JP6848913B2 - Metal melting equipment with lightweight debris removal equipment - Google Patents

Description

The present invention relates to a metal melting facility having a lightweight dust removing device for removing lightweight dust from metal scrap.

As a means of melting an iron source such as iron-based scrap, coke as a heat source and iron-based scrap as an iron source are charged into a tubular furnace body, and high-temperature air is blown from the lower tuyere inside the furnace. A vertical melting furnace for burning coke is known (for example, Patent Document 1).

The vertical melting furnace (also called a melting furnace) has a raw material charging section for charging iron scrap and coke provided at the top of the furnace body and a tuyere provided at the top of the furnace body. It further has an exhaust duct for discharging air and a dust collector provided in the middle of the exhaust duct.

Japanese Unexamined Patent Publication No. 2010-14319

By the way, lightweight dust such as plastic and cloth is often mixed in metal scrap such as iron scrap. Lightweight waste comes in a variety of sizes, including relatively large ones. Coke burns near the tuyere of the iron melting furnace and the temperature is high, but the temperature near the upper part of the furnace body is about 100 ° C to 200 ° C. The air blows away from the scrap and is sucked into the dust collector through the exhaust duct. Since the dust collector is for processing powder (dust) generated in the furnace, lighter dust larger than that may clog the dust collector. In order to deal with this, it is conceivable to preheat the scrap in advance to burn the lightweight waste, or to reduce the volume by deformation. However, in the case of combustion, a place for combustion and large-scale equipment such as combustion and waste gas treatment are required. Furthermore, it is also necessary to prevent the generation of harmful substances such as dioxins. In addition, when reducing the volume of lightweight waste, in addition to problems with space and equipment, the reduced lightweight waste blocks the voids in the scrap and deteriorates the air permeability in the melting furnace, which is a problem in operation. May cause problems.

Therefore, an object of the present invention is to provide a metal melting facility having a lightweight dust removing device capable of easily and safely removing lightweight dust contained in metal scrap melted in a melting furnace.

In order to solve the above problems, the present invention provides the following (1) to (10).

(1) A lightweight dust removing device that removes lightweight dust from metal scrap supplied to a melting furnace that melts metal scrap.
A dust remover that removes lightweight dust from metal scrap,
A lightweight dust removing device comprising a blower device that blows air to a metal scrap existing in the dust removing portion to discharge the lightweight dust contained in the metal scrap.

(2) The lightweight dust removing device according to (1), wherein the dust removing device is installed at a position different from that of the melting furnace.

(3) The lightweight dust removing device according to (2), wherein the blower is installed on at least one of a side surface or a bottom surface of the dust removing portion.

(4) The lightweight dust removing device according to (2), wherein the dust removing unit is a container for accommodating metal scrap, and the blower is provided in the container.

(5) A metal melting facility having a melting furnace for melting metal scrap and a lightweight dust removing device for removing lightweight dust from metal scrap.
The melting furnace
A furnace body provided below the lightweight dust removing device, to which metal scrap is supplied from the lightweight dust removing device to melt the metal scrap, and a furnace body.
An exhaust port provided between the furnace body and the lightweight dust removing device,
It has a tuyere that blows hot air from the bottom of the furnace body into the furnace body.
The lightweight dust removing device is
The entrance where metal scrap is charged from the top, and
A dust removal unit that continuously stores metal scrap inside the inlet and removes lightweight dust from the metal scrap.
A discharge port that discharges metal scrap from the dust removal unit and supplies the metal scrap to the furnace body, and
A metal melting facility having a blower for blowing metal scrap existing in the dust removing portion.

(6) The metal melting equipment according to (5), wherein the blower is provided in the lower part of the dust removing portion and takes in air from the outside of the melting furnace.

(7) The blower is installed outside the melting furnace, the blower and the dust removing portion are connected by a pipe, and air is blown into the dust removing portion from a blower port at the tip of the pipe. The metal melting equipment according to (5).

(8) The direction of blowing air from the blower into the dust removing portion is characterized by having an angle of more than 0 ° and less than 90 ° with respect to the longitudinal direction of the dust removing portion (5). The metal melting equipment according to any one of 7).

