JP2015190034A - Drier for blast furnace large trough - Google Patents

Abstract

The present invention provides a drying apparatus for a blast furnace ridge capable of heating and drying an amorphous refractory constructed on a blast furnace ridge so that uneven temperature rise does not occur at a low temperature. A drying apparatus 100 according to the present invention is a drying apparatus 100 that dries an irregular refractory material applied to the inner surface of a large blast furnace 5 and is provided at the bottom of the large ridge 5 along the longitudinal direction of the large ridge 5. A fuel gas header 110 for supplying fuel gas, a combustion air header 120 for supplying combustion air from above the fuel gas header 110, and an amorphous refractory to be dried in the longitudinal direction of the large bowl 5 are installed. Partition plates 132 and 134 that divide the drying target area from other areas, an upper plate 140 that covers the upper side of the drying target area partitioned by the partition plates 132 and 134, a large bowl 5, the partition plates 132 and 134, and the upper plate 140. A chimney 150 that communicates the inside and the outside of the drying space formed by the above and discharges the exhaust gas generated inside the drying space to the outside. [Selection] Figure 1

Description

  The present invention relates to a drying apparatus for a blast furnace ridge that dries an irregular refractory applied to the inner surface of the blast furnace ridge.

  A large refractory that flows out from the blast furnace is covered with bricks and then an irregular refractory is applied to the surface. This amorphous refractory is called lining. In the lining, the core is inserted and placed in the vat, and an amorphous refractory is poured between them. After curing for an appropriate time, the core is released, and the working surface of the irregular refractory cured in the vat It is formed by heating with a gas burner from the (inner wall surface in contact with the hot metal) and drying.

  Here, in drying the amorphous refractory, heat is conducted to the inside of the amorphous refractory constructed by heating from the working surface side, and the contained moisture is vaporized. At this time, it is important to uniformly raise the temperature of the entire surface without locally raising the surface temperature of the amorphous refractory.

  For example, Patent Literature 1 discloses a drying apparatus for a blast furnace cast iron soot that is integrated by arranging burners appropriately on the top of the soot cover and drying them by complete combustion by compressed air or external suction. Such a drying apparatus dries the refractory from the surface and raises the temperature.

  In addition, for example, in Patent Document 2, even a refractory constructed in a long and slender shape like a spear can be sprinkled or explode by drying and raising the temperature uniformly with a heat pattern according to the characteristics of the refractory. A temperature rising slit-type burner device for preventing generation is disclosed.

Japanese Utility Model Publication No. 58-129499 Japanese Patent Laid-Open No. 2001-4110

  However, in Patent Document 1, since the refractory containing moisture is heated and dried from the surface, spalling and explosion are likely to occur when the refractory is rapidly heated to a high temperature.

  In Patent Document 2, the burner device includes a triple cylinder header and a slit nozzle, but the burner mixes and burns fuel gas and combustion air at the burner nozzle portion, so that the injected flame becomes high temperature, It is not suitable for forming a low temperature atmosphere for the purpose of drying. Further, since high-pressure fuel gas and combustion air are supplied to the slit burner, the fuel gas and combustion air are injected from the slit portion at high speed. For this reason, there is a possibility that the sprayed flame directly hits the bed surface and locally becomes hot, causing spalling and explosion. Moreover, the burner apparatus of patent document 2 also has problems, such as a swirl | wing blade and a slit nozzle, which are precise | minute and complicated, and expensive.

  Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to raise the temperature of an irregular refractory constructed in a blast furnace ridge so that uneven temperature rise does not occur at a low temperature. -To provide a drying device for a blast furnace ridge capable of drying.

