Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D1/00—Casings; Linings; Walls; Roofs
  • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D1/00—Casings; Linings; Walls; Roofs
  • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
  • F27D1/1636—Repairing linings by projecting or spraying refractory materials on the lining
  • F27D1/1642—Repairing linings by projecting or spraying refractory materials on the lining using a gunning apparatus
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B7/00—Blast furnaces
  • C21B7/04—Blast furnaces with special refractories
  • C21B7/06—Linings for furnaces
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
  • F27B1/00—Shaft or like vertical or substantially vertical furnaces
  • F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
  • F27B1/12—Shells or casings; Supports therefor
  • F27B1/14—Arrangements of linings
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F27—FURNACES; KILNS; OVENS; RETORTS
  • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
  • F27D21/00—Arrangements of monitoring devices; Arrangements of safety devices
  • F27D21/02—Observation or illuminating devices
  • F27D2021/026—Observation or illuminating devices using a video installation

Definitions

• the present invention relates to removable equipment intended for repair work, and repair of blast furnaces, in particular by gunning, in which the load distribution is carried out by a rotating chute mounted in the louver.
• the invention also extends to a method of repairing and repairing blast furnaces of this type.
• blast furnaces generally include devices for charging and distributing the supplied materials (ore, coke and fluxes) constituted by a rotating chute which allows better distribution of these charges and therefore better regulation of the blast furnace market.
• Blast furnaces of this type require repairs or repairs to the lining or refractory lining of the walls of the top of the tank in particular. These operations may be particularly necessary when the blast furnace has worked "at the periphery” causing maximum production of cast iron but also wear of the refractory lining which is very significantly greater than during a central operation of the apparatus.
• Document US-A-4 253 646 discloses a device for repairing the refractory lining of a blast furnace, which comprises a horizontal fixing device which can be introduced into a lateral opening adjacent to the upper end of the top furnace and which carries a first rotary and pivotable arm to which is articulated a second arm provided at its free end with a projection nozzle.
• the device described nevertheless includes complicated and expensive drive mechanisms for controlling the various movements of the arms.
• the above-mentioned device is intended to be introduced laterally into the blast furnace, through an opening in the wall, and cannot be used for access from above.
• the device described therein is more particularly suitable for the repair of converters which are substantially different from blast furnaces.
• the device described in the aforementioned document could not find an application in a blast furnace with a revolving chute and, consequently, another more suitable solution had to be sought to support and guide the projection head of a conventional type.
• the present invention aims to provide equipment and a method for carrying out emergency operations of extremely rapid repair and repair of a blast furnace while avoiding the need to introduce operators into the blast furnace.
• the object of the invention is also to allow, in particular, to carry out the necessary repairs and repairs without having to wait for the complete cooling of the blast furnace, which, of course, saves considerable time.
• Another object of the present invention is to provide a new device or equipment of the aforementioned type which is suitable for a blast furnace equipped with a rotating chute, but which does not have the drawbacks of the known devices introduced laterally into the blast furnace.
• equipment comprising a controlled telescopic projection lance which is mounted on the rotating chute (namely in this one or outside thereof), "which can be deployed in order to reach, under the combined effect of the rotation and the inclination of the chute and its deployment, all the points of the blast furnace requiring treatment.
• the principle on which the invention is based is therefore to combine two movements specific to the rotating chute , namely rotation and inclination with a clean movement of the lance, namely deployment, in order to be able without human intervention in the interior of the blast furnace to carry out the necessary operations.
• These operations can of course be observed by an external operator using conventional devices, in particular at least one camera and a display screen arranged outside the blast furnace.
• the deployment of the telescopic lance is ensured under its own weight, one. restraining force being exerted by a cable controlled from the outside.
• Other devices are of course conceivable.
• the telescopic lance preferably consists of tubes with a square section and has, outside the lance, a curved projection head.
• tubes are housed the conduits bringing to the projection head suitable materials such as that of the dry refractory material and water in the case where it is desired to carry out a refractory gunning.
• the lance can of course also be used to spray other fluids or chemicals.
• Said lance can also be adapted for the projection of refractory materials put in a state of prefusion at the exit of the projection nozzle and this by various techniques, in particular by plasma, incandescence by exothermy, or blowtorch.
• said lance is attached to the stiffening elements of the chute which brace the upper edges of the chute.
• a product for repairing or repairing a blast furnace comprising a rotating chute, characterized in that equipment of the type described in the chute is fitted and provides the repair treatment or desired repair by associating with the proper movements of the chute, a deployment movement of the lance.
• the refection or repair treatment is provided by working from top to bottom in the tank of the blast furnace.
• This procedure has the advantage that the non-adherent or superfluous materials fall freely to the bottom and on the other hand that any excess water which descends under the effect of gravity is incorporated into the material brought later.
• the trickling water during the progress of the work, would destroy, by the loss of water due to gravitation, the good water-cement balance during the beginning of setting. Therefore, the last upper crowns would have a very poor quality of concrete and in particular a friability at the place even where very high abrasion resistance is sought.
• repair or repair treatment must be understood in the broad sense and includes operations other than spraying by the technique known as gunning of refractory materials, cold or hot.
• the lance can in particular be used to carry out a blasting in order to clean the walls of bricks or shielding or crown of dust and adherent materials of all kinds and to update the healthy body of the refractory coating before proceeding to a guniting.
• Figure 1 shows a partial schematic view of an upper half of a blast furnace with the chute and the equipment according to the invention in a first position.
• Figure 2 shows a view similar to that of Figure 1 with a lance in the partially deployed position.
• Figure 3 is a view similar to Figure 1 with another form of relaying of the equipment according to the invention.
• FIG. 4 is a perspective view of the chute equipped with the lance according to the invention.
• Figure 5 is a detail view in elevation of a gunning head in particular.
• This equipment is essentially constituted by a telescopic lance 21 formed of square section tubes and provided at one end with a projection head 23 of curved shape.
• a cable 25 is wound around a winch 27, preferably a pneumatic winch, to allow the cable 25 to run smoothly.
• the telescopic lance 21 is shown as consisting of four telescopic sections. It should be understood, however, that a different number of sections can be provided, the length of the sections and their number having to be chosen so that the lance can reach the different points subjected to the repair or repair operation.
• Adequate elements for example retaining chains, are of course provided so that the different sections or sections of the lance 23 cannot disengage. These elements can either be constituted by stops or by chains retaining the sections so that a length sufficient section. of the lance remains in the previous section.
• the head 23 of the lance is designed so as to be able to direct a jet, in particular a gunning jet in the manner shown in FIG. 2. It will be appreciated that by acting on the rotation and the inclination of the chute and by deploying adequately lance 21, it is possible to reach any desired point inside the blast furnace, the lower limit of the point which can be reached in the tank being of course determined by the possibility of deployment of the throws 21.
• the deployment of the lance is ensured under its own weight, by unwinding the cable 25 using the winch 27.
• the ascent of the lance is obtained by winding the cable 25 on the winch 27.
• at least two conduits are provided, on the one hand for the supply of dry refractory materials and on the other hand for the supply of water or other fluids.
• Other conduits can also be provided, in particular accessory conduits for the projection of a blasting material or for the circulation of a cooling fluid.
• the various flexible conduits identified by the reference 29 are taken up by return pulleys 31 and 33 in the upper part of the top and are brought to a conventional supply device (not shown).
• the process of the invention takes place (possibly after a shot peening operation intended to update the sound part of the coating, by causing a projection by gunning of an adequate refractory material) from top to bottom. bottom or, depending on the quality of the materials and the spraying method adopted, preferably from bottom to top by causing the telescopic rise of the lance previously deployed.
• the variant embodiment of FIG. 3 comprises a lance 21 suspended from the end of the chute 7 and held by jacks 51 preferably arranged on either side of the chute possibly after reinforcement of the latter and allowing thus to modify the angle of inclination of the lance relative to the chute.
• the quality of the steels chosen will be calculated according to the desired spans and the loads to be supported. If retaining chains are provided to prevent disengagement of the sections of the lance, they will also be calculated in an adequate manner while taking care to preserve a sufficient engagement for example of approximately 1 m of each section of lance in the upper element.
• Figure 4 there is shown how the lance 21 is mounted in the chute 7. This assembly is advantageously done by suspending the lance 21 to the stiffening spacers 41 and 43 which are generally permanently mounted at the ends of the chute. If necessary, it is possible to provide additional spacers such as those indicated at 45.
• the design of the projection head 23 is illustrated in FIG. 5.
• a rounded chamber 55 is arranged in its body which partially fills with the projected material, thereby protecting this body from wear and tear under the effect of the admitted material. It is found that heads of this type where material-to-material contact is ensured can resist without significant abrasion for considerably longer periods of time.
• This head can of course be fitted with a spout (not shown) of suitable shape and is particularly effective for working in positions similar to those illustrated in FIG. 2.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)
• Blast Furnaces (AREA)
• Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
• Feeding And Controlling Fuel (AREA)

