JP2002062057A - Method for cooling and protecting furnace wall of metallurgical furnace and furnace wall cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a cooling technology for restricting loss and wear of a furnace wall operation at various kinds of molten metal reaction furnace. SOLUTION: A furnace wall operating surface 3, i.e., a portion where a furnace wall 2 contacts with a reaction product in the furnace or high temperature gas is constructed of highly thermal conductive structure and cooling fluid is flowed, whereby a cooling of the furnace wall itself is strengthened, a substantial amount of proper cooling fluid 51 is supplied to the furnace wall operating surface 3 and the region near inside part of the furnace at the operating surface to cause (1) the protection layer formed by the cooling fluid 51 to be made at the surface of the furnace wall operating surface 3. As the supplying system for the cooling fluid 51, (1) a method for injecting the cooling fluid from a water-cooled lance arranged above inside the furnace or from the upper inner wall of the furnace, and (2) a method in which the cooling fluid is injected from the fluid passage passing through the furnace wall from the rear part of the furnace wall operating surface toward the front part of the furnace wall operating surface are carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for suppressing the wear of a furnace wall of a metallurgical furnace including a smelting reduction furnace for ferrous and non-ferrous metal ores, and other molten metal reactors. The present invention relates to a furnace inner wall portion which is exposed to a high-temperature gas atmosphere in a furnace and which is in contact with a bath of a furnace melt or a scattered particle thereof, and a technique for cooling the entire furnace wall corresponding to the furnace inner wall portion. Things. Here, the metallurgical furnace includes a waste combustion melting furnace, a waste melting furnace containing incinerated ash and sludge, and the like.

[0002]

2. Description of the Related Art Erosion due to heat load and slag on the furnace wall of a molten metal reactor is remarkable. In particular, an oxide-based or hydroxide-based metal ore as a raw material, as it is, or after preheating, or after pre-reduction, the carbon material is burned with an oxygen-containing gas and finally reduced to obtain a molten metal, The heat load or slag on the furnace wall of a metal bath type smelting furnace such as a smelting reduction furnace, or a processing furnace that uses lime-based or soda-potassium-based low-melting flux in hot metal de-P / S removal etc. large.

Conventionally, as a water cooling structure technology of a furnace wall in a metallurgical furnace, there are a stave cooler in a blast furnace, a water cooling panel in an electric furnace, and the like. These are known to be overwhelmingly more advantageous than refractory bricks against slag erosion and heat load. However, it is weak against the attack by the molten metal, and the stove cooler of the blast furnace is easily worn out when it comes into contact with hot metal, and in severe cases, the stave cooler may leak water and cause a steam explosion.

On the other hand, the furnace wall is used in a region where the molten metal is mixed with a certain amount of the in-furnace reaction contents with respect to the furnace-wall operating surface, which is the part in contact with the in-furnace reaction contents or high-temperature gas. As the furnace wall structure, for example, Japanese Patent Laid-Open No. 5-983
No. 34 (hereinafter referred to as Prior Art 1),
Japanese Patent No. 87717 (hereinafter referred to as Prior Art 2) discloses a furnace wall having a so-called gas-injected brick structure. That is, Prior Art 1 discloses a technique in which a cooling gas is jetted into a furnace from a boundary between a water-cooled structure having a water-cooled jacket and a refractory brick. Prior art 2 discloses appropriate injection conditions of the cooling gas to be injected into the inside of the furnace.

[0005]

According to the gas injection cooling techniques of the prior arts 1 and 2 described above, the effect of reducing the wear rate of bricks is exhibited, and the life is extended as compared with ordinary bricks. However, since the furnace wall structure is complicated, the construction cost increases, and the total unit price of the furnace wall structure is not reduced. Furthermore, in order to improve the cooling capability of the gas-injected bricks of prior arts 1 and 2 inside the furnace, CWM (Coal Wa) was used.
ter Mixture) and COM (Coal Oi)
l Mixture) Mushroom-like substances are likely to be formed at the nozzle tip and nozzle clogging is likely to occur even when attempting to inject pyrolysis endothermic coal powder or hydrocarbon-based compounds at a high temperature such as high temperature. There was no.

In view of the above situation, an object of the present invention is to extend the life of a furnace wall, simplify a furnace wall structure, reduce construction costs, and thereby reduce the overall cost of a metallurgical furnace furnace wall cooling apparatus and the same. And a method of cooling the furnace wall using the method.

[0007]

Means for Solving the Problems The inventors of the present invention have conducted the following studies from the above viewpoints, and have obtained the following findings.

The basic idea of the furnace wall cooling structure is that the furnace wall operating surface, that is, the furnace inner wall which is in contact with the bath of the furnace reaction melt or its scattered particles and which is exposed to the high temperature gas atmosphere in the furnace. The ambient temperature near the part surface and the furnace wall operating surface
By lowering the melting point of the furnace melt, for example, slag, etc., a solidified adhesion layer of the furnace melt is formed on the surface of the furnace wall operating surface, and the heat insulation effect by the substantial self-coating layer, and the furnace wall operating surface Has been found to be able to exert the effect of suppressing the wear of steel. Further, the furnace wall corresponding to the furnace wall operation surface portion is constructed of a high heat conductive structure, and by appropriately flowing a cooling fluid inside the furnace wall, the cooling of the furnace wall itself in the region is strengthened. In addition, by supplying an appropriate flow rate of an appropriate cooling fluid to the furnace wall operating surface and an area near the operating surface inside the furnace, the protective layer made of the cooling fluid is A thicker layer is formed on the surface of the wall operating surface,
It has been found that a solidification adhesion protective layer made of solidified slag and the like can be formed on the surface of the furnace wall operating surface. As a result, it has been found that the life of the furnace wall can be significantly extended. As a method of supplying the cooling fluid to the furnace wall operating surface and the adjacent area, one is provided from a top-blowing water cooling lance disposed above the furnace or on an inclined inner wall toward the inside of the furnace upper part. A cooling fluid is supplied from a downward nozzle provided on a protruding portion formed on the inner wall of the furnace upper side to the inside of the furnace, and a water cooling lance having a downward nozzle inserted into the furnace through the furnace wall. The other method is to inject a cooling fluid from a flow path penetrating the furnace wall from behind the furnace wall operating surface toward the front of the furnace wall operating surface. It turned out to be effective. In addition, based on the above findings, we studied the types of those having desirable characteristics as a cooling fluid and studied their supply conditions (injection conditions).

