JP2011528065A - A device for inserting and extracting a fuel injection lance from the tuyeres of a blast furnace - Google Patents

Abstract

  An insertion / extraction device for inserting / extracting a fuel injection lance (10) into / from a tuyere (1) of a blast furnace, particularly a blast furnace, is presented. The tuyere body (1) comprises a lance sheath body (12) defining an insertion / extraction shaft (49), the lance sheath body being a coaxial extension of the lance line through which the injection lance is inserted into the tuyere body. It is attached to. The presentation device includes a linear guide (22), a carriage (24) and a mounting support (50). The carriage is movably supported by a linear guide, and cooperates with the coupling device (42) to couple the ejection lance to the carriage so that the ejection lance can move axially along the translation axis by the carriage. The linear guide includes a mechanism (36, 38) for linearly moving the carriage along the guide shaft (35), and a first connector half (64) that attaches the linear guide to the mounting support attached to the tuyere. , 65, 66). The mounting support (50) cooperates with the first coupler halves (64, 65, 66) of the linear guide to detachably mount the linear guide to the tuyere (57). 58, 62). The mounting support (50) and these coupler halves (57, 58, 62, 64, 65, 66) are used as the mounting linear guide, and the guide shaft (35) of the linear guide is used as the insertion / extraction shaft (49). Oriented so that the translational axis of the injection lance (10) which is parallel and connected to the carriage (24) is coaxial with the insertion / extraction axis (49).

Description

  The present invention generally relates to an apparatus for a fuel injection lance for a blast furnace tuyere. More particularly, the present invention relates to a procedure for inserting and withdrawing a fuel injection lance, particularly an oxygen charcoal lance, into the tuyere.

  A fuel injection lance is used to inject combustible material, such as pulverized coal, into hot air that is directed through a tuyere to a blast furnace. Such lances are for maintenance and repair purposes, and lances need to be replaced periodically if, for example, the tip is over worn and broken as a result of combustion and wear.

  At present, standard replacement procedures for fuel injection lances, i.e. removal of lances that require repair and insertion of new or refurbished lances, require manual intervention by three to four human operators. According to this standard procedure, all human operators connect, disconnect, extract, insert and connect lances with manual labor.

  Because of the size of the injection lance (see lance size ratio for human operator shown in FIG. 2) and considerable weight, and due to the requirement for proper alignment, both lance insertion and withdrawal are relatively inefficient, and It takes time. The time it takes to replace the injection lances depends on the number of tuyeres, especially in a standard blast furnace plant, and given the increased intervention required due to the fact that several tulles may accompany each tuyere, The unpleasant problem is that people are continuously exposed to the harsh environment.

The above problem becomes even more pronounced in the case of oxygen coal injection lances that are finding increasingly wider applications today because of the advantage that pulverized coal and oxygen can be injected into hot air simultaneously. This is because the oxycarbon lance is heavier and larger in diameter than a normal lance. Due to the larger diameter, the force required to fit the oxycoal injection lance against the force exerted by hot air pressure (typically 4 to bar) can exceed 400N, so the current operation to replace the oxycoal injection lance Is even more troublesome and time consuming.
Korean patent application KR1020040019479 discloses an apparatus designed to draw a pulverized coal injection lance from a tuyere. This device includes a guide frame and a lance holder that is movable in the longitudinal direction along the guide frame by a chain drive. The guide frame is supported on the small transport vehicle by a device capable of adjusting the inclination angle of the guide frame by a motor. The device according to KR1020040019479 is further configured to correct a bent jet lance during insertion, and for this purpose includes a lance correction frame secured to one end of the guide frame. For correction, when the jet lance is pulled out by driving the lance holder, the lance passes through the lance correction frame. Although such a device facilitates removal of the injection lance, insertion is not particularly facilitated.

KR1020040019479

  In view of the above situation, an object of the present invention is to provide a solution that enables quick and reliable replacement of a fuel injection lance with respect to a tuyere by facilitating insertion and extraction.

  The device according to claim 1 is designed so that the fuel injection lance is inserted into and removed from the tuyere of a blast furnace, in particular a blast furnace. The tuyere includes a lance sheath or lance holder that defines an insertion / extraction shaft with which the lance is to be aligned for insertion / extraction. The lance sheath or lance holder is attached to a coaxial extension of the lance passage through the blow tube or tuyere tuyere and through which the jet lance is inserted into the tuyere for injection of combustible material into the hot air.

