KR20230158753A - Hybrid type cooling device of hot briquetted iron with variable cooling method - Google Patents

Abstract

It has a primary cooling area where an inlet for high-temperature briquette iron is formed at one end, and a secondary cooling area which is connected to the other end of the primary cooling area and where immersion coolant is located, and at the other end of the secondary cooling area. A cylindrical rotating body including a cone-shaped outlet whose diameter is narrowed toward the outlet of the high-temperature briquette iron; a guide blade formed along the inner circumferential surface of the cone-shaped outlet and guiding cooled high-temperature briquette iron to be discharged toward the outlet; And a rotation unit that supports the outside of the rotation body and rotates the rotation body. It provides a hybrid cooling device of high temperature briquette iron with a variable cooling method, comprising a.

Description

Hybrid cooling device of hot briquetted iron with variable cooling method}

The present invention relates to a cooling device that can improve quality and improve facility configuration and operational efficiency when cooling high-temperature briquette iron. It can efficiently cool high-temperature briquette iron by applying the cooling method step by step to one rotating body. This relates to a hybrid cooling device for high-temperature briquette iron with variable cooling applied.

Hot Briquetted Iron (HBI) is a substitute for scrap iron manufactured by processing Direct Reduction Iron (DRI), which removes oxygen components from iron ore, using briquette equipment. Its quality is superior to scrap iron, making H-beam steel. It is mainly used as a material to make high-end products such as steel plates.

The production process of high temperature briquette iron is shown in Figure 1. Directly reduced iron is produced by removing oxygen present in iron ore using a gaseous reducing agent (CO, H ₂ ) or a solid-state reducing agent (carbon), and the directly reduced iron is stored in a storage bin (for temporary storage or discharge). After being moved to 10), it is put into the briquette process. With the briquette machine 20, the high-temperature direct reduced iron produced in the reduction furnace process can be manufactured into high-temperature briquette iron at about 600 to 700°C. The manufactured high-temperature briquette iron passes through the separator 30 and the screen device 40 and is then put into the cooling device 50 to cool the high-temperature briquette iron to 100°C or lower, and then the cooled high-temperature briquette iron is transferred to the transfer conveyor 60. It is moved to the storage space 70 through .

The high-temperature briquette iron produced through the above process must be cooled to a level below about 100℃, and the cooling device for the high-temperature briquette iron is used to determine the quality of the high-temperature briquette iron produced as a final product through the high-temperature briquette process and the operation rate of the entire process. It can be said that it is a facility of great importance as a facility that determines In a typical process, briquette iron with a temperature of about 600 to 650°C is molded and processed through a briquette machine and then input into the cooling device. In the cooling device, cooling is achieved through the transfer process of the high-temperature briquette iron.

In cooling high-temperature briquette iron, the most important thing is to minimize thermal stress caused by thermal unevenness between the inside and outside of the high-temperature briquette iron. If thermal stress due to cooling exists, cracks, including microcracks, may occur in the high-temperature briquette iron and may be damaged even by small external impacts.

In addition, it is also important to minimize the Leidenfrost effect during the cooling process of high-temperature briquette iron. The Leidenfrost phenomenon is a phenomenon in which when a high-temperature object is cooled, a vapor layer that is rapidly formed on the surface acts as an obstacle that delays cooling of the inside of the product, causing only the surface to cool rapidly and the inside to not be sufficiently cooled. says It is known that this Leidenfrost effect becomes more pronounced when a high-temperature object is directly immersed in coolant. This not only lowers cooling efficiency, but the inside of the high-temperature briquette iron may be discharged out of the cooling device in a state that is not sufficiently cooled. Therefore, additional cracks or swelling may occur due to thermal stress between the inside and outside of the high-temperature briquette iron, resulting in small external shocks. There is also a risk of damage. In addition, if a crack occurs in the high-temperature briquette iron, air can easily infiltrate from the outside to the inside, so the briquette iron may be oxidized and the metallization degree may decrease, which may cause a problem of lowering the quality of the high-temperature briquette iron.

Korean Patent No. 10-2077689 (registration date: 2020. 02. 10.) Korean Patent No. 10-0649732 (Registration Date: 2006. 11. 17.)

The technical problem to be achieved by the present invention is to apply step-by-step cooling to a single cooling device to minimize the Leidenfrost effect, reduce the temperature difference between the inside and outside of the high-temperature briquette iron, and improve the quality of the final produced high-temperature briquette iron. The purpose is to provide a hybrid cooling device of high temperature briquette iron with a variable cooling method that can be used.