The present invention has been made based on the above findings and research results, and the gist is as follows.

[0010] In the method for protecting a furnace wall of a metallurgical furnace according to the first aspect of the present invention, a cooling fluid is blown into the operating surface of the furnace wall of the metallurgical furnace and the vicinity thereof, and the ambient temperature of the operating surface of the furnace wall and the vicinity thereof is reduced. The method is characterized by lowering the melting point of the in-furnace melt to below the melting point to form a solidified deposit of the in-furnace melt on the furnace wall operating surface.

According to a second aspect of the present invention, there is provided a method for protecting a metal wall of a metallurgical furnace according to the first aspect.
The method of using the cooling fluid is characterized in that the cooling fluid is blown from above the furnace wall operating surface to the furnace wall operating surface and the vicinity of the surface.

According to a third aspect of the present invention, there is provided a method for protecting a metal wall of a metallurgical furnace according to the second aspect.
The present invention is characterized in that a cooling fluid is caused to flow through the inside of the furnace wall corresponding to the furnace wall operating surface portion to cool the furnace wall.

According to a fourth aspect of the present invention, there is provided a method for protecting a metal wall of a metallurgical furnace according to the first aspect.
The method of using the cooling fluid is characterized in that the cooling fluid is blown into the furnace wall operating surface and the vicinity thereof by penetrating the furnace wall from the inside of the furnace wall corresponding to the furnace wall operating surface portion. It has.

According to a fifth aspect of the present invention, there is provided a method for protecting a metal wall of a metallurgical furnace according to the fourth aspect.
The present invention is characterized in that a cooling fluid is supplied to the inside of the furnace wall corresponding to the furnace wall operating surface portion to cool the furnace wall.

According to a sixth aspect of the present invention, there is provided an apparatus for cooling a metal wall of a metallurgical furnace, comprising: a fluid injection nozzle for injecting a cooling fluid into an operating surface of the metal wall of the metallurgical furnace and the vicinity of the surface; It is characterized in that a furnace wall operating surface cooling device provided with a cooling fluid supply passage for supplying the cooling fluid is provided.

According to a seventh aspect of the present invention, there is provided an apparatus for cooling a metal wall of a metallurgical furnace, comprising: a fluid injection nozzle for injecting a cooling fluid into an operating surface of the metal wall of the metallurgical furnace and the vicinity of the surface; Furnace wall operating surface cooling device provided with a cooling fluid supply path for supplying the cooling fluid, and an operating surface corresponding portion internally provided with a flow path through which a cooling fluid flows for cooling the inside of the furnace wall And a furnace wall structure.

According to an eighth aspect of the present invention, in the apparatus for cooling a metal wall of a metallurgical furnace according to the sixth or seventh aspect of the present invention, the apparatus for cooling the operating surface of the metal wall of the metallurgical furnace is arranged such that the apparatus for cooling the operating surface of the metal wall is more than the operating surface of the furnace wall. It is characterized in that it has an upper-blowing lance-type structure or a downward-nozzle-type structure that injects the cooling fluid downward, which is disposed above.

According to a ninth aspect of the present invention, in the apparatus for cooling a metal wall of a metallurgical furnace according to the seventh or eighth aspect, the apparatus for cooling the operating surface of the metal wall of the metallurgical furnace is arranged such that the apparatus for cooling the operating surface of the metal wall is more than the operating surface of the furnace wall. It is characterized in that it is incorporated in the furnace wall corresponding to the upper part.

According to a tenth aspect of the present invention, in the furnace wall cooling device for a metallurgical furnace according to the sixth or seventh aspect, the furnace wall operating surface cooling device comprises A fluid injection nozzle for penetrating the inside of the furnace wall and injecting a cooling fluid toward the furnace wall operating surface and its vicinity, and a cooling fluid supply path for supplying the cooling fluid to the injection nozzle Is characterized by having the following.

According to an eleventh aspect of the present invention, in the metallurgical furnace wall cooling device according to any one of the seventh to tenth aspects, the furnace wall structure corresponding to the operating surface has a high heat. It is characterized by being made of a conductive structural material.

According to a twelfth aspect of the present invention, there is provided a furnace wall cooling apparatus for a metallurgical furnace according to the eleventh aspect, wherein the high thermal conductive structural material is mainly composed of carbon or carbon compound, metal, It is characterized by being a ceramic simple substance or a composite material of two or more of them.

According to a thirteenth aspect of the present invention, there is provided a method for cooling a metal wall of a metallurgical furnace according to any one of the sixth to twelfth aspects. A cooling fluid blown into the furnace wall operating surface and the vicinity thereof, nitrogen, carbon dioxide gas,
Water, steam, oil and hydrocarbon compounds, and a process gas recovered in the metallurgical furnace or other industrial production line, one or more substances selected from a group of substances, the cooling fluid It is characterized by using what is contained as a main component.

According to a fourteenth aspect of the present invention, in the method for cooling a metal wall of a metallurgical furnace according to the thirteenth aspect, the cooling fluid blown into the operating surface of the furnace wall and the vicinity of the surface is used as the cooling fluid. Using a multi-phase fluid containing a predetermined granular material, and causing the decomposition endothermic reaction in the metallurgical furnace or manifesting the heat in the metallurgical furnace as the predetermined granular material to be added to the multi-phase fluid. It is characterized by using a material having at least one of the characteristics of having the ability to remove heat in the form of heat.