  In order to solve the above problems, according to one aspect of the present invention, there is provided a drying apparatus for drying an amorphous refractory material applied to the inner surface of a blast furnace. Such a drying apparatus for a blast furnace ridge includes a fuel gas supply section for supplying fuel gas, and a combustion air supply section for supplying combustion air from above the fuel gas supply section, which are arranged at the bottom of the ridge along the longitudinal direction of the ridge. And a partition member that partitions the drying target area where the amorphous refractory to be dried is applied in the longitudinal direction of the large bowl from the other areas, an upper plate that covers the upper side of the drying target area partitioned by the partition member, and And a discharge portion that communicates the inside and outside of the drying space formed by the partition member and the upper plate and discharges the exhaust gas generated inside the drying space to the outside.

  You may arrange | position a combustion air supply part along the longitudinal direction of Oiso directly above a fuel gas supply part.

  In addition, the amount of fuel gas supplied from the fuel gas supply unit is adjusted so that the formed flame does not directly hit the inner surface of the large bowl.

  As described above, according to the present invention, it is possible to heat and dry the amorphous refractory applied to the blast furnace ridge so that uneven temperature rise does not occur at a low temperature.

It is a perspective view which shows the drying apparatus of the blast furnace ridge according to the 1st Embodiment of this invention. It is a fragmentary sectional side view which shows the drying apparatus of the blast furnace Oiso concerning the embodiment. It is a side view which shows the fuel gas header and combustion air header which concern on the same embodiment. It is sectional drawing in the AA cutting line of FIG. It is a partial cross section side view which shows the drying apparatus of the blast furnace ridge according to the 2nd Embodiment of this invention. It is a perspective view which shows one structural example of the conventional drying apparatus. It is a partial cross section side view which shows the conventional drying apparatus. It is sectional drawing in the BB cutting line of FIG. In an Example, it is a graph which shows the atmospheric temperature change until drying of an amorphous refractory is completed.

  Exemplary embodiments of the present invention will be described below in detail with reference to the accompanying drawings. In addition, in this specification and drawing, about the component which has the substantially same function structure, duplication description is abbreviate | omitted by attaching | subjecting the same code | symbol.

<1. First Embodiment>
[1-1. Configuration of drying device]
With reference to FIGS. 1-4, the structure of the drying apparatus 100 of the blast furnace ridge according to the 1st Embodiment of this invention is demonstrated. FIG. 1 is a perspective view showing a drying apparatus 100 for a blast furnace ridge according to this embodiment. FIG. 2 is a partial cross-sectional side view showing the drying apparatus 100 for a blast furnace ridge according to the present embodiment. FIG. 3 is a side view showing the fuel gas header 110 and the combustion air header 120 according to the present embodiment. 4 is a cross-sectional view taken along the line AA in FIG. In FIG. 1 and FIG. 2, the size of some constituent members is exaggerated for the sake of explanation.

  The drying apparatus 100 for a blast furnace Oiso according to this embodiment is an apparatus that is installed and used in the Otsuka 5 in order to dry the amorphous refractory after constructing the amorphous refractory that is a lining on the Otsuka 5. As shown in FIGS. 1 and 2, the drying apparatus 100 includes a fuel gas header 110, a combustion air header 120, two partition plates 132 and 134, an upper plate 140, a chimney 150, and an observation window 160. Consists of A space for drying the amorphous refractory (hereinafter also referred to as “drying space”) is formed by enclosing the amorphous refractory applied to the large bowl 5 with the partition plates 132 and 134 and the upper plate 140. The fuel gas header 110 and the combustion air header 120 constitute a drying burner that dries the amorphous refractory.

  The drying apparatus 100 according to this embodiment is provided with a drying burner in a drying space to form a uniform atmosphere at a low temperature (about 300 ° C.), and appropriately heat and dry the amorphous refractory. In addition, the ridge of the blast furnace 5 which uses the drying apparatus 100 generally has a width of about 1.0 m to 1.6 m and a depth of about 1.0 m.

