JP6862936B2 - Sinter cooler and method for recovering powdered sinter - Google Patents

Description

The present invention relates to a chiller for cooling sinter and a method for recovering powdered sinter blown out from the chiller.

Conventionally, in blast furnace operation, sintered ore obtained by sintering a sintering raw material such as iron ore powder, limestone, and coke powder with a sintering machine (for example, a DL type sintering machine) has been used as a main raw material for a blast furnace. However, since the sinter discharged from the sinter is in a high temperature state of 500 to 600 ° C, it can be transported by a blast furnace or the like with a blast furnace adjacent to the sinter, for example, up to about 100 ° C. Cooling.

As a cooling method, there are an upper suction method in which cooling air is sucked from the upper part with a blower through the sinter to cool it, and a lower blowing method in which cooling air is blown into the sinter from the lower part to cool it. The types of coolers are roughly divided into ring type and linear type.

FIG. 1 shows an aspect of a ring-shaped, lower-blow-in type cooler.

In the cooler shown in FIG. 1, a plurality of trough trolleys 1 on which sinter is placed on a lattice-shaped bottom plate are connected, and an annular shape is arranged on a rail floor 14 attached to a vertical wall 3a of a chamber 3. It is movably arranged on the rail 2 of the above by wheels 1a (see "clockwise dotted line" in the figure), and cooling air is blown into the sinter from under the trough carriage 1 at the lower part of the annular rail 2. The chambers 3 are connected and arranged by a blower pipe 4.

The upper part of the trough trolley 1 is provided with an exhaust stack 5 for exhausting the cooling exhaust air that has passed through the sintered ore (see "two-point chain wire" in the figure), and a hood cover 6 for covering the trough trolley 1 is arranged, and a chamber 3 is provided. A dust conveyor (not shown) for transporting the powdered sintered ore that has fallen into the chamber 3 is arranged in a lower portion of the chamber 3 surrounded by a dust conveyor casing 7.

The sinter discharged from the sinter 10 is sequentially charged into the trough trolley 1 from the sinter input port 8 of the cooler, and the trough trolley 1 goes around to the sinter section 9 (“clockwise” in the figure). (Refer to the dotted line) ”), the sinter is cooled to about 100 ° C by the cooling air blown from the chamber 3 through the bottom plate of the trough carriage 1, and the sinter is transported to the next process at the mine discharge section 9 (not shown). It is excreted above.

In a cooler as shown in FIG. 1 in which cooling air is blown into the sinter on the trough trolley from below to cool the sinter, in order to efficiently cool the sinter, a moving trough trolley and a fixed arrangement are used. It is necessary to ensure sufficient airtightness of the sliding portion by using a sealing means so that the cooling air does not leak from the sliding portion of the chamber.

FIG. 2 shows the AB cross-sectional structure of the cooler shown in FIG. In the trough carriage 1, the wheel 1a attached to the support member 11 rolls on the rail 2 arranged on the rail floor 14 attached to the vertical wall 3a of the chamber 3, and the excretion portion (see “9” in FIG. 1). ).

During the movement of the trough carriage 1, the cooling air blown into the chamber from the blower pipe 4 passes through the sinter 1a placed on the grid-like bottom plate of the trough carriage 1 (“2 upward in the figure 2” in the figure. (See "Point chain line"), the sinter 10a is cooled.

At the time of this cooling, the moving support member 11 and the sliding portion A of the fixedly arranged chamber 3 are sealed with a replaceable sealing material 12, but a part of the cooling air leaks from the sliding portion A. (Refer to "two-dot chain line toward the sliding portions A on both sides" in the figure), and when the sealing material 12 is worn, the air volume of the cooling air leaking to the outside increases.

During the movement of the trough trolley 1, powder-grain sintered ore (hereinafter sometimes referred to as “falling ore”) 10b falls from the bottom of the trough trolley 1 in a grid pattern, but the relatively heavy falling ore 10d is a chamber. It descends in 3, reaches the mine drop pipe 13 along the inclined wall 3b of the chamber 3, and is collected by the dust conveyor (not shown) in the dust conveyor casing 7.

