JP2002155309A - Ejecting device in movable furnace hearth type heat treatment furnace and its operation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ejecting device in a movable furnace hearth type reduction furnace with which a material to be heat-treated can continuously be ejected in a fixed amount without obstructing the operation in the movable furnace hearth type reduction furnace and a facility on the downstream side therefrom and without reoxidizing the material to be heat-treated in the reduction furnace. SOLUTION: The material to be heat-treated ejected from an ejecting hole 11 of the movable furnace hearth type reduction furnace 1, is ejected into a screen sizer 3, and the material to be heat-treated from which a large lump foreign material is removed with this screen sizer 3 is discharged into a receiving recessed position 71a in a receiving pan 71 arranged in a casing 5 with a hopper through a seal leg 4 into which reoxidization preventing gas is blown from a gas blowing nozzle 6, the material to be heat-treated piled on the upper surface of this receiving recessed position 71a, is ejected into the casing 5 with the hopper from both end parts in the longitudinal direction of the receiving pan 71 by swinging a scraper 72 and also, supplied into the facility at the downstream side from a lower ejecting hole 52 in the casing 5 with the hopper.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge apparatus for a moving hearth type heat treatment furnace and a method for operating the same. In more detail, the moving hearth-type heat treatment furnace, and reduced iron that does not hinder the operation of the downstream equipment and has a high risk of reoxidation,
A moving hearth type heat treatment furnace capable of quantitatively and continuously discharging reduced iron without reoxidizing reduced iron even when discharging, and reducing wear of components. And a method of operating the same.

[0002]

2. Description of the Related Art As is well known, in recent years, a moving hearth type in which reduced iron or metallic iron is produced by reducing raw materials containing iron ore, dust from ironworks, other waste, coal, etc. as components. Heat treatment furnaces are becoming widely used. In a moving hearth type heat treatment furnace for producing reduced iron or metallic iron, the raw material is reduced on the moving hearth, or after the reduction, the iron and slag are melted and separated by further heating.
A discharge device for discharging a mixture of reduced iron having high reoxidation property or metallic iron having no reoxidation problem (hereinafter referred to as a heat treatment target), a carbonaceous powder, and a slag mixture discharged from the discharge port. However, various types of discharge devices of such a moving hearth type heat treatment furnace are known.

First, a discharge device of a moving hearth type heat treatment furnace according to Conventional Example 1 includes a chute disposed between a discharge port of a heat treatment target of the moving hearth type heat treatment furnace and downstream equipment; The chute is provided with a two-stage or high-temperature on-off valve having a well-known configuration having more stages than that for preventing the outflow of high-temperature gas from the moving hearth type. That is,
By opening and closing the high-temperature on-off valves, the heat-treated material is discharged outside the furnace while the flow of the high-temperature gas from the moving hearth-type heat treatment furnace is prevented, and the discharged heat-treated material is supplied to downstream equipment. It is a configuration.

The object discharge device of the moving hearth type heat treatment furnace according to the prior art 2 is a chute disposed between the discharge port for discharging the heat treatment target of the moving hearth type heat treatment furnace and the detachable closed container. And a high-temperature on-off valve having a well-known configuration disposed in the middle of the chute.

[0005] The discharge device of the moving hearth type heat treatment furnace according to the prior art 3 comprises a vibrating feeder connected to the other end of a chute having one end connected to a discharge port for discharging a heat treatment target of the moving hearth type heat treatment furnace. , A screw conveyor, a pan conveyor or the like.

[0006]

In the discharge apparatus of the moving hearth type heat treatment furnace according to the above prior art example 1, the object to be heat treated discharged from the discharge port of the moving hearth type heat treatment furnace has a high temperature as high as 1000 ° C. at the maximum. In addition, since powder (carbonaceous powder) is also discharged, troubles such as blockage and sticking of the high-temperature on-off valve are likely to occur, and it is difficult to continue stable operation. In addition, the discharge of the material to be heat-treated by the high-temperature on-off valve is intermittent, especially when a melting furnace is installed on the downstream side, continuous melting cannot be performed, and improvement in productivity of reduced iron or metallic iron cannot be expected. There was a problem to be solved.