In addition, another technical problem to be achieved by the present invention is to provide a hybrid cooling device for high-temperature briquette iron with a variable cooling method that can minimize the device size compared to a simple conveyor transportation method by applying a rotation type transportation method. There is a purpose.

Furthermore, another technical problem to be achieved by the present invention is a high-temperature briquette applied with a variable cooling method that can improve cooling efficiency by inducing an increase in the cooling surface area of the high-temperature briquette iron and efficiently removing the water vapor layer formed on the surface of the high-temperature briquette iron. The purpose is to provide a hybrid cooling device of iron.

The purpose of the present invention is not limited to the purposes mentioned above, and other purposes not mentioned will be clearly understood by those skilled in the art from the description below.

In order to solve the above problem, the present invention includes a primary cooling zone in which an inlet for high-temperature briquette iron is formed at one end, and a secondary cooling zone in which immersion coolant is located and connected to the other end of the primary cooling zone. , a cylindrical rotating body formed at the other end of the secondary cooling region and including a cone-shaped outlet whose diameter narrows toward the outlet of the high-temperature briquette iron; a guide blade formed along the inner circumferential surface of the cone-shaped outlet and guiding cooled high-temperature briquette iron to be discharged toward the outlet; And a rotation unit that supports the outside of the rotation body and rotates the rotation body; It is possible to provide a hybrid cooling device of high temperature briquette iron with a variable cooling method, characterized in that it includes a.

The rotating body may rotate with a predetermined inclination toward the outlet.

The rotating body is located between the other end of the primary cooling zone and one end of the secondary cooling zone, and may be provided with a non-contact temperature sensor that measures the temperature of the high-temperature briquette iron.

The rotation speed of the rotating body may be controlled according to the measured temperature of the high-temperature briquette iron.

The rotating body may include a first blade formed along the inner circumferential surface of the primary cooling area.

The rotating body may include a second blade formed along the inner circumferential surface of the secondary cooling area from one end of the secondary cooling area to the guide blade.

The second blade may be provided in a spiral form with an angle gradually increasing with respect to the inner peripheral surface of the rotating body up to the guide blade.

The second blade may change the rotational movement of the high-temperature briquette iron so that the contact area or contact time of the high-temperature briquette iron with the immersion coolant changes and induce movement to the outlet.

The primary cooling area may have a water spray member located on the upper inside of the other end, and the water spray member may spray water toward the secondary cooling area.

The water spray member may further include a plurality of spray nozzles from the inlet to the other end of the primary cooling area.

The water spray member may be differentially controlled so that the spray amount of the spray nozzle closest to the inlet is minimal and the coolant spray amount increases as it is positioned toward the other end of the primary cooling area.

The hybrid cooling device of high-temperature briquette iron with variable cooling method according to an embodiment of the present invention has a primary cooling area and a secondary cooling area in the rotating body, thereby minimizing the Leidenfrost effect by applying step-by-step cooling to one cooling device. It has the advantage of lowering the temperature difference between the inside and outside of the high-temperature briquette iron and improving the quality of the final produced high-temperature briquette iron.

In addition, by applying a rotation-type transfer method with a guide blade in the secondary cooling area, the device size can be minimized compared to the simple conveyor transfer method, and further, it induces an increase in the cooling surface area of the high-temperature briquette iron and increases the cooling surface area of the high-temperature briquette iron. It has the effect of improving cooling efficiency by efficiently removing the water vapor layer formed on the surface.

Figure 1 Cross-sectional view showing the general production process of high-temperature briquette iron,
Figure 2 is a cross-sectional view showing a hybrid cooling device for high-temperature briquette iron to which a variable cooling method is applied according to the first embodiment of the present invention;
Figure 3 is a cross-sectional view showing the rotating body of the hybrid cooling device for high-temperature briquette iron to which the variable cooling method is applied according to the second embodiment of the present invention;
Figure 4 is a cross-sectional view showing the rotating body of the hybrid cooling device for high-temperature briquette iron to which the variable cooling method is applied according to the third embodiment of the present invention;
Figure 5 is a cross-sectional view showing the rotating body of the hybrid cooling device of high-temperature briquette iron to which the variable cooling method is applied according to the fourth embodiment of the present invention;
Figure 6 is a cross-sectional view showing a hybrid cooling device for high-temperature briquette iron to which a variable cooling method is applied according to a fourth embodiment of the present invention;
Figure 7 is a cross-sectional view taken along line A-A' of Figure 6, showing the rotating body and rotating unit of the cooling device for high-temperature briquette iron according to an embodiment of the present invention;
Figure 8 is a simplified diagram showing an experimental device for an experimental example and a comparative example of a hybrid cooling device for high-temperature briquette iron using a variable cooling method according to another embodiment of the present invention;
Figure 9 is a graph showing the temperature change of high-temperature briquette iron according to air spray cooling time as an experimental result of the comparative example of Figure 8;
Figure 10 is a graph showing the temperature change of high-temperature briquette iron according to water spray cooling time as an experimental result of the experimental example of Figure 8.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. The embodiments introduced below are provided as examples so that the idea of the present invention can be sufficiently conveyed to those skilled in the art. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. Also, in the drawings, the length and thickness of layers and regions may be exaggerated for convenience. Like reference numerals refer to like elements throughout the specification.

