JPH072894U - Sintering machine air leak 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 smelter feed and discharge ore and the bottom surface of the pallet. [Structure] On a seal plate 3 provided between a lower surface of a pallet 1 and a wind box 2, a block 12 having a magnet 4 and a metal wire 11 of a ferromagnetic material attached in a brush shape is arranged. By adsorbing the magnetic powder between the metal wires 11 and on the magnet 4, the gap between the lower surface of the pallet 1 and the seal plate 3 is closed. [Effect] Since the magnetic powder is strongly adsorbed by the magnetic force of the magnet and the metal wire, it is not blown away by the wind force generated by the negative pressure in the wind box, and the gap between the bottom surface of the pallet and the seal plate is blocked to prevent leakage of air. It can be prevented. The power consumption of the sintering blower and the gas processing equipment can be reduced.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 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 generally 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, and the loaded raw material on the pallet 1 is ignited by 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 air permeability of the sintered zone and the raw material layer is large, and the pressure in the wind box 2 is lowered to about −1000 to −2000 mmAq. The air leakage between the pallet 1 and the air box 2 caused by this negative pressure is about 15% of the amount of sintering exhaust air, which causes an increase in the electric 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 leak prevention device arranged at the end of the wind box 2 on the mine 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 was a gap in.

Normally, 50 to 200 pallets are installed per sinter, 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 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, and the amount of electric power of the suction blower is about 6 kWh / H per ton of product sintered ore.

Many countermeasures have been attempted up to the present day in order to solve this air leak, 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 providing a seal plate in the upper part around the rotating shaft and a counterweight 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, the pallet frame and the seal plate are severely worn, and the service life is shortened.The temperature near the seal plate is high. The pallet frame and the seal plate collide with each other and the seal plate is damaged.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 securely seals the gap between the sinter machine pallet and the wind box, which eliminates the drawbacks of the conventional air leak prevention device with complicated structure in expensive equipment. It is to prevent the invasion of the atmosphere into the sinter exhaust air and to save energy.

[0010]

[Means for Solving the Problems]

 The gist of the present invention is a device for preventing air leakage from a sintering machine, characterized in that a block on which a metal wire is attached in a brush shape and a magnet are arranged on a seal plate.

[0011]

[Action]

 Usually, magnetite, which is a magnetic substance, 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 arranged on the seal plate, captured by the magnet, 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 a large power saving. In addition, the dust-exhaust equipment for exhaust air from the combustor can be downsized by about 12%, resulting in significant improvement effects.

[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 on the mine side of a wind box, and FIG. 2 is a view taken along the line AA of FIG. Here, the end of the wind box on the ore side refers to the surface of the four sided air box that is closest to the ore supply 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 and a seal plate 3 on which a block 4 to which a magnet 4 and a ferromagnetic metal wire 11 are attached is arranged.

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, as shown in FIG. 2, the lower surface of the pallet frame 7 is not continuous but is intermittent, and at least the pallet frame 7 is required to constantly seal the discontinuous lower surface of the pallet frame 7. Magnets and metal wires need to be installed in the length range between the and pallet frame.

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 this 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 powder of the magnetic material. This is done by fixing the magnets and ferromagnetic metal wires to the upper surface of the seal plate in a brush shape and perpendicular to the plate so that the magnets and the brush-shaped metal wires magnetized by the magnets form ferromagnetic powder. It is a method of adsorption. The force required for the metal wire to capture the powder between the lower surface of the pallet frame and the seal plate and the force with which the magnet captures the powder differ depending on the distance between the lower surface of the pallet frame and the seal plate. The magnetic flux density of 2300 Gauss may be a relatively small magnetic force. Therefore, using a magnet that can magnetize more than 2300 gauss can sufficiently prevent air leakage. Any kind of magnet may be used as long as it has a magnetizing ability of 2300 gauss or more, and examples thereof include a permanent magnet and an electromagnet. When using permanent magnets, inexpensive ferrite magnets can be used effectively without using expensive rare earth magnets.

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

The thickness of the metal wire may be such that the metal wire bends easily by elastic deformation when hitting 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 that fixes the block in which the metal wire is brushed to the seal plate are not particularly limited, and any material such as metal, rubber, ceramics, etc. may be used as long as it is a ferromagnetic material. The shape may be linear, plate-like, columnar or the like as long as it is elastically deformable. If the distance between the metal wires on the block is 1 mm or less, the magnetite powder can be sufficiently captured.

The size and pitch of the magnets and blocks attached to the seal plate are determined by the width of the lower end of the pallet frame, and the size and pitch of the magnets and blocks are always set within the width of the pallet frame. The arrangement may be a staggered arrangement, a lattice arrangement, a linear combination arrangement, or a combination thereof.

When a tough magnet is used, the seal plate itself may be made of a 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 is passed 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 be applied to the end of the wind box other than the end on the mine side and the connection part of the wind box between the mine and the mine. Here, the air box connection between the supply and discharge ore refers to the two surfaces of the air box formed by the four surfaces that intersect at right angles to the direction of travel of the sintering machine.

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

[0027]

[Table 1]

[0028]

[Effect of 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 deterioration in performance due to thermal strain, pallet vertical or horizontal vibration, and replacement is extremely easy. Furthermore, due to its excellent sealing property, the air leakage rate can be reduced from 15% to 3% at once, and the power of the exhaust blower can be saved and the quality of the sinter can be stably burned by preventing air leakage. It is an air leakage prevention device.

[Brief description of drawings]

FIG. 1 is a partially cutaway cross-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 trolley 7 Pallet frame 8 Feeding hopper 9 Sprocket 10 Ignition furnace 11 Ferromagnetic metal wire 12 Block

Claims (1)

[Scope of utility model registration request] 1. A device for preventing leakage of air from a sintering machine, comprising: a block on which a metal wire is attached in a brush shape and a magnet are arranged on a seal plate.