SU1171642A2 - Recirculation furnace - Google Patents

Abstract

RECIRCULATION FOOT by auth. St. No. 358582, characterized in that, in order to improve the economy of the public: m regulation. Vani temperature, the furnace tunnel is equipped with non-combustible gas nozzles, evenly placed on the end wall of the highest section and directed counter to the burner.

Description

I

The invention relates to furnace devices of industrial furnaces and can be applied in metallurgical, machine-building and other industrial sectors.

The purpose of the invention is to increase efficiency by controlling the temperature.

FIG. 1 depicts a recycle: firebox, longitudinal section; in fig. 2 shows section A-A in FIG. one.

The recirculation furnace contains a burner device 1 located at the front end of the furnace tunnel 2, separated by a ceramic wall 3 from the working space 4. The furnace tunnel 2 is connected to the working space by recirculation channels 5 and 6 and the output channel 7. The recirculation channels can be one and more (depending on the relative length of the flue tunnel). In the rear end wall 8 of the furnace tunnel 2, nozzles 9 are installed coaxially with the axis of the burner 1 with the regulator body 10. If the distance .1 from the last recirculation channel to the wall is less than 3.1 V - the width of the last stage of the furnace tunnel, then the number of nozzles 9 in width tunnel 2 n determined by hf

3.1V

with

and the number of rows by the height of the tunnel 2 Pr is determined by the expression

3.1 N

where H is the height of the last step

Furnace tunnel 2. The nozzles 9 are placed in the wall 8 evenly with respect to the cross-sectional area of the last stage of the tunnel. The diameter of the nozzle d opreg is divided from the expression

dr -fV

dc

  9

 R

where dj. - diameter of the burner nozzle;

p - the number of burners in one

firebox.

The furnace works as follows. When the 9 nozzle is turned on, a stream of fresh burning products escapes

71642 .2

from the burner 1. (there may be several) to the furnace tunnel 2, the furnace gases are sucked in (return) through the recirculation channels 5, 5, are mixed with them in the furnace 2, and then the mixture of g-elements is sucked through the recirculation channel 6 furnace gases from the central zone of the working space 4. At the end of the furnace tunnel 2, the mixture of gases (heat carrier) enters the outlet channel 7 and leaves into the working space of the furnace 4.

Heated material intensely

 is heated from the side of the channel 7, and in the direction of the recirculation channels 5 and 6 lags behind in heating. After an experimentally established period of time, a regulating body 10 is fed through a nozzle 9 through a jet of non-combustible gas, for example air. This jet, expanding, overlaps the furnace tunnel 2, alternates; with the combustion products, and the resulting mixture exits through the recirculation channels 5 and 6. The temperature of the combustion products decreases as a result of mixing with a cold non-combustible gas, which reduces the danger

0 overheating of nearby areas of heated material. The resulting mixture, entering the working space 4, heats the material in the zones of the recirculation channels 5 and 6 and quickly

5 levels the surface temperature of the tank in these zones.

Upon reaching a given temperature of the material, the flow rate in the areas directly affected by the flows,

0 heat carrier, regulatory authority 10. partially or completely blocks the flow of non-combustible gas.

It is most expedient to supply 5 through the nozzles 9 air from the same network as the air for burning fuel. In this case, the air pressures in the burner 1 and the nozzle 9 are about the same, and the flow rate through the nozzles 9 is determined by their total space. The maximum flow rate through the nozzles 9 should provide an approximate equality of the amounts of movement of opposing jets: burners 1 and nozzles 9. Increasing the amount of gas movement from nozzles 9 over the amount of gas movement) from burner 1 is undesirable, since in this case almost all of the heat carrier 3111642, 4

Tep enters the working space. For oxidative oxidation through the first heating channel when heating the metal5, insufficiently heated air can be emitted through the central channel 6 of the posts as non-combustible gas. use technical nitrogen.

(puz.Z

Claims (1)

RECIRCULATION HEATER 'by ed. St. No. 358582, characterized in that, in order to increase efficiency by regulating the temperature, the furnace tunnel is equipped with nozzles for supplying non-combustible gas uniformly placed on the end wall of the step of the largest cross section and directed counter to the burner. I