KR20120044173A - Apparatus for waste heat recovery of furnace slag - Google Patents

Abstract

PURPOSE: A device for recovering waste heat of blast furnace slag is provided to facilitate maintenance of a waste heat exchanger by using a flow rate control valve and a coupling unit. CONSTITUTION: A device for recovering waste heat of blast furnace slag comprises a cooling spray unit(30), a guide pipe(70), a waste heat exchanger(40), a flow rate control valve(76), and a coupling unit(110). The cooling spray unit recovers and reuses waste heat produced while cooling blast furnace slag to cool the blast furnace slag. The guide pipe guides the air flowing through the upper side of the cooling spray unit toward a storage tank provided on the exterior of a housing part. The waste heat exchanger exchanges heat with the air passing through the guide pipe. The flow rate control valve controls the flow of air to the waste heat exchanger. The coupling unit is installed between the flow rate control valve and the waste heat exchanger in order to separate and connect the guide pipe.

Description

Waste heat recovery device for blast furnace slag {APPARATUS FOR WASTE HEAT RECOVERY OF FURNACE SLAG}

The present invention relates to a waste heat recovery device for blast furnace slag, and more particularly, to a waste heat recovery device for blast furnace slag that can facilitate the operation of recovering the waste heat generated during the treatment of the blast furnace slag.

Generally, in order to produce pig iron, iron ore, coke, limestone, and the like, which are raw materials for molten iron, are introduced into the blast furnace, and the iron ore generates blast furnace slag as a by-product in the reduction and melting process.

The blast furnace slag is subjected to ash retreatment in the form of aggregates in dry feet or in the slag plant, which is used as cement raw material.

The above technical configuration is a background art for helping understanding of the present invention, and does not mean a conventional technology well known in the art.

An object of the present invention is to provide a waste heat recovery apparatus for blast furnace slag that can reduce the hot water supply cost by recycling the waste heat generated during the treatment process of the blast furnace slag, and can also facilitate maintenance work.

Waste heat recovery apparatus for blast furnace slag according to the present invention is provided with: a cooling jet unit for cooling the blast furnace slag by spraying cooling water to the blast furnace slag supplied to the inside of the housing portion, and the air moved to the upper side of the cooling spray unit is provided outside the housing portion A guide heat pipe section for guiding the storage tank, a waste heat heat exchanger installed inside the guide pipe path to exchange heat with air passing through the guide pipe path, and controlling the flow of air installed in the guide pipe path to the waste heat heat exchanger It is installed between the flow control valve and the flow control valve and the waste heat exchanger and includes a detachable portion for separating and coupling the guide pipe.

In addition, the waste heat exchanger, it is preferable to include a heat exchange body in the shape of a pipe line installed along the inner side of the guide pipe passage portion, and a heat exchange pipe line which is installed along the inside of the heat exchange body and guides the movement of the working fluid in which heat exchange takes place.

In another aspect, the present invention, the first temperature sensor unit for measuring the temperature of the working fluid supplied to the heat exchange pipe and delivers the measured value to the control unit and the first measuring the temperature of the working fluid discharged from the heat exchange pipe to deliver the measured value to the control unit It is preferable to further include a temperature sensor unit.

In another aspect, the present invention, it is preferable to further include a washing spraying unit which is installed in the hollow portion of the heat exchanger body and sprays the washing water into the heat exchanger body.

In addition, the washing spray unit, it is preferable to include a conveying pipe for transporting the washing water along the hollow portion and a nozzle member for forming a passage for spraying the washing water along the circumference of the conveying pipe.

In another aspect, the present invention, it is preferable to further include a main injection unit for removing the foreign matter in the air by injecting a dust removal in the guide pipe portion located between the waste heat exchanger and the storage tank.

The present invention preferably further includes a sub-injection unit which is installed above the cooling injection unit and injects dust removal to remove foreign substances in the air.

Waste heat recovery apparatus for blast furnace slag according to the present invention, because the waste heat generated during the cooling operation of the blast furnace slag is recovered and reused, it is possible to reduce the hot water supply cost.

In addition, the present invention can facilitate the maintenance work of the waste heat exchanger using the flow control valve and the removable portion, it is possible to improve the workability.

