JP3089437B2 - Raw material holding damper through which waste gas can pass - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a melting furnace in which a raw material falling from above the preheating tower is received and held in a preheating tower erected in the melting furnace, and the raw material holding damper is closed. The present invention relates to a raw material holding damper through which a waste gas from a fuel cell can pass upward through a damper, and a waste gas that preheats and equalizes the raw material held by the damper equally to a high temperature can pass therethrough.

[0002]

2. Description of the Related Art The present applicant has developed various kinds of melting furnaces, and has filed a patent application as disclosed in Japanese Patent Application No. 3-100375, for example.

[0003] The invention according to this patent application comprises a melting furnace having a material inlet at the top, a canopy covering the material inlet of the melting furnace, and an appropriate number of preheating towers standing on the canopy. The preheating tower is formed in a cylindrical shape and communicates with the canopy so as to allow waste gas from the melting furnace to pass upward, and an appropriate number of preheating chambers upward from below. In the upper part of the preheating tower, an exhaust duct for exhausting waste gas is attached, and at the uppermost end of the preheating tower, a raw material storage chamber for appropriately charging and storing the raw material to be dissolved from the outside is provided. The preheating chambers include a first preheating chamber and a second preheating chamber in order from a lower preheating chamber.
An openable / closable raw material holding damper is provided at a lower portion, and the raw material holding damper of each preheating chamber and the raw material charging / closing door of the raw material storage chamber are controlled so as to be appropriately opened and closed.

In the use of a melting furnace having a raw material preheating tower utilizing waste gas according to the present invention, first, a raw material such as iron shavings is charged into a melting furnace from a raw material charging port to be melted. At that time, the raw material holding dampers are sequentially turned upward to the first preheating chamber and the second preheating chamber of the preheating tower communicating from the canopy so as to allow the waste gas from the melting furnace to pass upward in a cylindrical shape, Then, the material input opening / closing door is opened and closed, and the material is held in the respective preheating chambers from the material retaining chamber.

[0005] The waste gas sent from the melting furnace passes through each preheating chamber through the gap between each raw material holding damper and is discharged from the exhaust duct, and the raw material held in each preheating chamber is discharged by passing the waste gas. Preheat. Since the waste gas passing through the first preheating chamber closest to the melting furnace has the highest heat, the raw material held in the first preheating chamber is preheated to a high temperature. Further, the waste gas that has passed through the first preheating chamber is deprived of heat to some extent, and then passes through the second preheating chamber to preheat the raw material held therein to a certain high temperature. This is sequentially performed in each preheating chamber, and the temperature of the waste gas becomes lower as it goes to the preheating chamber located above, so that the temperature of the raw material preheated in the preheating chamber becomes lower as it goes upward. .

The opening / closing of the material holding dampers in each preheating chamber and the opening / closing control of the material charging / closing door of the material storage chamber are performed as follows, for example. That is, since the preheating chamber for directly charging the raw material into the melting furnace is the first preheating chamber, when the raw material holding damper of the first preheating chamber is opened and the raw material held in the first preheating chamber is charged into the melting furnace, The raw material holding damper of the second preheating chamber is closed, and when the raw material holding damper of the first preheating chamber is closed, the raw material holding damper of the second preheating chamber is opened and the second raw material holding damper is opened.
When the raw material in the preheating chamber is charged into the first preheating chamber, this operation is sequentially performed upward in each preheating chamber, and the raw material charging / closing door of the last raw material storage chamber is similarly operated. When the raw material is charged into the melting furnace, the raw material in the preheating chamber above the second preheating chamber is not charged into the first preheating chamber.

When the raw material holding damper in the first preheating chamber is closed after the raw material in the first preheating chamber is charged, the raw material holding damper in the second preheating chamber is opened and the raw material preheated to a certain extent in the second preheating chamber is first heated. It is thrown into the room. This is performed sequentially toward the preheating chamber located above.

As a result, since the raw material supplied from the second preheating chamber to the first preheating chamber has been preheated to a certain extent, the preheating in the first preheating chamber is based on the fact that the raw material left as it is in the atmosphere is removed from the beginning. This can be performed in a much shorter time than preheating in one preheating chamber.

[0009]

However, in the conventional preheating tower, since the raw material holding damper is formed in a substantially triangular prism shape, when the pair of raw material holding dampers is closed, the waste gas from the melting furnace rises upward. The part that passes through
There was only a gap between the facing raw material holding dampers.

Accordingly, the raw material held in the vicinity of the gap between the pair of raw material holding dampers is sufficiently heated by the waste gas from the melting furnace and becomes high temperature, whereas the raw material held in a position distant from the vicinity of the gap between the damper and the damper. The amount of waste gas was too small to reach a high temperature due to the amount of waste gas, and the raw materials could not be preheated and soaked equally in each preheating chamber.

