KR100644907B1 - Apparatus for monitoring a connection pipe of hot stoves for blast furnace - Google Patents

Abstract

The present invention relates to a contact tube monitoring apparatus for a hot blast furnace for a blast furnace, and includes a non-contact thermometer (101) and a laser sensor (102) equipped with a mobile device (104), a feed rail (105), a ball screw (107), and a feed motor. A measuring device unit 100 consisting of 109; The fixed side transfer rail 123 and the variable side support rail 125 are formed in the outer concentric circle of the contact pipe 5 and supported by the support 130, and the main frame 121 is fixed to the fixed side transfer rail 123. A rotating device unit 120 including a gear gear 127, a pinion gear 128, and a rotational transfer motor 129 which rotate along the variable side support rail 125; The computer 141 consists of a temperature indicator 141, a shape measuring system 142, a position control system 143, and a control unit 140 connected to an atmospheric temperature measuring device. Proper maintenance planning can be established by providing information by detecting and identifying the exact point and degree of deformation that is expected to be damaged. Appropriately shaped reinforcement and repair tools without the need for human measurements by accessing the surface of the liaison in charge. It is possible to prepare, and there is a practical advantage, such as shortening the repair time because it does not install obstacles like the upper and lower covers of the prior art in the contact tube.

Furnace, Regenerative Chamber, Combustion Chamber, Contact Tube, Non-Contact Temperature Detection

Description

Apparatus for monitoring a connection pipe of hot stoves for blast furnace}

1 is a perspective view showing a contact tube detection device of a conventional hot blast furnace;

Figure 2 is a partial detailed cross-sectional view showing a breakage state of the conventional hot stove for the furnace;

Figure 3 shows the overall configuration of the contact tube monitoring device of the hot blast furnace for the present invention furnace

       schematic,

Figure 4 is a part showing the configuration of the contact tube monitoring device of the hot blast furnace for the present invention

       Perspective,

5 is a front view showing in detail the measuring device and the rotating device according to the invention,

6 is a cross-sectional view showing in detail the measuring device according to the present invention;

7 is a cross-sectional view showing the side of the measuring device and the rotating device according to the present invention;

8 is a flowchart illustrating a control flow of the present invention.

<Explanation of symbols for major parts of drawings>

1: heat storage chamber 2: combustion chamber

3: fireproof smoke and 5: liaison officer

7: iron shell 8: inflation

9: welding section 10, 20: upper and lower cover

21: temperature sensor 21: temperature sensor

40: air leakage detection unit 41: housing

100: measuring device 101: non-contact thermometer

102: laser sensor 103: sensor protective cover

104: moving device body 105: transfer rail

106: transfer bearing 107: ball screw

108: ball screw bearing 109: feed motor

120: rotating unit 121: main frame

122: fixed side feed bearing 123: fixed side feed rail

124: fixed side support rail 125: variable side support rail

126: variable side roller 127: recreation gear

128: pinion gear 129: rotary feed motor

130: support 140: control unit

141: temperature indicator 142: shape measuring system

143: position control system 144: computer

The present invention relates to a device for monitoring a contact tube connecting a heat storage chamber and a combustion chamber of a hot blast furnace facility for a furnace, in particular, the deformation of the contact tube in the blast furnace process to detect the progress of the damage of the shell by sensing the temperature around the circumferential surface of the contact tube The present invention relates to a contact tube monitoring device for a blast furnace for monitoring the degree.

In general, the hot blast furnace is equipped with a hot blast facility cost for supplying a high temperature hot blast inside the blast furnace, and the hot blast furnace facility is provided with a contact tube for communicating the heat storage chamber and the combustion chamber with each other, the inside of the contact tube high temperature combustion Refractory brick is built to withstand (about 1350 ℃) and high pressure (4.0kg / ㎠) and the outside is firmly wrapped in a thick shell.

As shown in FIG. 1, the hot air supplied to the furnace is burned by using gas and air in the combustion chamber 2, raised to about 1300 ° C., and then stored in the heat storage chamber 1, and then about 270 ° C. coming from the blower. It is mixed with the cold air of the temperature of about 4kg / ㎠ and sent to the molten steel through the contact pipe (5).

In the furnace, after charging iron ore and coke, the hot air sent from the hot blast furnace is blown to cause a melt reduction reaction to produce molten water.

However, since the high temperature hot air in the heat storage chamber 1 and the cold air supplied from the blower are mixed in the contact pipe 5, the steel shell 7 having the expansion ribs of the contact pipe 5 is shown in FIG. 2. Contracts or expands rapidly.

Therefore, the expansion part 8 is generated in the steel shell 7 having the elastic ribs, and cracks are generated in the welding section 9 so that hot air of high temperature and high pressure is exposed to the outside of the contact pipe 5. 5) There is a problem that the damage and the operation of the furnace is stopped.