  The provided device basically comprises a linear guide and a carriage guided thereby, which comprises a mechanism for moving the carriage. The provided apparatus also includes an attachment support for removably attaching the linear guide to the tuyere.

  In other words, the carriage is movably supported by the linear guide, and in cooperation with the connecting device, the injection lance can move along the translation axis, more precisely, on the translation axis in the axial direction. Connect to Therefore, the mechanism in the linear guide is configured to linearly move the carriage on the guide shaft along the guide shaft. As defined in claim 1, the linear guide has a first coupler half that attaches the linear guide to the tuyere and the mounting support cooperates to detachably attach the linear guide to the tuyere. Having a cooperating second connector half. The mounting support and both coupler halves are connected to the carriage when the guide shaft of the linear guide is parallel to the insertion / extraction shaft and is attached to the tuyere through the mounting support. The translation axis of the injection lance is oriented so that it is coaxial with the insertion / extraction axis.

  By facilitating lance alignment and enabling drive insertion and removal, the device allows for a reduction in the time required to replace the injection lance. Furthermore, the device makes it possible to reduce the number of operators required for complete manual work from the usual 3-4 to at most two.

  The mounting support preferably supports the entire weight of the attached linear guide and the connected injection lance before insertion. That is, the mounting support is preferably configured to support the mounting linear guide on the tuyere in a cantilever manner together with the connecting jet lance. Accordingly, there is no need for any further measures or means for properly mounting and supporting the guide and the injection lance other than attaching the linear guide to the mounting support and connecting the injection lance to the guide.

  In a preferred embodiment, the mechanism in the linear guide is configured to avoid unnecessary linear movement of the carriage along the guide axis and to self-lock in the axial direction so that the carriage cannot be driven by forces external to the mechanism. This embodiment increases safety because it prevents the risk of lance discharge due to hot air pressure during the time during which the injection lance is secured to the device only during insertion and extraction.

  According to a reliable and straightforward embodiment, the linear guide mechanism is a spindle driven linear transmission. In this embodiment, the mechanism comprises a main shaft (spindle) that is rotatably mounted around the guide shaft inside the linear guide. The carriage includes a spindle nut that engages with the spindle and is attached to the carriage and linearly moves the carriage by rotation of the spindle. Preferably, the self-locking spindle device is used by selecting a combination of materials (a spindle and a spindle nut) and a lead angle of the spindle. In an alternative embodiment, the mechanism consists of a chain drive or rack-pinion gear and the carriage is suitably connected to a chain, belt or pinion, and the carriage can be linearly driven by actuating the drive or gear. In this case as well, the mechanism is advantageously self-locking, eg preventing the lance from being removed by associating a self-locking brake with a drive such as a self-locking worm gear. An actuator can be permanently or removably connected to the mechanism to actuate the carriage and thereby translate the lance.

  Preferably, the first connector half and the second connector half (each of the linear guide and the mounting support) constitute a quick-acting fastener so that the linear guide is attached to the tuyere and the tuyere. Can be removed from. In the latter case, the quick-actuated fastener is preferably a lever-actuated fastening stirrup that may be placed in either the first coupler half or the second coupler half, and the second coupler half or the second coupler half. It is preferable to provide a cooperating hook that can be arranged in each of the one connecting halves, and to attach the linear guide to the mounting support. Further, in this embodiment, the apparatus further includes a stud on either one of the two connector halves and a pawl on the other connector half, the pawl engaging the stud and straight on the mounting support. The guide may be blocked.

  In the installed state, the mounting support is permanently or removably secured to the tuyere, in particular the lance sheath. Preferably, the second connector half comprises a connecting part, in particular a connecting plate. The connecting plate defines a connecting surface that is substantially perpendicular to the insertion / extraction shaft defined by the lance sheath in a simple but not strictly necessary configuration. Correspondingly, the first connector half preferably comprises, in simple construction, a complementary connecting part, in particular a complementary connecting plate, which defines a complementary connecting surface perpendicular to the guide axis. The latter embodiment presents a simple solution that provides intrinsic alignment as described above.

  The apparatus advantageously comprises a separate coupling device for coupling the injection lances to the carriage, so that a dedicated coupling device can be attached to each injection lance, thus allowing further time savings. In a simple configuration, the carriage includes a first connecting portion, and the connecting device includes a second connecting portion connectable to the first connecting portion. In the latter case, the coupling device preferably fixes the injection lance radially and axially so that the injection lance can be moved axially on the translation axis by the carriage when the first and second coupling parts are engaged. It has a color to make.

