JP2015044178A - Kneaded object spray nozzle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a kneaded object spray nozzle which can uniformly knead powder and liquid.SOLUTION: A kneaded object spray nozzle 100 includes a pipe 10 and a head 34. The pipe 10 includes: an upstream part 12 which partitions a hollow in which powder passes; a kneading part 14 which is positioned adjacent to the upstream part, has a plurality of holes on a peripheral wall, and partitions the hollow for kneading the powder and the liquid introduced from the plurality of holes; and a downstream part 16 which is positioned adjacent to the kneading part and partitions the hollow in which a kneaded object passes. The head 34 is connected to the downstream part of the pipe and sprays the kneaded object. The plurality of holes are arranged by dividing into a plurality of groups respectively in a plurality of height positions H, Halong an extending direction of the kneading part. The plurality of holes 20, 22 in the adjacent height positions are arranged in positions shifted when viewed from the extending direction.

Description

  The present invention provides a kneaded product spray that can be used when spraying a spray material on an RH dip tube, for example, to protect the RH (Ruhrstahl-Heraeus) dip tube used in the secondary refining process. It relates to the attachment nozzle.

  In vacuum degassing equipment such as RH (Ruhrstahl-Heraus) used in secondary refining, the molten steel in the ladle is sucked up and degassed to the vacuum degassing equipment, and the dip tube is used to return the treated molten steel to the ladle. Is used. This dip tube is generally referred to as an “RH dip tube”. Since at least the tip of the RH dip tube is immersed in the molten steel, the RH dip tube is damaged by the action of the molten steel flow or slag. Therefore, the spraying material (kneaded material) kneaded with the refractory material of irregular shape and water is periodically sprayed inside and outside the RH dip tube to reinforce and protect the RH dip tube refractory. (See FIG. 6, details will be described later).

  Therefore, a kneaded material spray nozzle is required for kneading the amorphous refractory powder and water, which is liquid, and discharging the kneaded material. Patent Document 1 discloses a kneaded material spray nozzle that can be applied to such applications. Patent Document 1 includes a powder passage, a kneading passage continuing to the passage and leading to a nozzle tip, and an additive liquid passage leading to the kneading passage, and the kneading passage includes the powder granule. A kneading part having a flat cross-sectional shape having a cross-sectional area through which the body and the additive liquid can be appropriately passed, and the additive liquid passage communicates with the kneading passage through openings distributed on the peripheral wall at the upstream end of the kneading part. A kneaded product spray nozzle is described. In this kneaded material spray nozzle, the openings are distributed in a ring shape at one position with respect to the traveling direction of the granular material.

Japanese Utility Model Publication No. 62-170163

  However, according to the study by the present inventors, it has been found that the kneaded product spray nozzle of Patent Document 1 is difficult to knead the powder and liquid uniformly. When the kneading is non-uniform or incomplete, the kneaded product spray nozzle discharges a powder containing no liquid or a liquid containing almost no powder in addition to the uniform kneaded product as the spray material. For example, when the RH dip tube is reinforced by using such a kneaded material spray nozzle, the amorphous refractory discharged in a powder state rebounds without adhering to the RH dip tube. This is called rebound loss. Moreover, even if water that contains almost no amorphous refractory is sprayed, there is no reinforcing effect on the RH dip tube. Therefore, if a kneaded material spray nozzle that is insufficiently kneaded is used, the amount of the irregular refractory required for completing the reinforcement work of the RH dip tube increases, resulting in an increase in cost, and powder is scattered around. As a result, there is a problem that the working environment is deteriorated. Even when the kneaded material spray nozzle is used for purposes other than reinforcement of the RH dip tube, it is an important issue to achieve uniform kneading.

  Then, in view of the said subject, this invention aims at providing the kneaded material spray nozzle which can knead | mix a powder and a liquid uniformly.

  As a result of intensive studies by the present inventor to achieve this object, a plurality of holes at the same height are provided at the peripheral wall of the hollow pipe through which the powder passes to provide a hole for supplying liquid to the powder. The powder and the liquid are uniformly kneaded by arranging the holes at a plurality of height positions and by shifting the plurality of holes at the adjacent height positions. As a result, the present invention has been completed.

This invention is made | formed based on such knowledge, The summary structure is as follows.
(1) An upstream portion that defines a hollow through which the powder passes,
A kneading part located adjacent to the upstream part, having a plurality of holes in the peripheral wall, and defining a hollow for kneading the powder and the liquid introduced from the plurality of holes; and adjacent to the kneading part A downstream part located and defining a hollow through which the kneaded material passes,
A pipe consisting of
A head connected to the downstream portion of the pipe and spraying the kneaded material;
Have
The plurality of holes are respectively divided into a plurality of height positions along the extending direction of the kneading portion, and the plurality of holes at adjacent height positions are viewed from the extending direction. A kneaded material spray nozzle, which is disposed at a position shifted by a distance.

