Water cooling device for cooling wall of blast furnace hearth during medium repair

Abstract

The utility model provides a blast furnace hearth cooling wall water cooling device during medium repair, the cooling device comprises a plurality of cooling units and a micro-power water pump station, the plurality of cooling units are connected in sequence and encircle to form a hearth cooling wall; one cooling water pipe in the cooling unit is a unit water inlet pipe, the other cooling water pipe is a unit water outlet pipe, and the unit water inlet pipe, the other cooling water pipes and the unit water outlet pipe are sequentially connected end to end to form a passage for cooling water circulation; the unit water inlet pipe is connected with a water supply pipe of the micro-power water pump station, and the unit water outlet pipe is connected with a water return pipe of the micro-power water pump station. The cooling device is simple in overall implementation and low in manufacturing cost, and the maintenance quality of medium maintenance of the blast furnace is improved. In the middle repair period of the blast furnace, the hearth area cooling wall is always in cooling mode protection, damage of thermal stress to the hearth cooling wall, a furnace shell and a steel structure is eliminated, and the service life of the blast furnace cooling wall and hearth refractory materials is prolonged.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical engineering technology, and in particular to a water cooling device for the cooling wall of a blast furnace hearth during intermediate repairs. Background Technology

[0002] Mid-term repair of a blast furnace refers to maintenance work on the blast furnace without replacing the refractory materials and cooling walls in the hearth area. Currently, mid-term repairs of blast furnaces in China generally adopt the method of not removing residual iron from the hearth to reduce damage to the hearth refractory materials. The residual high-temperature molten iron and residual heat of slag remaining in the hearth can damage the cooling walls, furnace shell, and associated steel structures in the hearth area. Therefore, maintaining continuous water cooling of the hearth area cooling walls is an important task to protect the cooling walls and steel shell in the hearth area.

[0003] In existing technologies, the common approach is to maintain water cooling of the hearth area cooling walls while abandoning the maintenance and replacement of the entire blast furnace cooling walls. Since the damaged cooling walls cannot be replaced or repaired, the lifespan of the cooling walls above the tuyeres is greatly reduced, and the maintenance of the blast furnace water pump room is severely restricted.

[0004] Alternatively, before shutdown, a temporary large-scale water loop can be installed in the blast furnace base and tuyeres area, and the loop can be cut and connected in stages during routine maintenance. All the inlet and outlet water pipes of the hearth cooling wall can be connected to the water loop, and then the water in the loop can be circulated and cooled by gasification cooling or forced circulation via water pumps. This method requires extensive preparatory work before the mid-term overhaul, involves a large amount of work in fabricating the water loop, has a long construction period, requires many routine minor maintenance opportunities for pipe cutting and connection, and has high investment costs. Utility Model Content

[0005] The purpose of this utility model is to provide a water cooling device for the blast furnace hearth cooling wall during intermediate maintenance. By constructing a water cooling system that is separate from and independent of the original water cooling system of the blast furnace, uninterrupted water cooling protection of the blast furnace hearth cooling wall can be achieved.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A water-cooling device for the cooling wall of a blast furnace hearth during intermediate maintenance includes several cooling water pipes arranged circumferentially within the hearth cooling wall. The cooling device comprises multiple cooling units and a micro-powered water pump station. The multiple cooling units are sequentially connected and enclose the hearth cooling wall. Within each cooling unit, one cooling water pipe serves as the unit inlet pipe, and another as the unit outlet pipe. The unit inlet pipe, the other cooling water pipes, and the unit outlet pipe are sequentially connected end-to-end to form a passage for cooling water circulation. The unit inlet pipe is connected to the water supply pipe of the micro-powered water pump station, and the unit outlet pipe is connected to the return water pipe of the micro-powered water pump station.

[0008] Furthermore, in the aforementioned water cooling device for the blast furnace hearth cooling wall during intermediate maintenance, the hearth cooling wall comprises four layers of cooling walls, namely the bottom layer, the second layer, the third layer, the fourth layer, and the top layer. Each layer of the cooling wall has several vertically arranged cooling water sub-pipes. The corresponding two cooling water sub-pipes in two adjacent layers of the cooling wall are connected to each other. The multiple cooling water sub-pipes in the multi-layer cooling wall are sequentially connected to form the cooling water pipe.