(9) The air blowing speed when the air is blown from the air blower is set to 0.8 to 1.2 times the air blowing speed from the tuyere (5) to (8). The metal melting equipment described in either.

(10) The metal melting according to any one of (5) to (9), wherein the metal scrap is iron-based scrap, and a charcoal material is charged into the melting furnace together with the iron-based scrap. Facility.

According to the present invention, the metal scrap existing in the dust removing portion is blown from the blower to release the lightweight dust contained in the metal scrap, so that the lightweight dust contained in the metal scrap can be easily and safely removed. Can be done.

It is a figure which shows the iron melting equipment which is the metal melting equipment which concerns on 1st Embodiment of this invention. It is a figure which shows the state of charging iron scrap into a container. In the first embodiment of the present invention, it is a figure which shows the state which puts the iron scrap after removing the lightweight dust into a melting furnace. It is a figure which shows the iron melting equipment which is the metal melting equipment which concerns on 2nd Embodiment of this invention. It is a figure which shows the iron melting equipment which is the metal melting equipment which concerns on 3rd Embodiment of this invention. It is a figure which shows the state which charges the iron scrap into a melting furnace in the 3rd Embodiment of this invention. It is a figure which shows the modification of the 3rd Embodiment of this invention. It is a figure which shows the other modification of the 3rd Embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

<First Embodiment>
FIG. 1 is a diagram showing an iron melting facility which is a metal melting facility according to the first embodiment of the present invention. The iron melting equipment 1 has a melting furnace 2 and a lightweight dust removing device 3.

The melting furnace 2 is configured as a vertical melting furnace, and has a furnace body 21 and a storage pipe 22 provided on the furnace body 21. The upper part of the storage pipe 22 has an inlet 26 for charging iron scrap 11 which is metal scrap and coke 12 which is carbonaceous material. The iron-based scrap 11 and coke 12 charged from the charging port 26 are temporarily stored in the storage pipe 22, discharged from the discharge port 27 at the bottom of the storage pipe 22, and supplied into the furnace body 21. At the bottom of the furnace body 21, a tuyere for blowing high-temperature air and an ironing port for tapping hot metal (neither of them is shown) are provided. An exhaust port 23 is formed between the furnace body 21 and the storage pipe 22, and an exhaust duct 24 is connected to the exhaust port 23. The exhaust duct 24 is provided with a dust collector 25 that collects powder dust and the like generated in the furnace body 21.

The lightweight dust removing device 3 includes a dust removing unit 32 that removes lightweight dust from iron scrap and a fan that blows air to the iron scrap 11 existing in the dust removing unit 32, which is provided at a position away from the melting furnace 2. and a blower 33 composed of. In the present embodiment, as shown in FIG. 2, the iron-based scrap 11 is charged into the container 31 together with the lightweight dust 14 in which the iron-based scrap 11 attracted by the electromagnet 13 is mixed, and the iron-based scrap 11 contains the lightweight dust 14. The system scrap 11 is transported to the dust removing unit 32 in a state of being contained in the container 31. The blower 33 blows air to the iron-based scrap 11 including the lightweight dust 14 housed in the container 31. A plurality of blower devices 33 are arranged so as to blow air evenly between the iron-based scraps 11 in the container 31 so as to face the side surface, the bottom surface, or both of the container 31. The diameter of the blower 33 is preferably large from the viewpoint of increasing the amount of blown air, but an appropriate size is selected in consideration of installability.

Wall of the container 31 has a structure in which voids through which air is formed, by being blown into the container 31 present in the blower 33 Karagomi removal unit 32, iron by blowing air Lightweight dust 14 such as plastic and cloth contained in the scrap 11 is discharged to the outside of the container 31 and removed. The removed lightweight waste is collected by a collection device (not shown). The number, arrangement position, and orientation of the blower 33 are not limited to FIG. 1, and are appropriately set so that the lightweight dust 14 can be easily removed.

In the present embodiment, the container 31 is a bucket for charging the raw material into the melting furnace 2, and the bottom is a lid that can be opened and closed. After the lightweight waste 14 is removed from the iron-based scrap 11, the container 31 is transported above the charging inlet 26 of the melting furnace 2, and the iron-based scrap 11 is charged into the melting furnace 2.