  Preferably, the linear guide comprises at least one elongate beam defining a linear track and a carriage movably supported on the linear track of the beam, for example by a roller device or a sliding guide.

  Advantageously, the linear guide is dimensioned so that the carriage travel is greater than the insertion depth of the injection lance.

It will be appreciated that the apparatus of the present invention is particularly suitable for industrial application in the replacement process of fuel injection lances in blast furnace tuyeres, particularly oxygen coal injection lances.
Preferred embodiments of the present invention will now be illustrated with reference to the accompanying drawings.

1 is a side view of a conventional tuyere device according to the prior art showing a fuel injection lance in an insertion position. FIG. FIG. 2 shows the side view of FIG. 1 showing the fuel injection lance in the sampling position and showing the human operator as a dimension reference. FIG. 3 is an isometric perspective view of an apparatus according to the present invention in which a fuel injection lance is inserted into and withdrawn from a tuyere as shown in FIGS. FIG. 4 is an enlarged isometric perspective view of the apparatus of FIG. 3 in the operating position on the tuyere, showing the connection of the linear guide to the mounting support by the fast acting fastener. FIG. 4 is an enlarged isometric perspective view of the apparatus of FIG. 3 in the inoperative position with a linear guide connected and separated from the mounting support.

  Further details and advantages of the present invention will become apparent from the following detailed description.

  FIG. 1 shows a conventional tuyere identified generally by reference numeral 1. The tuyere 1 includes a tuyere 2 that forms the downstream tip of the tuyere 1, and hot air is blown into the blast furnace (not shown) through the tuyere 2. The tuyere 2 is supported inside the tuyere cooler holder 3, and the tuyere cooler holder 3 is fixed to the outer shell of the furnace and does not constitute part of the tuyere body 1. The tuyere 1 is suspended so as to be movable with respect to the furnace. The tuyere body 1 further includes a blowing tube 4 connected to the upstream side of the tuyere 2 and an elbow 5 connected to the upstream side of the blowing tube 4. The elbow 5 may include a peephole device (not shown) aligned with the tuyere 2. The tuyere elbow 5 is connected by a down leg 6 to a hot air bustle tube (not shown). Hot air is supplied from the hot air bustle pipe through the down leg 6, the elbow 5 and the blow pipe 4, that is, through the piping conduit formed by the tuyere body 1, and injected into the furnace through the tuyere 2.

  Further shown in FIG. 1 is a fuel injection lance 10 such as a pulverized coal or oxygen coal injection lance which is inserted and secured to a lance insert sheath (also referred to as a lance retainer) 12 and additionally a lance sheath 14 by means of a retaining chain 14. 12 is fixed. The lance sheath 12 itself is of any known suitable configuration, for example of a basically tubular configuration, and in particular serves as a guide for the insertion and withdrawal of the injection lance 10. The lance sheath body 12 also includes, for example, a ball valve 16 and a check valve 17 as shown in FIGS. 1 to 2 in order to prevent hot air from leaking through the lance sheath body 12 when the injection lance 10 is withdrawn. Including valve devices. For the purposes of this disclosure, the lance sheath body 12 is considered to be an integral part of the tuyere body 1 because it is fixed to the tuyere body 1 and is immovable relative thereto.

  In the specific example of FIGS. 1 and 2, the lance sheath body 12 is attached as a flange to a boss 15 projecting obliquely from the blow tube 4. The lance sheath body 12 is attached to a straight extension of a lance pipe line (not shown) passing through the boss 15 and obliquely through the wall of the blow pipe 4 so that the lance 10 can be inserted into the hot air passage inside the blow pipe 4. Yes. Alternatively, although not shown in FIGS. 1-2, the lance sheath body 12 is defined by the tuyere 2 as disclosed, for example, in US Pat. No. 5,451,034, the disclosure of which is hereby incorporated by reference. It will be appreciated that the lance 10 may be directly connected to the tuyere 2 for inserting the lance 10 into the passage. Also, although only one lance 10 and corresponding lance sheath body 12 are shown, the tuyere body 1 may further include one or more injection lances, each inserted through the corresponding lance sheath body. You will understand that too.

