KR20100005842A - Blower for melting furnace having cooling structure - Google Patents

Abstract

PURPOSE: A blower for melting a furnace having cooling structure is provided to keep stability of task by controlling the deformation and crack of part and path. CONSTITUTION: A blower for melting a furnace having cooling structure comprises a feed port(110), a blow pipe(120), a top connection pipe(150), a lower connection pipe(140), and a connection pipe(130). The feed port supplies the hot air. The blow pipe is detachably combined with one side of the furnace. The blow pipe supplies the air provided from the feed port. The top connection pipe, the lower connection pipe and the connection pipe are formed between the feed port and the blow pipe. The connection pipe has a coolant path which is positioned close to a connection part.

Description

BLOWER FOR MELTING FURNACE HAVING COOLING STRUCTURE}

The present invention relates to a blower for supplying hot hot air into the melting furnace for melting iron ore.

In general, a melting furnace (generally called a blast furnace) for dissolving iron ore using coal or the like as a raw material is configured to supply the air having a high temperature to the inside of the melting furnace so that the raw material is burned at a temperature required for melting. have.

Such a blower is provided with a supply means called a blower tube, the blower tube is usually composed of a connection pipe consisting of one or more pipes so that the blow pipe and the blow pipe is connected to the supply for supplying hot air. Usually these connectors consist of an upper connector, a lower connector and a bending connector in order to satisfy the conditions such as the angle and the position at which the blower tube is inserted into the blast furnace.

Since these upper and lower connectors and bending connectors are used as a connecting means for blowing air heated to about 1250 ° C into the blast furnace, they are applied to the blower pipe by the heat and pressure generated during the operation to enable long-term use. It is manufactured to have structural stability which can absorb the displacement by the shock of the axial direction and the lateral direction which extends. In addition, workability and maintainability have been improved and are easily manufactured so as to be detachable so that air loss does not occur.

However, there is a problem in that the heat generating temperature of some areas is high in the connection pipe connecting the supply part and the blow pipe. In the case where such a local temperature difference occurs, a difference in durability due to a difference in thermal expansion and / or shrinkage may be locally observed, in which case, a crack and / or an inside of a connection pipe are caused by the high temperature and high pressure air flowing therein. There is a problem that the flow path is deformed or damaged.

In other words, in order to dissolve iron ore, it is necessary to maintain a certain temperature at all times. When cracks and / or flow paths are deformed in the connecting pipe supplying hot air, it is possible to supply an appropriate amount of air. There will be no. In addition, the crack generated due to the supply of high-pressure air causes breakage of the blower pipe, thereby causing damage to the equipment and / or safety accidents.

In addition, frequent operation breaks caused by damage and / or breakage of the connection pipe due to the temperature difference and replacement of the blower pipe are causing a decrease in productivity.

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

One object of the present invention is to provide a thermal stability of the connection pipe connecting the supply pipe for supplying hot air and the blow pipe inserted into the melting furnace.

Yet another object of the present invention is to prevent cracking of parts and / or deformation of a flow path due to thermal expansion and / or contraction generated in a connection tube by hot air supplied to a melting furnace.

Another object of the present invention is to suppress the deformation of the flow path caused by the temperature difference to enable the supply of the required amount of air.

Yet another object of the present invention is to prevent heat from being deteriorated by preventing heat from being discharged from the inside of the connection pipe to the outside.

Another object of the present invention is to provide a thermal stability of the connector to suppress the life of the product is shortened, to prevent the safety accident.

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

The present invention is basically configured to reduce the temperature difference locally generated in the connection pipe by the air flowing inside the connection pipe disposed between the supply portion for supplying hot air and the blow pipe mounted in the melting furnace. Based.

Melting furnace blower according to an embodiment of the present invention and the supply unit for supplying hot air; A blower pipe detachably coupled to one side of the melting furnace and supplying air supplied from the supply unit into the melting furnace; Containing an upper connection pipe, a lower connection pipe and a bending connection pipe disposed between the supply portion and the blow pipe, the connection pipe is provided with a cooling passage in the area adjacent to one or more coupling portion or coupling portion of each connection pipe; It may be configured.

On the other hand, the upper connection pipe may be provided with a cooling passage, respectively, the coupling portion coupled to the supply portion and the coupling portion coupled to the lower connection pipe, in this case, each cooling oil passage provided in the coupling portion with the supply portion and the lower connection tube It may be configured to be connected to each other by a connection flow path.

