JPS5818006Y2 - Furnace uniform heating device - Google Patents

Description

[Detailed description of the invention] This invention relates to an improvement of a heating device, so-called burner, for heating and maintaining a uniform temperature inside an annealing furnace or a heating furnace.

In burners used in conventional combustion furnaces and heating furnaces,
Even if you want to install it as close to the hearth surface as possible, the combustion gas outlet 3 of the burner aisle 2a as shown in FIGS.
Since the shape of a is circular, the installation height becomes high and the flame becomes large, causing a tendency for floating.

Therefore, the height of the pedestal for the heated object had to be made considerably high, and the heated object itself had to be placed far away from the burner to avoid direct flame from the burner.

However, in the conventional type, the effective dimension inside the furnace is narrowed,
Not only is it difficult to load objects to be heated due to the height of the pedestal, but it also poses a safety risk depending on the shape of the objects to be heated.

Note that 10a in the figure is a sight hole.

The present invention is intended to overcome the above-mentioned problems, and the shape of the combustion gas outlet of the burner tile is oval, and several air holes are provided at the upper part of the combustion gas outlet with an angle of downward inclination. The purpose of the present invention is to provide a heating device which is improved by being equipped with a high-speed jet nozzle.

An embodiment of this invention will be described with reference to the drawings.

1 is a fixed frame that is screwed onto the furnace body; 2 is a burner tile that is installed through the fixed frame 1; the combustion gas outlet 3 of the burner tile 2 is formed in an oblong shape that is long in the horizontal direction; The combustion gas outlet 3 of the burner tile 2 is fixed frame 1
When attached to the furnace body, it is placed as close as possible to the hearth.

4 is a combustion mixed gas feed pipe connected to the inlet side of the burner tile 2, and 5 is a pilot burner connected to the middle of the burner tile 2.

Reference numeral 6 designates several high-speed jet nozzles that are positioned above the combustion gas outlet 3 and installed through the fixed frame 1;
. . . 6 are arranged so that the ejection direction thereof is inclined downward and the ejected air is converged in the extension direction of the center line of the combustion gas outlet 3 when viewed in a plane.

7 is an air pipe directly connected to the high speed jet nozzle 6.

In the above configuration, while the pilot burner 5 is ignited and the combustion mixture gas is sent to the burner tile 2 via the feed pipe 4, the high speed jet nozzle 6...6 is sent via the air pipe 7. When air for stirring the furnace air is ejected so as to converge with the combustion gas flame, an extremely effective combustion state is created in the furnace, and the temperature inside the furnace is maintained uniformly as shown in the measurement results in Figures 3 to 5. You can.

Note that in Figures 3 to 5, the X axis represents the depth inside the furnace (
The unit of numbers is mm), the Y axis is the width inside the furnace (the unit of numbers is mm), the Z axis is the height inside the furnace (the unit of numbers is mm), and each change curve is the isotemperature distribution (' C), and the combustion conditions in this measurement are (combustion air pressure) P235
mmH,,0, (furnace air stirring air pressure) Pexc=49
5 mmH, 0, (furnace temperature) t = 740°C.

As mentioned above, the heating device according to the present invention has the combustion gas outlet 3 of the burner tile 2 placed as close as possible to the hearth,
In addition, a plurality of high-speed jet nozzles 6 are arranged in a portion other than the lower part of the combustion gas outlet 3, and the jet direction of the high-speed jet nozzles 6 is inclined downward, so that the effective size inside the furnace is expanded. This has a remarkable effect on the economic efficiency and workability of the furnace.

In addition, since the heating device according to the present invention is configured such that the combustion gas outlet 3 is formed into an oblong shape that is elongated in the horizontal direction, the burner installation height can be lowered and the combustibility is improved. In addition to enlarging the effective dimensions of the furnace, it is possible to heat the furnace uniformly, and since the flame is short and spread flat, temperature compensation between burners is improved.

Furthermore, the heating device according to the present invention tilts the ejection direction of the high-speed ejection nozzle 6 downward, and when viewed from above, the ejection direction of the high-speed ejection nozzle 6 is directed in the direction of extension of the center line passing through the combustion gas outlet 3. Since the head is opened to accommodate the combustion gas, the combustion gas mixes well and is pressed downward, making it possible to make the pedestal for heated objects much lower than before, expanding the effective dimensions of the furnace, and increasing the height of the furnace. This is more useful for uniform heating.

Furthermore, by using a system in which the ejected air is drawn directly from the air pipe, the equipment cost is reduced and the structure is simplified.

Note that this device can be applied not only to gas fuel but also to oil fuel.

[Brief explanation of drawings]

The drawings show an embodiment of the uniform heating device for a furnace according to this invention. Fig. 1 is a front view, Fig. 2 is a sectional view taken along line A-A in Fig. 1, and Fig. 3 shows the temperature distribution inside the furnace. FIG. 4 is a temperature distribution diagram in the BB section of FIG. 3, and FIG. 5 is a temperature distribution diagram in the CC section of FIG. 3. Fig. 6 is a front view showing the conventional example, and Fig. 7 is D-D in Fig. 6.
FIG. 2... Burner tile, 3... Combustion gas outlet, 6... High speed jet nozzle.

Claims (1)

[Scope of utility model registration request] The combustion gas outlet of the burner tile is formed into a long oblong shape in the horizontal direction, and is placed as close to the hearth as possible, and multiple high-speed jet nozzles are arranged in the part except the lower part of the combustion gas outlet. At the same time, the ejection direction of the high-speed ejection nozzle is inclined downward, and the ejection direction of the high-speed ejection nozzle is opened so as to converge in the direction of extension of the center line passing through the combustion gas outlet when viewed from above. A unique furnace heating device.