JP6597919B2 - Pressurized steam aging device - Google Patents

Description

The present invention is a pressurized steam for aging a steelmaking slag containing unfoamed lime (also called free lime) discharged from a converter, an electric furnace, etc. in a short time using pressurized steam. The present invention relates to an aging device.
This application claims priority based on Japanese Patent Application No. 2017-011870 filed in Japan on January 26, 2017, the contents of which are incorporated herein by reference.

  Steelmaking slag generated in the steelmaking process is hard and has an angular surface, so that it is well meshed during road rolling and has excellent properties as a roadbed material.

  However, in the steelmaking slag, a part of quicklime used as a dephosphorizing agent / desulfurizing agent remains as undecomposed lime without being completely bonded to other molecules.

  Therefore, if this steelmaking slag is used as a roadbed material as it is, it may cause a hydration reaction over time to expand / collapse, resulting in adverse effects such as ground uplift.

  Therefore, when steelmaking slag is used for roadbed materials, etc., aging is performed in advance to complete the expansion / collapse phenomenon so that it can be used stably. Aging is an operation of artificially swelling steelmaking slag containing undehydrated lime (free lime) in a short time using, for example, pressurized steam.

  As a prior art document relating to an aging method and apparatus for steelmaking slag, for example, Patent Document 1 is cited.

  The technique proposed in Patent Document 1 is a method in which normal temperature steelmaking slag having a particle size of 25 mm or less is 80% or more is charged and sealed in a pressure vessel, and then pressurized steam is put in the pressure vessel. To heat the pressure vessel and slag. Then, the temperature inside the pressure vessel is increased while the hot water condensed by the above operation is discharged, and then the inside of the pressure vessel is held in a saturated steam atmosphere at a pressure of 0.196 to 0.98 MPa for 1 to 5 hours. The pressure vessel is depressurized to atmospheric pressure and steelmaking slag is discharged.

  Patent Document 2 is characterized in that air-mixed vapor accumulated inside the pressure vessel is released to the outside of the pressure vessel in accordance with the temperature raising / pressure-raising step in the pressure vessel and the temperature maintaining step in the saturated steam atmosphere. A steel slag aging method and apparatus have been proposed.

  An outline of steam aging using the apparatus proposed in Patent Document 2 is shown in FIGS. 9A and 9B. Steam aging using the apparatus proposed in Patent Document 2 is performed as follows. First, using a loading device 101 such as a tractor excavator, a steelmaking slag 102 to be steam-aged is charged into an unsealed slag storage container 103.

  Thereafter, the slag storage container 103 is transferred to the inside of the pressure vessel 104, saturated steam at a predetermined pressure is supplied from a steam supply port 104a provided above the slag storage vessel 103, and the inside of the pressure vessel 104 is maintained for a predetermined time for a predetermined time. The steelmaking slag 102 is aged while maintaining the pressure. The steelmaking slag 102 that has been subjected to the aging process is carried out with the bottom of the slag storage container 103 opened.

  Furthermore, Patent Document 3 discloses a pressurized steam aging method and apparatus in which pressurized steam is distributed in the slag in a short time and a hydration reaction is possible in a short time.

  As shown in FIGS. 10A and 10B, the steam aging apparatus proposed in Patent Document 3 leads a pipe 205 for supplying pressurized steam to the inside of a slag storage container 203 carried into the pressure container 204. The pressurized steam is supplied from the hole 205 a provided in 205 to the steelmaking slag inserted in the slag storage container 203.

  However, even in the steam aging apparatus of Patent Document 3, when the number of times of aging treatment of steelmaking slag having a particularly high ratio of powder is repeated, aging efficiency cannot be maintained due to clogging of the holes 205a. High frequency equipment maintenance is required. Further, as shown in FIG. 10A, the pipe 205 is arranged in the longitudinal direction of the pressure vessel 204. Usually, since the steelmaking slag is introduced into the pressure vessel 204 from above in the vertical direction, the pipe 205 is damaged by depression or bending due to the fallen steelmaking slag. Therefore, frequent maintenance of the equipment is required.

  Furthermore, Patent Document 4 discloses a steelmaking slag aging method capable of completing an expansion reaction even when steaming aging steelmaking slag having a large proportion of grains.

  However, even with the aging method of Patent Document 4, a decrease in aging efficiency due to clogging of holes and the like cannot be avoided.

Japanese Laid-Open Patent Publication No. 8-165151 Japanese Unexamined Patent Publication No. 9-118549 Japanese Unexamined Patent Publication No. 2009-280445 Japanese Unexamined Patent Publication No. 2012-41234

  The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to maintain equipment maintenance even when aging steelmaking slag containing a large proportion of powdered material. An object of the present invention is to provide a pressurized steam aging device for steelmaking slag capable of increasing the aging efficiency while suppressing the frequency.

  The outline of the present invention is as follows.