(Fuel gas header)
The fuel gas header 110 is a fuel gas supply unit that supplies fuel gas to the drying space of the irregular refractory. As shown in FIGS. 1 and 2, the fuel gas header 110 extends in the longitudinal direction (y direction) near the bottom surface of the large bowl 5. In the present embodiment, the fuel gas header 110 is disposed as close as possible to the bottom surface of the large cage 5 so as to be dried from the bottom surface side of the large cage 5, and between the fuel gas header 110 and the bottom surface of the large cage 5. Fuel gas can be distributed. For example, as shown in FIG. 2, support members 102, 102 are provided on the bottom surface of the large bowl 5, and the fuel gas header 110 is placed thereon, so that the fuel gas header 110 can be stably installed near the bottom surface of the large bowl 5. can do.

  The fuel gas header 110 is a hollow member whose both ends in the longitudinal direction are closed, and a fuel gas pipe 114 through which fuel gas supplied from the outside flows into the fuel gas header 110 is communicated with one end side. A plurality of fuel gas injection holes 112 are formed in the circumferential surface of the fuel gas header 110 at predetermined intervals in the longitudinal direction. Thereby, fuel gas can be supplied uniformly over the whole longitudinal direction of dry space. More preferably, the fuel gas injection hole 112 is formed at a position facing each side surface so that the fuel gas is injected toward both side surfaces of the large bowl 5. For example, as shown in FIG. 4, the fuel gas injection hole 112 may be formed at a radial position orthogonal to the vertical direction (z direction) on the outer peripheral surface of the fuel gas header 110. The fuel gas supplied from the fuel gas header 110 does not include combustion air.

(Combustion air header)
The combustion air header 120 is a combustion air supply unit that supplies combustion air to the drying space of the irregular refractory. As shown in FIGS. 1 and 2, the combustion air header 120 extends in the longitudinal direction (y direction) just above the fuel gas header 110 in the same manner as the fuel gas header 110. In the case of such a configuration, the combustion air header 120 may be fixed to the fuel gas header 110 to have an integral structure.

  The combustion air header 120 is also a hollow member closed at both ends in the longitudinal direction, and a combustion air pipe 124 through which combustion air supplied from the outside flows into the combustion air header 120 is communicated with one end side. A plurality of combustion air injection holes 122 are formed in the circumferential surface of the combustion air header 120 at predetermined intervals in the longitudinal direction. More preferably, the combustion air injection hole 122 is formed at a position facing each side surface so that the combustion air is injected toward both side surfaces of the large bowl 5.

  For example, as shown in FIG. 4, the combustion air injection hole 122 may be formed at a radial position orthogonal to the vertical direction (z direction) on the outer peripheral surface of the combustion air header 120. Further, the combustion air injection hole 122 is formed at a position where the injected combustion air does not directly hit the flame so as not to disturb the flame formed by igniting the fuel gas injected from the fuel gas injection hole 112. It is better.

  The combustion air header 120 is configured to have substantially the same length as the fuel gas header 110. The formation interval (pitch) of the combustion air injection holes 122 in the longitudinal direction is preferably substantially the same as the fuel gas injection holes 112 of the fuel gas header 110 as shown in FIG. Combustion air can be appropriately supplied to the fuel gas injection position. Further, the combustion air header 120 may be formed by a pipe having a larger diameter than the fuel gas header 110. For example, the ratio of the diameters of the combustion air header 120 and the fuel gas header 110 can be about 3: 1. The combustion air supplied from the combustion air header 120 is set to an air ratio of about 2.

(Partition plate)
The partition plates 132 and 134 are plate-like partition members provided on the upstream side and the downstream side in the longitudinal direction of the large bowl 5 so as to sandwich the region where the irregular refractory is applied. The partition plates 132 and 134 close the longitudinal cross-sectional opening portion of the bowl 5 with the upstream side and the downstream side in the longitudinal direction. Thereby, about the longitudinal direction of the large bowl 5, the area | region where the amorphous refractory was constructed is interrupted | blocked from the exterior.

