KR101052556B1 - Thermal barrier curtains in the furnace - Google Patents

Abstract

The present invention relates to a thermal barrier curtain of a furnace for minimizing the release of heat inside the furnace through the space where the heat-treated material that needs heat treatment for post-processing such as processing or tissue change is extracted.

The heat shield curtain of the heating furnace according to an embodiment of the present invention includes a mounting portion detachably mounted to the lift door of the heating furnace; And a heat shield coupled to the mounting portion to block heat emitted through an opening of a heating furnace when the lift door is opened, wherein the heat shield is formed of a plurality of pores and has a thermal insulation structure. It may be configured to include a thermal barrier mat made of yarn.

By the above configuration, the present invention can suppress the heat of the inside of the heating furnace to the outside through the charging opening which is opened for charging or extracting the material to be heated in the heating furnace, the heat transfer of the thermal barrier curtain itself Can be restrained as much as possible to ensure heat-resistant curtain durability against heat, reducing costs and delays in operation.

Heating furnace, heat shield, curtain, heat shield mat, heat resistant member, protective member

Description

Heat Resistant Curtain for Furnace {HEAT SHIELD CURTAIN FOR FURNACE}

The present invention relates to a thermal barrier curtain of a furnace for minimizing the release of heat inside the furnace through the space where the heat-treated material that needs heat treatment for post-processing such as processing or tissue change is extracted.

In general, a heating furnace is used in various processes to deform a structure such as a phase change of a material to be heated, such as a metal, or to facilitate processing of the material to be heated. For example, in steel and steel mills, heating furnaces are used for hot rolling of heated materials such as slabs, blobs, billets, steel pipes, and H-beams.

In this case, as shown in FIG. 1, in order to process (for example, rolling) a to-be-heated material, it is used in order to heat a to-be-heated material to high temperature appropriate temperature (1200-1300 degreeC).

In the conventional heating furnace 1, a charging inlet 4 is formed to allow the inflow and extraction of the material to be heated at one side, and the charging opening 4 is provided with a lift door to block heat from being discharged. (3) is installed.

When charging or extracting the material to be heated 9 by such a configuration, the lift door 3 provided in the charging port 4 is opened, and the material to be heated 9 passes through the charging port 4. In this case, charging or extraction of the heated material 9 is introduced by a device such as a walking beam (not shown) provided in the heating furnace 1 after raising the lift door 3 as described above. Or to be extracted.

By this process, charging or extracting of the material to be heated 9 is performed. For charging or extracting the material to be heated 9, the lift door 3 is moved to open the charging opening 4. You must do it.

In this case, there arises a problem that the internal heat of the heating furnace 1 is released to the outside through the open space of the lift door 3 by the movement (rising) of the lift door 3. On the other hand, even when the material to be heated 9 is positioned at the charging hole 4 in the process of charging or extracting, the open space of the charging hole 4 is inevitably larger than the size of the heating material 9 to be heated. The internal heat of the furnace 1 is released to the outside.

In this case, since a considerable heat loss occurs due to heat dissipation inside the furnace 1, the temperature inside the furnace 1 is lowered, and the lift door 3 moves (falls) to the charging hole 4. Even if is closed, in order to maintain the temperature for heating the material to be heated 9 sufficiently, a certain time for increasing the internal temperature of the heating furnace 1 is required. On the other hand, the waiting time for raising the internal temperature of the heating furnace 1 to allow sufficient heating of the material to be heated 9 causes a delay in working time.

Therefore, an additional heating operation for raising the temperature inside the furnace 1 for a predetermined time causes unnecessary combustion, which increases the amount of fuel used in the furnace 1, thus causing a cost increase.

The present invention is made by recognizing at least one of the needs or problems occurring in the conventional heating furnace as described above.

An object of the present invention is to provide a thermal barrier curtain to the lift door to maximize the heat from the inside of the furnace to the outside through a charging opening that is opened for charging or extracting the material to be heated in the furnace. will be.

Another object of the present invention is to allow the heat shield curtain is provided to block the opening to the outside from the outside so that the heat transfer of itself.

Still another object of the present invention is to suppress heat transfer of the thermal barrier curtain itself so that durability can be maintained.

