KR20110120598A - Apparatus and method for preheating and controlling ladle using steel manufacture ladle array - Google Patents

Abstract

PURPOSE: A ladle heating device using a steel manufacture ladle array, a controller of a ladle heating and a method thereof are provided to minimize the temperature deviation between the lower part and upper part of a ladle by making a ladle temperature rising. CONSTITUTION: A ladle heating device using a steel manufacture ladle array, a controller of a ladle heating and a method thereof comprise the following steps. Drying temperature rising ladle objects(10,10a,10b,10c,10d) are selected from user. The burner of the ladle heater is used. The exhaust gas generated from the temperature rising work one or more ladle is inhaled. The temperature of the drying temperature rising object ladle is measured. The satisfaction of the drying temperature rising object ladle satisfies the first critical temperature is determined.

Description

       Ladle heating device, ladle heating control device using steelmaking ladle array, and method thereof {Apparatus and method for preheating and controlling ladle using steel manufacture ladle array}

       FIELD OF THE INVENTION The present invention relates to ladle heating devices, ladle heating controls, and methods thereof using a steelmaking ladle arrangement. More particularly, the present invention relates to a ladle heating apparatus, a ladle heating control apparatus, and a method for performing ladle heating using a flue gas generated from a steelmaking ladle array in a low temperature section.

       Ladle (ladle) is a container containing the molten steel in the process of producing steel or non-ferrous metal, it is preheated to a high temperature before the molten iron.

       For example, in the steel process it is heated to 1200 ℃ over 8 to 30 hours. These ladles reduce the thermal shock by preheating before repairing or dropping, walking the life of the refractory, and delaying the temperature drop between the molten iron or the interlude.

       However, since the ladle contains hot water, the refractory in the ladle is frequently broken, so that the refractory is frequently repaired and repaired, and the refractory curing and heating are frequently performed.

       In general, the ladle is heated through a ladle heater, such as a burner attached to the ladle cover of the ladle heater, and when the ladle is completely heated to a predetermined temperature, the ladle cover is detached from the ladle and removed.

In the present invention, when ladle is heated in a low temperature section (about 500 ℃ or less), by performing the ladle temperature by using the exhaust gas generated from the steelmaking ladle arrangement, ladle that can occur when performing the ladle temperature using a burner in the low temperature section The aim is to minimize the temperature deviation between the top and bottom. At this time, it is possible to save energy because it recovers and uses the exhaust gas generated during the other ladle heating operation.

       Ladle heating method using a steelmaking ladle arrangement according to the present invention, the ladle heating control device, the step of receiving the ladle to be heated up temperature from the user; Sucking dry exhaust gas generated from at least one ladle in a temperature raising operation by using a burner of a ladle heating apparatus to dry-heat up the dry heating target ladle; Measuring the temperature of the dry heating target ladle to determine whether the temperature of the dry heating target ladle satisfies a first critical temperature; And when the temperature of the dry heating target ladle satisfies a first critical temperature, stopping the dry heating of the dry heating target ladle and heating the dry heating target ladle using a burner of the ladle heating apparatus. .

       In particular, the flue gas generated from the at least one ladle is branched to each of the heat exchanger and the drying target ladle through a flue gas line, and is generated from at least one ladle in a temperature raising operation using a burner of the ladle heating apparatus. The step of sucking up the dry gas by drying the ladle to increase the drying temperature, the exhaust gas flow control valve for controlling the flow rate of the exhaust gas flowing into the heat exchanger and the exhaust gas flow control for controlling the flow rate of the exhaust gas flowing into the dry heating target ladle Controlling the opening amount of the valve, respectively, to reduce the amount of exhaust gas delivered to the heat exchanger, and to increase the amount of exhaust gas delivered to the drying temperature target ladle.

       In addition, the step of sucking up the exhaust gas generated from the at least one ladle during the heating operation by using the burner of the ladle heating device to dry up the drying temperature target ladle, the step of periodically measuring the temperature of the drying temperature target ladle ; And controlling the opening amount of an exhaust gas flow control valve for controlling a flow rate of the exhaust gas flowing into the drying raising target ladle according to the temperature rising pattern of the drying raising target ladle.

       In addition, when the temperature of the dry heating target ladle satisfies a threshold temperature, the step of stopping the drying temperature of the drying heating target ladle, by sucking the exhaust gas generated from the at least one ladle to discharge to the dry heating target ladle. Stopping driving of the exhaust gas suction fan; And closing an exhaust gas flow control valve for controlling the flow rate of the exhaust gas flowing into the exhaust gas suction fan.

