KR101247590B1 - Pre-heating appartus of mud gun nozzle tip - Google Patents

Abstract

PURPOSE: A pre-heating device of a mud gun nozzle tip is provided to shorten preheating time by improving preheating efficiency, to reduce fuel consumption, and to reduce work load which is consumed for preheating. CONSTITUTION: A pre-heating device of a mud gun nozzle tip comprises a chamber(40), a supporting stand of the nozzle tip, a heating part, a cooling part, a thermometer, and a control unit(90). The supporting stand of the nozzle tip is installed at the inner lower side of the chamber and supports the nozzle tip. The heating part heats the nozzle tip. The cooling part cools the nozzle tip which is heated by supplying cooling water after heating by the heating part ends. The thermometer measures the temperature of the nozzle tip. The control unit controls the operation of the cooling part and the heating part to repeat the heating and the cooling with a constant cycle. The control unit controls the intensity of heat using the heating part based on the measured temperature in the thermometer for heating the nozzle tip to the predetermined temperature when heating. The chamber comprises a stylobate(41) in which the nozzle tip is installed at the upper side; and a cover(42) which is detachably installed on the stylobate. [Reference numerals] (90) Control unit; (AA) Cooling water

Description

Mud Gun Nozzle Tip Preheater {PRE-HEATING APPARTUS OF MUD GUN NOZZLE TIP}

The present invention relates to a mud gun nozzle tip preheating apparatus, and more particularly, to a preheating apparatus of a mud gun nozzle tip for improving the heat resistance strength of the nozzle tip to prevent the mud gun nozzle tip loss when closing the outlet.

The blast furnace is the main facility of the steel mill, and the blast furnace operation charges the iron ore used as the raw material for steelmaking and the coke used as fuel from the top of the blast furnace in layers, and the hot air heated in the hot stove from the bottom of the blast furnace through the tuyere. Blowing coke to reduce and dissolve iron ore. Iron ore causes heat exchange and reduction with high-temperature Co gas generated by the combustion of coke, and is dissolved and melted into molten iron and slag at the bottom of the blast furnace. Become segregated

Melt accumulated in the hot water flow part is discharged to the outside of the blast furnace by opening the exit port at the bottom of the blast furnace, in general, the large blast furnace is provided with two to four exit ports are alternately used to take out the continuous work.

When the discharge of the melt in the blast furnace by the above-described process is completed, the operation to close the exit port in preparation for the next departure operation.

1 is a view showing a situation of closing the exit using a mud gun, Figure 2 is an exploded perspective view of the mud gun nozzle and nozzle tip, Figure 3 is a view showing a nozzle tip preheating process according to the prior art.

1 to 3, the melt produced in the blast furnace 5 is discharged to the large bath 17 outside the blast furnace 5 through the outlet 10 installed in the lower part of the blast furnace 5, and the discharge is completed. At the point of time, the starting port 10 is closed by the mud gun 20.

The mud gun 20 is rotated on the large tap road 17 in order to close the tap opening 10 through which the hot melt is discharged, and is advanced to be in line with the tap opening surface 11 to be joined to the tap opening surface 11. After that, the mud material 28, which is self-filling, is pushed to the piston 29 to close the tap hole 10.

Since the melt ejected through the outlet 10 of the blast furnace 5 has a high temperature of more than 1500 ° C., the nozzle tip 22 is disposed at the tip of the mud gun 2 to protect the tip of the mud gun 20 and prevent the melt from flowing out. It is used in combination.

The nozzle tip 22 is mainly manufactured using cast iron which is excellent in castability, easy to cut, and relatively inexpensive for materials or melting, and can be easily manufactured even in a small factory. However, since the cast iron has a relatively high coefficient of thermal expansion and thermal deformation, the nozzle tip 22 is frequently melted by hot melt and hot air of more than 1500 ° C ejected from the tap opening 10. When the nozzle tip 22 is molten, the mud material 28 flows out of the molten portion and the tap hole 11 is dropped.

Therefore, for subsequent drawing operations, the mud gun 20 should be retracted to retreat, regenerate the tap opening surface 11, replace the damaged nozzle tip 22, and remove the waste mud material leaked out. However, these operations are causing tremendous workloads due to unheated molten iron and slag and poor environments exposed to hot gases.