Figure 1 is a cross-sectional view showing the general production process of high-temperature briquette iron, Figure 2 is a cross-sectional view showing a hybrid cooling device for high-temperature briquette iron to which a variable cooling method is applied according to the first embodiment of the present invention, and Figure 3 is a 2 is a cross-sectional view showing the rotating body of a hybrid cooling device of high-temperature briquette iron to which a variable cooling method is applied according to Example 2, and FIG. It is a cross-sectional view showing the rotating body, and Figure 5 is a cross-sectional view showing the rotating body of the hybrid cooling device of high-temperature briquette iron to which the variable cooling method is applied according to the fourth embodiment of the present invention, and Figure 6 is the fourth embodiment of the present invention. It is a cross-sectional view showing a hybrid cooling device for high-temperature briquette iron to which a variable cooling method is applied, and Figure 7 is a cross-sectional view taken along line A-A' of Figure 6, showing the rotating body of the cooling device for high-temperature briquette iron according to an embodiment of the present invention. It is a cross-sectional view showing the rotation unit, and Figure 8 is a simplified view showing an experimental device for an experimental example and a comparative example of a hybrid cooling device of high temperature briquette iron applying a variable cooling method according to another embodiment of the present invention, and Figure 9 is a The experimental results of the comparative example of Figure 8 are graphs showing the temperature change of high-temperature briquette iron according to the air spray cooling time, and Figure 10 is a graph showing the temperature change of high-temperature briquette iron according to the water spray cooling time as the experimental results of the experimental example of Figure 8. am.

Referring to Figures 1 to 10, the hybrid cooling device for high-temperature briquette iron to which the variable cooling method according to the present invention is applied includes a primary cooling area 101 in which an inlet 110 for high-temperature briquette iron is formed at one end, and the It is connected to the other end of the primary cooling area 101 and has a secondary cooling area 102 where immersion coolant (W) is located, and is formed at the other end of the secondary cooling area 102 and is made of high temperature briquette iron. A cylindrical rotating body 100 including a cone-shaped outlet 130 whose diameter narrows toward the outlet 120; A guide blade (200G) formed along the inner circumferential surface of the cone-shaped outlet 130 and guiding the cooled high-temperature briquette iron to be discharged toward the outlet 120; And it may include a rotation unit 300 that supports the outside of the rotation body 100 and rotates the rotation body 100. In the first cooling area 101, rapid temperature changes inside and outside the high-temperature briquette iron can be prevented through slow cooling to minimize the Leidenfrost effect during the air cooling process. Additionally, rapid cooling of the high-temperature briquette iron can be achieved through the secondary cooling area 102.

In detail, the hybrid cooling device for high-temperature briquette iron may include not only high-temperature briquette iron but also char or coke generated in the coal carbonization process. Furthermore, the high-temperature briquette iron hybrid cooling device can be applied to high temperature objects of 200°C or higher that require cooling in various industrial fields other than the steelmaking process.

The rotating body 100 can rotate with a predetermined inclination downward toward the outlet 120, and the immersion coolant W due to the cone-shaped outlet 130 whose diameter is narrowed toward the outlet 120. It has an arbitrary constant water level and can stay in the secondary cooling area (102). The heated immersion coolant (W) overflows toward the outlet 120 and is discharged, thereby preventing the immersion coolant (W) from rising above a certain temperature. The leaked immersion coolant (W) is in a heated state, and the heated coolant flows into the cooling tower and is cooled again, and then flows into the primary cooling area (N10) through the water spray member (N10) by a coolant circulation pump (not shown). It may be introduced into the interior of 101) or supplied to the secondary cooling area 102.

