KR102236621B1 - Steel plate continuous heat treatment system to establish heat treatment conditions - Google Patents

Abstract

The present invention is a continuous heat treatment furnace comprising a preheating zone (200), a heating zone (300), a crack zone (400), and a cooling zone (500). According to the present invention, a steel plate continuous heat treatment system for establishing heat treatment conditions has the effect of burning unburned powder generated in the preheating zone and the heating zone.

Description

Steel plate continuous heat treatment system to establish heat treatment conditions

The present invention relates to a continuous heat treatment system for steel sheet for establishing heat treatment conditions, and more particularly, to establish heat treatment conditions for establishing optimal heat treatment conditions by experimenting with heating conditions and temperature rise conditions for continuous heat treatment of steel sheets. It relates to a continuous heat treatment system for steel sheets.

In general, a continuous heat treatment furnace is used to increase or decrease the temperature of the steel sheet according to physical and chemical properties in order to remove and reduce the internal stress of the steel sheet.

The continuous heat treatment includes a preheating zone for preheating a steel sheet, a heating zone for removing surface impurities and rapidly heating, a soak zone for recrystallization and grain growth in a reducing atmosphere, and a cooling zone for slow cooling.

In particular, the continuous heat treatment furnace has a high energy consumption density, so energy consumption reduction, productivity improvement, and high-efficiency high-performance with flexibility in various types of heat treatment are the key to securing market competitiveness.It is a technology that can secure the temperature and atmosphere control performance of the preheating zone, heating zone, and crack zone. Securing is essential.

However, in the related art, since it is not possible to accurately control the heating condition and the temperature increase condition according to the type and characteristic of the steel sheet, a large amount of unburned powder is generated and there is a problem of lowering the production quality.

In particular, conventionally, due to the reduction in combustion efficiency and difficulty in combustion control, there has been a problem in that scale generation of the steel sheet and heat loss due to supply of excess air may occur.

Japanese Unexamined Patent Application Publication No. Hei 08-013044 (January 16, 1996) Korean Patent Registration No. 10-0421128 (2004.03.04) Korean Patent Publication No. 10-2006-0029460 (2006.04.06) Japanese Unexamined Patent Publication No. 2012-021688 (2012.02.02) Korean Patent Publication No. 10-2013-0134254 (2013.12.10) Korean Patent Registration No. 10-1360609 (2014.02.11) Korean Patent Registration No. 10-1480895 (2015.01.12) Korean Patent Publication No. 10-2015-0008544 (2015.01.23)

Therefore, the present invention has been devised to solve the conventional problem as described above,

An object of the present invention is to provide a steel sheet continuous heat treatment system for establishing heat treatment conditions capable of establishing optimal heat treatment conditions by testing the heating conditions and temperature rise conditions of a preheating zone, a heating zone, and a soak zone.

In addition, another object of the present invention is to provide a steel sheet continuous heat treatment system for establishing heat treatment conditions capable of burning unburned powder generated in a preheating zone.

Steel sheet continuous heat treatment system 100 for establishing the present invention heat treatment conditions for achieving the above object,

A preheating zone 200 for preheating the steel sheet A to pass through; A heating zone 300 for heating the steel sheet A passing through the preheating zone 200; A crack zone 400 for recrystallization and grain growth of the steel sheet A passing through the heating zone 300 in a reducing atmosphere; In the continuous heat treatment furnace consisting of; a cooling zone 500 for slow cooling the steel sheet (A) passing through the crack zone 400,

A fuel supply unit to form an air supply unit 110 to supply air to the burners 330 and 370 of the heating table 300, and to supply fuel to the burners 330 and 370 of the heating table 300 to mix and combust with air. By forming (120), heating and burning the heating zone 300 by adjusting the equivalent ratio of the air supply amount of the air supply part 110 and the fuel supply amount of the fuel supply part 120, but the unburned powder in the preheating zone 200 By passing the high-temperature exhaust gas discharged to the outside of the combustion furnace, the cold air supplied from the outside through the air supply unit 110 is heat-exchanged with hot air, so that the unburned powder can be burned by supplying it to the inside of the preheating zone 200. A temperature capable of controlling the temperature of the exhaust gas discharged from the preheater 200 to the heat exchanger 130 by forming a heat exchanger 130 and being formed between the preheater 200 and the heat exchanger 130 It characterized in that it is provided with the adjustment unit 140.