(1) One aspect of the present invention is a steelmaking slag pressure steam aging device for aging steelmaking slag with pressurized steam, the slag storage container in which the steelmaking slag is charged, and the slag storage container A pressure vessel provided outside the pressure vessel and supplying the pressurized steam to the inside of the pressure vessel, provided inside the pressure vessel, and inside the slag storage vessel. A second pipe for supplying pressurized steam, and the second pipe is provided inside the slag storage container along a horizontal direction, and is provided to rise upward from the main pipe. And a branch pipe part formed with a jet hole for jetting the pressurized steam on the side surface, and when the dimension in the height direction of the storage area of the slag storage container is H (mm), 0. The ejection holes are arranged in the height direction region of × H~0.6 × H.

(2) In the pressurized steam aging device described in the above (1), the second pipe has an outer diameter larger than the outer diameter of the branch pipe part above the ejection hole of the branch pipe part. You may further provide an enlarged diameter part.
(3) In the pressurized steam aging device described in (2) above, the enlarged diameter portion may be provided at the tip of the branch pipe portion.
(4) In the pressurized steam aging device described in (2) or (3) above, when the outer diameter of the enlarged diameter portion is D (mm) and the outer diameter of the branch pipe portion is d (mm) , D ≧ 2 × d may be satisfied.
(5) In the pressurized steam aging device described in any one of (2) to (4) above, the center of the ejection hole and the edge of the lower surface of the enlarged diameter portion of the ejection hole The inclination angle from the horizontal line of the line connecting the position closest to the center point may be 45 ° or less.
(6) In the pressurized steam aging device described in any one of (2) to (5) above, the separation distance between the lower end portion of the enlarged diameter portion and the center point of the ejection hole is set to L1 (mm). When the outer diameter of the branch pipe portion is d (mm), L1 ≦ d may be satisfied.

(7) In the pressurized steam aging apparatus described in any one of (1) to (5) above, when the longitudinal dimension of the storage area of the slag storage container is L (mm), the storage The said ejection hole may be arrange | positioned in the longitudinal direction area | region of 0.2 * L-0.8 * L in an area | region.
(8) In the pressurized steam aging device described in any one of (1) to (7) above, when the dimension in the width direction of the storage area of the slag storage container is W, 0 in the storage area. The said ejection hole may be arrange | positioned in the width direction area | region of 2 * W-0.8 * W.
(9) In the pressurized steam aging device described in any one of (1) to (8) above, a plurality of the ejection holes may be provided in the circumferential direction of the branch pipe portion.
(10) In the pressurized steam aging device described in any one of (1) to (9) above, a plurality of the ejection holes may be provided in the height direction of the branch pipe portion.

According to the configuration described in (1) above, since the branch pipe portion is provided to rise upward, the steel pipe slag is inserted into the slag storage container at the tip of the branch pipe portion. Steelmaking slag collides. Therefore, since the filling degree of the steelmaking slag in the vicinity of the pressurized steam injection hole formed on the side surface of the branch pipe part is reduced, the pressurized steam can be efficiently supplied to the central part of the steelmaking slag. Further, along with this, clogging of the ejection holes can be prevented.
Furthermore, since the branch pipe portion is provided to rise upward from the main pipe portion, even if the ejection holes are arranged in the height direction region of 0.3 × H to 0.6 × H in the storage region, The main pipe portion can be arranged at a low position in the storage area. Therefore, when the steelmaking slag is inserted into the slag storage container, the number of times the steelmaking slag collides with the main pipe part is suppressed to prevent physical damage to the main pipe part, and the pressurized steam is efficiently applied to the center part of the steelmaking slag. Can be supplied.
Therefore, even when the ratio of the powdery material contained in the steelmaking slag is large, the aging efficiency can be increased while suppressing the frequency of equipment maintenance.
Moreover, according to the structure described in said (2)-(10), aging efficiency can further be raised, further suppressing the frequency of equipment maintenance.

It is a schematic front view which shows schematic structure of the steam aging apparatus which concerns on one Embodiment of this invention. It is a schematic sectional drawing obtained along the BB line of FIG. 1, and shows the state which removed the 2nd piping. It is a schematic perspective view for demonstrating the dimension of storage area | region (alpha). It is a schematic plan view which shows a main pipe part and a branch pipe part. It is a schematic front view which shows a main pipe part and a branch pipe part. It is the schematic for demonstrating the dimension of a branch pipe part and an enlarged diameter part. It is a schematic diagram for demonstrating the ejection aspect of pressurized steam in case the filling degree of the steelmaking slag in the vicinity of an ejection hole is high. It is a schematic diagram for demonstrating the ejection aspect of pressurized steam in case the filling degree of the steelmaking slag in the vicinity of an ejection hole is low. It is a schematic plan view which shows the 1st modification of a branch pipe part. It is a schematic front view which shows the modification. It is a schematic plan view which shows the 2nd modification of a branch pipe part. It is a schematic front view which shows the modification. It is a schematic plan view which shows the 3rd modification of a branch pipe part. It is a schematic front view which shows the modification. It is a figure explaining the outline | summary of the steam aging using the installation proposed by patent document 2. FIG. It is an enlarged view of the slag storage container of FIG. 9A. It is a side view explaining schematic structure of the pressurization type steam aging device proposed by patent documents 3. It is a top view explaining schematic structure of the pressurization type steam aging device proposed by patent documents 3.