Still another object of the present invention is to minimize heat loss emitted to the outside by suppressing heat transfer of the thermal barrier curtain itself.

A heat shield curtain of a heating furnace according to an embodiment for realizing at least one of the above problems may include the following features.

The present invention is based on the fact that the thermal insulation mat can be made by using a thermal barrier mat having a plurality of pores formed by using metal fiber yarn.

The heat shield curtain of the heating furnace according to an embodiment of the present invention includes a mounting portion detachably mounted to the lift door of the heating furnace; A train end coupled to the mounting portion to block heat emitted through the charging inlet of the heating furnace when the lift door is opened, the train end being configured to include a plurality of pores in which a train made of metal fiber yarns having an insulating structure It is configured to include a mat, the mounting portion is provided with a fixing member coupled to the heat shield, the fixing member is provided with at least two coupling members, the lift door is a mounting groove is formed so that the coupling member of the mounting portion is detachably coupled Being bracket, or characterized in that the locking member is provided.

On the other hand, the thermal barrier mat may be made of a woven or knitted structure of metal fiber yarn woven or braided. On the other hand, the thermal barrier mat may be configured to further include a coating layer made of a ceramic-based material. In this case, the coating layer may be formed by thermal spray coating.

And, the heat shield may be further provided with an auxiliary heat shield mat, so as to reduce the degree to which the internal heat of the furnace is transferred to the heat shield mat. In this case, the auxiliary thermal barrier mat may be configured to be coupled to the mounting portion and disposed on one side of the thermal barrier mat in the charging side. On the other hand, the auxiliary heat shield mat may be configured to include a coating layer made of a ceramic-based material in the member made of a heat resistant metal wire mesh structure. In this case, the coating layer may be formed by thermal spray coating.

In addition, the heat shield may be further provided with a protective mat so as to prevent damage to the heat shield mat by the charging of the material to be heated. In this case, the protection mat may be configured to be coupled to the mounting portion and disposed on one side of the thermal barrier mat in the charging side direction of the material to be heated. On the other hand, the protective mat may be configured to include a member made of a wear-resistant metal wire mesh structure.

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On the other hand, the mounting portion may further be provided with a cooling tube formed with a cooling flow path to prevent the area coupled with the lift door from being deformed or damaged by heat.

The metal fiber yarn constituting the thermal barrier mat is made of an iron-chromium-alunium alloy composed of 70 to 83% by weight of iron, 18 to 27% by weight of chromium, 3 to 7% by weight of aluminum, and 0.05 to 0.5% by weight of zirconium. It may be.

As described above, according to the present invention, by providing a thermal barrier curtain to the lift door to prevent the heat of the inside of the furnace to be discharged to the outside through the charging opening which is opened for charging or extracting the material to be heated to the furnace. Can be.

In addition, according to the present invention, it is possible to suppress the heat transfer of the thermal barrier curtain itself provided to block the opening to the outside to the outside, it is possible to ensure the durability of the thermal barrier curtain against heat.

In addition, according to the present invention, it is possible to further minimize heat loss emitted to the outside by suppressing heat transfer of the thermal barrier curtain itself.

In addition, according to the present invention, when the heat loss occurs in the furnace, the amount of gas, etc., which is used fuel for additional heating in the furnace may be reduced, thereby reducing costs.

In addition, according to the present invention, it is possible to reduce the waiting time for sufficient heating inside the heating furnace and to reduce the delay of the work.

In order to help the understanding of the features of the present invention as described above, it will be described in more detail with respect to the thermal barrier curtain of the heating furnace according to the embodiment of the present invention.

Hereinafter, exemplary embodiments will be described based on embodiments best suited for understanding the technical characteristics of the present invention, and the technical features of the present invention are not limited by the illustrated embodiments, It is to be understood that the present invention may be implemented as illustrated embodiments. Accordingly, the present invention may be modified in various ways within the technical scope of the present invention through the embodiments described below, and such modified embodiments fall within the technical scope of the present invention. In order to facilitate understanding of the embodiments to be described below, in the reference numerals shown in the accompanying drawings, among the constituent elements which perform the same function in each embodiment, the related constituent elements are indicated by the same or an extension line number.