The primary cooling area 101 and the secondary cooling area 102 may be provided inside the rotating body 100 by being combined to have a cross-sectional step at the boundary area, and the diameter of the primary cooling area 101 is equal to the secondary cooling area 101. It may be provided to be smaller than the diameter of the cooling area 102. In other words, it can be seen that the difference in diameter between the primary cooling area 101 and the secondary cooling area 102 and the height of the step are determined depending on the level of the immersion coolant (W).

The rotating body 100 may have an inclination of 1° to 6° from the ground downward toward the outlet 120, and the inclination may be determined depending on the diameter and length of the rotating body 100. That is, if the diameter of the rotating body 100 is large and the length is short, the level of the immersion coolant (W) can be secured by further increasing the inclination.

The rotating body 100 is located between the other end of the primary cooling area 101 and one end of the secondary cooling area 102 to check the cooling state of the high-temperature briquette iron and measures the temperature of the high-temperature briquette iron. A non-contact temperature sensor 500 may be provided.

Furthermore, the rotation speed of the rotating body 100 may be controlled according to the measured temperature of the high-temperature briquette iron. That is, the temperature of the high-temperature briquette iron can be measured through the non-contact temperature sensor 500 at the boundary between the end of the primary cooling area 101 and the beginning of the secondary cooling area 102, and the temperature of the high-temperature briquette iron can be measured and rotated according to the measured temperature. By adjusting the rotation speed of the body 100, the transfer speed of high-temperature briquette iron can be controlled and the cooling state can be adjusted.

As shown in FIG. 2, in the hybrid cooling device of high-temperature briquette iron applying the variable cooling method according to the first embodiment of the present invention, the primary cooling area 101 has a water spray member N10 on the upper inside of the other end. Located, the water spray member N10 may spray water toward the secondary cooling area 102. The immersion coolant (W) can be supplied to the secondary cooling area 102 through the water spray member (N10), and the temperature of the immersion coolant (W) can be adjusted. The primary cooling temperature range in the primary cooling area 101 is preferably 300 to 350°C, where the Leidenfrost effect almost disappears. (The primary cooling temperature range is explained in detail in the experimental example below.)

The secondary cooling area (102), which is connected to the other end of the primary cooling area (101) and where the immersion coolant (W) is located, can be transferred for about 2 to 5 minutes based on the transfer time of high-temperature briquette iron. It can be calculated as an area, and preferably as an area that can have a transfer time of 3 to 4 minutes. If it is less than 2 minutes, the cooling time may be insufficient to reach 100°C or less, the final target temperature of high-temperature briquette iron, and if it exceeds 5 minutes, the size of the cooling device may be increased. In other words, since the Leidenfrost effect applied to high-temperature briquette iron is insignificant due to primary cooling, the secondary cooling area 102 is characterized by an immersion method that can realize rapid cooling while minimizing the size of the equipment.

The guide blade 200G has a shape in which a plurality of blade blades are formed along the inner circumferential surface of the cone-shaped outlet 130, and can guide cooled high-temperature briquette iron to be discharged toward the outlet 120. As described above, the rotation speed of the rotating body 100 is controlled according to the measured temperature of the high-temperature briquette iron and the cooling state can be adjusted. Control of the transfer speed is based on the rotational speed of the rotating body 100. It may include calculating the residence time of high-temperature briquette iron.

As shown in Figure 3, in the hybrid cooling device of high temperature briquette iron applying the variable cooling method according to the second embodiment of the present invention, the rotating body 100 has an inner circumferential surface of the primary cooling area 101. It may include a first blade 402 formed along.

In addition, the rotating body includes a second blade 202 formed along the inner circumferential surface of the secondary cooling area 102 from one end of the secondary cooling area 102 to the guide blade 200G. It may be.

That is, in the second embodiment of the present invention, it can be said that the high-temperature briquette iron hybrid cooling device of the first embodiment is further provided with a first blade 402 and a second blade 202.

Due to the rotational movement guided from the first blade 402 of the primary cooling area 101, high-temperature briquette iron can be transferred to the secondary cooling area 102 more efficiently than in the first embodiment. In addition, cooling efficiency due to air contact of high-temperature briquette iron can be further improved, thereby reducing the length of the primary cooling area 101. The transfer speed of the high-temperature briquette iron through the first blade 402, that is, the rotation speed of the rotating body 100, can be controlled according to the temperature of the high-temperature briquette iron measured through the non-contact temperature sensor 500.

The second blade 202 is formed along the inner circumferential surface of the secondary cooling area 102 together with the guide blade 200G and can guide high-temperature briquette iron to move toward the outlet 120. The high-temperature briquette iron flowing in from the primary cooling area 101 is transferred to the outlet 120 by the guide blade 200G, and the high-temperature briquette iron is immersed in the secondary cooling area 102 until transferred to the outlet 120. Additional secondary cooling may be performed by cooling water (W). For effective transport and cooling of high-temperature briquette iron, the width of the guide blade 200G and the second blade 202 may be provided with a length of 3 to 10 times the width or size of the high-temperature briquette iron.