1 is a schematic view showing a waste heat recovery apparatus for blast furnace slag according to an embodiment of the present invention.
2 is a block diagram showing a state in which the cooling injection unit and the main injection unit according to an embodiment of the present invention.
Figure 3 is a block diagram showing a state in which the washing spray unit is operated according to an embodiment of the present invention.
4 is a block diagram showing a state in which the removable portion according to an embodiment of the present invention are separated.
5 is a cross-sectional view showing an installation state of the waste heat exchanger and the washing spray unit according to an embodiment of the present invention.
6 is a block diagram of a waste heat recovery apparatus for blast furnace slag according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings will be described an embodiment of the waste heat recovery apparatus for blast furnace slag according to the present invention. For convenience of explanation, the waste heat recovery apparatus for blast furnace slag used in the steel mill will be described as an example. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to the intention or convention of a user or an operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a configuration diagram schematically showing a waste heat recovery apparatus for blast furnace slag according to an embodiment of the present invention, Figure 2 is a view showing a state in which the cooling injection unit and the main injection unit operating in accordance with an embodiment of the present invention. 3 is a configuration diagram showing a state in which the washing spray unit operating in accordance with an embodiment of the present invention, Figure 4 is a configuration diagram showing a detachable state in accordance with an embodiment of the present invention. 5 is a cross-sectional view illustrating an installation state of a waste heat exchanger and a washing spray unit according to an embodiment of the present invention, and FIG. 6 is a block diagram of a waste heat recovery apparatus for blast furnace slag according to an embodiment of the present invention.

1 to 6, the waste heat recovery apparatus 1 for blast furnace slag according to an embodiment of the present invention, the cooling water 36 to the blast furnace slag 22 is supplied to the inside of the housing portion 10. Cooling injection unit 30 for cooling the blast furnace slag 22 and the air moved to the upper side of the cooling injection unit 30 to guide the storage tank 100 provided on the outside of the housing unit 10 A guide heat pipe (70), which is installed inside the guide pipe path (70), the heat exchanger (40) for waste heat exchange with air passing through the guide pipe path (70), and the guide pipe path (70). It is installed between the flow control valve 76 and the flow control valve 76 and the waste heat exchanger 40 to control the flow of air moved to the waste heat exchanger 40 and the guide pipe path 70 It includes a detachable portion 110 for separating and combining.

The slag supply pipe 20 is installed to guide the movement of the blast furnace slag 22 through the side of the housing part 10, and the blast furnace slag 22 is introduced into the housing part 10 along the slag supply pipe 20. ) Is supplied.

The cooling spray unit 30 is installed below the slag supply passage 20 for supplying the blast furnace slag 22.

The cooling spray unit 30 injects a high-pressure cooling water 36 to the blast furnace slag 22 discharged from the slag supply pipe 20, and the handmade slag 24 is generated by the rapid cooling of the blast furnace slag 22. do.

The reclaimed slag 24 is contained in the storage case 12 provided on the lower side of the housing portion 10, and is discharged to the outside through a separate pipe.

The coolant 36 falling into the storage case 12 is transferred to the storage tank 100 through the connection pipe 102.

The cooling spray unit 30 includes a first motor 32 forcing the flow of the cooling water 36 and a guide pipe 34 connected to the first motor 32 to guide the flow of the cooling water 36.

The coolant 36 injected into the blast furnace slag 22 is evaporated into the water vapor 26 while meeting the blast furnace slag 22 having a high temperature, and is moved above the housing part 10.

The air moved to the upper side of the housing 10 includes foreign substances such as water vapor 26 and dust, which are removed by the operation of the main injection unit 80 and the sub-injection unit 90.

The main injection unit 80 removes foreign substances in the air by injecting a dedusting 86 into the air after passing the waste heat exchanger 40, and the sub-injection unit 90 has a waste heat exchanger 40. The dedusting 86 is sprayed on the air before it is introduced into the air to remove foreign substances in the air.

The sub-injection part 90 is provided above the cooling injection part 30, and removes foreign substances, such as dust and water vapor 26 contained in air, before going to the main injection part 80.

The sub-injection unit 90 is connected to the sub-injection pipe path 94 provided across the housing part 10 and the sub-injection pipe path 94 to force the flow of the vibration damping 86 ( 92).

The sub-motor 92 is connected to the control unit 60, the operation is controlled, the steam generator (26) for removing the dust 26 and dust generated when the high temperature blast furnace slag 22 meets the cooling water (36) Spray it.

