Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
  • F16L55/162—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe
  • F16L55/165—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section
  • F16L55/1657—Devices for covering leaks in pipes or hoses, e.g. hose-menders from inside the pipe a pipe or flexible liner being inserted in the damaged section lengths of rigid pipe being inserted
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21B—MANUFACTURE OF IRON OR STEEL
  • C21B7/00—Blast furnaces
  • C21B7/10—Cooling; Devices therefor
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
  • F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
  • F16L55/175—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by using materials which fill a space around the pipe before hardening
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
  • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
  • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
  • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
  • F16L55/179—Devices for covering leaks in pipes or hoses, e.g. hose-menders specially adapted for bends, branch units, branching pipes or the like
• • 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
  • F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements
• • 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
  • F27D9/00—Cooling of furnaces or of charges therein

Definitions

• the cooling stave of the blast furnace body is used to protect the furnace shell, provide cooling, support brick lining refractory material and maintain a proper furnace shape.
• the heat of refractory material is transferred to the cooling stave base, and the base transfers heat to a pipe carrying cooling water.
• the cooling water takes heat out of the furnace.
• One failure mode occurs when the pipeline fractures in the heat load.
• a first aspect of the application describes a repair method for a cooling stave utilized in a blast furnace, the cooling stave having a stave inlet outlet pipe attached to the cooling pipe in the cooling stave, the method comprising of the steps of: inserting a rigid pipe into the compromised stave inlet outlet pipe to form a first annulus; inflating a bladder disposed inside the inner pipe and cooling stave; injecting a first uncured epoxy material into the first annulus; permitting the first uncured epoxy to cure; and removing the bladder.
• a first end of the inner tube distal to the stave further comprises a means for introduction of the first uncured epoxy to the first annulus
• a second end of the inner tube proximal to the stave further comprises means for venting air displaced during injecting of a first uncured epoxy into the first annulus.
• the repair method further comprises the steps of: applying an outer pipe external to the compromised stave inlet outlet pipe to form a second annulus; injecting a second uncured epoxy material into the second annulus; and permitting the second uncured epoxy material to cure.
• the first and second uncured epoxies are cured concurrently.
• the first uncured epoxy is cured before the second uncured epoxy is cured.
• a first end of the outer tube distal to the stave further comprises a means for introduction of the second uncured epoxy to the second annulus
• a second end of the outer tube proximal to the stave further comprises a boot adapted to form seals with the outer tube and the stave, and the second end having an aperture in open communication with the second annulus
• a second aspect of the application describes a repair method for a cooling stave utilized in a blast furnace, the method comprised of the steps of: rethreading an aperture in the cooling stave formed after removal of a compromised stave inlet outlet pipe; installing a new inlet outlet pipe; inserting an inner rigid pipe into the new stave inlet outlet pipe to form an annulus; inflating a bladder inside the inner rigid pipe and the cooling stave; injecting an uncured epoxy material into the annulus; permitting the uncured epoxy to cure; and removing the bladder.
• a third aspect of the application describes a repair system kit for a cooling stave utilized in a blast furnace, the cooling stave having a stave inlet outlet pipe comprised of: an inflatable bladder; an inner rigid pipe; a grout inlet; and a vent tube.
• the repair system further comprises a concentric outer pipe; and a flexible rubber seal.
• FIGURE 1 illustrates embodiments of elements of one aspect of the application.
• FIGURE 2 illustrates further embodiments of elements of the application.
• FIGURE 3 illustrates another aspect of the application.
• FIGURE 4 illustrates existing stave failure mechanisms.
• FIGURE 5 illustrates existing stave failure mechanisms.
• FIGURE 6 illustrates existing stave failure mechanisms.
• the repair system utilizes an inflatable bladder 20, a concentric inner rigid pipe 1, a custom machined grout inlet 7, vent tube 8, and compression fitting 3.
• inner rigid pipe 1 is inserted into the compromised stave pipe 27.
• Inflatable bladder 20 is inserted into the inner rigid pipe 1 as far as stave 30.
• the bladder 20 is inflated to a specified pressure and epoxy 15 is injected into the compromised stave inlet outlet pipe 27 and around the inner rigid pipe 1 via the grout inlet 7 in fitting 2.
• the epoxy 15 is injected until the entire first annular gap 28 between the compromised stave inlet outlet pipe 27 and the inner rigid pipe 1 is filled.
• An optional vent tube 10 is positioned in the first annular gap 28 extending beyond the length of the first annular gap 28 allows for displaced air to escape. After the epoxy 15 is injected it is cured. When the curing is finished the bladder 20 is deflated and removed.
• the inner rigid pipe 1 is an epoxy pipe.
• an outer rigid pipe 5 may be positioned around the compromised stave pipe 27.
• a grout inlet 7 is formed or attached through the outer rigid pipe 5.
• a flexible seal 6 is fitted to an end of the outer rigid pipe 5.
• the flexible seal 6 has an optional aperture 31 to allow for escape of displaced air.
• Epoxy 15 is injected until the entire second annular gap 29 between the compromised stave inlet outlet pipe 27 and the outer rigid pipe 5 is filled. After the epoxy 15 is injected it is cured.
• the outer rigid pipe 5 is an epoxy pipe.
• the compromised stave inlet outlet pipe 27 may first be removed from the stave 30 to give a resulting aperture.
• the resulting aperture is rethreaded and a new inlet outlet pipe is installed in the resulting aperture.
• the method steps of the first and second embodiments may then follow.
• stave inlet hoses may be reattached to the epoxy pipe 1, in a preferred embodiment through an attached connector 4 and elbow 11 and the water circuit tested per plant procedures.
• a dowel rod 23 and pull rod 25 are used to assist in the insertion and removal of the bladder 20.
• a repair system kit for a cooling stave utilized in a blast furnace having a compromised stave inlet outlet pipe comprised of an inflatable bladder 20, a rigid inner pipe 1; a grout inlet 7; and a vent tube 8.
• the repair system kit may further comprise rigid outer pipe 5 and flexible seal 6.
• FIGURES 4-6 illustrate example staves 30 and stave inlet/outlet pipes 27 that may be repaired with the repair system and repair kit of the present application.
• FIGURE 4 illustrates a weld or pipe fracture 50 caused by heating and cooling cycles
• FIGURE 5 illustrates a pipe or weld fracture 50 caused by flow disruptions
• FIGURE 6 illustrates a pipe or weld fracture 50 caused by plug washing.
• This method of repair allows the customer to reestablish water to a compromised water pipe without losing the cooling effects of the water in contact with the stave.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Materials Engineering (AREA)
• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Blast Furnaces (AREA)
• Pipe Accessories (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)