Therefore, when the raw material is put into the melting furnace, the raw material held near the gap of the damper and preheated to a high temperature melts quickly, while the raw material held at a position distant from the vicinity of the gap of the damper is melted. It took a long time, and it was not possible to quickly melt a large amount of raw materials put into the melting furnace.

In view of the above, the present invention is directed to a preheating tower installed in a melting furnace, which receives and holds the raw material falling from above the preheating tower, and, in a state where the raw material holding damper is closed, transfers the raw material from the melting furnace. It is an object of the present invention to provide a raw material holding damper that allows waste gas to pass upward through a damper and allows the waste gas that preheats and equalizes the raw material held by the damper to be equally high in temperature.

[0013]

According to the present invention, there is provided a cylindrical furnace having a raw material charging port provided at an upper portion thereof, standing in a melting furnace covered by a canopy, and having an appropriate number of preheating chambers provided from the lower side to the upper side. In the preheating tower, a pair of material holding dampers that are attached to the lower part of each preheating chamber to be openable and closable to hold the material, and that the waste gas from the melting furnace can pass upward with the material holding damper closed. In order to achieve this, a pair of raw material holding dampers are mounted in the preheating tower so as to have a gap, and the raw material holding dampers have a substantially fan-shaped columnar cross section and are formed by providing slits. Is to solve.

[0014]

According to the present invention, waste gas from a melting furnace passes upward from a gap between a pair of raw material holding dampers openably and closably mounted in a preheating tower, and the raw material held by the raw material holding damper is preheated to a high temperature. I do.

Further, the waste gas from the melting furnace passes upward from the slit of the raw material holding damper, and preheats and uniformly heats the raw material held by the raw material holding damper to a high temperature.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a raw material holding damper 14 according to the present invention,
The entire raw material preheating tower to which the waste gas 15 is attached using waste gas will be described with reference to FIG.

Reference numeral 1 shown in the figure denotes a melting furnace having a raw material inlet 2 at an upper portion, and has a canopy 2 for covering the raw material inlet 2 of the melting furnace 1. On the canopy 3 of the melting furnace 1, an appropriate number of, in the case shown, two preheating towers 4 are erected.

The melting furnace 1 has a melting furnace main body 5 of a type in which a hollow cylinder is placed horizontally, and the melting furnace main body 5 has a tap hole 6 and a slag removing port 7 formed on a peripheral side surface thereof. An electrode 8 is disposed in the center of the melting furnace main body 5 from above in a manner suspended from above.

Further, the melting furnace body 5 is provided on both peripheral surfaces thereof.
A base gear 9 is provided, and a portion of the base gear 9 is meshed and supported by five drive gears 10 in the illustrated case. The body 5 itself pivots, so that, for example,
It can be tilted without moving the center of gravity when tapping.

Further, auxiliary working ports are provided at both end portions of the melting furnace main body 5 so that the raw material S1 charged into the inside or from above is pushed in so as to approach the electrode 8 as appropriate. It is formed so that an operation of leveling the raw material S1 put therein can be performed.

Further, as described above, the canopy 3 is covered so as to cover the raw material charging port 2, and the canopy 3 is supported by the canopy support, and is provided between the canopy 3 and the melting furnace main body 5. Has a slight gap, and this gap, for example, although not shown, forms a sealing structure by arranging a sealing member such as a banner, and the melting structure of the melting furnace 1 by this sealing structure.
It controls the combustion of gas generated inside.

On the other hand, the preheating tower 4 has a cylindrical shape, which is slightly expanded downward to improve the flow of the raw materials, and
In order to allow the waste gas from the tank to pass upward, it is fitted so as to communicate with the canopy 3, and an appropriate number of preheating chambers 3b and 3d are provided upward from below.

The specific structure is such that a first preheating tower 4a and a second preheating tower 4c are respectively fitted and arranged in the upward direction, and a preheating tower head 11 is continuously provided on the upper part thereof.
An exhaust duct is connected to the preheating tower head 11 via a connecting flange, and is configured to exhaust waste gas from the melting furnace 1 through an exhaust port 12.

A raw material storage chamber 13 is formed continuously above the head 11 of the preheating tower.
Thus, a first preheating chamber 4b is formed by the second preheating tower 4c, and a second preheating chamber 4d is formed by the second preheating tower 4c. A raw material storage chamber 13 is formed thereon, and the first preheating chamber 4b and the second preheating chamber are directed upward. 4d,... Are sequentially formed.

In the first preheating chamber 4b, a raw material holding damper 14, which is formed in a column shape with a substantially fan-shaped side section, is pivotally supported in a pivotal manner with its essential part pivoted to open the first preheating chamber 4b. The raw material holding dampers 14 are arranged so as to have a slight gap even when they are closed, so that waste gas can pass through the gap.