Here, the air control valve 111 is formed to adjust the amount of air supplied between the air supply unit 110 and the heating table 300, and the amount of fuel supplied between the fuel supply unit 120 and the heating table 300 can be adjusted. A fuel control valve 121 is formed so that the heating condition is tested by adjusting the equivalent ratio of the air supply amount and the fuel supply amount, and the amount of hot air supply between the heat exchanger 130 and the preheater 200 can be controlled. A first high-temperature air control valve 131 is formed, and the air that has passed through the heat exchanger 130 is supplied to the burner 420 of the soaking zone 400 to burn unburned powder, and the heat exchanger 130 A second high temperature air control valve 132 is formed between the and the soaking zone 400 so as to control the heating condition and the temperature increase condition while adjusting the amount of hot air supplied.

In particular, a suction fan 150 is formed to be connected to the heat exchanger 130 to suck unburned exhaust gas generated inside the preheater 200 and discharge it to the outside, and the heat exchanger 130 and It is characterized in that a discharge unit 133 is formed to discharge the heat-exchanged air by connection to the outside.

In addition, temperature measuring members (21,31) formed to measure the temperature of the steel plate (A) on one side of the heating zone 300 and the soaking zone 400; And a concentration measuring member 22 formed at one side of the heating table 300 to measure the internal gas concentration.

On the other hand, the preheating table 200 has a body 210 having a passage 230 so that the steel plate (A) can pass therein; Refractory material 220 formed on the inside of the body 210; An air supply unit 240 supplying air to the inside of the passage 230; An exhaust gas discharge unit 250 formed on one front side of the body 210 to discharge exhaust gas to the outside; It characterized in that it consists of; an opening 260 formed in front of the body 210 to open and close the passage 230.

In addition, the heating table 300 includes a lower body 310 formed to move up and down; A first blocking film 310a formed in a vertical direction under both sides of the lower body 310; A storage unit 310b for securing watertightness by inducing the first blocking film 310a to be immersed in the liquid stored therein; First driving means (320) for moving the lower body (310) up and down; A plurality of burners 330 formed on the lower body 310; An upper body 340 formed to move up and down; A second blocking film (340a) formed in a vertical direction under both sides of the upper body (340); A storage unit 340b for securing water tightness by inducing the second blocking film 340a to be immersed in the liquid stored therein; A second driving means 350 for moving the upper body 340 up and down; It characterized in that it consists of; a plurality of burners 370 formed in the lower portion of the upper body 340.

And the cooling table 500 is a body 510; An induction roller 520 formed on the inner side of the body 510 and formed to rotate in contact with the surface of the steel plate (A); An injection member 530 formed in the lower portion of the body 510 and spraying gas to the surface of the steel plate A passing through; A blocking part 540 formed under the body 510 to prevent the inflow of foreign substances; A refractory material 550 formed to pass through the steel plate A on the inside of the body 510; An induction roller 580 that is located under the blocking portion 540 and stores liquid therein so that the lower portion of the body 510 is immersed in the liquid, but guides the direction so that the steel plate A can pass therethrough. ) Having a tank 570; characterized in that it consists of.

The present invention has the effect of establishing an optimal heat treatment condition by experimenting with the heating conditions and temperature rise conditions of the preheating zone, heating zone, and soaking zone.

In addition, the present invention has the effect of being able to burn unburned powder generated in the preheating zone and the heating zone.

1 is a conceptual diagram showing the configuration of a steel sheet continuous heat treatment system for establishing the heat treatment conditions of the present invention.
Figure 2 is a configuration diagram showing the configuration of a continuous steel sheet heat treatment system for establishing the heat treatment conditions of the present invention.

As described above, the configuration of the present invention will be described in detail with reference to the accompanying drawings.

