JP2013032558A - Tuyere stock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tuyere stock by means of which a reduction of the general operating costs of a shaft furnace is possible, apart from a far-reaching reduction of the energy consumption associated with production of iron.SOLUTION: The tuyere stock includes at least one thermal insulation element 7 arranged at least in a partial area between a metallic exterior structure 5 and a refractory interior lining 6 of an articulated compensator 15, nozzle elbow 3 and/or nozzle tip 1. The thermal insulation element is constituted of a highly temperature-resistant thermal insulation material embedded into a sheathing, wherein the sheathing by and large dissolves itself during the intended use of the tuyere stock.

Description

  The present invention relates to a tuyere stock for introducing hot air into a blast furnace, particularly a blast furnace, wherein the tuyere stock consists of at least one articulating compensator, one nozzle elbow, and one nozzle tip, It consists of a metal outer structure provided with a refractory inner lining on the inside facing the hot air, and the articulating compensator is connected at one end to a nozzle elbow and at the other end to a hot air annular main tube.

  Furthermore, a method for producing tuyere stock formed by at least an articulating compensator, a nozzle elbow, and a nozzle tip is proposed by the present invention, whereby hot air can be introduced into a blast furnace, in particular a blast furnace. After the metal outer structure is initially provided, the articulating compensator, nozzle elbow, and nozzle tip are subsequently coated with a refractory material to provide a refractory inner lining.

  In order to reduce energy consumption in iron making by the blast furnace, high-temperature air called hot air in the metallurgical industry is blown into the blast furnace at a temperature of about 1200 ° C to 1350 ° C. For this purpose, the ambient air is usually heated by a hot air air heater to the desired substantially constant temperature in the range. The hot air generated in this way is supplied to the blast furnace through the hot air main pipe system. During this process, hot air first flows from the hot air heater to the hot air annular main tube of the hot air main system extending around it in the lower section of the blast furnace. From this hot air annular main pipe, the hot air is continuously distributed to a plurality of tuyere stocks that are spatially distributed on the outer periphery of the blast furnace, and the tuyere stocks are also designed as hot air tuyere stocks. As a closing element for the hot air main system, the tuyere stock consists of a single nozzle tip, each of which is typically coupled to the tuyere stock in the region between the coal bag and the blast furnace raceway. And has partially entered the blast furnace.

  In order to reduce energy loss and extend the life of the hot air main pipe system due to the high temperature of the hot air, it is necessary to provide an adiabatic refractory inner lining for the components of the system inside the hot air. In particular, this applies to tuyere stock consisting of a plurality of components, each connected to one another. Before assembling these components to obtain a single tuyere stock, it is necessary to provide these components individually with a refractory inner lining. According to the prior art, the refractory inner lining is in most cases arranged just inside the metal outer structure of such components facing hot air.

  The metal outer structure is usually made of steel and is configured differently for the various components of the tuyere stock. For example, the metal outer structure of the nozzle tip is substantially conical. Conversely, for example, the articulating compensator consists of a tubular metal outer structure. Furthermore, the tuyere stock consists of a nozzle elbow and its metal outer structure has a significantly more complex configuration than that applied to the nozzle tip and the articulating compensator. Within the scope of the present invention, these differently shaped load-bearing metal parts of tuyere stock are described and illustrated as the more general term “metal outer structure”.

  The effect of the refractory inner lining of the hot air annular main system and tuyere stock is that the temperature of the outer surface of the metal outer structure is reduced to about 300 ° C to 350 ° C. Thereby, energy loss can be reduced. Furthermore, the safety in the work area outside the blast furnace is increased.

  The articulated compensator serves to compensate for the deformation of the hot air main pipe system caused by the heat load. Articulated compensators are typically equipped with cardan joints and corrugated bellows that are located in the transition area of the tuyere stock to other components. In order to protect sensitive compensator elements from high heat loads, the refractory inner linings of the immediately adjacent components need to be installed as close as possible to each other.

  As tuyere stock is exposed to high heat loads as described above, it must be renewed from time to time, which means that tuyere stock must be provided with a new refractory inner lining. . Removal of the worn refractory inner lining is most often done using a drill hammer and similar tools and is therefore expensive. Furthermore, damage to the inside of articulated compensator sensitive elements such as corrugated bellows and metal outer structures facing hot air occurs fairly frequently.

  Based on this background, the object of the present invention is to provide tuyere stock, which reduces the overall operating costs of the blast furnace in addition to the significant reduction in energy consumption associated with steelmaking. It can also be reduced.