Conventionally, in order to prevent melting of the nozzle tip when closing the outlet, the torch 30 is used to preheat the nozzle tip 22 coupled to the tip of the mud gun 20 to improve the heat resistance strength of the nozzle tip 22. have.

However, during the preheating of the nozzle tip 22, the mud material 28 filled in the mud gun 20 is overheated, and thus the tar component of the mud material 28 is lost, thereby causing the viscosity of the mud material 28. There was a problem that it is impossible to close the exit opening as it is dropped into the liquid state.

In addition, in order to have sufficient heat resistance to prevent the nozzle tip from being melted during closing of the exit port, the nozzle tip 22 needs to be heated at a predetermined temperature, for example, at a temperature of about 1300 degrees for a predetermined time, but the operator manually maintains the temperature. If the temperature is too high to control the temperature properly, the nozzle tip 22 is melted and cannot be used. If the temperature is low, the heat resistance of the nozzle tip 22 is not sufficiently secured. Therefore, the problem that the nozzle tip 22 is melted when the outlet is closed is generated again. In addition, the preheating efficiency is lowered due to the influence of the air in the atmosphere, and because the nozzle tips 22 are processed by hand one by one, the preheating takes a long time, and the work load consumed for preheating is large.

The present invention has been made to solve the above problems, to provide a mud gun nozzle tip preheating apparatus suitable for improving the heat resistance strength of the nozzle tip so that the mud gun nozzle tip is prevented when closing the exit opening, .

Another object of the present invention is to provide a mud gun nozzle tip preheating apparatus which can improve preheating efficiency, shorten preheating time, reduce fuel consumption, and reduce workload consumed in preheating.

According to one aspect of the present invention, a mud gun nozzle tip preheating apparatus includes a chamber, a nozzle tip support installed at a lower side inside the chamber and supporting a nozzle tip, a heating part for heating the nozzle tip, and the heating part. After the heating is completed, the cooling unit for supplying the cooling water to cool the heated nozzle tip, the thermometer measuring the temperature of the nozzle tip, and controls the operation of the heating unit and the cooling unit so that the heating, cooling is repeated at regular intervals, It includes a control unit for controlling the intensity of heat by the heating unit based on the temperature measured by the thermometer so that the nozzle tip is heated to a predetermined temperature.

The chamber may include a base installed at the top of the nozzle tip support and a cover installed to be separated from the base.

The base may further include a fork insertion hole into which the fork of the forklift is fitted, and the cover includes an inner confirmation window provided to view the inside of the chamber and a fork handle installed at the upper side of the cover to which the fork of the forklift is fitted. It may further include.

The nozzle tip support may be composed of a plurality of bar-shaped structures arranged in parallel at regular intervals such that both ends of the nozzle tip are covered.

The heating unit is connected to the chamber and a fuel gas inlet pipe for providing a flow path for the fuel gas from the fuel gas storage tank into the chamber, a gas valve installed on the fuel gas inlet pipe, and the chamber And an ignition plug that is installed at the high-pressure discharge to ignite the fuel gas by generating an electric spark, and an ignition device that provides power to the ignition plug. The gas valve and the opening degree and the operation of the ignition device are By the controller. The fuel gas inlet pipe may be connected to a lower side of the side surface of the chamber positioned on an extension direction of the nozzle tip support.

The heating unit is connected to the chamber and provides an air inlet pipe for providing a flow path for the air containing oxygen supplied from the air compressor into the chamber, an air supply valve installed on the air inlet pipe, and connected to the chamber And an air discharge pipe that provides a flow path so that the air inside the chamber is discharged to the outside, and an exhaust valve installed on the air discharge pipe, and the air supply valve and the exhaust valve are opened and closed by the controller.

On the other hand, the heating unit may be composed of a temperature controller for controlling the temperature of the electric heating wire and the electric heating wire embedded in the inner wall of the chamber and the nozzle tip support, the temperature control of the temperature controller is made by the controller.

The cooling unit is connected to the chamber to provide a cooling water inlet pipe for providing a flow path for cooling water supplied from the cooling water storage tank into the chamber, and waste water used to cool the nozzle tip connected to the chamber to the outside of the chamber. It may include a drain pipe for providing a flow path to be discharged, a water supply valve installed on the cooling water inlet pipe and a drain valve installed on the drain pipe, the opening and closing of the water supply valve and the drain valve is made by the controller.