[0007] In the discharge apparatus of the moving hearth type heat treatment furnace according to the second conventional example, the high temperature on-off valve has the same problems as those of the first prior art example. It is difficult to make the chute disposed between the closed vessel and the closed vessel completely closed.Especially, when the moving hearth type heat treatment furnace is operated at a negative pressure, air flows into the moving hearth type heat treatment furnace. The risk of inflow is great. In other words, when air flows into the moving hearth type heat treatment furnace, the reduced reduced iron is re-oxidized and the product value is reduced, and the reduced iron is melted and fused by the heat of the oxidation, Problems such as burning of the powder occur, making it difficult to discharge, and further reducing the product value.

[0008] The discharge device of the moving hearth type heat treatment furnace according to the prior art 3 has the advantage that the heat treatment target can be discharged quantitatively, but the vibration feeder, the screw conveyer, the pan conveyer, etc. There are problems related to high temperature resistance and airtightness.
The reduced iron is re-oxidized and the product value is reduced, and the reduced iron is melted by the heat of the oxidation and the reduced iron is fused together.
Problems such as burning of the carbonaceous powder occur. Of the vibratory feeder, screw conveyor, pan conveyor, etc., the one with the best airtightness is the screw conveyor,
In the screw conveyor, there is a problem to be solved in that the screw shaft is in direct contact with a high-temperature heat-treated material due to its structure, and in addition to the problem of heat resistance, wear due to abrasion is severe and maintenance cost is increased.

Therefore, an object of the present invention is to reduce the reduced iron even when discharging the reduced iron having a high possibility of reoxidation without hindering the operation of the moving hearth type heat treatment furnace and the downstream equipment. A discharge apparatus for a moving hearth type heat treatment furnace and a moving hearth type heat treatment furnace which can be discharged quantitatively and continuously without reoxidation and which can reduce the wear of components. It is to provide an operation method. The present invention is not limited to reduced iron or metallic iron, but is directed to a heat-treated metal-containing material containing a non-ferrous metal or the like.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and in order to solve the above-mentioned problems, a discharge apparatus for a moving hearth type heat treatment furnace according to claim 1 of the present invention is provided. The feature of the adopted means is a discharge device of a moving hearth type heat treatment furnace for discharging an object to be heat-treated from a moving hearth type heat treatment furnace to downstream equipment, wherein the moving hearth type heat treatment furnace is provided in a casing. A concave holding member having a receiving recess for receiving and temporarily holding the object to be heat-treated discharged from the furnace, and reciprocating along the surface of the receiving recess to be held in the receiving recess. And a scraper for discharging the object to be heat-treated into the casing.

According to a second aspect of the present invention, there is provided a discharge apparatus for a moving hearth type heat treatment furnace, wherein the discharging apparatus for a moving hearth type heat treatment furnace is characterized in that, A seal leg is provided between the hearth type heat treatment furnace and the concave holding member for guiding a heat-treated material discharged from the moving hearth type heat treatment furnace to a receiving recess of the concave holding member. .

[0012] The discharging apparatus of the moving hearth type heat treatment furnace according to claim 3 of the present invention is characterized in that the means employed in the discharging apparatus of the moving hearth type heat treatment furnace according to claim 2 is the casing. A gas blowing nozzle for blowing a re-oxidation preventing gas into the inside is connected to the seal leg.

According to a fourth aspect of the present invention, there is provided a discharge apparatus for a moving hearth type heat treatment furnace according to a fourth aspect of the present invention. A screen sizer is disposed between the hearth type heat treatment furnace and the seal leg to select foreign matter in the heat treatment target and discharge the foreign matter to the outside of the system.

According to a fifth aspect of the present invention, there is provided a method for operating a moving hearth type heat treatment furnace, wherein the moving hearth type heat treatment furnace discharges a heat-treated material from the moving hearth type heat treatment furnace to downstream equipment. A method of operating a floor type heat treatment furnace, comprising: receiving a heat-treated object discharged from the moving hearth type heat treatment furnace in a receiving recess of a concave holding member provided in a casing; The scraper is reciprocated along the plane of the place to discharge the object to be heat-treated held in the receiving recess into the casing.