This structure is the same as that of the second preheating chamber 4d, and is rotatably supported like the raw material holding damper 14 so that the lower part of the second preheating chamber 4d can be opened and closed.

The material holding damper 14 of the first preheating chamber 4b, the material holding damper 15 of the second preheating chamber 4d, and the material input / output door 16 of the material storage chamber 13 are controlled as follows. That is, when the raw material holding damper 14 of the first preheating chamber 4b is opened and the raw material S1 held in the first preheating chamber 4d is put into the melting furnace 1, the raw material holding damper 15 of the second preheating chamber 4d is closed. When the raw material holding damper 14 of the first preheating chamber 4b is closed, the raw material holding damper 15 of the second preheating chamber 4d is opened, and the raw material of the second preheating chamber 4d is supplied to the first preheating chamber 4b.
b, and the operation is sequentially turned upward in each preheating chamber 4.
Steps a and d are performed, and the material supply opening / closing door 16 of the last material storage chamber 13 is opened with the material holding damper 15 closed.

By doing so, after the raw material S1 is charged into the melting furnace 1, the raw material holding damper 14 is closed (moves) into the second when the raw material holding damper 14 is closed, and the raw material is charged when the second preheating chamber 4d is closed. The opening / closing door 16 is opened, and the raw material S3 in the raw material storage chamber 13 moves to the second preheating chamber 4d.

Next, the raw material holding dampers 14, 15 through which the waste gas can pass will be described.

The raw material holding dampers 14, 15 are shown in FIG.
As shown in FIG. 5, the side cross section is substantially a fan-shaped column, and three slits A are provided. Specifically, a substantially fan-shaped raw material holder 20 is provided on a square base 21 having a predetermined thickness so as to have a slight gap. The raw material holding body 20 and the base 21 which are constituent elements of the raw material holding dampers 14 and 15 are used for pouring a constituent material into a predetermined mold and mounting the raw material holding dampers 14 and 15 in the preheating tower 4 so as to be openable and closable. Together with the rotating part 26, it is integrally formed.
The number of the raw material holders 20 and the slits A are not limited to those shown in FIG.
1, the amount is appropriately increased or decreased according to the size and amount of S2. Further, the raw material holding body 20 is not limited to a substantially fan-shaped one, and may have any shape as long as the waste gas from the melting furnace 1 can pass upward while holding the raw materials S1 and S2. No problem.

The raw material holding dampers 14 and 15 having a substantially fan-shaped columnar cross section and provided with three slits A are formed on the entire surface except for the parts that come into contact with the raw materials S1 and S2 in order to minimize cooling loss. Apply heat insulation treatment. This insulation process
A plurality of bolts are fixed to the entire raw material holding dampers 14 and 15 (for example, stud bolts), and a heat insulating material is sprayed so as to cover the entire head portion of the bolts.
A heat-insulating layer is formed on the entirety of No.15. Further, as shown in FIG. 1, a cooling pipe 22 is incorporated in the raw material holding bodies 20 of the raw material holding dampers 14 and 15 to improve heat resistance.

On the other hand, outside the preheating tower 4, as shown in FIG. 2, with the raw material holding dampers 14, 15 open, air entering the slits A to prevent the air from entering the preheating tower 4 vigorously. The prevention plate 23 is attached. As shown in FIG. 2, the air entry prevention plate 23 is
And has a structure that abuts each slit A and closes the gap exactly. Further, the air entry prevention plate 23 shown in FIG.
In order to cover all the slits A existing in the first and second slits A, a base portion is connected to one hanging plate 24.

As shown in FIG. 2, the vertical plate 24 of the air entry preventing plate 23 is held by a holder 25 fixed outside the preheating tower 4 so as to be movable in the vertical direction. The hanging plate 24 is connected to a moving mechanism using an air cylinder or the like (not shown).
Is going up and down. Incidentally, one air entry prevention plate 23 may be independently held by the holding body 25 and individually movable in the vertical direction.

Further, the air entry preventing plate 23 may be a single rectangular plate extending linearly. Air entry prevention plate 2
When 3 is a rectangular plate, the raw material holding damper 14,
When the base 15 is located outside the preheating tower 4 with the opening 15, the air entry prevention plate 23 is moved upward so as to enter each slit A. In this way, by making the air entry prevention plate 23 a rectangular plate, it is possible to prevent the air from vigorously entering the preheating tower 4 from each slit A, and to reduce iron scraps such as debris of the raw materials S1 and S2 into the preheating tower. 4 can be reliably prevented from scattering from the inside to the outside.

The use of the present invention will be described below.

