KR20110077622A - Microwave dryer for rh-ob snokel - Google Patents

Abstract

PURPOSE: A drying apparatus of an RH-OB snorkel using microwaves is provided to remarkably reduce drying time by maintaining the vacuum state of a chamber and rotating a rotary plate. CONSTITUTION: A drying apparatus of an RH-OB snorkel using microwaves comprises a chamber(200), a microwave oscillator(220), a heater(222), a vacuum pump(230), a vacuum valve(232), and an exhaust valve(234). A snorkel is inserted into the chamber. The microwave oscillator generates microwaves and dries the snorkel. The heater supplies heat to the inside the chamber. The vacuum pump and the vacuum valve are formed along a pipe formed in one side of the chamber and vacuumize the inside the chamber. The exhaust valve is formed in the pipe and exhausts vapor to the outside.

Description

RH-Ok immersion pipe drying apparatus using microwaves {MICROWAVE DRYER FOR RH-OB SNOKEL}

The present invention relates to a drying apparatus for a deposition pipe that is exchanged and detached to an RH-OB device, which is a steelmaking and steelmaking facility. More specifically, the drying time is shortened by drying a deposition pipe composed of amorphous refractory materials using microwaves. It relates to a technique for reducing the.

In general, in an integrated steel mill, C, N ₂ , O ₂ , S, P contained in the molten steel 112 of the ladle 110 by vacuuming the inside of the apparatus as one of the secondary refining facilities, as shown in FIG. 1. RH-OB facility 100 is provided to improve the quality of molten steel 112 and to produce high value-added products by degassing an element acting as an impurity in other molten steel 112 such as H and H using a partial pressure difference. have. Such RH-OB facility 100 is one of the degassing apparatus, the oxygen blowing into the molten steel 112 in the ladle 110 (O ₂ Blowing) is called RH, RH-OB, RH-TOB, RH-KTB, RH-POSB and the like, but the name is hereinafter referred to as RH-OB.

The RH-OB facility 100 locates the ladle 110 at the bottom thereof, deposits a plurality of deposition pipes 120 from the upper side toward the molten steel 112 in the ladle 110, and the RH-OB facility. After forming the vacuum pressure to 0 Torr in the interior of 100, and then supplying argon gas (Ar Gas) through the argon injection hole 122 formed in one side of the deposition pipe 120, the corresponding deposition pipe 120 is molten steel The 112 acts as a rising pipe to which the molten steel is raised so that the molten steel 112 rises from the ladle 110 into the RH-OB facility 100.

And, the molten steel 112 is the molten steel 112 is lowered back from the RH-OB equipment 100 to the ladle 110 through the other sedimentation pipe (downfall pipe) 120, the molten steel 112 The flow is continuous and in this process impurities in the molten steel are gasified and removed.

In order to perform degassing in the RH-OB facility 100, the ladle 110 containing the molten steel 112 is deposited to provide a passage through the vortex of the molten steel 112. As illustrated in FIG. 2, the snorkel 120 employs a structure of an orthogonal refractory brick 130, and an exterior is formed of a castable refractory 135 made of various materials due to its structural characteristics. It is common to do it. That is, a structure of using the refractory brick 130 on the inner side and the irregular refractory 135 on the outer side of the metal shell 140. After placing the pedestal 121 in the chamber 200 and then placing a sedimentation tube thereon and supplying flame from the burner 123 at the bottom, the hot air is generated through the exhaust port 150 through the upward direction of the arrow. It was dried in such a way that it is discharged to the outside.

However, in the case of the amorphous refractory 135 containing water, a drying time in the past was required for about one week, and recently, one or two days of drying time. The reason why it takes a long time is the irregularity that has been applied to the outside of the sedimentation pipe 120 according to the increase of operating temperature, increase of use time, increase of vortex speed of molten steel 112 and high vacuum degree according to increase of production of high value-added steel and special steel. This is even more so because an abrupt repair of the RH-OB facility 100 occurs due to damage such as initial cracking and dropping of the refractory 135.

As such, when the drying method is dried in the conventional drying method, the durability of the immersion pipe 120 may be lowered, and problems such as an increase in raw material costs and a decrease in operating efficiency have been raised. When the gas burner (COG & LNG) method is used when drying the amorphous refractory 135 as in the past, not only thermal expansion is inevitably occurring but also the strength of the refractory decreases due to the addition of an anti-expanding agent for suppressing it. . In addition, there was a need for an active countermeasure against high calorific value by-product gas (COG) oversupply, which has been used as the main dry fuel to avoid environmental pollution caused by incomplete combustion of fuel and large CO ₂ emission process.