       In addition, the first critical temperature is characterized in that between 400 ℃ to 500 ℃.

       In addition, the step of heating the dry heating target ladle using a burner of the ladle heating apparatus, the step of periodically measuring the temperature of the dry heating target ladle; And controlling an opening amount of an exhaust gas flow control valve for controlling a flow rate of fuel flowing into the ladle heating apparatus according to the temperature rising pattern of the ladle to be heated up.

       The controlling of the opening amount of the exhaust gas flow control valve for controlling the flow rate of the fuel flowing into the ladle heating apparatus according to the temperature rising pattern of the ladle to be heated up is the second threshold temperature of the ladle to be warmed up. Determining whether the temperature is satisfied; And controlling the opening amount of the exhaust gas flow control valve to maintain the temperature of the dry-heating target ladle at the second critical temperature when the temperature of the dry-heating target ladle satisfies the second critical temperature. It is done.

       In addition, the second critical temperature is characterized in that between 1100 ℃ to 1200 ℃.

       Ladle heating control apparatus using a steelmaking ladle arrangement according to the present invention, the input unit for receiving a selection of the drying target ladle from the user; Ladle temperature sensing unit for measuring the temperature of the drying temperature target ladle; When the ladle to be heated up is selected through the input unit, an IDF for drying and drying the ladle to be heated up by starting a flue gas suction fan that sucks exhaust gas generated from at least one ladle being heated up by using a burner of a ladle heater. A drive control unit; And determining whether the temperature of the drying temperature rising ladle satisfies a first critical temperature by using the temperature of the drying temperature rising ladle measured by the ladle temperature sensing unit, and the temperature of the drying temperature rising ladle is the first critical temperature. When the temperature is satisfied, the main control unit is configured to stop driving of the exhaust gas suction fan to stop drying of the ladle heating target ladle, and to control a burner of the ladle heating device of the drying rising target ladle to heat the ladle heating target ladle. Equipped.

       In particular, the flue gas generated from the at least one ladle is branched to each of the heat exchanger and the drying-heating target ladle through an exhaust gas line, and the main control unit is configured to control the flow rate of the flue gas flowing into the heat exchanger. By controlling the opening amount of the exhaust gas flow control valve for regulating the flow rate of the exhaust gas flowing into the valve and the heating target ladle, the amount of exhaust gas delivered to the heat exchanger is reduced, the amount of exhaust gas delivered to the drying temperature target ladle It is characterized by increasing.

       In addition, the ladle temperature sensing unit periodically measures the temperature of the drying temperature target ladle, the main control unit, based on the temperature measured by the ladle temperature sensing unit, adjusts the flow rate of the exhaust gas flowing into the drying temperature target ladle. It is characterized in that for controlling the opening amount of the exhaust gas flow control valve.

       In addition, the main control unit is characterized in that for closing the exhaust gas flow rate control valve for stopping the driving of the exhaust gas suction fan, the flow rate of the exhaust gas flowing into the exhaust gas suction fan.

       On the other hand, ladle heating apparatus according to the present invention, the exhaust gas suction fan for sucking the exhaust gas generated from at least one ladle during the temperature increase operation; And a ladle cover having a plurality of exhaust gas inlets for discharging the exhaust gas sucked by the exhaust gas suction fan into the ladle to be heated up, and a plurality of exhaust gas outlets for discharging the exhaust gas generated from the ladle to be heated up to the outside. Equipped.

       In particular, the exhaust gas inlet is perforated to have a predetermined inclination with a predetermined interval in the circumferential direction of the ladle cover.

       In addition, the ladle cover, characterized in that the central portion is provided with a burner for heating the drying target ladle to perform a temperature raising operation.

       In addition, the ladle cover is characterized in that it comprises a thermocouple for measuring the temperature of the drying temperature target ladle.

       According to the present invention, the following effects can be expected.

       When ladle is heated in low temperature section (about 500 ℃ or less), when ladle temperature is increased by using flue gas generated from steelmaking ladle array, the temperature deviation is lower in low temperature section than temperature by burner because ladle is dried by exhaust gas. Lose.

       Therefore, it is possible not only to improve the life of the ladle refractory by preventing the sudden rise in temperature in the low temperature section, but also to save energy by contributing to the reduction of energy by using the exhaust gas generated during other ladle heating operation in the high temperature section.