  The present inventors diligently studied to increase the aging efficiency while suppressing the frequency of equipment maintenance in the pressurized steam aging apparatus.

As a result, the following knowledge was obtained.
10A and 10B, when the hole 205a for ejecting steam is formed in the pipe 205 arranged in the longitudinal direction, steelmaking slag in the vicinity of the hole 205a exists with a high filling degree. In this case, the ejection of steam from the hole 205a is prevented. Further, there is a possibility that the hole 205a may be clogged. Therefore, if a steam hole is formed in the side surface of the branch pipe portion that is raised in the vertical direction, the steelmaking slag dropped and charged from above will collide with the upper part of the pipe, and the degree of filling of the steelmaking slag near the hole will be determined. Can be lowered. Thereby, it is possible to effectively eject the steam from the hole and to prevent clogging.
Moreover, in the prior art shown to FIG. 10A and FIG. 10B, there exists a possibility that clogging may generate | occur | produce when slag surface water (lime water) flows in into an ejection hole. However, it is possible to alleviate the inflow of slag surface water by forming a steam hole in the side surface of the branch pipe portion raised in the vertical direction.
Furthermore, in the prior art shown in FIGS. 10A and 10B, since the pipe 205 is arranged higher than the central portion in the height direction, the steelmaking slag dropped and charged from the upper side frequently collides with the pipe. There is a risk of physical damage. However, if the branch pipe part is provided so as to rise in the vertical direction from the main pipe part provided in the horizontal direction, the storage area of the slag storage container is 0.3. An ejection hole can be arrange | positioned in the height direction area | region of * H-0.6 * H. Thereby, steam aging can be advanced efficiently, suppressing the frequency of equipment maintenance.

  Hereinafter, a steelmaking slag pressurized steam aging apparatus 1 (hereinafter simply referred to as “steam aging apparatus 1”) according to an embodiment of the present invention based on the above-described knowledge will be described with reference to the drawings.

As shown in FIGS. 1 and 2, the steam aging device 1 according to the present embodiment is a substantially cylindrical device, and includes a slag storage container 11, a pressure container 12, a first pipe 13, and a second pipe 14. Have
In the following description, the longitudinal direction X is a direction along the longitudinal direction of the steam aging device 1, the height direction Y is a vertical direction, and the width direction Z is the longitudinal direction X and the height direction Y. The direction is perpendicular to.

  The slag storage container 11 is a container for storing steel slag in which steam aging is performed, and includes a pair of storage members 111 and two support members 112 as shown in FIG.

  Each storage member 111 is configured by connecting end surfaces 111e to both longitudinal ends of a bottom surface 111a, a first inclined surface 111b, a side surface 111c, and a second inclined surface 111d extending along the longitudinal direction X.

  The support member 112 includes a column part 112 a that is provided to rise upward from the bottom of the pressure vessel 12, and a shaft 112 b that extends along the longitudinal direction X from the upper end of the column part 112 a. The shaft 112b is provided so as to pivot on the column part 112a in a state where the pair of end surfaces 111e are overlapped with each other, and supports the pair of storage members 111 so as to be rotatable around the axis of the shaft 112b.

An opening is formed above the slag storage container 11, and the steelmaking slag is inserted into the slag storage container 11 from this opening. In the example shown in FIG. 2, when steelmaking slag is inserted into the slag storage container 11 and when steam aging is performed, the ends of the pair of bottom surfaces 111 a are in contact with each other and face each other. However, a part of the tips of the pair of bottom surfaces 111a may overlap each other.
And after steam aging is performed, as shown with the dashed-two dotted line of FIG. 2, steel-making slag is discharged | emitted by opening a pair of accommodating member 111 centering on the shaft 112b.
For the operation of the storage member 111, a hydraulic cylinder or the like (not shown) may be used. Further, when the storage member 111 is rotated to discharge the steelmaking slag, the bottom of the storage member 111 may be formed in an arc shape and a roller or the like (not shown) may be installed below the storage member 111 in order to perform a smooth operation. Good.

  Further, when the steelmaking slag is charged into the slag storage container 11, the slag storage container 11 is usually carried out of the pressure container 12 as shown in FIG. 9A. Therefore, when the steam aging device 1 according to the present embodiment carries out the slag storage container 11 from the pressure vessel 12 and carries it into the pressure vessel 12 after installing the steelmaking slag, the main pipe portion described later is provided. It is preferable that the structure is capable of carrying in and out in a state where the 14a and the branch pipe portion 14b are installed at appropriate positions inside the slag storage container 11.