The present invention has been made to solve the above problems, while maintaining the chamber in a vacuum to reduce the drying time by irradiating microwaves to the deposition tube containing a large amount of amorphous refractory refractory to reduce the drying time and is equipped with a rotating plate uniform Drying is possible, and by supplying hot air to efficiently discharge the moisture discharged from the inside of the immersion pipe, it improves the characteristics such as corrosion resistance and abrasion resistance of the immersion pipe, improves the productivity of the refining process, and reduces the energy required during drying. The purpose is to provide a device that can.

The present invention is a cylindrical chamber in which the immersion tube is charged; A microwave oscillator connected through a waveguide formed on an outer circumferential surface of the chamber to generate microwaves to dry the deposition tube; A heater formed at one side of the lower end of the chamber to supply heat to the inside of the chamber; A vacuum pump and a vacuum valve formed along a pipe formed on one side of the upper end of the chamber to vacuum the inside of the chamber; It provides a deposition tube drying apparatus using a microwave, characterized in that consisting of a discharge valve for discharging the steam generated formed in the pipe to the outside.

In addition, the chamber of the present invention is a stirrer for circulating the internal air for uniform drying of the immersion tube on the top, a rotating plate on which the immersion tube is seated and rotated, and formed at the bottom of the swivel plate to detect moisture changes It is characterized by consisting of a load cell for predicting the drying time.

In addition, the microwave oscillator of the present invention is a magnetron for generating ultra-high frequency, a launcher for connecting the high-frequency power generated from the magnetron to the isolator, and transmits the high-frequency power from the launcher to the tuner and sends the reflected power to the dummy load It consists of an isolator, a dummy rod connected to the isolator to protect the magnetron, a tuner which receives the ultra-high frequency from the isolator and regulates and connects it to the chamber, and a wave guide connecting the high-frequency power from the tuner to the chamber. It is characterized by.

Furthermore, the waveguide of the present invention is characterized by being formed as a partition wall so that microwaves do not leak to the outside.

The present invention can be reduced while drying the chamber by rotating the rotating plate while maintaining the vacuum in the microwave using a microwave, it can greatly reduce the drying time of the amorphous refractory, excellent thermal shock resistance applied to the immersion pipe in the molten steel of the RH equipment, and deposition The durability of the pipe is greatly improved, thereby improving productivity in the RH installation process and reducing maintenance costs.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

3 is a configuration diagram of a microwave drying apparatus according to the present invention, a chamber 200 in which a deposition tube 201 is loaded and dried, and a rotating plate 202 installed inside the chamber 200 to enable rotation. And a load cell 204 positioned at the lower portion of the rotating plate 202 to predict moisture change, and a microwave oscillator 220 formed on an outer circumferential surface of the chamber 200 to generate microwaves. The stirrer 210 is installed on the upper portion of the chamber 200 to mix air to enable uniform drying, and the vacuum pump 230 and the vacuum valve 232 connected to the chamber 200 to form a vacuum. ) And a discharge valve 234 for discharging moisture generated by drying the deposition pipe 201 to the outside is formed between the vacuum pump 230 and the chamber 200.

Hereinafter, the device of the present invention will be described in more detail.

First, the microwave oscillator 220, which is formed on the outer circumferential surface of the chamber 200 and generates microwaves, includes a magnetron that generates ultra-high frequency of 2.45 GHz or 915 MHz, and the ultra-high frequency power generated by the magnetron on a waveguide transmission line. By connecting the launcher to the isolator (Launcher), and the ultra-high frequency power from the launcher to the tuner (Tuner) to send to the chamber 200, by sending the reflected power to the dummy load (Dumy Load) Isolator which plays a role of protecting magnetron, dummy rod which protects microwave oscillator by injecting reflected power from the isolator into water and dissipating it into heat, and ultra-high frequency is introduced into the chamber 200 receiving ultra-high frequency from the isolator A tuner that is adjusted and matched to the tuner, The wave guide connecting the ultra-high frequency power from the chamber 200 is a main configuration. The microwave oscillator 220 is installed in the waveguide 206 of the chamber 200. The waveguide 206 may be a partition wall to prevent the leakage of microwaves.