  (2) The kneaded material spray nozzle according to (1), wherein the plurality of holes at the same height position are arranged at substantially equal intervals when viewed from the extending direction at all height positions.

  (3) Spraying the kneaded material according to (1) or (2), wherein all of the plurality of holes at adjacent height positions are substantially equidistant when projected onto a virtual plane perpendicular to the extending direction. nozzle.

  (4) The kneaded material spray nozzle according to any one of (1) to (3), wherein all of the plurality of holes have substantially equal intervals when projected onto a virtual plane perpendicular to the extending direction.

  The kneaded material spray nozzle of the present invention can uniformly knead powder and liquid.

(A) is a perspective view which shows a part of kneaded material spray nozzle 100 by one Embodiment of this invention, (B) is II sectional drawing in (A). (A) is a perspective view showing a part of the pipe 10 of the kneaded product spray nozzle 100 of FIG. It is a figure which shows the positional relationship at the time. It is a perspective view which shows a part of pipe of the kneaded material spray nozzle by other embodiment of this invention. (A) is a perspective view which shows a part of pipe of the kneaded material spray nozzle by a 1st comparative example, (B) saw the several hole in (A) from the extending direction E of the pipe. It is a figure which shows the positional relationship at the time. (A) is a perspective view which shows a part of pipe of the kneaded material spray nozzle by a 2nd comparative example, (B) saw the several hole in (A) from the extending direction E of the pipe. It is a figure which shows the positional relationship at the time. It is a schematic diagram which shows the state which sprays the kneaded material with respect to the RH dip tube using the kneaded material spray nozzle of this invention.

  Hereinafter, embodiments of the kneaded product spray nozzle of the present invention will be described. In each embodiment, corresponding parts are denoted by the same reference numerals and description thereof is omitted.

  First, with reference to FIG. 6, the case where a kneaded material is sprayed with respect to the RH dip tube using the kneaded material spray nozzle 100 according to the present invention will be described. In FIG. 6, the right RH dip tube 60 shows the external appearance, and the left RH dip tube 70 shows the inside by a longitudinal sectional view. The right kneaded product spray nozzle 100 sprays the kneaded product to the outside of the right RH dip tube 60, and the left kneaded product spray nozzle 100 sprays the kneaded product into the left RH dip tube 70.

  The powder is supplied from the flexible container to the upper opening of the tank 80, and the tank 80 stores the powder. The powder is pumped through the pipe of the kneaded product spray nozzle 100. An outer pipe 30 is attached to a part of the pipe, from which water is supplied to the inside of the pipe to knead the powder and water. The water supply system is not shown. The amount of water is adjusted with a valve. Then, the kneaded material passes through the hollow in the pipe of the kneaded material spray nozzle 100 and is discharged from the head 34. In the box 82, there is a gear for raising and lowering the nozzle.

  Next, referring to FIGS. 1A and 1B and FIGS. 2A and 2B, a first embodiment of the present invention that can be used to reinforce the RH dip tube as described above, for example. The kneaded product spray nozzle 100 will be described.

  The kneaded material spray nozzle 100 includes a pipe 10 and a head 34. A plurality of holes are provided in the side wall of the pipe 10, and powder flows upstream from the plurality of holes, liquid is supplied from the outside to the inside of the pipe 10, and downstream from the plurality of holes. Then, a mixture of powder and liquid flows. That is, as shown in FIG. 1A, the pipe 10 is divided into an upstream portion 12, a kneading portion 14, and a downstream portion 16. The upstream portion 12 defines a first hollow 12A through which the powder passes. The kneading part 14 is located adjacent to the upstream part 12, has a plurality of holes 20, 22 in the peripheral wall 18, and a second hollow 14 </ b> A for kneading the powder and the liquid introduced from the plurality of holes 20, 22. Partition. The downstream portion 16 is located adjacent to the kneading portion 14 and defines a third hollow 16A through which the kneaded material passes.

  As shown in FIGS. 1A and 1B, an outer pipe 30 is provided around the kneading portion 14, and the fourth hollow 30 </ b> A is defined by the peripheral wall 18 of the kneading portion 14 and the inner wall of the outer pipe 30. The liquid is supplied from the liquid supply path 32 connected to the outer pipe 30 to the fourth hollow 30A. Liquid is supplied from the fourth hollow 30A to the inside of the pipe 10 (specifically, the second hollow 14A) through the holes 20 and 22.

