KR20010056260A - Expansion Tube having a Cooling Device - Google Patents

Abstract

PURPOSE: A flexible pipe equipped with a cooling device is provided to solve demerits such as breakdown of a large scale facility due to deformation and crack of the flexible pipe and shutdown of operation in a blast furnace by installing a steel cooling pipe at the required location of the bellows formed on the surface of the flexible pipe so that a cooling agent is flown through the steel cooling pipe. CONSTITUTION: In a flexible pipe (40) which is connected to the middle part of the connecting piping (31), and on the surface of which an irregular shaped bellows is formed, the flexible pipe equipped with a cooling device comprises a plurality of steel cooling pipes (30) installed at the required locations of the bellows (32), wherein the steel cooling pipes have the same shape as a circumference of the flexible pipe, and the inlet and outlet of a cooling agent are formed in the upper and lower parts of the steel cooling pipe respectively; a cooling agent drain preventing plug installed at both end parts of the steel cooling pipe for preventing draining of the cooling agent; and a cooling pipe installed at the upper part of the steel cooling pipe.

Description

Expansion Tube with a Cooling Device {Expansion Tube having a Cooling Device}

The present invention relates to a flexible pipe installed in each communication pipe of the hot stove facility, and more particularly, to a flexible pipe provided with a cooling device to prevent deformation and damage caused by thermal stress.

In general, the hot air path for generating a high temperature hot air comprises a combustion chamber 14 and the heat storage chamber 10 as shown in FIG. High temperature hot air is generated after a predetermined time, for example, 50 extra combustion processes, and heat obtained by combustion is stored in the heat storage chamber 10. Subsequently, in order to supply hot air of about 1200 ° C. stored in the heat storage chamber 10 to the blast furnace, a fan is operated to supply wind from the outside through a connection pipe located under the heat storage chamber 10. The hot air stored in the chamber 10 is finally supplied to the blast furnace via the dome 11, the communication pipe 12, and the combustion chamber 14 of the heat storage chamber 10 sequentially.

Fireproof lead is installed on all inner walls of the hot stove configured as above to allow the pipe to withstand high pressure thermal stress, and the predetermined section of each contact pipe is subject to thermal stress, including explosion caused by disturbance factors during the passage of hot wind. Stretch tube 20 is installed to withstand.

The expansion pipe 20 is installed in the connection pipe 12 of the hot blast furnace equipment for supplying hot air of about 1200 ℃ to the blast furnace to absorb the expansion or contraction of the pipe due to repeated heating, cooling during operation deformation of the facility As the main component to be prevented, the surface of the tube made of a thin iron plate is formed wrinkles (20a) in the form of repeated irregularities (凹凸).

The conventional expansion pipe 20 shown in Figure 2 is installed in the middle of the connecting pipe 15, and continuously repeats the contraction and expansion in the high temperature conditions of 1200 ℃ during blowing and room temperature during combustion. Therefore, the expansion pipe 20 may be damaged by the early deformation or cracking, very small holes (Pin Hole when the hot air of high temperature and high pressure flowing through the interior of the expansion pipe 20 leaks to the outside through the damage site) ) Can be formed, and if the damaged part is enlarged within a short time in proportion to the passage of time, the hot air supplied to the blast furnace is reversed to cause a breakdown of the large installation. And this should stop working at the blast furnace. This problem has already occurred in Gwangyang 3 blast furnace recently.

Accordingly, in order to prevent the occurrence of such a problem, conventionally, as shown in FIG. 2, several cooling rubber hoses 16 are respectively installed in the pleats 20a of the expansion pipe 20 and the expansion pipe from the coolant supply pipe 17 is installed. Cold air is supplied to the surface of (20). In this case, the cooling effect is low because cold air is supplied in the atmospheric state. Hose 16 must be installed.

On the other hand, due to the heat deformation caused by the temperature difference, the surface of the expansion tube 20 is generated, such breakage of the surface of the expansion tube 20 is rapidly enlarged, causing equipment accidents due to large rupture.

Therefore, the present invention provides a flexible tube having a cooling device that can solve the above-mentioned disadvantages by installing a cooling tube steel material in the recess of the corrugation formed on the surface of the expansion tube, and the coolant flows through the cooling tube steel material. Its purpose is to.

The present invention for achieving the above object is connected to the intermediate portion of the connecting pipe, the surface of the pipe in the concave-convex corrugation is formed, the same shape as the circumference of the expansion tube, A plurality of cooling pipe steels having coolant inlets and outlets respectively formed at upper and lower portions thereof, a coolant leakage preventing plug installed at both ends of the cooling pipe steel to prevent the leakage of coolant, and an upper portion of the cooling pipe steels; It includes a cooling tube installed. In addition, the plurality of cooling tube steels have binding plates connected to the upper and lower portions, respectively, and are configured to be coupled to each other by a binding bolt inserted into the binding plate, and the cooling tube steels are formed at each of the upper and lower portions. Coolant inlet and outlet are characterized in that coupled to cross each other.

1 is a structural diagram for explaining a hot stove to which the present invention is applied.