A feature of the means adopted by the method for operating a moving hearth type heat treatment furnace according to claim 6 of the present invention is that in the method for operating a moving hearth type heat treating furnace according to claim 5, At least, a re-oxidation preventing gas for preventing re-oxidation of the object to be heat-treated is blown therein.

According to a seventh aspect of the present invention, there is provided a moving furnace according to any one of the fifth and sixth aspects of the present invention, wherein the roller is characterized by a means adopted by the operating method of the moving hearth type heat treatment furnace. In the method for operating a floor type heat treatment furnace, the object to be heat treated discharged from the moving hearth type heat treatment furnace is received in the receiving recess of the concave holding member through the seal leg.

According to the eighth aspect of the present invention, there is provided a method for operating a moving hearth type heat treatment furnace according to claim 7, wherein the roller is characterized by a means adopted by the method for operating a moving hearth type heat treatment furnace. The amount of the reoxidation preventing gas blown into the casing is controlled by the surface temperature of the object to be heat treated.

According to a ninth aspect of the present invention, there is provided a roller equipped with the method of operating the moving hearth type heat treatment furnace according to any one of the fifth to eighth aspects. In the operation method of the floor-type heat treatment furnace, the discharge amount of the heat treatment target is controlled by adjusting the number of reciprocations of the scraper per unit time.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a discharge apparatus of a moving hearth type reduction furnace as a moving hearth type heat treating furnace according to an embodiment for carrying out a method of operating a moving hearth type heat treating furnace of the present invention will be described. FIG. 1 of the overall perspective view of the target, FIG. 2 of a schematic longitudinal sectional view of the casing with the hopper, and FIG. 3 of the operation explanatory view of the scraper will be described in order.

First, reference numeral 1 shown in FIG. 1 is a moving hearth type reduction furnace having a circular hearth, not shown, which rotates around a vertical axis. On the outer peripheral side surface of the moving hearth-type reduction furnace 1, a raw material charged on the hearth by a charging device (not shown) is heat-treated while the hearth makes one rotation around a vertical axis, That is, a discharge port 11 for discharging the reduced heat-treated material (reduced iron having high reoxidation property or metallic iron having no reoxidation problem), carbonaceous powder, and slag mixture is provided. It is configured to be discharged from the outlet 11 to a discharge device 2 having a configuration described later. Although not shown,
An airtight cylindrical discharge chute communicates with the discharge device 2 from the discharge port 11.

The discharge device 2 includes, for example, refractories, lumps having pellets adhered thereto, exfoliated hearths, and foreign matter when charging raw materials, among the heat-treated materials discharged from the discharge port 11. A plurality of rotating rolls 31 for discharging various foreign substances out of the system are provided in parallel with each other, and include a screen sizer 3 called a roller screen, which is housed in an airtight casing (not shown). A cylindrical seal leg 4 having a material sealing function for guiding a heat-treated material from which foreign matters have been removed by the screen sizer 3 downward, and a lower end of the seal leg 4 is made of reduced iron which is easily reoxidized. Is a plurality (two in this example) of gas injection nozzles 6 for blowing a reoxidation preventing gas for preventing reoxidation, for example, an inert gas such as a nitrogen gas, or an exhaust gas containing no oxidizing gas. (See FIG. 2), and a fixed-quantity discharge device 7 having a configuration and a function to be described later.
And penetrates airtightly through a hopper-equipped casing 5 having a hopper section 51 at the bottom.

Although the shape of the seal leg 4 is cylindrical, it is not limited to this shape as long as it has a material sealing function. For example, the shape may be a rectangular tube. As shown in FIG. 2, the gas injection nozzle 6 communicates with a portion of the seal leg 4 projecting into the casing 5 with the hopper. However, the present invention is not limited to this configuration. -It may be outside the casing 5 with the hopper of the leg leg 4. In other words, the communication position of the gas injection nozzle 6 to the seal leg 4 may be determined in consideration of the maintenance performance of the moving hearth type reduction furnace 1 in the furnace pressure and the like.