According to a fifteenth aspect of the present invention, in the method for cooling a metal wall of a metallurgical furnace according to the thirteenth or fourteenth aspect, the amount of heat flowing through the furnace wall at the operating surface of the furnace wall is determined by:
Controlling the flow rate of the cooling fluid blown into the furnace wall operating surface and the vicinity thereof so that the obtained heat flow rate is measured to be equal to or less than a predetermined value by using a heat flow rate detecting means. It is characterized by the following.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The essential condition in the furnace wall cooling technology of a metallurgical furnace according to the present invention is that the temperature of the furnace wall operating surface and the ambient temperature near the furnace wall operating surface are set to be equal to or lower than the melting point of the melt in the furnace. An object of the present invention is to form a solidified adhesion layer of the melt in the furnace on the surface of the furnace wall operating surface. Therefore, in the operation of the metallurgical furnace, conditional cooling is set so that the above conditions are always satisfied. However, in general, furnace wall cooling conditions and their effects in metallurgical furnaces differ depending on the target metallurgical furnace. Therefore, it is generally difficult to uniquely quantify such cooling conditions. Therefore, a method of controlling the cooling condition based on predetermined measurement information during operation or a method of controlling the cooling condition by estimation based on a heat transfer model is adopted.

In the former method, for example, the amount of heat flowing through the furnace wall at the portion of the furnace wall operating surface is measured using a heat flow rate detecting means, and the surface temperature of the furnace wall operating surface is equal to or lower than the melting point of the melt in the furnace. Is controlled to a temperature equal to or lower than a predetermined value. As the latter method, for example, using a general heat transfer model for estimating the furnace inner wall surface temperature, the cooling conditions for maintaining the surface temperature of the furnace wall operating surface at a temperature equal to or lower than the melting point of the furnace melt are determined. Then, a method of controlling the cooling condition in accordance with this is adopted.

As a method for supplying the cooling fluid to the furnace wall operating surface and the vicinity of the furnace wall operating surface, a method of blowing the cooling fluid from above the part is desirable from the viewpoint of the cooling effect and operability. At that time, as a method of blowing the cooling fluid,
Either a method using a so-called top blowing lance, a method using a lance mounted on the furnace wall, or a method using an appropriate nozzle provided on the furnace wall and using the nozzle may be used. As still another method, a cooling fluid supply system capable of penetrating and spraying the inside of the furnace wall corresponding to the furnace wall operating surface portion into the furnace is provided, whereby the furnace wall operating surface and the vicinity thereof are provided. A cooling fluid may be blown.

Here, a cooling fluid is separately flowed into the inside of the furnace wall corresponding to the portion of the furnace wall operating surface, and the furnace wall itself is also cooled. The effect of cooling the atmosphere near the surface can be further enhanced.

Next, an embodiment of the present invention will be described with reference to the drawings.

[1] Furnace Wall Cooling Apparatus The furnace wall cooling apparatus of the present invention is characterized by these embodiments based on Claims 6 and 7.
And the invention according to claim 9 and the invention according to claim 10. That is, according to the eighth and ninth aspects, the apparatus for cooling the furnace wall operating surface and its vicinity and its atmosphere (referred to as “furnace wall operating surface cooling device”) is provided in the furnace wall operating surface portion. While the furnace wall structure (hereinafter referred to as “operating surface corresponding part furnace wall structure”) is disposed in a different place (hereinafter, referred to as “first furnace wall cooling device”), In the invention according to claim 10, the "furnace wall operating surface cooling device" and a component for cooling the furnace wall in the furnace wall operating surface portion are integrally provided in the same furnace wall portion region. (Hereinafter, referred to as “second furnace wall cooling device”). And further, the first furnace wall cooling device, the method of the furnace wall operating surface cooling device is a top-blowing lance type,
It is divided into a furnace wall nozzle type in which a downward nozzle is provided for downwardly injecting a cooling fluid injected from the furnace wall operating surface cooling device, and the arrangement thereof involves a furnace wall in at least some form. Include, for example, both a lance type inserted into the furnace through a furnace wall and a furnace wall nozzle type in which a nozzle is fixed to a furnace inner wall refractory and a nozzle hole faces downward. The height position of the furnace inner wall of the portion where the nozzle is provided may be either a vertical portion or an inclined portion, and may or may not protrude the inner wall portion of the nozzle installation location, and may be determined as appropriate. .

[1-1 First Furnace Wall Cooling Apparatus] [1-1-1 First Furnace Wall Cooling Apparatus-Part 1] FIG.
FIG. 2 is a schematic longitudinal sectional view illustrating a state in which one example (-No. 1) of the first furnace wall cooling device according to the present invention is disposed and built in a metallurgical furnace, and FIG. It is AA arrow sectional drawing. Reference numeral 91 denotes an upper-blowing lance type furnace wall operating surface cooling device. Reference numeral 41 denotes an operating surface corresponding portion furnace wall structure 41 that forms a furnace wall corresponding to three furnace wall operating surfaces. It comprises a conductive structure component 411.

The furnace wall operating surface cooling device 91 is a so-called top-blowing lance type furnace wall operating surface cooling device 91 inserted downward from above in the metallurgical furnace 1 and shown in FIGS. 3 (a) and 3 (b).
FIG. The furnace wall operating surface cooling device 91 of the upper blowing lance type is disposed at a position higher than the furnace wall operating surface 3, and is above or obliquely above the furnace wall operating surface 3 (see FIG. 1) of the metallurgical furnace 1. This is for injecting the cooling fluid 51 from above.

