TW201842194A - Heating device and heating method of torpedo car - Google Patents

Abstract

This heating device heats the inside of a torpedo car while a torpedo car body is rotated so that a pig iron receiving port is positioned at a side of the torpedo car body, the heating device being provided with: a burner that is inserted into the inside of the torpedo car from the pig iron receiving port; and a lid that partially covers the lower side of the pig iron receiving port so that an opening ratio of the opening of the pig iron receiving port reaches a previously set opening ratio as seen in a side view.

Description

Heating device and heating method for mixed milling iron car

The invention relates to a heating device and a heating method for heating the inside of a hybrid milling iron car.

In the iron manufacturing plant, the molten milling iron manufactured in the blast furnace is transferred to a steel mill by a mixed milling iron car, and in the mixed milling iron car, preliminary processing of the molten milling iron such as desiliconization is performed. In order to accommodate high temperature molten iron milling, the inner wall of the mixed milling iron car is made of refractory. If the refractory is damaged due to the repeated operation of the mixed-mill iron car that handles the high-temperature molten-milled iron, the refractory is thickened. Afterwards, in order to accommodate the high-temperature molten milling iron again in the mixed-mill iron car where the new refractory has been constructed, the new refractory is dried and the interior of the mixed-mill iron car is preheated; or when the temporarily cooled mixed-mill iron car is used again, in order to protect the refractory The heating and heat preservation are performed in advance by a burner or the like.

Conventionally, when drying and warming up the interior of a mixed-mill iron car, flames and combustion gases are supplied by inserting a burner into a burner through the iron-receiving port to heat the interior of the mixed-mill iron car. When the inside of the mixed milling iron car is dried, it must take time to slowly heat up so that the refractory will not burst. On the other hand, during preheating, the graph is heated in a rapid manner to form a state that can quickly accept milling iron. During drying and preheating, the amount of COG (coke oven gas) is adjusted, and the amount of air is adjusted so as to become a constant air ratio in accordance with the amount of COG. At this time, the exhaust gas is discharged from the receiving iron port of the mixed milling car. However, in order to take out the burner, the receiving iron port is opened. The air intruded from the receiving iron port causes heat loss. Reduced efficiency. In addition, due to air intrusion, there is a problem that a large unevenness occurs in the temperature inside the mixed-mill iron car.

In the past, in the case of the iron-receiving mouth of the mixed-mill iron car, although the lid used for heat preservation was used after receiving the iron mill or when the car was empty, at this time, the lid that closed the iron-receiving mouth was not exhausted. Exporters. Therefore, it cannot be used when using a burner for drying and preheating.

Patent Document 1 discloses a heating device for a hybrid milling iron car, which can heat the internal gas environment without inserting a burner into the hybrid milling iron car during preheating or drying of the hybrid milling iron car.

Patent Document 2 discloses a method of inserting a burner into the inside of a mixed-mill iron car when the mixed-mill iron car is drying, and inserting an upper part of the upper part through a mouth of about 10 mm when receiving the iron-milling port to install a shielding plate. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent No. 4658231 [Patent Document 2] Japanese Patent Laid-Open No. 8-27510

[Problems to be Solved by the Invention] However, the heating device disclosed in the aforementioned Patent Document 1 uses a thermal storage burner, and the equipment cost is high. In addition, a structure for forcibly exhausting exhaust gas by a blower using a cover member of an air-tight lock at the injection inlet and outlet of a milled iron. In contrast, if it is a low-cost general burner, it is necessary to naturally exhaust the exhaust gas. The thermal storage burner having an airtight structure as described above cannot be applied.

Further, in the method disclosed in the aforementioned Patent Document 2, the receiving iron opening is viewed from the front, and the entire receiving iron opening is covered with a shielding plate. At this time, the exhaust gas discharged from the upper part of the receiving iron mouth is discharged while contacting the back surface of the shielding plate, and the high-temperature exhaust gas contacts the shielding plate more, so the heat load often acts, and the heat of the shielding plate occurs Deformation, etc.