On the other hand, the upper connection pipe may be further provided with a detection unit connected to the inner flow path for the hot air flow, in this case, connected to the cooling passage provided in any one coupling portion in the region provided with the detection unit or the region adjacent to the detection unit Cooling flow path may be further provided.

On the other hand, the upper connection tube may be further provided with a detection unit connected to the inner flow path of the hot air flow, in this case, the area is provided with a coupling portion and the detection portion coupled to the coupling portion and the lower coupling tube Cooling flow paths may be provided at each of the cooling paths, and the cooling flow paths of the lower connection pipes and the cooling flow paths of the detection unit may be formed to be connected to each other, and may be configured to be connected to each other by the cooling flow paths and the connection flow paths provided in the coupling part coupled to the supply part. have.

In addition, the lower connection pipe may be provided with a cooling passage, respectively, the coupling portion coupled to the upper connection tube and the coupling portion coupled to the bending connector, in this case, the coupling portion between the upper connection tube and the bending connector is provided. Each cooling passage may be configured to be connected to each other by a connecting passage.

On the other hand, the upper connection pipe is provided with a cooling passage, respectively, the coupling portion coupled to the supply portion and the coupling portion coupled to the lower connection pipe, each of the cooling passages provided in the coupling portion with the supply portion and the lower connection tube each other by the connection passage It may be configured to be connected. In this case, the lower connection pipe may be provided with a cooling flow path, respectively, the coupling portion coupled to the upper connection tube and the coupling portion coupled to the bending connector, and each cooling provided in the coupling portion of the upper connection tube and the bending connector. The flow paths may be connected to each other by a connection flow path. In addition, the cooling passage provided in the upper connecting pipe and the cooling passage provided in the lower connecting pipe may be configured to be connected to each other.

The connecting flow path may be configured as a bendable connecting flow path. In addition, the connection flow path may be further provided with a guard (Guard) to be protected from external impact.

As described above, according to the present invention, the connection pipe disposed between the supply unit for supplying the hot air and the blow pipe inserted into the melting furnace can maintain a thermally stable state.

In addition, according to the present invention, thermal expansion and / or contraction generated in the connection pipe by the high temperature air flowing therein can be suppressed, thereby preventing cracking of the part and / or deformation of the flow path.

In addition, according to the present invention, it is possible to supply the required amount of air by suppressing the cracking of the parts and / or deformation of the flow path to maintain the stability of the work.

In addition, according to the present invention, it is possible to prevent the deterioration of components by preventing heat from being discharged to the outside from the inside of the connecting pipe to maintain the stability and / or safety of the device.

In addition, according to the present invention, the connector is to maintain a thermally stable state, it is possible to suppress the life of the product is shortened, and to prevent a safety accident.

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 blower for the furnace related to the embodiment of the present invention.

Hereinafter, the described embodiments will be described based on the embodiments best suited for understanding the technical features of the present invention, and the technical features of the present invention are not limited by the described embodiments. It is intended to illustrate that the invention can be implemented as described 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. And, hereinafter, in the reference numerals described in the accompanying drawings to help understand the embodiments described, the related components among the components that will have the same function in each embodiment are denoted by the same or extension number.

Embodiments related to the present invention basically reduce the temperature difference generated locally in the connection pipe by the air flowing inside the connection pipe disposed between the supply part for supplying the hot air and the blow pipe mounted in the melting furnace. Based on what is configured.

Referring to Figure 1, the blower 100 according to an embodiment of the present invention, the blower 100 is the inside of the supply unit 110 and the melting furnace 10 for supplying air of high temperature or high temperature high pressure ( It is configured to include a brow pipe 120 is detachably mounted so that one end is inserted into 10a) and a connection pipe connecting the supply unit 110 and the blown pipe 120. In this case, the connecting pipe is a lower connecting pipe 140 and the lower connecting pipe 140 is coupled to extend to the bending connector 130 and the bending connector 130 directly connected to the blow pipe 120 and It may be configured to include an upper connection pipe 150 directly connected to the supply unit 110. The connection pipe may be configured to be fixed to the melting furnace 10 by the support 160 so that the blow pipe 120 may be mounted on the melting furnace 10.

