JP6311663B2 - Deposit removal device - Google Patents

Description

  The present invention relates to an apparatus for removing deposits.

  2. Description of the Related Art Conventionally, there is a need for a technique for removing deposits deposited on a part of equipment. For example, in the iron making process, a technique for removing deposits deposited on the edge of the hot metal ladle is required.

  In general, the de-Si, de-P, and de-S treatments in the hot metal stage in the iron making process are reacted using lime (mainly CaO). Since lime is more powdery than lumpy, the reaction efficiency is higher than that of lump. In recent years, the method of spraying (projecting) powdered lime onto hot metal contained in a hot metal ladle together with a pumping gas is becoming widespread (for example, patent documents). 1).

  When projecting powdered lime, the powdered lime soars on the gas flow reflected by the hot metal surface. Most of the soared powdered lime is sucked into the dust collector, but part of it is deposited on the edge of the hot metal ladle. The lime deposited on the edge was transported to the next process without being removed, and dropped into the atmosphere by falling under its own weight when the pan was tilted such as hot metal transfer or charging the converter.

  Powdered lime is a valuable material that should react with hot metal originally, but what is deposited on the edge eventually scatters into the atmosphere, resulting in a decrease in lime yield (or input lime reaction efficiency).

  Part of the scattered powdered lime accumulates on the overhead crane, but quick lime generates heat when mixed with moisture, so when working on the crane, the entire body should not react with the sweat of the operator. There is a problem that it is necessary to cover with protective clothing and work efficiency is significantly reduced.

  Therefore, in the iron making process, it is required to remove deposits deposited on the edge of the hot metal ladle.

JP 2011-42845 A

  However, conventionally, a technique for efficiently removing deposits deposited on an object such as such an apparatus has not been proposed.

  The present invention has been made for such a problem, and an object of the present invention is to provide a removal apparatus that efficiently removes deposits deposited on an object such as an apparatus.

The present invention has the following features in order to achieve such an object.
[1] A purge nozzle header that ejects a purge gas to an object on which deposits are deposited,
While removing the deposit from one end to the other end of the target by blowing the purge gas from the purge nozzle header while relatively moving the target and the purge nozzle header, the deposit is removed by blowing away the deposit with the purge gas. A device,
The purge nozzle header is
It has a double tube structure including an inner cylinder having a slit and an outer cylinder having a slit having a shape different from that of the inner cylinder,
By rotating at least one of the inner cylinder and the outer cylinder, the slit of the inner cylinder and the slit of the outer cylinder move relatively, and the purge gas is ejected from the position where the slit of the inner cylinder and the slit of the outer cylinder coincide. Deposit removal device.
[2] One of the shape of the slit in the development view in which the inner cylinder is developed and the shape of the slit in the development view in which the outer cylinder is developed is formed in a shape corresponding to the shape of the portion where the deposit of the object is deposited. ,
The shape of the other slit is such that the length in the longitudinal direction of the purge nozzle header is equal to or longer than the length of the portion where the deposit of the object is deposited, and the length in the rotational direction of the inner cylinder or the outer cylinder is The deposit removing apparatus according to [1], wherein the slit is formed in a shape smaller than the length of the inner cylinder or the outer cylinder of one slit in the rotation direction.
[3] One of the shape of the slit in the development view in which the inner cylinder is developed and the shape of the slit in the development view in which the outer cylinder is developed is the shape of the portion where the deposit of the target object is accumulated. The deposit removing apparatus according to [1] or [2], wherein the deposit removing apparatus is formed in a shape compressed in a rotating direction.
[4] The object is a hot metal pan,
The slit of the inner cylinder is formed into a shape in which the shape of the edge of the hot metal ladle is compressed in the rotation direction of the inner cylinder,
The slit of the outer cylinder has a shape in which the length of the purge nozzle header in the longitudinal direction is substantially equal to the diameter of the edge of the hot metal pan, and the length of the inner cylinder in the rotational direction is smaller than the length of the inner cylinder in the rotational direction. The deposit removing apparatus according to any one of [1] to [3], which is formed on the substrate.
[5] The deposit removing apparatus according to any one of [1] to [4], further including a dust collecting hood disposed in the vicinity of the purge nozzle header and connected to the dust collector.

  According to the present invention, deposits deposited on an object such as an apparatus can be efficiently removed.

