TW200416290A - Reduced iron discharging apparatus - Google Patents

Abstract

The reduced iron discharging apparatus of this invention comprises: a water cooling rotary shaft (1) supported rotatably by a frame; and spiral vanes (2) formed by a plurality of separate vanes that are fixed spirally and continuously along the outer periphery of the water cooling shaft (1) by means of bolts and nuts. The spiral vanes (2) are integral in the thickness direction. The Vickers-hardness of the material of the spiral vanes (2) at the temperature of 900 DEG C is greater than or equal to 110 and less than 470. Preferably, the material of the spiral vanes (2) consists essentially of cobalt and chrome and, if necessary, further contains tungsten, or consists essentially of chrome and, if necessary, further contains at least one or two of carbon, nickel, cobalt, tungsten, manganese, and vanadium.

Description

. It should be stated: the technical field, prior art, content, implementation and drawings of the invention are briefly explained)

The invention belongs to the technical field J. TECHNICAL FIELD The present invention relates to a reduced iron discharge device for discharging the reduced iron in a moving bed type reduction furnace to the outside of the furnace, and relates to a reduction furnace equipped for example in a rotary furnace. A device near the reduced iron discharge port of the hearth furnace and rotating the spiral blades to discharge high-temperature reduced iron to the outside of the furnace. BACKGROUND OF THE INVENTION As disclosed in US Patent No. 4,636,127, there is known a reduced iron discharge device. In order to limit the temperature of a spiral blade, cooling water is supplied not only to a water-cooled rotating shaft, but also to a spiral blade for cooling. However, if the cooling water is also supplied to the spiral blades, the cooling water path to the cooling blades is complicated, so it is not only disadvantageous in terms of manufacturing costs, but also the problem that the cooling water is likely to leak. In addition, Japanese Patent Laid-Open Publication No. 10-339583 discloses that a worm for exhaustion includes a plurality of continuous solid single-layer spiral blades (spiral blades) fixed to the outer surface of the outer cylinder at an interval; and A continuous solid that faces the base end and extends at least part of the outer surface of the aforementioned outer cylinder: a double-layer spiral piece (spiral blade). However, if it is a double-layer spiral sheet (spiral sheet), the two blades are joined by dazzling, etc., and because they are used in a high-temperature furnace, the welding may be peeled off due to abrasion, causing the spiral blade to fall. In addition, it is disclosed in Japanese Patent Laid-Open Gazette No. 1 and Invention Description that the Yenhara iron discharge device includes a water-cooled rotating shaft; and a plurality of divided blades provided in a spiral manner along the outer periphery of the water-cooled rotating shaft by bolts and nuts / caps The spiral blades are rotated and the reduced iron in the reduction furnace is discharged by rotation, wherein the aforementioned bolts and nuts are covered with an unshaped refractory. When covered with the indefinite type 5 refractory, although it is an effective heat-resisting measure for bolts and nuts, silk reel does not help to extend the life of the blade body. Therefore, an object of the present invention is to provide a reduced-reduction iron discharge device that is simple and easy to wear even if it is used in a high-temperature furnace for a long period of time, and can achieve a long life. 10 [^^ 明 内 ^!] Disclosure of the invention The present invention provides a reduced iron discharge device, which can be realized by using spiral blades made of materials suitable for the use environment of the reduced iron discharge device and having high hardness at high temperatures. Those who use the conventional water-cooled spiral blades and still have a long life of 15 are as follows. The far-primary iron discharge device of the present invention is used to discharge the moving bed type, · the reduced iron in the furnace to the outside of the furnace, including a water-cooled rotating shaft, which is supported in a rotatable state; and The spiral snail blades are spirally formed along the water-cooled spinner ^ 20 Readers;-Also, the spiral blades are integrated in the direction of Xunzi degree in Tomiao Qi, and the material of the spiral blades is At 900 ° C, the Weiwei age drop <λ Vickers hardness is greater than or equal to 110 and less than 470. At this time, the material of the aforementioned spiral blade is mainly composed of cobalt and chromium, and it is also possible to further include tungsten. The material of the 8 ^ 14 spiral blade is mainly composed of chromium. It can also contain A or include one, two or more of them. z Another month, the spiral blade can also be formed by a majority of bolts and nuts in a spiral shape along the outer periphery of the water-cooled rotating shaft. This Maoming avoidance iron discharge device is used to discharge the reduced iron in the moving bed type reduction furnace to the outside of the furnace, including: ', chilled% shaft, which is supported to be rotatable; and The 10 spiral blades are continuously arranged along the outer periphery of the water-cooled rotation axis in a spiral shape; the helical blades are integrated in the thickness direction, and the material of the spiral blades is mainly composed of cobalt and chromium. At this time, the material of the spiral blade may further include tungsten. 15 Brief Description of Drawings Fig. 1 is a schematic view showing a side surface of the reduced iron discharge device of the embodiment. The second figure is a diagram showing a specific example of a water-cooled square centrifugal shaft and a spiral blade. [Embodiment] The best form for implementing the present invention The following examples are used to describe the present invention in detail, but the invention is of course not limited to this. And other embodiments. However, the features, properties, and advantages of the present invention should be made clearer by the attached drawings and detailed description of the following preferred embodiments. 7 200416290 发明. Description of the invention Fig. 1 is a schematic diagram showing the reduced iron discharge device of this embodiment. FIG. 2 is a diagram showing a specific example of a water-cooled rotating shaft and a spiral blade. On the left of FIG. 1, a rotary hearth of a reducing bed of a moving bed type not shown in the figure is arranged. This structure is that once the water-cooled rotating shaft 丨 rotates, the spiral blade 2 not disposed along its outer periphery 5 also rotates, and the reduced iron 3 is discharged to the outside of the furnace.

