A method for drying a thin slab continuous casting crystallizer

Abstract

The invention discloses a method for drying a thin slab continuous casting crystallizer. Drying is performed by using a thin slab continuous casting crystallizer with a drying device. The crystallizer body is divided into several independent cavities by a mounting frame. A first crystallizer copper plate and a second crystallizer copper plate are provided on both sides of the crystallizer body in the length direction, and a first baffle and a second baffle are provided on both sides in the width direction. The bottom of the crystallizer body is composed of the top surface of a guide rod device, and an upper cover is provided on the top of the crystallizer body; a microwave antenna mounting chamber is provided on the top of each cavity, and a side gas collecting chamber is provided on the side of the microwave antenna mounting chamber in communication with the chamber; an intermediate gas collecting chamber in communication with each cavity is provided between the two microwave antenna mounting chambers at the transverse center of the mounting frame, the intermediate gas collecting chamber is in communication with the side gas collecting chamber, a gas channel is provided on the top of the intermediate gas collecting chamber, and an exhaust device in communication with the gas channel is provided on the crystallizer body to discharge the collected gas, so that the drying efficiency is high in a smaller cavity.

Description

Technical Field

[0001] The invention relates to the field of thin slab continuous casting equipment, and in particular to a thin slab continuous casting crystallizer drying method. Background Art

[0002] The thin slab continuous casting mold is a continuous casting device that casts molten steel into thin slabs. The thin slab continuous casting machine needs to be inspected before casting after maintenance or before casting between castings, and the residual steel and slag on the mold grid and surface must be thoroughly cleaned. If necessary, it should be rinsed with produced water. After confirming that the mold corner seam meets the standards, the exhaust fan should be turned on immediately to exhaust moisture. The mold surface should then be polished and dried before being graphite coated.

[0003] When drying the surface of the crystallizer, one or more iodine tungsten lamps are usually placed above the crystallizer to bake it until no moisture remains on the surface of the crystallizer, ensuring that the graphite coating is dry and the inside of the crystallizer is dry and free of moisture. However, using the above method to dry the moisture on the surface of the crystallizer and the graphite coating takes at least 10-15 minutes. The drying time is long and the drying effect is poor, which can easily cause molten steel splashing accidents during casting, resulting in a major safety hazard for people around the pouring operation. In severe cases, it can also cause damage to surrounding equipment, resulting in a sharp increase in the number of injured people. Therefore, in order to reduce operational risks and improve the inherent safety of equipment, a thin slab continuous casting crystallizer with a drying device is urgently needed. Summary of the Invention

[0004] The invention provides a thin slab continuous casting crystallizer drying method, which aims to shorten the drying time of moisture and graphite coating on the surface of the crystallizer, improve the drying effect, and ensure safe and smooth casting production.

[0005] The present invention discloses a method for drying a thin slab continuous casting crystallizer, wherein the thin slab continuous casting crystallizer comprises a crystallizer body, on which a time relay, a main power start switch, a main power stop switch, an emergency stop switch and an audible and visual alarm are provided; the crystallizer body is divided into a plurality of independent cavities by a mounting frame, a first crystallizer copper plate and a second crystallizer copper plate are provided on both sides of the mounting frame in the length direction, a first baffle and a second baffle are provided on both sides in the width direction, and an upper cover is provided on the top of the crystallizer body; a microwave antenna mounting chamber is provided on the top of each cavity, a microwave antenna is provided in the inner cavity of the microwave antenna mounting chamber, a microwave antenna protection cover is provided on the top of the microwave antenna mounting chamber, and a microwave The antenna installation chambers are each provided with a side gas collection chamber in communication therewith; an intermediate gas collection chamber in communication with each cavity is provided between the two microwave antenna installation chambers at the transverse center of the installation frame, the intermediate gas collection chamber is in communication with the side gas collection chambers through a side gas collection channel, and a gas channel is provided at the center of the installation frame; an exhaust device is connected to the crystallizer body, the exhaust device is in communication with the gas channel through a mounting hole, the exhaust device includes a fan impeller, an exhaust cover is provided above the fan impeller, the exhaust cover includes a gas capture cover, a gas collection chamber is provided on the top of the gas capture cover, and a plurality of hole-shaped exhaust ports are provided on the side of the gas collection chamber; the drying method comprises the following steps:

[0006] Step 1: First, turn on the main power switch of the crystallizer body, check that the signals of all sensors and controllers are normal and the corresponding signal display light group indicator lights are on, then start the microwave antenna;

[0007] Step 2: Set the drying time on the time relay of the crystallizer body, control the microwave antenna to transmit microwave signals for drying through the microwave antenna controller, and automatically stop after the set time is reached and send an end signal through the sound and light alarm of the crystallizer body; during the drying process, detect the temperature and humidity in the gas collecting chamber in real time to determine whether the moisture in the crystallizer body is dried. If the drying condition is not good, increase the output power of the microwave antenna and the speed of the fan impeller until drying is completed.

[0008] Preferably, baffle mounting holes are symmetrically provided in the width direction of the mounting frame, and baffle clips adapted to the baffle mounting holes are provided on the first baffle and the second baffle; baffle handles are provided on the outer sides of the first baffle and the second baffle.

[0009] Preferably, the mounting frame is of a special shape, and an isolation vertical plate is provided in the middle of the outer side of the mounting frame, and a plurality of asymmetric first drying chambers and second drying chambers are separated by the isolation vertical plate.

[0010] Preferably, connecting parts extending to the outside of the mounting frame are symmetrically provided at the four corners of the top of the mounting frame, and positioning holes are penetrated through the connecting parts. The first crystallizer copper plate and the second crystallizer copper plate are connected to the mounting frame by positioning pins inserted into the positioning holes.

[0011] Preferably, a lifting hole is provided on the connecting portion near the side of the microwave antenna protection cover.

[0012] Preferably, a water-absorbing cotton installation chamber is provided on the crystallizer body adjacent to the exhaust port, and water-absorbing cotton is horizontally arranged in the water-absorbing cotton installation chamber.

[0013] Preferably, the angles of the special-shaped bracket at the bottom of the mounting frame are: ∠a=101.35°, ∠b=168.65°, ∠c=172.42°, ∠d=82.42°, ∠e=172.41°, ∠f=168.69°, ∠g=16.70°, and ∠h=16.70°.

[0014] Preferably, the intermediate gas collecting chamber is in a mesh shape.

[0015] Preferably, the transmitting antenna direction of the microwave antenna is aligned with the interior of the microwave antenna installation chamber.

[0016] Preferably, the sensor includes a first position sensor provided at all baffle mounting holes, a second position sensor provided at all positioning holes, a first temperature sensor provided on all microwave antenna protective covers, a second temperature sensor and a humidity sensor provided at the top of the gas collecting chamber, and a speed controller for controlling the fan impeller. The first position sensor, the second position sensor and the speed controller are electrically connected to the signal input end of the signal display light group, respectively, the signal output end of the signal display light group is electrically connected to the signal input end of the microwave antenna controller, the first temperature sensor, the second temperature sensor and the humidity sensor are electrically connected to the signal input end of the microwave antenna controller, respectively, and the signal output end of the microwave antenna controller is electrically connected to the microwave antenna.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention utilizes a thin slab continuous casting crystallizer of a specific drying device for drying. The crystallizer is divided into independent small cavities by a mounting frame. The small cavities meet the requirements of low-power microwave heating. Microwaves are reflected when they encounter metal, and the microwave utilization rate is improved in the smaller cavity. According to the characteristics of microwave heating, water molecules oscillate rapidly at a frequency of 2450MHz, and high-speed friction between water molecules generates heat. The generated water vapor is discharged to the outside of the crystallizer through an exhaust hood provided on the crystallizer body. The entire drying operation lasts 3-5 minutes, and the drying efficiency is high.

[0019] 2. The crystallizer drying device of the present invention is provided with a microwave antenna installation chamber and a side gas collection chamber at the top of each cavity. The gas in each small cavity is uniformly collected inside the exhaust hood and then discharged to the outside through the gas collection chamber inside the exhaust hood. The gas is discharged through the exhaust port, and the small amount of condensed water generated at the exhaust port is absorbed by absorbent cotton to prevent the condensed water from flowing into the copper plate inside the crystallizer. In addition, a second temperature sensor and a humidity sensor are provided on the top of the gas collection chamber to detect the temperature and humidity in the gas collection chamber in real time to determine whether the moisture in the crystallizer body has been dried. If the drying condition is not good, the output power of the microwave antenna and the speed of the fan impeller are promptly increased until the water is dried.