The present invention has been made in view of this situation, and an object of the present invention is to provide a low-cost burner other than a thermal storage burner for drying or preheating the interior of a hybrid milling iron car, and to discharge the exhaust gas while suppressing the intrusion of outside air. A heating device and a heating method that perform high-efficiency and uniform heating.

[Means for solving the problem] In order to solve the above-mentioned problem, the present invention is a heating device for a hybrid milling iron car, which rotates the main body of the hybrid milling iron car so that the receiving iron port is located on a side of the main body of the hybrid milling iron car. The heating device for heating the inside of the mixed milling iron car is characterized by comprising: a burner inserted into the inside of the mixed milling iron car from the aforementioned iron milling port; and partially covering the aforementioned iron milling port in a side view. On the lower side so that the opening of the aforementioned iron-receiving port becomes a cover with a preset aperture ratio.

Preferably, the opening ratio is 10% to 80% of the area of the opening area of the iron receiving port divided by the cross-sectional area of the burner.

Preferably, the cover is supported by an elastic body having elasticity in a horizontal direction toward the iron receiving port.

An elastic refractory may also be attached to a portion of the cover that is in contact with the mixed-mill iron car on the surface of the receiving-mill-side surface of the cover.

It is preferable that the mounting angle of the cover with respect to the vertical direction is variable.

The cover may include an upper cover and a lower cover. The lower cover partially covers a lower side of the iron receiving port, and the upper cover is configured to be rotatable around a boundary with the lower cover.

The present invention in another aspect is a heating method for a mixed milling iron car, which is a heating method for heating the inside of the mixed milling iron car, and is characterized in that the main body of the mixed milling iron car is rotated so that the receiving iron port is located on the mixed milling iron. From the side of the car body, under the side view, a cover is used to cover the lower side of the iron-receiving iron port so that the opening of the iron-receiving iron port becomes a preset opening ratio, and the burner is turned from the iron-receiving iron port. It is inserted into the inside of a mixed milling iron car for heating.

Preferably, the aperture ratio is set in accordance with a flow rate of gas exhausted from the mixed milling iron car when the interior of the mixed milling iron car is heated.

[Effects of the Invention] According to the present invention, a cover is provided at the lower part of the receiving iron port, thereby preventing outside air from invading and discharging exhaust gas. Therefore, heating by a burner can be performed efficiently, and mixed milling can be realized. Uniform temperature distribution inside the car. Therefore, it is possible to achieve the reduction of the fuel for heating of the hybrid milling iron car or the shortening of the time, and it is possible to reduce the cost and make it operate efficiently. In addition, in the side view, the lower side of the receiving iron opening is partially covered by the cover, in other words, the upper side of the receiving iron opening is formed with an opening, so that the high-temperature exhaust gas contact cover that is discharged from the upper part of the receiving iron opening can be reduced It can cause thermal load, and can suppress the thermal deformation of the cover.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In this specification and the drawings, elements having substantially the same functional configuration are denoted by the same reference numerals, and redundant descriptions are omitted.

FIGS. 1 to 3 are diagrams illustrating a heating device according to an embodiment of the present invention. FIG. 1 is a diagram viewed from above the mixed milling iron car 10, FIG. 2 is a diagram viewed from the side of the mixed milling iron car 10, and FIG. Figure viewed from the front of the mixed milling iron car 10. As shown in FIG. 1, the hybrid milling iron car 10 includes a substantially long cylindrical hybrid milling iron body 11 that houses a molten milling iron manufactured in a blast furnace. The mixed-mill iron car body 11 has a structure rotatable about a long axis. In addition, a refractory 12 is constructed on the inner wall of the mixed-mill iron car body 11, and an iron-receiving port 13 is provided at the central portion in the longitudinal direction for taking out and placing the molten iron. In this embodiment, when the heating device 1 is used in the drying and preheating operation before receiving the iron milling, first, the mixed milling iron car body 11 is rotated so that the receiving iron mouth 13 of the mixed milling iron car 10 is located in the mixed milling iron. The side of the car body 11 receives the iron mill port 13 in a substantially vertical direction.