The furnace wall operating surface cooling device 91 is provided with a cooling fluid supply passage 111 for supplying the cooling fluid 51 therein, and has a fluid injection nozzle 1011 at a lower end portion thereof or an outer peripheral portion of an intermediate portion of a lance. A fluid ejection nozzle 1012 is provided. A lance cooling water passage 12 is provided on the outer peripheral portion of the furnace wall operating surface cooling device 91 for ensuring heat resistance and durability from a high temperature atmosphere in the furnace, and cooling water 12a flows. Further, in the furnace wall operating surface cooling device 91, a lance elevating mechanism for moving the lance 13 in and out of the furnace, and a cooling fluid 51 is blown accurately to a target location on the furnace wall operating surface 3 (see FIG. 1). For this purpose, an ejection hole position and direction control mechanism for adjusting the set height and ejection direction of the fluid ejection nozzles 1011 and 1012 is provided. Further, the number and arrangement of the lances 13 constituting the furnace wall operating surface cooling device 91 and the fluid injection nozzle 1
The number and arrangement of the holes 011 and 1012 are appropriately determined depending on the size, shape, capacity, and the like of the furnace body.

On the other hand, the furnace wall structure 41 corresponding to the operating surface corresponds to a part of the furnace wall 2 of the metallurgical furnace 1 corresponding to the three operating surfaces of the furnace wall. It was built with FIG. 4 is a schematic longitudinal sectional view of one high thermal conductive structural component 411, and FIG. 5 is a development view taken along the arrow BB in FIG. The cooling fluid 53 enters from the lower inlet 6 of the flow channel 71, flows through the flow channel 71 inside the high thermal conductive structural component 411, and flows out of the upper outlet 8. Here, the high thermal conductive structure component 411 is disposed over the entire circumference of the furnace wall portion.

The high thermal conductive structural component 411 preferably has a cooling fluid flow passage 71 formed therein and has a structure that is convenient for repair and replacement like a panel type structure. The furnace wall 2 may be integrated with the furnace wall refractory built similarly to the refractory constituting the other parts of the furnace wall 2. High thermal conductive structure component 4 of any type
Reference numeral 11 denotes a structure having a structure capable of providing a sufficient cooling effect by allowing the cooling fluid 53 to flow through the internal flow passage 71 to the furnace wall portion. Therefore, the material constituting the high thermal conductive structure component 411 has a thermal conductivity of 5 kcal / mh ° C. or more, preferably 20 kcal / m.
h.degree. C. or higher, more preferably 100 kcal / mh.degree. C. or higher. The structural material that satisfies these conditions may be a material mainly composed of carbon or a carbon compound, a metal, a ceramic, or a composite material of two or more of them.

Although the shape of the metallurgical furnace 1 in FIGS. 1 and 2 is of the converter type, it may be rectangular depending on the type of metal ore to be smelted in smelting reduction, production scale, other equipment conditions, and the like. It should be designed as appropriate for furnaces or elliptical furnaces.

[1-1-2 First Furnace Wall Cooling Device-Part 2] FIG. 6 shows another example (-Part 2) of the first furnace wall cooling device according to the present invention in a metallurgical furnace. FIG. 7 is a schematic vertical cross-sectional view illustrating a state of being arranged and built, and FIG. 7 is a view taken in the direction of the arrow CC in FIG. 6. Reference numeral 92 denotes a furnace wall working surface cooling device of a furnace wall nozzle type, and reference numeral 42 denotes a working surface corresponding portion furnace wall structure that forms a furnace wall corresponding to three portions of the furnace wall working surface. It is composed of a sexual structure component 421.

The furnace wall operating surface cooling device 92 is provided from the liquid injection nozzle 102 which opens downward on the lower surface of the refractory on the protruding portion of the furnace inner wall located above the furnace wall operating surface 3 of the metallurgical furnace 1. The cooling fluid 52 is blown into the furnace wall operating surface 3 from above or obliquely above. The furnace wall operating surface cooling device 92 has a plurality of furnace wall operating surface cooling device components 921 arranged over the entire circumference of the furnace wall.

Here, a cooling fluid supply path 112 for supplying the cooling fluid 52 is connected to the fluid ejection nozzle 102. The cooling fluid supply path 112 is formed by embedding a metal pipe inside the furnace wall refractory, and is configured to penetrate in the furnace wall thickness direction. Further, as another method of the fluid injection nozzle 102 and the cooling fluid supply path 112, a refractory having both of them formed inside may constitute a furnace wall immediately above three furnace wall operating surfaces. Fluid injection nozzle 102
Is set so that the cooling fluid 52 is blown accurately to the target cooling location on the furnace wall operating surface 3.
Further, the fluid injection nozzle 102 of the furnace wall operating surface cooling device 92
The arrangement of the nozzle and the number and arrangement of the nozzle holes depend on the dimensions of the furnace body.
It is determined as appropriate according to the shape and capacity.

On the other hand, the furnace wall structure corresponding to the part of the furnace wall operating surface 3 (see FIG. 6) is the same as that of the first furnace wall cooling device—part 1 in the furnace wall 2 of the metallurgical furnace 1. Furnace wall operating surface 3
A furnace wall portion corresponding to the part is constituted by a furnace wall operating surface cooling device 42 constructed of a plurality of high thermal conductive structure components 421. As the high thermal conductive structural component 421, the same or similar one as that of the first furnace wall cooling device-No. 1 (reference numeral 41) shown in FIGS. 4 and 5 is suitable. The material of the conductive structure component 421 is also
First furnace wall cooling device-similar to that in Part 1
The furnace wall portion has a structure capable of providing a sufficient cooling effect by flowing a cooling fluid through the internal flow path. Therefore, the high thermal conductive structural component 4
The material constituting 21 has a thermal conductivity of 5 kcal / mh ° C.
As described above, it is preferably limited to 20 kcal / mh ° C or more, more preferably 100 kcal / mh ° C or more.
The structural material that satisfies these conditions may be a material mainly composed of carbon or a carbon compound, a metal, a ceramic, or a composite material of two or more of them.