In the iron melting facility 1 configured as described above, first, as shown in FIG. 2, iron-based scrap 11 including the lightweight dust 14 attracted by the electromagnet 13 is charged into the container 31, and the container 31 is removed. Transport to section 32. In the dust removing unit 32, the blower 33 blows air at an appropriate amount, so that the blown air passes through the voids of the iron-based scrap 11 in the container 31 and is discharged upward. At this time, the lightweight dust 14 contained in the iron-based scrap 11 is discharged to the outside of the container 31 by the air blown from the blower 33 and removed. The removed lightweight waste is collected by a collection device (not shown).

After that, the container 31 is transported above the inlet 26 of the melting furnace 2. Then, as shown in FIG. 3, the lid 31a at the bottom of the container 31 which is a bucket is opened, and the iron-based scrap 11 in the lid 31a is charged into the melting furnace 2 from the charging port 26. If there is no lid 31a at the bottom of the container 31, the container 31 may be rotated to charge the container 31.

If necessary, coke may be charged into the container 31. When coke is also contained in the container 31, coke is charged together with the iron-based scrap 11. Only coke may be charged into the melting furnace 2 by another means.

In the melting furnace 2, iron-based scrap 11 and coke 12 are charged into the storage pipe 22 from the container 31 and the like via the inlet 26, and these are sequentially supplied into the furnace body 21. In the melting furnace 2, as shown in FIG. 1, the iron-based scrap 11 and the coke 12 are filled in the furnace body 21 so as to be layered, and in this state, the tuyere at the bottom of the furnace body 21 (not shown). ), High-temperature air is blown into the furnace to burn the coke 12, and the heat melts the iron-based scrap 11 which is an iron source. The hot metal obtained by melting is taken out of the furnace from a hot metal outlet (not shown) at the bottom of the furnace body 21. The air blown into the furnace body 21 burns coke to generate CO gas, CO ₂ gas, etc. (hereinafter, these are collectively referred to as in-fire gas), and during coke combustion or iron-based scrap. It rises while entraining fine dust generated during melting.

Then, the gas in the furnace containing dust and the like generated in the furnace body 21 is discharged from the exhaust port 23 provided between the furnace body 21 and the storage pipe 22 through the exhaust duct 24. Dust and the like in the gas in the furnace are collected by the dust collector 25.

When the iron-based scrap 11 containing the lightweight dust is supplied to the melting furnace 2, the lightweight dust is separated from the scrap by blowing air from the tuyere at the upper part of the furnace body 21 having a low temperature, and the dust collector 25 However, in the present embodiment, the iron-based scrap 11 from which the lightweight dust has been removed by the lightweight dust removing device 3 is supplied into the furnace body 21, so that the dust collecting device 25 is clogged. It also has the effect of suppressing clogging.

The total amount of lightweight dust removed from the iron-based scrap 11 does not have to be the total amount, and only those that may be transported to the dust collector 25 by the air blown from the tuyere may be used. Therefore, the blowing speed of the blowing device 33 in the lightweight dust removing device 3 is preferably about the same as the blowing speed from the tuyere. Specifically, it is desirable to set the air flow rate of the air blower so that the air flow rate from the tuyere to the inside of the furnace is 0.8 to 1.2 times the air velocity. Even if there is lightweight dust that is not removed by the blower 33 even if it is blown with such an amount of air, it does not separate from the scrap due to the air blown from the tuyere in the furnace body 21 and is kept in the high temperature furnace. It does not matter because it is burned.

Lightweight dust removing apparatus 3 of the present embodiment is for removing light debris from ferrous scrap 11 in the container 31 by the air from the blower 33 to remove light debris from easily and safely ferrous scrap be able to.

<Second embodiment>
FIG. 4 is a diagram showing an iron melting facility which is a metal melting facility according to a second embodiment of the present invention. The iron melting equipment 1'of the present embodiment has a lightweight dust removing device 3'in which the blower 33 is integrated with the container 31 instead of the lightweight dust removing device 3 of the iron melting equipment 1 of the first embodiment. are doing. In this example, the container 31 itself serves as a dust removing portion for iron-based scrap.