On the other hand, the lightweight deposit 10c rides on the cooling air leaking from the sliding portion A of the chamber 3 fixedly arranged with the support member 11 and blows out to the outside of the sliding portion A, and the vertical wall 3a and the rail of the chamber 3 are blown out. It accumulates between 2 and also blows out from between the wheels 1a to the outside of the rail 2 and scatters. A great deal of cost and labor is required to recover the deposited mine and the scattered mine.

This also applies to a cooler having a linear cross-sectional structure similar to that shown in FIG. 2 and having a lower blow-in type.

Therefore, it is important to ensure airtightness in the sliding portion of the trough carriage and the chamber, and many techniques for ensuring the airtightness of the sliding portion have been proposed so far (for example, Patent Document 1). ~ 6, see).

For example, Patent Document 6 is a sealing device for a sintered ore cooler that cools a sintered ore in a moving cooling trough by blowing cooling gas into the cooling trough from an air chamber installed under the cooling trough. A flexible elastic plate-like body that is taller than the gap and longer in the moving direction of the cooling trough is interposed in the gap between the lower surface of the seal plate installed on the lower edge of the cooling trough and the upper edge of the air chamber. , The lower end of the flexible elastic plate is fixed to the air chamber side, and the cross section of the flexible elastic plate is curved so that the plate surface of the flexible elastic plate is attached to the lower surface of the seal plate. A sealing device for a sintered ore cooler has been proposed, which comprises using a plate-shaped rubber material containing magnet powder as a flexible elastic plate-like body at the time of abutting.

However, even if the sliding portion of the trough carriage and the chamber is sealed with a sealing material, the sealing material gradually wears, so that it is not possible to prevent the leakage of the cooling air from the sliding portion. It is difficult to prevent the blowout of falling ore on the cooling air for a long period of time.

After all, in the lower blow-in type cooler, regardless of the type, if it is attempted to reduce the amount of fallen ore blown out by the cooling air leaking from the sliding part of the trough carriage and the chamber, the sliding part It is necessary to frequently replace the sealing material that seals the chamber, and it costs a lot of money and labor to recover the fallen ore that has been blown out by the cooling air and accumulated and scattered on the outside of the sliding part. The current situation is that it is necessary.

JP-A-58-077537 Jitsukaisho 61-044199 Japanese Unexamined Patent Publication No. 62-242785 Jikkenhei 02-048796 Japanese Unexamined Patent Publication No. 08-247660 Japanese Unexamined Patent Publication No. 2009-066721

Therefore, in view of the above-mentioned current situation relating to the lower blow-in type sinter cooling machine, the present invention disperses the powdered sinter (falling ore) blown out from the trough trolley and scattered to the outside of the cooling machine system. A sinter cooling machine that solves the problem of accumulating without sinter, collecting it all at once without spending a lot of money and labor, and reusing the recovered sinter as a product sintered ore. It is an object of the present invention to provide a method for recovering granulated sinter.

In order to solve the above problems, it is necessary to consider measures against falling ore falling out of the system of the cooler by the cooling air leaking from the sliding portion of the trough carriage and the chamber. Since the sealing material that seals the sliding part of the trough trolley and the chamber gradually wears, it is long for the fallen ore to ride on the cooling air leaking from the sliding part and blow out to the outside of the sliding part. Based on the premise that it is difficult to deter over a period of time, we diligently examined methods to solve the above problems.

As a result, at the end of the rail floor of the rail on which the trough trolley moves, a plate-shaped member that blocks the cooling air leaking from the sliding portion of the trough trolley and the chamber is erected, and the end of the rail floor and the chamber are erected. By connecting the transport means at the lower end of the chamber with a metal plate, it is possible to suppress the scattering of the fallen ore blown out by the cooling air from the sliding portion, and the fallen ore deposited on the rail floor inside the plate-shaped member can be prevented. It was found that it can be recovered efficiently and easily without spending a lot of money and labor together with the falling ore that descends in the chamber and accumulates in the above-mentioned transport means.