1 is a graph showing the temperature rising pattern inside the ladle during the ladle heating operation.
2 is a view for schematically illustrating a ladle heating system using a steelmaking ladle arrangement according to the present invention.
3 is a view showing a schematic shape of a ladle heating apparatus applied to the present invention.
4 and 5 are views for explaining a ladle heating apparatus applied to the present invention.
6 is a block diagram illustrating the configuration of a ladle heating control device according to the present invention.
7 is a flowchart illustrating a ladle heating method using a steel ladle array according to the present invention.

       The present invention will now be described in detail with reference to the accompanying drawings. Here, the repeated description, well-known functions and configurations that may unnecessarily obscure the subject matter of the present invention, and detailed description of the configuration will be omitted. Embodiments of the present invention are provided to more completely describe the present invention to those skilled in the art. Accordingly, the shape and size of elements in the drawings may be exaggerated for clarity.

       First, the molten iron from the blast furnace is transported to the steelmaking process using Torpedo Ladle Car (TLC), the molten iron arriving at the steel mill is repaired from the TLC to the molten iron loading ladle, the repaired ladle desulfurization by mechanical stirring method After pretreatment at the facility (KR: Kanvara Reactor), it is charged to the converter. After charging the converter, take the molten steel with a molten steel lathing ladle and transport it to the performance tundish for continuous casting. These ladles reduce the thermal shock by preheating before repairing or dropping, thereby increasing the life of the refractory and delaying the temperature drop of the molten or molten steel.

       On the other hand, the ladle has a predetermined temperature increase pattern (see Figure 1) according to the internal refractory, it is possible to prevent refractory heat explosion and long life only if the temperature rise operation in accordance with this.

       If a sudden temperature change occurs during the ladle heating operation (especially in the low temperature range of 150 ° C. to 400 ° C.), there is a possibility of refractory explosion due to an increase in the steam pressure inside the ladle.

       However, in the related art, since ladle drying and preheating are performed using only a burner installed in the middle of the ladle cover, a temperature difference between the upper part of the ladle and the lower part of the ladle occurs during the temperature raising operation.

       In order to solve this problem, in the prior art, the temperature difference between the upper and lower ladles is reduced through excess air combustion in a low temperature section of 400 ° C. or lower, but a temperature difference of about 100 ° C. still occurs between the upper and lower ladles.

       The present invention has been proposed to solve such a problem, and aims to allow the temperature raising operation to be evenly performed so that a temperature difference between the upper and lower ladles does not occur during the temperature raising operation, and in particular, discharged from the adjacent steelmaking ladle in the low temperature region. By performing the ladle temperature increase operation using the exhaust gas, it is characterized by minimizing fuel consumption due to the ladle temperature rise.

       The following shows the English abbreviation used in the present invention.

       (GSV: Gas Shut-off Valve) -Gas On / Off Valve

       (GFCV: Gas Flow Control Valve) -Gas Flow Control Valve

       (AFCV: Air Flow Control Valve) -Air Flow Control Valve

       (CV: Check Valve) -Check Valve

       (FDF: Forced Draft Fan)-Combustion Air Fan

       (IDF: Induced Draft Fan) -Exhaust Gas Suction Fan

       (WFCV: Waste gas Flow Control Valve) -Exhaust Gas Flow Control Valve

       (WSV: Waste gas Shut-off Valve) -Exhaust gas on / off valve

       Figure 2 is a view for schematically illustrating a ladle heating system using a steelmaking ladle arrangement according to the present invention, Figure 3 is a view showing a schematic shape of a ladle heating apparatus applied to the present invention.

       A ladle heating system using a steelmaking ladle arrangement according to the invention consists of a ladle heating device, a ladle heating control device, a heat exchanger, a combustion air fan, an exhaust gas suction fan, and a plurality of valves.

       Ladle heaters are generally arranged in a small number of two, as many as seven to eight, and the following description is an example of the case where four ladles and four ladle heaters corresponding thereto are arranged to facilitate understanding of the present invention. Will be explained.

       Four ladles consisting of the first ladle 10a, the second ladle 10b, the third ladle 10c, and the fourth ladle 10d are heated by respective ladle heating devices corresponding thereto.

       First, each ladle heater receives the fuel required by the burner through the gas line 50. At this time, GVS (1a, 1b, 1c, 1d) and GFCV (2a, 2b, 2c, 2d) located at the front of each ladle heater can selectively supply fuel (gas) to the ladle heater according to the operation situation. To control.