The guide pipe part 70 for guiding air moved upwardly of the cooling injection part 30 toward the storage tank 100 provided on the outside of the housing part 10 is connected to an upper side of the housing part 10. One side is connected to the first guide pipe (72) and the first guide pipe (72) and the other side includes a second guide pipe (74) installed in the storage tank 100 direction.

The guide pipe part 70 is provided with a flow rate control valve 76 for controlling the flow of air moved to the waste heat exchanger 40, opening and closing the flow path in accordance with the control signal of the control unit 60, By varying the diameter, the flow of fluid, including air and water vapor 26, is controlled.

The flow rate control valve 76 is installed in the first guide pipe 72, and the heat exchanger 40 for waste heat is installed inside the second guide pipe 74.

The detachable part 110 is installed between the first guide pipe 72 and the second guide pipe 74 to be coupled and separated.

Detachable portion 110, a variety of coupling devices may be used in the technical concept of separating and coupling the guide pipe portion 70, by the use of the removable portion 110, the guide pipe portion 70 and the heat exchanger for waste heat ( 40) The maintenance work of the device can be made easily.

The detachable part 110 according to an embodiment may include a first flange 112 connected to the first guide pipe 72, a second flange 114 and a first flange connected to the second guide pipe 74. A fastening bolt 116 and a fastening nut 118 connecting the 112 and the second flange 114 are included.

The waste heat exchanger 40 installed inside the second guide pipe path 74 may be variously modified within a technical concept in which heat exchange with waste heat of the blast furnace slag 22 is performed.

The waste heat exchanger 40 includes a heat exchange body 41 having a pipe shape installed along the inside of the guide pipe part 70, and a working fluid 44 which is installed along the inside of the heat exchange body 41 and performs heat exchange. It includes a heat exchange pipe path 43 for guiding the movement.

The heat exchange body 41 is formed in a circular tube shape, the heat exchange pipe path 43 is provided in plurality along the circumferential direction of the heat exchange body (41).

The waste heat exchanger 40 is connected to the inlet pipe 45 through which the working fluid 44 is supplied and the discharge pipe 46 through which the working fluid 44 is discharged. A heat exchange tube path 43 through which the working fluid 44 is moved is provided.

The working fluid 44 which is moved to the heat exchange pipe line 43 through the inlet pipe 45 is heat-exchanged while being moved along the heat exchange body 41, and the working fluid 44 is exchanged through the discharge pipe 46. 41) is moved outward.

Since the first temperature sensor unit 47 is installed in the inlet pipe 45, the temperature of the working fluid 44 supplied to the waste heat exchanger 40 is measured, and the measured value is transmitted to the controller 60.

Since the second temperature sensor unit 48 is also installed in the discharge pipe 46, the temperature of the working fluid 44 discharged from the waste heat exchanger 40 is measured, and the measured value is transmitted to the controller 60.

The surface of the waste heat exchanger 40 may be coated with a ceramic surface to remarkably improve corrosion resistance by acid and alkali.

The washing spray unit 50 installed in the hollow portion 42 of the heat exchanger body 41 and spraying the washing water 58 into the heat exchanger body 41 may be provided with dust or the like attached to the inner surface of the heat exchanger body 41. Remove it.

The washing spray unit 50 according to an embodiment includes a passage through which the washing water 58 is sprayed along the circumference of the transfer pipe 52 and the transfer pipe 52 for transferring the washing water 58 along the hollow part 42. It comprises a nozzle member 54 to form a.

Since the high-pressure washing water 58 is automatically sprayed inside the waste heat exchanger 40, the performance and maintenance ability of the waste heat exchanger 40 can be improved.

The transfer pipe 52 is connected to the second motor 56 forcing the movement of the washing water 58, and the first motor 32 of the cooling spray unit 30 and the second motor of the washing spray unit 50 ( 56 is connected to the control unit 60.

The main injection unit 80 is installed to remove the foreign matter in the air by injecting the dedusting 86 to the inside of the guide pipe part 70 located between the waste heat exchanger 40 and the storage tank 100.

Water vapor 26 or dust contained in the air from the waste heat exchanger 40 toward the storage tank 100 is dropped into the storage tank 100 by the operation of the main injection unit 80.

The main injection unit 80 is installed in the second guide pipe path 74 located above the storage tank 100, and sprays the dedusting 86 to the air moving along the second guide pipe path 74.