The present invention has been made based on the above findings, and the gist thereof is as follows.

(1) Multiple trough trolleys that move from the sinter inlet to the discharge section on the rail in a connected state, and cooling air is blown into the sinter on the moving trough trolley that is placed at the bottom of the rail. , A chamber connected by a blower pipe, a sealing means that is replaceably attached to the upper end of the chamber to seal the sliding part of the trough trolley and the chamber, and a sealing means attached to the lower end of the chamber, from the trough trolley to the chamber. In a sinter cooling machine provided with a transport means for transporting powdered sinter that falls and accumulates inside.
An inclined plate is provided along the inclined wall of the chamber between the end of the rail floor of the rail and the transport means.
At the end of the rail floor or in the vicinity of the end, a scattering prevention plate that suppresses the scattering of the powdered sintered ore blown out by the cooling air leaking from the sliding portion is erected close to the trough carriage. Being done
The rail floor is provided with a recovery hole for the powder or granular material sintered ore that collides with the scattering prevention plate and accumulates on the rail floor and the powder or granular material sintered ore that collides with the rail and accumulates on the rail floor. Sintered ore cooler characterized by being

(2) The sinter cooling machine according to (1) above, wherein the shatterproof plate is erected separately for each sliding portion from which powdered sinter is blown out.

(3) The sinter cooler according to (1) or (2) above, wherein the shape of the tip of the shatterproof plate is curved or bent toward a trough carriage.

(4) Any of the above (1) to (3), wherein the upper portion of the trough carriage is covered with a hood cover provided with an exhaust stack for exhausting the cooling exhaust air that has passed through the sinter. The sinter cooler described.

(5) Sintered ore is sequentially charged from the sinter input port to a plurality of trough trolleys that move from the sinter input port to the sinter discharge section on the rail in a connected state, and is placed on the lower part of the rail. Cooling air is blown into the sinter on the moving trough sinter from a chamber having a sealing means at the upper end to seal the sliding part of the trough trolley and the chamber, which are connected and arranged by a blower pipe, and sintered. This is a recovery method for recovering the powdery sinter that falls from the trough trolley into the chamber when the ore is cooled and the powdery sinter that is blown out by the cooling air leaking from the sliding portion.
Inclined along the sloping wall of the chamber between the end of the rail floor of the rail and the transport means attached to the lower end of the chamber to collect and transport the powder sinter that falls from the trough trolley into the chamber. Provide a board,
At the end of the rail floor or in the vicinity of the end, a scattering prevention plate that suppresses the scattering of the sinter of powder particles blown out by the cooling air leaking from the sliding portion is erected in the vicinity of the trough carriage. And
The rail floor is provided with recovery holes for the powder-granular sinter that collides with the shatterproof plate and accumulates on the rail floor and the powder-grain sinter that collides with the rail and accumulates on the rail floor.
The powder or granular material sinter that falls from the recovery hole is accumulated in the transport means attached to the lower end of the chamber by the inclined plate, and is dropped from the trough trolley into the chamber and collected in the transport means. A method for recovering powder or granular sinter, which comprises recovering the sinter together with the sinter.

(6) The method for recovering powdered sinter according to (5) above, wherein the transporting means includes a belt conveyor.

According to the present invention, the powder-grain sinter (falling ore) that blows out to the outside of the sliding portion on the cooling air leaking from the sliding portion of the trough carriage and the chamber is accumulated without being scattered, and a large amount is accumulated. Since it can be recovered efficiently and easily without spending a lot of money and labor, it is possible to increase the utilization rate of sintering powder (falling ore) and greatly improve the working environment around the cooler. be able to.

It is a figure which shows one aspect of the lower blowing type cooling machine in the ring type. It is a figure which shows the AB cross-sectional structure of the cooler shown in FIG. It is a figure which shows the cross-sectional structure of the sinter cooling machine of this invention.