The second blade 202 may be provided in a spiral form with an angle gradually increasing with respect to the inner peripheral surface of the rotating body 100 up to the guide blade 200G. Due to the shape of the second blade 202, the initial behavior of the high-temperature briquette iron in the secondary cooling area 102 may be different from the behavior at the cone-shaped outlet 130.

For example, the high-temperature briquette iron in the secondary cooling area 102 rotates in a state lower than the height of the immersion coolant (W) and maintains the immersed state in the first cooling mode, and the rotational movement of the high-temperature briquette iron is further implemented. A second cooling mode in the area around the outlet 120, that is, the cone-shaped outlet 130, which increases the contact surface area between the immersion coolant (W) and the high-temperature briquette iron, and a high temperature from the first cooling mode to the second cooling mode. It may have a movement mode including a third cooling mode that gradually increases the rotation height of the briquette iron. In the first cooling mode, the high-temperature briquette iron rotates at the minimum height at the beginning of immersion and moves less, allowing rapid cooling while minimizing damage due to rotation when cooling by immersion coolant (W). In addition, in the third cooling mode, active rotation of the high-temperature briquette iron is induced, so that the coolant present on the surface evaporates outside the immersion coolant (W), cooling the high-temperature briquette iron, and again inside the immersion coolant (W), the coolant and The contact surface area required for cooling can be increased, and the above process can be repeated to efficiently remove water vapor formed on the high-temperature briquette iron surface.

The second blade 202 may change the rotational movement of the high-temperature briquette iron so that the contact area or contact time of the high-temperature briquette iron with the immersion coolant changes and induce movement to the outlet 120. For example, the second blade 202 may be formed at different angles with respect to the inner peripheral surface of the rotating body 100 up to the outlet 120 area to change the rotational movement of the high-temperature briquette iron. That is, the second blade 202 and the guide blade 200G in the first cooling mode, second cooling mode, and third cooling mode may have different angles with respect to the outer peripheral surface of the rotating body 100. For example, in order to induce the high-temperature briquette iron to slide along the surface of the second blade 202 in the first cooling mode, the blade angle θ1 in the first cooling mode is a steep inclination angle with respect to the outer peripheral surface of the rotating body 100. It can be formed from 0 to 10 degrees to have . Additionally, the blade angle θ3 in the second cooling mode may be formed at 30 to 50 degrees with respect to the outer peripheral surface of the rotating body 100. Furthermore, the blade angle θ2 in the third cooling mode may be sequentially increased between the blade angle θ1 in the first cooling mode and the blade angle θ3 in the second cooling mode.

Therefore, in the secondary cooling area 102, the second blade 202 and the guide blade 200G induce a change in the movement mode of the high-temperature briquette iron and cool it, thereby minimizing damage to the high-temperature briquette iron during transportation at each cooling stage. It has the advantage of increasing the surface area and improving cooling efficiency by efficiently removing water vapor formed on the surface of high-temperature briquette iron.

As shown in Figure 4, the hybrid cooling device for high-temperature briquette iron to which the variable cooling method according to the third embodiment of the present invention is applied includes a second blade 203 and a plurality of spray nozzles to the hybrid cooling device for high-temperature briquette iron of the first embodiment. It can be said that a water spray member (N30) further including (N1, N2, N3,,) is provided.

That is, the rotating body 100 has a second blade 203 formed along the inner circumferential surface of the secondary cooling area 102 from one end of the secondary cooling area 102 to the guide blade 200G. ) may include. Furthermore, the second blade 203 may be provided in a spiral form with an angle gradually increasing with respect to the inner peripheral surface of the rotating body 100 up to the guide blade 200G. In addition, the second blade 203 may change the rotational movement of the high-temperature briquette iron so that the contact area or contact time of the high-temperature briquette iron with the immersion coolant (W) changes and induces movement to the outlet 120. The configuration and effect of the second blade 203 of the third embodiment of the present invention can be considered similar to the second blade 202 of the second embodiment of the present invention.

The water spray member (N30) of the hybrid cooling device for high-temperature briquette iron according to the third embodiment of the present invention includes a plurality of spray nozzles (N1, N2) from the inlet 110 to the other end of the primary cooling area 101. , N3,..) may be further included. Therefore, the cooling time can be further shortened by performing water cooling using a spray nozzle in the primary cooling area 101.