  Although not shown in FIGS. 1 and 2, the head 34 is connected to the downstream portion 16 of the pipe and discharges the kneaded material. The head 34 is shown in FIG.

A characteristic configuration of the present embodiment is an arrangement of a plurality of holes 20 and 22 provided in the peripheral wall 18 of the kneading portion 14 shown in FIGS. 1 and 2. In the present embodiment, a plurality of holes are provided at two height positions H ₁ and H ₂ along the extending direction E of the kneading unit 14. In FIG. 1 and FIG. 2, the four holes positioned at the first height position H ₁ are defined as the first holes 20, and the four holes positioned at the second height position H ₂ are defined as the second holes 22. To do. In the present embodiment, a plurality of holes each other in the adjacent height, i.e., a first hole 20 located at a first height position H _1, located in the second height position H ₂ The second hole 22 is disposed at a position shifted from the extending direction E.

  The technical significance of adopting such a characteristic configuration will be described in comparison with the following comparative examples.

In the first comparative example shown in FIGS. 4A and 4B, eight holes 40 are arranged at equal intervals at _one height position H ₁ along the extending direction E of the pipe 10. In this case, the powder flowing from upstream, since from one height position H ₁ is only liquid is supplied, short contact time between the powder and the liquid, if the amount of water is small hollow There is a high possibility that only the powder will occur without water reaching the center, resulting in rebound loss. Further, if the amount of water is increased to spread the water to the hollow center, there is a high possibility that an overlapping portion of water supplied from each hole, that is, a portion where water is too much is generated, and in this case, rebound loss also occurs. This tendency is the same even by increasing the number of holes 40 arranged in a height position H _1.

In the second comparative example shown in FIGS. 5A and 5B, four holes are arranged at equal intervals at two height positions H ₁ and H ₂ along the extending direction E of the pipe 10. . However, a first hole 50 located at a first height position H _1, and the second hole 52 located in the second height position H _2, arranged at the same position when viewed from the extending direction E did. In this case, uniform kneading is easier to achieve than in the first comparative example in that the positions of the holes are in two stages. However, when viewed along the extending direction E of the nozzle, there are four lines with two holes, while the other lines are lines with no holes. Therefore, powder and liquid are easy to knead on a line with two holes, but there is a possibility of rebound loss due to the occurrence of excessive water, and kneading on a line with no holes. Because it remains difficult to do, there is a possibility of rebound loss due to too little water.

This tendency is the same even if the number of holes 50 and 52 arranged at each of the height positions H ₁ and H ₂ is increased. When the liquid passes through the hole, it progresses into the pipe in a hemispherical shape. Here, when the number of the holes 50 and 52 is increased, it is not preferable that the liquid supplied from the adjacent holes at the same height position is excessively merged. The amount of liquid introduced from each hole is suppressed. However, in this case, the liquid is not sufficiently supplied to the hollow central portion inside the pipe, and the central portion tends to be a powder-only portion.

  Thus, in both the first and second comparative examples, it was difficult to achieve uniform kneading. On the other hand, in this embodiment, the positions of the holes are arranged in a plurality of stages along the extending direction E of the pipe 10, and the plurality of holes at the adjacent height positions are shifted from each other. For this reason, liquids can be supplied from various angles to the powder that reaches the kneading section 14, and uniform kneading can be easily realized. Therefore, when the kneaded material spray nozzle 100 of this embodiment is used, for example, when spraying a spray material on the RH dip tube, the amount of the amorphous refractory required for the completion of the operation can be reduced, and the surroundings It can suppress that powder disperses.

Next, a kneaded product spray nozzle according to a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the position of the hole provided in the peripheral wall 18 of the kneading part 14 of the pipe 10 is made into three steps. That is, four holes are provided in each of _three height positions H ₁ , H ₂ , and H ₃ along the extending direction E of the kneading unit 14. A plurality of holes each other in the adjacent height, i.e., first and first hole 20 located at a height position H _1, second hole located in the second height position H ₂ 22 and is arranged at a position shifted when viewed from the extension direction E, the first hole 22 located in the second height position H _2, third hole located in the third height position H ₃ 24 is arranged at a position shifted from the extending direction E. In the present embodiment, liquids can be supplied from various angles with respect to the powder reaching the kneading unit 14, and it is easy to realize more uniform kneading.

  Hereinafter, preferred conditions of the present invention will be further described.