Priority Applications (9)

Applications Claiming Priority (2)

Publications (1)

Family

ID=47505309

Family Applications (1)

Country Status (12)

Cited By (1)

Families Citing this family (11)

Citations (6)

Family Cites Families (14)

• 2012
  • 2012-12-06 IN IN4504CHN2014 patent/IN2014CN04504A/en unknown
  • 2012-12-06 US US13/707,213 patent/US20130340874A1/en not_active Abandoned
  • 2012-12-06 MX MX2014006887A patent/MX2014006887A/es unknown
  • 2012-12-06 CA CA2858567A patent/CA2858567A1/en not_active Abandoned
  • 2012-12-06 RU RU2014127181A patent/RU2014127181A/ru not_active Application Discontinuation
  • 2012-12-06 KR KR1020147017324A patent/KR20140097448A/ko not_active Withdrawn
  • 2012-12-06 WO PCT/US2012/068246 patent/WO2013086192A1/en not_active Ceased
  • 2012-12-06 BR BR112014033170A patent/BR112014033170A2/pt not_active IP Right Cessation
  • 2012-12-06 AU AU2012347750A patent/AU2012347750A1/en not_active Abandoned
  • 2012-12-06 CN CN201280062376.4A patent/CN103998847A/zh active Pending
  • 2012-12-06 EP EP12810461.9A patent/EP2788649A1/en not_active Withdrawn
  • 2012-12-07 AR ARP120104592A patent/AR089188A1/es unknown

Patent Citations (6)

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