  FIG. 2 shows the fuel injection lance 10 in the extraction position. In a known manner, the lance 10 has a tip 18 that forms an injection nozzle and a rear end 19 that connects, for example, the lance to a pneumatic pulverized coal supply mechanism or, in the case of an oxycarbon lance, to an oxygen source. In addition, a pipe connecting portion that injects oxygen into the hot air together with pulverized coal may be provided.

  Now, turning to FIGS. 3 to 5, the insertion / extraction device for inserting the fuel injection lance 10 into the tuyere body 1 and withdrawing it from the tuyere body 1 will be described. The device, identified generally by the reference numeral 20, is designed to allow quick movement of the injection lance 10 between the insertion position shown in FIG. 1 and the extraction position shown in FIG.

  The device 20, shown fully in FIG. 3, includes a linear guide 22 whose carriage 24 is movably supported. The linear guide includes two parallel U-shaped beams 26, 28 secured by a head portion 30 and a foot portion 32 to form a bend resistant rigid hollow frame. The U-shaped beams 26 and 28 are held by a head portion 30 and a foot portion 32 so as to form a flange edge portion in parallel and close to each other at a small interval. These flanges are fixed to the head portion 30 and the foot portion 32 by, for example, screws. As can be seen in FIG. 3, the lower flanges of the U-shaped beams 26, 28 form a track that supports the four rollers 34 of the carriage 24. The linear guide 22 is provided with a mechanism for linearly guiding the carriage 24 and further imparting a linear movement along the guide shaft 35 to the carriage 24. In the embodiment shown in FIGS. 4 to 5, this mechanism extends from the head part 30 to the foot part 32, is supported rotatably around the guide shaft 35, and is disposed on the head part 30 and the foot part 32, respectively. Threaded main shaft (fixed in the axial direction by, for example, a chrysanthemum nut (not shown) of the foot portion 32 and a shoulder portion (not shown) formed by lateral rotation in the head portion 30. Spindle). The mechanism further includes a spindle nut 38 attached to the frame of the carriage 24 with a nut shaft coaxial with the guide shaft 35 and parallel to the roll direction of the roller 34. The spindle nut 38 is preferably pivotally supported on the carriage 24 so as to be pivotable at right angles to the spindle 36 and parallel to the axis of the roller 34 so as to prevent blocking of the spindle nut 38. When the main shaft 36 rotates, the carriage 24 on the guide shaft 35 translates. The stroke 37 of the carriage 24 is specified by the length of the main shaft 36, the length of the beams 26 and 28, and the distance between the head portion 30 and the foot portion 32, and is selected to slightly exceed the insertion depth of the injection lance 10. .

  Although not shown in FIG. 3, a coupler 40 is connected to the rear end of the foot portion 32, for example, a protruding portion of the main shaft 36, in order to transmit torque to the main shaft 36 by an external actuator such as an electric or pneumatic impact wrench or a crank. It will be understood that is fixed. In other words, the coupler 40 (not shown) serves to actuate a mechanism in the linear guide 22 to impart linear movement to the carriage 24. Since the device 20 is suitable for use with machine tools, it allows easy and quick insertion of an injection lance, such as an oxy-carbon lance, and for substantial hot air pressures, even if its diameter is large. .

  The main shaft mechanism in the linear guide 22 is self-locking (or irreversible), i.e. possible translation of the carriage 24 by external action (e.g. hot air pressure acting on the sealing cross section of the injection lance 10) rotates the main shaft 36. It will be understood that it is designed to prevent this, and thereby also prevents unwanted movement of the carriage 24 and thus also of the connecting injection lance 10. This is achieved by appropriate selection of the main shaft 36 and main shaft nut 38 and by selecting the main shaft 36 having a lead angle suitable for self-locking. Therefore, the force that the hot air pressure acts on the injection lance 10 that is inserted but not fixed, for example, is not pulled out. Although the main shaft mechanism is considered a more preferred embodiment, alternative mechanisms, such as a chain drive mechanism or belt drive mechanism in which the carriage is fixed to a belt or chain, or a pinion are arranged on the carriage, and the rack is on the linear guide The rack and pinion gear mechanism (fitting gear mechanism) arranged is also within the scope of the present invention. Such alternative mechanisms preferably also include an accompanying self-locking brake, such as a loosenable ratchet brake or a self-locking (irreversible) worm gear, which prevents unwanted carriage movement in the withdrawal direction.