In the connection tube that can be configured as described above, a heat generation shape of a relatively high temperature occurs in each connection region and a region in which the measuring means provided in the connection tube is coupled. The reason for this is that there is no region made of refractory material or an area where the region made of refractory does not exist in the coupling portion of each connector and the region for measuring means.

For example, an area A in which the supply unit 110 and the upper connector 150 are coupled, an area B in which the upper connector 150 and the lower connector 140 are coupled, and a howe connector ( Reinforcement made of a refractory includes an area C to which the bending connector 130 is connected 140 and an area D to which the detection unit 159 for measuring a high temperature air flow rate flowing through the internal flow path of the connection pipe are mounted. It corresponds to a region where no addition is continuous or does not exist, and this region corresponds to a region where heat is generated at an abnormal temperature.

That is, the regions that generate heat at the abnormal temperature are regions where a bonding region exists, and a member (eg, a gasket) for sealing is present between the supply portion and the connection pipe, the connection pipe and the blow pipe, and the connection pipes. It is also present in the area provided with the detection means. These areas are transferred from the hot air flowing through the inner flow path to the outside, and the heat released to the outside causes thermal deformation (expansion and / or contraction) of the connection pipe.

Therefore, in order to suppress the heat generation at the abnormal temperature in this way, a cooling passage may be provided in the coupling portion of the connecting pipe to suppress abnormal heat generation, or a cooling passage may be provided in the region adjacent to the coupling portion to prevent abnormal heat generation. It can also be configured to suppress. In this case, when any one of the connection pipes is provided with a means for measurement, a cooling flow path may be provided in the region or the adjacent region where the measurement means is provided so as to suppress abnormal heat generation.

As such, as an example for suppressing heat generation of an abnormal temperature generated in the connection pipe, as shown in FIGS. 2A to 2C, the upper connection pipe 150 includes a coupling part 153 coupled to the supply part 110 and Cooling passages 155 and 156 may be formed in the coupling part 154 connected to the lower connection pipe 140, respectively. In this case, the upper connection pipe 150 is configured such that a flow path through which high-temperature and / or high-temperature high-pressure air flows may be formed therein, and may withstand heat transmitted from high-temperature air, and also transmit heat to the outside. The reinforcement parts 151a and 152a including heat and refractory materials are provided in order not to be prevented. In general, in the case where the pipes are formed for the flow of fluid, the sealing member such as a gasket is mounted to seal the coupling portion. In this case, the reinforcement parts 151a and 152a cannot be disposed in an area where the sealing member is mounted for sealing, and heat is transferred to the outside through the area where the reinforcement parts 151a and 152a are not disposed. Heat may be transferred through the body 150 of the tube.

For example, as shown in FIG. 1, the “A” and “B” regions to which the respective coupling parts 153 and 154 of the upper connector 150 are coupled, transfer heat therein, and thus the upper connector 150. A relatively high heat is generated compared to other regions of, so that the entire region of the upper connection pipe 150 may be cracked and / or deformed due to locally different thermal expansion and / or contraction.

Accordingly, the cooling passages 155 and 156 may be provided in the coupling parts 153 and 154 themselves and / or adjacent regions. In this case, the cooling passages 155 and 156 may be arranged in a ring shape along the circumference of each coupling portion 153 and 154, and the cooling passages 155 and 156 may be configured to be able to independently enter and discharge the cooling water. Alternatively, the cooling passages 155 and 156 provided in the coupling units 153 and 154 may be configured to be connected to each other by the connection passage 159. In this case, the inlet 156a may be formed in one cooling passage 156, and the outlet 155a may be formed in the other cooling passage 155.

On the other hand, the upper connection pipe 150 may be further provided with a detection unit 157 for measuring the flow rate and / or temperature of the air of the high temperature and / or high temperature and high pressure flowing along the inner flow path. In this case, since the detection unit 157 must be mounted to be connected to an internal flow path through which air of high temperature and / or high temperature and high pressure flows, in the “D” region where the detection unit 157 is provided, heat is transferred to the upper connection pipe ( The heat generated relatively higher than the other areas of 150, which causes the entire area of the upper connection pipe 150 to crack and / or deformation due to locally different thermal expansion and / or shrinkage.