The quantitative discharge device 7 is configured as shown in FIGS. That is, the receiving recess 71a
And a receiving pan 71 which is a concave holding member for receiving and temporarily holding the object to be heat-treated discharged from the seal leg 4. Also, a horizontally long flat scraper 72 having a function of reciprocating, that is, swinging along the curved surface of the receiving pan 71 and discharging the object to be heat-treated received in the receiving pan 71 outward on both sides thereof. It has. At each end of the scraper 72, a lower end of a swing arm 73 whose upper end is fixed to a rotating shaft 74 that penetrates the end surface of the casing 5 with the hopper is fixed, and the rotating shaft 74 rotates. It is configured to be rotated by the expansion and contraction operation of the rod of the shaft operation cylinder 75. Of course, the end in the width direction of the receiving pan 71 is fixed to the inner wall of the casing 5 with the hopper or two parallel and vertical wall plates, and the object to be heat-treated spills in the width direction of the receiving pan 71. Care is taken not to fall.

Incidentally, the rotating shaft operating cylinder 75 includes:
It may be driven by any drive source such as hydraulic, pneumatic, and electric drive. In addition, a pinion is externally fitted to the tip of the rotating shaft 74, and a rack that meshes with the pinion is attached to the tip of the rod of the rotating shaft operating cylinder 75, and the rack is reciprocated, whereby the rack is reciprocated. Even if the scraper 72 is swung by rotating the rotating shaft 74, the same function as the rotating shaft operating cylinder 75 can be exerted, and the present invention is not limited to the swing configuration.

The scraper 72 is, as described above,
Since it has a function of discharging the object to be heat-treated to the outside of both sides of the receiving pan 71, if the size of the object to be heat-treated or a foreign substance is large enough to pass through the seal leg 4, the large mass It is not necessary to necessarily provide the screen sizer 3 because the heat treatment target can be discharged without any problem only by the discharge device 2. However, especially when a large lump of the heat-treated substance is discharged from the discharge port 11 at a high frequency, the large lump of the heat-treated substance can be removed by providing the screen sizer 3, so that the scraper 72 can be smoothly swung. This has the effect that it can be activated.

The heat-treated material discharged from the lower discharge port 52 of the hopper section 51 of the hopper-equipped casing 5 is sent to a downstream facility (not shown). By stopping the swing operation of the scraper 72, the heat treatment target can be retained in the receiving pan 71, the seal leg 4, or the hopper portion 51. Even if an emergency stop is performed, a certain buffer function can be exhibited.

Hereinafter, the moving hearth type reduction furnace 1 having the above-described structure will be described.
When the operation of the discharge device 2 is described, when the heat-treated material that has been heat-treated on the hearth is discharged from the discharge port 11, first, the outflow of high-temperature gas from the moving hearth-type reduction furnace 1 is prevented, and the heat-treatment is performed. In order to prevent re-oxidation of the material, a re-oxidation preventing gas such as an inert gas such as a nitrogen gas or an exhaust gas not containing an oxidizing gas is blown into the casing 5 with a hopper from the gas injection nozzle 6 and a discharge port. From 11, the discharge of the heat treatment target is started. The blowing amount of the reoxidation preventing gas is controlled by the level of the temperature of the object to be heat treated.In other words, if the temperature of the object to be heat treated is high, a large amount of the antioxidant gas is blown, while the temperature of the object to be heat treated is If the temperature is low, a small amount of antioxidant gas is blown.

The heat-treated material discharged from the discharge port 12 is removed by the screen sizer 3 to remove a large amount of foreign matter. Of the moving hearth-type reduction furnace 1 by the material sealing function, and the inflow of the downstream gas including the oxidizing gas such as the outside air. It descends in the seal leg 4, falls on the upper surface of the receiving recess 71a of the receiving pan 71 in the casing 5 with a hopper, and accumulates on the upper surface of the receiving recess 71a according to the angle of repose and is temporarily held. .