Since the lightweight dust removing device 3'has such a configuration, the lightweight dust 14 can be removed at an arbitrary position. For example, FIG. 4 shows a state in which the lightweight dust 14 is removed by the lightweight dust removing device 3'at a position away from the melting furnace 2, but the present invention is not limited to this, and the container 31 is moved to the upper part of the melting furnace 2. The lightweight waste 14 may be removed in the transported state.

<Third embodiment>
FIG. 5 is a diagram showing an iron melting facility which is a metal melting facility according to a third embodiment of the present invention. The iron melting equipment 1 ″ of the present embodiment has a structure in which the melting furnace 2 and the lightweight dust removing device 3 ″ are integrated.

Specifically, the storage pipe 22 of the melting furnace 2 functions as a dust removing unit of the lightweight dust removing device 3 ″, and the storage pipe 22 as the dust removing unit is provided with a blower 33. A storage pipe 22 is used as a dust removing unit of the removing device 3 ″. The lightweight dust removing device 3 ″ further discharges the iron scrap 11 and the like from the storage pipe 22 and the charging inlet 26 for charging the iron scrap 11 and the like into the storage pipe 22 which is the dust removing portion, and discharges the iron scrap 11 and the like into the furnace body 21. It has an discharge port 27 for supplying iron-based scrap 11. Further, an intake air for sucking air blown by the blower 33 from the outside of the melting furnace 2 and preventing gas in the furnace from being discharged from the charging port 26. As a means, an intake space 34 is provided.

In the present embodiment, as shown in FIG. 5, the storage pipe 22 has a double pipe structure, and the space between the inner pipe and the outer pipe is an intake space 34 as an intake means. The upper end of the intake space 34 is an intake port 34a formed so as to go around the outside of the inlet 26. The blower 33 is provided in the inner pipe of the storage pipe 22, and by operating the blower 33, the outside air is taken into the intake space 34 from the intake port 34a and blown from the blower 33 to the inside of the storage pipe 22. Will be done. A blower 33 may be embedded in the outer wall of the storage pipe 22 so that the outside air can be directly taken into the storage pipe 22 and blown as an intake means.

By charging the iron-based scrap 11 into the storage pipe 22 from the container (bucket) 31 for transporting the iron-based scrap and blowing air from the blower 33, the lightweight waste 14 contained in the iron-based scrap 11 is removed from the storage pipe 22. It is released to the outside and removed. The removed lightweight waste is collected by a collection device (not shown).

A plurality of blower devices 33 are arranged on the inner wall of the storage pipe 22 in order to evenly blow air between the iron-based scraps 11 charged in the storage pipe 22. The diameter of the blower 33 is preferably large from the viewpoint of increasing the amount of blown air, but it is preferably 1/2 or less of the inner diameter of the storage pipe 22 in consideration of installability. It is desirable that the position of the blower 33 in the height direction is provided at the lower part of the storage pipe 22 so that the blower from the blower 33 passes through as many voids as possible in the iron-based scrap.

The melting furnace 2 is configured in the same manner as in the first embodiment except that the lightweight dust removing device 3 ″ is installed in the upper part of the furnace body 21.

In the iron melting facility 1 ″ configured as described above, as shown in FIG. 2, the iron-based scrap 11 including the lightweight dust 14 attracted by the electromagnet 13 is charged into the container 31, and the container 31 is removed from the lightweight dust. Transport above the inlet 26 of device 3 ″ (storage tube 22). Then, as shown in FIG. 6, the lid 31a at the bottom of the container 31 is opened, and the iron-based scrap 11 in the lid 31a is charged into the storage pipe 22 from the charging inlet 26. If there is no lid 31a at the bottom of the container 31, the container 31 may be rotated to charge the container 31.

In FIG. 6, the container 31 remains at the upper part of the storage pipe 22 even after the iron-based scrap 11 is discharged. However, after the iron-based scrap 11 is discharged, the container 31 is moved from the upper part of the storage pipe 22. The lightweight dust 14 may be removed.

In the lightweight dust removing device 3 ″, the iron-based scrap 11 from the container 31 is charged into the storage pipe 22 via the charging port 26. The iron-based scrap 11 serves as a dust removing portion of the lightweight dust removing device 3 ″. By blowing air from the blower 33 to the iron-based scrap 11 at an appropriate amount in the process of being charged into the functioning storage pipe 22 or after being charged, the blown air is blown into the iron-based scrap 11 in the storage pipe 22. It passes through the void and is discharged upward. At this time, the lightweight dust 14 contained in the iron-based scrap 11 is discharged and removed above the storage pipe 22 by the air blown from the blower 33. The removed lightweight waste is collected by a collection device (not shown).