(Upper plate)
The upper plate 140 is a member that covers the upper side of the region where the amorphous refractory partitioned by the partition plates 132 and 134 is constructed. For example, as shown in FIG. 1, the upper plate 140 is provided across the upper surfaces of both ends in the width direction (x direction) of the large bowl 5. As the upper plate 140, it is preferable to use a lightweight plate member having heat resistance. In the present embodiment, a plate-like member configured by sandwiching a ceramic fiber blanket between two corrugated plates is used as the upper plate 140. The upper plate 140 having such a configuration is lightweight and can be easily laid on the large ridge 5. The shape of the upper plate 140 is not limited to this example, and may be a flat plate without waves, for example.

  In addition, temperature increase efficiency can be improved by making dry space into the space sealed as much as possible except the discharge part by the chimney 150. FIG. However, even if the drying space is not completely sealed, the effect of the drying apparatus 100 according to the present embodiment is not greatly affected. Therefore, when a corrugated plate is used as the upper plate 140 as in the present embodiment, there is no problem with the degree of gap that can be formed between the corrugated plate and the upper surfaces of both ends of the large bowl 5. Further, when a corrugated plate is used as the upper plate 140, as shown in FIG. It will not bend.

  Further, the upper plate 140 is formed with an opening for providing a chimney 150 and an observation window 160 described later. Furthermore, an opening for providing a fuel gas pipe 114 for supplying fuel gas to the fuel gas header 110 from the outside, a combustion air pipe 124 for supplying combustion air to the combustion air header 120 from the outside, and the like are further formed in the upper plate 140. May be.

(chimney)
The chimney 150 is a cylindrical member that discharges exhaust gas generated in the dry space due to combustion of the fuel gas to the outside of the dry space. The chimney 150 is provided substantially perpendicular to the upper plate 140, and communicates the inside and the outside of the drying space. The installation position of the upper plate 140 is not particularly limited. For example, the upper plate 140 may be provided near the central portion in the longitudinal direction of the drying space. The chimney 150 has such a length that the exhaust gas is discharged from the dry space, for example, about 2 m. In addition, the chimney 150 is preferably formed of a lightweight material so that it can be easily installed.

(Observation window)
The observation window 160 is provided in a part of the upper plate 140 in order to observe the flame state in the dry space. The observation window 160 is formed, for example, by opening a part of the upper plate 140 and providing a heat-resistant transparent member such as heat-resistant glass in the opening. Thereby, while being able to observe the flame state in dry space, the dry space can be maintained in the substantially sealed state.

[1-2. Installation method of drying equipment]
The drying apparatus 100 according to the present embodiment is installed and used in the large bowl 5 as follows. First, the fuel gas header 110 and the combustion air header 120 constituting the dry burner are installed on the bottom surface of the large bowl 5 in the region where the irregular refractory is applied to the large bowl 5. The fuel gas header 110 and the combustion air header 120 may be integrated in advance by adjusting the positions of the fuel gas injection holes 112 and the combustion air injection holes 122, for example.

  Support members 102, 102 are provided on the bottom surface of the bowl 5 so as to support both ends of the fuel gas header 110. Note that at least one support member 102 may be provided, and two or more support members 102 may be provided in order to stably support the fuel gas header 110. A fuel gas header 110 is placed on the support members 102, 102, and a combustion air header 120 is provided immediately above (in the vertical direction). At this time, the fuel gas injection hole 112 of the fuel gas header 110 and the combustion air injection hole 122 of the combustion air header 120 are opposed to the side surface of the large bowl 5.

  Next, partition plates 132 and 134 are installed in the large bowl 5 on the upstream side and the downstream side of the construction area of the irregular refractory in which the fuel gas header 110 and the combustion air header 120 are installed in the longitudinal direction of the large bowl 5. By the partition plates 132 and 134, the construction area of the amorphous refractory is separated from other areas.