Therefore, the cooling passage 158 may be further provided in the area where the detection unit 157 is mounted. In this case, the cooling passage 158 may be configured to be capable of introducing and discharging the cooling water so that the cooling passage 158 may be independently disposed in an area in which the detection unit 157 is mounted. On the other hand, as shown, the cooling passage 158 of the detection unit 157 may be configured to be connected to the cooling passage 156 provided in any one coupling portion 154. In this case, the cooling passage 158 of the detection unit 157 may be configured to be connected by the cooling passage 155 and the connection passage 159 provided in the other coupling portion 153.

As described above, the cooling passage 156 of the coupling unit 154 and the cooling passage 158 of the detection unit 157 are connected to each other, and the cooling passage 158 of the detection unit 157 is connected to the connection passage 159. When configured to be connected to the cooling passage 155 of the other coupling portion 153 by, the inlet 156a is provided in the cooling passage 156 of one coupling portion 154, the other coupling portion 153 The discharge passage 155a may be provided in the cooling passage 155 of the c) to form a cooling structure formed of a single passage.

On the other hand, the upper connection pipe 150 may be provided with a buffer 170 to prevent damage and / or deformation of the coupling portion and / or the connection pipe from the impact force generated by the air flowing through the inner flow path. In this case, the upper connecting pipe 150 may be composed of a first upper connecting pipe 151 and a second upper connecting pipe 152 having reinforcement parts 151a and 152a therein, respectively. As shown in FIGS. 3A and 3B, as an example of the configuration of the reinforcement unit 170, the first upper connecting pipe 151 and the second upper connecting pipe 152 are sealed by the buffer member 171. The coupling is made to be fixed in the connected state. Such a coupling structure includes a support part 173 coupled to the first upper connector tube 151 and a second upper connector tube 152 through the intermediate member 172 disposed around the buffer member 171. 175 may be configured to be coupled to the intermediate member 172 by fasteners 174, respectively.

On the other hand, by the configuration of the buffer unit 170, heat is transferred through the space between the first upper connecting pipe 151 and the second upper connecting pipe 152 to generate a relatively high heat, This may result in cracks and / or deformation of the entire region of the upper connection tube 150 due to locally different thermal expansion and / or contraction. Therefore, the buffer unit 170 may be arranged to be adjacent to any one of the cooling passages 155 and 156 provided in the coupling units 153 and 154 to cool the heat transferred from the inside.

When the shock absorbing unit 170 is provided as described above, when the blower 100 is mounted on the melting furnace 10, the first upper connecting pipe 151 and the second upper connecting pipe 152 determine the mounting position. Can be flown for. In this configuration, the cooling passages 155 and 156 of the two coupling portions 153 and 154 are connected by the connection passage 159 or the cooling passage 155 of the coupling portion 153 and the cooling passage of the detection unit 157 ( When the 158 is connected, in order to prevent damage to the connection passage 159, the connection passage 159 may be configured to have a length capable of position deformation, and on the other hand, may be made of a material capable of bending according to the position deformation. have.

In this case, the connection passage 159 may be configured to include a region 159a and a bendable region 159b provided to maintain a fixed region. Meanwhile, in order to prevent the connection flow path 159 from being damaged due to an external impact in the process of generating or mounting flow for positioning the blower 100, any part or all of the connection flow path 159 The guard 180 may be further provided to surround the area.

Meanwhile, the cooling structure of the lower connection pipe 140 may be configured similarly to the cooling structure provided in the upper connection pipe 150. Therefore, the description of the same structure as the upper connecting pipe 150 will be omitted or briefly described.

As shown in FIGS. 4A to 4C, the lower connection pipe 140 is coupled to the coupling part 143 and the coupling part 144 coupled to the upper connection pipe 150 and the bending connector 130, respectively. Cooling passages 145 and 146 may be formed.

As shown in FIG. 1, the “B” and “C” regions to which the respective coupling parts 143 and 144 of the lower connector 140 are coupled, transfer heat therein to other regions of the lower connector 140. Compared to the heat generation, relatively high heat is generated, which causes the entire region of the lower connection pipe 140 to be cracked and / or deformed due to locally different thermal expansion and / or contraction.