The main spray unit 80 according to an embodiment of the present invention is connected to the main spray pipe line 84 and the main spray pipe line 84 installed across the guide pipe unit 70 to flow the dust removal 86. It includes the main motor 82 to force.

The main motor 82 is connected to the control unit 60, the operation is controlled, and sprays the dust removal 86 to the air moving through the guide pipe section 70, dust or water vapor 26 contained in the air Foreign substances, such as, fall into the storage tank 100, such as the bin (86).

The control unit 60 receives the measured values of the first temperature sensor unit 47 and the second temperature sensor unit 48 and receives the first motor 32 and the cleaning spray unit 50 of the cooling spray unit 30. The second motor 56, the main motor 82 of the main injection unit 80, the sub motor 92 and the flow control valve 76 of the sub injection unit 90 are controlled.

By the operation of the control unit 60, the air flows through the waste heat exchanger 40 toward the storage tank 100 more easily, and foreign substances such as water vapor 26 or dust contained in the air are removed. .

Hereinafter, with reference to the accompanying drawings will be described in detail the operating state of the blast furnace slag waste heat recovery device 1 according to an embodiment of the present invention.

The blast furnace slag 22 is supplied into the housing part 10 through the slag supply pipe 20.

Since the cooling water 36 injected through the guide pipe path 34 of the cooling injection part 30 is injected into the blast furnace slag 22, the blast furnace slag 22 is quenched and changed into the water slag 24.

A portion of the cooling water 36 in contact with the hot blast furnace slag 22 is vaporized to become water vapor 26, and the heated air in contact with the blast furnace slag 22 is also moved upwards with the water vapor 26.

The reclaimed slag 24 is stored in the storage case 12 and then discharged to the outside through a separate conduit, and the water stored in the storage case 12 is moved to the storage tank 100 through the connecting conduit 102.

The dust injection 86 is sprayed from the sub-injection unit 90 provided above the cooling injection unit 30 to first remove foreign substances contained in the air.

The control unit 60 controls the sub-injection pipe path 94 in the technical concept of removing foreign matter contained in the air while minimizing the cooling of the air moved from the cooling spray unit 30 to the waste heat exchanger 40. The injection of the dedusting 86 through is adjusted to the minimum.

Air including the water vapor 26 in which primary vibration is made while passing through the sub-injection unit 90 is moved above the housing unit 10.

Air moved along the guide pipe part 70 connected to the housing part 10 performs heat exchange while passing through the heat exchanger 40 for waste heat located in the second guide pipe path 74.

Since the heat exchange is performed as the air passes through the hollow portion 42 provided inside the heat exchange body 41, the heat exchange area is increased to improve thermal efficiency.

The working fluid 44 which is moved to the waste heat exchanger 40 is measured by the first temperature sensor 47 while passing through the inlet pipe 45 and is discharged through the waste heat exchanger 40. The working fluid 44 discharged to the 46 is measured by the second temperature sensor unit 48 and the measured value is transmitted to the control unit 60.

When the difference between the value measured by the first temperature sensor unit 47 and the value measured by the second temperature sensor unit 48 is small, the foreign matter is attached to the surface of the waste heat exchanger 40. 60 determines and operates the second motor 56 of the cleaning spray unit 50.

Since the washing water 58 passing through the second motor 56 is moved along the transfer pipe 52 and sprayed from the nozzle member 54, the inner surface of the hollow part 42 of the heat exchanger body 41 is washed for waste heat. Improve heat exchange performance of the heat exchanger (40).

The spray of the washing water 58 is stopped after the set time, and the control unit 60 adds the washing spray unit 50 based on the measured values of the first temperature sensor unit 47 and the second temperature sensor unit 48. Determine the operation.

Foreign matter in the air that passes through the waste heat exchanger 40 and moves toward the storage tank 100 is dropped into the storage tank 100 together with the dedusting 86 injected by the operation of the main injection unit 80. .

The water collected in the storage tank 100 may be re-supplied to the main motor 82, the first motor 32, the second motor 56, and the sub-motor 92 to be used again.

When maintenance work of the waste heat exchanger 40, the main injection unit 80, and the storage tank 100 is required, the control unit 60 locks the flow control valve 76 to the second guide pipe 74. To block the movement of air into the

After releasing the coupling of the fastening bolt 116 and the fastening nut 118 to separate the first flange 112 and the second flange 114, the waste heat exchanger 40 and the main injection unit 80 and storage Carry out maintenance work on the tank 100.