According to the present invention, since the nozzle tip is automatically preheated to an appropriate heating temperature, the heat resistance strength of the nozzle tip is sufficiently secured to prevent melt of the nozzle tip when closing the outlet. Therefore, the work load is reduced because it is not necessary to perform the nozzle tip melt and consequently the discharge of the mud material, the nozzle tip exchange operation due to the dropping of the starting surface, the removal of the spilled mud material and the recovery of the starting surface.

In addition, since the preheating operation is performed in an enclosed space and is not affected by the wind in the air, the preheating efficiency is improved and fuel consumption is reduced. In addition, several nozzle tips can be preheated at the same time, saving time and workload.

1 is a view showing a situation of closing the exit using the mud gun.
2 is an exploded perspective view of the mud gun nozzle and the nozzle tip.
3 is a view showing a nozzle tip preheating process according to the prior art.
4 is a perspective view of a mud gun nozzle tip preheating apparatus according to an embodiment of the present invention.
5 is a cross-sectional view taken along the line II ′ of FIG. 4.
6 is a cross-sectional view taken along the line II-II 'of FIG. 4.
7 is a nozzle tip loading state diagram of the mud gun nozzle tip preheating apparatus according to an embodiment of the present invention.
8 is a state diagram during the heating process of the mud gun nozzle tip preheating apparatus according to an embodiment of the present invention.
9 is a state diagram during the cooling process of the mud gun nozzle tip preheating apparatus according to an embodiment of the present invention.

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

Embodiments related to the present invention are basically based on receiving a nozzle tip therein and configured to improve the heat resistance strength of the nozzle tip while repeating heating and cooling.

4 is a view showing a mud gun nozzle tip preheating apparatus according to an embodiment of the present invention, Figure 5 is a cross-sectional view taken along the line II 'of Figure 4, Figure 6 is a line II-II' of FIG. According to the cross-sectional view.

The chamber 40 is provided to provide a space in which the nozzle tip is cooled and heated, and the chamber 40 includes a base end 41 and a cover 42 installed to be detachable on the base end 41.

A fork insertion hole 41A into which a fork of a forklift truck is fitted is formed at the side of the base end 41 so that the fork of the forklift can be easily carried thereon. The nozzle tip support 50 is installed. The nozzle tip support 50 is composed of bar-shaped structures 51, 52, and 53 arranged at parallel intervals so as to span both ends of the nozzle tip.

The cover 42 is separated from the base end 41 when the nozzle tip is loaded so that the nozzle tip can be loaded onto the nozzle tip support 50, and is coupled and heated on the base end 41 after the loading of the nozzle tip is completed. And space for cooling. A fork handle 43 into which the fork of the forklift truck is fitted is installed on the upper side of the cover 42 so that the fork of the forklift can be easily carried, and the front part of the cover 42 is visually exposed to the chamber 40 by an operator. An internal confirmation window 44 made of a transparent material is installed so as to check the internal situation.

The inner wall of the chamber 40 and the surface of the nozzle tip support 50 are made of an amorphous refractory resistant to high heat and water so as not to be damaged in the process of heating and cooling the nozzle tip.

Although, in the present embodiment, the chamber 40 is described only in the case consisting of the base end 41 and the cover 42, the shape of the chamber 40 is not particularly limited, the nozzle tip is accessible and the nozzle tip inside Any form is acceptable as long as it is acceptable.

A fuel gas inlet pipe 45 is connected to the chamber 40 to supply fuel gas required for nozzle tip heating to the chamber 40, and an opening degree is controlled by the controller 90 on the fuel gas inlet pipe 45. A controlled gas valve 45A is installed to adjust the amount of fuel gas introduced into the chamber 40 through the fuel gas inlet pipe 45. In order for the nozzle tip to be efficiently heated, the fuel gas inlet pipe 45 is preferably connected to the lower side of the side wall of the chamber 40 located on the extending direction of the nozzle tip support 50.