       Hereinafter, each ladle heating device corresponding to the first ladle 10a, the second ladle 10b, the third ladle 10c, and the fourth ladle 10d may be provided with a first ladle heating device and a second ladle heating device. The apparatus, the third ladle heating apparatus, and the fourth ladle heating apparatus will be referred to as. Meanwhile, in FIG. 2, gas lines (pipes), air lines (pipes), exhaust gas lines (pipes), and the like are shown connected to ladles 1a, 1b, 1c, and 1d, but are not connected to ladles. It is connected to a ladle control that heats the ladle.

       In addition, the first ladle heating device, the second ladle heating device, the third ladle heating device, and the fourth ladle heating device are connected to the heat exchanger 55 through the air line 80, and have a high temperature section (eg, 500 ° C.). In the case of heating the ladle using a burner, the combustion air supplied from the heat exchanger 55 is used. At this time, the AFCV (7a, 7b, 7c, 7d) is installed on the air line 80 to adjust the flow rate of the combustion air flowing into the ladle heater.

       The exhaust gas discharged from the heat exchanger 55 is sucked by the main IDF 30 and discharged to the outside. The FDF 40 supplies the combustion air necessary for raising the ladle to the heat exchanger 55.

       On the other hand, there may be a variety of cases depending on the operation situation, in order to help the understanding of the present invention below, the first ladle 10a and the fourth ladle 10d is in the heating operation using the burner of the ladle heating apparatus, It is assumed that the second ladle 10b is at rest, and the third ladle 10c is a 'dry ladle to be heated'.

       In this case, the first ladle heating device and the fourth ladle heating device perform a temperature raising operation at a high temperature section (above 500 ° C.) by using a burner similarly to a general ladle heating device.

       At this time, GSV1 (1a) and GSV4 (1d) of the first ladle heater and the fourth ladle heater are opened, and the GFCV1 (2a) and GFCV4 (2d) are heated at the ladles (first ladle and fourth ladle). Perform flow control according to the pattern.

       Then, GFCV2 (2b), GFCV3 (2c), GSV2 (1b) and GSV3 (1c) are closed. The air line 80 transfers high-temperature combustion air (typically 400 ° C. to 550 ° C.) to the first ladle heater and the fourth ladle heater through heat exchange with the exhaust gas through the WFCV5 (3e) in the heat exchanger 55. Supply.

       Here, AFCV1 (7a) and AFCV4 (7d) is a thermocouple temperature (PV value) attached to the ladle cover of the first ladle heating device and the fourth ladle heating device respectively according to the temperature rising pattern determined under the conditions of 500 ° C or higher (high temperature section). In accordance with the airflow ratio control, it operates according to the calculated flow rate (MV value). 3 shows the thermocouple 202 attached to the ladle cover 205 of the ladle heater 200.

       In addition, the AFCV2 7b is closed because the second ladle heating device is at rest, and the AFCV3 7c is configured to discharge the exhaust gas generated by the third ladle heating device from the first ladle 10a and the second ladle 10b. Since the third ladle (10c) to be heated to dry using the close.

       Since the first ladle 1a and the fourth ladle 10d are being heated by using burner combustion of the ladle heater, the WFCV1 3a and WFCV4 3d on the exhaust gas lines 60a and 60b are closed and the IDF1 is closed. 20a and IDF4 20d are stopped.

       The WSV1 4a and the WSV4 4d are opened to recover the arrangement (exhaust gas) generated in the first ladle 10a and the fourth ladle 10d. By opening the WSV1 4a and the WSV4 4d, the flue gas generated in the first ladle 10a and the fourth ladle 10d is supplied to the third ladle 10c.

       At this time, the flue gas generated in the first ladle 10a and the fourth ladle 10d is branched and delivered to the WFCV5 (3e) and the WFCV6 (3f) through the exhaust gas line 60a. Here, the opening amounts of WFCV5 (3e) and WFCV6 (3f) vary depending on the temperature of the third ladle 10c.

       That is, when drying the third ladle 10c using exhaust gas in a low temperature section, the opening amount of WFCV5 (3e) is decreased and the opening amount of WFCV6 (3f) is increased. In the case where the third ladle 10c is heated using the burner in the high temperature section, the open amount of the WFCV5 (3e) is increased and the open amount of the WFCV6 (3f) is reduced. At this time, the amount of opening of the WFCV5 (3e) and the amount of opening of the WFCV6 (3f) may vary depending on the number of ladle to perform the temperature raising operation and the number of ladle to perform the drying operation.

       CV (9a, 9b, 9c, 9d) of Figure 2 serves to prevent the back flow of the flue gas, and prevents the flue gas discharged from one ladle to be pushed into the neighboring ladle.