In order to solve such a problem, there is a conventional patent application No. 97-53895 (contact tube damage detection device of a furnace for hot blast furnace), but the contents of the patent application is the upper and lower cover 10 on the outside of the contact tube (5) ), (20) and the temperature sensor 21, the leak rate detecting unit 40 and the receiving box 41, after the leak occurs the amount of leak occurred and the detected temperature of the contact tube (5) The technology that informs the degree of damage through the alarm is a gist but has the following problems.

If the crack is generated in the contact pipe (5) starts the air leakage has a characteristic that the damaged area is rapidly expanded due to the high pressure to repair quickly when the damage occurs, but the upper and lower covers (10), (20) of the contact pipe (5) Because it is installed at the front circumference, it cannot be accessed quickly, and the drift pipe 5 is installed at a height and consists of a very large diameter, so that the upper and lower covers 10 and 20 also have a larger diameter than the connecting pipe 5. Since it is formed to be not easy to decompose the heavy material in the height there is a problem to delay the recovery time.

      In addition, the crack of the contact pipe (5) is not suddenly generated in a moment, and as the surface temperature of the steel (7) gradually rises, the expansion part (8) expands, and the crack starts due to the generation of thermal stress in the welding section (9). If the same phenomenon is captured in advance, preventive maintenance is possible, but in the prior art, there is a problem in that it is not possible to grasp the degree of damage of the contact pipe 5 generated by the leak due to the cracks on the surface of the metal shell 7.

And because the surface area of the contact tube 5 is very large, it is difficult to quickly determine which part is damaged or how much in detail, and there is a problem in that a large number of thermometers must be installed to determine the exact position.

      The present invention has been invented to solve various problems of the contact tube monitoring device of the conventional blast furnace hot stove in view of the above situation, the damage of the contact tube before the leak occurs to detect the state of deformation and damage is predicted By providing information by identifying the exact point and degree of deformation, it is possible to establish an appropriate maintenance plan, access to the surface of the liaison officer at the sue, and prepare the appropriately shaped reinforcement and repair tools without human measurement. Since it does not install obstacles like the upper and lower covers of the prior art, it provides a contact tube monitoring device for the hot blast furnace for the furnace which has a structure that can shorten the repair time. The purpose is to prevent it.

      In order to achieve the above object, the liaison tube monitoring device of the hot-melting furnace for the invention of the present invention includes a non-contact thermometer 101 and a laser device 102, a moving device body 104 and a transfer rail 105 and a ball screw 107. And measuring unit 100 consisting of a transfer motor 109; The fixed side transfer rail 123 and the variable side support rail 125 are formed in a concentric circle on the outer circumference of the contact pipe 5 and supported by the support 130, and the main frame 121 is fixed to the fixed side transfer rail 123. A rotation device unit 120 including a gear gear 127, a pinion gear 128, and a rotational transfer motor 129 which rotate along the variable side support rail 125; The computer 141 includes a temperature indicator 141, a shape measuring system 142, a position control system 143, and a controller 140 connected to an air temperature measuring instrument.

Hereinafter, with reference to the accompanying drawings will be described in detail the contact tube monitoring device of the hot stove for the present invention.

Figure 3 is a schematic diagram showing the overall configuration of the contact tube monitoring device of the hot blast furnace for the present invention, Figure 4 is a partial perspective view showing the configuration of the contact tube monitoring device of the hot blast furnace for the present invention, Figure 5 is a measuring apparatus according to the present invention 6 is a cross-sectional view illustrating in detail a measuring device according to the present invention, and FIG. 7 is a cross-sectional view showing a side of the measuring device and a rotating device according to the present invention. The invention is a measuring device unit 100 consisting of a thermometer 101 for measuring the temperature of the surface of the contact tube (5) and a laser sensor 102 for measuring the amount of change of deformation, and the measuring device 100 to the appropriate coordinate position It is composed of a rotating device unit 120 for transferring, and a control unit 140 for controlling the measuring device unit 100 and the rotating device unit 120 and calculating the measured result.

The non-contact thermometer 101 and the laser sensor 102 of the measuring device unit 100 are attached to the mobile device body 104 and are protected by the sensor protective cover 103 and transferred to the mobile device main body 104. A bearing and a ball screw bearing are built in and coupled to the transfer rail 105 and the ball screw 107, respectively, and the transfer motor 109 is assembled at the end of the ball screw 107.

The main frame 121 of the rotating device 120 is configured of sufficient strength and size to support the measuring device 100, one side thereof is connected to a plurality of fixed-side transfer bearing 122, fixed The side conveying bearing 122 is coupled to the fixed side conveying rail 123.

The fixed side conveyance rail 123 is attached to the fixed side support rail 124, and the fixed side conveyance rail 123, the fixed side support rail 124 and the variable side support rail 125 are connected to the contact pipe (5). It is formed in a circular shape as a center and is maintained and supported by the support 130 at regular intervals.