1 is a conceptual diagram showing the configuration of a steel sheet continuous heat treatment system for establishing the heat treatment conditions of the present invention, FIG. 2 is a configuration diagram showing the configuration of a steel sheet continuous heat treatment system for establishing the heat treatment conditions of the present invention will be.

The present invention is a preheating table 200 for preheating the steel sheet (A) passing through; A heating zone 300 for heating the steel sheet A passing through the preheating zone 200; A crack zone 400 for recrystallization and grain growth of the steel sheet A passing through the heating zone 300 in a reducing atmosphere; In the continuous heat treatment furnace consisting of; a cooling zone 500 for slow cooling the steel sheet (A) passing through the crack zone 400,

A fuel supply unit to form an air supply unit 110 to supply air to the burners 330 and 370 of the heating table 300, and to supply fuel to the burners 330 and 370 of the heating table 300 to mix and combust with air. By forming (120), heating and burning the heating zone 300 by adjusting the equivalent ratio of the air supply amount of the air supply part 110 and the fuel supply amount of the fuel supply part 120, but the unburned powder in the preheating zone 200 By passing the high-temperature exhaust gas discharged to the outside of the combustion furnace, the cold air supplied from the outside through the air supply unit 110 is heat-exchanged with hot air, so that the unburned powder can be burned by supplying it to the inside of the preheating zone 200. A temperature capable of controlling the temperature of the exhaust gas discharged from the preheater 200 to the heat exchanger 130 by forming a heat exchanger 130 and being formed between the preheater 200 and the heat exchanger 130 The adjustment unit 140 is provided.

In particular, the preheating zone 200 is a section in which preheating is performed to heat the steel sheet A to a target set temperature, and the heating zone 300 is a section in which the temperature of the steel sheet A reaches a target set temperature in earnest. , The soaking zone 400 is a section for uniformly setting the temperature of the steel sheet A passing through the heating zone 300, and the cooling zone 500 is a section for cooling the steel sheet A passing through.

Here, a heating operation may be performed by including burners 330 and 370 at one side of the preheating zone 200, the heating zone 300, and the soaking zone 400.

In addition, by forming the exhaust gas discharge unit 250 on the upper portion of the preheater 200, the high-temperature exhaust gas generated in the preheater 200 may be discharged to the outside.

In addition, the air supply unit 110 and the fuel supply unit 120 supply air and fuel to the burners 330 and 370 of the heating table 300 to perform a combustion process.

Here, an air control valve 111 is formed to adjust the amount of air supplied between the air supply unit 110 and the heating table 300, and the amount of fuel supplied between the fuel supply unit 120 and the heating table 300 can be adjusted. The fuel control valve 121 is formed so that the heating condition can be tested by adjusting the equivalent ratio of the air supply amount and the fuel supply amount.

At this time, the equivalent ratio of the air supply amount and the fuel supply amount may be adjusted by an operator at different equivalent ratios according to the type and standard of the steel plate and experimented to establish an optimum combustion condition of the heating table 300.

In particular, the heat exchanger 130 increases the temperature of the external air supplied through the air supply unit 110 by using the high-temperature exhaust gas discharged from the preheater 200 and supplies it to the interior of the preheater 200. Play a role.

That is, by maintaining the internal temperature of the preheating zone 200 and the heating zone 300, it is possible to maintain a high-temperature reducing atmosphere.

Meanwhile, a temperature controller 140 capable of controlling the exhaust temperature may be formed by supplying external air to the high-temperature exhaust gas discharged from the preheater 200 to the outside by combustion of unburned powder.

The temperature controller 140 uses a blower fan to suck in external air and mix it with the high-temperature exhaust gas passing through the heat exchanger 130.

In particular, the temperature control unit 140 minimizes air pollution that occurs when the high-temperature exhaust gas is directly discharged into the atmosphere, and prevents damage and thermal deformation of the heat exchanger 130 due to the high-temperature exhaust gas. Hereinafter, it performs the function of controlling the temperature of the exhaust gas.

In addition, the high-temperature air that has passed through the heat exchanger 130 may be supplied to the interior of the preheater 200 to burn unburned powder and suppress the generation of scale.

