JP6184933B2 - Furnace bottom split type converter - Google Patents

Description

  The present invention relates to a furnace bottom split type converter.

  Converter blowing is performed by supplying oxygen into the furnace body in which the hot metal is stored. At this time, from the viewpoint of improving the processing capacity of the converter by stirring the hot metal inside the furnace body, and from the viewpoint of quickly melting the iron scrap charged into the furnace body together with the hot metal, gas is blown from the bottom of the furnace body. A furnace body having a structure for stirring hot metal is generally used.

  The furnace body of the converter is lined with a refractory (brick), but the refractory is worn over time due to the operation of the converter. The wear of the refractory is not uniform in the furnace, and the wear of the bottom of the furnace including the part where the stirring gas flows and the part contacting the iron scrap when the iron scrap is charged is fast.

  When the wear of the refractory reaches the limit, the refractory (brick) is exchanged over the entire range of the converter, that is, the construction of the brick is rebuilt. At this time, the bricks whose wear has not reached the limit are dismantled and new bricks are reloaded. In addition, such a furnace construction over the entire range of the furnace body takes a long time for construction, and the converter cannot be operated during that period.

  Therefore, the bottom of the converter furnace body is provided so as to be split, and a plurality of such bottoms are prepared. This makes it possible to pre-load new bricks offline in advance in the furnace bottom unit that is not attached to the converter body, shortening the brick loading time of the entire converter furnace body, The converter operating time can be increased by the shortened time. In order to increase the number of bricks to be stacked offline in advance and reduce the number of bricks to be reloaded in the furnace construction, design guidelines for increasing the furnace bottom unit as much as possible have become common.

  As described above, Patent Documents 1 and 2 disclose a furnace bottom split type converter in which the bottom of the furnace where the wear of the refractory is fast is divided and provided as a furnace bottom unit and the furnace bottom unit is replaceable. Yes. By making the furnace bottom unit replaceable in this way, not only the effect of shortening the brick loading time of the entire furnace body as described above, but also when only the refractory of the furnace bottom unit is partially worn, By exchanging only the furnace bottom unit, after the refractory of the entire furnace body has been used up to a more evenly worn state, the construction work can be performed, reducing the frequency of the construction work itself. The effect that it can be performed can also be produced.

Japanese Utility Model Publication No. 1-58647 JP-A-8-60222

  However, the larger the size of the furnace bottom unit, the higher the construction difficulty when attaching the furnace bottom unit, and the longer the replacement time.

  The present invention has been made in view of such circumstances, and while reducing the size of the separable bottom unit as much as possible, reducing the long-time work that is difficult when replacing the bottom unit. It is an object of the present invention to provide a furnace bottom split type converter that can be used.

In order to solve the above problems, the present invention provides the following (1) to ( 6 ).

(1) A split bottom converter having a split bottom furnace unit having a furnace body mounted on the bottom;
The furnace bottom unit includes a first furnace bottom member constituting an outer part, and at least one second furnace bottom member constituting an inner part and detachably attached to the first furnace bottom member. Yes, and
The first furnace bottom member and the second furnace bottom member respectively include a first tuyere group and a second tuyere group for blowing a stirring gas into the furnace,
The first furnace bottom member and the second furnace bottom member are fastened by a flange portion,
The furnace bottom split-type converter , wherein the first dock for the first tuyere group is provided integrally with the flange portion of the first furnace bottom member.

( 2 ) The furnace bottom split type converter according to (1) , wherein the first dock is provided in an annular shape along a web of a flange portion of the first furnace bottom member.

( 3 ) The furnace bottom split-type roll according to (1) or (2) , wherein the first pipe is disposed above a flange of a flange portion of the first furnace bottom member. Furnace.

( 4 ) The second furnace bottom member is in a central portion of the furnace bottom,
The furnace bottom according to any one of (1) to (3) , wherein the second dock for the second tuyere group is provided in a central portion of the second furnace bottom member. Split type converter.

( 5 ) The supply of the stirring gas to the second pipe is performed from the first pipe,
The furnace bottom split-type roll according to (4) , wherein the first pipe is provided on a flange portion of the first furnace bottom member on the second furnace bottom member side. Furnace.

( 6 ) The piping connecting the first and second headers includes a flange web on the first furnace bottom member side of the first furnace bottom member, and the second The furnace bottom split-type converter according to (5) , characterized in that two furnace bottom members are disposed so as to pass through a web of a flange portion on the first furnace bottom unit side.

  According to the present invention, while maintaining the effect of increasing the size of the furnace bottom unit that can be divided and shortening the furnace building time, it is possible to perform a long-time operation with high difficulty when replacing the furnace bottom unit. Can be reduced.

