Energy-saving heating furnace for hot-rolling seamless steel pipe production

Abstract

This utility model relates to the field of energy-saving heating furnace technology, and discloses an energy-saving heating furnace for hot-rolled seamless steel pipe production. It includes a base plate, a furnace body fixedly connected to the top of the base plate, a connecting pipe fixedly connected to the top of the base plate, a waste heat recovery assembly installed on the top of the base plate, and a filter assembly installed inside the connecting pipe. The waste heat recovery assembly includes a flue gas heat exchanger, a fixing frame, and a U-shaped tube. The bottom of the flue gas heat exchanger is fixedly connected to the top of the base plate, and both ends of the fixing frame are fixedly connected to the inside of the flue gas heat exchanger. In this utility model, flue gas from inside the furnace body is introduced into the flue gas heat exchanger through the connecting pipe. Water is pumped from the water tank and sent to the U-shaped tube through the inlet pipe, allowing the water to fully exchange heat with the hot flue gas in the heat exchanger. After the water is returned to the water tank through the return pipe, the problem of direct discharge of waste heat from flue gas in traditional heating furnaces, leading to energy waste, is solved, thus improving the energy utilization efficiency of the heating furnace.

Description

Technical Field

[0001] This utility model relates to the field of energy-saving heating furnace technology, and in particular to an energy-saving heating furnace for hot-rolled seamless steel pipe production. Background Technology

[0002] In the production of hot-rolled seamless steel pipes, the heating furnace is one of the key pieces of equipment, mainly used to heat the steel billet to the plastic deformation temperature for subsequent rolling processing. Traditional heating furnaces generate a large amount of high-temperature flue gas during operation. This flue gas usually contains unutilized heat energy, and direct emission not only wastes energy but also increases environmental thermal pollution. With the increasing requirements for energy conservation and environmental protection, how to effectively recover and utilize the waste heat from heating furnace flue gas has become a key focus of the industry. Currently, some companies use waste heat boilers or air preheaters for heat recovery, but the equipment is complex, has high investment costs, and is difficult to integrate efficiently with existing heating furnace systems. Therefore, developing a compact, energy-efficient, and high-performance waste heat recovery system for heating furnaces is of great significance for reducing production costs and improving energy utilization.

[0003] In existing technologies, hot-rolled seamless steel pipe heating furnaces typically use gas or oil combustion to provide heat energy. The high-temperature flue gas after combustion is discharged directly through the flue or after simple dust removal. Some improved heating furnaces are equipped with heat exchange devices, such as shell-and-tube heat exchangers or radiant heat exchangers, to preheat the combustion air or heat the circulating water using the waste heat of the flue gas. These heat exchange devices usually use fixed filtration structures, such as metal mesh or ceramic filters, to intercept dust and iron oxide scale in the flue gas and prevent the heat exchanger from clogging. In addition, some systems use induced draft fans to force flue gas exhaust to enhance flue gas flow efficiency, but the overall heat recovery rate is still low, and the maintenance of the filtration structure is relatively cumbersome.

[0004] Existing heating furnaces have significant shortcomings in the utilization of waste heat from flue gas. This is mainly manifested in the fact that a large amount of waste heat in the high-temperature flue gas is not effectively recovered and is directly emitted into the atmosphere, resulting in low energy utilization. Due to the lack of an efficient and stable waste heat recovery system, traditional heating furnaces suffer severe heat loss, which not only increases fuel consumption and production costs but also exacerbates energy waste. Although some enterprises have attempted to adopt waste heat recovery devices, their practical application is limited by the complexity of the equipment and the difficulty of operation and maintenance. Therefore, an energy-saving heating furnace technology that is simple in structure, easy to maintain, and can efficiently recover waste heat from flue gas is needed to improve energy utilization efficiency and reduce production costs. To address these issues, an energy-saving heating furnace for hot-rolled seamless steel pipe production is proposed. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides an energy-saving heating furnace for the production of hot-rolled seamless steel pipes, which aims to improve the problem of direct emission of waste heat from flue gas in traditional heating furnaces, which leads to energy waste.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: an energy-saving heating furnace for hot-rolled seamless steel pipe production, comprising a bottom plate, a furnace body fixedly connected to the top of the bottom plate, a connecting pipe fixedly connected to the top of the bottom plate, a waste heat recovery component provided on the top of the bottom plate, and a filter component provided inside the connecting pipe; The waste heat recovery assembly includes a flue gas heat exchanger, a mounting frame, and a U-shaped tube. The bottom of the flue gas heat exchanger is fixedly connected to the top of the base plate. Both ends of the mounting frame are fixedly connected to the inside of the flue gas heat exchanger. An exhaust pipe is fixedly connected to the outer wall of the flue gas heat exchanger. The U-shaped tube is disposed inside the flue gas heat exchanger. The inner wall of the U-shaped tube is fixedly connected to the outer wall of the mounting frame. One end of the U-shaped tube is fixedly connected to a water inlet pipe, and the other end of the U-shaped tube is fixedly connected to a water return pipe. A water tank is fixedly connected to the top of the base plate, and a water pump is fixedly connected to the top of the base plate. The input end of the water pump is fixedly connected to the outer wall of the water tank and one end of the water inlet pipe. One end of the water return pipe is fixedly connected to the outer wall of the water tank.