As shown in FIG. 2, the heating device 1 includes a burner 2 and a cover 4 fixed to the burner 2 through a support bracket 3. The burner 2 can use various burners other than the heat storage burner. For example, as shown in FIG. 1, the front end is divided into left and right sides, and the fire port is directed to both sides of the long side direction of the hybrid iron car 10. The burner 2 is mounted on a horizontally movable trolley 5 as shown in FIG. 2, for example, and can be moved on a horizontal rail. In the present embodiment, the cover 4 is fixed to the burner 2. When the burner 2 is inserted into the mixed-mill iron car 10, the cover 4 is installed at the position where the iron-receiving port 13 is received. However, the cover 4 may be fixed to a structural body portion of the heating device 1 other than the burner 2. In this specification, the longitudinal direction of the mixed-mill iron car body 11 is set to the left-right direction, and the direction orthogonal to the horizontal plane is the front-rear direction (the mixed-mill iron car 10 side is set to the front).

The opening area of the cover 4 with respect to the iron-receiving iron port 13 is to occlude a part of the iron-receiving iron port 13 at a side view point from which the iron-receiving iron port 13 is viewed from the front in order to achieve an opening ratio according to the condition during heating. If the opening ratio in this side view is too small, exhaust cannot be performed sufficiently. Due to the increase in internal pressure, the flow rate of the exhaust gas from the opening increases, the equipment load increases, or the scheduled fuel from the burner 2 does not flow, resulting in insufficient combustion. If the aperture ratio is too large, the outside air invades and the heating efficiency decreases, and the temperature becomes uneven. The opening ratio may be set to an optimal value according to the volume of the mixed milling iron car 10, the opening area of the receiving iron opening 13, the specifications of the burner 2, heating conditions, etc., but especially when the interior of the mixed milling iron car 10 is heated, The optimum value is preferably set based on the flow rate of the gas discharged from the hybrid milling iron 10. For example, in the present embodiment, it is set to 10% to 80% of the opening area of the opening area of the iron receiving port 13 divided by the cross-sectional area of the burner 2. In the present embodiment, the opening area of the iron receiving port 13 is reduced by the cover 4 to prevent outside air from invading and to secure an opening area for exhausting exhaust gas.

The cover 4 is attached so as to cover the lower side of the receiving iron opening 13 facing in a substantially vertical direction. If the cover 4 is disposed on the upper part of the iron receiving port 13, the exhaust gas is discharged while contacting the back surface of the cover 4. The high-temperature exhaust gas contacts the cover 4 more, so the heat load often acts, and the heat of the cover 4 occurs. Deformation. In contrast, the lower side is not easily affected by the exhaust gas. In this embodiment, as shown in FIG. 3, the shape of the cover 4 is substantially semicircular, and is formed into a meniscus shape in which a part of a central portion of the iron receiving port 13 inserted into the burner 2 is cut.

As shown in FIG. 2, the upper portion of the cover 4 is fixed to the burner 2 through the support bracket 3. The lower portion of the cover 4 is connected to the trolley 5 through a spring 6 having elasticity in the front-rear direction. The spring 6 is fixed to the bogie 5 and has elasticity in a direction in which the lower portion of the cover 4 is pressed toward the mixed-mill iron car 10 side. As shown in FIG. 3, the springs 6 are mounted at two places through lower brackets 7 provided at left and right two places on the lower part of the cover 4. In addition, on the rear surface of the cover 4, that is, a portion where the iron receiving port 13 and the peripheral edge portion 14 are in contact with each other on the side of the iron receiving port 13, an elastic refractory 8 such as a ceramic rope is attached. Each time the refractory 12 constructed on the mixed-milled iron car 10 is repeatedly used, the shape of the unevenness is different due to the influence of the attached matter, and the unevenness of the peripheral portion 14 will also change. Therefore, the cover is covered with an elastic body (spring 6). The lower part of 4 is pressed against the iron-receiving port 13 side, and the refractory 8 is provided to absorb the uneven shape of the peripheral edge portion 14 and eliminate the gap between the iron-receiving port 13 and the peripheral portion 14 to achieve a desired aperture ratio. The refractory 8 is attached to at least a portion in contact with the periphery of the lower end portion of the peripheral edge portion 14, or may be attached to the entire outer periphery of the cover 4 as shown in FIG. 3.