Here, the storage area α of the slag storage container 11 will be described with reference to FIG.
The storage area α is an internal space in the slag storage container 11 in which steelmaking slag is stored. FIG. 3 shows an example of the storage area α, and the shape of the slag storage container and the storage area α is not limited. Steelmaking slag may be charged up to a position higher than the opening provided in the upper portion of the slag storage container 11, but even in this case, the region higher than the opening is included in the storage region α. Absent. That is, the storage area α does not depend on the amount of steelmaking slag to be charged, but depends on the internal dimensions of the slag storage container 11.
As shown in FIG. 3, in the present application, for the storage region α, the length from end to end along each axis is a dimension, the dimension in the height direction Y is H (mm), and the dimension is in the longitudinal direction X. Is defined as L (mm), and the dimension in the width direction Z is defined as W (mm).

  The pressure container 12 is a container that can be hermetically sealed to house the slag container 11. The pressure vessel 12 includes an opening / closing lid 12a for enabling the slag storage container 11 to be carried in / out. The pressure vessel 12 is provided with a sensor (not shown) that measures internal pressure and temperature. In addition, a first pipe 13 is disposed on the pressure vessel 12 above the pressure vessel 12 (above the opening of the slag container 11) so that pressurized steam can be supplied to the pressure vessel 12. The second pipe 14 is led into the slag storage container 11 so that pressurized steam can be directly supplied to the steelmaking slag charged in the slag storage container 11.

  The first pipe 13 is provided outside the pressure vessel 12 and connected to the upper portion of the pressure vessel 12, and supplies the pressurized steam supplied from the pressurized steam supply device 50 to the inside of the pressure vessel 12. The pressurized steam supplied through the first pipe 13 can promote the progress of steam aging by directly contacting the steelmaking slag exposed in the vicinity of the opening of the slag container 11.

The second pipe 14 is provided inside the pressure vessel 12 and connected to a side portion of the pressure vessel 12, and supplies the pressurized steam supplied from the pressurized steam supply device 50 to the inside of the slag storage container 11.
The second pipe 14 includes a main pipe portion 14a and a branch pipe portion 14b, and jets pressurized steam from a jet hole 14ba formed in the branch pipe portion 14b. Thereby, advancing of steam aging can be accelerated | stimulated by making pressurized steam contact the inside of the steelmaking slag currently charged by the slag storage container 11. FIG.

  In the steam aging device 1 according to this embodiment, the pressurized steam supply device 50 is connected to the first pipe 13 and the second pipe 14 through a pipe 52 having a valve 51.

  As shown in FIG. 1, the main pipe part 14 a is connected along the longitudinal direction X inside the slag storage container 11 with connection pipe parts 14 d connected to both ends in the longitudinal direction X. The connecting pipe portion 14 d is provided in an inverted U shape so as to straddle the end surface 111 e of the storage member 111 of the slag storage container 11. The connecting pipe portion 14 d is connected to a pressurized steam supply device 50 provided outside the pressure vessel 12 via a valve 51 and a pipe 52.

The main pipe portion 14 a is preferably provided in a height direction region of 0.1 × H to 0.3 × H in the storage region α of the slag storage container 11.
When the main pipe portion 14a is provided in a height direction region of less than 0.1 × H, the gap between the main pipe portion 14a and the slag storage container 11 is reduced, and the fine powder in the drain water existing below the slag storage container 11 When the slag grows, the gap may be filled. In this case, the main pipe portion 14a is preferably provided in a height direction region of 0.1 × H or more because it may cause a malfunction when the pair of storage members 111 are opened.
On the other hand, when the main pipe portion 14a is arranged in the height direction region of 0.3 × H or less, the ejection hole 14ba can be arranged in an appropriate height direction region even if the long branch pipe portion 14b is used. . In this case, it is preferable in that it is possible to prevent clogging of the ejection holes 14ba due to the steelmaking slag existing at a relatively high degree of filling by being deposited on the upper portion of the main pipe portion. Further, when the main pipe portion 14a is arranged in a height direction region of 0.3 × H or less, the number of collisions with the steelmaking slag dropped from the opening portion is reduced, so that physical damage to the main pipe portion 14a can be prevented. This is also preferable.

As shown in FIGS. 4A and 4B, the branch pipe portion 14 b is provided on the main pipe portion 14 a so as to rise upward from a plurality of locations spaced at predetermined intervals along the longitudinal direction X. A plurality of branch pipe portions 14b may be provided, and at least one branch pipe portion may be provided. The side surface of each branch pipe part 14b is provided with an outlet hole 14ba for pressurized steam. A plurality of ejection holes 14ba may be provided on the side surface of the branch pipe portion 14b, or a plurality of jet holes 14ba may be provided in the circumferential direction of the branch pipe portion 14b. Further, a plurality of pressurized steam ejection holes 14ba are provided at equiangular positions in the circumferential direction on the side surface near the tip of each branch pipe portion 14b.
The pressurized steam supplied from the pressurized steam supply device 50 is ejected from the ejection hole 14ba through the main pipe portion 14a and the branch pipe portion 14b, and is supplied to the steelmaking slag inserted in the slag storage container 11. .