[0009] Furthermore, in the aforementioned blast furnace hearth cooling wall water cooling device during the intermediate overhaul, four cooling units are provided, and the micro-power water pump station provides cooling water to the four cooling units respectively through four water supply pipes and four water return pipes.

[0010] Furthermore, in the aforementioned blast furnace hearth cooling wall water cooling device during the intermediate overhaul, the number of cooling water pipes in one cooling unit is an even number. The cooling water pipes are sequentially arranged from one side of the cooling unit to the other side as the 1st cooling water pipe, the 2nd cooling water pipe, the 3rd cooling water pipe, ..., the nth cooling water pipe. The 1st cooling water pipe is the unit inlet pipe, and the nth cooling water pipe is the unit outlet pipe. The unit inlet pipe, the other cooling water pipes, and the unit outlet pipe are all connected by flexible metal hoses.

[0011] Furthermore, in the aforementioned water-cooling device for the blast furnace hearth cooling wall during intermediate repairs, the micro-powered water pump station has a water supply capacity ≥50m³ for a single cooling unit. 3 / h, the total water supply capacity of the micro-powered water pump station is ≥200m³ / h. 3 / h.

[0012] Furthermore, in the aforementioned water cooling device for the blast furnace hearth cooling wall during intermediate repairs, the micro-powered water pump station is installed on the blast furnace tapping platform or arranged below the blast furnace base.

[0013] Furthermore, in the aforementioned water cooling device for the blast furnace hearth cooling wall during the intermediate overhaul, when there is a cooling water pipe that jumps to the height of the upper cooling wall below the highest cooling wall, the jump cooling water pipe is connected to the upper end of the adjacent cooling water pipe according to its number.

[0014] Analysis shows that this utility model discloses a water-cooling device for the blast furnace hearth cooling wall during intermediate repairs. This cooling device is simple to implement and has low manufacturing costs. Before the intermediate repair, there is no need to fabricate a water loop pipe for the blast furnace hearth cooling wall; only flexible metal hoses are required. During the intermediate repair, the cooling wall in the hearth area will not affect the normal replacement or maintenance of cooling walls in other areas, nor will it affect the equipment maintenance in the blast furnace pump room or the replacement of various types of water pipes in the circulating water system, thus improving the quality of blast furnace intermediate repairs. During the intermediate repair, the cooling wall in the hearth area is always in a protected cooling mode, eliminating the damage of thermal stress to the hearth cooling wall, furnace shell, and steel structure, and extending the service life of the blast furnace cooling wall and hearth refractory materials. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. Wherein:

[0016] Figure 1 A schematic diagram of the structure of an embodiment of this utility model.

[0017] Figure 2 A flowchart of an embodiment of the present invention.

[0018] Explanation of reference numerals in the attached diagram: 1. Unit inlet pipe; 2. Second cooling water pipe; 3. Third cooling water pipe; 4. Metal hose; 5. Fourth cooling water pipe; 6. Fifth cooling water pipe; 7. Unit outlet pipe; 8. Sixth cooling water pipe; 9. Exhaust pipe; 10. Water supply pipe; 11. Return water pipe; 12. Micro-power water pump station. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Various examples are provided by way of explanation of the present invention and not by way of limitation. In fact, those skilled in the art will recognize that modifications and variations can be made to the present invention without departing from the scope or spirit of the invention. For example, a feature shown or described as part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desirable that the present invention encompass such modifications and variations that fall within the scope of the appended claims and their equivalents.

[0020] In the description of this utility model, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," and "bottom," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and do not require that this utility model be constructed and operated in a specific orientation; therefore, they should not be construed as limitations on this utility model. The terms "connected," "linked," and "set up" used in this utility model should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a direct connection or an indirect connection through intermediate components; a wired connection, a radio connection, or a wireless communication signal connection. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.

[0021] The accompanying drawings illustrate one or more examples of the present invention. The detailed description uses numerals and letters to refer to features in the drawings. Similar or analogous reference numerals in the drawings and description have been used to refer to similar or analogous parts of the present invention. As used herein, the terms “first,” “second,” and “third,” etc., are used interchangeably to distinguish one component from another and are not intended to indicate the location or importance of individual components.