It is a figure which shows the example which installed the deposit removal apparatus which concerns on embodiment of this invention around the hot metal ladle. It is the figure which looked at the deposit removal apparatus which concerns on embodiment of this invention from the top. It is sectional drawing of the nozzle nozzle for purge of the deposit removal apparatus which concerns on embodiment of this invention. It is the figure which expanded the cross section of the nozzle header for purge of the deposit removal apparatus which concerns on embodiment of this invention. It is an expanded view of the inner cylinder and outer cylinder of the nozzle header for purge of the deposit removal apparatus which concerns on embodiment of this invention. It is a figure which shows operation | movement of the deposit removal apparatus which concerns on embodiment of this invention.

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

  In this description, the present invention is described by taking as an example an apparatus in which the present invention is applied as an apparatus for removing deposits (powder lime) deposited on the edge of a hot metal ladle.

  FIG. 1 is a view showing an example in which a deposit removing device according to an embodiment of the present invention is installed around a hot metal ladle, and FIG. 2 is a diagram illustrating the deposit removing device according to an embodiment of the present invention. It is the figure seen from. In the figure, the Z direction is the upward direction, the X direction is the traveling direction of the hot metal ladle, and the Y direction is the direction orthogonal to the X direction and the Z direction.

  The hot metal ladle 11 is installed in a freight car 12, and moves in the X direction on the rail 3 laid on the building 2 when the freight car 12 is pulled by the locomotive.

  The wall of the building 2 is provided with a purge nozzle header 4, a dust collection hood 5, and a dust collection duct 6 at a height slightly above the edge of the hot metal ladle 11. As shown in FIG. 2, the dust collection hood 5 has a length (Y direction) substantially the same as the diameter of the edge of the hot metal ladle 11 and is connected to the dust collection duct 6. A dust collector (not shown) is provided at the tip of the dust collection duct 6. Dust generated in the process of removing Si, removing P, and removing S in the hot metal ladle 11 passes through the dust collecting duct 6 connected to the dust collecting hood 5 when the hot metal ladle 11 moves on the rail 3. It is sucked and collected by the dust collector.

  FIG. 3 is a cross-sectional view of the purge nozzle header of the deposit removing apparatus according to the embodiment of the present invention. In the present invention, the purge nozzle header 4 is installed under the dust collection hood 5, the hot metal ladle 11 is pulled by the locomotive, and the hot metal ladle 11 is moved relative to the purge nozzle header 4 while purging. By blowing the purge gas from the nozzle header 4 to the edge of the hot metal ladle 11, the powdered lime deposited on the edge of the hot metal ladle 11 is sequentially blown from the front to the rear in the traveling direction of the hot metal ladle 11, and the blown powder lime is blown away. In addition, the air is sucked into the dust collection duct 6 through the dust collection hood 5.

  FIG. 4 is an enlarged view of a cross section of the purge nozzle header of the deposit removing apparatus according to the embodiment of the present invention.

  The purge nozzle header 4 has a double pipe structure including an inner cylinder 41 having a slit 41a and an outer cylinder 42 having a slit 42a. A purge gas (such as air) is supplied to the inner cylinder 41. The supply source of the purge gas may be a compressor or a utility pipe in the factory.

  In the purge nozzle header 4, when at least one of the inner cylinder 41 and the outer cylinder 42 rotates, the slit 41 a of the inner cylinder 41 and the slit 42 a of the outer cylinder 42 relatively move, and the slit 41 a of the inner cylinder 41. And the purge gas is ejected from the place where the slit 42a of the outer cylinder 42 coincides.

  In this example, the outer cylinder 42 is fixed, and the inner cylinder 41 is configured to rotate in the direction of the arrow by a rotation driving device (not shown) provided at the end opposite to the purge gas supply end. . However, any configuration may be used as long as the slit 41a formed in the inner cylinder 41 and the slit 42a formed in the outer cylinder 42 are configured to move relative to each other. Specifically, the inner cylinder 41 may be fixed and the outer cylinder 42 may be rotated, or both the inner cylinder 41 and the outer cylinder 42 may be rotated at different rotational speeds.

  In the example of FIG. 4, the purge gas is ejected obliquely downward, but the purge gas ejection direction can be set to an arbitrary angle.

  FIG. 5 is a development view of the inner cylinder and the outer cylinder of the purge nozzle header of the deposit removing apparatus according to the embodiment of the present invention.