Therefore, the cooling passages 145 and 146 may be provided in the respective coupling portions 143 and 144 and / or adjacent regions. In this case, the cooling passages 145 and 146 may be arranged in a ring shape along the circumference of each coupling portion 143 and 144, and each cooling passage 145 and 146 may be configured to be able to independently enter and discharge the cooling water. In this case, when the cooling passage 156 is provided in the coupling portion 154 of the upper connecting pipe 150 coupled with the lower connecting pipe 140, the lower connecting pipe coupled with the upper connecting pipe 150 ( The coupling part 143 of the 140 may not be provided with a cooling passage. On the contrary, when the cooling passage 145 is provided in the coupling portion 143 of the lower connecting pipe 140 coupled to the upper connecting pipe 150, the upper connecting pipe coupled to the lower connecting pipe 140 ( The cooling passage may not be provided at the coupling portion 154 of the 150.

On the other hand, the cooling passages 145 and 146 provided in the respective coupling parts 143 and 144 of the lower connection pipe 140 may be configured to be connected to each other by the connection passage 149. In this case, the inlet 146a may be formed in one cooling channel 146, and the outlet 145a may be formed in the other cooling channel 145.

And, as in the case of the upper connector 150, in the case of the lower connector 140, damage and / or deformation of the coupling portion and / or connector from the impact force generated by the air flowing through the inner flow path. In order to prevent the buffer 170 may be provided. In this case, the lower connecting pipe 140 may also be composed of a first lower connecting pipe 141 and a second lower connecting pipe 142 provided with reinforcing parts 141a and 142a therein.

In this case, the example of the configuration of the reinforcement unit 170 may be configured as already described in the above embodiment, so a detailed description thereof will be omitted. In the case of the lower connection pipe 140, the buffer unit 170 is disposed adjacent to one of the cooling passages 145 and 146 provided in each coupling unit 143 and 144 to cool the heat transferred from the inside. It can also be configured to be possible. In addition, in order to prevent damage to the connection passage 149, the connection passage 149 may be configured to have a length capable of position deformation, and on the other hand, may be made of a material capable of bending according to the position deformation.

In addition, the connection flow path 149 may be configured to include an area 149a and a bendable area 149b provided to maintain a fixed area, and any part of the connection flow path 149. Alternatively, the guard 180 may be further provided to surround the entire area.

As such, the connection pipe connecting the supply part 110 and the brow pipe 120 may be provided with a cooling structure. In this case, when the cooling passage 146 is formed in the coupling portion 144 of the lower connecting tube 140 to be coupled with the bending connector 130, the bending connector 130 and the lower connector 140 Since the abnormal heat generation phenomenon of the coupling region C can be suppressed, the bending connector 130 may not be provided with a separate cooling structure. Alternatively, a cooling passage having a structure as described above may be further formed at the coupling portion of the bending connector 130 that is coupled to the lower connector 140. This configuration can be made as in the case of the embodiment, a detailed description thereof will be omitted.

On the other hand, the cooling structure provided in the upper connection pipe 150 and the cooling structure provided in the lower connection pipe 140 may be configured to be connected to each other by a separate connection flow path (not shown). For example, the cooling flow path 156 of the upper connection pipe 150 and the cooling flow path 145 of the lower connection pipe provided in the area "B" are connected to each other using a connection flow path having the same structure as described in the above embodiment. It may be configured to be connected to each other so that the cooling structure of the entire upper connecting pipe 150 and the lower connecting pipe 140 may be configured integrally.

In this case, all or some of the cooling passages 155, 156, and 158 provided in the upper connection pipe 150 may be configured to be connected to each other as in the configuration of the above-described embodiment, and the angles provided in the lower connection pipe 140 The cooling passages 145 and 146 may be configured to be connected to each other.

The blower for the melting furnace described above is not limited to the configuration of the above-described embodiment, the embodiments may be configured by selectively combining all or part of each embodiment so that various modifications can be made. have.

1 is a cross-sectional view schematically showing the structure of a blower for a melting furnace according to an embodiment of the present invention.

FIG. 2A is a cross-sectional view schematically showing an example of one configuration of an upper connection pipe forming the blower illustrated in FIG. 1.

FIG. 2B is a right side view schematically showing an example of one configuration of the upper connecting tube shown in FIG. 2A.

FIG. 2C is a left side view schematically showing an example of one configuration of the upper connecting tube shown in FIG. 2A.