[0022] like Figures 1 to 2 As shown, according to an embodiment of this utility model, a water cooling device for the blast furnace hearth cooling wall during intermediate repairs is provided. Several cooling water pipes are arranged circumferentially within the hearth cooling wall, such as... Figure 1 As shown, the cooling device includes multiple cooling units and a micro-powered water pump station 12. The multiple cooling units are connected sequentially and enclose the hearth cooling wall. Within each cooling unit, one cooling water pipe is the unit inlet pipe 1, and another is the unit outlet pipe 7. Within a single cooling unit, the unit inlet pipe 1, other cooling water pipes, and the unit outlet pipe 7 are connected end-to-end to form a circulation path for cooling water. The unit inlet pipe 1 is connected to the water supply pipe 10 of the micro-powered water pump station 12, and the unit outlet pipe 7 is connected to the return pipe 11 of the micro-powered water pump station 12. This cooling device operates independently by constructing a micro-circulation water cooling system that is separate from the original blast furnace water cooling system. It provides uninterrupted water cooling protection for the blast furnace hearth cooling wall during intermediate maintenance. It features simple construction, short construction time, no impact on the replacement and maintenance of cooling walls in other areas, no impact on the shutdown and maintenance of blast furnace water pump room equipment, and extends the service life of the blast furnace hearth cooling wall. Furthermore, the blast furnace hearth cooling wall can be easily restored to its original state after the intermediate maintenance.

[0023] Furthermore, the furnace hearth cooling wall comprises four layers of cooling walls, namely the bottom cooling wall, the second cooling wall, the third cooling wall, the fourth cooling wall, and the top cooling wall. Each cooling wall has several vertically arranged cooling water sub-pipes. The corresponding two cooling water sub-pipes in two adjacent cooling walls are connected to each other, and the multiple cooling water sub-pipes in the multi-layer cooling wall are connected in sequence to form a single cooling water pipe.

[0024] Furthermore, four cooling units are provided, and the micro-power water pump station 12 provides cooling water to the four cooling units respectively through four water supply pipes 10 and four water return pipes 11. The micro-power water pump station 12 provides cooling water to the four cooling units respectively through four water supply pipes 10, and recovers the cooling water through four water return pipes 11, so as to realize uninterrupted water cooling of the cooling wall in the hearth area during the blast furnace overhaul.

[0025] Furthermore, the number of cooling water pipes in a cooling unit is even. The cooling water pipes are arranged sequentially from one side of the cooling unit to the other side as the 1st cooling water pipe, the 2nd cooling water pipe, the 3rd cooling water pipe, ..., the nth cooling water pipe. The 1st cooling water pipe is the unit inlet pipe 1, and the nth cooling water pipe is the unit outlet pipe 7. The unit inlet pipe 1, the other cooling water pipes, and the unit outlet pipe 7 are all connected by a flexible metal hose 4.

[0026] Furthermore, the water supply capacity of the micro-powered water pump station for each of the 12 pairs of individual cooling units is ≥50m³. 3 / h, the total water supply capacity of micro-powered water pump station 12 is ≥200m³ / h. 3 / h. Since the blast furnace is undergoing a shutdown and maintenance period, there is no new heat generated during smelting in the hearth. The micro-circulation water cooling system, formed by the micro-powered water pump station 12, water supply pipe 10, cooling water pipe, and return water pipe 11, only needs to cool the residual heat of the slag and iron remaining in the hearth after the blast furnace shutdown. Therefore, the water volume requirement is very small, and the water supply capacity of the micro-powered water pump to a single cooling unit only needs to be ≥50m³ / h. 3 / h, the total water supply capacity of the micro-powered water pump to all cooling units is ≥200m³ / h. 3 / h is sufficient. To reduce equipment size and floor space, micro-power water pumps should be selected with specifications and models as close as possible to the lower limit, while still meeting the water supply capacity.

[0027] Furthermore, since the highest point of the cooling wall in the blast furnace hearth area is less than 16m, ordinary water pumps can meet the head requirements. Therefore, the micro-power water pump station 12 can be set up on the blast furnace tapping platform, or arranged below the blast furnace foundation or in areas unrelated to blast furnace overhaul construction, ensuring the smooth progress of blast furnace overhaul.