In the present embodiment, as described above, when the heat treatment target is reduced iron or the like which is easily reoxidized, the gas injection nozzle 6 contains an inert gas such as nitrogen gas or an oxidizing gas. A reoxidation preventing gas such as exhaust gas is blown, but a hydrocarbon-based gas that is a reducing gas, such as natural gas, is blown instead of an inert gas such as nitrogen gas or an exhaust gas containing no oxidizing gas. Can be included. By injecting natural gas from the gas injection nozzle 6, it is possible to prevent a reduction in the metallization rate due to the reoxidation of high-temperature reduced iron among the heat-treated materials in the seal leg 4 and the casing 5 with the hopper. At the same time, the higher the temperature of reduced iron or metallic iron, the more the endothermic decomposition reaction is promoted, so that the surface temperature of reduced iron or metallic iron can be controlled in a self-regulating and simple manner, In addition, carbon is generated near the surface of reduced iron and metallic iron by the decomposition reaction,
There is an effect that it is possible to more effectively prevent the reduced iron and metallic iron from sticking together.

When an abnormally high temperature heat-treated material is discharged from the moving hearth type reduction furnace 1, the surface temperature of the heat-treated material deposited on the upper surface of the receiving recess 71a of the receiving pan 71 or the screen sizer 3 The gas injection nozzle 6 according to the level of the surface temperature of the shell such as the seal leg 4, the scraper 72, or the chute connecting them, or the like.
By performing the emergency cooling by controlling the amount of the reoxidation preventing gas to be blown, the reoxidation of the heat treatment target can be prevented.

When an abnormally high-temperature heat-treated material is discharged from the moving hearth-type reduction furnace 1 or when the high-temperature heat-treated material stays in the discharge device 2 for a long time, the above-mentioned reheating is performed. In addition to cooling the object to be heat treated and preventing re-oxidation by blowing the antioxidant gas, the screen sizer 3, the seal leg 4,
By supplying the powdery carbonaceous material or the lime-based material to the scraper 72 and the like, it is possible to prevent reduced iron or metallic iron, which is a heat treatment target, from sticking together.

Next, by controlling the rotation speed of the scraper 72, the heat-treated object temporarily held on the receiving pan 71 is removed from both ends of the receiving pan 71 in the longitudinal direction. Drain into. In that case,
The rotation speed of the scraper 72 may be controlled by the accumulation level of the heat treatment target on the seal leg 4 or the upper surface of the receiving recess 71a of the receiving pan 71, or may be controlled by the accumulation weight or the change in the weight. It doesn't matter. The object to be heat-treated discharged into the casing 5 with the hopper in this manner is the casing 5 with the hopper.
The hopper portion 51 slides down or rolls down and is supplied from the lower discharge port 52 to the downstream equipment, so that appropriate processing is performed in the downstream equipment.

The method of measuring the deposition level of the object to be heat-treated on the upper surface of the receiving recess 71a of the receiving pan 71 is not particularly limited, but is configured to measure the deposition level of the object to be heat-treated in a non-contact manner. Is preferred. For example, it is conceivable to provide a non-contact gamma ray level meter on the outer surface of the seal leg 4 or the casing 5 with the hopper. It is also conceivable to employ a load cell, a microwave, a capacitance type measuring device, or the like.

As described in detail above, according to the discharge device 2 of the moving hearth type reduction furnace 1 according to the present embodiment, the receiving pan 7
Since 1 and the scraper 72 have a very simple structure, they can be composed only of a high temperature resistant material. The heat resistance is improved by forming the receiving pan 71, the scraper 72 and the rotating roll 31 of the screen sizer 3 into a double cylindrical water-cooled structure, so that the mixture of the discharged reduced iron, the carbonaceous powder and the slag is formed. It can also respond to temperature conditions. Further, the rotating shaft 74 and the driving unit (not shown) do not come into contact with the object to be heat treated, as is well understood from FIGS.

Therefore, the discharge device 2 of the mobile hearth type reduction furnace 1 according to the present embodiment is different from the discharge device of the mobile hearth type reduction furnace according to the prior arts 1 and 2 in that it has a high-temperature open / close valve. Since there is no trouble, there is little trouble, and stable operation can be easily continued. Also, regardless of the high-temperature on-off valve, the scraper 7
Since the object to be heat-treated can be continuously discharged, the reduced iron or metallic iron can be continuously discharged even if a melting furnace is installed on the downstream side. It can be dissolved and can greatly contribute to the improvement of productivity of iron products.