The sinter cooler of the present invention (hereinafter sometimes referred to as "cooler of the present invention") is
Multiple trough trolleys that move from the sinter inlet to the scavenging chamber on the rail in a connected state, and a blower pipe that blows cooling air into the sinter on the moving trough trolley that is placed at the bottom of the rail. A chamber connected by, a sealing means that is replaceably attached to the upper end of the chamber and seals the sliding part of the trough trolley and the chamber, and a sealing means that is attached to the lower end of the chamber and falls from the trough trolley into the chamber. In a sinter cooling machine provided with a transport means for transporting the sinter that accumulates in the sinter.
An inclined plate is provided along the inclined wall of the chamber between the end of the rail floor of the rail and the transport means.
At the end of the rail floor or in the vicinity of the end, a scattering prevention plate that suppresses the scattering of the powdered sintered ore blown out by the cooling air leaking from the sliding portion is erected close to the trough carriage. Being done
The rail floor is provided with recovery holes for the powder-grained sintered ore that collides with the shatterproof plate and accumulates on the rail floor and the powder-grained sintered ore that collides with the rail and accumulates on the rail floor. It is characterized by being.

The method for recovering powdered sinter of the present invention (hereinafter, may be referred to as “the method for recovering the present invention”) is
Sintered ore is sequentially charged from the sinter input port to multiple trough trolleys that move from the sinter input port to the sinter discharge section on the rail in a connected state, and a blower pipe is used at the bottom of the rail. Cooling the sinter is cooled by blowing cooling air into the sinter on the moving sinter from a chamber at the upper end that has a sealing means at the upper end that is connected and arranged to seal the sliding part of the trough trolley and the chamber. This is a recovery method for recovering the powdery sinter that falls from the trough trolley into the chamber and the powdery sinter that blows out on the cooling air leaking from the sliding portion.
Inclined along the sloping wall of the chamber between the end of the rail floor of the rail and the transport means attached to the lower end of the chamber to collect and transport the powder sinter that falls from the trough trolley into the chamber. Provide a board,
At the end of the rail floor or in the vicinity of the end, a scattering prevention plate that suppresses the scattering of the sinter of powder particles blown out by the cooling air leaking from the sliding portion is erected in the vicinity of the trough carriage. And
The rail floor is provided with recovery holes for the powder-granular sinter that collides with the shatterproof plate and accumulates on the rail floor and the powder-grain sinter that collides with the rail and accumulates on the rail floor.
The powder sinter that falls from the recovery hole is accumulated in the transport means attached to the lower end of the chamber with the inclined plate, and the powder particles that fall from the trough carriage into the chamber and accumulate in the transport means. It is characterized by being recovered together with the sinter.

Hereinafter, the chiller of the present invention and the recovery method of the present invention will be described with reference to the drawings.

FIG. 3 shows the cross-sectional structure of the sinter cooler of the present invention. The cooler of the present invention and the recovery method of the present invention are mainly suitable for cooling the sinter obtained by the DL type sinter, but the sinter is the sinter obtained by the DL type sinter. It is also applicable to cooling sinters sintered by other sinters.

The cross-sectional structure shown in FIG. 3 is basically based on the cross-sectional structure shown in FIG. 2 (A-B cross-sectional structure of the cooler shown in FIG. 1), and includes the constituent members / parts shown in FIG. The same components / parts are designated by the same reference numerals or numbers as those shown in FIG. 2, but the cross-sectional structure shown in FIG. 3 is also a cross-sectional structure common to lower blow-in type coolers. The following description relates to the cross-sectional structure of the lower blow-in type cooler regardless of the model.

In the cross-sectional structure shown in FIG. 3, the cooling air leaking from the sliding portion A of the trough carriage 1 and the chamber 3 to the outer rail floor 14 of the rail 2 on which the trough carriage 1 moves (“sliding portions on both sides” in the drawing. A scattering prevention plate 15 that blocks the two-dot chain line toward A) and suppresses the scattering of fallen ore that blows out from the sliding portion on the cooling air is erected in the vicinity of the trough carriage 1.

The point that the shatterproof plate 15 is erected close to the trough carriage 1 is substantially different from the conventional cooler (see FIG. 2), and is a feature of the cooler of the present invention and the recovery method of the present invention. It is one.