[0028] Furthermore, when there is a cooling water pipe (jump pipe 9) in the lower cooling wall of the highest cooling wall that jumps to the height of the upper cooling wall, the jump cooling water pipe is connected to the upper end of the adjacent cooling water pipe according to the number.

[0029] The implementation method of the water cooling device for the blast furnace hearth cooling wall during the above-mentioned intermediate repair is as follows: Figure 2 As shown, it includes the following steps:

[0030] S1. Divide the hearth cooling wall into sections: When the blast furnace is shut down, the hearth cooling wall that does not need maintenance during the blast furnace overhaul is divided into four cooling units according to the principle of dividing the circumference of the hearth cross section into equal parts. Within a cooling unit, from one side to the other side, the cooling water pipes are numbered sequentially as follows: the first cooling water pipe, the second cooling water pipe, the third cooling water pipe, ..., the nth cooling water inlet pipe.

[0031] S2, Cooling water pipe connection in the cooling unit: After the blast furnace is shut down for maintenance, the lower and upper ends of the cooling water pipes are disconnected from the cooling wall water inlet system. The first cooling water pipe is used as the unit water inlet pipe 1. The lower end of the unit water inlet pipe 1 is connected to the water supply pipe 10 of the micro-power water pump station 12. The nth cooling water pipe is used as the unit water outlet pipe 7. The lower end of the unit water outlet pipe 7 is connected to the return water pipe 11 of the micro-power water pump station 12. The first cooling water pipe, other cooling water pipes in the cooling unit and the nth cooling water pipe are connected in sequence to form a passage for cooling water circulation.

[0032] When connecting the cooling water pipes within the cooling unit, the lower ends of the second cooling water pipe 2 and the third cooling water pipe 3 are connected using a metal flexible hose 4; the lower ends of the fourth cooling water pipe 5 and the fifth cooling water pipe 6 are connected using a metal flexible hose 4; ..., the lower ends of the (n-2)th cooling water pipe and the (n-1)th cooling water pipe are connected using a metal flexible hose 4. The upper ends of the unit inlet pipe 1 and the second cooling water pipe 2 are connected using a metal flexible hose 4; the upper ends of the third cooling water pipe 3 and the fourth cooling water pipe 5 are connected using a metal flexible hose 4; ..., the upper end of the (n-1)th cooling water pipe and the upper end of the unit outlet pipe 7 are connected using a metal flexible hose 4.

[0033] When the total number of cooling water pipes in a cooling unit is even, the first cooling water pipe is designated as the unit inlet pipe 1 and the last cooling water pipe is designated as the unit outlet pipe 7. When the total number of cooling water pipes in a cooling unit is odd, the last cooling water pipe is assigned to the next cooling unit, and the second-to-last cooling water pipe is designated as the unit outlet pipe 7.

[0034] If there is a cooling water pipe (jump pipe 9) that jumps to the height of the upper cooling wall below the highest cooling wall (the 4th cooling wall), the jump cooling water pipe is connected to the upper end of the adjacent cooling water pipe in numerical order. After all the cooling water pipes in the unit are paired and connected, the water supply pipe 10 of the micro-power water pump station 12 is connected to the unit inlet pipe 1, and the unit outlet pipe 7 is connected to the return water pipe 11 of the micro-power water pump. At this time, the independent micro-circulation water cooling system of the furnace hearth area cooling wall has been built.

[0035] In one embodiment of this utility model, such as Figure 1 As shown, the first cooling water pipe serves as the unit inlet pipe 1. The lower ends of the second and third cooling water pipes 2 and 3 are connected by a metal hose 4; the lower ends of the fourth, fifth, and sixth cooling water pipes 5 and 6 are connected by a metal hose 4; ..., the lower ends of the (n-2)th and (n-1)th cooling water pipes are connected by a metal hose 4. The upper ends of the unit inlet pipe 1 and the second and third cooling water pipes 2 are connected by a metal hose 4; ..., the upper ends of the sixth and ninth cooling water pipes 8 and the jump pipe 9 are connected by a metal hose 4; ..., the upper ends of the (n-1)th cooling water pipe and the unit outlet pipe 7 are connected by a metal hose 4. The unit inlet pipe 1 is connected to the micro-powered water pump station 12 via a water supply pipe 10, and the unit outlet pipe 7 is connected to the micro-powered water pump station 12 via a return pipe 11.