FIG. 1 is a cross-sectional view schematically showing an example of a furnace bottom split type converter according to an embodiment of the present invention. FIG. 2 is an enlarged cross-sectional view of the bottom of the furnace body. FIG. 3 is a plan view schematically showing gas piping provided in the first and second furnace bottom units 7 and 8. FIG. 4A is a cross-sectional view showing a divided state of the bottom split type converter according to one embodiment. FIG. 4B is a cross-sectional view showing a divided state of the bottom split type converter according to one embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view schematically showing an example of a furnace bottom split type converter according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view showing the bottom of the furnace body.

  As shown in FIGS. 1 and 2, a furnace bottom split type converter 100 according to an embodiment includes a bottomed cylindrical furnace body 1. Hot metal is stored in the furnace body 1 and further iron scrap is charged. The furnace body 1 is provided with a tilting shaft 2 for tilting the furnace body 1. The tilt shaft 2 is rotatably supported by support columns 3a and 3b. A gear box 4 having a built-in gear is provided on one end side of the tilt shaft 2. Inside the gear box 4, a gear 4a connected to one end of the tilt shaft 2 and a gear 4b for driving the gear 4a are provided. The gear 4 b is connected to one end of the drive shaft 6 of the drive device 5. The driving device 5 rotates the driving shaft 6 and transmits this rotational force to the tilting shaft 2 via the gears 4b and 4a. Thereby, the drive device 5 tilts the furnace body 1.

  The furnace bottom of the furnace body 1 is configured by mounting a separable furnace bottom unit 20. The furnace bottom unit 20 constitutes an outer part, and forms a ring-shaped first furnace bottom member 7, and constitutes an inner part of the furnace bottom unit 20, and is attached to the first furnace bottom member 7 in a separable manner. 2 furnace bottom members 8. The second furnace bottom member 8 is located at the center of the furnace bottom.

  The first furnace bottom member 7 is fastened to a portion other than the furnace bottom of the furnace body 1 by a flange portion 9. Further, the second furnace bottom member 8 is fastened to the first furnace bottom member 7 by a flange portion 10.

  The flange portion 9 includes a web 9a attached to a portion other than the furnace bottom unit of the furnace body 1, a furnace body side flange 9b provided on the web 9a, and a web 9c attached to the first furnace bottom member 7. And a first furnace bottom member side flange 9d provided on the web 9c (see FIG. 2). The lower surface of the first furnace bottom member side flange 9d is placed on the upper surface of the furnace body side flange 9b, and both flanges are fastened by a fastening member (not shown) such as a bolt. Accordingly, the first furnace bottom member 7 is fastened to a portion other than the furnace bottom unit of the furnace body 1. Further, when the bolt is removed, the first furnace bottom member 7 can be removed from a portion other than the furnace bottom unit of the furnace body 1.

  Similarly, the flange portion 10 is attached to the web 10a attached to the first furnace bottom member 7, the first furnace bottom member side flange 10b provided on the web 10a, and the second furnace bottom member 8. And a second furnace bottom member side flange 10d provided on the web 10c (see FIG. 2). With the lower surface of the second furnace bottom member side flange 10d placed on the upper surface of the first furnace bottom member side flange 10b, both flanges are fastened with bolts (not shown). Thereby, the second furnace bottom member 8 is fastened to the first furnace bottom member 7, and the second furnace bottom member 8 can be detached from the first furnace bottom member 7 by removing the bolt.

  The furnace body 1 is configured such that bricks 11 (11a to 11c), which are refractories, are lined on the inner side of an iron shell constituting an outer shell. The first furnace bottom member 7 includes a brick 11a, the second furnace bottom member 8 includes a brick 11b, and a portion other than the furnace bottom unit 20 of the furnace body 1 includes a brick 11c.

  The furnace bottom split type converter 100 is typically an upper bottom blown type converter. That is, a lance for blowing oxygen gas to the molten iron is inserted from the upper opening of the furnace body 1, and stirring gas such as argon gas is blown into the molten iron in the furnace body 1 from the furnace bottom. For this reason, the first furnace bottom member 7 has a plurality of tuyere 12a for blowing the stirring gas for stirring the hot metal from the furnace bottom, and the second furnace bottom member 8 also has a plurality of similar tuyere 12b. doing. The tuyere 12a and 12b penetrate the bricks 11a and 11b from the furnace bottom side, respectively, and reach the furnace. Stir gas is supplied to the tuyere 12a, 12b from a stir gas supply mechanism (not shown) through a stir gas supply pipe 13.