  As can be further seen in FIG. 3, the apparatus 20 connects the injection lance 10 to a first connection 44, for example in the form of two spaced parallel bolt support brackets secured to the carriage 24, and the U-shaped beam 26. , 28 including a coupling device 42 protruding through the gap between the lower flanges. As best shown in FIG. 5, the coupling device 42 includes a collar 46 that surrounds the injection lance 10 and a second coupling 48 that is connectable to the first coupling 44 on the carriage 24, such as FIG. As shown in FIG. 4, the projecting rib includes a protruding rib having a through hole for bolt connection to the support bracket. The collar 46 is configured and arranged to fix the ejection lance 10 to the carriage 24 in the radial direction and axial direction with respect to the lance axis. The collar 46 may be configured as a clamp fixed to the injection lance 10 by screw connection as shown in FIG. 5 or welded to the injection lance 10, although in an alternative preferred variant, the collar is around the lance axis. Alternatively, it may be configured to be rotatable on the injection lance 10 with almost no play in the radial direction. In the latter modification, it is not necessary to rotate the injection lance 10 for proper connection with the carriage 24. In this latter variant, the two retaining rings may be clamped or welded to the injection lance 10 on either side close to the collar for axial fixation of the collar. It will be noted that a dedicated coupling device may be provided for each injection lance 10 to allow further time savings.

  When the injection lance 10 is connected to the carriage 24 of the installed linear guide 22 by the connecting device 42 (and when its tip 18 is inserted into the lance sheath 12), the axis of the injection lance 10 is shown in FIG. 3 is parallel to the guide shaft 35. In the latter configuration, the axis of the injection lance 10 extends through the insertion / extraction shaft 49 defined by the lance sheath 12, i.e., the injection lance 10 passes through the lance sheath 12 and through the lance passage (not shown, e.g. in the blow tube 4). It will be understood that it is essentially coincident with the axis that must be aligned without interruption because it is inserted and withdrawn, ie coaxial.

  When the linear guide 22 is attached to the tuyere body 1, for example, to the lance sheath body 12 as shown in FIG. 3, the apparatus 20 coaxially connects the injection lance 10 connected to the carriage 24 with the insertion / extraction shaft 49. It will be appreciated that it is possible to translate on a translation axis (coincident with the axis of the injection lance 10). The straight guide 22 is connected to the tuyere body 1 by a mounting support 50 as best shown in FIG. 4 which shows an enlarged view of a part of FIG. 3 (part indicated by a solid line circle).

  As can be seen in FIG. 4, the mounting support 50 of the device 20 includes two post flanges 52 that are secured to the lance sheath body 12 by means of tube fastening screw connectors 54. In an alternative equally preferred embodiment, the mounting support 50 can be permanently secured to a component of the tuyere body 1, such as the lance sheath body 12 as shown in FIGS. . The mounting support 50 further includes a connecting plate 56 supported by the column flange 52. In the illustrated embodiment, the connecting plate 56 is disposed so as to define a connecting surface 57 perpendicular to the insertion / extraction shaft 49. The mounting support 50 further includes a holding edge 58 formed integrally with the connecting plate 56 and fixed to the connecting plate 56 at the upper end thereof, and a hook 60 fixed to the top surface of the connecting support 50. A pair of pawls 62 are formed integrally with the connecting plate 58 so as to protrude sideways, and are fixed to the connecting plate. That is, the pawl 62 is provided on either side.

  As best shown in FIG. 5, the linear guide 22 includes a complementary connecting plate 64 that defines a complementary connecting surface 65 perpendicular to the guide shaft 35, i.e., the rotational axis of the main shaft 36. It will be understood that the surfaces 57, 65 need not be perpendicular to their respective axes so long as the alignment of the linear guide and thus the lance 10 is compensated. The cylindrical rod-shaped stud 66 is formed integrally with the lower side of the complementary connecting plate 64 so as to protrude laterally, and is fixed thereto. The straight guide further includes a lever 68 that is hinged to the head portion 30 and is hinged to an adjustable reach U-shaped stirrup 70, as best shown in FIG.