The reduced iron 3 series uses oval briquettes. Here, the so-called round compact is a compact similar to an almond or a pillow. A compact having a major diameter of about 24 mm × a minor diameter of about 16 mm × a thickness of about 12 mm and a volume of about 2 is used. A cooling water flow path is formed inside the water-cooled rotating shaft 1, and is supported by a frame not shown in Fig. 10 in a rotatable state. As shown in FIG. 2, the spiral blade 2 is a spirally continuous blade that can be divided into a large number. Each of the divided blades 2a is provided along the outer periphery of the water-cooled rotating shaft 1 by a bolt 4 and a nut 5 in a spiral shape. The spiral blade 2 is system-body in the thickness direction, and it is not necessary to provide a water path in the interior as in the conventional water-cooled blade to form a simple structure. Say

Going one step further, the material of spiral blade 2 is wicked at 900t

Hv (drill hardness value) is 11 or more and less than 47. Therefore, even if the spiral blades are not cooled, the temperature of the furnace during operation can significantly reduce the wear and tear of the spiral blades 2 and reduce the knowledge consumption of the red blades, and can significantly extend the life compared to the past. 20 Life. • Ingenious work force, including cranes as required (Materials 1 to 4). Like a table! As shown, materials 1 to 4 all contain the material having a Wicker hardness of greater than or equal to and less than ′, which is superior in abrasion resistance and can significantly achieve 1 8 5 玖, invention description. As shown in Table 1, 'By adding the main ingredients and adding cranes at the same time, the Vickers hardness of 90 (TC can be adjusted to a range greater than or equal to 11 () ^ less than ·. 15 (Table 1) Table 2 It is shown that the material of the spiral blade 2 is mainly composed of a network, and includes, as needed, two or more examples (material 5 to material 8), and SCH22 as a comparative example. Conventionally used for spiral The SCH22 of the heat-resistant steel of the blade has a constant Kickers hardness of 79 at 900t. In contrast, materials 5 to 8 in this example are included in the middle Wicker hardness.

In the range of 110 or more and 470 or less, the abrasion resistance is excellent, and a long life can be remarkably realized. As shown in Table 2 for materials 5 ~ 7, by adding the same 4 'and also adding cobalt, yan, fierce, and hungry appropriately, the Vickers hardness in the 90th generation can be adjusted to be greater than or special UG and less than 47g range. v Material 8 as shown in Table 2, increase the amount of carbon without adding nickel, and appropriately add m 'to thereby adjust the Vickers hardness of 9G (rc to 110 or more and less than 47 0). Range (Table 2)