Since the pressurized steam ejected from the ejection hole 14ba is injected at a predetermined expansion angle, as shown in FIG. 5A, when the degree of filling of the steelmaking slag around the ejection hole 14ba is high, the pressurized steam is converted into the steelmaking slag. On the other hand, when the filling degree of the steelmaking slag around the ejection hole 14ba is low as shown in FIG. 5B, the area where the pressurized steam collides with the steelmaking slag is increased.
In the steam aging device according to the present embodiment, the branch pipe portion 14b is provided so as to rise upward. Therefore, when the steel slag is dropped into the slag storage container 11, the branch pipe portion is inserted. Steelmaking slag collides with the tip of 14b. Accordingly, the filling degree of the steelmaking slag in the vicinity of the pressurized steam injection hole 14ba formed on the side surface of the branch pipe part 14b is lowered, so that the pressurized steam is efficiently supplied to the central part of the steelmaking slag to be charged. be able to. As a result, clogging of the ejection holes can be prevented.

The ejection hole 14ba is arranged in a height direction region of 0.3 × H to 0.6 × H in the storage region α. Steam aging (hydration reaction) of the steelmaking slag is performed at the center of the slag storage container 11 rather than near the opening of the slag storage container 11 and the pair of storage members 111 with which the pressurized steam supplied from the first pipe 13 is in direct contact. Progress is slow at the club.
Therefore, by arranging the ejection hole 14ba in the height direction region of 0.3 × H to 0.6 × H in the storage region α, pressurized steam is supplied from the center in the height direction of the steelmaking slag inserted. Steel slag can be supplied and steam aging can be efficiently advanced. Preferably, it may be 0.35 × H to 0.6 × H, more preferably 0.4 × H to 0.6 × H, and still more preferably 0.45 × H to 0.6 × H.
The height direction position of the ejection hole 14ba may be adjusted by the formation position of the ejection hole 14ba in the branch pipe part 14b, may be adjusted by the height of the branch pipe part 14b, or the height direction position of the main pipe part 14a. You may adjust with.

  According to the steam aging device 1 according to the present embodiment, since the branch pipe portion 14b is provided to rise upward from the main pipe portion 14a, 0.3 × H to 0.6 × H in the storage region α. Even if the ejection holes 14ba are arranged in the height direction region, the main pipe portion 14a can be arranged at a low position (for example, a height direction region of 0.1 × H to 0.3 × H) in the storage region α. . Therefore, when steelmaking slag is inserted into the slag storage container 11, the number of times that the steelmaking slag collides with the main pipe portion 14a is suppressed to prevent physical damage to the main pipe portion 14a, and the center portion of the steelmaking slag to be inserted. The pressurized steam can be supplied efficiently.

  In order to advance steam aging more efficiently, it is preferable to supply pressurized steam to the longitudinal center of the steelmaking slag. Therefore, the ejection hole 14ba is preferably provided in a longitudinal direction region of 0.2 × L to 0.8 × L in the storage region α of the slag storage container 11. More preferably, it may be 0.25 × L to 0.75 × L.

  Similarly, in order to advance steam aging more efficiently, it is preferable to supply pressurized steam to the center part in the width direction of the steelmaking slag. Therefore, the ejection hole 14ba is preferably provided in a width direction region of 0.2 × W to 0.8 × W in the storage region α of the slag storage container 11. More preferably, it may be 0.3 × W to 0.7 × W, and further preferably 0.4 × W to 0.6 × W.

  In the steam aging device 1 according to the present embodiment, as shown in FIG. 4C, a disc-shaped enlarged portion 14c having an outer diameter D larger than the outer diameter d of the branch pipe portion 14b at the tip of the branch pipe portion 14b. Is formed. As shown in FIG. 4C, the outer diameter D of the enlarged diameter portion 14c is larger than the outer diameter d of the branch pipe portion 14b. In addition, when the planar view shape of the enlarged diameter part 14c is not circular, the equivalent circle diameter of the planar view shape of the enlarged diameter part 14c is handled as an outer diameter.