  The problem is that the tuyere stock consists of a heat insulating element arranged in at least a partial area between the metal outer structure of the articulating compensator, nozzle elbow and / or nozzle tip and the refractory inner lining, By a tuyere stock of the nature described at the beginning, which consists of a heat-resistant heat-insulating material embedded in the sheath, and the sheath itself generally dissolves during the intended use of the tuyere stock Solved.

  The effect of the arrangement according to the invention of the additional thermal insulation element between the metal outer structure and the refractory inner lining of at least one component of the tuyere stock is that the energy loss through the tuyere stock is further reduced. It is. The temperature outside the surface of the metal outer structure of the tuyere stock or the tuyere stock component is compared according to the invention with a conventional tuyere stock, i.e. a tuyere stock without additional thermal insulation elements Thus, the temperature can be reduced by about 100 ° C to 150 ° C. This represents a significant energy savings that can be expressed in coke per ton of pig iron produced. Furthermore, the life of the tuyere stock is substantially extended due to the metal outer structure of the articulating compensator and the lower thermal load of the elements.

  With the tuyere stock of the present invention, additional thermal insulation elements weaken the bond between the metal outer structure and the refractory inner lining. This is because during the intended use of the tuyere stock, the coating itself dissolves sufficiently, in particular it ashes itself. As a result, the refractory inner lining can be removed in the renewal of tuyere stock from the metal outer structure at substantially lower expense compared to conventional tuyere stock. This results in further cost reduction.

  In general, the use of the tuyere stock of the present invention represents a substantially more cost effective option in terms of operating costs and energy efficiency compared to the use of conventional tuyere stock.

  Within the scope of the invention, it is conceivable to use a plurality of particularly differently configured insulation elements for the tuyere stock, which are arranged in a particularly sensitive location of the tuyere stock, for example in the region of the articulating compensator.

  According to an advantageous embodiment of the invention, the covering is constructed as a flake made essentially of plastic. During the intended use of the tuyere stock, the flakes are ashed, which generally dissolves itself. The plastic material can be, for example, polyethylene or polyamide, or a mixture thereof. Metal coated plastic materials are also suitable.

  According to another advantageous embodiment of the invention, the thermal insulation material consists of at least one inorganic, siliceous material. Preferably, the inorganic siliceous material is highly dispersible (pyrogenic material) silicic acid. An inorganic siliceous material of this nature has a very low thermal conductivity and thus serves to provide a thermal insulation element with excellent thermal insulation properties.

  In another advantageous embodiment of the invention, the insulating material consists of at least one means for reducing heat radiation transport in the insulating material. This nature and type of means, also called opacifier, serves to reduce the permeability of the thermal insulation material to infrared radiation, and the opacifier can disperse and / or absorb infrared radiation. This configuration is meaningful in the tuyere stock of the present invention. This is because the heat insulating property of the heat insulating material decreases with increasing temperature unless an opacifier is added.

  The heat insulating material is preferably configured in the form of a powder and is pressed into a molded body. In this format, molded bodies having a variety of different geometric shapes can be provided so that the thermal insulation material can be ideally adapted to the relevant location of use. The shaped body is preferably configured in the form of a rod. A plurality of molded bodies may be embedded in a common covering. In particular, a plurality of rod-shaped molded bodies can be positioned in the covering body in parallel with each other at short intervals. If a covering made of a plastic material is selected, the flexible insulation element can be configured so that the shape of the insulation material can be easily adapted to the relevant place of use by deformation.

  Furthermore, it is proposed that the thermal insulation material is evacuated and shrink-wrapped in the sheath. By evacuation, the thermal insulation properties of the thermal insulation material and the thermal insulation properties of the thermal insulation element are further improved by reducing the portion of heat transfer in the thermal insulation material that is generated by convection during the use of the thermal insulation element. The effect of shrink wrapping of the pressed insulation material into the cladding is further that the insulation material reliably maintains its shape and physical properties during the production of tuyere stock.

  It is further proposed that the thermal insulation element is bonded to the metal outer structure by adhesion. This allows such insulating elements to be joined in a simple manner to the associated metal outer structure before providing a refractory inner lining. In particular, this makes it possible to position the flexibly configured insulation element in a simple and permanent manner at the relevant desired use location. When installing a refractory inner lining, the thermal insulation element is secured by the refractory inner lining, for example by surrounding the metal outer structure with a known type of refractory concrete. The provided adhesive can thereby dissolve itself by ashing during operation of the tuyere stock.