  The lever actuated stirrup 70 and hook 60 together form a quick actuated fastener to secure the linear guide 22 to the connecting support 50. The complementary connecting plate 64 and the stud 66 together with the stirrup 70 form a first coupler half on the linear guide 22 so that the linear guide 22 is in a predetermined orientation with the tuyere body 1, more precisely, a mounting support. It will also be appreciated that it is fixedly attached to 50 and removably attached. Correspondingly, the cooperating parts of the mounting support 50, i.e. the connecting plate 56, the pair of claws 62 and the hook 60, cooperate with the connector half on the linear guide 22 to quickly and reliably A second connector half is formed that allows for easy mounting and precise orientation. FIG. 4 best shows these connector halves in an engaged or connected arrangement, with one exemplary separation of both connector halves shown in FIG. 3-4, the pawl 62 engaging the stud 66 prevents any rotation and any lateral or downward movement of the linear guide 22 about its guide shaft 35, and the retaining edge 58 is The complementary connecting plate 64 is held upward. It will be noted that for each furnace tuyere, each access port of the injection lance 10 is preferably provided with a dedicated mounting support 50 to allow further time savings.

  Because of the geometric shape of the mounting support 50 with respect to the tuyere body 1 and its predetermined orientation, the guide shaft 35 of the linear guide 22 after installation is parallel to the insertion / extraction shaft 49 and which is connected to the linear guide 22. The axis (and translation axis) of the injection lance is also oriented to be coaxial with the insertion / extraction shaft 49 as is apparent from FIG. Thus, no time is lost to properly orient the injection lance 10 when the device 20 is in use. As is further apparent from FIG. 3, the mounting support 50 is configured to support the weight of the linear guide 22 and the connecting injection lance. Therefore, in the attachment state as shown in FIG. 3, the linear guide 22 is supported on the tuyere 1 in a cantilever manner by the attachment support 50.

The procedure for replacing the injection lance 22 by using the device 20 will be described below.
Initially, the linear guide 22 inserts the stud 66 into the pawl 62 and pivots the complementary articulating surface 64 into contact with the articulating surface 57, after which the quick-actuated fastener is closed (ie, the stirrup 70 is moved by the lever 68). By engaging with the hook 60), it is connected to the mounting support 50. Thereby, the linear guide 22 is attached to the tuyere body 1 (removably), and the guide shaft 35 is oriented parallel to the insertion / extraction shaft 49. In the next step, the carriage 24 is positioned in a position that allows the connecting device 42 of the currently inserted injection lance 10 to be serviced or discarded to be connected to the carriage. Once the injection lance 10 is fixed to the carriage 24 by the engagement of the connecting portions 44 and 48, the screw of the sleeve nut 72 of the seat 74 is loosened, and the holding chain 14 (see FIG. 1, not shown in FIGS. 3 to 5). ) Is removed. It will be appreciated that the self-locking configuration of the transition mechanism in the linear guide 22 now prevents any random discharge of the loosened injection lance. The injection lance 10 can now be removed safely and quickly by actuating the mechanism of the linear guide 22, more specifically by rotating the main shaft 36 with a mechanical wrench using the coupler 40. Once it has passed the ball valve 16, the latter is closed. A receiving bracket 76 fixed to the linear guide 22 prevents the tip 18 of the injection lance 10 that has been completely removed from dropping.

  After the used injection lance 10 has been withdrawn, a new or reground lance is inserted by the device 20. While the apparatus 20 is still installed, the new lance is connected to the carriage 24 after the previous lance is removed and the carriage 24 reaches a position close to the foot portion 32. The tip 18 of the new injection lance 10 is then placed on the catch 76. Depending on the type of coupling device 42, the tip 18 is then manually introduced into the access port of the lance-sheath body 12 in the seat 74, during which the injection lance 10 is inserted in the insertion direction by the carriage 24 upon activation of the main shaft 36. Translated. Before the tip 18 passes the ball valve 16, the latter is closed. The injection lance 10 is then fully inserted through the lance sheath 12 and lance passage (not shown) to reach its final position of the full insertion depth by the carriage 24. Once the injection lance has reached the fully inserted position, the seat 74 is closed by the sleeve nut 72 and the chain 14 (see FIG. 1) is engaged. Thereafter, the coupling device 42 can be separated from the carriage 24 and the linear guide 22 can be quickly removed from the mounting support 50 using a quick-acting fastener. The linear guide is then available for further use, for example on different mounting supports 50 at different lance positions.