The shape of the slit 41 a in the developed view in which the inner cylinder 41 is developed is formed in a shape corresponding to the shape of the edge of the hot metal ladle 11. In the example of FIG. 5, the shape of the slit 41 a is formed in a shape (the shape of an elliptical ring having a major axis in the Y direction) in which the shape of the edge of the hot metal ladle 11 is compressed in the rotation direction (AB direction) of the inner cylinder 41. Yes. The length L _I of the slit 41 a in the longitudinal direction of the purge nozzle header 4 is substantially equal to the diameter of the edge of the hot metal ladle 11. However, although the edge of the hot metal ladle 11 has an annular shape, the shape of the slit 41a is such that the inner side of the elliptical ring and the outer side of the elliptical ring are connected at a plurality of locations so that the inner part of the elliptical ring does not fall out. It has become.

  In the above description, the shape of the slit 41 a is described as being formed by compressing the shape of the edge of the hot metal ladle 11 in the rotation direction (AB direction) of the inner cylinder 41. The compression rate (extension rate) in the AB direction can be changed according to the ratio to the rotation speed, the diameter of the purge nozzle header 4, and the diameter of the edge of the hot metal ladle 11.

The shape of the slit 42a of the outer cylinder 42 is such that the length L _O in the longitudinal direction of the purge nozzle header 4 is equal to or longer than the length l (see FIG. 6) of the portion where the deposit is deposited. Yes. Specifically, in the shape of the slit 42 a of the outer cylinder 42, the length L _O in the longitudinal direction of the purge nozzle header 4 is substantially equal to the diameter of the edge of the hot metal ladle 11. The shape of the slits 42a of the outer cylinder 42 has a length _{D O} of the rotational direction of the inner cylinder 41 (AB direction) is formed smaller than the AB direction length _{D I} of the inner tube 41. In the example of FIG. 5, the shape of the slit 42 a of the outer cylinder 42 is formed as one rectangle, but the shape of the slit 42 a of the outer cylinder 42 is not limited to this and may be various shapes. it can.

  For example, the slit 42a of the outer cylinder 42 may be an ellipse having a length in the longitudinal direction of the purge nozzle header 4 approximately equal to the diameter of the edge of the hot metal ladle 11, or a length longer than that. The rectangular slits may be arranged in the longitudinal direction of the purge nozzle header 4. Further, the shape of the slit 42 a of the outer cylinder 42 may be arranged so as to be inclined with respect to the longitudinal direction of the purge nozzle header 4 instead of the rectangle as shown in FIG. 5.

  In contrast to the example of FIG. 5, a slit corresponding to the shape of the portion of the object on which the deposit is deposited may be formed in the outer cylinder 42, and a rectangular slit may be formed in the inner cylinder 41. .

  Next, the operation of the deposit removing apparatus configured as described above will be described.

  The freight car 12 with the hot metal ladle 11 is pulled by the locomotive, and the hot metal ladle 11 is passed under the dust collection hood 5 and under the purge nozzle header 4.

  When the edge of the hot metal ladle 11 begins to pass under the purge nozzle header 4, purge gas is supplied to the inner cylinder 41. And according to the advancing position of the hot metal ladle 11, the inner cylinder 41 having the slit 41a formed in a shape corresponding to the shape of the edge of the hot metal ladle 11 is rotated. By rotating the inner cylinder 41, the slit 41a of the inner cylinder 41 and the slit 42a of the outer cylinder 42 move relative to each other. By changing the place where the slit 41a of the inner cylinder 41 and the slit 42a of the outer cylinder 42 coincide with each other, the ejection position of the purge gas can be changed. This is shown in FIG.

  FIG. 6 shows the positional relationship between the region X where the slit 41 a of the inner cylinder 41 and the slit 42 a of the outer cylinder 42 coincide with the edge of the hot metal ladle 11. 4 and 5, the purge gas is ejected obliquely downward. However, in FIG. 6, for convenience of explanation, it is assumed that the purge gas ejects the purge gas vertically downward.

  In the state 1 where the edge of the hot metal ladle 11 begins to pass under the purge nozzle header 4, the region X where the slit 41 a of the inner cylinder 41 and the slit 42 a of the outer cylinder 42 coincide with the front of the edge of the hot metal ladle 11 in the traveling direction. And the purge gas is ejected from the region X to the front part of the edge of the hot metal ladle 11 in the traveling direction.

  In the state 2 in which the hot metal ladle 11 has advanced almost directly below the purge nozzle header 4, the region X coincides with the edge of the center of the hot metal ladle 11 in the direction of travel, and the edge of the hot metal ladle 11 in the central direction of travel of the hot metal pan 11 Purge gas is ejected to the part.