  In order to solve the above problems, a method of the nature and type mentioned at the beginning is proposed, according to which at least inside the metal outer structure of the articulating compensator, nozzle elbow and / or nozzle tip facing the hot air. According to the invention, a thermal insulation element is arranged in at least one partial area on the inside before being surrounded by a refractory material, said element being previously pressed into a shaped body Insulation material is formed by enclosing within a sheath that generally dissolves itself during the intended use of the tuyere stock.

  The method according to the invention is also associated with the advantages of blast furnace energy savings and reduced operating costs outlined above in relation to tuyere stock. It is advantageous to use a flake as a covering, which is mainly formed from a plastic material. Preferably, the thermal insulation element is bonded to the metal outer structure.

  Other advantages and features of the invention are shown in more detail below by means of a practical example shown on the basis of the attached drawings.

1 is a perspective view illustrating an exemplary embodiment of a nozzle tip of a tuyere stock according to the present invention. FIG. It is a longitudinal cross-sectional view which shows the nozzle front-end | tip part shown by FIG. 1a. It is a longitudinal cross-sectional view which shows the nozzle front-end | tip part shown by FIG. 1a and FIG. 1b along the BB line in FIG. 1b. 1 is a perspective view of an exemplary embodiment of a tuyere stock nozzle elbow according to the present invention. FIG. It is a longitudinal cross-sectional view which shows the nozzle elbow shown by FIG. 2a. 1 is an exploded perspective view showing an exemplary embodiment of a tuyere stock articulating compensator according to the present invention. FIG.

  FIG. 1 shows in perspective view an exemplary embodiment of a nozzle tip 1 of a tuyere stock according to the invention, not shown. With the intended use of the nozzle tip 1, the hot air flows through the nozzle tip 1 and flows out from the outlet opening 2. At the other end, the nozzle tip 1 can be coupled to the nozzle elbow 3 of the tuyere stock, an exemplary embodiment of the nozzle elbow 3 is shown in FIGS. 2a and 2b. A feeder 4 is disposed outside the nozzle tip 1 along the outer periphery, and a substance that optimizes the combustion process in the blast furnace can be supplied to the flow of hot air through these feeders 4.

  FIG. 1b shows a longitudinal sectional view of the nozzle tip 1 shown in FIG. 1a. Shown is a load-bearing metal outer structure 5 provided with a refractory inner lining 6 inside facing the hot air. According to the invention, a heat insulating element 7 is arranged between the metal outer structure 5 and the refractory inner lining 6. This thermal insulation element 7 is made of a high heat-resistant thermal insulation material not shown here and is embedded in the covering, which itself is itself in use during the intended use of the tuyere stock. Generally dissolves, especially ash. The feeders 4 each consist of a feeder channel 8, which penetrates the refractory inner lining 6 and terminates in a passage duct 9 at the nozzle tip 1.

  FIG. 1c shows the nozzle tip 1 of FIGS. 1a and 1b in a longitudinal section along the line BB in FIG. 1b. In particular, the end of the feeder channel 8 in the passage duct 9 is shown. Furthermore, the configuration according to the invention of the nozzle tip 1 can be recognized here, and a heat insulating element 7 is arranged between the metal outer structure 5 and the refractory inner lining 6 downstream of the nozzle tip 1. Yes.

  FIG. 2a shows a practical example of a tuyere stock nozzle elbow 3 according to the invention in a perspective view. The nozzle elbow 3 can be coupled to an articulating compensator 15 via a flange 10, for example as shown in FIG. The nozzle elbow 3 can be coupled to the nozzle tip 1 via the flange 11 at the other end. The nozzle elbow 3 is composed of a branch path 12, and the branch path 12 is sealed by a flap 13 that can rotate around a hinge 14.

  FIG. 2b shows a longitudinal sectional view of the nozzle elbow 3 shown in FIG. 2a. It can be seen that the nozzle elbow 3 also has the configuration according to the present invention, and the thermal insulation element 7 is arranged between the metal outer structure 5 and the refractory inner lining 6 downstream of the nozzle elbow 3.

  FIG. 3 shows an exploded view of a practical example for a tuyere stock articulating compensator 15. The articulating compensator 15 can be coupled to the nozzle elbow 3 via a flange 16. The flange 17 allows the articulating compensator 15 to be coupled to a hot air annular main pipe (not shown) of the hot air main pipe system. In region 18, the articulating compensator consists of a corrugated bellows not shown in further detail here. Furthermore, the central member 19 consisting of the metal outer structure 5 coated with a refractory material can be joined by forming a cardan joint to the joining member 21 via the element 20. The element 20 also consists of a metal outer structure 5 and a refractory inner lining 6 provided for this metal outer structure 5.