[0020] 3. The microwave antenna installation room of the present invention is provided with a microwave antenna protection cover on the top to prevent the microwave antenna from being damaged or polluted by external forces or other pollutants. The exhaust hood is provided with a gas capture cover for easy maintenance. The middle gas collection chamber is mesh-shaped, which not only facilitates the inhalation of gas, but also prevents debris from entering the air duct and causing blockage of the exhaust system.

[0021] 4. The microwave antennas of this invention are independently controlled by microwave antenna controllers. These controllers feature individual start and stop buttons, independent power adjustment buttons, and a display function, allowing for timely adjustment of microwave power output to suit varying field conditions. The mold drying unit is equipped with an emergency stop switch to prevent electrical shock from leakage.

[0022] 5. The transmitting antenna of the microwave antenna of the present invention is directed toward the interior of the microwave antenna installation chamber, which not only prevents the leakage of microwaves from causing radiation to personnel, but also makes better use of the small space of the cavity to dry the moisture on the copper plate of the crystallizer in the shortest time, thereby improving the drying efficiency.

[0023] 6. The exhaust process of this invention is achieved by driving the fan impeller with a drive motor. The suction force generated by the impeller draws gas from the gas channel into the exhaust hood. The gas is captured by the exhaust hood's gas capture cover and then sent to the internal gas collection chamber. Finally, it is discharged through the exhaust port in a targeted manner, preventing the generated high-temperature gas from causing harm to personnel. The output power of the microwave antenna is adjusted according to the actual moisture content and the thickness of the applied graphite layer, thereby increasing the amount of gas discharged. If the exhaust speed needs to be adjusted, the speed of the drive motor is adjusted.

[0024] 7. The mounting frame of the present invention has connecting parts symmetrically provided at the four corners of the top, and positioning holes are provided through the connecting parts. The first crystallizer copper plate and the second crystallizer copper plate are connected to the mounting frame by positioning pins inserted into the positioning holes, and the connection is tight. In addition, a concave lifting hole is provided on the side of the connecting part close to the mounting frame, which is convenient for operators to operate during installation and is not restricted by space during lifting.

[0025] 8. The microwave antenna of the present invention adopts the transmitting antenna of a civilian microwave oven, so there is no need to redesign a high-power transmitting antenna and driving circuit. The production cost is low and the technology is mature. Once a failure occurs, consumables are easy to purchase, which greatly shortens the maintenance time.

[0026] 9. The lower part of the mounting frame of the present invention is a special-shaped bracket, which has a specially designed angle requirement. On the one hand, it ensures that the mounting frame has sufficient strength, and on the other hand, the inclined surface generated can ensure sufficient reflection efficiency, further accelerating the drying efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 An exploded view of a thin slab continuous casting mold according to the present invention;

[0028] Figure 2 Schematic diagram of the structure of the thin slab continuous casting crystallizer of the present invention;

[0029] Figure 3 is an axonometric view of the mounting bracket of the present invention;

[0030] Figure 4 This is a front view of the thin slab continuous casting crystallizer of the present invention;

[0031] Figure 5 for Figure 4 A top view of

[0032] Figure 6 for Figure 4 Left view of;

[0033] Figure 7 This is a front view of the exhaust hood of the present invention;

[0034] Figure 8 for Figure 7 A top view of

[0035] Figure 9 for Figure 7 Left view of;

[0036] Figure 10 is an axonometric view of the exhaust hood of the present invention;

[0037] Figure 11 It is a schematic diagram of the mounting frame structure of the present invention;

[0038] Figure 12 This is a schematic diagram of the interlocking operation of the thin slab continuous casting crystallizer drying method of the present invention;

