JPS5914717Y2 - Surface ignition device for sintered raw material layer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a surface ignition device for a sintered raw material layer, and more particularly, to a surface ignition device that can uniformly ignite the surface of a sintered raw material layer.

The surface of the raw material layer is prepared by an ignition furnace 2 having a large number of burners 1 attached to the ceiling as shown in FIGS. 1 and 2.

In this ignition furnace 2, the surface of the sintered raw material layer 3, especially the
Coke is lit.

Further, burners are usually installed in two or three zones on the ceiling of the ignition furnace 2, and ignition is performed using these.

However, in the case of an ignition furnace in which a burner is installed only in a single zone, significant temperature unevenness occurs on the surface of the sintered raw material layer in the area immediately below the burner and in other areas.

In addition, burners are installed in one zone from several to around 20 in an attempt to reduce variations in surface temperature, but in reality, temperature irregularities still occur.

The present invention aims to solve the above-mentioned drawbacks, and specifically proposes a surface ignition device that can ignite the surface of the sintered raw material layer evenly and most efficiently.

That is, the present invention includes a pair of plate-shaped materials arranged before and after a group of burners arranged in the width direction of the sintered raw material layer, and a slit-shaped combustion chamber formed between these plate-shaped materials. Features.

Embodiments of the present invention will be described below with reference to the drawings.

In addition, FIG. 3 is a perspective view of an ignition device according to one embodiment of the present invention, and FIGS. 4 and 5 are explanatory views showing a mode of use thereof in cross section.

First, in FIGS. 3, 4, and 5, reference numeral 1 indicates a burner, 2 indicates an ignition furnace, and 3 indicates a sintered raw material layer. are attached in a row in the width direction of the sintering raw material layer 3.

Each of these burners 1 has a pair of plate-like materials 4 made of refractory or heat-resistant steel, etc., located in front and behind the surface of the sintered raw material layer 3.
, 5 are provided, and a slit-shaped combustion chamber 6 is formed between these plate members 4.5.

With this configuration, the combustion flame from each burner 1 can be applied directly and uniformly to the surface of the sintering raw material.

In addition, the tips of the inner walls of the pair of plate materials 4 and 5 are arranged at a distance from the surface of the sintered raw material layer to improve the ignitability of the sintered raw material layer and to increase the red-hot burner tile area. preferable.

As described above, by surrounding the front and rear of the burner group with plate-like materials to form a slit-shaped combustion chamber, the surface can be uniformly and effectively ignited.

Conventionally, ignition of the sintered raw material layer was carried out by heating the inner wall of the ignition furnace to a high temperature using burners installed in one to several zones in a combustion chamber called an ignition furnace, and placing the burner flame on the surface of the sintered raw material layer to separate the coke. This is done by preheating and igniting.

Further, after the coke in the sintering raw material is ignited on the surface, air is sucked by the negative pressure at the bottom of the sintering raw material layer, and this air causes combustion to proceed from the upper surface to the lower surface.

In other words, the essential role of the ignition furnace is to ignite the coke on the surface of the sintered raw material layer.

However, in this ignition, it is not necessary to separate the burner or the combustion gas from the surface of the sintered raw material layer as in the conventional example, but instead, as in the present invention, the combustion flame is directly applied to the surface of the sintered raw material layer as effectively as possible. It can be ignited effectively depending on the situation.

In particular, when the thickness of the sintered raw material layer is high and the pallet speed is slow, the ignition effect of the present invention is improved.

Furthermore, a problem with conventional ignition furnaces is the non-uniformity of the ignition situation on the surface.

For example, FIG. 6a is an explanatory diagram of the arrangement of burners 1 in a conventional ignition furnace when viewed from the ceiling. In this case, there are, for example, 16 burners 1 in the L zone and 15 burners in the 2 zone They are arranged in a staggered arrangement in the direction of sintering progress.

The changes in the surface temperature of the sintered raw material at this time are as shown in Figures 6 and 6 in Zone 1 and Zone 2, respectively, and the surface temperature differs by about 300°C between directly below the burner and elsewhere. The coke is not ignited anywhere other than directly below the burner.

On the other hand, as shown in FIG. 7a, when the surface ignition device according to the present invention is used, the burner 1 is installed in only one zone, but the surface of the sintered raw material layer is Since the light is ignited uniformly, the surface temperature becomes uniform across the width.

In summary, the surface ignition device according to the present invention includes a pair of plate-shaped members installed before and after a burner arranged across the width direction of a sintered raw material layer, and a slit-shaped combustion chamber provided between these plate-shaped members. The combustion flame directly hits the surface of the sintering raw material layer and is ignited.

Further, since the combustion air is guided to the slit-shaped combustion chamber and the fuel is diffused and burned there, it can be ignited or heated evenly and effectively.

[Brief explanation of the drawing]

1 and 2 are a sectional view and a plan view of a conventional ignition furnace, FIG. 3 is a perspective view of an ignition device according to an embodiment of the present invention, and FIGS. 4 and 5 are views of its use. FIG. 6A is an explanatory diagram showing the state in cross-section. FIG. 6A is an explanatory diagram of the burner arrangement of a conventional ignition furnace. FIGS. The graphs shown in FIGS. 7a and 7b are explanatory views of the burner arrangement of the surface ignition device according to the present invention and graphs showing the surface temperature transition on the bar 8 line. Code 1... Burner, 2... Ignition furnace, 3... Sintering raw material layer, 4... Plate material,
5... Plate material, 6... Combustion chamber.

Claims (1)

[Scope of utility model registration request] A sintered raw material characterized in that a pair of plate-shaped materials are arranged before and after a group of burners arranged in the width direction of a sintered raw material layer, and a slit-shaped combustion chamber is formed between these plate-shaped materials. Layer surface igniter.