[0007] As a further description of the above technical solution: The filter assembly includes a filter plate and a sealing strip. The outer wall of the filter plate is slidably connected to the inside of the connecting pipe, and the outer wall of the sealing strip is fixedly connected to the inside of the filter plate.

[0008] As a further description of the above technical solution: A handle is fixedly connected to the top of the filter plate, and a locking hole is fixedly connected to the side wall of the handle.

[0009] As a further description of the above technical solution: A hollow column is fixedly connected inside the connecting pipe, and a sliding column is slidably connected inside the hollow column, with the sliding column engaging with a locking hole.

[0010] As a further description of the above technical solution: One end of the sliding column is fixedly connected to a limiting block, and the outer wall of the limiting block is slidably connected inside the hollow column.

[0011] As a further description of the above technical solution: A pull block is fixedly connected to the outer wall of the limiting block, and the outer wall of the pull block is slidably connected inside the hollow column.

[0012] As a further description of the above technical solution: A fixing block is fixedly connected inside the hollow column, and a reset spring is provided inside the hollow column. One end of the reset spring is fixedly connected to the side wall of the limiting block, and the other end of the reset spring is fixedly connected to the side wall of the fixing block.

[0013] This utility model has the following beneficial effects: 1. In this utility model, the flue gas inside the furnace is introduced into the flue gas heat exchanger through a connecting pipe, and water is pumped out of the water tank and sent into the U-shaped tube through the water inlet pipe. After the water fully exchanges heat with the hot flue gas in the heat exchanger, it returns to the water tank through the return pipe. This achieves the effect of recovering the waste heat of the heating furnace flue gas for heating water, solving the problem of direct discharge of waste heat of traditional heating furnace flue gas, which leads to energy waste, and improving the energy utilization efficiency of the heating furnace.

[0014] 2. In this utility model, impurities in the flue gas are intercepted and filtered by the filter plate to prevent them from entering the flue gas heat exchanger. By pulling the pull block, the limiting block moves inside the hollow column, and the return spring is squeezed to make the sliding column disengage from the filter plate's locking hole. Then, the filter plate can be quickly disassembled by pulling the handle. This achieves convenient cleaning of the filter plate and maintains the filtration effect. It solves the problem that traditional fixed filter structures are difficult to clean due to impurities, resulting in filtration failure and inconvenient equipment maintenance, and improves the convenience of cleaning and replacing the filter plate. Attached Figure Description

[0015] Figure 1 This is a three-dimensional schematic diagram of the energy-saving heating furnace for hot-rolled seamless steel pipe production proposed in this utility model; Figure 2 This is a schematic diagram of the flue gas heat exchanger structure of the energy-saving heating furnace for hot-rolled seamless steel pipe production proposed in this utility model. Figure 3 This is a schematic diagram of the filter plate structure of the energy-saving heating furnace for hot-rolled seamless steel pipe production proposed in this utility model. Figure 4 This is a schematic diagram of the connecting pipeline structure of the energy-saving heating furnace for hot-rolled seamless steel pipe production proposed in this utility model. Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0016] Legend: 1. Base plate; 2. Furnace body; 3. Connecting pipes; 4. Flue gas heat exchanger; 5. Water tank; 6. Exhaust pipe; 7. Fixing frame; 8. U-shaped pipe; 9. Inlet pipe; 10. Return pipe; 11. Water pump; 12. Filter plate; 13. Handle; 14. Sealing strip; 15. Clip hole; 16. Hollow column; 17. Sliding column; 18. Limiting block; 19. Pull block; 20. Fixing block; 21. Return spring. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0018] Reference Figures 1-2 An embodiment of this utility model provides an energy-saving heating furnace for hot-rolled seamless steel pipe production, including a base plate 1, a furnace body 2 fixedly connected to the top of the base plate 1, the furnace body 2 being used for heating steel pipes and providing a closed high-temperature environment, a connecting pipe 3 fixedly connected to the top of the base plate 1, the connecting pipe 3 being used for conveying high-temperature flue gas and connecting to a waste heat recovery system, a waste heat recovery component being provided on the top of the base plate 1, the waste heat recovery component being used for recovering waste heat from flue gas and improving energy utilization, and a filter component being provided inside the connecting pipe 3, the filter component being used for removing particulate impurities in the flue gas and protecting downstream equipment; The waste heat recovery assembly includes a flue gas heat exchanger 4, a mounting bracket 7, and a U-shaped tube 8. The flue gas heat exchanger 4 is used for heat exchange between high-temperature flue gas and cooling water. Its bottom is fixedly connected to the top of the base plate 1. The mounting bracket 7 supports the U-shaped tube 8 and keeps it stable. Both ends are fixedly connected inside the flue gas heat exchanger 4. An exhaust pipe 6 is fixedly connected to the outer wall of the flue gas heat exchanger 4. The exhaust pipe 6 is used to discharge the cooled flue gas. The U-shaped tube 8 is used to increase the heat exchange area and improve the heat exchange efficiency. It is installed inside the flue gas heat exchanger 4. The inner wall of the U-shaped tube 8 is fixedly connected to the outer wall of the mounting bracket 7. One end of the U-shaped tube 8 is fixedly connected to... The inlet pipe 9 is used to supply cooling water to the U-shaped pipe 8. The other end of the U-shaped pipe 8 is fixedly connected to the return pipe 10, which is used to output heated water and recycle it. The top of the base plate 1 is fixedly connected to the water tank 5, which is used to store cooling water and provide a circulating water source. The top of the base plate 1 is fixedly connected to the water pump 11, which is used to drive the cooling water circulation. The input end of the water pump 11 is fixedly connected to the outer wall of the water tank 5, and the output end of the water pump 11 is fixedly connected to one end of the inlet pipe 9. One end of the return pipe 10 is fixedly connected to the outer wall of the water tank 5, which is used to return the heated water to the water tank 5.