In this case, the water spray member N30 is configured such that the spray amount of the spray nozzle N1 closest to the inlet 110 is minimal and the coolant spray amount increases as it is positioned toward the other end of the primary cooling area 101. It may be differentially controlled.

That is, the water spray member (N30) minimizes the amount of coolant sprayed at the inlet 110 and increases toward the inside in order to prevent the high-temperature briquette iron moved through the inlet 110 from being rapidly cooled in the initial stage. It may be provided with a plurality of injection nozzles (N1, N2, N3,...).

For example, the water spray member N30 includes a coolant supply pipe that is connected to a plurality of nozzles and supplies coolant to each spray nozzle (N1, N2, N3, ...) at a constant pressure, and the inlet 110 The diameter of the injection nozzles (N1, N2, N3, ...) may be differentially applied as they are positioned in the inward direction, thereby controlling the injection amount to increase toward the inside.

In addition, as another example, the water spray member (N30) is connected to the plurality of spray nozzles (N1, N2, N3, ...), and the diameter of the pipe gradually increases inward from the inlet to reduce pressure loss. It may include a coolant supply pipe that controls the coolant spray amount so that the spray amount increases toward the inside.

As described above, the water spray member (N30) prevents rapid temperature changes inside and outside the high-temperature briquette iron through slow cooling by water spray to minimize the Leidenfrost effect during the initial cooling process, and prevents rapid temperature changes inside and outside the high-temperature briquette iron. In order to cool the inside of the machine, it can be implemented as a design using fluid dynamics including the concept of pressure loss to differentially apply the injection amount of each of the plurality of injection nozzles (N1, N2, N3, ...). . As an example, the size and shape of the cooling water supply pipe are made constant, and the diameters of each spray nozzle (N1, N2, N3, ...) are differentially applied to the spray nozzle for each position as it goes inside the rotating body 100. By reducing the pressure loss, the related coolant injection amount can be adjusted. As another example, the diameter of each injection nozzle (N1, N2, N3, ...) is kept constant, and from N1 to N3 ... The piping design gradually increases the diameter of the coolant supply pipe in each direction, allowing the coolant injection amount to be controlled through differential pressure loss.

As shown in Figure 5 or Figure 6, the hybrid cooling device for high-temperature briquette iron to which the variable cooling method according to the fourth embodiment of the present invention is applied includes a first blade 404 and a first blade 404 in the hybrid cooling device for high-temperature briquette iron of the first embodiment. It can be said that a water spray member (N40) further including two blades (204) and a plurality of spray nozzles (N1, N2, N3,,) is provided.

That is, the rotating body 100 may include a first blade 404 formed along the inner circumferential surface of the primary cooling area 101. Therefore, due to the rotational movement guided from the first blade 404, high-temperature briquette iron can be transferred to the secondary cooling area 102 more efficiently than in the first embodiment.

The rotating body 100 has a second blade 204 formed along the inner circumferential surface of the secondary cooling area 102 from one end of the secondary cooling area 102 to the guide blade 200G. It may include Furthermore, the second blade 204 may be provided in a spiral form with an angle gradually increasing with respect to the inner peripheral surface of the rotating body 100 up to the guide blade 200G. The second blade 204 may change the rotational movement of the high-temperature briquette iron so that the contact area or contact time of the high-temperature briquette iron with the immersion coolant (W) changes and induce movement to the outlet 120. Therefore, as described in the other embodiments, by cooling by inducing a change in the movement mode of the high-temperature briquette iron, damage to the high-temperature briquette iron can be minimized during transportation at each cooling stage, the cooling surface area can be increased, and the surface area of the high-temperature briquette iron can be increased. It has the advantage of improving cooling efficiency by efficiently removing water vapor.

The water spray member N40 may further include a plurality of spray nozzles N1, N2, N3, from the inlet 110 to the other end of the primary cooling area. Furthermore, the water spray member N40 is differentially controlled so that the spray amount of the spray nozzle closest to the inlet 110 is minimal and the coolant spray amount increases as it is located toward the other end of the primary cooling area 101. You can. Therefore, by performing water cooling using a spray nozzle in the primary cooling area 101, the cooling time can be shortened, and further, the initial rapid cooling of the high-temperature briquette iron can be prevented, and the interior of the high-temperature briquette iron can be effectively cooled. It can be.