Embodiments related to the present invention are based on the fact that the thermal insulation structure can be made by providing a thermal barrier mat having a plurality of pores formed using metal fiber yarns.

Referring to Figure 2 describes the heat shield curtain of the heating furnace according to an embodiment of the present invention, the heat shield curtain 100 may be configured to be mounted to the lift door (3) constituting the heating furnace (1). .

In this case, as shown in FIG. 2A, when the lift door 3 is moved (ascended) and the charge opening 4 is opened, the charge opening 4 is blocked by the thermal barrier curtain 100. (Closed), it is possible to minimize the discharge of the internal heat of the heating furnace (1) through the charging opening (4).

In this state, as shown in (b) of FIG. 2, when the material to be heated 9 is charged into the heating furnace 1 through the charging hole 4, by the thermal barrier curtain 100. The thermal barrier curtain 100 may be configured to allow the material to be heated 9 to pass through the charging hole 4 in a state where the charging hole 4 is opened.

As shown, the heat shield curtain 100 may be mounted to the lift door 3, as will be described below, the heat shield 110 and the train to block the opening 4 is opened. It may be configured to include a mounting portion 120 so that the end 110 can be mounted to the lift door (3).

On the other hand, the heating furnace (1) may be configured such that charging and extraction of the material to be heated (9) through the charging hole (4) as in the configuration of a general heating furnace.

As an example of the configuration of one embodiment, as shown in Figures 3 and 4, the heat shield curtain 100 is provided with a mounting portion 120 at one end of the heat shield 110, when opening the lift door (3) It can be comprised so that it may be arrange | positioned in the position which can block the charging opening 4. In this case, the lift door 3 may be provided with a bracket 130 to which the mounting part 120 is coupled, and the mounting part 120 may be detachable to the lift door 3.

In more detail, the heat shield 110 may be configured to have flexibility. Due to this configuration, the space (moving passage) in which the heat inside the heating furnace 1 is discharged while the heat-blocking part 110 is in close contact with the material to be heated 9 when charging or extracting the material to be heated 9 is provided. It can suppress the occurrence as much as possible.

As shown, the mounting portion 120 may include a fixing member 121 and a coupling member 122 so that the heat shield 110 may be suspended from the lift door 3. In this configuration, the heat shield 110 has one end fixed by the fixing member 121, and the coupling member 122 is coupled to the bracket 130 mounted on the lift door 3, thereby preventing the heat shield ( 110 may be configured to hang on the lift door (3).

In this case, the bracket 130 may be configured such that the mounting groove 132 into which the coupling member 122 is fitted is formed in the body 131 so that the coupling member 122 is detachably coupled.

As an example of such a configuration, the coupling member 122 may be configured to be in a hanging state in a state of being fitted into the mounting groove 132, so that the mounting unit 120 may be suspended from the bracket 130.

For example, the coupling member 122 has a top portion formed in a 'T' shape, and the bracket 130 is mounted in a longitudinal direction on a body 131 having a cross section having a 'U' shaped structure. The groove 132 may be formed to extend from one side of the body 131 to the bottom. In this case, the coupling member 122 may be mounted to the mounting groove 132 in the lateral direction of the body 131 to be suspended in the lower position of the body 131.

Meanwhile, a fixing member 135 serving as a stopper may be further disposed to prevent the coupling member 122 from being separated from the region of the mounting groove 132 disposed in the lateral direction of the body 131. In this case, the fixing member 135 may have a structure that can be filled in the empty space so that the coupling member 122 inserted into the mounting groove 132 does not move.

On the other hand, the body 131 of the bracket 130 may be further provided with at least one rib 133 for structural reinforcement. In addition, the bracket 130 may have the body 131 itself mounted on the lift door 3, and as shown, a separate mounting plate 134 is provided on the bracket body 131 to lift the door ( 3) may be mounted.

In addition, the heat shield 110 may be coupled to the fixing member 121 to be fixed by a bolt, a screw, or a generally known clamping means.

The heat shield 110 may be configured to include a heat shield mat 111 in order to maximize the suppression of the heat inside the heating furnace 1 to the outside.

