JP2008096042A - Ignition furnace for sintering machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ignition furnace for a sintering machine capable of improving the yield of sintered ore. <P>SOLUTION: In a main ignition furnace 8, a plurality of main burners facing an upper layer of sintering material M carried in by a conveyance means 2 are arranged in an interior at predetermined intervals in a width direction, and in an auxiliary ignition furnace 10, auxiliary burners facing both width direction ends of the upper layer are arranged in an interior. The auxiliary ignition furnace is arranged adjacently in a conveyance downstream direction of the sintering material with respect to the main ignition furnace, and flame of the main burner and flame of the auxiliary burner facing both width direction ends of the upper layer are continuously radiated on both width direction ends of the upper layer. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an ignition furnace that ignites an upper layer of a sintering raw material in a sintering machine for producing sintered ore.

A sintered ore is manufactured with a sintering machine as follows.
First, a sintered raw material obtained by mixing fine ore, auxiliary materials for component adjustment, and carbonaceous materials is charged onto a conveyor (conveying device), and then placed on the upper layer of the sintered raw material in an ignition furnace disposed upstream of the conveyor. Ignite to form a combustion zone. And while advancing the conveyor at a constant speed, air is sucked from the upper layer to the lower layer of the sintered raw material on the conveyor by the blower, so that the combustion zone of the sintered raw material is expanded downward. Thereby, a sintering raw material is baked with the heat which generate | occur | produced by combustion, and a sintered ore is manufactured.

  As an ignition furnace of a conventional sintering machine, in order to improve the yield of sintered ore, in an ignition furnace in which a plurality of burners are arranged in the width direction in the furnace, burners at both ends in the width direction (hereinafter referred to as side burners) ) From the burner at the center in the width direction (hereinafter referred to as the main burner) to the side of the feeder (downstream of the pallet that conveys the sintering raw material) so that the inclination of the inner wall of the pallet (conveyor) An arrangement is known (for example, Patent Document 1).

In the ignition furnace of this sintering machine, a side burner and a main burner are arranged in the same furnace body, and by the flame radiation of these side burners and the main burner, Both ends in the width direction are ignited.
Japanese Patent Publication No.6-1152

By the way, although the wall part has stood up in the width direction edge part of a conveying apparatus, even if it burns at the width direction both ends of the sintering raw material which contact | connects this wall part, it will be easy to take heat to a wall part immediately.
Therefore, when the center part in the width direction and both ends in the width direction of the sintering raw material are ignited in the same time as in Patent Document 1, even if both ends in the width direction of the sintering raw material burn, heat is immediately taken to the wall part. Since it is easy, the yield of the both ends of the width direction of a sintered ore tends to fall. FIG. 5 shows the yield state of the sintered ore when the entire width direction of the sintered raw material is ignited in the same time as in Patent Document 1, but the upper layer at both ends in the width direction of the sintered ore. Yield is as low as 60%.

  The present invention has been made to eliminate such disadvantages, and an object of the present invention is to provide an ignition furnace for a sintering machine that can improve the yield of sintered ore.

  In order to solve the above-mentioned problems, the sintering furnace according to the present invention includes a plurality of main burners facing the upper layer of the sintering raw material conveyed by the conveying means at predetermined intervals in the width direction of the furnace. A main ignition furnace and an auxiliary ignition furnace in which an auxiliary burner facing both ends of the upper layer in the width direction is disposed in the furnace, and the auxiliary ignition furnace is downstream of the main ignition furnace in the conveying direction of the sintering raw material Sintering, characterized in that the flames of the main burner and the auxiliary burner, which are arranged adjacent to each other and face both ends in the width direction of the upper layer, are continuously emitted toward both ends in the width direction of the upper layer. Machine ignition furnace.

  According to the ignition furnace of the sintering machine of the present invention, the auxiliary ignition furnace is disposed adjacent to the main ignition furnace downstream in the conveying direction of the sintering raw material, and the main burner faces both ends in the width direction of the upper layer of the sintering raw material. Since the flame of the auxiliary burner is continuously emitted toward both end portions in the width direction of the upper layer, the ignition time at the width direction end portion of the upper layer of the sintering raw material is the ignition in the center in the width direction of the upper layer. Extended compared to time, even if both ends of the sintering raw material in the width direction burn, it becomes difficult for heat to be easily taken away by the wall of the conveying means, so it is possible to suppress a decrease in the yield of the upper layer at both ends of the sintered ore width direction. can do. Therefore, since the area | region where a yield falls significantly reduces, the yield of a sintered ore can be improved.

Hereinafter, an ignition furnace of a sintering machine according to the present invention will be described with reference to the drawings.
FIGS. 1 to 3 show an embodiment of a main part of a sintering machine according to the present invention, FIG. 1 is a plan view showing the vicinity of an ignition furnace of the sintering machine, and FIG. 2 is II-II in FIG. FIG. 3 is a view taken along line III-III in FIG.
In the present embodiment, the conveyor 2 is charged with the sintered raw material M and conveyed in the direction of the arrow, the ignition furnace 4 is disposed upstream of the conveyor 2 and ignites the upper layer M1 of the sintered raw material M, and the conveyor 2 And a blower 6 for sucking air from the upper layer M1 to the lower layer M2 of the sintering raw material M on the conveyor 2.