When the enlarged diameter portion 14c is formed, the steelmaking slag collides with the enlarged diameter portion 14c at the tip of the branch pipe portion 14b when the steelmaking slag is inserted into the slag storage container 11. Therefore, the area where the steelmaking slag collides is increased as compared with the case where the enlarged diameter portion 14c is not formed. Accordingly, the degree of filling of the steelmaking slag in the vicinity of the pressurized steam injection hole 14ba formed on the side surface of the branch pipe portion 14b is further reduced, so that the pressurized steam is efficiently supplied to the central portion of the steelmaking slag to be charged. can do. Further, along with this, clogging of the ejection hole 14ba can be further prevented.
Furthermore, when the enlarged diameter portion 14c is formed, the effect of preventing the slag surface water (lime water) from flowing into the ejection hole 14ba can be further improved, so that the ejection hole 14ba is more reliably clogged. Can be prevented.
Furthermore, it is possible to reduce physical damage caused by the steelmaking slag dropped and charged from above and colliding with the main pipe portion 14a.

  The size (outer diameter, thickness, etc.) of the enlarged diameter portion 14c is optimum in accordance with the outer diameter d of the branch pipe portion 14b and the position and size of the ejection hole 14ba in the rising direction so as to produce the above-described effects. It is decided to be a big size. Conversely, the size of the ejection hole 14ba and the position to be provided may be appropriately determined according to the size of the enlarged diameter portion 14c.

In order to reduce the filling degree of the steelmaking slag in the vicinity of the ejection hole 14ba and prevent the ejection hole 14ba from being clogged, and further increase the efficiency of steam aging, it is preferable to satisfy one or more of the following conditions.
(Condition 1) D ≧ 2 × d
(Condition 2) θ ≦ 45 °
(Condition 3) L1 ≦ d
Here, as shown in FIG. 4C, D is the outer diameter (mm) of the enlarged diameter portion 14c, d is the outer diameter (mm) of the branch pipe portion 14b, and L1 is enlarged from the center point of the ejection hole 14ba. Is the separation distance (mm) to the lower end of the diameter portion 14c, and θ is the center point of the ejection hole 14ba and the position closest to the center point of the ejection hole 14ba among the edges of the lower surface of the enlarged diameter portion 14c. The inclination angle (°) of the connecting line from the horizontal line.

  The outer diameter and thickness of the main pipe part 14a and the branch pipe part 14b, the upward direction and length of the branch pipe part 14b, the number of installations (installation interval), and the number of ejection holes 14ba provided on the side surface of the branch pipe part 14b The size is not particularly limited as long as the effect of the present invention is obtained. That is, the outer diameter and thickness of the main pipe portion 14a and the branch pipe portion 14b are determined by the amount of pressurized steam to be supplied to the steelmaking slag, the impact when the steelmaking slag to be charged is charged, and the weight of the steelmaking slag after charging. Determine the size to withstand. Further, the upward direction and length of the branch pipe portion 14b are determined depending on the installation position of the slag storage container 11 in the main pipe portion 14a, and the ejection hole 14ba provided in the branch pipe portion 14b is stored in the slag storage container 11. What is necessary is just to determine so that it may arrange | position to the suitable position of the area | region (alpha).

  According to the steam aging device 1 according to the above-described embodiment, even when steelmaking slag having a large proportion of powder is charged into the slag storage container 11, the filling degree of the steelmaking slag in the vicinity of the ejection hole 14ba is reduced and ejected. The clogging of the hole 14ba can be prevented. Therefore, pressurized steam can be effectively supplied to the center of the steelmaking slag charged in the slag storage container 11, and is compatible with the pressurized steam supplied from the first pipe 13 to the inside of the pressure container 12. Thus, steam aging of the steelmaking slag can be advanced in a short time. Thereby, it becomes possible to advance aging efficiently, suppressing the frequency of equipment maintenance.

  It goes without saying that the present invention is not limited to the above-described examples, and the embodiments may be changed as appropriate within the scope of the technical idea described in each claim.

  For example, the installation number (installation interval) of the branch pipe part 14b, the positions, the number, and the size in the circumferential direction and the rising direction of the ejection holes 14ba provided in the branch pipe part 14b are not limited to the examples shown in the above embodiment, What is necessary is just to determine so that pressurized steam can be effectively supplied to the steelmaking slag located in the center part of the slag storage container 11. FIG.

The branch pipe portion 14b may be tilted in the longitudinal direction X as in the first modification shown in FIGS. 6A and 6B, and in the width direction Z as in the second modification shown in FIGS. 7A and 7B. It may be tilted up and may be tilted in the longitudinal direction X and the width direction Z as in the third modification shown in FIGS. 8A and 8B.
Moreover, the ejection hole 14ba may be provided in multiple places in the height direction Y of the branch pipe part 14b like the 1st modification-3rd modification shown to FIG. 6A-FIG. 8B. When the ejection holes 14ba are provided at a plurality of locations, it is preferable that all the ejection holes 14ba are arranged in a height direction region of 0.3 × H to 0.6 × H in the storage region α.

In the steam aging device 1 according to the above-described embodiment, the second pipe 14 has the enlarged diameter portion 14c, but may not have the enlarged diameter portion 14c.
In the steam aging device 1 according to the above embodiment, the main pipe portion 14a is provided along the longitudinal direction X inside the slag storage container 11, but may be provided meandering in the width direction Z. That is, the main pipe portion 14a only needs to be provided along the horizontal direction.

