JPS6113548Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is based on the idea that metal pieces such as slabs are
This relates to a heating furnace that is heated by charging in rows, and in particular, the lower side burner is provided with an irradiation tube.

In a conventional metal heating furnace, as shown in FIGS. 1 and 2, for example, slabs b loaded in two rows in the width direction of the furnace into a slab support c provided in a heating furnace a are connected to a partition wall j. It is heated to 900 to 1200°C while moving through the pre-heating zone d, heating zone e, and soaking zone f divided by arrows i as shown by arrows i. The heating zone e and the soaking zone f have a ceiling burner h, but the preheating zone d has no burner, and as shown by the arrow k, the heating zone e is heated by high-temperature gas of 800 to 1000°C flowing from the heating zone e. Preheat slab b.

By the way, since the lower side burner h is a direct flame type, the flame rises and locally heats the slab b, especially when the burner is turned down. As shown in FIG. Further, in normal operation, the center of the furnace width becomes high temperature under the influence of the exhaust gas from the lower side burner on the opposite side, and the temperature distribution of the slab b becomes uneven. In this way, in a conventional heating furnace,
It has been extremely difficult to control the lower side burner to make the temperature distribution of the heated material, such as the slab, uniform.

An object of the present invention is to provide a heating furnace in which the temperature distribution of a heated material such as a slab can be made uniform and can be easily controlled by improving the lower side burner.

Therefore, the configuration of the present invention is such that in a heating furnace in which two rows of materials to be heated are charged in the width direction of the furnace, a lower side burner has a curved tip having a combustion gas outlet on the side of the burner from the center of the width of the furnace. It is characterized by being equipped with an radiation tube.

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 3 to 6.

3 and 4 show a first embodiment of the present invention, FIG. 5 shows a comparison of furnace width temperature distribution, and FIG. 6 shows a second embodiment of the present invention.

In FIG. 3, 1 is a furnace wall, 2 is a slab as a material to be heated, 3 is a slab support, 4 is a ceiling burner, 5 is a lower side burner, and 6 is a furnace width center line. Reference numeral 7 denotes an radiation tube installed in the lower side burner 5, and its combustion gas discharge port 8 is aligned with the furnace width center line 6.
It is closer to the burner side. That is, as shown in FIG. 4, the lower side burner 5 of the heating furnace 1 has a curved tip with an open opening as the combustion gas exhaust port 8, located half way toward the burner side from the furnace width center line 6.
A J-shaped radiation tube 7 is provided.

In the heating furnace configured as shown in FIGS. 3 and 4, the lower side burner 5 is provided with the radiation tube 7.
The flame from the slab 2 is guided by the radiation tube 7, and even if the combustion amount changes significantly from 100% to 5% or less, the flame does not rise and local heating of the slab 2 does not occur. Moreover, since the flame is located inside the radiation tube 7, the gas radiation becomes solid radiation, improving the heating capacity and stabilizing the heating source.
temperature distribution is improved. In addition, since the combustion gas outlet 8 from the radiation tube 7 is located closer to the burner than the furnace width center line 6, the two rows of slabs 2 are not affected by the exhaust gas from the burner on the opposite side, as shown in FIG. In addition, the furnace width temperature distribution is improved. That is, the fifth
In the figure, the dotted line curve 9 shows the furnace width temperature distribution of the conventional heating furnace, and the solid line curve 10 shows the width temperature distribution of the conventional heating furnace.
This figure shows the furnace width temperature distribution of the heating furnace shown in the figure, and the curve 10 is close to a horizontal straight line, which means that it is almost uniform in the furnace width direction. Furthermore, since the exhaust gas is discharged under the slab 2, the temperature of the slab 2 increases quickly, and since the exhaust gas acts only on one side of the slab, the furnace temperature is not disturbed and controllability is improved. do.

FIG. 6 is shown in correspondence with FIG. 4. In the example shown in FIG. The effect is the same.

As described above, the present invention provides a heating furnace in which materials to be heated are charged in two rows in the width direction of the furnace, and a lower side burner has a curved-shaped radiation outlet having a combustion gas outlet on the side of the burner from the center of the width of the furnace. is provided, so
As mentioned in the above example, even if the combustion amount changes significantly, there is no flame rise, local heating of the heated material does not occur, and the gas radiation becomes solid radiation, improving heating capacity and heating. In addition, since it is not affected by the exhaust gas from the burner on the opposite side, it improves the temperature distribution across the furnace width, enables uniform heating of the material to be heated, and also allows for temperature control. It becomes easier.

[Brief explanation of the drawing]

Fig. 1 is a sectional side view showing a conventional heating furnace, Fig. 2 is a sectional front view of Fig. 1, Fig. 3 is a sectional front view showing a first embodiment of the present invention, and Fig. 4 is a sectional front view showing a conventional heating furnace. FIG. 3 is a cross-sectional plan view mainly showing the radiation tube, FIG. 5 is an explanatory view showing the furnace width temperature distribution, and FIG. 6 is a cross-sectional plan view showing a second embodiment of the present invention. 1...Furnace wall, 2...Slab, 3...Slab support, 4...Ceiling burner, 5...Lower side burner, 6...Furnace width center line, 7...Emission tube, 8...
Combustion gas outlet.

Claims (1)

[Scope of utility model registration request] In a heating furnace in which materials to be heated are charged in two rows in the width direction of the furnace, the lower side burner is provided with a curved radiation tube having a combustion gas outlet on the side of the burner from the center of the width of the furnace. A special feature is the radiation tube heating furnace.