JPH0552697U - Sintering machine air leakage prevention device - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce energy consumption by reducing the amount of air leaking into the wind box from the gap between the wind box at the end of the sinter supply and discharge ore and the bottom surface of the pallet. [Structure] A ferromagnetic metal wire 11 is attached in a brush shape on a seal plate 3 provided between the lower surface of the pallet 1 and the wind box 2, and a magnet 4 is fixed to the lower surface of the seal plate 3 to thereby form the metal wire 11. Magnetize. Magnetic powder is adsorbed between the brush-shaped metal wires 11 to close the gap between the lower surface of the pallet 1 and the seal plate 3. [Effect] The magnetic powder is strongly attracted by the magnet and the magnetic force of the metal wire, so it is not blown away by the wind force generated by the negative pressure in the wind box, and the leakage of air that passes through the gap between the pallet lower surface and the seal plate is prevented. I can. The power consumption of the sintering blower and the gas processing equipment can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a device for preventing air leakage between a pallet for a sintering machine and a wind box.

[0002]

[Prior Art]

 A commonly used sintering machine will be described with reference to the drawings. As shown in FIG. 3, raw materials composed of iron ore powder, limestone, and powder coke are cut out from a feed hopper 8 and loaded on a pellet 1. The pallet 1 is moved by a rotating sprocket 9, the loaded raw materials on the pallet 1 are ignited in an ignition furnace 10, and air is sucked downward from a wind box 2 arranged below the pallet 1. As a result, the sintering zone progresses downward from the upper part of the raw material layer, and the portion where the sintering zone passes becomes the sintered ore.

The sintering zone and the raw material layer have large airflow resistance, and the pressure in the wind box 2 is lowered to about −1000 to −2000 mmAq. The air leak between the pallet 1 and the wind box 2 caused by this negative pressure is about 15% of the amount of sintering exhaust air, which causes an increase in the power cost for the exhaust fan.

As shown in FIG. 4, most of the leaked air is generated from the gap between the seal plate 3 and the lower surface of the pallet frame 7. According to the investigation by the inventor, the air leakage prevention device arranged at the end of the wind box 2 on the feed side as shown in FIG. 4 has a gap between the seal plate 3 and the lower surface of the pallet frame 7 due to the following reasons. It was found that there is a gap in.

Normally, 50 to 200 pallets are installed per sintering machine, but since the vertical position of the lower surface of the pallet frame 7 is different, the seal plate 3 is aligned with the lower surface position of a certain pellet frame. However, when another pallet passes through the seal plate, there is a gap.

Since solid particles spilling from the sintering machine are sandwiched between the seal plate 3 and the pallet frame 7, the lower surfaces of the seal plate 3 and the pallet frame 7 are worn, resulting in a gap.

The amount of air leaked from these gaps is about 15% of the amount of air exhausted from the sintering machine, which is about 6 kWh / H per ton of product sintered ore in terms of the electric power of the suction blower.

Many measures have been attempted up to the present day to solve this leakage of air, and as a representative example, there is a device disclosed in Japanese Utility Model Laid-Open No. 60-12195. This is to seal by reducing the gap by pressing the seal plate against the bottom surface of the pallet frame by using the balance principle by installing a seal plate in the upper part around the rotating shaft and a counter weight in the lower part. However, in this device, the bottom surface of the palette frame and the seal plate come into contact with each other, so the pallet frame and the seal plate are heavily worn and the life is shortened.The temperature near the seal plate is high, so if the seal plate thermally deforms, The pallet frame collides with the seal plate and damages the seal plate.The vicinity of the seal plate is a bad environment where dust is present, and the temperature is high, which causes problems such as thermal strain in a few months. A complicated device with a rotating shaft like this device is prone to serious troubles and is not practical. A problem such as is not, both are high remodeling costs, device is trouble is often a complex, effective means for reasons such as that can not be achieved sufficiently the Mokaze prevention has not been realized it now.

[0009]

[Problems to be solved by the device]

 The object of the present invention is to provide an extremely simple device that reliably seals the gap between the sinter machine pallet and the air box, which eliminates the disadvantages of the conventional air leak prevention device with complicated structure in expensive equipment. The purpose is to save energy by preventing air from entering the sintering exhaust air.

[0010]

[Means for Solving the Problems]

 The gist of the present invention is to provide an end on the feeding / exhausting side and a feeding end of a wind box in a sintering machine made of a ferromagnetic material attached in a brush shape on a magnet plate or a ferromagnetic plate fixed on the magnet. -It is a device for preventing air leakage from the sintering machine at the connection of the wind box between the mine ores.

[0011]

[Action]

 Usually, magnetite, which is a magnetic material, is contained in the sintering raw material or the sintered ore. This magnetite is falling from the bottom surface of the pallet as powder particles. Magnetite is magnetized by the magnet attached to the seal plate or the ferromagnetic substance attached in the shape of a brush, and is trapped by the ferromagnetic substance attached to the magnet and the seal plate and deposited on the seal plate. This deposit closes the gap between the bottom surface of the pallet frame and the seal plate to prevent air leakage.

With the device of the present invention, the air leak rate of 15% is reduced to 3%, resulting in great power saving. In addition, the dust-exhaust equipment for the exhaust air from the combustor can be downsized by about 12%, resulting in significant improvements.

[0013]

【Example】

 Next, one embodiment shown in the drawings will be described in detail.

FIG. 1 shows an example in which the present invention is applied to a device for preventing air leakage at the end of the wind box on the mine side, and FIG. 2 is a view taken along the line AA of FIG. Here, the end of the wind box on the ore feed side means the surface of the air box that is formed of four sides that is closest to the ore feed side of the two surfaces that intersect at right angles to the advancing direction of the sintering machine.

