace air heater - Google Patents

Description

(54) AIR HEATER FOR DOMAIN FURNACES

I

The invention relates to metallurgy and can be used, in particular, to heat a blow fed to blast furnaces.

Known hot-air heaters are known, which are provided both with internal and external combustion chambers 1.

The former have a number of disadvantages associated with the low resistance of the combustion chamber, the latter have large dimensions, high cost, complex configuration and require large capital expenditures.

In this connection, it is necessary to get rid of the combustion chamber and to burn gas directly in the domed space of the air heater or in special gas chambers located near it.

The closest to the present invention is an air heater, containing a casing and lining of the dome and nozzle chamber, an annular prechamber, a multi-nozzle burner, a gas air stake, j lecturers with outlets, into the gas and air supply channels to the nozzles. burners located between the dome casing and the landing chamber, in which the air and gas channels located in a chessboard pattern are closed at the top and have openings in the walls, communicating with the mixing chambers between them that are open at the top 2.

The drawback of the device is the thermal power of the july device, which is high in the body, and its high hydraulic resistance.

The purpose of the invention is to increase the thermal power of the air heater.

Claims (2)

This goal is achieved by the fact that in the air heater containing the casing and lining of the dome and nozzle chamber, an annular prechamber, a multi-nozzle ring burner, a gas and air inlet manifold with outlet openings in the gas and air supply channel to the burner located between the dome casing and the nozzle chamber The channels of the supply of gas and air to the burner are made alternating with each other, the air is closed at the top and have holes in the side walls and the through gas channels are open in the form and equipped with a cop lnikami. The implementation of a multi-burner in the form of alternating channels, of which one, for example air, are blocked I from above and have holes in the side walls of the other, for example gas, have a free exit forformer, allows for good mixing of gas and air due to the cross-introduction of one stream into another, to get a short flame, to reduce the hydraulic resistance on the gas side by increasing the active cross section of both the gas ducting channels and the mixing chambers (which are either air, or gas channels), and ultimately increase the heat output of the burner and air heater. A drop on a burner of possible chipping of the dome and for-chamber masonry does not impair its operability, since the gas (air) channels have diggers in their lower part, and the air (gas) channels are closed at the top and have holes in the vertical side walls. Fig, 1 shows the proposed heater; in fig. 2 - a burner, a cut along the perimeter, in FIG. 3 - a burner, section 1 According to the channels in the plan. The heater has gas inlet 1 and air inlet 2 to gas 3 and air 4 manifolds. The lining of the dome 5 rests on the top. Overlap 6 collectors. The inner shell 7 is connected to the casing 8 in its lower part. The burner consists of alternating channels 9 with overlaps 1O and channels 11 without overlaps. On the side walls of the channels with overlaps, there are openings 12 for the exit of the gaseous medium, and the channels themselves are connected to one of the collectors, for example, with air, through the openings 13. The channels without overlaps are connected to another collector, for example gas, through openings 14 which are located on the side wall of the collector. The lower part of the channels 11 serves as a digger for the masonry inclined from the dome. The shut-offs 1O simultaneously serve as ignition stabilizers and ensure reliable ignition of the gas at the exit of the burner. Above the burners, there is a prechamber 15, extending into the domed space 16. In the dome there is a nozzle 17 hot blowing, located above the nozzle chamber 18. The inner shell 7 is insulated from the nozzle chamber with a lining 19, which protects it from heating from the nozzle side, from channels inner shell separated masonry 2O. When the air heater is in operation, during heating the gas and air through the pipes 1 and 2 are supplied to the gas 3 and air 4 collectors and through the holes 13 and 14 are distributed through the channels 9 and 11. Air through the holes 12 into the side walls of the channels penetrates into the gas flows flowing parallel in channels 11. A combustible mixture is formed, which ignites on the overlap stabilizers 1O and burns in the prechamber 15. The combustion products enter the dome space 16, and from there they are directed into the air-heating chamber 18 and located in her nozzle. During the period the cold air is blown through the nozzle from below, its passage is heated and discharged through the nozzle 17 to blow hot. The implementation of the proposed device will allow to increase the heat capacity of the air heater by 2%, Economic efficiency from operation. such a shaftless air heater will be 225 thousand rubles. in year. An air heater for blast furnaces comprising a casing, a dome, a lining, a nozzle chamber, an annular prechamber, a multi-coil annular burner, a gas inlet and an air collector with outlet openings in the gas and air supply channels to the burner located between the dome casing and the nozzle, which are located between the dome casing and the nozzle, located between the dome casing and the nozzle, located between the dome casing and the nozzle, located between the dome casing and the nozzle, located between the dome casing and the nozzle, located between the dome cover and the nozzle, located between the dome casing and the nozzle by the fact that, in order to increase the heat output of the air heater, the channels for the supply of gas and air to the burner are made alternating with each other, and the air ends are blocked 5 9260176 above and have holes in the side1. Wegman E.F.Zherebnn B.I., Pokstenkah, and through gas channels from I.V. Yevnev I. Yu. S. Yu. S. Metallurved into the prechamber n are provided with piggy-iron. M., Metallurgists, 1978, nicknames. ,with. 451-453. Sources of information, s 2. USSR author's certificate taken into account in the examination of 6O2355, cl. C 21 B 9 / O2, 1978.