As described above, since the spiral blade 2 is integrated in the thickness direction, 3 does not require the complicated structure for supplying cooling water to 20 pieces of water as in the conventional water-cooled spiral blade, and since the two-layer structure and the Spiral blades that have been upset and thickly welded can be a simple structure, and will not peel off due to wear, such as dazzling.早 900 C has an early Kickers hardness of greater than or equal to that, because if Vickers hardness cut 110 'is used to discharge reduced iron at high temperature, the spiral 9 200416290 is rose, and the invention explains that the blade 2 will not achieve long life due to wear. On the other hand, making the Wicker hardness of less than 470 ′ in 900 π is because if the Wicker hardness is greater than or equal to 470, the job is fragile and easy to be damaged. The same price must be increased for the more expensive cobalt and tungsten. The content rate leads to a high material cost and is extremely uneconomical. Therefore, the appropriate range of Wicker hardness in 900 C is greater than or equal to ⑽ and less than 470. ίο When the inventors performed the durability test in the real machine of the rotary hearth furnace, when using the reading, 'the life of the blade is about 3 months due to high temperature abrasion: For this, when using materials 4 and 6 (in degrees as (122 ~ 46〇), the blade life is about 9 months, which can be extended about 3 times. 15 Also, in the same machine, when the amount of carbon H is increased * when using a material with a Vickers hardness of 5⑽ in 90 ° C, although it has less wear, it will be damaged, and the life of the blade is about 3, which is roughly the same as that of SCH22. Same. From the foregoing results, it can be known that the range of Wicker hardness in the 900t range is greater than or equal to 110 and less than 470a, which can prevent the wear of the spiral blade 2 field and become difficult to be damaged. Long life. Industrial availability 20, as mentioned above, it can be seen that according to the present invention, a simple device can be provided: even if it is used in a high-temperature furnace for a long time, it is not easy to wear and can be discharged from the original iron. The device 'specifically is the temperature of the working order == under the temperature' can realize even if the conventional water-cooled spiral blade dish is not used, the second long ... reduced iron discharge device can be extremely useful in the industry 10 200416290 玖Description of the invention Table 1 Composition% Hardness (Hv) Co Cr WC Fe Si Ni Normal temperature 700 ° C 800 ° C 900 ° C Material 1 Bal 30 12 2.5 &lt; 3 &lt; 2 &lt; 3 630 470 400 360 Material 2 Bal 28 4 1 &lt; 3 &lt; 2 &lt; 3 460 340 290 250 material 3 B al 27 a 0.3 &lt; 2 &lt; 1 &lt; 2.5 380 250 225 190 material 4 Bal 32 17 2.5 &lt; 3 &lt; 2 a 680 530 500 460

Table 2 Composition% Hardness (Hv) C Cr Ni Other normal temperature 700 ° C 800 ° C 900 ° C SCH22 (comparative) 0.4 25 2 283 153 114 79 Material 5 0.3 26 16 Co, W Other 280 173 162 Material 6 0.1 27 13 Co, W other 248 139 122 material 7 0.3 18 6 Mn, V other 290 140 125 material 8 2.5 17 one Mn, V other 750 280 200 150

Brief description of the L diagram 3 5 FIG. 1 is a schematic diagram showing a side surface of the reduced iron discharge device of the embodiment. Figure 2 shows a specific example of a water-cooled rotating shaft and a spiral blade. Figure 10 10 200416290 发明 Description of the invention [List of representative symbols of the main elements of the drawing] 1 ... Water-cooled rotating vehicle 2. .. Spiral blade 2a ... each Divided Blades 3 .. Frontal Iron 4 .. Bolts 5. Nuts

Claims (1)

Scope of application and patent application l-A kind of reduced iron discharged to the farm, which is used to discharge the reduced iron in the moving bed type reduction furnace to the outside of the furnace. 'Including: Water-cooled rotating shaft' is supported and can be rotated. ; And 5 spiral blades, which are continuously arranged along the outer periphery of the water-cooled rotation axis in a spiral shape; and 'the spiral blades are integrated in the thickness direction, and the material of the spiral blades has a Vickers hardness of 900 &lt; t greater than Or equal to 110 and less than 470 〇10 Among the first two, as in the reduced iron discharge device of the scope of the patent application, the spiral blades of the sacrificial blades and chromium are the main components. Among them, the material of the top 3 · returning spiral of the reduced iron discharge device in the scope of the patent application includes cranes. 15 Among them, the material of the suspected blades of the reduced iron discharge device in the scope of the 1st scope of the patent application in May Chromium is the main component. Among them, the material of the spiral blades of the reduced iron discharge device in the fourth item of the patent scope of Shenyang and Shenyue contains carbon. 6. The reduced iron discharge device in the fourth item of the patent application scope, of which the top 20 The material of the spiral blades includes one or more of nickel, cobalt, crane, fierce or cricket. • If you please patent the reduced iron discharge device of item 1 of the Weitu Chudi, where the front fan spiral pen # 技 » Do ^ ', Xi Shu borrowed bolts and nuts in a spiral shape along the water-cooled rotation axis outside the month% strike ^ ^ 5 week 5 and formed by dividing the blade.-A kind of reduced iron row 屮 strong clothes, the system Those used to discharge the moving bed type reduction furnace 13 8 and the reduced iron within the scope of the patent application to the outside of the furnace include · 4 / the rotating shaft 'system is supported to be rotatable; and spiral blades' Is spirally along this The outer periphery of the water-cooled rotating shaft is continuously installed; the whelical spiral blade is integrated in the thickness direction, and the material of the spiral blade 2 is mainly composed of surface and chromium. The reduced iron discharge device of claim 8 of the patent scope, The material of the aforementioned spiral blade further includes tungsten. 14