In the first embodiment, with reference to FIG. 2 (B), 4 one first hole 20 located at a first height position H ₁ are equally spaced (circumferentially 90 degree interval), four second holes 22 located in the second height position H ₂ are also arranged at equal intervals (circumferentially 90 degrees intervals). In the second embodiment, with reference to FIG. 3, the first hole 20, second hole 22 is the same, even further a third four third located at a height position H ₃ holes 24 It is arranged at equal intervals. Thus, it is preferable that the plurality of holes at the same height position are arranged at substantially equal intervals when viewed from the extending direction E at all height positions. Thereby, it is easy to realize more uniform kneading.

In the first embodiment, and FIG. 2 (B) refer to the four second of the four first hole 20 located at a first height position H ₁ is located at a second height position H ₂ When the holes 22 are projected onto a virtual plane perpendicular to the extending direction E of the kneading part, the intervals are equal (45 degrees on the circumference). In the second embodiment shown in FIG. 3, the first height position H ₁ and the second located at a height H ₂ total of eight holes 20, 22, perpendicular to the extending direction E of the kneading portion Virtual When projected onto a flat surface, the intervals are equal (45 ° on the circumference), and a total of eight holes 22 and 24 located at the second height position H ₂ and the third height position H ₃ are extended to the kneading section. When projected onto a virtual plane perpendicular to the current direction E, the intervals are equal (45 degrees on the circumference). As described above, it is preferable that all of the plurality of holes at adjacent height positions are arranged at substantially equal intervals when projected onto a virtual plane perpendicular to the extending direction E of the kneading portion. Thereby, it is easy to realize more uniform kneading.

Moreover, it is preferable that all the holes provided in the peripheral wall 18 of the kneading part 14 are arranged at substantially equal intervals when projected onto a virtual plane perpendicular to the extending direction E of the kneading part. Thereby, it is easy to realize more uniform kneading. This is particularly advantageous when the positions of the holes are three or more as shown in FIG. In Figure 3, since the disposed height of the three stages by shifting the four holes by 45 degrees, and four first hole 20 located at a first height position H ₁ third height position of the four first hole 24 located H ₃ is the same position as viewed in the extending direction E of the mixing section.

  As a material of the pipe 10 and the outer pipe 30, iron, aluminum, or the like can be used. Moreover, although the cross section perpendicular | vertical to the extending direction E of the pipe 10 and the outer pipe 30 is not limited, Both can be circular. In this case, the inner diameter of the pipe is not particularly limited, but when applied to reinforcement of the RH dip tube, it can be about 30 to 80 mm, and the inner diameter of the outer pipe can be about 50 to 100 mm.

The distance between adjacent vertical position, ie In FIG. 2 the first height position H ₁ second height distance between H _2, FIG. 3 further second height position between H ₂ third the distance between the height position _{H 3} is preferably set to 30 to 60 mm. If it is less than 30 mm, the adjacent height position is too close, and the effect of offset may not be obtained, and kneading may be insufficient. If it exceeds 60 mm, the adjacent height position is too far away in the upstream stage. This is because the kneaded product is likely to dry and rebound loss may increase.

  The number of holes arranged at the same height is four in the first and second embodiments and is not particularly limited, but is preferably in the range of 2 to 8. When the number is less than 2, uniform kneading is difficult, and when the number is more than 8, it is difficult to sufficiently supply the liquid to the hollow central portion inside the pipe due to a decrease in the amount of water per hole. 4-6 is more preferable.

  The height positions at which the plurality of holes are distributed are two in the first embodiment and three in the second embodiment, and are not particularly limited, but are preferably two to four. This is because when it exceeds four places, it is difficult to sufficiently supply the liquid to the hollow central portion inside the pipe due to a decrease in the amount of water.

  The shape of the hole is not particularly limited, but a circular shape is preferable from the viewpoint of supplying the liquid uniformly into the pipe. At this time, the hole diameter d is preferably 1.5 to 3.0 mm. If it is less than 1.5 mm, there is a problem in construction, and if it exceeds 3.0 mm, the flow rate decreases due to a decrease in the amount of water, and it is difficult to sufficiently supply the liquid to the hollow central portion inside the pipe.

When the kneaded product spray nozzle 100 is used to reinforce the RH dip tube, the powdered amorphous refractory moves in the upstream hollow 12A while being densely packed, and the liquid supplied from the hole is the powder. To penetrate. Here, the powder supply rate V ₁ and the liquid supply rate V ₂ per hole may be appropriately set so as to achieve as uniform kneading as possible in consideration of the arrangement and number of holes. Good.

  The kneaded material spray nozzle of the present invention is not limited to use for reinforcing the RH dip tube. For example, it can also be used for the application of refractory spray repair to tundish (TD).