The variable-side roller 126 is composed of a plurality of inserts into the variable-side support rail 125, the lower gear 127 and the lower side of the fixed-side support rail 124 and the variable-side support rail 125, the inner side around the inner circumference Is installed, the rotary feed motor 129 is attached to the lower portion of the main frame 121 to rotate the pinion gear 128, so that the entire rotation device 120 by the gear 127 and the pinion gear 128 It will turn around the liaison tube (5).

The control unit 140 includes a temperature indicator 141 and a formation measuring instrument 142 for relaying the data transmitted from the laser sensor 102 and the non-contact thermometer 101 to the computer 144 and to select an operation model. Accordingly, a position control system 143 for transferring the measuring device unit 100 to an appropriate position and an atmospheric temperature measuring device for measuring an external temperature (not shown) are provided.

Next, with reference to the flow chart of Figure 8 will be described in detail the operation of the contact tube monitoring device of the hot stove for the furnace of the present invention.

When the operation model is selected through the screen of the computer 144, the automatic monitoring of the whole section, the automatic monitoring of the certain section, the centralized monitoring section of the measurement section, the feed motor 109 and the rotation feed motor 129 by the position control system 143. Is operated at the programmed speed to move the measuring device 100 in the feed path while the non-contact thermometer 101 and the laser sensor 102 measure the temperature and deformation of the contact tube 5 and the measured result is measured by the temperature indicator ( 141 and the shape measurement system 142, and consequently the measurement data is concentrated in the computer 144.

The computer 144 calculates a temperature distribution for each coordinate according to Equation 1 by using the data transmitted from the temperature indicator 141 and the operation condition information, the optimal state information, and the external influence information previously stored in the memory.

     t (° C) = mt + (st-a) + (ct-d)

Where t is the actual temperature of the bar, mt is the current measurement temperature of the non-contact thermometer, st is the reference temperature (20 ° C), a is the measurement temperature of the air temperature meter, ct is the reference conduction heat, and c is the temperature It is conduction heat.

In addition, the computer 144 calculates the deformation amount for each coordinate according to Equation 2 using the data transmitted from the shape measuring system 142, the operation condition information, the optimal state information, and the external influence information.

      h = sL-(mL + (α * sL * (st-mt))

Where h is the amount of deformation per coordinate, sL is the reference height at 20 ℃, mL = the current measurement height of the laser sensor, α is the coefficient of thermal expansion of the support and mainframe, st = reference temperature (20 ℃), and mt = ambient temperature. The measuring temperature of the measuring instrument.

When the temperature distribution for each coordinate and the shape change amount for each coordinate are calculated by Equation 1 and 2, the alarm operation level is determined according to the following Table 1, and the alarm is activated, and the contact tube status determination comprehensive information is indicated through the screen of the computer 144. Done.

level condition Alarm 1 〉 + 100 ℃ or h = 00mm Alarm 2 〉 + 100 ℃〉 + 150 ℃ or h = 00mm Alarm 3 〉 + 150 ℃ 〈+ 200 ℃ or h = 00mm Emergency 1 〉 + 200 ℃ 〈+ 250 ℃ or h = 00mm Emergency 2 〉 + 250 ℃ 〈+ 300 ℃ or h = 00mm Emergency 3 〉 + 300 ℃ or h = 00mm

The driver can take appropriate measures based on the comprehensive information of the contact officer status judgment according to Table 1 above.

The contact tube monitoring device of the present invention hot blast furnace for acting as described above detects the state of deformation before the break of the contact pipe is damaged and provides information by grasping the exact point and degree of deformation is predicted damage. This will allow for proper maintenance planning, access to the surface of the liaison station in the complaint, and the provision of appropriately shaped reinforcements and repair tools without the need for human measurements, and the use of obstacles, such as the top and bottom covers of the prior art, outside the liaison officer. Since there is no installation, there is a practical advantage, such as shortening the repair time.

Claims (1)

A measuring device unit 100 including a moving device body 104 equipped with a non-contact thermometer 101 and a laser sensor 102, a transfer rail 105, a ball screw 107, and a transfer motor 109; The fixed side transfer rail 123 and the variable side support rail 125 are formed in a concentric circle on the outer circumference of the contact pipe 5 and supported by the support 130, and the main frame 121 is fixed to the fixed side transfer rail 123. A rotation device unit 120 including a gear gear 127, a pinion gear 128, and a rotational transfer motor 129 which rotate along the variable side support rail 125; A contact tube monitoring apparatus for a hot stove for a molten material, characterized in that the computer 141 is composed of a control unit 140 connected with a temperature indicator 141, a shape measuring system 142, a position control system 143 and an atmospheric temperature measuring device.

Images