In this embodiment, the gas COG generated by burning the coke in a blast furnace (not shown) is used as the fuel gas. Although not shown, in order to use COG generated in the blast furnace, a main gas pipe for drawing the gas generated in the blast furnace to the fuel gas storage tank is hypothesized, and the fuel gas storage tank and the fuel gas inlet pipe 45 are It is connected by the pipe 61. On the pipe 61 is provided a regulator (not shown) that serves to properly adjust the flow rate and pressure of the gas, and supplies the fuel gas regulated at a constant flow rate and pressure to the fuel gas inlet pipe (45).

An air inlet pipe 46 is connected to the chamber 40 to supply oxygen for combustion of fuel gas to the chamber 40, and the opening and closing is controlled by the controller 90 on the air inlet pipe 46. The air supply valve 46A is provided.

Atmospheric air may be used as the oxygen supply source. Although not shown, the air compressor compresses air in the atmosphere, and the air compressed through the air compressor is provided to the air inlet pipe 46 through the pipe 62. Due to the difference between the pressure of the air compressed by the air compressor to the high pressure and the pressure of the air in the chamber 40, the air discharged from the air compressor flows along the pipe 65 to the air inlet pipe 46, the air inlet When the air supply valve 46A installed on the pipe 46 is opened, air is supplied into the chamber 40.

And, in order to discharge the air supplied through the air inlet pipe 46, the fuel gas supplied through the fuel gas inlet pipe 45 and the gas generated during the combustion of the fuel gas, the upper side of the chamber 40 in the air discharge pipe ( 47) is connected. The exhaust valve 47A is installed on the air discharge pipe 47 to control the opening and closing by the controller 90. When the exhaust valve 47A is opened, the air inside the chamber 40 is discharged to the outside.

On the other hand, the cooling water inlet pipe 48 is connected to the upper side of the chamber 40 to cool the heated nozzle tip. The coolant inlet pipe 48 is connected to a coolant storage tank (not shown) through a pipe 63. On the cooling water inlet pipe 48 is provided a water supply valve 48A, which is controlled to be opened and closed by the control unit 90, so that the cooling water supplied from the cooling water storage tank when the water supply valve 48A is opened through the cooling water inlet pipe 48 It is supplied to the chamber 40.

In addition, a drain pipe 49 is connected to the lower side of the chamber 40 to discharge the wastewater used for cooling the nozzle tip to the outside of the chamber 40. The drain valve 49A is installed on the drain pipe 49 to control the opening and closing by the control unit 90, and when the drain valve 49A is opened, the waste water inside the chamber 40 is opened through the drain pipe 49. It will be discharged to the outside.

An ignition plug 70 is installed inside the chamber 40 to ignite the fuel gas, and an ignition device 71 is provided outside the chamber 40 to supply power to the ignition plug 70. The spark plug 70 penetrates the outer wall of the chamber 40 and is fixed to one end of the connection pipe 72 introduced into the chamber 40. The other end of the connecting tube 72, which is opposite to one end of the connecting tube 72 to which the spark plug 70 is connected, is connected to the ignition device 71 outside the chamber 40, and the spark plug inside the connecting tube 72. An electric wire 73 for electrically connecting the 70 and the ignition device 71 is provided. The ignition device 71 is operated by the control of the control unit 90 to supply power to the spark plug 70 through the wires 73, the spark plug 70 using the power applied from the ignition device 71 It generates high voltage discharge around 100,000V to generate ignition spark.

In order to measure the temperature of the nozzle tip, a thermometer 80 is inserted into the chamber 40 through the outer wall of the chamber 40. The thermometer 80 preferably uses an infrared ray (Infrared Ray) thermometer that measures the temperature in a non-contact manner. In addition, a bimetal thermometer, a mercury thermometer, a gas thermometer, etc. can also be used.

The control unit 90 is electrically connected to the gas valve 45A, the air supply valve 46A, the exhaust valve 47A, the water supply valve 48A, the exhaust valve 49A, and the ignition device 71, respectively, so that heating and cooling is performed. The opening and closing of the valves 45A, 46A, 47A, 48A, and 49A and the operation of the ignition device 71 are controlled to be repeated at regular intervals. In addition, the controller 90 stores a preset temperature during heating, and the controller 90 opens the gas valve 45A based on the temperature measured by the thermometer 80 such that the nozzle tip is heated to a preset heating temperature. Control the degree. The functions of the controller 90 may be implemented in software. More specifically, it can be realized by executing a computer program corresponding to these functions.