1 tuyere 2 tuyere 3 tuyere cooler holder 4 blower tube 5 elbow 10 fuel injection lance 12 lance insertion sheath, exterior (lance holder)
DESCRIPTION OF SYMBOLS 14 Holding chain 15 Boss 16 Ball valve 17 Check valve 18 Tip part 19 Rear end part 20 Insertion / extraction apparatus 22 Linear guide 24 Carriage 26, 28 U-shaped beam 30 Head part 32 Foot part 34 Roller 35 Guide shaft 36 Main spindle, spindle 37 stroke 38 spindle nut 40 coupler 42 coupling device 44 first coupling portion 46 collar 48 second coupling portion 50 mounting support 52 column flange 54 tube fastening screw coupling 56 coupling plate 57 coupling surface 58 holding edge 60 hook 62 Pawl 64 Complementary connecting plate 65 Complementary connecting surface 66 Stud 68 Lever 70 U-shaped star wrap, lever actuated star wrap 72 Sleeve nut 74 Filling seat 76 Bracket

Claims (15)

A device for inserting and extracting a fuel injection lance, in particular an oxygen coal injection lance, into a tuyere of a blast furnace, particularly a blast furnace, wherein the tuyere body defines an insertion / extraction shaft. A device wherein the lance sheath is mounted on a coaxial extension of a lance passage through which an injection lance can be inserted into the tuyere, wherein the device is supported by the linear guide and the linear guide And the carriage cooperates with a coupling device to connect the injection lance to the carriage so that the injection lance can move axially along the translation axis by the carriage, and the linear guide connects the carriage to the carriage. A mechanism for linearly moving along a guide axis; and a first coupler half for attaching the linear guide to the tuyere, and cooperating with the first coupler half of the linear guide Includes a mounting support having a second coupling halves attaching removably said linear guide to said tuyere body Te,
The mounting support, the first connector half, and the second connector half are configured so that the linear guide is parallel to the guide shaft of the linear guide and the insertion / extraction shaft; An apparatus configured to be oriented so that a translational axis of an injection lance connected to the carriage is coaxial with the insertion / extraction axis when the two connector halves are engaged.   The apparatus of claim 1, wherein the mounting support is configured to support the linear guide in a cantilevered manner when the two connector halves are engaged.   3. An apparatus according to claim 1 or 2, wherein the mechanism is self-locking in the axial direction so as to avoid unnecessary linear movement of the carriage along the guide shaft.   The mechanism includes a main shaft rotatably mounted around the guide shaft in the linear guide, and includes a main shaft nut disposed on the main shaft so that the carriage moves linearly by rotation of the main shaft; 4. A device according to any one of the preceding claims, wherein the material combination of the main shaft and main shaft nut, together with the lead angle of the main shaft, is preferably chosen such that the mechanism is self-locking.   4. The mechanism according to any one of claims 1 to 3, wherein the mechanism comprises a chain drive, a belt drive or a rack and pinion gear configured to move the carriage linearly, preferably self-locking. The device described.   6. An apparatus according to any preceding claim, wherein the first connector half and the second connector half constitute a quick-acting fastener.   The quick-actuated fastener is on a lever-actuated fastening stirrup on the first coupler half or the second coupler half and on the second coupler half or the first coupler half, respectively. 7. The apparatus of claim 6, wherein the hook is adapted to attach the linear guide to the mounting support in cooperation with the fastening stirrup.   And further including a stud on the first connector half or the second connector half and a respective pawl on the second connector half or the first connector half. 8. A device according to claim 6 or 7, wherein said device is configured to engage said stud to block said linear guide on said mounting support.   The mounting support is fixed permanently or detachably to the tuyere body, in particular to the lance sheath body, and the second connector half is defined by the lance sheath body. 9. A device according to claim 1, further comprising a connecting part, in particular a connecting plate, which defines a connecting surface which is preferably perpendicular to the extraction shaft.   10. Device according to claim 9, wherein the first connector half comprises a complementary connecting part, in particular a complementary connecting plate, which defines a complementary connecting surface, preferably perpendicular to the guide shaft.   11. The device according to claim 1, further comprising a connecting device for connecting an injection lance to the carriage.   The carriage includes a first connecting portion, and the connecting device fixes the jet lance in a radial direction and an axial direction, and the jet lance is connected to the first connecting portion by the carriage. 12. The apparatus of claim 11, further comprising a second coupling portion adapted to be movable along the axis.   The apparatus according to claim 1, wherein the linear guide includes at least one longitudinal beam defining a linear track, and the carriage is movably supported on the linear track of the beam.   14. The apparatus according to claim 1, wherein a dimension of the linear guide is set such that a stroke of the carriage is larger than an insertion depth of the injection lance.   Use of the device according to any of the preceding claims for replacing a fuel injection lance, in particular an oxy-coal injection lance, at the tuyeres of a blast furnace.

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