As shown in FIG. 2, the conveyor 2 includes a saw-like bottom portion 2 a and wall portions 2 b that rise from both ends of the bottom portion 2 a in the width direction, and the sintering raw material M has a height substantially equal to that of the wall portion 2 b. And transport it in the direction of the arrow.
As shown in FIG. 1, the ignition furnace 4 includes a main ignition furnace 8 and an auxiliary ignition furnace 10 disposed adjacent to the main ignition furnace 8 on the downstream side in the conveying direction of the sintering raw material M. .

As shown in FIG. 2, the main ignition furnace 8 is disposed at a predetermined interval in the width direction by being supported by the furnace body 12 that surrounds the entire width direction of the conveyor 2 from above, and the furnace body 12. It comprises a plurality of main burners 14 facing the upper layer M1 of the metal M.
As shown in FIG. 3, the auxiliary ignition furnace 10 is disposed at two positions in the width direction of the conveyor 2, and the furnace body 16 surrounding the width direction end of the conveyor 2 from above, The auxiliary burner 18 is supported by the main body 16 and faces the end in the width direction of the upper layer M1 of the sintered metal M.

On the other hand, the blower 6 is continuously arranged below the conveyor 2 from the upstream side to the downstream side, and sucks air from the upper layer M1 toward the lower layer M2 with respect to the sintering raw material M ignited in the ignition furnace 4. Keep doing.
Next, the effect of the sintering machine of this embodiment provided with the ignition furnace 4 of the said structure is demonstrated.
When fuel is supplied to the main burner 14 and the auxiliary burner 18 of the ignition furnace 4 and a flame is emitted from each burner, the upper layer M1 of the sintering raw material M carried into the upstream side of the conveyor 2 is ignited. The conveyor 2 advances at a constant speed, and air is continuously sucked from the upper layer M1 to the lower layer M2 of the sintered raw material M on the conveyor 2 by the blower 6, so that the combustion zone of the sintered raw material M is gradually lowered. Expand in the direction. And the sintering raw material M will be in a molten state temporarily with the heat which generate | occur | produced by combustion, and a cake-like sintered ore is baked by solidifying again.

  Here, in the present embodiment, the ignition furnace 4 includes a main ignition furnace 8 and an auxiliary ignition furnace 10, and the flame of the main burner 14 of the main ignition furnace 8 is used in the width direction of the upper layer M1 of the sintering raw material M. After radiating to the end portion, the flame of the auxiliary burner 18 of the auxiliary ignition furnace 10 is subsequently radiated to the width direction end portion of the upper layer M1 of the sintering material M, and the ignition of the width direction end portion of the upper layer M1 of the sintering material M is performed. The time is extended from the ignition time at the center in the width direction of the upper layer M1.

Thus, by extending the ignition time of the width direction end of the upper layer M1 of the sintering raw material M, it is difficult for the wall 2b to be deprived of heat even if it is in contact with the wall 2b of the conveyor 2, as shown in FIG. As shown, the region where the yield of the upper layer at both ends in the width direction of the sintered ore is 60% is significantly reduced.
Further, when the upper layer M1 of the sintering material M is ignited by the main burner 14 of the ignition furnace 4, unburned residue due to uneven ignition of the sintering material M present on the wall 2b side is likely to occur. The auxiliary burner 18 enables reignition, thereby improving the yield.

Thus, since this embodiment can suppress the yield fall of the upper layer of the width direction both ends of a sintered ore, it can improve the yield of a sintered ore.
Moreover, since prevention of unburned residue can also be realized, the yield of sintered ore can be improved.

It is a top view which shows the ignition furnace of the sintering machine which concerns on this invention. It is the II-II arrow directional view of FIG. It is the III-III arrow directional view of FIG. It is a figure which shows the yield condition of the cross section of the width direction of a sintered ore when it ignites with the ignition furnace of the sintering machine of this invention. It is a figure which shows the yield condition of the cross section of the width direction of a sintered ore when it ignites with the ignition furnace of the conventional sintering machine.

Explanation of symbols

2 Conveyor (conveying means)
2a Bottom 2b Wall 4 Ignition furnace 6 Blower 8 Main ignition furnace 10 Auxiliary ignition furnace 12 Furnace body 14 Main burner 16 Furnace body 18 Auxiliary burner M Sintered raw material M1 Upper layer of sintered raw material

Claims (1)

A main ignition furnace in which a plurality of main burners facing the upper layer of the sintering material being conveyed by the conveying means are arranged at predetermined intervals in the width direction in the furnace;
An auxiliary ignition furnace in which an auxiliary burner facing both ends in the width direction of the upper layer is disposed in the furnace,
The auxiliary ignition furnace is disposed adjacent to the main ignition furnace downstream in the conveying direction of the sintering raw material, and the main burner facing the both ends in the width direction of the upper layer and the flame of the auxiliary burner are An ignition furnace for a sintering machine, characterized in that it continuously radiates toward both ends in the direction.

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