       Since the second ladle 10b is at rest, the WSV2 4b and the WFCV2 3b are closed, and the IDF2 20b is stopped.

       Since the third ladle 10c is a ladle heating target ladle using exhaust gas, the exhaust gas is introduced into the third ladle 10c by activating the IDF3 20c, and the WFCV3 3c is the third ladle 10c. According to the temperature rising pattern of the exhaust gas flows into the IDF3 (20c) is controlled.

       At this time, WSV3 (4c) is closed, and the exhaust gas in the ladle is natural exhaust to the gap between the ladle and ladle cover.

       As described above, when the third ladle 10c is heated and dried by using the exhaust gas generated in the first ladle 10a and the fourth ladle 10d in a low temperature section (eg, 500 ° C. or lower), Due to the overall drying of the ladle, the temperature deviation in the low temperature section is smaller than that of the burner. Therefore, it is possible not only to improve the life of the ladle refractory by preventing the sudden rise in temperature in the low temperature section, but also to reduce the energy, thereby contributing to the reduction of the unit by recovering and using the flue gas generated during other ladle heating operation in the high temperature section. .

       3 is a diagram illustrating a ladle heating apparatus 200 and a ladle 10 applied to the present invention, reference numeral 207 denotes a burner body, reference numeral 12 a ladle body, and reference numeral 11 a refractory material.

       4 and 5 are views for explaining a ladle heating apparatus applied to the present invention, Figure 4 (a) is a view showing the shape of the ladle 10 and the ladle cover 205 located on the ladle. 4B shows the ladle cover 205 as viewed from above. 5 (a) is a view for explaining the shape of the exhaust gas inlet formed in the ladle cover 205, Figure 5 (b) and (c) is a view for explaining the flow of the exhaust gas inside the ladle. to be.

       Referring to FIG. 4, the ladle heating apparatus of the present invention includes an exhaust gas suction fan (not shown) for sucking exhaust gas generated from at least one ladle (eg, the first ladle and the second ladle of FIG. 2) during a temperature raising operation. And a plurality of exhaust gas inlets 230 for discharging the exhaust gas sucked by the exhaust gas suction fan IDF into the ladle 10 to be heated up (eg, the third ladle of FIG. 2) and the ladle 10 to be heated up. The ladle cover 205 is provided with a plurality of exhaust gas outlets 220 for discharging the generated exhaust gas to the outside. In addition, a burner body 207 is provided at a central portion of the ladle cover 205 to heat the drying ladle 10 to be heated.

       Four to eight exhaust gas inlets 230 may be formed at the edge of the ladle cover 250, and two to four exhaust gas outlets 220 may be formed around the burner body 207. Each exhaust gas inlet 230 may be connected to the exhaust gas suction fan IDF through the exhaust gas line 60a. Each exhaust gas outlet 220 may be connected to the exhaust gas line 60b, and the burner body 207 may be connected to the gas line 50 and the air line 80.

       At this time, the exhaust gas inlet 230 is drilled to have a predetermined inclination (eg, 30 °) in the counterclockwise or clockwise direction with a predetermined interval in the circumferential direction of the ladle cover 205, as shown in FIG. desirable.

       When the exhaust gas inlet 230 is formed to have a predetermined inclination in a counterclockwise or clockwise direction as in FIG. 5A, as indicated by arrows in FIGS. 5B and 5C, The exhaust gas that is wound around the inner wall of the ladle can efficiently dry up the ladle in a shorter time. Of course, the number and perforated angle of the exhaust gas inlet 230 may vary depending on the size and operating conditions of the ladle.

       6 is a block diagram illustrating the configuration of a ladle heating control device according to the present invention.

       Referring to FIG. 6, the ladle heating control device 100 according to the present invention includes an input unit 110, a main control unit 120, an IDF drive control unit 130, a WFCV control unit 140, a WSV control unit 150, and a GSV. The controller 160, the GFCV controller 170, the AFCV controller 180, the ladle temperature detector 190, and the storage 195 are provided.

       The input unit 110 receives a drying temperature ladle from the user.

       The ladle temperature detector 190 measures the temperature of the ladle. The ladle temperature detector 190 may be the thermocouple 202 illustrated in FIG. 3.

       The IDF driving control unit 130, when the ladle to be heated up temperature is selected through the input unit 110, by using a burner of the ladle heating device to the exhaust gas suction fan (IDF) for sucking the exhaust gas generated from at least one ladle during the heating operation Activate to warm up the ladle.