Although the furnace wall nozzle-type furnace wall operating surface cooling device 92 shown in FIG. 6 is provided so as to protrude from the vertical furnace wall, the device 92 is provided in the metallurgical furnace 1.
The cooling fluid 52 may be jetted downward as in FIG. 6 by making the furnace inner wall near the furnace port inclined inward.

Further, any one of the top-blowing lance type and furnace wall nozzle type furnace wall operating surface cooling devices 91 and 9 described in the above-mentioned first furnace wall cooling device 1 and 2
2 also has an appropriate flow rate of the cooling fluid 51,
To supply 52, a required flow control mechanism is provided.

[1-2 Second Furnace Wall Cooling Apparatus] The second furnace wall cooling apparatus is constituted only by a furnace wall structure corresponding to a furnace wall operating surface portion. FIG. 8 shows a second embodiment according to the present invention.
FIG. 9 is a schematic longitudinal sectional view illustrating a state in which the furnace wall cooling device is disposed and built in the metallurgical furnace 1, and FIG. 9 is a development view taken along the line DD in FIG. This furnace wall cooling device is one in which a furnace wall structure corresponding to three portions of the furnace wall operating surface of the metallurgical furnace 1 is constructed by a plurality of high thermal conductive structure components 431, that is, the high thermal conductive structure 43. This is constructed over the entire circumference of the furnace wall portion. FIG. 10 is a schematic perspective view illustrating an embodiment of one block of the high thermal conductive structure component 431.

As described above, the high heat conductive structure 43 constructed on the furnace wall portion corresponding to the three portions of the furnace wall operation surface 3 includes a structure portion (A) for cooling the furnace wall operation surface 3 and the structure portion (A). It comprises a structural part (B) for cooling the high thermal conductive structure 43 itself, both of which are disposed in the same furnace wall region and have a completely integrated type.

As can be seen from FIGS. 8 and 9, the structure for cooling the furnace wall operating surface 3 and the vicinity thereof is provided from the inside of the high thermal conductive structure 43 which is the furnace wall structure. A fluid injection flow path 14 (see FIG. 10) for injecting the cooling fluid 55 toward the front of the furnace wall operating surface 3, that is, toward the inside of the furnace, and a fluid injection nozzle 103 formed at the distal end thereof. (Injection nozzle type in front of furnace wall). On the other hand, a structure portion for cooling the furnace wall structure itself is provided with a flow path 73 for flowing a cooling fluid 56 by a separate system, which is provided inside the high heat conductive structure 43 which is the furnace wall structure. (See FIG. 10).

FIG. 10 is a schematic perspective view illustrating an embodiment of one block of the high thermal conductive structure component 431 constituting the high thermal conductive structure 43. As shown in FIG. In the wall thickness direction (arrow x direction in the figure),
A fluid ejection flow path 14 for cooling fluid 55 for cooling the furnace wall operating surface 3 and the vicinity thereof is formed, and a fluid ejection nozzle 103 is provided at the tip thereof. At this time, the cooling fluid 55 is supplied via a header box 551 provided on the back of the furnace wall in order to suppress the fluctuation of the flow rate. On the other hand, the high thermal conductive structure component 431
Inside the furnace wall, a flow path 731 of the cooling fluid 56 for cooling the furnace wall structure itself in the vertical direction is provided.

The material of the high thermal conductive structure 43 and the form of the flow paths 73 and 731 of the cooling fluid 56 are the same as those in the above-described first furnace wall cooling device-No. 1 and No. 2 Or similar ones are suitable. The material of the high thermal conductive structure 43 has a thermal conductivity of 10 kcal / mh ° C or more, preferably 40 kcal / mh ° C or more, and more preferably 200 kcal / mh ° C or more in order to exhibit a sufficient cooling effect. Limited to those. The structural material that satisfies these conditions may be a material mainly composed of carbon or a carbon compound, a metal, a ceramic, or a composite material of two or more of them.

As the metal species desirable as the structural material of the high thermal conductive structure in the first and second furnace wall cooling devices, iron, copper, and alloys of these metals satisfy the above heat transfer characteristics, It is also desirable in terms of durability and material cost.

[2] Furnace Wall Cooling Method The above-mentioned first or second furnace wall cooling device is installed in a metallurgical furnace such as an ore smelting reduction furnace or other molten metal reaction furnace, and is appropriately used. Thereby, in the operation of the metallurgical furnace, the effect of suppressing furnace wall wear is exhibited, and more stable operation is performed.

The first furnace wall cooling device is installed in a metallurgical furnace as described above.

Each cooling fluid 51 blown from the fluid injection nozzles of the furnace wall operating surface cooling devices 91 (see FIG. 1) and 92 (see FIG. 6) to the furnace wall operating surface and its vicinity.
And 52 were selected from a group of substances consisting of nitrogen, carbon dioxide, water, steam, oil and hydrocarbon compounds, and process gases recovered in the metallurgical furnace or other industrial production lines. A substance containing at least one substance as a main component of the cooling fluid is used. This cooling fluid is mixed with a powder of a substance capable of causing a decomposition endothermic reaction in a high-temperature atmosphere in a metallurgical furnace or capable of releasing heat in a metallurgical furnace in the form of sensible heat. Is more effective. Here, as such a powder, it is desirable to use at least one of coal powder, coke breeze, metal oxide powder, and metal carbide powder. These are also inexpensive.