The rotation unit 300, which supports the outside of the rotation body 100 and rotates the rotation body 100, includes a base frame (F), a support roller unit 310, and a base frame (F) to support the tilted rotation body 100. It may include a guide roller unit 320. The support roller unit 310 provided between the base frame (F) and the rotating body 100 can support the rotating body 100 so that the rotating axis of the rotating body 100 does not shake, and the guide roller unit (320) may serve to fix the position of the rotating body 100 so that it does not move forward and backward along the inclined plane. Therefore, even if the rotating body 100 is tilted, the rotational movement for cooling the high-temperature briquette iron can be maintained constant due to the rotating unit 300.

Additionally, the rotation unit 300 may be provided with a drive module (not shown) for rotating the rotation body 100, and the drive module may be of a gear type or chain type drive type. For example, in the case of a gear type, the drive module may include a motor that provides driving force, a pinion gear mounted on the motor, and a driving gear formed on the outer surface of the rotating body 100 and engaged with the pinion gear. Therefore, there is an advantage that the equipment operation rate can be improved and productivity can be improved by providing the rotation unit 300 outside the cooling device.

The rotating body 100 may further include a pump that discharges water vapor generated as the high-temperature briquette iron is cooled to the outside of the rotating body 100. The temperature inside the rotating body 100 may increase due to water vapor generated as the high-temperature briquette iron is cooled, or it may make it difficult to cool the high-temperature briquette iron. Accordingly, the rotating body 100 may be equipped with a pump for discharging water vapor to discharge water vapor to the outside of the rotating body 100.

The hybrid cooling device for the high-temperature briquette iron is cooled and discharged from the outlet 120, and the cooling water remaining on the outer peripheral surface of the high-temperature briquette iron is provided with a screen module 600 for separating the high-temperature briquette iron from the cone-shaped discharge of the rotating body. It can be provided outside the unit 130. Therefore, the remaining coolant separated by the screen module 600 moves to the coolant outlet 700 located at the outer lower part of the outlet 120, flows into the cooling tower, is cooled again, and then rotates the rotating body 100 by the coolant circulation pump. ) may flow into the interior. In addition, the cooled high-temperature briquette iron can be moved from the screen module 600 to the briquette iron outlet 800 and moved to the storage space 70 through the transfer conveyor 60.

Hereinafter, the cooling behavior of high-temperature briquette iron will be explained through the following experimental examples. The following experimental examples are only examples for illustrating the present invention, and the present invention is not limited thereto.

Experiment example

Figure 8 is a simplified diagram showing an experimental example and a comparative example of a hybrid cooling device for high-temperature briquette iron using a variable cooling method according to another embodiment of the present invention, for testing the cooling behavior of high-temperature briquette iron. It shows the device.

After heating the high-temperature briquette iron (1) to 650°C in a box furnace, it is cooled using a water spray nozzle (Nw) as shown in (b) of Figure 8, and the high-temperature briquette is measured using an infrared temperature sensor (5). The temperature of iron was measured. At this time, the water spray flow rate for observing the cooling behavior was 50 (ml/min, water mass flux), and the distance between the water spray nozzle (Nw) and the high-temperature briquette iron (1) was 3 cm.

Comparative example

As shown in (a) of Figure 8, the temperature of the high-temperature briquette iron was measured using an infrared temperature sensor (5) while cooling it using an air injection nozzle (Na). At this time, the air injection flow rate was 1000, 2000 (ml/min, water mass flux), and the distance between the air injection nozzle (Na) and the high temperature briquette iron (1) for observing the cooling behavior was 3cm. It was 5cm. The high-temperature briquette iron used in the experimental and comparative examples had a weight of approximately 510 ± 2 g.

result

Figure 9 is a graph showing the temperature change of high-temperature briquette iron according to the air spray cooling time as the experimental result of the comparative example of Figure 8, and Figure 10 is a graph showing the temperature change of the high-temperature briquette iron according to the water spray cooling time as the experimental result of the experimental example of Figure 8. This is a graph showing the change.

As shown in Figure 9, it can be seen that in the comparative example, the temperature distribution of high-temperature briquette iron by air spray cooling is cooled at a gradually slow rate overall without any unusual inflection point due to cooling during the cooling process. In other words, the Leidenfrost phenomenon was not observed because it was cooled by air.

As shown in Figure 10, in an experimental example in which water spray cooling was performed, it can be seen that there are sections where the cooling rate changes significantly throughout the entire cooling process, and the cooling rate is shown to change rapidly based on a temperature of about 400°C. This is due to the Leidenfrost phenomenon. When the temperature of high-temperature briquette iron is over about 400℃, a vapor layer is created on the surface of the material, delaying cooling. At temperatures below about 400℃, the Leidenfrost phenomenon gradually disappears. It shows that the cooling rate increases rapidly. It can be seen that the time required for cooling to 400°C is approximately 3 to 3.5 minutes.