The discharge device 2 of the movable hearth type reduction furnace 1 according to the present embodiment is different from the discharge device of the mobile hearth type reduction furnace according to the conventional examples 2 and 3 in that the material sealing function in the seal leg 4 is provided. And the reoxidation preventing gas, it is possible to cut off the flow of oxidizing gas such as outside air into the moving hearth type reducing furnace 1. Even when the moving hearth type reducing furnace 1 is operated at a negative pressure, Since there is little possibility that an oxidizing gas flows into the moving hearth-type reduction furnace 1, a reduction in the product value due to oxidation of the reduced reduced iron, fusion due to melting of the reduced iron due to heat during the oxidation, In addition, it is possible to reduce the risk that a problem due to the burning of the carbonaceous powder occurs.

In the discharge device of the moving hearth type reduction furnace according to the conventional example 3, the vibration feeder, the screw conveyor, the pan conveyor and the like had problems in high temperature resistance and airtightness. As described above, the discharge device 2 of the moving hearth type reduction furnace 1 includes the receiving pan 71 and the scraper 72.
In addition, the heat resistance can be improved by providing the rotating roll 31 of the screen sizer 3 with a cooling means such as water cooling in a double cylindrical shape, so that it is possible to cope with the temperature conditions of the discharged heat treatment target. In addition, the rotating shaft 74 does not come into contact with the object to be heat-treated while the object is being discharged.

Further, the scraper 72 is in direct contact with the object to be heat-treated, as in the case of the screw shaft of the screw conveyor of the discharging device according to the conventional example 3, but it is plate-shaped and is far more than the screw shaft. Since the structure is simple, the contact pressure is low, and the amount of wear is small, the problem of heat resistance and wear due to wear are small, and there is an excellent economic effect that the maintenance cost of the discharge device 2 is advantageous.

In the above, the moving hearth-type reduction furnace 1 for discharging reduced iron having a high reoxidation property or metallic iron, carbonaceous powder, slag mixture or the like having no reoxidation problem as the heat treatment target.
Has been described as an example. However, not only high-temperature reducible high-temperature reduced iron emission but also heat treatment containing relatively low-reoxidation metallic iron or high-purity metallic iron or non-ferrous metal having substantially no reoxidation problem was performed. Since the technical idea of the present invention can be applied to the discharge of metal-containing materials, the scope of the technical idea of the present invention is not limited by the above-described embodiment. The design can be freely changed without departing from the technical concept of the present invention.

[0040]

As described in detail above, claim 1 of the present invention
According to the moving hearth type heat treatment furnace discharge apparatus according to any one of claims 1 to 4, the moving hearth type heat treatment furnace according to the first or second conventional example, Unlike the discharge device of the above, since it does not have a high-temperature on-off valve, stable operation can be continued. Further, since the discharge of the heat-treating object is performed by reciprocating movement of the scraper, the intermittent interval is shorter than in the case of the high-temperature on-off valve, and it can be supplied to the downstream melting furnace in a more continuous state. Since the stable operation can be continued, the productivity of reduced iron or metallic iron is superior to the case of the discharge apparatus of the moving hearth type heat treatment furnace according to 1 or 2.

Further, the material according to the second conventional example has a material sealing function by a seal leg and a structure in which air is prevented from flowing into the moving hearth type heat treatment furnace by blowing reoxidation preventing gas into the discharging device. Unlike a discharge device of a hearth-type heat treatment furnace, a chute is provided between the moving hearth-type heat treatment furnace and the detachable closed vessel, but the mobile hearth-type heat treatment furnace operates at a negative pressure. Even in the case where the oxidizing gas such as outside air flows into the moving hearth type heat treatment furnace, the reduced iron does not re-oxidize, Thus, there is no problem such as fusing or burning of the carbonaceous powder, so that it is possible to manufacture a product having excellent quality.

The scraper is in direct contact with the object to be heat-treated in the same manner as the screw shaft of the screw conveyor of the discharging device according to the prior art 3, but the plate shape is much simpler than that of the screw shaft. In addition, since the contact pressure is low and the amount of wear is small, there is an excellent economic effect that the maintenance cost is much lower than that of the screw conveyor of the discharging device according to the conventional example 3.