When the maintenance work is completed, the detachable part 110 is recombined to connect the first guide pipe 72 and the second guide pipe 74, and the flow control valve 76 is opened to open the guide pipe part 70. Allow the movement of air through

Alternatively, when adjusting the movement amount of air through the guide pipe part 70, the control unit 60 may adjust the opening and closing degree of the flow control valve 76, it is possible to adjust the movement amount of air.

According to the configuration as described above, the blast furnace slag waste heat recovery device 1 according to an embodiment recovers and reuses the waste heat generated during the cooling operation of the blast furnace slag 22, it is possible to reduce the hot water supply cost. .

In addition, since the maintenance work of the waste heat exchanger 40 can be facilitated by using the flow control valve 76 and the detachable part 110, the workability can be improved.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art to which the art belongs can make various modifications and other equivalent embodiments therefrom. I will understand.

In addition, the waste heat recovery device for blast furnace slag used in the steel mill was described as an example, but this is merely illustrative, the waste heat recovery device for blast furnace slag according to the present invention can be used in other factories for cooling the slag.

Therefore, the true technical protection scope of the present invention will be defined by the claims.

1: Waste heat recovery device for blast furnace slag
10: housing portion 12: storage case
20: slag supply line 22: blast furnace slag
24: Recycling slag 26: Water vapor
30: cooling injection unit 32: the first motor
34: guideway 36: coolant
40: heat exchanger for waste heat 41: heat exchanger body
42: hollow part 43: heat exchange tube
44: working fluid 45: inlet line
46: discharge pipe 47: the first temperature sensor unit
48: second temperature sensor unit 50: washing injection unit
52: transfer pipe 54: nozzle member
56: second motor 58: washing water
60: control unit 70: guide pipe unit
72: first guideway 74: second guideway
76: flow control valve 80: main injection unit
82: main motor 84: main injection pipe
86: Binary 90: Sub-injection unit
92: submotor 94: sub-injection pipe
100: storage tank 102: connector
110: removable portion 112: the first flange
114: second flange 116: fastening bolt
118: tightening nut

Claims (7)

A cooling spray unit for cooling the blast furnace slag by spraying cooling water on the blast furnace slag supplied into the housing part;
A guide pipe part for guiding air moving upwardly of the cooling jet part toward a storage tank provided outside the housing part;
A waste heat exchanger installed inside the guide pipe part and configured to exchange heat with air passing through the guide pipe part;
A flow control valve installed in the guide pipe part to control a flow of air moved to the waste heat exchanger; And
Installed between the flow control valve and the waste heat exchanger, waste heat recovery apparatus for blast furnace slag, characterized in that it comprises a detachable portion for separating and coupling the guide pipe.
According to claim 1, wherein the heat exchanger for waste heat,
A heat exchange body of a pipe shape installed along the inner side of the guide pipe part;
Installed along the inside of the heat exchange body, waste heat recovery apparatus for blast furnace slag, characterized in that it comprises a heat exchange pipe for guiding the movement of the working fluid is heat exchange.
The method of claim 2,
A first temperature sensor unit measuring a temperature of a working fluid supplied to the heat exchange tube and transferring a measured value to a controller; And
And a second temperature sensor unit for measuring a temperature of the working fluid discharged from the heat exchange tube and transferring a measured value to the controller.
The method of claim 2,
The waste heat recovery apparatus for blast furnace slag is installed in the hollow portion of the heat exchange body, further comprising a washing spray unit for spraying the washing water into the heat exchange body.
According to claim 4, The washing spray unit,
A conveying pipe for transporting the washing water along the hollow part; And
A waste heat recovery apparatus for blast furnace slag, characterized in that it comprises a nozzle member for forming a passage for spraying the washing water along the circumference of the conveying pipe.
6. The method according to any one of claims 1 to 5,
The waste heat recovery apparatus for blast furnace slag, characterized in that it further comprises a main injection unit for removing the foreign matter in the air by injecting a dust removal to the inside of the guide pipe portion located between the waste heat exchanger and the storage tank.
The method according to claim 6,
It is installed on the upper side of the cooling spray unit, the waste heat recovery apparatus for blast furnace slag, characterized in that it further comprises a sub-injection unit for removing the foreign matter in the air by injecting the dust removal.

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