The moving part is a pallet 1, a pallet truck 6, and a pallet frame 7, and the fixed part is a wind box 2, a seal plate 3 to which a ferromagnetic metal wire 11 is attached, and a magnet 4 attached to a seal plate.

The magnetic force of the magnet 4 fixed to the seal plate 3 may be any as long as it has a necessary attraction force for fixing magnetite to the magnet, and the kind of the magnet is not particularly limited.

Further, in the longitudinal direction of the sintering machine, the lower surface of the pallet frame 7 is not continuous but intermittent as shown in FIG. 2, and at least one pallet is required to constantly seal the discontinuous lower surface of the pallet frame 7. It is necessary to attach magnets and ferromagnetic metal wires over the length range of.

According to the investigation by the inventor, the pressure difference between the inside of the sintering air box and the outside air is usually 1000 to 2000 mmAq, and the outside air leaks at a flow velocity of 100 to 150 m / s. In such a state, in order to seal the space between the lower surface of the pallet frame and the seal plate with magnetic powder, it is necessary to capture the magnetic material with a ferromagnetic magnet.

The inventor has conducted a test to find a method for efficiently capturing the magnetic powder. This is because a ferromagnetic metal wire is fixed vertically to the plate in a brush shape on the upper surface of a seal plate with a magnet attached to the lower surface, so that the brush-shaped metal wire magnetized by the magnet is a powder of ferromagnetic material. Is a method of adsorbing. The force with which the metal wire captures the powder varies depending on the distance between the metal wire and the adjacent metal wire, but if the distance is about 2 mm, the magnetic flux density may be 300 gauss. The magnetic flux density of the seal plate lower magnet used in this case may be a relatively small magnetic force of 2300 gauss. Therefore, air leakage can be sufficiently prevented by using a magnet capable of magnetizing 2300 Gauss or more. Any kind of magnet can be used as long as it has a magnetizing ability of 2300 gauss or more, and examples thereof include permanent magnets and electromagnets. When using permanent magnets, inexpensive ferrite magnets do not have to be used, and inexpensive ferrite magnets are effective.

Further, in a sintering machine in which the amount of magnetite powder to be used as a seal on the seal plate is small, it is preferable to deposit magnetic powder such as iron powder on the seal plate in advance.

The thickness of the metal wire may be such that it easily bends by elastic deformation when it hits a pallet passing directly above the metal wire. 0. 5 mm is suitable. The length of the metal wire is preferably the length of the gap between the seal plate and the pallet frame. Here, the material and shape of the ferromagnetic material fixed to the seal plate in a brush shape are not particularly limited, and the material may be any material such as metal, rubber or ceramics as long as it is a ferromagnetic material, and the shape is elastically deformable. Any line shape, plate shape, columnar shape or the like may be used as long as it is. The magnet to be attached to the seal plate may be located on either the upper surface or the lower surface of the seal plate, but the lower surface is preferable when the powder or granules may fall from the pallet and damage the magnet. If a tough magnet is used, the seal plate itself may be made of magnet.

In the sintering machine, a gap is generated in the sliding portion between the moving portion and the fixed portion, and since the air pressure in the wind box is a negative pressure of −1000 to −2000 mmAq, air flows from the atmosphere side through the gap of the sliding portion. invade. Magnetite powder is fixed between the metal wires on the seal plate by the magnetic force of the magnet fixed to the seal plate so as to block this invasion path, and the gap is filled with the magnetite powder. As a result, air leakage is prevented.

The air leakage prevention device of the present invention can also be applied to the mine ore side end of the wind box other than the mine ore side end and the connection of the wind box between the supply and mine. Here, the connection of the wind box between the supply and discharge ore means the two surfaces of the wind box formed by the four surfaces, which intersect at right angles to the advancing direction of the sintering machine.

The results of the implementation of the present invention are shown in Table 1.

[0025]

[Table 1]

[0026]

[Effect of the device]

 The sinter air leakage prevention device of the present invention can prevent air leakage very easily with almost no modification of the air leakage prevention device between the sinter pallet frame and the air box that is commonly used. Is inexpensive and easy to implement. In addition, the sealing device is simple, and there is no performance deterioration due to thermal strain, vertical or horizontal vibration of the pallet, and replacement is extremely easy. Furthermore, due to its excellent sealability, the air leakage rate can be reduced from 15% to 3% all at once, and the power consumption of the exhaust blower can be reduced and the air quality can be stably sintered by preventing air leakage. It is an air leakage prevention device.

[Brief description of drawings]

FIG. 1 is a partially cutaway sectional view of an example of a sintering machine air leakage prevention device according to the present invention.

FIG. 2 is a view showing an arrow AA in FIG.

FIG. 3 is a diagram showing an outline of a sintering machine.

FIG. 4 is a partially cutaway sectional view of a conventional sintering machine air leak prevention device.

[Explanation of symbols]

 1 Pallet 2 Wind box 3 Seal plate 4 Magnet 5 Ferromagnetic material 6 Pallet truck 7 Pallet frame 8 Feeding hopper 9 Sprocket 10 Ignition furnace 11 Ferromagnetic metal wire

Claims (1)

[Scope of utility model registration request] 1. An end on the feeding / exhausting side of a wind box and a feeding / feeding end of a wind box in a sintering machine made of a ferromagnetic material fixed in a brush on an upper portion of a magnet or a ferromagnetic plate fixed to the upper portion of the magnet. Sintering machine air leakage prevention device at the connection of the wind box during the mine.