KR20080057104A - Body structure of reheating furnace - Google Patents

Abstract

A reheating furnace body structure with improved thermal efficiency is provided to improve thermal efficiency of the reheating furnace as a whole by increasing radiation area and gas residence time having an effect on thermal efficiency, thereby increasing temperature of a body of a reheating furnace. A reheating furnace body structure(1) with improved thermal efficiency comprises: an outer layer member(10) provided at an outer side of a reheating furnace; a refractory layer(20) formed on an inner side of the outer layer member; and a refractory structure(50) formed on an inner side of the refractory layer to increase radiation area or gas residence time. A reheating furnace body structure with improved thermal efficiency comprises: an outer layer member provided at an outer side of a reheating furnace; a refractory layer formed on an inner side of the outer layer member; and a surface curved refractory layer formed on an inner side of the refractory layer to increase radiation area or gas residence time. A reheating furnace body structure with improved thermal efficiency comprises: an outer layer member provided at an outer side of a reheating furnace; a refractory layer formed on an inner side of the outer layer member; a refractory structure formed on an inner side of the refractory layer to increase radiation area or gas residence time; and a surface curved refractory layer formed on at least a portion of the refractory structure to increase radiation area or gas residence time by cooperating with the refractory structure. The refractory layer includes at least two layers of fire brick(30), or the fire brick and a castable layer(40).

Description

Body Structure of Reheating Furnace with Improved Thermal Efficiency

1 is a schematic view showing a typical heating furnace

2 is a schematic view for explaining the increase in heat transfer area in the heating furnace.

3 is a plan sectional view showing a furnace structure of a conventional heating furnace.

Figure 4 is a plan sectional view showing an embodiment of the furnace structure of the furnace with improved thermal efficiency according to the present invention

Figure 5 is a plan sectional view showing another embodiment of the furnace structure of the furnace with improved thermal efficiency according to the present invention;

6 is a plan sectional view showing a merged embodiment of FIGS. 4 and 5.

Explanation of symbols on the main parts of the drawings

1 .... furnace 10 of the present invention.

20 .... Fireproof Floor 30,40 ... Firebrick

50 .... fireproof structure 60 .... surface curved fireproof layer

The present invention relates to a furnace structure of a furnace with improved thermal efficiency, and more particularly, by improving the furnace structure of a furnace, increasing the radiant area and gas residence time affecting the efficiency of the furnace to raise the furnace temperature. The present invention relates to a furnace structure of a furnace that improves the thermal efficiency of the overall furnace.

In general, in the hot rolling process of steel mills, a heating furnace is used to heat a rolled material such as a slab produced in a casting process.

That is, the management of the metallurgical conditions, dimensions and appearance of the corresponding specification of the rolled material is actually done in the rolling line, but for more accurate management, the heating furnace heats the material to the desired heating temperature, as well as the material. Naturally, uniform heating in the length and width directions is a critical quality control factor.

This is because the uniform heating reduces the variation of the material in metallurgy and the thickness deviation in terms of dimension control.

1 shows the overall structure of a known heating furnace.

That is, as shown in Figure 1, the heating furnace 100 is continuously arranged from the charging side to the extraction side in the furnace body 150, the loading slab (S) to be heated thereon is mounted on the skid beam That is, the fixed beam 160 and the moving beam 170 are disposed.

Therefore, while the material such as the slab S charged in the heating furnace 100 is heated, the moving beam 170 raises, moves forward, descends, and reverses a series of slabs S seated on the fixed beam 160. By moving the furnace in stages from charging side to extraction side.

On the other hand, as shown in Figure 1, the internal space of the heating furnace 100, such as the direction in which the moving beam 170 passes, the furnace entrance, charging zone (charging zone) 110, preheating zone (preheating zone) 120, a heating zone (130) and a soaking zone (soaking zone) (140).

Accordingly, the temperature rise rate and residence time in the charging zone, preheating zone, heating zone and residence time in the cracking zone are controlled according to the initial temperature of the charging slab S and the final temperature required for extraction. do.

Each control zone is provided with burners (B1) and (B) on the side and nose portion side for raising the temperature, heating and cracking.