By using the above-mentioned fluids as the cooling fluids 51 and 52 and using a multi-phase fluid containing the above-mentioned powdery material, the temperature of the furnace wall operating surface and the ambient temperature near the surface can be greatly reduced. As a result, an adhesion layer such as slag can be stably formed on the furnace wall surface. In addition, by blowing the cooling fluid onto the furnace wall operating surface, a protective layer of the cooling fluid can be formed on the surface of the furnace wall operating surface. No contact or overcoating. In this way, the life of the metal wall of the metallurgical furnace is remarkably improved.

The cooling effect of the furnace wall becomes more remarkable as the specific heat and the decomposition heat absorption of the cooling fluid are larger. In addition, by the appropriate injection conditions and injection flow rate conditions of the cooling fluid, the effect of forming a protective layer for preventing the furnace melt from contacting the furnace wall is further improved.

On the other hand, the furnace wall structure 41 (FIG. 1)
) And 42 (see FIG. 6) as the types of cooling fluids for cooling the inside of the furnace wall, such as water and oil.
A material that is inexpensive and has a large cooling effect due to heat transfer is desirable.

Next, similarly to the first furnace wall cooling device, the second furnace wall cooling device is installed in the metallurgical furnace as described above. In this case, the furnace wall cooling method for exerting the effect of suppressing the wear of the furnace wall of the metallurgical furnace by appropriately using the second furnace wall cooling device is also provided by the metallurgy equipped with the first furnace wall cooling device. Its remarkable effect can be exerted by the same use method as in the furnace. That is, it is as follows.

A cooling fluid 55 (see FIGS. 8 and 10) sprayed from inside the high thermal conductive structure 43 (see FIG. 8) toward the front of the furnace wall operating surface 3, that is, toward the inside of the furnace.
As one or more selected from the group of substances consisting of nitrogen, carbon dioxide, water, steam, oil and hydrocarbon compounds, and process gas recovered in the metallurgical furnace or other industrial production lines. A substance containing a substance as a main component of the cooling fluid is used. This cooling fluid is mixed with a powder of a substance capable of causing a decomposition endothermic reaction in a high-temperature atmosphere in a metallurgical furnace or capable of releasing heat in a metallurgical furnace in the form of sensible heat. Is more effective. Here, as such powder, it is desirable to use one or more of coal powder, coke breeze, metal oxide powder, metal hydroxide powder and metal carbide powder. These are also inexpensive.

By using the above-mentioned fluid as the cooling fluid 55 and using a multiphase fluid containing the above-mentioned powdery material, the operating temperature of the furnace wall and the ambient temperature near the surface can be greatly reduced. As a result, an adhesion layer such as slag can be stably formed on the furnace wall surface. In addition, by blowing the cooling fluid onto the furnace wall operating surface, a protective layer of the cooling fluid can be formed on the surface of the furnace wall operating surface. No contact or overcoating. In this way, the life of the metal wall of the metallurgical furnace is remarkably improved.

The cooling effect of the furnace wall becomes more remarkable as the specific heat and the decomposition heat absorption of the cooling fluid are larger. In addition, by the appropriate injection conditions and injection flow rate conditions of the cooling fluid, the effect of forming a protective layer for preventing the furnace melt from contacting the furnace wall is further improved.

On the other hand, a cooling fluid 56 (see FIGS. 8 and 10) for cooling the inside of the furnace wall corresponding to the furnace wall operating surface portion.
As for the type, it is desirable to use a material that is inexpensive and has a large cooling effect characteristic by heat transfer, such as water or oil.

In both the first furnace wall cooling device and the second furnace wall cooling device, the furnace wall of the metallurgical furnace is cooled by the above-described method. At this time, it is possible to appropriately control the flow rate of the cooling fluid blown into the furnace wall operating surface and the vicinity of the surface in accordance with the type of the material constituting the fluid, thereby cooling the furnace wall at the furnace wall operating surface portion. It is important to perform the process sufficiently and to sufficiently and stably exhibit the effect of suppressing furnace wall wear. For that purpose, the amount of heat flowing through the furnace wall in the furnace wall operating surface portion in the thickness direction is measured by using a heat flow detecting means, and the measured fluid does not exceed a certain value. Control the flow rate. Here, the furnace wall heat flow rate is determined from the temperature distribution measurement result of the furnace wall or the temperature rise measurement result of the cooling fluid. By doing so, more efficient furnace wall cooling can be performed without supplying the cooling fluid more than necessary. It is desirable that the above-mentioned constant value of the heat penetration rate, that is, the upper limit value, be determined in accordance with the type and equipment specifications of the metallurgical furnace, the condition of the furnace wall of the metallurgical furnace, and the operating conditions of the heat.

In general, in a smelting reduction furnace for iron ore or the like, the furnace wall heat load when performing secondary combustion in the furnace is 100 to 30.
The average level is about 0 Mcal / m ² h, but under operating conditions in which molten metal such as slopping directly attacks the cooling panel, the heat load is 1 Gcal / m ² h.
h or more, and may reach 10 Gcal / m ² h. Basically, when the furnace wall of the smelting reduction furnace is composed of a water-cooled panel or the like, the surface thereof may be several tens mm in some cases.
Although a degree of slag adhesion layer is recognized,
When a thermal load of 0 Gcal / m ² is applied, the risk of panel breakage increases significantly. In this case, the flow rate of the cooling water in the panel is usually about 2 to 7 m / sec.
If the operation is performed before and after ec, the durability can be expected to be slightly improved with respect to the heat load, but the effect is small with respect to the attack of the molten metal. is not.

On the other hand, a stable slag adhered layer can be formed by the furnace wall cooling device or the cooling and protecting method thereof according to the present invention. , 100 m / sec or more, desirably near the speed of sound, the direct contact of the molten metal with the furnace wall can be suppressed. Therefore, it is extremely effective in extending the life of a water-cooled panel or the like. Further, the flow rate of the cooling water inside the panel can be sufficiently controlled within a range of about 2 to 7 m / sec, and the heat loss to the furnace wall can be reduced.