  Thereafter, the fuel gas is supplied to the fuel gas header 110 and the combustion air is supplied to the combustion air header 120 from the outside, the fuel gas is injected from the fuel gas injection holes 112, and the combustion air is injected from the combustion air injection holes 122. Then, the fuel gas injected from the fuel gas injection hole 112 is ignited from the outside by an ignition torch (not shown). Oxygen necessary for the combustion of the fuel gas is ensured by the combustion air injected from the combustion air injection holes 122 around the flame. Since the injected combustion air is diffused and supplied to the portion where the fuel gas is injected, the formed flame becomes a soft flame of slow combustion. The flame is adjusted so as not to collide directly with the amorphous refractory to be dried by adjusting the supply amount of the fuel gas.

  For example, it is assumed that the fuel gas header 110 having a diameter of 80 mm extends in the longitudinal direction in the center of the width direction of the large punch 5 having a width of 1060 mm. The diameter of the fuel gas injection hole 112 of the fuel gas header 110 is 5 mm. At this time, the supply amount of the fuel gas is adjusted so that the flame of the fuel gas injection hole 112 does not directly hit the irregular refractory constructed on the side surface of the large bowl 5, and the injection speed of the fuel gas is about 8 to 22 m / Set during s. If the injection speed of the fuel gas is less than 8 m / s, the flame length becomes too short, and it is impossible to form an atmosphere temperature sufficient to dry the amorphous refractory. On the other hand, if the fuel gas injection speed is higher than 22 m / s, the flame length becomes long, and the flame directly hits the irregular refractory. In this way, the supply amount of the fuel gas is adjusted to form a flame that does not directly collide with the amorphous refractory.

  After confirming that a flame is appropriately formed in each fuel gas injection hole 112 of the fuel gas header 110, the operator covers the upper portion of the region where the amorphous refractory is applied with the upper plate 140. The upper plate 140 may be a single plate or may be configured by laying a plurality of plates. By installing the upper plate 140, a substantially sealed dry space is formed in the region where the amorphous refractory is applied. By forming such a dry space, the ambient temperature can be made uniform and the fuel gas can be used effectively. Thereafter, a chimney 150 for discharging exhaust gas generated by the combustion of the fuel gas is installed in the opening portion of the upper plate 140.

  By forming the drying space and drying the amorphous refractory with a soft flame, it is possible to form a low-temperature atmosphere temperature desirable for drying from the beginning of ignition. In addition, the drying apparatus 100 according to the present embodiment supplies the fuel gas over the entire length in the bottom side of the bowl 5 to uniformly dry the amorphous refractory applied to the bowl 5 from the bottom side. Can do. Therefore, the amorphous refractory can be rapidly heated to a high temperature to prevent spalling or explosion.

  The state inside the drying space when the drying space is formed and the amorphous refractory is being dried can be viewed from the observation window 160 formed in the upper plate 140. For example, the safety of combustion can be confirmed by visually confirming whether a flame is formed from the observation window 160. In the unlikely event of a misfire, the operator can close the shut-off valve installed in the fuel gas supply system to ensure safety. Alternatively, a flame monitoring device (not shown) may be installed outside the drying space, and the inside of the drying space may be observed from the observation window 160 by the flame monitoring device. In this case, the flame monitoring device may be configured to be able to control the shutoff valve so as to close the shutoff valve when a misfire is detected.

[1-3. Summary]
The configuration and function of the drying apparatus 100 according to the present embodiment have been described above. According to this embodiment, the fuel gas header 110 is provided in the vicinity of the bottom surface of the large bowl 5, the fuel gas is supplied at a predetermined interval in the longitudinal direction, and the combustion air is supplied from above the fuel gas header 110 from the combustion air header 120. . As a result, the fuel gas is necessary for combustion from the combustion air (that is, the secondary air) supplied to the dry space after being injected from the fuel gas injection hole 112 without using the primary air previously mixed with the fuel gas. Get all the oxygen and burn it. In this way, by forming a so-called red fire type combustion burner from the fuel gas header 110 and the combustion air header 120, a soft flame can be formed in the longitudinal direction of the fuel gas header 110.