In addition, the cover 4 may be provided with a window 21 for visually inspecting the inside of the mixed milling iron 10. In addition, as shown in FIG. 2, an anti-inflammatory plate 22 may be provided near the upper portion of the iron receiving port 13 at an appropriate distance from the iron receiving port 13.

The method of using the above heating device 1 will be described.

After the refractory 12 inside the mixed-mill iron car 10 is re-pasted, the mixed-mill iron car body 11 is rotated so that the receiving iron port 13 formed in the center of the mixed-mill iron car body 11 is located on the side of the mixed-mill iron car body 11, And accept the iron milling port 13 into a substantially vertical direction. Next, the heating device 1 is disposed with respect to the iron-receiving port 13, the carriage 5 is moved, the burner 2 and the cover 4 slide toward the iron-receiving port 13, and the burner 2 is inserted from the iron-receiving port 13 to the mixed-mill iron cart 10. internal. At this time, the cover 4 is urged by the spring 6 to the iron receiving port 13 side, and the elastic refractory 8 mounted on the back of the cover 4 contacts the peripheral edge portion 14 of the iron receiving port 13, thereby also corresponding to the peripheral edge portion 14. The cover 4 is attached without gaps.

After that, the combustor 2 is used to dry and preheat the refractory 12 constructed on the inner wall surfaces of the mixed-mill iron car body 11 at both ends in the longitudinal direction from the central portion formed with the receiving iron opening 13. While the lower cover 4 suppresses the intrusion of outside air, the exhaust gas is discharged through the upper opening.

As described above, according to this embodiment, when the inside of the mixed milling iron car 10 is heated, the cover 4 is provided to ensure the outlet of the exhaust gas while suppressing the invasion of outside air, so that the heating can be performed efficiently and uniformly. Then, due to the increase in heating efficiency, fuel reduction, short warm-up time, and cost reduction can be achieved.

In the above embodiment, the upper end portion and the lower end portion of the cover 4 are preferably capable of adjusting the mounting angles, for example, as shown in FIG. 4, and are fixed by rotatable pins 31 and 32. The illustration of the cart 5 is omitted in FIG. 4. At this time, the upper end portion of the cover 4 is rotated by the pin 31 and the lower end portion of the cover 4 is rotated by the pin 32, so that the cover 4 can be inclined from the vertical direction. Thereby, even in a case where the receiving iron opening 13 is not in a strict vertical direction, the cover 4 can be attached according to the angle of the receiving iron opening 13.

In addition, for example, when the refractory 12 equipped with the hybrid milling iron 10 is dried and preheated, the amount of exhaust gas and the like are different. Therefore, the opening rate of the iron receiving port 13 can be adjusted according to the heating condition. For example, during drying, the flow rate (COG amount) of the combustion gas is small and the flow rate of the exhaust gas is small. Therefore, the aperture ratio is preferably 10% to 50%. On the other hand, since the flow rate of exhaust gas increases during preheating, the opening ratio is preferably 30% to 80%.

As for the method of adjusting the aperture ratio, for example, as shown in FIGS. 5 and 6, the cover 4 may be divided into an upper cover 4 a and a lower cover 4 b, and the lower cover 4 b may be rotated to adjust the opening degree with respect to the upper cover 4 a. The illustration of the cart 5 is omitted in FIG. 5. The lower cover 4b is provided with a spring 6 in the same manner as described above. With the spring 6, the lower cover 4b is pushed on the side of the mixed milling iron 10, and partially covers the lower portion of the receiving iron opening 13. The upper cover 4a and the lower cover 4b are connected at their boundary, for example, by a joint 41 such as a hinge. In addition, the upper cover 4a is provided with a moving mechanism 42 that moves the upper cover 4a in the front-rear direction. Thereby, the upper cover 4a is comprised so that the junction of the upper cover 4a and the lower cover 4b, ie, the lower end of the upper cover 4a can rotate freely as a center. At this time, only the lower cover 4b becomes 80% of the maximum opening rate of the iron-receiving port 13 when it is covered by the iron-receiving port 13, and the entire upper cover 4a and the lower cover 4b are covered when the iron-receiving port 13 is covered. The minimum opening rate of the receiving iron port 13 is 10%. Specifically, for example, if the upper cover 4a covers 70% of the iron-receiving port 13 and the lower cover 4b covers 10% of the iron-receiving port 13, the upper cover 4a and the lower cover 4b can be used at 10% ~ The opening ratio of the receiving iron port 13 is adjusted between 80%. Among them, a refractory 8 is attached to the back surface of the upper cover 4a and the back surface of the lower cover 4b, respectively.