[0039] In the figure: 1-mounting frame; 101-baffle mounting hole; 102-special-shaped bracket; 103-first drying chamber; 104-isolation vertical plate; 105-second drying chamber; 106-positioning hole; 107-lifting hole; 108-edge gas collection chamber; 109-edge gas collection channel; 1010-middle gas collection chamber; 1011-mounting hole; 1012-gas channel; 1013-absorbent cotton installation chamber; 1014-microwave antenna installation chamber; 2-first crystallizer copper plate; 3-second crystallizer copper plate; 30 1-Locate pin; 4-First baffle; 5-Second baffle; 501-Baffle handle; 502-Baffle latch; 6-Upper cover; 7-Microwave antenna; 8-Microwave antenna protective cover; 9-Absorbent cotton; 10-Fan impeller; 11-Drive motor; 12-Exhaust hood; 1201-Gas collecting chamber; 1202-Exhaust port; 1203-Gas capture cover; 13-First sensor; 14-Second sensor; 15-Microwave antenna cable; 16-First temperature sensor; 17-Second temperature sensor; 18-Humidity sensor; 20-First microwave antenna controller; 21-Second microwave antenna controller; 22-Third microwave antenna controller; 23-Fourth microwave antenna controller; 24-Speed ​​controller; 25-Signal display light group; 26-Time relay; 27-Main power stop switch; 28-Main power start switch; 29-Emergency stop switch; 30-Sound and light alarm. DETAILED DESCRIPTION

[0040] The present invention will be further described below with reference to the accompanying drawings:

[0041] like Figure 1-12As shown, the present invention is a method for drying a thin slab continuous casting crystallizer, wherein the thin slab continuous casting crystallizer includes a crystallizer body, on which a time relay 26, a main power start switch 28, a main power stop switch 27, an emergency stop switch 29 and an audible and visual alarm 30 are provided. The crystallizer body is divided into two independent cavities by a mounting frame 1, and a first crystallizer copper plate 2 and a second crystallizer copper plate 3 are provided on both sides of the mounting frame 1 in the length direction, and a first baffle 4 and a second baffle 5 (the first baffle 4 and the second baffle 5 can also be crystallizer copper plates) are provided on both sides in the width direction. The bottom of the crystallizer body is composed of the top surface of the ingot rod device (existing technology, not shown in the figure), and the top of the crystallizer body is provided with an upper cover 6. The four corners of the top of the mounting frame 1 are symmetrically provided with connecting parts extending to the outside of the mounting frame 1, and positioning holes 106 are penetrated on the connecting parts. The first crystallizer copper plate 2 and the second crystallizer copper plate 3 are connected to the mounting frame 1 by positioning pins 301 inserted into the positioning holes 106; the positioning holes 106 are connected to the second position sensor 14, and baffle mounting holes 101 are symmetrically provided on both sides of the width direction of the mounting frame 1. The first baffle 4 and the second baffle 5 are provided with baffle bayonet 502 adapted to the baffle mounting holes 101; the outside of the first baffle 4 and the second baffle 5 are provided with baffle handles 501, and the baffle mounting The mounting holes 101 are connected to the first position sensor 13, and a microwave antenna mounting chamber 1014 is provided on the top of each cavity. A microwave antenna 7 is provided in the inner cavity of the microwave antenna mounting chamber 1014, and a microwave antenna protective cover 8 is provided on the top of the microwave antenna mounting chamber 1014. The transmitting antenna direction of the microwave antenna 7 is aligned with the interior of the microwave antenna mounting chamber 1014, and a first temperature sensor 16 is provided on the microwave antenna protective cover 8. The signal input end of the microwave antenna 7 and the first temperature sensor 16 are electrically connected through a microwave antenna cable 15. A starting device is provided on the side of the connection portion close to the microwave antenna protective cover 8. Hanging hole 107, the side of microwave antenna installation chamber 1014 is provided with a side gas collection chamber 108 communicating therewith; a mesh intermediate gas collection chamber 1010 communicating with each cavity between the two microwave antenna installation chambers 1014 at the horizontal center of the installation frame 1, the intermediate gas collection chamber 1010 is connected to the side gas collection chamber 108 through the side gas collection channel 109, and a gas channel 1012 is provided at the center of the installation frame 1; an exhaust device is connected to the crystallizer body, and the exhaust device is connected to the gas channel 1012 through the installation hole 1011, and the exhaust device includes a gas outlet connected to the side gas outlet 1012 by a driving motor 11 drives the fan impeller 10, and the fan impeller 10 is controlled by the speed controller 24; an exhaust hood 12 is provided above the fan impeller 10, and the exhaust hood 12 includes a gas capture cover 1203, and a gas collecting chamber 1201 is provided on the top of the gas capture cover 1203, and a plurality of hole-shaped exhaust ports 1202 are provided on the side of the gas collecting chamber 1201, and a water-absorbing cotton installation chamber 1013 is provided on the crystallizer body adjacent to the exhaust port 1202, and water-absorbing cotton 9 is horizontally arranged in the water-absorbing cotton installation chamber 1013, and a second temperature sensor 17 and a humidity sensor 18 are provided on the top of the gas collecting chamber 1201.Among them, the first position sensor 13, the second position sensor 14 and the speed controller 24 are respectively electrically connected to the signal input end of the signal display light group 25, the signal output end of the signal display light group 25 is electrically connected to the signal input end of the microwave antenna controller (the microwave controller includes the first microwave antenna controller 20, the second microwave antenna controller 21, the third microwave antenna controller 22 and the fourth microwave antenna controller 23), the first temperature sensor 16, the second temperature sensor 17 and the humidity sensor 18 are respectively electrically connected to the signal input end of the microwave antenna controller, and the signal output end of the microwave antenna controller is electrically connected to the microwave antenna 7.