  The articulating compensator 15 further comprises a plurality of differently configured heat insulating elements 7. According to the present invention, the heat insulating element 7 is formed of a refractory heat insulating material embedded in the covering. The covering is provided by a plastic flake consisting of a plurality of rod-shaped shaped bodies. The compacts configured in a rod shape are aligned parallel to each other and parallel to the longitudinal direction of the connecting compensator 15. The shaped body consists of a powdered mixture of highly disperse silicic acid and opacifier pressed into the shaped body. With this configuration, the thermal insulation element 7 is flexible and can be adapted without applying significant forces to the associated shape of the other components of the articulating compensator 15 at the relevant destination location. During the intended use of the tuyere stock and thus the articulated compensator, the plastic flakes ash due to the high temperature, which generally dissolves itself.

  DESCRIPTION OF SYMBOLS 1 Nozzle tip, 2 Outlet opening, 3 Outlet elbow, 4 Feeder, 5 Metal outer structure, 6 Fireproof inner lining, 7 Thermal insulation element, 8 Feeder channel, 9 Passage duct, 10 Flange, 11 Flange, 12 Branch pipe, 13 Flaps, 14 pivots, 15 compensators, 16 flanges, 17 flanges, 18 regions, 19 central members, 20 elements, 21 coupling members

Claims (13)

A tuyere stock for introducing hot air into a blast furnace, in particular a blast furnace, which comprises at least one articulating compensator (15), one nozzle elbow (3) and one nozzle tip (1 ), And the articulated compensator, the nozzle elbow, and the nozzle tip are each composed of a metal outer structure (5) provided with a refractory inner lining (6) on the inner side facing the hot air. ) Is connected to the nozzle elbow (3) at one end and can be connected to the hot-air annular main pipe at the other end,
At least one disposed in at least a partial region between the metal outer structure (5) and the refractory inner lining (6) of the articulating compensator (15), nozzle elbow (3) and / or nozzle tip (1) An insulation element (7) is provided, which consists of a high heat-resistant insulation material embedded in the covering, and the covering itself generally melts during the intended use of the tuyere stock A tuyere stock for introducing hot air into a blast furnace, especially a blast furnace.   The tuyere stock of claim 1, wherein the covering is configured as a flake formed essentially of a plastic material.   The tuyere stock according to claim 1 or 2, wherein the heat insulating material comprises at least an inorganic porous material.   The tuyere stock of claim 3, wherein the inorganic soil material is highly dispersible silicic acid.   A tuyere stock according to any one of the preceding claims, wherein the insulating material comprises at least one means for reducing heat radiation transport within the insulating material.   The tuyere stock according to any one of claims 1 to 5, wherein the heat insulating material is configured to be in a powdery form and is pressed to form a molded body.   The tuyere stock according to claim 6, wherein the molded body has a rod-like configuration.   The tuyere stock according to any one of claims 1 to 7, wherein the thermal insulation material is evacuated and shrink-wrapped in a covering.   A tuyere stock according to any one of the preceding claims, wherein the thermal insulation element (7) is bonded to a metal outer structure (5). A method for producing a tuyere stock comprising at least one articulating compensator (15), one nozzle elbow (3) and one nozzle tip (1), wherein hot air is blasted by said tuyere stock, in particular In a method of first providing a metal outer structure (5) for an articulating compensator (15), nozzle elbow (3) and nozzle tip (1) that can be introduced into a blast furnace and coated with a refractory material,
Inside the metal outer structure (5) of the articulating compensator (15), nozzle elbow (3) and / or nozzle tip (1) facing hot air, at least before coating the metal outer structure with a refractory material According to the invention, a thermal insulation element (7) is arranged in the at least one partial region on the inside, said thermal insulation element comprising a powdered thermal insulation material pressed into a shaped body at the tuyere stock. A method for producing tuyere stock, characterized in that it is preformed by shrink wrapping in a coating that itself generally dissolves during use.   11. A method according to claim 10, wherein the flakes made mainly of plastic material are used as the covering.   The method according to claim 10 or 11, wherein the insulating material (7) is bonded to the metal outer structure (5).   The tuyere stock according to any one of claims 1 to 9, characterized in that it is manufactured by the method according to any one of claims 10 to 12.

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