That is, when cold air is supplied into the preheating table 200, the scale generation of the steel plate A can be promoted, so that the low-temperature air supplied through the air supply unit 110 is provided to prevent such a problem. After passing through the heat exchanger 130 to heat exchange with hot air, it is supplied to the inside of the preheater 200 to suppress the generation of scale.

In this case, a first high-temperature air control valve 131 may be formed between the heat exchanger 130 and the preheating table 200 to control the amount of high-temperature air supplied.

In addition, the air that has passed through the heat exchanger 130 is supplied to the inside of the soaking zone 400 to combust unburned powder, and the amount of high-temperature air supplied between the heat exchanger 130 and the soaking zone 400 is A second high temperature air control valve 132 may be formed to control the heating condition and the temperature increase condition.

And a suction fan 150 connected to the heat exchanger 130 to suck unburned exhaust gas generated inside the preheater 200 and discharge it to the outside.

In addition, a discharge unit 133 configured to be connected to the heat exchanger 130 to discharge the heat-exchanged air to the outside; including, a failure of the heat exchanger 130 and the exhaust gas may be induced during the maintenance process. .

In addition, temperature measuring members (21,31) formed to measure the temperature of the steel plate (A) on one side of the heating zone 300 and the soaking zone 400; The first high temperature air control valve 131 and the second high temperature air control valve 132 including; a concentration measuring member 22 formed at one side of the heating table 300 to measure the internal gas concentration Thus, the flow rate that can be supplied can be adjusted.

In this case, the temperature measuring members 21 and 31 and the concentration measuring member 22 may use sensors having various shapes and configurations.

On the other hand, the preheating table 200 has a body 210 having a passage 230 so that the steel plate (A) can pass therein; Refractory material 220 formed on the inside of the body 210; An air supply unit 240 supplying air to the inside of the passage 230; An exhaust gas discharge unit 250 formed on one front side of the body 210 to discharge exhaust gas to the outside; It is formed in front of the body 210 to open and close the passage 230 to open and close the opening 260; consists of.

In particular, the passage 230 not only induces the steel plate A to pass through, but also heat generated when the heating table 300 is operated while being connected to the passage 380 of the heating table 300 is transmitted through the passage 230 As it flows into the inside of the body 210 through ), the surface of the steel plate A may be preheated without requiring a separate heat source.

In addition, the refractory material 220 may be formed of a refractory material such as castable to secure heat resistance of the body 210.

In addition, the air supply unit 240 resupplies separate air to combustion oxides generated by mixing and burning air and fuel (LNG) as a heat source of the preheater 200 to induce natural combustion. ) Can be used as a heat source.

On the other hand, the opening 260 is a range in which the combustion gas inside the body 210 is discharged to the outside by adjusting the opening and closing range of the passage 230 or outside air is introduced into the body 210 Can be adjusted.

In this case, the opening and closing opening 260 may be formed in the form of an opening and closing door that can be moved up and down by a screw coupling method.

In addition, the heating zone 300 serves to heat the surface of the steel plate A passing through the preheating zone 200 to a target temperature required for an experiment.

The heating table 300 includes a lower body 310 formed to move up and down; A first blocking film 310a formed in a vertical direction under both sides of the lower body 310; A storage unit 310b for securing watertightness by inducing the first blocking film 310a to be immersed in the liquid stored therein; First driving means (320) for moving the lower body (310) up and down; A plurality of burners 330 formed on the lower body 310; An upper body 340 formed to move up and down; A second blocking film (340a) formed in a vertical direction under both sides of the upper body (340); A storage unit 340b for securing water tightness by inducing the second blocking film 340a to be immersed in the liquid stored therein; A second driving means 350 for moving the upper body 340 up and down; Consists of; a plurality of burners 370 formed in the lower portion of the upper body 340.

In particular, while the lower body 310 and the upper body 340 move up and down, the burners 330 and 370 move closer to or away from the surface of the steel plate A to control the temperature.

Here, the first driving means 320 and the second driving means 350 receive the driving force of a motor such as a cylinder or screw shaft 350b, a screw jack, etc., and use the rotation shaft 350a to the lower body 310 and The upper body 340 can be smoothly moved up and down.