On the other hand, it can be seen from Figure 2 and the following equation 1 that the heat transfer of the heating furnace has a significant relationship with the radiant area.

That is, in FIG. 2 and the above Equation 1, it can be seen that the heat transfer of the heating furnace mainly depends on the radiation, and this radiation increases with the radiation area.

For example, Equation 1 represents the energy transferred from the plane of '1' to the plane of '2', where dA is a small area, r is a distance, and θ is an angle of radiation.

Accordingly, it can be seen from FIG. 2 and Equation 1 that the radiation area may be increased in order to increase the transmitted energy.

3, the structure of the furnace body 150 of the conventional heating furnace is shown in a plan sectional view.

That is, as shown in Figure 3, the conventional conventional furnace furnace, that is, the wall 150 is fireproof attached to the outermost shell 152 layer and its inner surface in order from the outside of the furnace to the inside of the furnace in sequence It is composed of a brick 154 layer, a castable 156 layer formed on the firebrick.

In this case, depending on the furnace structure, the firebrick may be composed of two layers, and another castable fireproof layer 158 may be further provided therein.

However, in such a furnace body (wall) 150 structure of the conventional heating furnace, as shown in FIG. 3, the castable 156 layer or the castable fireproof layer (inside the furnace structure, in particular, the heating furnace) 158) The surface was formed of a generally flat surface rather than a structure for increasing the radiation area described with reference to FIG. 2 and Equation 1 above.

Furthermore, the increase in residence time while contacting the furnace wall (surface) where the high temperature atmosphere gas inside the furnace is possible helps the furnace temperature rise, but conventionally no structure has been provided to increase such gas residence time. It was.

In this case, reference numeral 180 in FIG. 1 is a sensor for measuring a low temperature (thermocouple).

Accordingly, there has been a demand for a furnace structure of a furnace that improves thermal efficiency by increasing the radiant area through the furnace wall (surface), or by increasing the residence time of the gas.

The present invention has been made in order to solve the various problems as described above, the object of the present invention is to increase the radiant area and gas residence time affecting the thermal efficiency by increasing the temperature of the furnace, the overall thermal efficiency of the furnace It is to provide a furnace structure of a heating furnace which has improved.

As a technical aspect for achieving the above object, the present invention, in the furnace structure of the furnace, the outer shell member provided on the outside of the furnace;

A fireproof layer provided inside the shell member; And,

A fireproof structure provided inside the fireproof layer and configured to increase the radiation area or the gas residence time;

It provides a furnace structure of the furnace configured to improve the thermal efficiency, including.

In another aspect, the present invention, in the furnace structure of the furnace, the outer shell member provided on the outside of the furnace;

A fireproof layer provided inside the shell member; And,

A curved surface refractory layer which is provided inside the refractory layer and configured to increase radiation area or gas residence time;

It provides a furnace structure of a heating furnace comprising a.

And, as another technical aspect, the present invention, in the furnace structure of the furnace, the outer shell member provided on the outside of the furnace;

A fireproof layer provided inside the shell member;

A fireproof structure provided inside the fireproof layer and configured to increase the radiation area or the gas residence time; And,

A surface curved refractory layer provided on at least a portion of the refractory structure and configured to increase radiation area or gas residence time in cooperation with the refractory structure;

It provides a furnace structure of a heating furnace comprising a.

In this case, the fireproof layer may be provided as at least two layers of a firebrick or a firebrick and a castable layer.

And, the surface curved refractory layer is attached to the refractory layer or the refractory structure, the surface is curved, the castable molding to increase the radiated area and increase the gas retention time or to generate gas vortex to smooth the temperature rise of the furnace May be provided in layers.

Here, the refractory structure may be provided such that unit cells having a space formed inside the polygons are formed in a single plate shape to increase radiation area and increase gas residence time or vortex in the space.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First, Fig. 4 shows a first cross-sectional view of a furnace structure of a heating furnace having improved thermal efficiency according to the present invention.

That is, as shown in Figure 4, the furnace structure 1 of the heating furnace of the present invention, the outer shell member 10 provided on the outside of the heating furnace, and the fireproof layer (inside) provided inside the outer shell member 10 ( 20) and a refractory structure 50 provided inside the refractory layer 20 and configured to increase radiation area or increase gas residence time.