The thermal barrier mat 111 may be composed of a metal fiber yarn 10 as shown in FIG. The metal fiber yarn 10 may be made by collecting or twisting a plurality of metal fibers (11).

In this case, the metal fiber 11 may be manufactured using a melt extraction method using a metal as a base material. For example, the base material may be made of an iron-chromium-based alloy. In this case, the base metal may be an alloy of 18 to 27% by weight, 3 to 7% by weight of aluminum, 0.05 to 0.5% by weight of zirconium, and balance iron (about 70 to 83% by weight).

In addition, the base material may use a metal circular rod having a diameter of about 10 -20mm, in this case, the base material is located near the melting means, the base material is melted while melting the end of the base material by heating to about 1,600 ℃ The metal fiber 11 may be made by contacting an end portion of the disk with a disk rotating at a high speed of about 20-100 sec. Through this process, the metal fiber 11 having a diameter of about 20 to 70 μm and a length of about 10 to 18 cm may be manufactured.

The metal fibers 11 manufactured as described above may be randomly arranged in a non-directional manner and may have a half moon-shaped cross section. As such, when the metal fibers 11 are randomly distributed, the metal fibers 10 may be manufactured by continuously combing to give one direction. The metal fiber yarn 10 manufactured as described above may be manufactured with a length of 0.45-0.6 m per 1 g, and in this case, the twist rate may be given as about 1-9 turn / m.

The heat shield mat 111 of the fabric structure or knitted structure may be configured by weaving or braiding the metal fiber 10 manufactured as described above.

For example, in the case of weaving, as shown in FIGS. 6A and 6B, the metal fiber yarn 10 may be made of a fabric 111a having a structure in which the warp yarn 10a and the weft yarn 10b are arranged perpendicular to each other. have. In this case, the fabric 111a may have a density of about 1.0-4.0 kg / m 2 and a thickness of about 0.5-2.5 mm. On the other hand, the fabric 111a may be formed on both sides of the fabric 111a salt holes having a length-to-length ratio of 5: 1.

In the example shown, the fabric 111a is woven so that the metal fiber yarn 10 of about 80 strands of the metal fiber 10a is about 14 per inch (ie, 5.5 / cm), The working rate of the fabric 111a was 8.5%.

As another example, in the case of braiding, as shown in FIG. 7, the metal fiber yarn 10 may be woven and made of a knitted fabric 111b. In this case, braiding can be made of a generally known knit structure.

As described above, when the thermal barrier mat 111 is made of a woven or braided metal fiber yarn 10 to be formed of a woven fabric 111a or a knitted fabric 111b, a plurality of pores are formed inside due to structural characteristics of the woven fabric or knitted fabric. This can be formed.

Through such a configuration, the heat shield mat 111 is disposed in the charging opening 4 as a curtain to block heat transmitted by radiation and convection from the inside of the heating furnace 1 by itself. Then, through the plurality of pores formed by the fabric or knit structure, it is possible to reduce the thermal conduction efficiency of the thermal barrier mat 111 itself.

In other words, the thermal barrier mat 111 is formed through a plurality of pores formed by the structural characteristics to reduce the heat conduction efficiency is formed to be able to suppress the heat of the interior to the outside as possible.

On the other hand, the thermal barrier mat 111 may be further formed with a coating layer made of a ceramic-based material. In this case, the coating layer may be formed by a spray coating method.

The thermal barrier mat 111 may be configured to be arranged in at least one or more layers. When the heat shield mat 111 is disposed in two or more layers, an insulation structure may be further formed by a space between the heat shield mats 111. In this case, the thermal barrier mat 111 may be made of only the fabric (111a), or may be made only of the knitted fabric (111b), or may be made of a mixture of the fabric (111a) and the knitted fabric (111b).

On the other hand, the heat shield 110 is arranged in the direction of the charging hole 4 so as to reduce the extent to which the heat inside the heating furnace 1 is transmitted to the heat shield mat 111 together with the heat shield mat 111. It may further include an auxiliary heat shield mat 113. The auxiliary heat shield mat 113 may serve to auxiliaryly block radiant heat and convective heat transmitted to the heat shield mat 111.