[0042] Specifically, the mounting frame 1 is shaped, with an isolation plate 104 positioned in the middle of its exterior, separating two asymmetrical first drying chambers 103 and two second drying chambers 105. The angles of the shaped bracket 102 at the bottom of the mounting frame 1 are: ∠a = 101.35°, ∠b = 168.65°, ∠c = 172.42°, ∠d = 82.42°, ∠e = 172.41°, ∠f = 168.69°, ∠g = 16.70°, and ∠h = 16.70°. The maximum width H of the mounting frame 1 when unfolded is the maximum width that the isolation plate 104 can extend within the mold body.

[0043] The method for drying using the thin slab continuous casting crystallizer comprises the following steps:

[0044] Step 1: Start the main power start switch 28, detect that the signals of the first position sensor 13 and the second position sensor 14 both reach the signal display light group 25, and the corresponding display light is on. When the signal of the speed controller 24 reaches the signal display light group 25, the corresponding display light is on. When the above conditions are met at the same time, start the microwave antenna 7;

[0045] Step 2: Set the drying time to 3 minutes on the time relay 26, and control the microwave antenna 7 to emit a microwave signal through the microwave antenna controller to start drying. The drying process automatically stops after the set time is reached, and an end signal is sent through the sound and light alarm 30 to indicate that the drying is complete. During the drying process, the second temperature sensor 17 detects the temperature in the gas collecting chamber 1201 in real time, and the humidity sensor 18 detects the humidity in the gas collecting chamber 1201 in real time. The detection shows that the moisture in the crystallizer body has been completely dried. To further ensure safe production and prevent insufficient drying of the moisture on the crystallizer surface and the graphite coating, which may cause molten steel splashing during casting, moisture test paper can be used to check whether the gas ejected from the exhaust port 1202 has reached the dryness required by the process conditions. Upon inspection, the result is normal, indicating that the crystallizer copper plate is completely dry and can proceed with subsequent production.