Priority Applications (1)

Applications Claiming Priority (2)

Publications (2)

Family

ID=9306428

Family Applications (1)

Country Status (11)

Families Citing this family (1)

Family Cites Families (5)

• 1984
  • 1984-07-24 FR FR8411716A patent/FR2568361B1/fr not_active Expired
• 1985
  • 1985-07-08 AT AT85903194T patent/ATE44607T1/de not_active IP Right Cessation
  • 1985-07-08 BR BR8507216A patent/BR8507216A/pt not_active IP Right Cessation
  • 1985-07-08 KR KR1019860700167A patent/KR860700288A/ko not_active Application Discontinuation
  • 1985-07-08 WO PCT/BE1985/000013 patent/WO1986000978A1/fr active IP Right Grant
  • 1985-07-08 DE DE8585903194T patent/DE3571498D1/de not_active Expired
  • 1985-07-08 AU AU46356/85A patent/AU4635685A/en not_active Abandoned
  • 1985-07-08 EP EP85903194A patent/EP0226576B1/de not_active Expired
  • 1985-07-17 ES ES545296A patent/ES8701964A1/es not_active Expired
  • 1985-07-18 AR AR85301022A patent/AR242446A1/es active
• 1986
  • 1986-03-24 NO NO86861164A patent/NO167479C/no unknown

Non-Patent Citations (1)

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