  FIG. 3 is a plan view schematically showing gas piping provided on the first furnace bottom member 7 and the second furnace bottom member 8 of the furnace bottom unit 20.

  As shown in FIG. 3, in the 2nd furnace bottom member 8 located in the center part of a furnace bottom, the header 14 is arrange | positioned in the center part. A stirring gas supply pipe 13 is connected to the pipe 14. The nozzle 14 and the plurality of tuyere 12b are connected by stirring gas distribution pipes 15a to 15d that connect the nozzle 14 and each tuyere 12b, respectively. In this example, the tuyere connected to the nozzle 14 is only the tuyere 12b provided in the second furnace bottom member 8, and the arrangement of the stirring gas distribution pipes 15a to 15d is the second furnace bottom member 8 Only complete. The stirring gas supply pipe 13 passes through the webs 10a and 10c of the flange portion 10 (see FIG. 2).

  In the first furnace bottom member 7 disposed around the second furnace bottom member 8, the header 16 is disposed separately from the header 14. In the present embodiment, the header 16 is disposed integrally with the flange portion 10 along the flange portion 10 that is a boundary portion between the first furnace bottom member 7 and the second furnace bottom member 8. Specifically, the header 16 is integrally disposed along the web 10a attached to the first furnace bottom member 7 in the flange portion 10 (see FIG. 2). The nozzle 16 is disposed above the flanges 10 b and 10 d of the flange portion 10.

  The pipe 16 is annular along the flange portion 10, and the stirring gas supply pipe 13 is connected to the annular pipe 16. The stirring gas supply pipe 13 is connected to an annular nozzle 16 through a web 9a, 9c of the flange portion 9 from a stirring gas supply mechanism (not shown) so as not to exceed the flange portion 9. The nozzle 16 is connected to each of the plurality of tuyere 12a by stirring gas distribution pipes 17a to 17h. The cross-sectional shape of the nozzle 16 is L-shaped, and the outer wall surfaces of the web 10 a and the first furnace bottom member 7 also serve as the side wall of the nozzle 16. Thereby, the installation space of the header 16 can be made small. Of course, the cross section of the header 16 may be C-shaped, and the web 10a may also serve as one side wall of the header 16, or the header 16 itself may be formed in a cylindrical shape.

  In addition, the pipe 16 also relays the stirring gas supply pipe 13 to the pipe 14 of the second furnace bottom member 8. That is, the stirring gas supply pipe 13 connected to the pipe 14 of the second furnace bottom member 8 is connected to the pipe 16, and the stirring gas is supplied to the pipe 14 via the pipe 16.

  The nozzle 16 may be provided on the flange portion 9 side, but is preferably provided on the flange portion 10 side. By providing the nozzle 16 on the flange 10 side, the stirring gas flows from the nozzle 16 so as to rise along the arc at the bottom of the furnace, and the stirring gas can be easily controlled.

  Next, the split / replacement operation of the bottom unit in the bottom split type converter 100 will be described.

  4A and 4B are cross-sectional views showing the division / replacement operation of the bottom unit of the bottom split-type converter 100 according to one embodiment.

  In this embodiment, the furnace bottom unit 20 constituting the furnace bottom of the furnace body 1 has a mode in which the first furnace bottom member 7 and the second furnace bottom member 8 are integrally divided, and the second furnace bottom member. It is possible to divide in two modes, where only 8 are divided.

  When only the second furnace bottom member 8 corresponding to the center part of the furnace bottom is divided / replaced from the furnace bottom unit 20 of the furnace body 1, as shown in FIG. 4A, the first furnace bottom member 7 is used as the furnace. After the second furnace bottom member 8 is divided and removed from the first furnace bottom member 7 in a state where it is still mounted on the bottom, another second brick 11b previously loaded with off-line work is added. The furnace bottom member 8 is transferred below the first furnace bottom member 7 and attached to the central portion of the first furnace bottom member 7.

  When the entire furnace bottom unit 20 is divided, as shown in FIG. 4B, the entire furnace bottom unit 20, that is, the first furnace bottom member 7 and the second furnace bottom member 8 are separated from the furnace bottom of the furnace body 1. After dividing and removing, the furnace bottom unit 20 comprising the new first furnace bottom member 7 and the second furnace bottom member 8 on which new bricks 11a and 11b are previously loaded in an off-line operation is replaced with the furnace of the furnace body 1. The furnace body 1 is formed by being transferred and mounted under a portion other than the bottom unit.

  If the furnace bottom unit is made larger and divided as before, when the refractory (brick) at the center of the furnace bottom, which is most likely to wear out, wears out, the entire furnace bottom unit is divided and replaced. Each time, there is a disadvantage that the construction difficulty level when attaching the furnace bottom unit is high and the replacement time is long.