  In addition, the partition plates 132 and 134 and the upper plate 140 form a substantially sealed drying space in the region where the amorphous refractory to be dried is applied, so that moisture is contained without inflow of cold outside air. A uniform low-temperature atmosphere suitable for drying an amorphous refractory can be formed. Thereby, the amorphous refractory material constructed in a long region in the longitudinal direction with respect to a long and slender member like a ridge can be uniformly dried without causing explosion or spalling. Further, the fuel gas can be effectively utilized by making the drying space almost sealed.

  Furthermore, by using the drying apparatus 100 according to the present embodiment, in addition to being able to efficiently dry the amorphous refractory, the apparatus configuration is also simple, and work on site can be easily performed. There is also an effect that the working time can be shortened.

<2. Second Embodiment>
Next, with reference to FIG. 5, the structure of the drying apparatus 200 of the blast furnace ridge according to the second embodiment of the present invention will be described. FIG. 5 is a partial cross-sectional side view showing a drying apparatus 200 for a blast furnace ridge according to this embodiment. In FIG. 5, the size of some constituent members is exaggerated for the sake of explanation.

  The drying apparatus 200 for the blast furnace ridge according to the present embodiment is used to dry the amorphous refractory after the refractory refractory that is the lining is applied to the ridge 5 similarly to the drying apparatus 100 according to the first embodiment. It is a device installed and used in Oiso 5. Compared with the drying apparatus 100 according to the first embodiment, the drying apparatus 200 is different in the method for supplying combustion air to the drying space and the exhaust gas discharge position. Below, this difference is mainly demonstrated about the structure of the drying apparatus 200, and its function, and detailed description is abbreviate | omitted about the component which has the same structure and function.

  As shown in FIG. 5, the drying apparatus 200 according to the present embodiment includes a fuel gas header 110, two partition plates 132 and 134, an upper plate 140, a chimney 150, and an observation window 160. . As in the first embodiment, by enclosing the amorphous refractory applied to the large bowl 5 with the partition plates 132 and 134 and the upper plate 140, a drying space for drying the amorphous refractory is formed. On the other hand, in this embodiment, the drying burner which dries an amorphous refractory is comprised from the fuel gas header 110 and the combustion air piping 124 which supplies combustion air to the drying space from the outside.

  The fuel gas header 110 extends in the longitudinal direction (y direction) in the vicinity of the bottom surface of the large bowl 5. As in the first embodiment, the fuel gas header 110 is placed, for example, on the support members 102 and 102 installed on the bottom surface of the large bowl 5 so as to be as close to the bottom surface of the large bowl 5 as possible. The formation positions and sizes of the fuel gas injection holes 112 formed at predetermined intervals in the fuel gas header 110 are also configured in the same manner as in the first embodiment.

  In the drying apparatus 200 according to this embodiment, combustion air for burning the fuel gas injected from the fuel gas injection hole 112 is directly supplied from the longitudinal end of the drying space into the drying space from the combustion air pipe 124. Is done. At this time, the supply port 126 through which the combustion air in the combustion air pipe 124 is injected is positioned above the fuel gas header 110. Thereby, since combustion air diffuses and oxygen is supplied to each fuel gas injection hole 112, a soft flame of slow combustion can be formed.

  When supplying combustion air from one end of the drying space, the chimney 150 that discharges the exhaust gas generated by the combustion of the fuel gas, as shown in FIG. Provided on the other end side in the longitudinal direction. As a result, an air flow from the supply port 126 of the combustion air pipe 124 to the chimney 160 is formed in the drying space, and fuel gas can be supplied evenly into the drying space, and exhaust gas can be efficiently discharged from the chimney 150. Can do.