Figure 2 is a structural diagram for explaining a conventional expansion tube equipped with a cooling device.

Figure 3 is a structural diagram of the expansion pipe according to the present invention.

Figure 4 is a cross-sectional view for explaining the expansion tube according to the present invention.

5 is a cross-sectional view for explaining a coupling state of the expansion pipe according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: heat storage room 11: heat storage room dome

12: liaison 13: combustion chamber dome

14: combustion chamber 15 and 31: connection piping

16: rubber hose 17: coolant supply line

19: refractory softening 20 and 40: expansion pipe

20a and 32: corrugation 21 and 36: binding plate

21a and 36: binding bolt 29: cooling pipe

30: cooling tube steel 30a: first cooling tube steel

30b: 2nd cooling pipe steel 31: connection piping

34 and 33a: coolant inlet 32a and 33: coolant outlet

35: coolant leakage plug

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

3 is a structural diagram for explaining the expansion pipe according to the present invention, the expansion pipe 40 having a corrugation 32 made of irregularities on the surface is installed in the middle of the connection pipe 31, the expansion pipe ( 40) and the inner wall of the connection pipe 31 is provided with a refractory lead 19 so that the pipe can withstand high-temperature thermal stress. In addition, as shown in FIG. 4, the recessed portion of the corrugation 32 is provided with a cooling tube steel material 30 having a semicircular shape to support the cooling tube 29.

The cooling pipe steel 30 used in the embodiment of the present invention is made of a first cooling pipe steel material (30a) and the second cooling pipe steel material (30b), as shown in Figure 5, the binding plate formed in each of the upper and lower By the binding bolt 21a inserted in the 21, the same shape as that of the circumference of the expansion pipe 40, that is, is circularly bound. In addition, coolant leakage preventing plugs 35 for preventing the leakage of the coolant are installed at both ends of each of the first cooling pipe steel material 30a and the second cooling pipe steel material 30b.

The cooling pipe steel 30 is made of a copper alloy with low thermal deformation and excellent thermal conductivity, and is manufactured to have the same shape in full contact with the surface of the corrugation 32. This is to obtain the maximum cooling effect according to the increase of the contact area, and to prevent deformation of the surface of the flexible tube 40 due to high temperature such as lifting.

A coolant injection cooling tube 29 made of copper is installed at an upper portion of the cooling tube steel material 30, and a coolant injection hole 34 and a coolant discharge port are respectively provided at an upper portion and a lower portion of the first cooling tube steel material 30a. 32a is formed, and a coolant discharge port 33 and a coolant injection port 33a are formed at an upper portion and a lower portion of the second cooling tube steel material 30b, respectively. In this way, by forming the injection position of the coolant differently, the cooling effect on the surface of the flexible tube 40 is equalized as a whole to maintain the elasticity of the flexible tube 40 inherent.

In addition, the binding plate 36 is installed on the upper and lower portions of the first cooling tube steel material 30a and the second cooling tube steel material 30b perpendicular to each other to prevent lifting of the surface of the expansion pipe 40 and the bolts 37 ) To fix it.

The present invention allows the first cooling tube steel 30a and the second cooling tube steel 30b to be bound in a circle along the circumference of the surface of the corrugation 20a formed in the large stretch tube 40. In this case, the first cooling pipe steel (30a) and the first cooling pipe steel (30a) and the separation of the second cooling pipe steel (30b) and at the same time to prevent the lifting of the surface of the expansion pipe (40) and The binding plate 21 is formed in the both ends of the 2nd cooling pipe steel material 30b, and the said binding plate 21 is fixed using the binding bolt 21a.

The cooling pipe steel 30 may be two to three as needed, and as the coolant supplied into the cooling pipe steel 30, air, nitrogen, water, or the like may be used depending on the characteristics of the temperature. have.

As described above, in the present invention, a cooling tube steel is installed in the main portion of the corrugation formed on the surface of the expansion tube, and the coolant flows through the cooling tube steel to limit the temperature rise of the expansion tube so that Damage or rupture can be prevented. Therefore, there is an effect that productivity can be improved due to stable operation, extension of equipment life and shortening of maintenance time.

Claims (4)

In the expansion pipe which is connected to the intermediate portion of the connecting pipe, the surface of the pipe is formed with uneven wrinkles, A plurality of cooling pipe steels having the same shape as the circumference of the expansion pipe, installed in the recesses of the pleats, and having coolant inlets and outlets respectively formed at upper and lower portions thereof; A coolant leakage preventing plug installed at both ends of the cooling pipe steel to prevent the leakage of the coolant; And a cooling tube provided on an upper portion of the cooling tube steel. The method of claim 1, The plurality of cooling tube steel material has a coupling plate connected to each of the upper and lower, the expansion tube having a cooling device, characterized in that configured to be coupled to each other by a binding bolt inserted into the binding plate. The method of claim 1, The cooling pipe steel is a flexible tube having a cooling device, characterized in that coupled to the coolant inlet and outlet formed in each of the upper and lower to alternate with each other. The method of claim 1, The cooling tube steel material is made of a copper alloy, and the cooling tube is a flexible tube having a cooling device, characterized in that made of copper.