The heating temperature set value may be used by sampling the heating temperature in the test run when a nozzle tip is obtained which is not injured by the thermal stress applied at the time of closing the outlet by commissioning the apparatus of the present invention while varying the heating temperature. The heating temperature setpoint is not immutable and should be reset if the operating conditions have changed, for example if the melt and gas temperature at the exit port is changed or the material of the nozzle tip is changed.

Although the above-described embodiment described with reference to the drawings refers only to the case consisting of components for burning the fuel gas to heat the nozzle tip, the present invention is not limited thereto. For example, the nozzle tip may be heated by embedding an electric heating wire in the inner wall of the chamber 40 and the nozzle tip support 50, and using a temperature controller that adjusts the temperature of the electric heating wire according to the control of the controller 90. In this case, the configuration of the fuel gas inlet pipe 45, the air inlet pipe 46, the air discharge pipe 47, the spark plug 70, and the ignition device 71 is omitted.

Referring to Figures 7 to 9 the operation of the mud gun nozzle tip preheating apparatus according to the present invention configured as described above are as follows.

Figure 7 is a nozzle tip loading state diagram of the mud gun nozzle tip preheating apparatus according to an embodiment of the present invention, Figure 8 is a state diagram during the heating operation of the mud gun nozzle tip preheating apparatus according to an embodiment of the present invention, Figure 9 State diagram during the cooling operation of the mud gun nozzle tip preheating apparatus according to an embodiment of the present invention.

First, as shown in FIG. 7, the pipes 61, 62, and 63 are separated from the fuel gas inlet pipe 45, the air inlet pipe 46, and the coolant inlet pipe 48, and the base end of the chamber 40. The nozzle tip 10 is loaded onto the nozzle tip support 50 in a state in which the 41 and the cover 42 are separated.

Subsequently, as shown in FIG. 8, the cover 42 is covered on the base end 41 to seal the inside of the chamber 40, and the fuel gas inlet pipe 45, the air inlet pipe 46, and the coolant inlet pipe 48 are closed. After connecting the piping (61, 62, 63) to the control unit 90, the preheating start signal is input to the control unit 90 by the user in the control unit 90 so that the heating and cooling is repeated at regular intervals in accordance with a predetermined program Control components.

Looking at the operation of the device by the control of the control unit 90 in detail, first the air containing oxygen to the chamber 40 through the air inlet pipe 46 by opening the air supply valve 46A and the exhaust valve 47A In the supplied state, a small amount of the gas valve 45A is opened to supply fuel gas through the fuel gas pipe 45. As described above, when the ignition device 71 is operated by supplying fuel gas and oxygen containing fuel necessary for combustion of the fuel gas to the chamber 40, power is applied to the ignition plug 70. As the spark plug is generated in the spark plug 70, ignition occurs and the nozzle tip begins to heat. At this time, the nozzle tip 10 is sufficiently heated while controlling the opening degree of the gas valve 45A based on the temperature measured by the thermometer 80 so that the nozzle tip 10 is heated to a predetermined heating temperature.

Subsequently, when the heating is completed, as shown in FIG. 9, the gas valve 45A and the air supply valve 46A are closed, and the water supply valve 48A is opened to supply the cooling water to the chamber 40 through the cooling water supply pipe 48. To rapidly cool the heated nozzle tip 10. Next, the water supply valve 48A is closed to stop the supply of cooling water, the drain valve 49A is opened to discharge all the cooling water in the chamber 40 to the outside through the drain pipe 49, and when the draining is completed, the bass valve Close 49A.

Then, the heating and cooling are repeated several times, for example, two to three times at regular intervals to complete the nozzle tip preheating operation.

When the nozzle tip preheating is completed through the above-described process, the pipes 61, 62, and 63 are separated from the gas inlet pipe 45, the air inlet pipe 46, and the coolant inlet pipe 48, and the cover 42 is proximal to the base ( 41), then unload the nozzle tip.

According to the present invention, since the nozzle tip is automatically heated to a heating temperature at which a nozzle tip having a heat resistance strength that is not injured when the outlet is closed is sufficiently heated, the heat resistance of the nozzle tip is sufficiently secured to prevent the melt of the nozzle tip when the outlet is closed. . Therefore, the work load is reduced because it is not necessary to perform the nozzle tip melt and consequently the discharge of the mud material, the nozzle tip exchange operation due to the dropping of the starting surface, the removal of the spilled mud material and the recovery of the starting surface.