The auxiliary heat shield mat 113 may be configured to be coupled to the mounting unit 120 together with the heat shield mat 111. The auxiliary heat shield mat 113 may be formed of a member having a heat resistant metal wire mesh structure. In this case, the auxiliary thermal barrier mat 113 may be further formed with a coating layer made of a ceramic material on the heat-resistant metal wire mesh member. In this case, the coating layer may be formed by a spray coating method.

On the other hand, the heat shield 110 is further provided with a protective mat 112, so as to prevent the heat shield mat 111 is in direct contact with the material to be heated 9 together with the heat shield mat (111). May be When the material to be heated 9 is charged, the protection mat 112 may come into contact with the material to be heated 9 to prevent the heat-transfer mat 111 from being damaged.

The protection mat 112 may be configured to be coupled to the mounting part 120 together with the thermal barrier mat 111. In this case, the protection mat 112 may be disposed on one side of the heat shield mat 111 in the charging side direction of the material to be heated 9.

In addition, the protection mat 112 may be formed of a member made of a wear-resistant metal wire mesh structure. In this case, the protection mat 112 may be made such that its surface can minimize the friction with the material to be heated 9.

Thus, when the thermal insulation curtain 100 is provided in the charging opening 4 side of the heating furnace 1, the heating furnace 1 even when the lift door 3 is opened for charging and extracting the material to be heated. The temperature around the charging hole 4 of the is significantly reduced.

As a result of the actual simulation, the ambient temperature of the charging inlet 4 of the heating furnace before installation of the thermal barrier curtain 100 was about 500 degrees, but the ambient temperature of the charging inlet 4 of the heating furnace after the installation of the thermal barrier curtain 100 was It was confirmed that the temperature was lowered by about 400 degrees to about 100 degrees, and the heat loss in the furnace 1 was reduced.

The configuration of another embodiment of the thermal barrier curtain 100 will be described with reference to FIGS. 8 and 9. In this case, the same configuration as the above-described embodiment will be omitted for convenience of understanding.

The heat shield curtain 100 may be configured to be disposed at a position capable of blocking the charging opening 4 when the lift door 3 is provided with a mounting portion 120 at one end of the heat shield 110.

In this case, the lift door 3 is provided with a hanger member (not shown) having a structure such as a ring into which the mounting unit 120 is fitted or hooked so that the mounting unit 120 is detachable from the lift door 3. It may be configured.

Even in this case, the heat shield 110 is heated as the heat shield 110 is in close contact with the material to be heated 9 when charging or extracting the material to be heated 9, as in the above-described embodiment. 1) It can be configured to have flexibility so as to suppress the generation of the space (moving passage) inside which heat is released.

On the other hand, the heat shield 110 may be configured to include a heat shield mat 111 as described in the embodiment, the auxiliary heat shield mat as described in the embodiment together with the heat shield mat 111. 113 may be further provided. On the other hand, the heat shield 110 may be further provided with a protection mat 112 as described in the embodiment together with the heat shield mat 111, the heat shield mat 111 and the auxiliary heat shield mat ( 113 and the protection mat 112 may be provided.

The mounting portion 120 may be configured to include a fixing member 121 and the coupling member 122 so that the heat shield 110 can be suspended from the lift door (3).

In this case, the coupling member 122 may be configured to be simply fitted to the hanger member provided in the lift door 3 by forming a hole as shown. In addition, the fixing member 121 may be configured such that the heat shield 110 may be fixedly fixed by bolts, screws, or generally known clamping means as in the above-described embodiment.

Meanwhile, the mounting unit 120 may further include a cooling tube 123 in which a cooling flow path 123a is formed. In this case, the cooling tube 123 may be configured to be disposed between the fixing member 121 and the coupling member 122, as shown in the illustrated example.

The temperature rise due to heat transmitted to the mounting unit 120 or directly transferred to the mounting unit 120 by the cooling pipe 123 may be suppressed. By such a structure, it is possible to prevent damage to the coupling means or the coupling member constituting the mounting portion 120.

The thermal barrier curtain of the furnace described above is not limited to the configuration of the above-described embodiments, but the embodiments may be selectively combined with all or part of the embodiments so that various modifications may be made. It may be configured.