  On the other hand, in this embodiment, when the brick 11b of the second furnace bottom member 8 in the center part of the furnace bottom which is most easily worn out is worn out, the center of the furnace bottom from the furnace bottom unit 20 of the furnace body 1 is used. Since it is only necessary to remove and replace the second furnace bottom member 8 having a small diameter corresponding to the portion, the construction is easier and safer than the case where the entire furnace bottom unit 20 is divided and replaced. Short work time is enough. For this reason, the conventional inconvenience that the construction difficulty level when attaching the furnace bottom unit is high and the replacement time is long does not occur.

  In addition, since the brick 11a of the first furnace bottom member 7 is normally usable even when the brick 11b of the second furnace bottom member 8 is worn out, only the second furnace bottom member 8 is replaced. Further, the entire furnace bottom unit 20 may be removed and replaced when the brick 11a of the first furnace bottom member 7 that can be further operated and is easily worn out next is worn out. For this reason, the work itself which replaces the whole large-sized furnace bottom unit 20 with a high construction difficulty level and a long time can be reduced.

  Furthermore, since the brick 11c of the part other than the furnace bottom unit 20 of the furnace body 1 is normally usable even when the brick 11a of the first furnace bottom member 7 is worn out, the entire furnace bottom unit 20 is replaced. After that, when the operation is possible and the brick 11c is also worn out, a furnace construction (converter furnace repair work) is performed in which bricks are reloaded. Therefore, since the furnace construction may be performed after the replacement of only the second furnace bottom member 8 and the replacement of the entire furnace bottom unit 20, the converter furnace repair pitch can be remarkably increased.

  Furthermore, since the inconvenience caused by increasing the size of the furnace bottom unit 20 itself so that the second furnace bottom member 8 can be divided is eliminated, the diameter of the furnace bottom unit 20 (first furnace bottom member 7) is increased. It is possible to maintain the effect of reducing the time required for the construction work by reducing the number of bricks to be reloaded during the construction work.

  As described above, according to the split bottom converter according to the present embodiment, the bottom unit can be replaced while maintaining the effect of increasing the size of the split bottom unit and shortening the furnace building time. In this case, it is possible to reduce long-time work with high difficulty. Moreover, there is an effect that the converter furnace repair pitch can be further increased.

  By the way, in this embodiment, the furnace bottom unit 20 which comprises the furnace bottom of the furnace body 1 is the mode in which the 1st furnace bottom member 7 and the 2nd furnace bottom member 8 are divided | segmented integrally, and 2nd furnace. Since only the bottom member 8 can be divided in two modes, the stirring gas supply pipe and the stirring gas pipe provided in the first furnace bottom member 7 and the second furnace bottom member 8 are divided. Further, it is necessary to devise arrangement of gas pipes such as a stirring gas distribution pipe. For example, in particular, when the gas pipe is disposed across the flange portion 10 that is a boundary portion between the first furnace bottom member 7 and the second furnace bottom member 8, conventionally, the gas pipe is disposed below the flange portion 10. It is necessary to arrange in the position, which leads to an increase in the turning radius when the furnace body 1 is tilted. When the turning radius is increased, the furnace body 1 may interfere with existing equipment and an existing steel receiving cart that transports the furnace body 1.

  Further, when the number of gas pipes that need to be arranged across the flange portions 9 and 10 increases, it takes a long time to remove or separate the gas pipes when the furnace bottom is divided.

  In contrast, in the present embodiment, as shown in FIG. 3, the tuyere connected to the header 14 of the second furnace bottom member 8 is only the tuyere 12 b provided on the second furnace bottom member 8. The arrangement of the stirring gas distribution pipes 15a to 15d is completed only by the second furnace bottom member 8, and the tuyere connected to the annular header 16 of the first furnace bottom member 7 is Only the tuyere 12a provided in one furnace bottom member 7 is used, and the arrangement of the stirring gas distribution pipes 17a to 17h is completed only by the first furnace bottom member 7. For this reason, the stirring gas distribution pipes 15a to 15d do not exceed the flange portion 10 that is a boundary portion between the first furnace bottom member 7 and the second furnace bottom member 8, and the stirring gas distribution pipes 17a to 17h. Also, the flange portion 9 that is a boundary portion between the first furnace bottom member 7 and the portion other than the furnace bottom unit 20 of the furnace body 1 is not exceeded. Therefore, when removing the second furnace bottom member 8 from the first furnace bottom member 7 and when removing the entire furnace bottom unit 20, there is no need to remove the stirring gas distribution pipe or to perform the separation work. Only the removal work or the separation work of the gas supply pipe 13 is required. Thereby, the removal or separation of the gas pipe can be completed in a short time.