  And in the state 3 in which the edge of the hot metal ladle 11 finishes passing under the purge nozzle header 4, the region X coincides with the edge portion on the rear side in the traveling direction of the ladle 11, and the traveling direction of the hot metal ladle 11 from the region X Purge gas is ejected to the rear edge portion.

  Thus, the region X where the purge gas is jetted changes according to the traveling position of the hot metal ladle 11, and the deposit can be removed by jetting the purge gas only to the edge of the hot metal pan 11 or its peripheral part. . The deposit blown off by the purge gas is collected into the dust collection duct 6 through the dust collection hood 5.

  As described above, according to the present invention, the inner cylinder 41 and the outer cylinder 42 are provided with slits having different shapes, and at least one of the inner cylinder 41 and the outer cylinder 42 is rotated so that the slit 41a and the outer cylinder of the inner cylinder 41 are rotated. By relative movement of the slit 42 a of 42, the position at which the purge gas is ejected can be changed according to the position of the hot metal ladle 11. In addition, the rotational speed of the inner cylinder 41 or the outer cylinder 42 can be adjusted according to the advancing speed (advance position) of the hot metal ladle 11.

  Thereby, purge gas can be ejected only to a required place, and the deposit deposited on the edge of the hot metal ladle 11 can be efficiently removed. As a result, the amount of purge gas used can be reduced as compared with the case where the entire surface of the hot metal ladle 11 is purged. Moreover, a lime yield can be improved by reusing the powdered lime deposited on the edge.

  The present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the gist of the present invention.

  Further, in the above description, the purge gas is ejected from the fixed purge nozzle header 4 while moving the hot metal ladle 11. However, if the hot metal ladle 11 and the purge nozzle header 4 are relatively moved, the purge gas is discharged. The nozzle header 4 may be moved, or both the hot metal ladle 11 and the purge nozzle header 4 may be moved.

  Furthermore, in the above description, the present invention has been described with reference to an example in which the present invention is applied to an apparatus for removing deposits deposited on the edge of the hot metal ladle 11, but the present invention is not limited to this and is applicable to various objects. It can be used as an apparatus for removing deposited deposits.

2 Building 3 Rail 4 Purge nozzle header 41 Inner cylinder 41a Slit 42 Outer cylinder 42a Slit 5 Dust collection hood 6 Dust collection duct 11 Hot metal pan 12 Freight car

Claims (4)

A purge nozzle header that ejects a purge gas to an object on which deposits are deposited,
While removing the deposit from one end to the other end of the target by blowing the purge gas from the purge nozzle header while relatively moving the target and the purge nozzle header, the deposit is removed by blowing away the deposit with the purge gas. A device,
The purge nozzle header is
It has a double tube structure including an inner cylinder having a slit and an outer cylinder having a slit having a shape different from that of the inner cylinder,
By rotating at least one of the inner cylinder and the outer cylinder, the slit of the inner cylinder and the slit of the outer cylinder move relatively, and the purge gas is ejected from the position where the slit of the inner cylinder and the slit of the outer cylinder coincide. Like
The object is a hot metal pan,
The slit of the inner cylinder is formed into a shape in which the shape of the edge of the hot metal ladle is compressed in the rotation direction of the inner cylinder,
The slit of the outer cylinder has a shape in which the length of the purge nozzle header in the longitudinal direction is substantially equal to the diameter of the edge of the hot metal pan, and the length of the inner cylinder in the rotational direction is smaller than the length of the inner cylinder in the rotational direction. An apparatus for removing deposits formed on the surface. One of the shape of the slit in the development view in which the inner cylinder is developed and the shape of the slit in the development view in which the outer cylinder is developed is formed in a shape corresponding to the shape of the portion where the deposit of the object is deposited,
The shape of the other slit is such that the length in the longitudinal direction of the purge nozzle header is equal to or longer than the length of the portion where the deposit of the object is deposited, and the length in the rotational direction of the inner cylinder or the outer cylinder is The deposit removing apparatus according to claim 1, wherein the slit removing device is formed in a shape smaller than the length of one slit in the rotation direction of the inner cylinder or the outer cylinder.   One of the shape of the slit in the development view in which the inner cylinder is developed and the shape of the slit in the development view in which the outer cylinder is developed is such that the shape of the portion where the deposit of the target object is accumulated in the rotation direction of the inner cylinder or the outer cylinder. The deposit removing apparatus according to claim 1 or 2, wherein the deposit removing apparatus is formed in a compressed shape. The deposit removing apparatus according to any one of claims 1 to 3 , further comprising a dust collection hood disposed in the vicinity of the purge nozzle header and connected to a dust collector.

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