       The WFCV control unit 140 opens or closes the WFCV (exhaust gas flow control valve) of the ladle heating system of FIG. 2 under the control of the main control unit 120.

       The WSV controller 150 opens or closes the WSV (exhaust gas on / off valve) of the ladle heating system of FIG. 2 under the control of the main controller 120.

       The GSV controller 160 opens or closes the GSV (gas on / off valve) of the ladle heating system of FIG. 2 under the control of the main controller 120.

       The GFCV control unit 170 opens or closes the GSV (gas on / off valve) of the ladle heating system of FIG. 2 under the control of the main controller 120.

       The AFCV controller 180 opens or closes the GSV (gas on / off valve) of the ladle heating system of FIG. 2 under the control of the main controller 120.

       When the dry heating target ladle is selected by the user, the main control unit 120 controls each of the above-described units so that the dry heating target ladle can be warmed up. In addition, when the temperature of the dry heating target ladle satisfies the set threshold temperature, the main control unit 120 stops the dry heating of the dry heating target ladle, and processes the dry heating target ladle by using a burner of the ladle heating apparatus. A detailed control method of the main controller 120 will be described in more detail with reference to FIG. 7.

       The storage unit 195 stores data (eg, critical temperature), algorithms, and the like necessary for carrying out the present invention.

       7 is a flowchart illustrating a ladle heating method using a steelmaking ladle arrangement in the ladle heating control apparatus of the present invention.

       In the description of FIG. 7, as in the description of FIG. 2, a case where four ladles and four ladle heating devices corresponding thereto are disposed will be described as an example. In this case, it is assumed that the first ladle and the fourth ladle are heating up using the burner of the ladle heating apparatus, the second ladle is at rest, and the third ladle is 'dry ladle to be heated'.

       Hereinafter, a description will be given with reference to FIGS. 2 and 7.

       First, the ladle heating control apparatus of the present invention is selected from the user ladle (ie, the third ladle) to be heated up temperature (S100).

       When the dry heating target ladle is selected through the step S100, the ladle heating control device starts the third exhaust gas suction fans IDF3 and 20c connected to the dry heating target ladle, that is, the third ladle. As the third exhaust gas suction fan 20c is activated, the exhaust gas generated in the first ladle 10a and the fourth ladle 10d flows into the third ladle 10c through the exhaust gas line 60a.

       At this time, the ladle heating control device decreases the opening amount of the fifth exhaust gas flow control valves WFCV5 and 3e, and relatively increases the opening amount of the sixth exhaust gas flow control valves WFCV5 and 3f, so that the third exhaust gas suction fan ( 20c) to allow more exhaust gas to be sucked (S110).

       Next, the ladle heating control device closes the third exhaust gas on / off valve WSV3 so that the exhaust gas introduced into the third ladle 10c may be naturally exhausted into the gap between the third ladle 10c and the ladle cover. (S115).

       The ladle heating control device controls the opening amounts of the third exhaust gas flow control valves WFCV3 and 3c according to the temperature rising pattern of the third ladle 10c. A general temperature rise pattern of the ladle is shown in Figure 1, the temperature rise pattern of the ladle may vary depending on the operating environment, the type and properties of the refractory in the ladle.

       Next, the ladle heating control apparatus determines whether the temperature of the third ladle 10c satisfies the set first threshold temperature (S120). In this case, the first critical temperature may be set between 400 ° C. and 500 ° C., which may determine the transition from the low temperature section to the high temperature section in the ladle heating process.

       As a result of the determination in step S125, when the temperature of the third ladle (10c) is greater than or equal to the first critical temperature, the drying rise temperature using the exhaust gas generated from the ladle (first ladle and fourth ladle) during the heating operation is stopped, the burner To heat the third ladle 10c.

       More specifically, the ladle heating control device stops the driving of the third exhaust gas suction fan IDF3 and completely shuts off the third exhaust gas flow air valve WFCV3 to prevent the exhaust gas from flowing into the third ladle 10c. Block (S130).

       Next, the ladle heating controller heats the third ladle 10c using the burner of the ladle heating apparatus. That is, the third gas on / off valve GSV3 is opened, and the opening amounts of the third gas flow control valve GFCV3 and the air flow control valve AFCV are increased (S135).

       Next, the ladle heating control device opens the third exhaust gas on / off valve WSV3 connected to the third ladle 10c. In contrast to the step S110, the opening amount of the fifth exhaust gas flow control valve WFCV5 is increased, and the opening amount of the sixth exhaust gas flow control valves WFCV5 and 3f is decreased (S140).