In this case, a support 360 may be formed on an upper portion of the upper body 340 so that the plurality of burners 370 are simultaneously moved up and down so as not to be distorted.

In addition, the first blocking film 341a and the second blocking film 340a are immersed in a liquid such as water in the storage units 310b and 340b, and the high-temperature combustion gas generated inside the heating table 300 is It plays a role of blocking discharge to the outside.

In particular, the burners 330 and 370 increase the temperature of the steel plate A by using heat generated by mixing and burning air and LNG therein.

In addition, the cooling table 500 includes a body 510; An induction roller 520 formed on the inner side of the body 510 and formed to rotate in contact with the surface of the steel plate (A); An injection member 530 formed on the inner lower part of the body 510 and spraying gas to the surface of the steel plate A passing through; A blocking part 540 formed under the body 510 to prevent the inflow of foreign substances; Refractory material 550 formed so that the steel plate (A) can pass through the inside of the body 510; An induction roller 580 that is located under the blocking part 540 and stores liquid therein so that the lower part of the body 510 is immersed in the liquid, but guides the direction so that the steel plate A can pass therethrough. ) Comprising a tank 570; consists of.

Here, a support roller 560 in front of the body 510 supports the lower surface of the steel plate A passing through the heating table 300 so that it can move smoothly.

In particular, the guide rollers 520 and 580 guide the direction of the steel plate A passing through, as well as assist in maintaining a constant tension.

In addition, the injection member 530 may improve cooling efficiency by injecting a high-pressure gas to the surface of the steel plate A, as well as remove remaining foreign substances.

At this time, the blocking part 540 is formed in a shape that gradually decreases in width from the top to the bottom in order to prevent foreign substances from flowing into the body 510 from the outside.

In addition, the lower portion of the body 510 is provided to be immersed in the liquid stored in the tank 570 so that the high-temperature combustion gas generated inside the heating table 300 passes through the body 510 and passes through the steel plate ( A), as well as preventing the phenomenon of being discharged to the outside while moving together with the heating zone 300 and the soak zone 400 to maintain a constant pressure inside the support.

Although the embodiments of the present invention have been described in detail as described above, the scope of the present invention is not limited thereto, and it is natural that the scope of the present invention is included in the scope of the present invention to a configuration that is substantially equivalent to the embodiment of the present invention. Do.

21: temperature measuring member 22: concentration measuring member
31: temperature measuring member
100: steel sheet continuous heat treatment system for establishing the heat treatment conditions of the present invention
110: air supply part 111: air control valve
120: fuel supply unit 121: fuel control valve
130: heat exchanger 131: first high temperature air control valve
132: second high temperature air control valve 133: discharge unit
140: temperature control unit 150: suction fan
200: preheating table 210: body
220: refractory material 230: passage
240: air supply unit 250: exhaust gas discharge unit
260: opening
300: heating table 310: lower body
310a: first blocking film 310b: storage unit
320: first driving means 330: burner
340: upper body 340a: second blocking membrane
340b: storage unit 350: second driving means
360: support 370: burner
400: crack zone 410: body
420: burner
500: cooling table 510: body
520: guide roller 530: injection member
540: blocking portion 550: refractory
560: support roller 570: tank
580: guide roller
A: steel plate

Claims (7)