The shatterproof plate 15 may be erected over the entire circumference of the sliding portion A of the trough carriage 1 and the chamber 3, or may be erected separately for each sliding portion where the falling ore is blown out.

A part of the falling ore 10c that blows out to the outside of the sliding portion A on the cooling air leaking from the supporting member 11 of the trough carriage 1 and the sliding portion A of the chamber 3 collides with the rail 2 and collides with the rail 2 to form the chamber 3. The ore fall 10c that accumulates between the vertical wall 3a and the rail 2 and blows out from between the wheels 1a to the outside of the rail 2 collides with the scattering prevention plate 15 and between the rail 2 and the scattering prevention plate 14. Accumulate.

Since the rail floor 14 is provided with a recovery hole 14a for recovering the deposited ore fall 10c, the ore fall 10c accumulated on the rail floor 14 falls from the recovery hole 14a.

A dust conveyor casing 7 (conveyor means) provided with a dust conveyor (not shown) is attached to the lower end of the chamber 3, and the chamber 3 is inclined between the end of the rail floor 14 and the dust conveyor casing 7. Since the metal inclined plate 16 is attached along the wall 3a, the fallen ore 10c that has fallen from the recovery hole 14a of the rail floor 14 descends along the inclined plate 16 and dust in the dust conveyor casing 7. Accumulate on the conveyor.

While the trough trolley 1 is moving, it is relatively heavy in the falling ore 10b falling from the grid-like bottom of the trough trolley 1, and is cooled by the cooling air leaking from the sliding portion A of the trough trolley 1 and the chamber 3. The mine drop 10d that does not blow out of the machine system descends in the chamber 3, reaches the mine drop pipe 13 along the inclined wall 3b of the chamber 3, passes through the mine drop pipe 13, and enters the dust conveyor casing 7. Accumulate on the dust conveyor.

As described above, in the cooler of the present invention and the recovery method of the present invention, while the trough trolley 1 is moving, the mine fallen 10b (the mine fallen 10c blown out of the chamber and the inside of the chamber 3) falls from the grid-like bottom of the trough trolley 1. The falling mine 10d) can be accumulated by a conveyor belt arranged at the lower end of the chamber 3, and the falling mine 10d can be collectively collected without being scattered outside the system of the cooler. This point is also a feature of the cooler of the present invention and the recovery method of the present invention.

Therefore, according to the cooler of the present invention and the recovery method of the present invention, the fallen mine 10b can be recovered efficiently and easily without requiring a large amount of cost and labor, and the working environment around the cooler can be used. Can be greatly improved.

FIG. 3 shows a mode in which the shatterproof plate 15 is erected vertically on the end of the rail floor 14, but the shatterproof plate 15 is cooled to leak from the sliding portion A of the trough carriage 1 and the chamber 3. It is not limited to a specific erection mode and shape as long as it has a function of blocking wind. For example, the shatterproof plate 15 may be erected near the end of the rail floor 14, or may be erected diagonally with respect to the trough trolley 1, or the tip thereof may be erected with respect to the trough trolley 1. It may have a curved or bent shape.

Further, although the shatterproof plate 15 is usually a metal plate, it is preferably a lightweight one that can be easily removed by one worker, and the standing mode and shape are adjusted so as not to interfere with the maintenance and inspection of the cooler. design.

Next, an example of the present invention will be described. The conditions in the examples are one condition example adopted for confirming the feasibility and effect of the present invention, and the present invention is described in this one condition example. It is not limited. The present invention can adopt various conditions as long as the gist of the present invention is not deviated and the object of the present invention is achieved.

(Example 1)
Conventionally, about 120 tons / month of ore fall occurred, and a great deal of cost and labor was required for the treatment. However, since the sintered ore was cooled by the ring-shaped cooler having the cross-sectional structure shown in FIG. , 120t / month of sinter was easily recovered without much cost and labor. Further, out of 120 tons / month, about 60 tons / month could be recovered as a product sinter having a sieve of 5 mm or more, so that the utilization rate of falling ore was improved.