In addition, since the preheating operation is performed in an enclosed space and is not affected by the wind in the air, the preheating efficiency is improved and fuel consumption is reduced. In addition, several nozzle tips can be preheated at the same time, saving time and workload.

In the detailed description of the present invention described above with reference to the embodiments of the present invention, those skilled in the art or those skilled in the art having ordinary knowledge in the scope of the present invention described in the claims and It will be appreciated that various modifications and variations can be made in the present invention without departing from the scope of the art.

40: chamber
45: fuel gas inlet pipe
46: air inlet pipe
47: air discharge pipe
48: cooling water inlet pipe
49: cooling water discharge pipe
70: spark plug
80: thermometer
90: control unit

Claims (10)

chamber;
A nozzle tip support installed on the lower side of the chamber and supporting the nozzle tip;
A heating unit for heating the nozzle tip;
A cooling unit cooling the heated nozzle tip by supplying cooling water after completion of heating by the heating unit;
A thermometer measuring a temperature of the nozzle tip;
Control unit for controlling the operation of the heating unit and the cooling unit so that heating and cooling is repeated at regular intervals, and controls the intensity of heat by the heating unit based on the temperature measured by the thermometer so that the nozzle tip is heated to a predetermined temperature when heating Mud gun nozzle tip preheating device comprising a.
The base of claim 1, wherein the chamber comprises: a proximal end to which the nozzle tip support is installed; And
Mud gun nozzle tip preheating device, characterized in that it comprises a cover installed to be detachable on the base.
The mud gun nozzle tip preheating device according to claim 2, wherein the base further comprises a fork insertion hole into which the fork of the forklift is fitted.
According to claim 1, The cover is an internal confirmation window provided to see the inside of the chamber; And
Mud gun nozzle tip preheating device is installed on the upper side of the cover further comprises a fork handle is fitted with a fork of the forklift.
The mud gun nozzle tip preheating apparatus according to claim 1, wherein the nozzle tip support is composed of a plurality of bar-shaped structures arranged in parallel with a predetermined interval so that both ends of the nozzle tip span.
According to claim 1, The heating unit is connected to the chamber fuel gas inlet pipe for providing a flow path for the fuel gas from the fuel gas storage tank into the chamber;
A gas valve installed on the fuel gas inlet pipe;
A spark plug installed inside the chamber to generate an electric spark with a high pressure discharge to ignite the fuel gas; and
An ignition device for supplying power to the spark plug,
Mud gun nozzle tip preheating device, characterized in that the gas valve and the opening degree and the operation of the ignition device is made by the control unit.
7. The mud gun nozzle tip preheating apparatus according to claim 6, wherein the fuel gas inlet pipe is connected to a lower side of the side of the chamber positioned on an extension direction of the nozzle tip support.
According to claim 6, The heating unit is connected to the chamber air inlet pipe for providing a flow path for the air containing oxygen supplied from the air compressor into the chamber;
An air supply valve installed on the air inlet pipe;
An air discharge pipe connected to the chamber and providing a flow path to discharge air in the chamber to the outside; and
Further comprising an exhaust valve installed on the air discharge pipe,
Mud gun nozzle tip preheating device, characterized in that the opening and closing of the air supply valve and the exhaust valve is made by the control unit.
The electric heating wire of claim 1, wherein the heating part is embedded in an inner wall of the chamber and the nozzle tip support;
It includes a temperature controller for controlling the temperature of the electric heating wire,
Temperature control of the temperature controller is a mud gun nozzle tip preheating device, characterized in that made by the controller.
The cooling system of claim 1, wherein the cooling unit comprises: a cooling water inlet pipe connected to the chamber and providing a flow path such that the cooling water supplied from the cooling water storage tank flows into the chamber;
A drain pipe connected to the chamber and providing a flow path to discharge the waste water used to cool the nozzle tip to the outside of the chamber;
A water supply valve installed on the cooling water inlet pipe; and
A drain valve installed on the drain pipe,
Mud gun nozzle tip preheating device, characterized in that the opening and closing of the water supply valve and the drain valve is made by the control unit.

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