       After performing step S140, the ladle heating control device controls the air-fuel ratio by adjusting the opening amounts of the third gas flow control valve GFCV3 and the third air flow control valve AFCV3 according to the temperature rising pattern of the third ladle 10c. It performs (S145).

       Finally, the ladle heating control device determines whether the temperature of the third ladle 10c satisfies the second critical temperature, and if the temperature of the third ladle 10c satisfies the second critical temperature, the ladle heating control device determines the gold threshold temperature. The temperature of the third ladle 10c is maintained (S150). In this case, the first critical temperature may be set between 1100 ° C. and 1200 ° C., which may determine the transition from the low temperature section to the high temperature section in the ladle heating process.

       According to the present invention having the above-described configuration, as described above, the third ladle 10c using the exhaust gas generated in the first ladle 10a and the fourth ladle 10d in the low temperature section (eg, 500 ° C. or less). In the case of increasing the drying temperature of the ladle, since the overall drying of the ladle by the exhaust gas, the temperature deviation is lower in the low temperature section than the temperature rising by the burner. Therefore, it is possible not only to improve the life of the ladle refractory by preventing the rapid rise in temperature in the low temperature section, but also to reduce the energy, thereby contributing to the reduction of the unit by recovering and using the exhaust gas generated during the ladle heating operation in the high temperature section.

       As described above, the best embodiment has been disclosed in the drawings and the specification. Although specific terms have been used herein, they are used only for the purpose of describing the present invention and are not used to limit the scope of the present invention as defined in the meaning or claims. Therefore, those skilled in the art will understand that various modifications and equivalent other embodiments are possible from this. Therefore, the true technical protection scope of the present invention will be defined by the technical spirit of the appended claims.

1a, 1b, 1c, 1d: GSV 2a, 2b, 2c, 2d: GFCV
3a, 3b, 3c, 3d, 3e, 3f: WFCV 4a, 4b, 4c, 4d: WSV
7a, 7b, 7c, 7d: AFCV 9a, 9b, 9c, 9d: CV
10,10a, 10b, 10c, 10d: ladle 20a, 20b, 20c, 20d: IDF
40: FDF
50: gas line 55: heat exchanger
60a, 60b: exhaust gas line 80: air line
11: Refractory 12: Ladle body
100: ladle heating control device 110: input unit
120: main control unit 130: IDF drive control unit
140: WFCV control unit 150: WSV control unit
160: GSV control unit 170: GFCV control unit
180: AFCV control unit 190: ladle temperature detection unit
195: storage unit

Claims (16)