3A is a partial cross-sectional view showing an example of one configuration of the structure of the shock absorbing portion provided in the upper connecting pipe in more detail.

FIG. 3B is a partial cross-sectional view showing the buffer part shown in FIG. 3A at another angle. FIG.

FIG. 4A is a cross-sectional view schematically illustrating an example of a configuration of a lower connection pipe forming the blower illustrated in FIG. 1.

FIG. 4B is a right side view schematically showing an example of one configuration of the lower connector shown in FIG. 4A.

FIG. 4C is a left side view schematically showing an example of one configuration of the lower connector shown in FIG. 4A.

* Description of the main parts of the drawings *

100 ... blower 110 ... supply

120 ... blow pipe 130 ... bend connector

140 ... lower connector 141 ... first lower connector

142 ... second lower connector 143, 144, 153, 154 ... coupling

145,146,155,156,158 ... cooling passage

149,159 ... Euro 150 ... Upper connector

151 ... first upper connector 152 ... second upper connector

157 ... detector 160 ... support

170 ... buffer 180 ... guard

Claims (10)

A supply unit for supplying hot air; A blow pipe detachably coupled to one side of the melting furnace and supplying air supplied from the supply unit into the melting furnace; A connection pipe including an upper connection pipe, a lower connection pipe, and a bending connection pipe disposed between the supply part and the blow pipe, and having a cooling flow path provided in an area adjacent to one or more coupling parts or coupling parts of each connection pipe; Blowing apparatus for a furnace, characterized in that comprising a. According to claim 1, wherein the upper connection pipe is provided with a cooling flow path is provided in each of the coupling portion coupled to the supply portion and the lower connection tube, respectively, each cooling passage provided in the coupling portion with the supply portion and the lower connection tube The blower for the furnace, characterized in that configured to be connected to each other by a connecting flow path. The blower of claim 2, wherein the connection flow passage comprises a bendable connection flow passage. According to claim 2, wherein the upper connection pipe is further provided with a detection unit connected to the inner flow path for the hot air flow, and the cooling passage provided in any one coupling portion in the region provided with the detection unit or the region adjacent to the detection unit; Blowing apparatus for the furnace characterized in that the cooling passage is further provided. According to claim 1, wherein the upper connection pipe is further provided with a detection unit connected to the inner flow path flowing hot air, Cooling flow paths are provided in regions where the coupling part coupled to the supply part and the coupling part coupled to the lower connection pipe and the detection part are provided, respectively. Cooling flow path of the lower connection pipe and the cooling flow path of the detection unit is formed to be connected to each other blower for the melting furnace characterized in that configured to be connected by the cooling flow path and the connection flow path provided in the coupling portion coupled to the supply. According to claim 1, wherein the lower connecting pipe is provided with a cooling flow path is provided in each of the coupling portion and the coupling portion coupled to the upper coupling tube, the coupling portion between the upper connector and the bending connector, respectively. Blowing apparatus for the melting furnace, characterized in that each cooling passage is configured to be connected to each other by a connecting passage. The blower according to claim 6, wherein the connection flow passage comprises a bendable connection flow passage. The blower according to any one of claims 2, 3, 6 or 7, wherein the connection oil passage is further provided with a guard so as to be protected from an external impact. According to claim 1, wherein the upper connection pipe is provided with a cooling flow path is provided in each of the coupling portion coupled to the supply portion and the lower connection tube, respectively, each cooling passage provided in the coupling portion with the supply portion and the lower connection tube Are configured to be connected to each other by a connecting flow path, The lower connection pipe is provided with a cooling passage, respectively, a coupling portion coupled to the upper connection tube and a coupling portion coupled to the bending connector, and each cooling passage provided at the coupling portion between the upper connection tube and the bending connector is connected. Are connected to each other by a flow path, Cooling passage provided in the upper connection pipe and the cooling flow path provided in the lower connection pipe blower for the furnace characterized in that it is configured to be connected to each other. 10. The method of claim 9, wherein the upper connection pipe is further provided with a detection unit connected to the inner flow path of the hot air, the cooling passage is further provided in each of the area provided with the detection unit, the cooling passage of the detection unit is connected to the lower Melting blower for the furnace characterized in that configured to be connected to the cooling passage provided in the coupling portion of the upper connection pipe coupled with the pipe.

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