Although the embodiments of the present invention have been described above with reference to the so-called metallurgical furnace wall, which is composed of a smelting reduction furnace for ferrous and non-ferrous metal ores and a molten metal reactor, the present invention is not limited to waste metal. Also applies to melting furnaces in which the melt in the furnace includes molten metal, molten slag, molten salt, etc. in the processing process, including combustion melting furnaces, waste melting furnaces containing incinerated ash and sludge, etc. Is what you can do.

[0064]

EXAMPLES The present invention will be further described with reference to examples.

[Test 1] The first test of the present invention shown in FIGS.
100t-pig iron equipped with equipment according to the furnace wall cooling system of
In the iron ore smelting reduction furnace of Japan, a test operation series was performed under five conditions (Examples 1 to 5) according to the furnace wall cooling method of the present invention, and the life of the furnace wall at the operating surface of the furnace wall was measured. For comparison, a test operation series outside the scope of the present invention was performed under two conditions (Comparative Example 1 and Comparative Example 2), and the furnace wall life was measured in the same manner.

Table 1 summarizes the test conditions and test results.

[0067]

[Table 1]

As the cooling device for the operating surface of the furnace wall, a device of the top blowing lance type is used, and the type and flow rate of the cooling fluid, the hole diameter of the cooling fluid injection nozzle, and the high thermal conductivity structure of the furnace wall structure corresponding to the operating surface. The type of the material and the type of the cooling structure of the furnace wall are as shown in Table 1. However, Comparative Example 1
In Examples 2 and 3, the furnace wall operating surface cooling device was not used. According to the above test results, in the examples, good results were obtained for the life of the furnace wall operating surface in each of the examples. Also, among the examples, by appropriately setting the conditions of the furnace wall cooling device and the furnace wall cooling method using the same within the scope of the present invention, the life of the furnace wall operating surface may be surprisingly long. Understand.

[Test 2] In a 100 t-pig / day iron ore smelting reduction furnace equipped with equipment according to the second furnace wall cooling device of the present invention shown in FIGS. According to the method, the test operation series was performed under five conditions (Examples 6 to
In Example 10), the life of the furnace wall at the furnace wall operating surface was measured. For comparison, a test operation series outside the scope of the present invention was performed under two conditions (Comparative Example 3 and Comparative Example 4), and the furnace wall life was measured in the same manner.

Table 2 summarizes the test conditions and test results.

[0071]

[Table 2]

The type and flow rate of the injection cooling fluid in front of the furnace wall operating surface, the hole diameter of the cooling fluid injection nozzle, the type of high thermal conductive structural material, the type of the furnace wall cooling structure, and the flow The types and flow rates of the cooling fluids used are as shown in Table 2. However, in Comparative Example 3, the injection cooling fluid to the front of the furnace wall operating surface was not used. According to the above test results, in the examples, good results were obtained for the life of the furnace wall operating surface in each of the examples. In addition, similarly to the results in Test 1, the life of the operating surface of the furnace wall can be reduced by appropriately setting the conditions of the furnace wall cooling device and the furnace wall cooling method using the same within the scope of the present invention. It turns out that it becomes astoundingly long.

[0073]

As described above, according to the present invention,
Furnace wall cooling device and the like, which can significantly extend the life of the furnace wall of smelting reduction furnaces and other metallurgical furnaces of molten metal reactors, and can significantly contribute to stabilization of metallurgical furnace operations and reduction of operating costs. Can be provided, and an industrially useful effect is brought about.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal cross-sectional view illustrating a first furnace wall cooling device according to the present invention—a state in which a furnace wall operating surface cooling device of a component (top blowing lance type) is disposed in a metallurgical furnace and built. FIG.

FIG. 2 is a sectional view taken along the line AA in FIG.

FIG. 3 is a schematic longitudinal sectional view of an upper-blowing lance type furnace wall operating surface cooling device.

FIG. 4 is a schematic longitudinal sectional view of a high heat conductive structure of a first furnace wall cooling device according to the present invention—part 1 (upper blowing lance type).

FIG. 5 is a development view taken along the arrow BB in FIG. 4;

FIG. 6 is a schematic longitudinal section illustrating a first furnace wall cooling apparatus according to the present invention—part 2 (furnace wall type nozzle type), in which a furnace wall operating surface cooling apparatus is arranged in a metallurgical furnace and built. FIG.

7 is a view as viewed from the direction of the arrow CC in FIG. 6;

FIG. 8 is a schematic longitudinal sectional view illustrating a state in which a second furnace wall cooling device according to the present invention is disposed in a metallurgical furnace.

FIG. 9 is a development view as viewed in the direction of the arrow DD in FIG.

FIG. 10 is a schematic perspective view illustrating one embodiment of the high thermal conductive structure component in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Metallurgical furnace 2 Furnace wall 3 Furnace wall working surface 41 Working surface corresponding part furnace wall structure (first furnace wall cooling device-
Part 1) 411 High thermal conductive structure component (first furnace wall cooling device-Part 1) 42 Working surface corresponding portion furnace wall structure (First furnace wall cooling device-)
Part 2) 421 High thermal conductive structure component (first furnace wall cooling device-Part 2) 43 High thermal conductive structure component (second furnace wall cooling device) 431 High thermal conductive structure (second Furnace wall cooling device) 51 Cooling fluid (top blowing lance type) 52 Cooling fluid (furnace nozzle type) 53 Cooling fluid (furnace wall interior) 55 Cooling fluid (injection from inside furnace wall to front of operating surface) 56 Cooling fluid (inside the furnace wall) 6 Inlet 7 Flow path 8 Outlet 91 Furnace wall operating surface cooling device (top blowing lance type) 911 Furnace wall operating surface cooling device component (upper blowing lance type) 92 Furnace wall operating surface cooling device (Furnace wall nozzle type) 921 Furnace wall operating surface cooling device components (furnace wall nozzle type) 1011, 1012 Fluid injection nozzle (top blowing lance type) 102 Fluid injection nozzle (injection nozzle type downward from projecting furnace wall) 103 Fluid injection nozzle (injection nozzle type to front of furnace wall) 111 Cooling fluid supply path (top blowing lance type) 112 Cooling fluid supply path (furnace wall nozzle type) 12 Lance cooling water passage 12a Cooling water 13 Lance 14 Fluid Injection channel