In the steam aging device 1 according to the above embodiment, the ejection holes 14ba of all the branch pipe portions 14b are all the same size, but may be different.
In the steam aging device 1 according to the above-described embodiment, the ejection hole 14ba provided in the branch pipe portion 14b is circular, but the shape of the ejection hole 14ba is not limited to a circle and may be an ellipse or a polygon. Moreover, what provided the slit in the branch pipe part 14b may be used.

In the steam aging device 1 according to the above embodiment, the disk-shaped enlarged diameter portion 14c is provided at the tip of the branch pipe portion 14b. However, the planar view shape of the enlarged diameter portion 14c may be an ellipse or a polygon. Further, it may be conical instead of plate-shaped. Further, the position at which the enlarged diameter portion 14c is provided may not be the tip of the branch pipe portion 14b, but may be any position above the ejection hole 14ba.
The steam aging device 1 according to the above embodiment has only one main pipe portion 14a. However, the capacity of the slag storage container 11 is increased, and only the pressurized steam ejected from the branch pipe part 14b provided in one main pipe part 14a is added to the central part of the steelmaking slag charged in the slag storage container 11. When the pressurized steam cannot be effectively supplied, a plurality of main pipe parts 14a including the branch pipe parts 14b may be provided.

(Example)
In the experimental example 1, the steam aging apparatus 1 shown in FIG. 1 was used, and in the experimental examples 2 to 9, the steam aging apparatus in which various changes were made to the steam aging apparatus 1 was used to perform the steam aging treatment.

The main common conditions in each experimental example are as follows.
-Average particle size of steelmaking slag: As the particle size of steelmaking slag, the standard 0-40mm of steel slag for roads
-Pressure in the pressure vessel: 0.5 MPa
-Storage area height H: 1790 mm
-Storage area width W: 2800 mm
-Storage area length L: 6400 mm
-Position in the width direction of the main pipe: 0.5 x W
・ Diameter of main pipe: 4.5mm
Steam aging time: 2 hours / cycle Steelmaking slag amount: 45 t / cycle In Experimental Examples 1 to 8, 4 of 0.25 × L, 0.42 × L, 0.58 × L, and 0.75 × L A branch pipe portion was erected on the main pipe portion at the longitudinal position of the location. Each branch pipe part was provided with eight ejection holes at equal intervals in the circumferential direction. Thereby, it was set as the structure by which a vapor | steam is ejected from 32 ejection holes.
On the other hand, in Experimental Example 9, as shown in FIGS. 10A and 10B, the main pipe part is provided at the height of the storage area of 710 mm and 1530 mm without providing the branch pipe part, and 10 pieces are provided for each side of each main pipe part. Were formed at equal intervals in a line in the longitudinal direction. Thereby, it was set as the structure by which a vapor | steam is ejected from a total of 40 ejection holes in two main pipe parts.
In the experiment, in order to perform aging once, a step of heating steelmaking slag to a predetermined temperature after charging the steam aging device 1 and a step of setting the predetermined temperature after completion of the steam aging are required. These steps take a total of 1 hour. That is, in the experiment, the time required for charging the steel slag into the steam aging device 1 and performing the steam aging treatment and discharging the steel slag from the steam aging device 1 is 3 hours / cycle.
In one day, the above experiment was repeated 8 times to treat 360 tons / day of steelmaking slag. The above experiment was carried out 8 cycles, and 360 tons / day of steelmaking slag treatment was carried out for 1 month, 3 months, and 6 months without stopping the operation.

  Table 1 shows the individual conditions in each experimental example.

  The steelmaking slag after the above steam aging treatment was subjected to a water immersion expansion test defined in Annex B of JIS A 5015 (2013), and a water immersion expansion ratio was measured. The results are shown in Table 2.

ａ：蒸気エージング前の製鋼スラグの水浸膨張試験結果：水浸膨脹比（％）
ｂ：蒸気エージング後の製鋼スラグの水浸膨張試験結果：水浸膨脹比（％）
低減率：低減率＝（ｂ／ａ）×１００ （％）
実施初期：１日目にエージングしたスラグを水浸膨張試験した結果
実施一ヶ月後：一ヶ月間毎日操業した後の操業で蒸気エージングしたスラグの水浸膨張試験結果
実施三ヶ月後：三ヶ月間毎日操業した後の操業で蒸気エージングしたスラグの水浸膨張試験結果
実施六ヶ月後：六ヶ月間毎日操業した後の操業で蒸気エージングしたスラグの水浸膨張試験結果

a: Water immersion expansion test result of steelmaking slag before steam aging: Water immersion expansion ratio (%)
b: Water immersion expansion test result of steelmaking slag after steam aging: Water immersion expansion ratio (%)
Reduction rate: Reduction rate = (b / a) × 100 (%)
Initial stage: Results of water immersion expansion test of slag aged on the first day One month later: Results of water immersion expansion test of steam aging slag after daily operation for one month Three months later: Three months Results of water immersion expansion test for slag steam-aged after operation every 6 months: Results of water expansion test for slag steam-aged after daily operation for 6 months