  That is, also in the drying apparatus 200 according to the present embodiment, as in the first embodiment, the fuel gas header 110 is provided in the vicinity of the bottom surface of the bowl 5 and the fuel gas is supplied at predetermined intervals in the longitudinal direction. Combustion air is supplied from above the combustion air piping 124. As a result, the fuel gas is necessary for combustion from the combustion air (that is, the secondary air) supplied to the dry space after being injected from the fuel gas injection hole 112 without using the primary air previously mixed with the fuel gas. Get all the oxygen and burn it. In this way, by forming a so-called red fire type combustion burner from the fuel gas header 110 and the combustion air pipe 124, a soft flame can be formed in the longitudinal direction of the fuel gas header 110.

  In addition, the partition plates 132 and 134 and the upper plate 140 form a substantially sealed drying space in the region where the amorphous refractory to be dried is applied, so that moisture is contained without inflow of cold outside air. A uniform low-temperature atmosphere suitable for drying an amorphous refractory can be formed. Thereby, the amorphous refractory material constructed in a long region in the longitudinal direction with respect to a long and slender member like a ridge can be uniformly dried without causing explosion or spalling. Further, the fuel gas can be effectively utilized by making the drying space almost sealed.

  Furthermore, the drying apparatus 200 according to the present embodiment can also be easily installed on site with a simple apparatus configuration, like the drying apparatus 100 according to the first embodiment. Therefore, by using the drying apparatus 200 according to the present embodiment, there is an effect that the working time can be shortened.

  For the drying apparatus according to the present invention, the atmosphere of the drying space formed and the time until the drying of the amorphous refractory was completed were verified. In this verification, the drying apparatus 100 having the configuration according to the first embodiment was used. The drying apparatus was installed in a large ridge having a width of 1060 mm and a depth of 1000 mm, in which an irregular refractory was applied over the length of 4400 mm. The fuel gas header of the drying device is a circular tube with a length of 3600 mm and a diameter of 80 A, and a fuel gas injection hole with a diameter of 5 mm is formed on the outer peripheral surface at a radial position orthogonal to the vertical direction. It is formed at intervals of 300 mm. The combustion air header is a circular tube having a length of 3600 mm and a diameter of 250 A. On the outer peripheral surface thereof, a combustion air injection hole having a diameter of 16 mm is 300 mm at a radial position orthogonal to the vertical direction. Are formed at intervals. The fuel gas injection hole of the fuel gas header and the combustion air injection hole of the combustion air header are formed at the same position in the longitudinal direction.

  As a comparative example, an amorphous refractory applied in the longitudinal direction over a length of 4400 mm inside a large bowl having a width of 1060 mm and a depth of 1000 mm was dried by the drying apparatus 10 having the configuration shown in FIGS. FIG. 6 is a perspective view showing a configuration example of the conventional drying apparatus 10. FIG. 7 is a partial sectional side view showing the conventional drying apparatus 10 shown in FIG. 8 is a cross-sectional view taken along the line BB in FIG.

  Similar to the drying apparatus of the present invention, the drying apparatus 10 places the fuel gas header 11 on the support members 13, 13 installed on the bottom surface of the large bowl 5, and above the area where the fuel gas header 11 is installed. An upper plate 14 is laid. The fuel gas header 11 is the same as that of the present invention, and is a circular tube having a length of 3600 mm and a diameter of 80A. The outer circumferential surface of the fuel gas header 11 has a radial direction orthogonal to the vertical direction as shown in FIG. At positions, fuel gas injection holes having a diameter of 5 mm are formed at intervals of 300 mm.

  In the drying apparatus 10, only the fuel gas not containing combustion air is injected from the fuel gas injection hole 12 from the fuel gas header 11, similarly to the drying apparatus 100 of the present invention. Further, the supply amount of the fuel gas is adjusted so that the flame formed in each fuel gas injection hole 12 does not directly collide with the irregular refractory constructed on the inner surface of the large bowl 5.