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masahiro Kawakami 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Inside Nihon Kokan Co., Ltd. (72) Inventor Mitsuhiro Yamanaka 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan (72) Inventor Takeshi Sekiguchi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Nihon Kokan Co., Ltd. (72) Inventor Masayuki Watanabe 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan F term in the company (reference) 4K002 BC10 4K051 AA02 AB03 BB07 HA01 HA03 HA06 HA16 HA18

Claims (15)

[Claims] 1. A cooling fluid is blown into a furnace wall operating surface of a metallurgical furnace and the vicinity of the surface thereof to lower the ambient temperature of the furnace wall operating surface and the vicinity of the surface to below the melting point of the furnace melt.
A method for protecting a furnace wall of a metallurgical furnace, wherein a solidified deposit of the melt in the furnace is formed on the furnace wall operation surface. 2. The method for protecting a furnace wall of a metallurgical furnace according to claim 1, wherein the cooling fluid is blown into the furnace wall working surface and its vicinity from above the furnace wall working surface. 3. The furnace for a metallurgical furnace according to claim 2, further comprising cooling the furnace wall by flowing a cooling fluid into the inside of the furnace wall corresponding to the furnace wall operating surface portion. Wall protection method. 4. The cooling fluid is blown into the furnace wall from the inside of the furnace wall corresponding to the furnace wall operating surface portion, and the cooling fluid is blown into the furnace wall operating surface and the vicinity of the surface. The method for protecting a furnace wall of a metallurgical furnace according to claim 1. 5. A furnace for a metallurgical furnace according to claim 4, further comprising cooling the furnace wall by flowing a cooling fluid into the inside of the furnace wall corresponding to the furnace wall operating surface portion. Wall protection method. 6. A fluid injection nozzle for injecting a cooling fluid into a furnace wall operating surface of a metallurgical furnace and the vicinity thereof, and a cooling fluid supply passage for supplying the cooling fluid to the fluid injection nozzle. A furnace wall cooling device for a metallurgical furnace, comprising a furnace wall operating surface cooling device provided with: 7. A fluid injection nozzle for injecting a cooling fluid into a furnace wall operating surface of a metallurgical furnace and the vicinity thereof, and a cooling fluid supply path for supplying the cooling fluid to the fluid injection nozzle. A furnace wall operating surface cooling device comprising: and an operating surface corresponding portion furnace wall structure having a flow path through which a cooling fluid for cooling the inside of the furnace wall flows is provided, Furnace wall cooling system for metallurgical furnaces. 8. The furnace wall operating surface cooling device has an upper blowing lance type structure or a downward nozzle type structure that injects the cooling fluid downward, provided above the furnace wall operating surface. The furnace wall cooling device for a metallurgical furnace according to claim 6, wherein: 9. The furnace of a metallurgical furnace according to claim 7, wherein the furnace wall operating surface cooling device is incorporated in a furnace wall corresponding to a portion above the furnace wall operating surface. Wall cooling device. 10. The furnace wall operating surface cooling device, wherein a fluid for injecting a cooling fluid through the inside of the furnace wall at the furnace wall operating surface portion and injecting the cooling fluid toward the furnace wall operating surface and the vicinity of the surface is provided. The furnace wall cooling device for a metallurgical furnace according to claim 6, further comprising an injection nozzle and a cooling fluid supply path for supplying the cooling fluid to the injection nozzle. 9. 11. The apparatus for cooling a furnace wall of a metallurgical furnace according to claim 7, wherein the furnace wall structure corresponding to the operating surface is made of a high thermal conductive structural material. . 12. The metallurgy according to claim 11, wherein the main component of the high thermal conductive structural material is carbon, a carbon compound, a metal, a simple substance of ceramics, or a composite material of two or more thereof. Furnace wall cooling system. 13. A method for cooling a furnace wall of the metallurgical furnace during operation using the furnace wall cooling device for a metallurgical furnace according to any one of claims 6 to 12, wherein the furnace wall operating surface and the furnace wall operating surface are cooled. As a cooling fluid to be blown into the vicinity of the surface, nitrogen, carbon dioxide gas, water, steam, oil and hydrocarbon compounds, and a process gas collected from the metallurgical furnace or other industrial production lines, A method for cooling a metal wall of a metallurgical furnace, comprising using at least one substance selected from the above as a main component of the cooling fluid. 14. A multi-phase fluid containing a predetermined granular material is used as the cooling fluid blown into the furnace wall operating surface and the vicinity of the surface, and the predetermined granular material to be added to the multi-phase fluid is used as the predetermined granular material. To cause a decomposition endothermic reaction in the metallurgical furnace, or to have the ability to remove the heat in the metallurgical furnace in the form of sensible heat, using a material having at least one of the characteristics The method for cooling a furnace wall of a metallurgical furnace according to claim 13, wherein: 15. The amount of heat flowing through the furnace wall at the furnace wall operating surface portion is measured by using a heat flow detecting means, and the furnace wall operating is controlled so that the obtained heat flow becomes a predetermined value or less. The method for cooling a furnace wall of a metallurgical furnace according to claim 13, wherein a flow rate of the cooling fluid blown onto the surface and the vicinity of the surface is controlled.