SU1435912A1 - Continuous furnace - Google Patents

Abstract

The invention relates to devices for heating a metal before pressure treatment and can be used in the metallurgical and other industries. The goal is to reduce fuel consumption. The methodical furnace contains lower and upper methodical and welding chambers and a tilting chamber, gliding pipes, burners, a smoke outlet channel and longitudinal partitions in the lower methodological chamber. In the lower welding chamber of the furnace, two additional longitudinal partitions are installed to the level of glazing tubes, which form channels with the side walls of the furnace, the passage area of which is 0.6–0.7 to the meldue section by longitudinal partitions in the methodical lower chamber, and from the side of the burners made converging at an angle on the longitudinal axis of the furnace. The installation of longitudinal partitions in the lower welding zone ensures a reduction in fuel consumption by 15-20%. 2 ill., 1 tab. V)

Description

The invention relates to devices for heating a metal before pressure treatment and can be used in the metallurgical and other industries.

The purpose of the invention is to reduce fuel consumption.

FIG. Figure 1 shows the oven, general view; in fig. 2, section A-A in FIG. one.

The furnace contains chambers: tomilny 1, welding upper 2 and lower 3, methodical upper 4 and lower 5, separated by slip-tubes 6, burners 7, smoke outlet pchny channel 8: arches 9, on which below channel 9 with continuation in methodical chamber 5 are installed longitudinal partitions 10, longitudinal partitions 11 in the lower welding chamber 3, descent of 1Ciies on the longitudinal axis of the furnace at a distance of 10 .., 25 calibers of the burner from the right lower end wall and forming a resistance 12 wedge-shaped in the path of the gas-air mixture forms. Ras; The position between the partition 11 and the side wall 1 of the lower welding chamber 3 I is selected and, under the condition that the first I cross-section between them is 0.6 ... i 0.7 the cross-section between the longitudinal I partitions in the methodical I camera. This makes it possible to preserve the equality of the speeds of movement of combustion products along the entire length of the lower chambers of the furnace. The same condition is subject to the 1. selection of the prostate between the longitudinal: partitions in the methodical 5 and the jpo4HO 3 chambers.

;

When the area of the flow section: - the channels of less than 0.6 area of the flow area between the longitudinal partitions in the methodical chamber, some of the combustion products flow from the lower chambers to the upper ones. This leads to the melting of the ends of the blanks, making it difficult to control the thermal mode of operation of the furnaces overload of combustion products between the chambers. In addition, the uneven distribution of pressure over the furnace height increases, which degrades the quality of fuel combustion, especially when heated by injection burners, and leads to non-production fuel losses due to knocking it out through windows, slots, etc.

0

five

0

five

0

five

0

five

0

five

With values of the passage area of channels greater than 0.7 of the area of passage through the section between the longitudinal partitions in the methodical chamber, the velocity of flow of combustion products decreases and the number of recirculation zones of gases increases, the vacuum in the lower chambers increases. This leads to a decrease in the convective component of heat exchange, the cold air inflow into the furnace increases.

The furnace works in the following way. The air-gas mixture expires from the burners 7 of the lower welding chamber 3 and is directed to the hot surface of the wedge-shaped resistance 12. Rapid heating of the mixture on the surface and the presence of multiple ignition sources on it significantly accelerate the oxidation of the fuel and contribute to the intense heat generation. Wherein

. There is a partial deceleration of the flow of the combustion products formed and a change in the direction of their movement towards the side walls of the furnace. Mixing with the gas-air flow formed by the burners located closer to the side walls of the furnace, they increase its temperature, reduce the speed and direct it to the sides of the furnace. This accelerates the combustion processes of the fuel, which are completed on the surface of the side walls of the lower welding chamber 3 and increase their temperature. At the same time, the gas pressure on the side walls increases, due to the deceleration of the flow, which prevents atmospheric air from leaking in through the leaks in the windows and masonry. Methodical furnaces of the rolling mill 3600 have two lower welding chambers. In the second chamber along the movement of the combustion products, two longitudinal partitions are installed, converging on the furnace axis at an angle of 80 at a distance of 2.5 m from the burner

 walls. In the methodical chamber, two longitudinal partitions are installed, which are consumed towards the side walls of the furnace with the formation of a confuser. With a width of the working space of the furnace 7.8 m,

 the distance between the longitudinal partitions in the methodical chamber is 4 k. With a height of the methodical chamber 1.8 m, the area of the passage section;

none of the longitudinal walls is 7.2 m.

To select the optimal ratio of the areas of the channels formed by the longitudinal walls with the side wall of the welding chamber to the cross-sectional area of the channel between the longitudinal partitions in the methodical chamber, various options for installing the longitudinal walls in the welding chamber are presented, which are presented in the table. m

7 The results were obtained in experiments 11, III, IVJ in the lower zone increased by 20-30 С, the vacuum was reduced by 15-25 Pa. Underburning gas did not superfluous) was given. The specified temperature in the zone was provided at a lower (by 15–20%) fuel consumption.

Ф о р. Invention Methodological furnace, containing lower and upper methodical and welding,

435912 4

. chambers and tomiline, gliding pipes, burners, chimney canal, longitudinal partitions at the bottom of the lower, methodical chamber, diverging to the side walls of the furnace at the beginning of the lower welding chamber and forming a channel and a confuser between themselves, and a vertical smoke outlet channel in the methodical chamber, in order that, in order to reduce fuel consumption, it is equipped with a profile section installed in the lower welding chamber up to the level of sliding pipes, made in the form of longitudinal sections, Channels bubbled furnace walls, the passage sectional area which is equal to 0.6-0.7 seche20 audio channel area between the longitudinal partitions in reheating chamber, the side burners stable longitudinal pe-: regorodki performed converging at an angle to the longitudinal axis and pe25 "

0.5

0.6

0.65

0.7

0.8

3.6

4.32

4.68

5.04

5.76

4.4

3.75

3.4

3.1

2.4

& 9 Yu

fl 12 3

srig.1

2

Claims (1)

SUMMARY OF THE INVENTION A methodical furnace containing lower and upper methodical and welded pipes, burners, a chimney flue, longitudinal partitions on the bottom of the bottom. methodical chambers, diverging to the side walls of the furnace at the beginning of the lower welding chamber and forming a channel and a confuser between themselves, and a vertical smoke exhaust channel, made in the methodical chamber, characterized in that, in order to reduce fuel consumption, it is equipped with a lower the chamber with a profile partition to the level of the glide pipes, made in the form of longitudinal partitions forming channels with side walls of the furnace, the area of the passage section of which is 0.6-0.7 of the channel cross-sectional area between the longitudinal regorodkami in reheating chamber, the burners stable longitudinal side walls formed at an angle converging on the longitudinal axis of the furnace. . Option Area ratio The cross-sectional area of the channels formed by the longitudinal and lateral walls of the welding chamber, m * The distance between the longitudinal and side walls, m The distance between the longitudinal walls, m I 0.5 3.6 1,64 4.4 and 0.6 4.32 1.96 3.75 and ¹ 0.65 4.68 2.13 3.4 IV 0.7 5.04 2,3 3,1 V 0.8 5.76 2.62 2,4 Gssss3