As described above, according to the present invention, the powder-grain sinter (falling ore) that blows out to the outside of the sliding portion on the cooling air leaking from the sliding portion of the trough carriage and the chamber is not scattered. Since it can be collected efficiently and easily without spending a lot of money and labor, the utilization rate of sinter powder (falling ore) is increased and the working environment around the cooler is greatly expanded. Can be improved. Therefore, the present invention has high utility in the steel industry.

1 Traf trolley 1a Wheels 2 Rails 3 Chambers 3a Vertical walls 3b Inclined walls 4 Blowers 5 Exhaust pipes 6 Hood covers 7 Dust conveyor casings 8 Sintering ore inlet 9 Sintering parts 10 Sintering machines 10a Sintered ore 10b, 10c, 10d ore fall (powdered sintered ore)
11 Support member 12 Sealing material 13 Falling ore drop pipe 14 Rail floor 14a Recovery hole 15 Scattering prevention plate 16 Inclined plate A Sliding part

Claims (6)

Multiple trough trolleys that move from the sinter inlet to the scavenging chamber on the rail in a connected state, and a blower pipe that blows cooling air into the sinter on the moving trough trolley that is placed at the bottom of the rail. A chamber connected by, a sealing means that is replaceably attached to the upper end of the chamber and seals the sliding part of the trough trolley and the chamber, and a sealing means that is attached to the lower end of the chamber and falls from the trough trolley into the chamber. In a sinter cooling machine provided with a transport means for transporting the sinter that accumulates in the sinter.
An inclined plate is provided along the inclined wall of the chamber between the end of the rail floor of the rail and the conveying means.
At the end of the rail floor or in the vicinity of the end, a scattering prevention plate that suppresses the scattering of the powdered sintered ore blown out by the cooling air leaking from the sliding portion is erected close to the trough carriage. Being done
The rail floor is provided with a recovery hole for the powder or granular material sintered ore that collides with the scattering prevention plate and accumulates on the rail floor and the powder or granular material sintered ore that collides with the rail and accumulates on the rail floor. Sintered ore cooler characterized by being The sinter cooling machine according to claim 1, wherein the shatterproof plate is erected separately for each sliding portion from which the powder-grained sinter is blown out. The sinter cooler according to claim 1 or 2, wherein the shape of the tip of the shatterproof plate is curved or bent toward a trough carriage. The sintering according to any one of claims 1 to 3, wherein the upper portion of the trough trolley is covered with a hood cover provided with an exhaust stack for exhausting the cooling exhaust air that has passed through the sinter. Mine cooler. Sintered ore is sequentially charged from the sinter input port to multiple trough trolleys that move from the sinter input port to the sinter discharge section on the rail in a connected state, and connected to the lower part of the rail with a blower pipe. The sinter is cooled by blowing cooling air into the sinter on the moving sinter from the chamber at the upper end, which has a sealing means for sealing the sliding portion of the trough trolley and the chamber. This is a recovery method for recovering the powdery sinter that falls from the trough trolley into the chamber and the powdery sinter that blows out on the cooling air leaking from the sliding portion.
Inclined along the sloping wall of the chamber between the end of the rail floor of the rail and the transport means attached to the lower end of the chamber to collect and transport the powder sinter that falls from the trough trolley into the chamber. Provide a board,
At the end of the rail floor or in the vicinity of the end, a scattering prevention plate that suppresses the scattering of the sinter of powder particles blown out by the cooling air leaking from the sliding portion is erected in the vicinity of the trough carriage. And
The rail floor is provided with recovery holes for the powder-granular sinter that collides with the shatterproof plate and accumulates on the rail floor and the powder-grain sinter that collides with the rail and accumulates on the rail floor.
The powder or granular material sinter that falls from the recovery hole is accumulated in the transport means attached to the lower end of the chamber by the inclined plate, and is dropped from the trough trolley into the chamber and collected in the transport means. A method for recovering powdered ore, which is characterized by recovering together with sinter. The method for recovering powdered sinter according to claim 5, wherein the transporting means includes a belt conveyor.

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