Receiving a drying temperature ladle selected from the user;
Sucking dry exhaust gas generated from at least one ladle in a temperature raising operation by using a burner of a ladle heating apparatus to dry-heat the dry heating target ladle;
Measuring the temperature of the dry heating target ladle to determine whether the temperature of the dry heating target ladle satisfies a first critical temperature; And
If the temperature of the drying temperature target ladle satisfies the first critical temperature, stopping the drying temperature rise of the drying temperature target ladle, and heating the drying temperature target ladle using a burner of the ladle heater; Ladle heating method using steel ladle array. The method according to claim 1,
Flue gas generated from the at least one ladle is branched to each of the heat exchanger and the drying temperature target ladle through an exhaust gas line,
The step of sucking up the exhaust gas generated from the at least one ladle during the temperature increase operation by using the burner of the ladle heating apparatus to dry up the drying temperature target ladle,
By controlling the opening amount of the exhaust gas flow control valve for regulating the flow rate of the exhaust gas flowing into the heat exchanger and the exhaust gas flow control valve for regulating the flow rate of the exhaust gas flowing into the drying-heating target ladle, the amount of exhaust gas delivered to the heat exchanger Reducing the amount, and increasing the amount of exhaust gas delivered to the dry-heated ladle to be heated, ladle heating method using a steelmaking ladle arrangement. The method according to claim 1,
The step of sucking up the exhaust gas generated from the at least one ladle during the temperature increase operation by using the burner of the ladle heating apparatus to dry up the drying temperature target ladle,
Periodically measuring the temperature of the ladle to be heated up; And
The ladle using the steel ladle arrangement, characterized in that for controlling the opening amount of the exhaust gas flow control valve for adjusting the flow rate of the exhaust gas flowing into the drying temperature target ladle according to the temperature rising pattern of the drying temperature target ladle. Heating method. The method according to claim 1,
When the temperature of the drying temperature target ladle satisfies a critical temperature, stopping the drying temperature of the drying temperature target ladle,
Stopping driving of the exhaust gas suction fan that sucks the exhaust gas generated from the at least one ladle and discharges the exhaust gas to the drying temperature target ladle; And
And closing an exhaust gas flow rate control valve for controlling a flow rate of the exhaust gas introduced into the exhaust gas suction fan, the ladle heating method using the steelmaking ladle arrangement. The method according to claim 1,
The first critical temperature is between 400 ℃ to 500 ℃, ladle heating method using a steel ladle array. The method according to claim 1,
Heating the ladle to be heated up using the burner of the ladle heating apparatus,
Periodically measuring the temperature of the ladle to be heated up; And
And controlling an opening amount of an exhaust gas flow rate control valve for controlling a flow rate of fuel flowing into the ladle heating apparatus according to the temperature rising pattern of the ladle to be heated up. The method of claim 6,
The step of controlling the opening amount of the exhaust gas flow control valve for controlling the flow rate of the fuel flowing into the ladle heating apparatus according to the temperature rising pattern of the ladle to be heated up,
Determining whether the temperature of the drying temperature target ladle satisfies a second critical temperature; And
And controlling the opening amount of the exhaust gas flow control valve to maintain the temperature of the dry-heating target ladle at the second critical temperature if the temperature of the dry-heating target ladle satisfies the second critical temperature. Ladle heating method using a steelmaking ladle array. The method according to claim 7,
The second critical temperature is between 1100 ℃ to 1200 ℃, ladle heating method using a steelmaking ladle array. An input unit configured to select a drying temperature ladle from a user;
Ladle temperature sensing unit for measuring the temperature of the drying temperature target ladle;
When the ladle to be heated up is selected through the input unit, an IDF for drying and drying the ladle to be heated up by starting a flue gas suction fan that sucks exhaust gas generated from at least one ladle being heated up by using a burner of a ladle heater. A drive control unit; And
It is determined whether the temperature of the dry heating target ladle satisfies a first critical temperature by using the temperature of the dry heating target ladle measured by the ladle temperature sensing unit, and the temperature of the dry heating target ladle is the first critical temperature. When satisfactory, stop the driving of the exhaust gas suction fan to stop the drying temperature of the ladle heating target ladle, the burner of the ladle heating apparatus of the dry rising object ladle is provided with a main control unit for heating the ladle heating target ladle. Ladle heating control apparatus using a steelmaking ladle array. The method according to claim 9,
Flue gas generated from the at least one ladle is branched to each of the heat exchanger and the drying temperature target ladle through an exhaust gas line,
The main fisherman,
By controlling the opening amount of the exhaust gas flow control valve for regulating the flow rate of the exhaust gas flowing into the heat exchanger and the exhaust gas flow control valve for regulating the flow rate of the exhaust gas flowing into the drying-heating target ladle, the amount of exhaust gas delivered to the heat exchanger Ladle heating control device using a steelmaking ladle array, characterized in that the amount is reduced, and the amount of exhaust gas delivered to the drying temperature target ladle. The method according to claim 9,
The ladle temperature sensing unit periodically measures the temperature of the ladle to be heated up,
The main fisherman,
Ladle heating control using the steelmaking ladle arrangement, characterized in that for controlling the opening amount of the exhaust gas flow control valve for adjusting the flow rate of the exhaust gas flowing into the drying temperature target ladle based on the temperature measured by the ladle temperature sensor. Device. The method according to claim 9,
The main fisherman,
Stopping the driving of the exhaust gas suction fan, and closing the exhaust gas flow control valve for adjusting the flow rate of the exhaust gas flowing into the exhaust gas suction fan, ladle heating control device using a steelmaking ladle arrangement. An exhaust gas suction fan for sucking exhaust gas generated from at least one ladle in a temperature raising operation; And
And a ladle cover having a plurality of exhaust gas inlets for discharging the exhaust gas sucked by the exhaust gas suction fan into the ladle to be heated up and drying, and a plurality of exhaust gas outlets for discharging the exhaust gas generated from the ladle to be heated up. Ladle heater. The method according to claim 13,
The exhaust gas inlet is,
Ladle heating apparatus, characterized in that perforated to have a predetermined inclination with a predetermined interval in the circumferential direction of the ladle cover. The method according to claim 14,
The ladle cover,
A ladle heating apparatus, comprising: a burner for heating the drying target ladle to perform a temperature raising operation in a central portion. The method according to claim 13,
The ladle cover,
Ladle heating apparatus characterized in that it comprises a thermocouple for measuring the temperature of the ladle to be heated.

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