At this time, the shell member 10 is usually composed of a steel shell of a certain thickness.

In addition, as shown in FIG. 4, the fireproof layer 20 may be composed of two layers of the firebrick 30 or the firebrick 30 and the castable layer 40.

For example, such a fireproof layer is formed by joining a firebrick such as a horizontal type or a vertical type. The firebrick uses a known firebrick having high fire resistance, high strength and thermal shock resistance, and strong chemical corrosion. Such refractory bricks are often used for the burnout of steel.

Next, the fireproof layer 20 may be configured of the firebrick 30 and the castable layer 40.

For example, the refractory brick is as described above, and the castable layer 40 (Castable Refractories) is a refractory aggregate composed of a particle size as a refractory material, and an appropriate binder is added, and water, a specific liquid is added, kneaded, and fired to be It may be provided as a layer, and in recent years, the method of spraying the castable, which is a refractory material, on the wall through an injector, etc. is mainly used, and the fired body is sprayed to harden to express strength and fire resistance.

Next, as shown in detail in Figure 4, the refractory structure 50 is provided on the inside of the heating furnace to the surface of the refractory layer, the unit cells formed with a plurality of spaces 52 formed inside the polygonal It is a refractory structure formed into a plate shape.

Therefore, the refractory structure of the present invention may be provided with units of a predetermined size in order to adhere to the refractory layer 20, for example, by spraying the castable to the refractory layer and attaching the refractory structures before curing thereof. It will also be possible to construct.

In particular, since the fire resistant structure 50 of the present invention has a structure in which rectangular spaces 52 are formed inward, vortices of atmospheric gas in the furnace passing through these spaces are generated, and the residence time of the gas is increased. In particular, the radiation area will be further increased than the conventional flat type. Such a fireproof structure is also called honeycomb.

Next, Fig. 5 shows a second embodiment of the furnace structure of the heating furnace of the present invention. In FIG. 5, the fireproof layer of the shell member 10, the firebrick, and the castable layer is omitted.

That is, as shown in FIG. 5, the assembly structure 1 of the second heating furnace of the present invention includes an outer shell member 10 provided outside the heating furnace and a fireproof layer provided inside the outer shell member 10. (20) and the curved surface refractory layer 60, which is provided inside the refractory layer 20 and configured to increase radiant area increase or gas residence time, is characterized in that it is configured.

At this time, the shell member and the fireproof layer are as described in the first embodiment.

On the other hand, in the furnace structure of the furnace of the second embodiment of the present invention, the surface curved fireproof layer 60 is provided on the surface of the refractory brick or castable layer, which is the fireproof layer, or on the fireproof structure 50. The surface 62 is curved in contact with the inner space of the furnace.

Accordingly, the curved surface 62 of the fire resistant layer generates vortices of the gas while increasing the radiation area and increasing the gas contact residence time, which generally increases the temperature rise of the furnace body. May be provided as a castable molding layer.

That is, although not shown in a separate drawing on the firebrick or castable layer, which is the second layer of the fireproof layer 20, protrusions may be formed at predetermined intervals to form the surface curved fireproof layer 60.

Alternatively, as shown in FIG. 5, the refractory brick or castable layer, which is a fireproof layer, may be provided at a predetermined interval to form the surface curved fireproof layer 60 as a supporting base surface.

Therefore, the protrusion of the refractory brick or the refractory structure serves as a support for the curved surface refractory layer 60.

Meanwhile, as shown in FIG. 5, the surface curved fireproof layer 60 increases the gas contact surface of the existing L0 to L1 and increases the radiation area, thereby increasing the contact area of the atmosphere gas in the furnace. The curved surface refractory layer 60 increases the gas contact area to increase the thermal efficiency in the furnace through the elevated temperature.

At the same time, the curved portion of the surface curved fire resistant layer 60, for example, while passing through the concave or protruding portion generates a vortex in the curved surface to increase the residence time of the gas passing through this portion.

Accordingly, the temperature increase in the furnace is actively progressed by increasing the residence time of the gas.