[0036] S3, Water supply cooling: Start the micro-power water pump station 12 to supply water and cool the furnace hearth cooling wall.

[0037] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects:

[0038] 1. The cooling device is simple to implement and has low manufacturing cost. Before the blast furnace hearth cooling wall is repaired, there is no need to make a water ring pipe. Only metal hose 4 needs to be prepared.

[0039] 2. During the blast furnace overhaul, the cooling wall in the hearth area will not affect the normal replacement or maintenance of the cooling wall in other areas, nor will it affect the equipment maintenance in the blast furnace water pump room or the replacement of various types of water pipes in the circulating water system, thus improving the maintenance quality of the blast furnace overhaul.

[0040] 3. During the blast furnace overhaul, the hearth cooling wall is always in cooling mode protection, which eliminates the damage of thermal stress to the hearth cooling wall, furnace shell and steel structure, and extends the service life of the blast furnace cooling wall and hearth refractory.

[0041] The above description is merely a preferred embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A water-cooling device for the cooling wall of a blast furnace hearth during intermediate repairs, wherein a plurality of cooling water pipes are arranged circumferentially within the cooling wall of the hearth, characterized in that, The cooling device includes multiple cooling units and a micro-powered water pump station, wherein, Multiple cooling units are connected in sequence and enclosed to form a furnace hearth cooling wall; Within the cooling unit, one cooling water pipe serves as the unit inlet pipe, and another cooling water pipe serves as the unit outlet pipe. The unit inlet pipe, the other cooling water pipes, and the unit outlet pipe are connected end to end in sequence to form a passage for cooling water circulation. The unit's inlet pipe is connected to the water supply pipe of the micro-powered water pump station, and the unit's outlet pipe is connected to the return pipe of the micro-powered water pump station.

2. The water cooling device for the blast furnace hearth cooling wall during intermediate repair as described in claim 1, characterized in that, The furnace hearth cooling wall comprises four layers of cooling walls, namely the bottom layer, the second layer, the third layer, the fourth layer, and the top layer. Each layer of the cooling wall has several cooling water sub-pipes vertically arranged inside. The corresponding two cooling water sub-pipes in two adjacent layers of the cooling wall are connected to each other. The multiple cooling water sub-pipes in the multi-layer cooling wall are connected in sequence to form the cooling water pipe.

3. The water cooling device for the blast furnace hearth cooling wall during intermediate repair as described in claim 1, characterized in that, The cooling unit is provided in four parts, and the micro-power water pump station provides cooling water to the four cooling units through four water supply pipes and four water return pipes respectively.

4. The water cooling device for the blast furnace hearth cooling wall during intermediate repair as described in claim 1, characterized in that, The number of cooling water pipes in a cooling unit is even. The cooling water pipes are arranged sequentially from one side of the cooling unit to the other side as the 1st cooling water pipe, the 2nd cooling water pipe, the 3rd cooling water pipe, ..., the nth cooling water pipe, wherein the 1st cooling water pipe is the unit inlet pipe and the nth cooling water pipe is the unit outlet pipe. The unit inlet pipe, the other cooling water pipes, and the unit outlet pipe are all connected by flexible metal hoses.

5. The water cooling device for the blast furnace hearth cooling wall during intermediate repair as described in claim 1, characterized in that, The micro-powered water pump station has a water supply capacity of ≥50m³ for a single cooling unit. 3 / h, the total water supply capacity of the micro-powered water pump station is ≥200m³ / h. 3 / h.

6. The water cooling device for the blast furnace hearth cooling wall during intermediate repair as described in claim 1, characterized in that, The micro-powered water pump station is set on the blast furnace tapping platform or arranged below the blast furnace base.

7. The water cooling device for the blast furnace hearth cooling wall during intermediate repair as described in claim 2, characterized in that, When there is a cooling water pipe that jumps to the height of the upper cooling wall below the highest cooling wall, the jump cooling water pipe is connected to the upper end of the adjacent cooling water pipe according to its number.

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