  In Experimental Examples 1 to 4, since steam aging was performed under appropriate conditions, steam aging could be performed with high efficiency. Particularly, in Experimental Examples 1, 2, and 4 in which the enlarged diameter portion was provided, particularly good results were obtained as compared with Experimental Example 3 in which the enlarged diameter portion was not provided. This can further reduce the filling degree of the steelmaking slag in the vicinity of the ejection hole by the enlarged diameter portion, and supply pressurized steam from the inside of the steelmaking slag to the whole while suppressing the occurrence of nozzle clogging. It is assumed that it was made.

  In Experimental Examples 5 to 8, steam aging with high efficiency could not be performed. It is inferred that the pressurized holes could not be sufficiently supplied to the center of the slag because the ejection holes were not disposed in the height direction region of 0.3 × H to 0.6 × H.

In Experimental Example 9, steam aging with high efficiency could not be performed. Presumably because the slag injection holes were clogged and the main pipes were physically damaged because the injection holes were formed in the main piping and arranged in the height direction region higher than 0.6 × H. Is done.
Moreover, at the time of regular inspections, it was confirmed that nozzle clogging occurred in the ejection holes. In particular, it is surmised that this nozzle clogging of the ejection holes has lowered the efficiency of steam aging.

  The present invention as described above is not limited to steelmaking slag having a high blending ratio of powdery substances, but can also be applied to steelmaking slag having a particle size comparable to that of a conventional roadbed material.

DESCRIPTION OF SYMBOLS 1 Steam aging apparatus 11 Slag storage container 111 A pair of storage member 111a Bottom surface 111b First inclined surface 111c Side surface 111d Second inclined surface 111e End surface 112 Support member 112a Column part 112b Shaft alpha storage area 12 Pressure vessel 12a Opening lid 13 First piping 14 Second piping 14a Main pipe portion 14b Branch pipe portion 14ba Ejection hole 14c Expanded diameter portion 14d Connection pipe portion 50 Pressurized steam supply device 51 Valve 52 Piping

Claims (10)

A steelmaking slag pressurized steam aging device for aging steelmaking slag by pressurized steam,
A slag storage container into which the steelmaking slag is charged, and
A pressure container for housing the slag storage container;
A first pipe provided outside the pressure vessel and supplying the pressurized steam to the inside of the pressure vessel;
A second pipe that is provided inside the pressure vessel and supplies the pressurized steam to the inside of the slag storage vessel;
With
The second pipe is provided with a main pipe portion provided in the slag storage container along the horizontal direction, and a jet hole that is provided to rise upward from the main pipe portion and jets the pressurized steam on a side surface. A formed branch pipe part,
When the dimension in the height direction of the storage area of the slag storage container is H (mm), the ejection holes are arranged in a height direction area of 0.3 × H to 0.6 × H in the storage area. A pressurized steam aging device characterized by that. The said 2nd piping is further provided with the enlarged diameter part which has an outer diameter larger than the outer diameter of the said branch pipe part above the said ejection hole of the said branch pipe part. Pressure steam aging device. The pressurized steam aging apparatus according to claim 2, wherein the enlarged diameter portion is provided at a tip of the branch pipe portion. 4. The additive according to claim 2, wherein D ≧ 2 × d is satisfied, where D (mm) is an outer diameter of the enlarged diameter portion and d (mm) is an outer diameter of the branch pipe portion. Pressure steam aging device. The inclination angle from the horizontal line of the line connecting the center point of the ejection hole and the position closest to the center point of the ejection hole among the edges of the lower surface of the enlarged diameter portion is 45 ° or less, The pressurized steam aging device according to any one of claims 2 to 4. L1 ≦ d is satisfied, where L1 (mm) is the separation distance between the lower end of the enlarged diameter portion and the center point of the ejection hole, and d (mm) is the outer diameter of the branch pipe portion. The pressurized steam aging device according to any one of claims 2 to 5. When the longitudinal dimension of the storage area of the slag storage container is L (mm), the ejection holes are arranged in the longitudinal area of 0.2 × L to 0.8 × L in the storage area. The pressurized vapor aging device according to any one of claims 1 to 6, wherein When the dimension in the width direction of the storage area of the slag storage container is W, the ejection holes are arranged in a width direction area of 0.2 × W to 0.8 × W in the storage area. The pressurized steam aging device according to any one of claims 1 to 7. The pressurized steam aging device according to any one of claims 1 to 8, wherein a plurality of the ejection holes are provided in a circumferential direction of the branch pipe portion. The pressurized steam aging device according to any one of claims 1 to 9, wherein a plurality of the ejection holes are provided in a height direction of the branch pipe portion.

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