1 is a cross-sectional view showing the configuration of a heating furnace provided for heating a material to be heated in the prior art.

2 is a cross-sectional view schematically showing the structure of a heating furnace for explaining the operation of the thermal barrier curtain of the heating furnace according to an embodiment of the present invention.

3 is a front view schematically showing the structure of the thermal barrier curtain according to an embodiment of the present invention.

4 is a perspective view schematically showing the structure of the thermal barrier curtain shown in FIG. 3.

5 is a perspective view schematically showing the structure of the metal fiber yarn constituting the thermal barrier mat of the thermal barrier curtain according to an embodiment of the present invention.

6A and 6B are views schematically showing the structure of a heat shield mat of a heat shield curtain according to an embodiment of the present invention woven from the metal fiber yarn shown in FIG. 5.

7 is a view schematically showing a structure of a heat shield mat of a heat shield curtain according to an embodiment of the present invention braided by metal fiber yarn shown in FIG.

8 is a front view schematically showing the structure of the thermal barrier curtain according to another embodiment of the present invention.

FIG. 9 is a perspective view schematically illustrating a structure of the thermal barrier curtain illustrated in FIG. 8.

* Description of the main parts of the drawings *

1 ... heating furnace 3 ... lift door

4 ... Charging hole 9 ... Heated material

10 ... metal fiber yarn 11 ... metal fiber

100 ... thermal barrier curtain 110 ... thermal barrier

111 ... thermal insulation mat 112 ... auxiliary thermal insulation mat

113 ... protective mat 120 ... mounting

121 ... fixing member 122 ... coupling member

123 ... cooling tube 130 ... bracket

131 ... Body 132 ... Mounting groove

133 ... ribs 134 ... mounting plate

135 ... fixing member

Claims (13)

A mounting portion detachably mounted to the lift door of the heating furnace; And a heat shield coupled to the mounting portion to block heat emitted through the charging opening of the heating furnace when the lift door is opened. The heat shield is configured to include a heat shield mat made of a metal fiber yarn so that a plurality of pores are formed to have an insulating structure, The mounting portion is provided with a fixing member coupled to the heat shield, the fixing member is provided with at least two coupling members, The lift door is a heat shield curtain of the heating furnace, characterized in that the bracket is provided with a mounting groove, or the engaging member is formed so that the coupling member of the mounting portion is detachably coupled. The heat shield curtain according to claim 1, wherein the thermal barrier mat is woven or braided by metal fiber yarns to form a woven or knitted structure. 3. The thermal barrier curtain according to claim 1 or 2, wherein the thermal barrier mat further comprises a coating layer made of a ceramic material. 4. The thermal barrier curtain according to claim 3, wherein the coating layer is formed by thermal spray coating. The auxiliary heat shield according to claim 1, wherein the heat shield is coupled to the mounting part and disposed on one side of the heat shield mat in a charging side so as to reduce the degree to which the internal heat of the furnace is transferred to the heat shield mat. Heat shield curtain of the furnace, characterized in that the mat is further provided. 6. The thermal barrier curtain according to claim 5, wherein the auxiliary thermal barrier mat includes a coating layer made of a ceramic material in a member made of a heat resistant metal wire mesh structure. 7. The thermal barrier curtain according to claim 6, wherein the coating layer is formed by thermal spray coating. The method of claim 1, wherein the heat shield is coupled to the mounting portion to prevent damage to the heat shield mat by the charging of the material to be heated to one side of the heat shield mat in the charging side of the material to be heated. Heat shield curtain of the heating furnace, characterized in that the protective mat is further provided. 9. The thermal barrier curtain of a heating furnace according to claim 8, wherein the protection mat comprises a member having a wear resistant metal wire mesh structure. delete delete The heat shield curtain of the heating furnace of claim 1, wherein the mounting unit further comprises a cooling tube having a cooling passage. The iron-chromium-alunium system of claim 1 or 2, wherein the metal fiber yarn is composed of 70 to 83% by weight of iron, 18 to 27% by weight of chromium, 3 to 7% by weight of aluminum, and 0.05 to 0.5% by weight of zirconium. Heat-cut curtain of the heating furnace, characterized in that the alloy.

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