Claims

1. A method for drying a thin slab continuous casting mold, characterized in that: The thin slab continuous casting crystallizer comprises a crystallizer body, on which a time relay (26), a main power start switch (28), a main power stop switch (27), an emergency stop switch (29) and an audible and visual alarm (30) are provided; the crystallizer body is divided into a plurality of independent cavities by a mounting frame (1); the mounting frame (1) is irregularly shaped; a first crystallizer copper plate (2) and a second crystallizer copper plate (3) are provided on both sides of the mounting frame (1) in the longitudinal direction, a first baffle (4) and a second baffle (5) are provided on both sides in the width direction, and an upper cover (6) is provided on the top of the crystallizer body; a microwave antenna mounting chamber (1014) is provided on the top of each cavity, a microwave antenna (7) is provided in the inner cavity of the microwave antenna mounting chamber (1014), a microwave antenna protection cover (8) is provided on the top of the microwave antenna mounting chamber (1014), and the sides of the microwave antenna mounting chamber (1014) are provided with a A side gas collection chamber (108); an intermediate gas collection chamber (1010) communicating with each cavity is provided between the two microwave antenna installation chambers (1014) at the transverse center of the installation frame (1); the intermediate gas collection chamber (1010) and the side gas collection chamber (108) are communicated through a side gas collection channel (109); a gas channel (1012) is provided at the center of the installation frame (1); an exhaust device is connected to the crystallizer body, the exhaust device is communicated with the gas channel (1012) through the installation hole (1011), the exhaust device includes a fan impeller (10), an exhaust cover (12) is provided above the fan impeller (10), the exhaust cover (12) includes a gas capture cover (1203), a gas collection chamber (1201) is provided on the top of the gas capture cover (1203), and a plurality of hole-shaped exhaust ports (1202) are provided on the side of the gas collection chamber (1201); The drying method comprises the following steps: Step 1: First, start the main power start switch (28) of the crystallizer body, check that the signals of all sensors and controllers are normal and the corresponding signal display light group (25) lights up, and then start the microwave antenna (7); Step 2: Set the drying time on the time relay (26) of the crystallizer body, control the microwave antenna (7) to emit microwave signals for drying through the microwave antenna controller, and automatically stop after the set time is reached and send an end signal through the sound and light alarm (30) of the crystallizer body; during the drying process, detect the temperature and humidity in the gas collecting chamber (1201) in real time to determine whether the moisture in the crystallizer body is dried. If the drying condition is not good, increase the output power of the microwave antenna (7) and the speed of the fan impeller (10) until drying is completed; The sensors include first position sensors (13) provided at all baffle mounting holes (101), second position sensors (14) provided at all positioning holes (106), first temperature sensors (16) provided on all microwave antenna protection covers (8), second temperature sensors (17) and humidity sensors (18) provided at the top of the gas collecting chamber (1201), and a speed controller (24) for controlling the fan impeller (10). The first position sensor (13), the second position sensor (14), and the speed controller (24) are respectively electrically connected to the signal input end of the signal display light group (25).

2. The method for drying a thin slab continuous casting mold according to claim 1, wherein: The mounting frame (1) is symmetrically provided with baffle mounting holes (101) in the width direction, and the first baffle (4) and the second baffle (5) are provided with baffle clips (502) adapted to the baffle mounting holes (101); and baffle handles (501) are provided on the outsides of the first baffle (4) and the second baffle (5).

3. The method for drying a thin slab continuous casting mold according to claim 2, wherein: An isolation vertical plate (104) is provided in the middle of the outer side of the mounting frame (1), and a plurality of asymmetric first drying chambers (103) and second drying chambers (105) are separated by the isolation vertical plate (104).

4. A thin slab continuous casting mold drying method according to claim 3, characterized in that: Connecting portions extending to the outside of the mounting frame (1) are symmetrically provided at the four corners of the top of the mounting frame (1), and positioning holes (106) are provided through the connecting portions. The first crystallizer copper plate (2) and the second crystallizer copper plate (3) are connected to the mounting frame (1) via positioning pins (301) inserted into the positioning holes (106).

5. The method for drying a thin slab continuous casting mold according to claim 4, wherein: A lifting hole (107) is provided on the connecting portion on one side close to the microwave antenna protection cover (8).

6. The method for drying a thin slab continuous casting mold according to claim 1, wherein: A water-absorbing cotton installation chamber (1013) is provided on the crystallizer body adjacent to the exhaust port (1202), and water-absorbing cotton (9) is horizontally arranged in the water-absorbing cotton installation chamber (1013).

7. The method for drying a thin slab continuous casting mold according to claim 1, wherein: The intermediate gas collecting chamber (1010) is in a mesh shape.

8. The method for drying a thin slab continuous casting mold according to claim 1, wherein: The transmitting antenna direction of the microwave antenna (7) is aligned with the interior of the microwave antenna installation chamber (1014).

9. The method for drying a thin slab continuous casting mold according to claim 1, wherein: The signal output end of the signal display light group (25) is electrically connected to the signal input end of the microwave antenna controller, the first temperature sensor (16), the second temperature sensor (17) and the humidity sensor (18) are electrically connected to the signal input end of the microwave antenna controller, and the signal output end of the microwave antenna controller is electrically connected to the microwave antenna (7).

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