A preheating zone 200 for preheating the steel sheet A to pass through; A heating zone 300 for heating the steel sheet A passing through the preheating zone 200; A soaking zone 400 for recrystallization and grain growth of the steel sheet A passing through the heating zone 300 in a reducing atmosphere; In the continuous heat treatment furnace consisting of; a cooling zone 500 for slow cooling the steel sheet (A) passing through the crack zone 400,
A fuel supply unit to form an air supply unit 110 to supply air to the burners 330 and 370 of the heating table 300, and to supply fuel to the burners 330 and 370 of the heating table 300 to mix and combust with air. By forming (120), heating and burning the heating zone 300 by adjusting the equivalent ratio of the air supply amount of the air supply part 110 and the fuel supply amount of the fuel supply part 120, but the unburned powder in the preheating zone 200 By passing the high-temperature exhaust gas discharged to the outside of the combustion furnace, the cold air supplied from the outside through the air supply unit 110 is heat-exchanged with hot air, so that the unburned powder can be burned by supplying it to the inside of the preheating zone 200. A temperature capable of controlling the temperature of exhaust gas discharged from the preheater 200 to the heat exchanger 130 by forming a heat exchanger 130 and being formed between the preheater 200 and the heat exchanger 130 A steel sheet continuous heat treatment system for establishing heat treatment conditions, characterized in that the control unit 140 is provided. The method according to claim 1, wherein the air control valve 111 is formed between the air supply unit 110 and the heating table 300 to adjust the amount of air supplied, and the fuel is provided between the fuel supply unit 120 and the heating table 300. A fuel control valve 121 is formed to control the supply amount, and the heating condition is tested by adjusting the equivalent ratio of the air supply amount and the fuel supply amount, and the amount of hot air supplied between the heat exchanger 130 and the preheater 200 A first high temperature air control valve 131 is formed to control the heat exchanger 130, and the air that has passed through the heat exchanger 130 is supplied to the burner 420 of the soaking zone 400 to burn unburned powder, and the heat exchanger Establish a heat treatment condition characterized in that the second high temperature air control valve 132 is formed to control the heating condition and the temperature increase condition while adjusting the amount of hot air supplied between the group 130 and the soaking zone 400 Steel plate continuous heat treatment system for use. The method according to claim 1, wherein a suction fan 150 is formed to be connected to the heat exchanger 130 to suck unburned exhaust gas generated inside the preheater 200 and discharge it to the outside, and the heat exchanger A continuous heat treatment system for steel sheet for establishing heat treatment conditions, characterized in that a discharge part 133 is formed in connection with 130 to discharge heat-exchanged air to the outside. The method according to claim 1, Temperature measuring member (21, 31) formed to measure the temperature of the steel plate (A) on one side of the heating zone (300) and the soak zone (400); A concentration measuring member 22 formed on one side of the heating table 300 so as to measure the internal gas concentration. The method according to claim 1, wherein the preheater 200 includes a body 210 having a passage 230 to allow the steel plate A to pass therethrough; Refractory material 220 formed on the inside of the body 210; An air supply unit 240 supplying air to the inside of the passage 230; An exhaust gas discharge unit 250 formed on one front side of the body 210 to discharge exhaust gas to the outside; An opening and closing opening 260 formed in front of the body 210 to open and close the passage 230; a continuous heat treatment system for steel sheet for establishing heat treatment conditions. The method according to claim 1, wherein the heating table 300 includes a lower body 310 formed to move up and down; A first blocking film 310a formed in a vertical direction under both sides of the lower body 310; A storage unit 310b for securing watertightness by inducing the first blocking film 310a to be immersed in the liquid stored therein; First driving means (320) for moving the lower body (310) up and down; A plurality of burners 330 formed on the lower body 310; An upper body 340 formed to move up and down; A second blocking film (340a) formed in a vertical direction under both sides of the upper body (340); A storage unit 340b for securing water tightness by inducing the second blocking film 340a to be immersed in the liquid stored therein; A second driving means 350 for moving the upper body 340 up and down; A steel plate continuous heat treatment system for establishing heat treatment conditions, comprising: a plurality of burners 370 formed under the upper body 340. The method according to claim 1, wherein the cooling table 500 is a body (510); An induction roller 520 formed on the inner side of the body 510 and formed to rotate in contact with the surface of the steel plate (A); An injection member 530 formed on the inner lower part of the body 510 and spraying gas to the surface of the steel plate A passing through; A blocking part 540 formed under the body 510 to prevent the inflow of foreign substances; Refractory material 550 formed so that the steel plate (A) can pass through the inside of the body 510; An induction roller 580 that is located under the blocking part 540 and stores liquid therein so that the lower part of the body 510 is immersed in the liquid, but guides the direction so that the steel plate A can pass therethrough. ) Having a tank 570; a steel plate continuous heat treatment system for establishing heat treatment conditions, characterized in that it consists of.

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