After the iron-based scrap 11 from which the lightweight dust has been removed is supplied into the furnace body 21, the coke 12 is supplied. These are sequentially and alternately supplied into the furnace body 21 and filled in the furnace body 21 so that the iron-based scrap 11 and the coke 12 are layered. In this state, the tuyere at the bottom of the furnace body 21 (shown). High-temperature air is blown into the furnace to burn the coke 12, and the heat of the combustion gas melts the iron-based scrap 11 which is an iron source. The hot metal obtained by melting is taken out of the furnace from a hot metal outlet (not shown) at the bottom of the furnace body 21. The means of supplying coke is not particularly limited. The coke may be charged in another container, or a conveyor or the like may be used.

Also in this embodiment, since the iron-based scrap 11 from which the lightweight dust has been removed by the lightweight dust removing device 3 ″ is supplied into the furnace body 21, clogging of the dust collector 25 can be suppressed.

If there is no problem in removing the lightweight dust, the coke may be stored on the iron-based scrap 11 in the container 31 and charged into the lightweight dust removing device.

Also in this embodiment, the lightweight dust removed from the iron-based scrap 11 may be only one that may be transported to the dust collector 25 by blowing air from the tuyere, and the light-weight dust removing device 3 ″ blows air. It is desirable that the blowing speed of the device 33 is about the same as the blowing speed from the tuyere, specifically, the blowing speed is 0.8 to 1.2 times the speed inside the furnace due to the tuyere blowing.

If the ventilation speed is less than 0.8 times the speed inside the furnace by blowing the tuyere, in addition to not being able to efficiently remove lightweight dust, the gas inside the furnace that has been introduced from the tuyere and has passed through the furnace is charged. It may reach the entrance and cause the problems described below. Further, even if the blowing speed exceeds 1.2 times the speed inside the furnace due to the tuyere blowing, the iron-based scrap becomes a resistance and the efficiency of removing lightweight dust does not increase. Therefore, it is desirable that the blowing speed is 0.8 to 1.2 times the speed inside the furnace due to the tuyere blowing.

As described above, it is possible to preheat scrap to reduce its volume in plastics, cloths, etc. However, in the case of burning, large-scale equipment as described above is required, and in this embodiment, it is mounted. Near the entrance, there are many incidental facilities such as equipment for transporting iron scrap and coke, and equipment for opening and closing the entrance. Since the furnace gas has a temperature of 100 ° C. to 200 ° C., when the furnace gas reaches the inlet, it may affect the above-mentioned ancillary equipment. _{In addition, since it contains harmful components such as CO and CO 2} generated from iron scrap and coke, it is necessary to take measures to prevent the gas in the furnace from being released to the outside. Therefore, it is difficult to install new equipment.

In contrast, lightweight dust removal apparatus 3 of the present embodiment "is intended to remove light debris from ferrous scrap 11 in the container 31 by blowing from the blower 33 to the storage tube 22, blower 33 Since the gas in the furnace is prevented from entering and passing through the iron-based scrap by being blown from the air, there is no effect on the ancillary equipment and the release of the gas in the furnace to the outside is suppressed. Lightweight dust can be safely removed from iron scrap.

In the present embodiment, not only the blower 33 is installed parallel to the longitudinal direction of the storage pipe 22 as shown in FIG. 5 (the inclination is 0 ° with respect to the longitudinal direction of the storage pipe 22), but also as shown in FIG. The blower 33 may be arranged at an angle of more than 0 ° and less than 90 ° with respect to the longitudinal direction of the storage pipe 22 so that the blower direction of the blower 33 is directed toward the inlet 26. As a result, the pressure of the upward blast is increased, and more lightweight dust can be discharged to the outside of the furnace.