The method of adjusting the aperture ratio is not limited to the method described above. For example, the position of the upper end of the cover 4 can be formed to be movable in the front-rear direction, and the mounting angle of the cover 4 relative to the receiving iron opening 13 can be changed. When the opening ratio is increased, the upper end of the cover 4 is directed to the rear. Move to adjust the opening.

Here, in the method disclosed in the above-mentioned Patent Document 2, a shield plate is attached by opening the upper portion by about 10 mm at the receiving iron opening, but the shield plate is fixed to the same 10 mm. That is, adjusting the aperture ratio of the iron-receiving iron port 13 as shown in this embodiment is not disclosed in Patent Document 2, nor is it implied. In this regard, as shown in the present embodiment, the opening ratio of the receiving iron opening 13 can be adjusted, and thereby the degree of freedom of the heating device 1 can be particularly improved.

The preferred embodiment of the present invention has been described above, but the present invention is not limited to this example. Those who are familiar with this technology in this field will clearly know that they can think of various changes or amendments within the scope of the technical ideas described in the scope of the patent application. Of course, they can also be understood as those who belong to the technical scope of the present invention. . [Example 1]

In the example of the present invention, a cover 4 shown in FIG. 1 to FIG. 3 is provided under the receiving iron opening 13 of the mixed milling iron car 10 to dry and preheat the inside of the mixed milling iron car 10. Further, in a comparative example, the interior of the mixed-mill iron 10 is dried and preheated while the iron-receiving port 13 is left open without providing a cover.

In the examples of the present invention and the comparative examples, the capacity of the mixed milling iron car 10 is 60 m ³ (melting milling iron 300 tons), the opening area of the receiving iron port 13 is 1.17 m ² , and the cross-sectional area of the burner ² is 0.23 m ² . In addition, the size of the cover 4 was changed to 0.75m ² , 0.47m ² , and 0.19m ² , and the cover 4 was closed to change the opening ratio of the iron receiving port 13 except the burner 2 to 80%, 50 %, 20%.

In addition, in the examples of the present invention and the comparative examples, as shown in FIGS. 7 (a) and 7 (b), thermocouples No. 1, No. 2, and No. 3 were installed in 3 places inside the mixed-mill iron car 10, and heating was measured. Temperature. The thermocouple No. 1 is set to the long-side end of the hybrid milling car 10, and the thermocouple No. 2 and thermocouple No. 3 are in the long-side direction near the receiving iron opening 13 and away from the receiving iron opening 13. Depth of distance at different locations. The temperature and oxygen concentration at each position were measured at the time of drying 15 hours after the start of heating and the time of preheating after 30 hours. The results are shown in Table 1 when the aperture ratio is 80%, the results are shown in Table 2 when the aperture ratio is 50%, and the results are shown in Table 3 when the aperture ratio is 20%.

[Table 1] ＜ Aperture ratio 80% ＞

[Table 2] ＜ Aperture ratio 50% ＞

[Table 3] ＜ Aperture ratio 20% ＞

From Tables 1 to 3, it was confirmed that in any of the opening ratios of 20% to 80%, compared with the comparative example, the internal temperature of the mixed milling iron car of the present invention was uniformly increased. In addition, regarding the oxygen concentration, it can be confirmed that the examples of the present invention are lower than the comparative examples, and air intrusion is suppressed. In addition, about 15% of total COG can be saved. On the other hand, the aperture ratio is further reduced. When it is set to 10%, the internal pressure rises, the flow rate of the exhaust gas from the opening portion increases, and the equipment load increases. In addition, the predetermined fuel from the burner 2 does not flow and under-combustion occurs, so it cannot be performed continuously. [Industrial availability]

The present invention is applicable as a heating device when a burner is used to heat the interior of a mixed-mill iron car, and is used when heating is performed using a burner other than a thermal storage burner.