First, as shown by the alternate long and short dash line in FIG. 3, with the raw material holding dampers 14 and 15 closed in the preheating chambers 4b and 4d, the raw materials S1 and S2 are separated by the raw material holding bodies 20 of the dampers 14 and 15. The raw materials S1 and S2 are preheated to a high temperature by holding and holding the waste gas sent from the melting furnace 1. After sufficiently heating the raw materials S1 and S2, as shown by the solid line in FIG. 3, the raw material holding dampers 14 and 15 are opened at an angle of about 90 degrees, and the raw materials S1 and S2 are dropped. At this time, as shown by the solid line in FIG. 3, the air entry prevention plate 23 comes into contact with each slit A to close the gap exactly,
Prevent the air from vigorously entering the preheating tower 4.

Further, the raw materials S1, S2
Is attached, the raw material holding dampers 14, 15 are opened at an angle of about 90 degrees or more, as shown by the two-dot chain line in FIG. Then, as shown by the two-dot chain line in FIG. 3, the air entry prevention plate 23 is moved downward, and then the raw materials S1 and S2 attached to each raw material holder 20 are removed using an oxygen burner or the like.

[0038]

According to the present invention constructed as described above, a raw material inlet 2 is provided at the upper part, and the melting furnace 1 which is covered with the canopy 3 is erected, and an appropriate number of preheating chambers 4b , 4
In the cylindrical preheating tower 4 in which the raw materials S1 and S2 are provided, they are openably and closably mounted below the respective preheating chambers 4b and 4d.
A pair of raw material holding dampers 14 and 15 for holding
In order to allow the waste gas from the melting furnace 1 to pass upward when the raw material holding dampers 14 and 15 are closed, a pair of raw material holding dampers 14 and 15 are mounted in the preheating tower 4 with a gap therebetween. , The raw material holding dampers 14, 1
5 has a column shape with a substantially fan-shaped side cross section and is formed with the slit A, so that the raw materials S1 and S2 held by the raw material holding dampers 14 and 15 can be equally preheated and soaked at a high temperature.

That is, in order to allow the waste gas from the melting furnace 1 to pass upward while the raw material holding dampers 14 and 15 are closed, the pair of raw material holding dampers 14 and 15 is provided with a gap so as to have a gap. 4, the raw material S held near the gap between the raw material holding dampers 14, 15
1, S2 fully satisfies the entire waste gas sent from the melting furnace 1 and is preheated to a high temperature.

The raw materials S1, S2 held at positions away from the vicinity of the gap between the raw material holding dampers 14, 15
Also, the waste gas passing through the slits A provided in the raw material holding dampers 14 and 15 satisfactorily hits the entire waste gas and is preheated to a high temperature.

Therefore, according to the present invention, the raw materials S1, S held by the raw material holding dampers 14, 15 in each preheating chamber.
2 can be equally preheated and soaked to a high temperature.

As a result, the raw materials S1, S preheated to a high temperature
Since 2 is put into the melting furnace 1, a large amount of the raw materials S1 and S2 can be melted in a very short time.

Further, the waste gas sent from the melting furnace 1 is effectively used, so that it is very economical.

In addition, the raw material holding damper 14 of the present invention,
15 has a column shape with a substantially fan-shaped side section and is formed by providing a slit A, and since its configuration is extremely simple, it is preferable for mass production and can provide products at low cost. To play.

[Brief description of the drawings]

FIG. 1 is a perspective view of a raw material holding damper.

FIG. 2 is a perspective view showing a raw material holding damper in an open state and an air entry prevention plate.

FIG. 3 is a cross-sectional view showing an open / close state of a raw material holding damper and a moving state of an air entry prevention plate.

FIG. 4 is a cross-sectional view of the entire raw material preheating tower using waste gas.

[Explanation of symbols]

S1 raw material S2 raw material 1 melting furnace 2 raw material input port 3 canopy 4 preheating tower 4a first preheating tower 4b first preheating chamber 4c second preheating tower 4d second preheating chamber 5 melting furnace main body 6 tapping port 7 electrode 8 electrode 9 Base gear 10 Drive gear 11 Preheating tower head 12 Exhaust port 13 Raw material storage chamber 14 Raw material holding damper 15 Raw material holding damper 16 Raw material input opening / closing door A slit 20 Raw material holding body 21 Base 22 Cooling pipe 23 Air entry prevention plate 24 Hanging plate 25 Holder 26 Rotating part

Claims (1)

(57) [Claims] In a cylindrical preheating tower having a raw material charging port provided at an upper portion thereof and standing upright in a melting furnace covered with a canopy, and an appropriate number of preheating chambers provided upward from below. A pair of raw material holding dampers that are attached to the lower part of the preheating chamber to be openable and closable and hold raw materials. A pair of raw material holding dampers are provided to allow waste gas from the melting furnace to pass upward when the raw material holding dampers are closed. A raw material holding damper through which waste gas can pass is characterized in that the damper is mounted in the preheating tower so as to have a gap, and the raw material holding damper has a substantially fan-shaped columnar cross section and is provided with a slit. .