SU1232696A1 - Soaking pit - Google Patents

Description

The invention relates to recuperative heating wells with separation from the center of the hearth and can be used in metallurgy to heat the ingot before rolling on a pressing mill.

The aim of the invention is to increase productivity and reduce fuel consumption.

FIG. 1 shows schematically a heating well, a transverse section; in fig. 2 — node 1 in FIG. one; FIG. 3 is a section A-A in FIG. 2.

The heating well contains a burner device in the form of a central air supplying lined channel 1 and a gripping fuel supply manifold 2 with tangential nozzles 3, an additional collector 4 for supplying energy carrier with tangentially mounted nozzles 5. In the upper part of its lined air supporting part is the working space of the heating well, and in the lower part is connected by channels 6 with air recuperators.

The fuel supply and air supply collectors are provided with a fuel supply 7 and a supply of additional air 8. Tangential nozzles 3 with nozzles 5 placed in their inner cavity are directed into the lined air duct at an angle of 45 in the direction of its outlet orifice, and their axes in plan are tangential to the inner surface of the fuel inlet 7 and the ratio of nozzle diameters 5 to tangential diameters nozzles 3 are 0.4-0.6. Inlet 7 is connected by distribution channels 9, which in the upper part are connected to the fuel intake manifold. The tangential-mounted nozzles .3 and 4 have convergers 10. The distance from the tip of the nozzle 5 to the section of the tangential nozzle 3 along the axis is t-1.3 of the diameter of the nozzle 5.

The heating well works as follows.

Through the lined air passage, air from the heat exchangers is fed into the working space of the heating well. Through the nozzles 5 an additional energy source is supplied, for example, under a pressure of 800-1200 mm of water column, which leads to movement and acceleration of mixing, and through tangential nozzles

3 is supplied at a pressure of 300,500 mm of water. Art. fuel in the form of flammable gases. During the outflow, a peripheral fuel stream is ejected through the holes.

central air flow. Air-gas jets flowing out through the burned; full-blown holes have high kinetic energy and result in intensive rotation of the central

air flow ascending upward along the lined air passage, which is ensured by the installation of .tangential nozzles 3 and 5. The ratio of the nozzle diameters 5 to

the diameters of the tangential nozzles 3 of 0.4-0.6 allows the use of fuel gas and additional air with the lowest pressure. Placing the end face of the nozzle 5 at a distance of 1-1.3 of its diameter from the slice of the tangential nozzle 3 provides a sufficient degree of displacement entering the cell of the vortex flow during the heating period.

Approaching nozzles 5 at a distance

less than 1 diameter to the output slice of tangential nozzles 3, in particular, with 0.9 nozzle diameters, reduces the quality of combustion of the air-fuel mixture, increases the height of the flare in the cell by 10%, leads to an increase in unorganized circulation vortices in the lower part of the cell working space. Removing the nozzles at a distance greater than the specified upper limit, in particular at 1.4 of the diameter of the nozzle, extinguishes the vortex length in the cell by 8-12%, which leads to an increase in the temperature difference between the bottom part of the ingot and its top, in addition, increases the guide; Equal resistance in the air duct is up to 4%, which leads to a decrease in thermal power per cell.

Thus, the use of the invention intensifies the heat fission in the lower part of the chamber due to the formation in this region of an active vortex flow with products of complete combustion during all periods of heat treatment of the ingots.

Fig.Z

Editor N. Gunko

Compiled by G. Nazarov

Tehred M. Khodanych Proofreader E. Roshko

Order 2739/28 Circulation 552 Subscription

VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, Projecto st., 4

Claims (1)

A HEATING WELL containing a working chamber, a burner device located in the center of the hearth and made in the form of a central air supply lined channel and a fuel supply manifold encircling it with tangentially mounted nozzles, and a recuperator, characterized in that, in order to increase productivity and reduce fuel consumption, the well equipped with an additional manifold with nozzles for supplying energy, clasping the fuel supply manifold, while the nozzle additional collector pa usta- <g Credited inside nozzles toplivopodvodyaschego collector and coaxially to them, the diameter ratio of 0.4-0.6 nozzles and the distance between the outlet ends of the nozzles of the nozzle manifold additional 1-1.3 diameter.