1‧‧‧Heating device

2‧‧‧ burner

3‧‧‧ support bracket

4‧‧‧ cover

4a‧‧‧upper cover

4b‧‧‧lower cover

5‧‧‧ trolley

6‧‧‧ spring

7‧‧‧ lower bracket

8‧‧‧ Refractory

10‧‧‧ Mixed milling iron car

11‧‧‧ Mixed milling iron car body

12‧‧‧ Refractory

13‧‧‧ Accepts iron milling mouth

14‧‧‧periphery

21‧‧‧ windows

22‧‧‧disaster prevention board

31, 32‧‧‧pin

41‧‧‧Joint

42‧‧‧ Mobile agency

FIG. 1 is a schematic view of a state when the heating device according to this embodiment is used when viewed from the top of a hybrid milling iron car. FIG. 2 is a schematic view of a state in which the heating device according to this embodiment is used when viewed from the side of a hybrid milling iron car. Fig. 3 is a front view showing the shape of the lid of the heating device of the embodiment. FIG. 4 is a schematic view of a state in which the heating device according to another embodiment is used when viewed from the side of the hybrid milling iron car. FIG. 5 is a schematic view of a state in which the heating device according to another embodiment is used when viewed from the side of the hybrid milling iron car. Fig. 6 is a front view showing a shape of a cover of a heating device according to another embodiment. FIG. 7 is a diagram showing the positions of the thermocouples in the example, (a) shows the long-side direction of the mixed-mill iron car, and (b) shows a direction orthogonal to the long-side direction.

Claims (8)

A heating device for a mixed milling iron car, which is a heating device for heating the inside of a mixed milling iron car in a state where the main body of the mixed milling iron car is rotated so that the receiving iron port is located on the side of the mixed milling iron car body. It is provided with: a burner inserted into the mixed-mill iron car from the iron-receiving iron port; and a cover partially covering the lower side of the iron-receiving iron port in a side view so that the The opening becomes a preset opening ratio. For example, the heating device for a hybrid milling iron car according to claim 1, wherein the opening ratio is 10% to 80% of the area of the opening area of the iron receiving port divided by the cross-sectional area of the burner. The heating device of the mixed milling iron car according to claim 1 or 2, wherein the cover is supported by an elastic body that is elastic in a horizontal direction toward the receiving iron milling port. The heating device for a hybrid milling iron car according to any one of claims 1 to 3, wherein a portion of the lid that is connected to the aforementioned side of the side receiving the milling iron mouth and the hybrid milling iron car is provided with an elasticity Refractory. The heating device for a hybrid milling iron car according to any one of claims 1 to 4, wherein the installation angle of the aforementioned cover with respect to the vertical direction is variable. According to the heating device for a hybrid milling iron vehicle according to any one of claims 1 to 5, the cover is provided with an upper cover and a lower cover, the lower cover partially covers a lower side of the iron receiving port, and the upper cover is configured as Rotate freely around the boundary with the lower cover. A heating method for a mixed milling iron car, which is a heating method for heating the inside of the mixed milling iron car, which is characterized in that: the main body of the mixed milling iron car is rotated so that the receiving iron port is located on the side of the mixed milling iron car body, In a side view, a cover is used to cover the lower side of the iron-receiving iron port so that the opening of the iron-receiving iron port becomes a preset opening ratio, and from the iron-receiving iron port, a burner is inserted into the Inside to heat. For example, the heating method for a hybrid milling iron car according to claim 7, wherein the aforementioned aperture ratio is set according to a flow rate of gas exhausted from the hybrid milling iron car when the interior of the hybrid milling iron car is heated.