In addition, the vacuum system for preventing thermal expansion is installed on the upper side of the chamber 200 is composed of a vacuum pump 230 and a vacuum valve 232, the exhaust system for effectively discharging the evaporated water in the vacuum pump 230 It consists of the discharge valve 234 formed on the piping by which air moves, and the heater 230 which is responsible for a hot air supply is provided.

The inside of the chamber 200 is rotated at a constant speed to rotate the rotating disk on which the deposition tube 201 is mounted so that a more uniform microwave is irradiated at this time, the rotation speed is about 0.1 ~ 10rpm. In addition, in consideration of the length of the vertical portion, a plurality of microwave oscillators 220 may be installed at upper, middle, and lower levels. In addition, the temperature uniformity in the up and down and circumferential directions of the immersion pipe 201 can be secured to suppress the thermal expansion phenomenon.

Hereinafter will be described the operation of the present invention.

First, the cover 208 of the chamber 200 is opened and the deposition tube 201 is charged at the upper side of the chamber 200. When the immersion pipe 201 is seated on the rotating plate 202, the vacuum pump 230 is operated to discharge the air in the chamber 200 to the outside. At this time, the vacuum pump 230 is operated by a motor 240 located on one side thereof. When the inside of the chamber 200 becomes a vacuum pressure, the heater 203 is operated to heat the inside of the chamber 200 and at the same time the micro oscillator 220 is operated to generate ultra-high frequency power to dry the deposition tube 201. Let's do it. At this time, the stirrer 210 installed in the upper part of the chamber is operated for uniform drying. In addition, by drying the rotating plate 202 while rotating, the generated steam is discharged to the outside, which is discharged to the outside through the discharge valve 234 is installed on the pipe in which the vacuum valve 232 is installed. When the drying continues to the appropriate drying state, the drying operation of the immersion tube 201 is stopped, which detects the moisture change in the chamber 200 in the load cell 204 to predict the drying time, thereby stopping the operation.

1 is a conceptual view of the operation of the RH-OB,

2 is a schematic view of a conventional gas drying apparatus,

3 is a configuration diagram of a microwave drying apparatus according to the present invention,

4 is a configuration diagram of a vacuum apparatus and a rotating apparatus according to the present invention.

* Description of the symbols for the main parts of the drawings *

100: RH equipment 110: ladle

112: molten steel 114: oxygen lance

120: deposition pipe 121: pedestal

122: argon hole 123: burner

130: orthogonal refractory brick 135: amorphous refractory

140: shell 150: exhaust vent

200: chamber 202: rotating plate

203: caster 204: load cell

210: stirrer 220: microwave oscillator

222: heater 230: vacuum pump

232: vacuum valve 234: discharge valve

240: motor

Claims (4)

A cylindrical chamber into which the immersion tube is charged; A microwave oscillator connected through a waveguide formed on an outer circumferential surface of the chamber to generate microwaves to dry the deposition tube; A heater formed at one side of the lower end of the chamber to supply heat to the inside of the chamber; A vacuum pump and a vacuum valve formed along a pipe formed on one side of the upper end of the chamber to vacuum the inside of the chamber; Microwave immersion tube drying apparatus, characterized in that consisting of a discharge valve for discharging the generated steam generated in the pipe to the outside. The method of claim 1, The chamber has a stirrer for circulating internal air for uniform drying of the immersion tube on the upper part, a rotating plate on which the immersion tube is seated and rotated, and a lower part of the rotating plate to detect a change in moisture to predict a drying time. Immersion tube drying apparatus using a microwave, characterized in that consisting of a load cell for. The method of claim 1, The microwave oscillator is a magnetron for generating ultra-high frequency, a launcher for connecting the ultra-high frequency power generated from the magnetron to the isolator, an isolator for sending the ultra-high frequency power from the launcher to the tuner and transmitting the reflected power to the dummy load, and A dummy rod connected to an isolator to protect the magnetron, a tuner for adjusting and connecting the ultra-high frequency received from the isolator to the chamber, and a wave guide for connecting the high-frequency power from the tuner to the chamber. Submerged tube drying apparatus using microwave. The method of claim 1, The waveguide is a deposition tube drying apparatus using a microwave, characterized in that formed as a partition wall so that microwaves do not leak to the outside.

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