[Brief description of the drawings]

FIG. 1 is a schematic overall perspective view of a discharge device of a moving hearth type reduction furnace according to an embodiment for carrying out a method for operating a moving hearth type reducing furnace of the present invention.

FIG. 2 is a schematic longitudinal sectional view of a casing with a hopper of the discharge device of the moving hearth-type reduction furnace according to the embodiment of the present invention.

FIG. 3 is an operation explanatory view of a scraper of the discharge device of the moving hearth type reduction furnace according to the embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Moving hearth type reduction furnace, 11 discharge ports 2 ... Discharge device 3 ... Screen sizer, 31 ... Rotating roll 4 ... Seal leg 5 ... Casing with hopper, 51 ... Hopper part, 52 ...
Lower discharge port 6 ... Inert gas injection nozzle 7 ... Quantitative discharge device, 71 ... Receiving pan, 71a ... Receiving recess, 72 ... Scraper, 73 ... Swing arm, 74
... Rotating shaft, 75 ... Rotating shaft operating cylinder

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshikatsu Uchida 4-3-1 Bingocho, Chuo-ku, Osaka-shi, Osaka Kobe Steel, Ltd. Osaka branch office (72) Inventor Sumito Hashimoto Chuo-ku, Osaka-shi, Osaka 4-1-3 Bingo-cho Kobe Steel, Ltd. Osaka Branch Office F-term (reference) 4K012 DE02 4K050 AA07 BA01 CA09 CF12 CG22

Claims (9)

[Claims] 1. A discharge device of a moving hearth type heat treatment furnace for discharging an object to be heat-treated from a moving hearth type heat treatment furnace to downstream equipment, wherein the discharge device is discharged from the moving hearth type heat treatment furnace into a casing. A concave holding member having a receiving recess for receiving and temporarily holding the object to be heat-treated, and reciprocating along the surface of the receiving recess to move the object to be heat-treated held in the receiving recess. A discharge device for a moving hearth type heat treatment furnace, further comprising a scraper for discharging into the casing. 2. A sheet guide between the moving hearth type heat treatment furnace and the concave holding member, the heat treatment object discharged from the moving hearth type heat treating furnace being guided to a receiving recess of the concave holding member.
The discharge device of a moving hearth type heat treatment furnace according to claim 1, wherein a leleg is provided. 3. A discharge apparatus for a moving hearth type heat treatment furnace according to claim 2, wherein a gas injection nozzle for injecting a re-oxidation preventing gas into said casing is communicated with said seal leg. 4. A screen sizer is disposed between the moving hearth type heat treatment furnace and the seal leg, for selecting foreign matter in the object to be heat treated and discharging it to the outside of the system. 4. The discharge device of the moving hearth type heat treatment furnace according to 3. 5. A method of operating a moving hearth type heat treatment furnace for discharging a heat treatment target from a moving hearth type heat treatment furnace to downstream equipment, comprising: The heat-treating object held in the receiving recess by reciprocating the scraper along the surface of the receiving recess while receiving and temporarily holding the recess in the receiving recess of the concave holding member provided in the casing. The method for operating a moving hearth type heat treatment furnace, comprising discharging the waste gas into the casing. 6. The method for operating a moving hearth type heat treatment furnace according to claim 5, wherein a reoxidation preventing gas for preventing at least reoxidation of the heat treatment target is blown into the casing. 7. The heat treatment object discharged from the moving hearth type heat treatment furnace is received in the receiving recess of the concave holding member through the seal leg.
Or the operation method of the moving hearth type heat treatment furnace according to any one of the above items 6. 8. The operation of the moving hearth type heat treatment furnace according to claim 7, wherein the amount of the reoxidation preventing gas blown into the casing is controlled by the surface temperature of the heat treatment target. Method. 9. The apparatus according to claim 5, wherein the amount of the heat-treated material discharged is controlled by adjusting the number of reciprocating movements of the scraper per unit time. Operating method of moving hearth type heat treatment furnace.