The hybrid cooling device of high-temperature briquette iron with variable cooling method according to an embodiment of the present invention is provided with a primary cooling area (101) and a secondary cooling area (102) in the rotating body (100), thereby providing step-by-step cooling in one cooling device. By applying cooling, the Leidenfrost effect can be minimized, the temperature difference between the inside and outside of the high-temperature briquette iron can be reduced, and the quality of the final produced high-temperature briquette iron can be improved.

In addition, the secondary cooling area 102 is equipped with a guide blade 200G or a second blade 200 and applies a rotational transfer method, so that the device size can be minimized compared to a simple conveyor transfer method, and further, It has the effect of increasing the cooling surface area of high-temperature briquette iron and improving cooling efficiency by efficiently removing the water vapor layer formed on the surface of high-temperature briquette iron.

Although the present invention has been described above with reference to preferred embodiments, those skilled in the art may make various modifications and changes to the present invention without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that you can do it.

10; storage bin
20; briquette machine
30; separator
40; screen device
50; High temperature briquette iron cooling system
60; transfer conveyor
70; storage space
100; rotating body
101; Primary cooling area
102; Secondary cooling area
110; Inlet
120; outlet
130; Cone-shaped outlet
200G; guide blade
200, 202, 203, 204; 2nd blade
300; rotation unit
310; Support roller part
320; Guide roller part
400, 402, 404; 1st blade
500; Non-contact temperature sensor
600; screen module
700; coolant outlet
800; Briquette iron outlet

Claims (11)

It has a primary cooling area where an inlet for high-temperature briquette iron is formed at one end, and a secondary cooling area which is connected to the other end of the primary cooling area and where immersion coolant is located, and at the other end of the secondary cooling area. A cylindrical rotating body including a cone-shaped outlet whose diameter is narrowed toward the outlet of the high-temperature briquette iron;
a guide blade formed along the inner circumferential surface of the cone-shaped outlet and guiding cooled high-temperature briquette iron to be discharged toward the outlet; and
A hybrid cooling device for high-temperature briquette iron with a variable cooling method, comprising a rotation unit that supports the outside of the rotation body and rotates the rotation body.
According to paragraph 1,
The rotating body is a hybrid cooling device for high-temperature briquette iron with a variable cooling method, characterized in that it rotates with a predetermined inclination with the outlet directed downward.
According to paragraph 1,
The rotating body is located between the other end of the primary cooling zone and one end of the secondary cooling zone, and is a high-temperature briquette with a variable cooling method, characterized in that it is provided with a non-contact temperature sensor that measures the temperature of the high-temperature briquette iron. Steel hybrid cooling system.
According to paragraph 3,
The rotating body is a hybrid cooling device for high-temperature briquette iron with a variable cooling method, characterized in that the rotation speed is controlled according to the measured temperature of the high-temperature briquette iron.
According to paragraph 1,
The rotating body is a hybrid cooling device for high-temperature briquette iron with a variable cooling method, characterized in that it includes a first blade formed along the inner circumferential surface of the primary cooling area.
According to paragraph 1,
The rotating body includes a second blade formed along the inner circumferential surface of the secondary cooling area from one end of the secondary cooling area to the guide blade. Hybrid cooling system.
According to clause 6,
The second blade is a hybrid cooling device for high-temperature briquette iron with a variable cooling method, characterized in that the second blade is provided in a spiral form with an angle gradually increasing with respect to the inner peripheral surface of the rotating body up to the guide blade.
In clause 7,
The second blade is a hybrid of high-temperature briquette iron with a variable cooling method, characterized in that it changes the rotational movement of the high-temperature briquette iron and induces movement to the outlet so that the contact area or contact time of the high-temperature briquette iron with the immersion coolant changes. Cooling device.
According to paragraph 1,
In the primary cooling area, a water spray member is located on the upper inside of the other end,
A hybrid cooling device for high-temperature briquette iron, wherein the water spray member sprays water toward the secondary cooling area.
According to clause 9,
The water spray member is a hybrid cooling device for high temperature briquette iron with a variable cooling method, characterized in that it further includes a plurality of spray nozzles from the inlet to the other end of the primary cooling area.
According to clause 10,
The water spray member is differentially controlled so that the spray amount of the spray nozzle closest to the inlet is minimal and the coolant spray amount increases as it is located toward the other end of the primary cooling area. hybrid cooling system.