Further, as shown in FIG. 8, instead of providing the blower 33 directly on the storage pipe 22, the blower 33 is installed outside the melting furnace 2, and the blower pipe 35 is provided from the blower 33 to the storage pipe 22. , The air may be blown into the storage pipe 22 from the air outlet 35a at the tip of the air pipe 35. By installing the blower 33 outside the furnace in this way, it is possible to use the blower 33 having the required capacity regardless of the size of the melting furnace 2. Further, since the operator can easily access the blower 33, the maintainability is remarkably improved.

In FIG. 8, the air outlet 35a is provided parallel to the longitudinal direction of the storage pipe 22 (the inclination is 0 ° with respect to the longitudinal direction of the storage pipe 22), but the air outlet 35a is provided in the longitudinal direction of the storage pipe 22. It may be tilted at an angle of more than 0 ° and less than 90 °. Further, in FIG. 8, two blower devices 33 are connected to the storage pipe 22 by separate blower pipes 35, but the blown air is branched from one blower device 33 by using a pipe to store the storage pipe. It may be supplied within 22.

<Other applications>
Although some embodiments of the present invention have been described above, the present invention is not limited to the above embodiments and can be variously modified without departing from the gist of the present invention.

For example, in the above embodiment, the case where the iron-based scrap is charged into the container or the storage pipe is blown into the iron-based scrap by the blower is shown, but the present invention is limited to this. Instead, for example, a transport means such as a belt conveyor can be used as a dust removing unit, and when the iron scrap is transported by the transport means, the blower can blow the iron scrap.

Further, in the above embodiment, an example in which the present invention is applied to an iron melting facility for producing hot metal using iron scrap and coke as a carbonaceous material has been shown, but the present invention is not limited to iron scrap, but aluminum, copper, etc. It can be applied to other metal scrap melting furnaces, and it goes without saying that as the carbonaceous material, other than coke, for example, ferro-coke, solidified tar or pitch, etc. can be used. Further, in the above embodiment, the charcoal material is used as the heat source, but the charcoal material is not limited to the one, and another heat source such as an arc may be used.

1, 1', 1 "iron melting equipment 2 melting furnace 3, 3', 3" lightweight dust remover 11 iron scrap 12 coke
13 Electromagnet
14 Lightweight waste 21 Furnace 22 Storage pipe 23 Exhaust port 24 Exhaust duct 25 Dust collector 26 Equipment inlet 27 Discharge port 31 Container 32 Dust removal unit 33 Blower 34 Intake space 35 Blower pipe 35a Blower

Claims (6)

A metal melting facility having a melting furnace for melting metal scrap and a lightweight dust removing device for removing lightweight dust from metal scrap.
The melting furnace
A furnace body provided directly below the lightweight dust removing device, to which metal scrap is supplied from the lightweight dust removing device to melt the metal scrap, and a furnace body.
An exhaust port provided between the furnace body and the lightweight dust removing device,
It has a tuyere that blows hot air from the bottom of the furnace body into the furnace body.
The lightweight dust removing device is
The entrance where metal scrap is charged from the top, and
A dust removal unit that continuously stores metal scrap inside the inlet and removes lightweight dust from the metal scrap.
A discharge port that discharges metal scrap from the dust removal unit and supplies the metal scrap to the furnace body, and
Possess a blower for blowing air to the scrap metal present in the dust removal unit,
The melting furnace and the lightweight dust removing device are integrally provided, and the metal scrap from which the lightweight dust has been removed is discharged from the discharge port, falls, and is directly supplied to the furnace body directly below. Metal melting equipment. The metal melting equipment according to claim 1 , wherein the blower is provided below the dust removing portion and takes in air from the outside of the melting furnace. The blower is installed outside the melting furnace, the blower and the dust removing portion are connected by a pipe, and air is blown into the dust removing portion from a blower port at the tip of the pipe. The metal melting equipment according to claim 1. Claims 1 to 3 , wherein the blowing direction from the blower into the dust removing portion has an angle of more than 0 ° and less than 90 ° with respect to the longitudinal direction of the dust removing portion. The metal melting equipment according to any one item. Blower speed when blown from the blower, any one of claims 1 to 4, characterized in that it is set to 0.8 times to 1.2 times the blast velocity from the tuyere The metal melting equipment described in the section. The scrap metal is ferrous scrap, wherein the melting furnace, the metal melting facility according to claims 1, characterized in that carbonaceous material with iron scrap is charged in any one of claims 5 ..

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