  The upper plate 14 was laid with a gap above the fuel gas header 11 at an appropriate interval in the longitudinal direction of the bowl 5. Combustion air necessary for combustion is introduced through the gap, and exhaust gas generated by the combustion of the fuel gas is discharged. In the drying apparatus 10, the three upper plates 14 were laid so that the longitudinal opening ratio of the gap above the fuel gas header 11 with respect to the fuel gas header 11 was 30%. In addition, the partition plate which partitions off the large bowl 5 in a longitudinal direction was not provided.

  Using these drying apparatuses, the atmospheric temperature of the drying space was set to 300 ° C., and the amorphous refractory was dried. The amount of fuel gas supplied until the atmospheric temperature in the drying space reaches 300 ° C. is shown in Table 1 below, and the change in the atmospheric temperature until the drying of the amorphous refractory is completed is shown in FIG.

  As shown in FIG. 9 and Table 1, in the comparative example using the conventional drying apparatus, the drying of the amorphous refractory was completed about 24 hours after the ignition of the drying burner. In the comparative example, the heat radiation from the gap between the upper plates above the fuel gas header is large, and the atmospheric temperature is set to 300 ° C., so that the middle period (8h to 16h) and the final period (16h to 24h) are 8 The amount of fuel gas supplied every hour had to be increased. The standard deviation of the ambient temperature at the completion of drying of the amorphous refractory was 33.2 ° C.

  On the other hand, in the example using the drying apparatus of the present invention, the drying of the amorphous refractory was completed about 16 hours after the ignition of the drying burner. At this time, the atmospheric temperature in the drying space rose to nearly 300 ° C. after about 8 hours from the ignition of the dry burner, and then maintained at about 300 ° C. The supply amount of fuel gas was constant. The standard deviation of the ambient temperature when the drying of the amorphous refractory was completed was 20.2 ° C., and it was found that the variation in the ambient temperature was smaller than that of the drying space as compared with the comparative example. In addition, spalling and explosion did not occur in the irregular refractories.

  From the above, by using the drying apparatus of the present invention, after igniting the drying burner, it is possible to form a low temperature atmosphere suitable for drying at an early stage and maintain the target atmospheric temperature, It was possible to dry early. The amount of fuel gas used is small, energy is saved, the ambient temperature deviation is small, and a uniform dry space atmosphere can be formed.

  The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious that a person having ordinary knowledge in the technical field to which the present invention pertains can come up with various changes or modifications within the scope of the technical idea described in the claims. Of course, it is understood that these also belong to the technical scope of the present invention.

  For example, in the above-described embodiment, the number of drying burners (fuel gas header, which is further a combustion air header in the case of the first embodiment) installed in the drying space is one, but the present invention is not limited to such an example. For example, a plurality of drying burners may be provided in the longitudinal direction of the bowl.

100, 200 Drying device 102 Support member 110 Fuel gas header 112 Fuel gas injection hole 114 Fuel gas piping 120 Combustion air header 122 Combustion air injection hole 124 Combustion air piping 132, 134 Partition plate 140 Upper plate 150 Chimney 160 Observation window

Claims (3)

A drying device for drying an irregular-shaped refractory constructed on the inner surface of a blast furnace
A fuel gas supply unit that is disposed at the bottom of the vat along the longitudinal direction of the vat and supplies fuel gas;
A combustion air supply unit for supplying combustion air from above the fuel gas supply unit;
In the longitudinal direction of the large bowl, a partition member that partitions the drying target area where the amorphous refractory to be dried is constructed from other areas,
An upper plate that covers the upper part of the drying target area partitioned by the partition member;
A discharge part for communicating the inside and the outside of the drying space formed by the vat, the partition member and the upper plate, and discharging the exhaust gas generated inside the drying space to the outside;
A drying device for a blast furnace.   2. The drying apparatus for a blast furnace ridge according to claim 1, wherein the combustion air supply section is disposed directly above the fuel gas supply section along a longitudinal direction of the ridge. The drying apparatus for a blast furnace bonito according to claim 1 or 2, wherein a fuel gas supply amount supplied from the fuel gas supply unit is adjusted so that a flame formed does not directly hit an inner surface of the bonito.

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