Meanwhile, the surface curved fireproof layer 60 of the present invention may be provided as a castable fireproof layer constructed by spraying as described above.

Next, FIG. 6 is a plan sectional view showing a merged embodiment of FIGS. 4 and 5.

That is, as shown in FIG. 6, the furnace structure of the furnace of the third embodiment of the present invention includes an outer shell member 10 provided on the outer side of the furnace and a fireproof layer provided on the inner side of the outer shell member 10. 20) and the refractory structure 50 provided inside the refractory layer 20 and configured to increase the radiation area or increase the gas residence time, and the refractory structure provided with at least a portion of the refractory structure 20. A surface curved fire resistant layer 60 configured to cooperate with each other to increase the radiation area or increase the gas retention time is provided.

For example, when the refractory structure 50 and the surface curved refractory layer 60 are provided at the same time, it is realized in the low temperature region of the heating furnace to increase the temperature increase effect and to allow temperature uniformity with other parts. Would be desirable.

Thus, as shown in FIG. 6, the furnace structure of the furnace of the third embodiment of the present invention implements the refractory structure 50 having the spaces 52 as a reference inner surface, and as part of the surface in the longitudinal direction. Particularly, the curved fireproof layer 60 is formed.

As a result, such a structure basically realizes an increase in radiation area and gas residence time through the refractory structure 50, and at the same time, a surface curved refractory layer 60 is provided to partially implement vortex generation. will be.

In this case, it is possible to further increase the temperature by providing the surface curved refractory 60 to the refractory structure 50 at a necessary part, for example, a part where a temperature drop will occur.

As described above, according to the furnace structure of the heating furnace of which the present invention has improved thermal efficiency, by improving the furnace structure of the furnace, an effect of increasing the radiant area affecting the thermal characteristics to smoothly increase the temperature of the furnace is realized. to provide.

Therefore, the contact area of the gas moving along the furnace wall and the residence time thereof are increased to provide an excellent effect of further improving the thermal efficiency of the overall heating furnace.

While the invention has been shown and described in connection with specific embodiments so far, it will be appreciated that the invention can be varied and modified without departing from the spirit or scope of the invention as set forth in the claims below. It will be appreciated that those skilled in the art can easily know.

Claims (6)

In the furnace structure of the heating furnace, An outer shell member 10 provided outside the heating furnace; A fireproof layer 20 provided inside the shell member 10; And, A fireproof structure 50 provided inside the fireproof layer 20 and configured to increase the radiation area or the gas residence time; The furnace structure of the furnace configured to improve thermal efficiency, including. In the furnace structure of the heating furnace, An outer shell member 10 provided outside the heating furnace; A fireproof layer 20 provided inside the shell member 10; And, A surface curved refractory layer 60 provided inside the refractory layer 20 and configured to increase radiation area or gas residence time; The furnace structure of the furnace configured to improve thermal efficiency, including. In the furnace structure of the heating furnace, An outer shell member 10 provided outside the heating furnace; A fireproof layer 20 provided inside the shell member 10; A fireproof structure 50 provided inside the fireproof layer 20 and configured to increase the radiation area or the gas residence time; And, A surface curved refractory layer (60) provided at at least a portion of the refractory structure (50) and configured to increase radiation area or gas residence time in cooperation with the refractory structure; The furnace structure of the furnace configured to improve thermal efficiency, including. The heating according to any one of claims 1 to 3, characterized in that the fire resistant layer (20) comprises at least two layers of the fire brick (30) or the fire brick (30) and the castable layer (40). Roche structure of the furnace. According to claim 2 or 3, wherein the curved surface refractory layer 60 is attached to the refractory layer 20 or the refractory structure 50, the surface 62 is curved to increase the radiation area and gas A furnace structure of a heating furnace, characterized by comprising a castable molding layer which increases the contact residence time or generates gas vortices to smooth the furnace temperature. According to claim 1 or 3, wherein the refractory structure 50, the unit cells are formed in the form of a plurality of unit cells in which the space 52 is formed at the inner side in multiple polygons to increase the radiation area and gas retention in the space or A furnace structure of a furnace, characterized in that it is configured to generate vortices.

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