(Invention Example 1)
The kneaded material spray nozzle of the first embodiment shown in FIGS. 1 and 2 was prepared. The origin is as follows.
Inner diameter of pipe: 60mm
Inner diameter of outer pipe: 80mm
The first height position _{H 1} and the second distance between the height position _{H 2:} 40 mm
Hole shape / dimension: circular, diameter 2.5mm

(Comparative example)
A kneaded material spray nozzle shown in FIG. 5 was prepared. The origin is as follows.
Inner diameter of pipe: 60mm
Inner diameter of outer pipe: 80mm
The first height position _{H 1} and the second distance between the height position _{H 2:} 40 mm
Hole shape / dimension: circular, diameter 2.5mm

(Invention Example 2)
A kneaded material spray nozzle of the second embodiment shown in FIG. 3 was prepared. The origin is as follows.
Inner diameter of pipe: 60mm
Inner diameter of outer pipe: 80mm
The first height position _{H 1} and the second distance between the height position _{H 2:} 40 mm
The distance between the second height position between _{H 2} third height position _{H 3:} 40 mm
Hole shape / dimension: circular, diameter 1.5mm

(Invention Example 3)
A kneaded material spray nozzle similar to Example 2 of the present invention was prepared except that the hole diameter was 2.0 mm.

<Experiment method>
The RH dip tube was periodically reinforced using these kneaded product spray nozzles. Specifically, at the stage where repair is required in actual operation, spraying is performed using a kneaded product spray nozzle, and the amount of amorphous refractory used and the number of processing channels from the previous repair to the current repair are recorded. did. In addition, the time when it is considered that the wall thickness is equivalent to that of a new dip tube by visual inspection is finished.

<Evaluation>
In each test example, the average amount of the irregular refractory required for the reinforcement work of the RH dip tube was calculated from the amount of the irregular refractory used and the number of charges processed during that period. The results are shown in Table 1.

  When the ejection state of the spray material from the kneaded material spray nozzle in each test example was visually observed, in the comparative example, in addition to the kneaded material, an amorphous refractory powder was discharged. Therefore, it is considered that a large amount of rebound loss has occurred. On the other hand, in Inventive Examples 1 to 3, most of the spray material was a kneaded product, and the behavior of the amorphous refractory powder was reduced around the kneaded product spray nozzle. Therefore, the effect of reducing rebound loss can be expected.

  In fact, as is apparent from Table 1, in the comparative example, a large amount of the amorphous refractory required for the reinforcement work of the RH dip tube was required, whereas in the inventive examples 1 to 3, a small amount was sufficient.

  The kneaded material spray nozzle of the present invention can uniformly knead powder and liquid. Therefore, for example, when used when spraying a spray material on the RH dip tube, the amount of the amorphous refractory necessary for completion of the operation can be reduced, and the powder can be prevented from being scattered around.

DESCRIPTION OF SYMBOLS 100 Kneaded material spray nozzle 10 Pipe 12 Upstream part 12A 1st hollow 14 Kneading part 14A 2nd hollow 16 Downstream part 16A 3rd hollow 18 Perimeter wall of kneading part 20 1st hole 22 2nd hole 24 3rd hole 30 Outer pipe 30A Fourth hollow 32 Liquid supply path 34 Head 60, 70 RH dip pipe 80 Tank 82 Box E Extending direction of kneading part H ₁ First height position H ₂ Second height position H ₃ Third Height position

Claims (4)

An upstream section defining a hollow through which the powder passes,
A kneading part located adjacent to the upstream part, having a plurality of holes in the peripheral wall, and defining a hollow for kneading the powder and the liquid introduced from the plurality of holes; and adjacent to the kneading part A downstream part located and defining a hollow through which the kneaded material passes,
A pipe consisting of
A head connected to the downstream portion of the pipe and spraying the kneaded material;
Have
The plurality of holes are respectively divided into a plurality of height positions along the extending direction of the kneading portion, and the plurality of holes at adjacent height positions are viewed from the extending direction. A kneaded material spray nozzle, which is disposed at a position shifted by a distance.   2. The kneaded material spray nozzle according to claim 1, wherein, at all height positions, the plurality of holes at the same height position are arranged at substantially equal intervals when viewed from the extending direction.   3. The kneaded material spray nozzle according to claim 1, wherein all of the plurality of holes at adjacent height positions are substantially equidistant when projected onto a virtual plane perpendicular to the extending direction. 4. The kneaded material spray nozzle according to any one of claims 1 to 3, wherein all of the plurality of holes have substantially equal intervals when projected onto a virtual plane perpendicular to the extending direction.

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