  The first furnace bottom member 16 is disposed along the flange portion 10 which is a boundary portion between the first furnace bottom member 7 and the second furnace bottom member 8, specifically, the flange portion 10. Among these, since the flange portion 10 is integrally disposed along the web 10 a attached to the first furnace bottom member 7, the header 16 and the pipe can be disposed above the flanges 10 b and 10 d. For this reason, there is room in the plane space of the first furnace bottom member 7 and the height dimension of the furnace bottom unit 20 can be reduced, so that the turning radius of the furnace body 1 can be reduced.

  Further, the second furnace bottom member 8 and the first furnace bottom member 7 are respectively provided with a header 14 and a header 16, and the header 14 of the second furnace bottom member 8 is provided with the first furnace bottom member 7. Since the stirring gas is supplied via the pipe 16 and the relay arranged at the outside is relayed, the stirring gas is sent to the pipe at the central portion. In this case, it is not necessary to provide each of the stirring gas supply pipes, and the gas piping can be prevented from becoming complicated.

  When the first furnace bottom member 7 is not provided with a nozzle and only the header 14 of the second furnace bottom member 8 is provided, the stirring gas distribution pipes 17a to 17h connected to the tuyere 12a are Although the interference of the stirring gas distribution pipes 15a to 15d connected to the port 12b may complicate the gas pipe and restrict the layout and position of the tuyere 12a, the first furnace bottom unit 7 By further providing an annular pipe 16, the pipe 16 and the stirring gas distribution pipes 17 a to 17 h provided in the first furnace bottom unit 7 outside the second furnace bottom unit 8 It is also possible to obtain an advantage that the degree of freedom in layout increases with respect to the position and number of the tuyere 12a without receiving interference of the pipes 15a to 15d.

  The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. For example, in the above-described embodiment, the upper bottom blowing converter has been described as an example, but the present invention can also be applied to a bottom blowing converter in which oxygen is blown from the furnace bottom.

  Moreover, although the case where the furnace bottom unit can be divided into the first furnace bottom member and the second furnace bottom member has been described in the above embodiment, the number of divisions of the furnace bottom unit may be three or more.

DESCRIPTION OF SYMBOLS 1 Furnace 2 Tilt shaft 3a, 3b Support pillar 4 Gear box 4a, 4b Gear 5 Drive device 6 Drive shaft 7 1st furnace bottom member 8 2nd furnace bottom member 9, 10 Flange parts 9a, 9c, 10a, 10c Web 9b, 9d, 10b, 10d Flange 11a, 11b, 11c Brick 12a, 12b Tuyere 13 Stirring gas supply pipe 14 Nozzle 15a-15d Stirring gas distribution pipe 16 Nozzle 17a-17h Stirring gas distribution pipe 20 Furnace bottom unit 100 Furnace bottom split type converter

Claims (6)

A split bottom converter having a furnace body in which a split bottom unit is mounted on the bottom,
The furnace bottom unit includes a first furnace bottom member constituting an outer part, and at least one second furnace bottom member constituting an inner part and detachably attached to the first furnace bottom member. Yes, and
The first furnace bottom member and the second furnace bottom member respectively include a first tuyere group and a second tuyere group for blowing a stirring gas into the furnace,
The first furnace bottom member and the second furnace bottom member are fastened by a flange portion,
The furnace bottom split-type converter , wherein the first dock for the first tuyere group is provided integrally with the flange portion of the first furnace bottom member. 2. The furnace bottom split type converter according to claim 1, wherein the first header is provided in an annular shape along a web of a flange portion of the first furnace bottom member. The furnace bottom split-type converter according to claim 1 or 2 , wherein the first header is disposed above a flange of a flange portion of the first furnace bottom member. The second furnace bottom member is in a central portion of the furnace bottom;
It said second KanYadoriki for the second tuyere groups, according to any one of claims 1 to 3, characterized in that provided in the central portion of the second furnace bottom member Furnace bottom split type converter. The supply of the stirring gas to the second pipe is performed from the first pipe,
5. The furnace bottom split type rolling according to claim 4 , wherein the first pipe is provided on a flange portion of the first furnace bottom member on the second furnace bottom member side. Furnace. The pipe connecting the first and second headers includes a flange web on the second furnace bottom member side of the first furnace bottom member, and the second furnace. 6. The furnace bottom split-type converter according to claim 5 , wherein a bottom member is disposed so as to penetrate a web of a flange portion on the first furnace bottom unit side.

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