[0019] Reference Figures 3-5The filter assembly includes a filter plate 12 and a sealing strip 14. The filter plate 12 is used to intercept impurities in the flue gas and prevent clogging of downstream equipment. Its outer wall is slidably connected to the inside of the connecting pipe 3. The sealing strip 14 is used to enhance the sealing between the filter plate 12 and the connecting pipe 3 and reduce flue gas leakage. Its outer wall is fixedly connected to the inside of the filter plate 12. A handle 13 is fixedly connected to the top of the filter plate 12. The handle 13 is used to facilitate the installation and removal of the filter plate 12. A locking hole 15 is fixedly connected to the side wall of the handle 13. The locking hole 15 is used to cooperate with the sliding column 17 to fix the filter plate 12. A hollow column 16 is fixedly connected inside the connecting pipe 3. The hollow column 16 is used to accommodate the sliding column 17 and provide guidance. The sliding column 17 is slidably connected inside the hollow column 16. The sliding column 17 is used to lock or release the filter plate. The filter plate 12 engages with the locking hole 15. One end of the sliding column 17 is fixedly connected to the limiting block 18, which limits the movement range of the sliding column 17. The outer wall of the limiting block 18 is slidably connected to the inside of the hollow column 16. A pull block 19 is fixedly connected to the outer wall of the limiting block 18, which is used to manually operate the movement of the sliding column 17. The outer wall of the pull block 19 is slidably connected to the inside of the hollow column 16. A fixing block 20 is fixedly connected inside the hollow column 16, which supports the reset spring 21. The reset spring 21 is provided inside the hollow column 16, which provides elastic reset force to make the sliding column 17 automatically return to its position and maintain the engaged state. One end of the reset spring 21 is fixedly connected to the side wall of the limiting block 18, and the other end of the reset spring 21 is fixedly connected to the side wall of the fixing block 20.

[0020] Working Principle: During operation, the high-temperature flue gas generated by combustion within the furnace body 2 enters the flue gas heat exchanger 4 through the connecting pipe 3. As the flue gas flows within the heat exchanger 4, it undergoes efficient heat exchange with the cooling water inside the U-shaped tube 8. The U-shaped tube 8 employs a multi-pass design, increasing the heat exchange area and ensuring that the heat from the high-temperature flue gas is fully transferred to the water flow. The cooling water is drawn from the water tank 5 by the water pump 11, enters the U-shaped tube 8 through the inlet pipe 9, absorbs heat and increases in temperature, then returns to the water tank 5 through the return pipe 10, forming a closed-loop cycle. This achieves the recovery and utilization of waste heat from the flue gas. Before entering the flue gas heat exchanger 4, the flue gas needs to undergo... The filter plate 12 is installed in the connecting pipe 3 via a sliding connection to prevent impurities from accumulating and affecting heat exchange efficiency. Its internal sealing strip 14 ensures flue gas leakage. When the filter plate 12 needs to be cleaned due to dust accumulation, the pull block 19 is pulled outward to drive the sliding column 17 to overcome the elastic force of the return spring 21 and disengage from the locking hole 15. The filter plate 12 can then be pulled out through the handle 13 for cleaning or replacement. After cleaning, the filter plate 12 is pushed back to its original position, and the return spring 21 pushes the sliding column 17 to lock into the locking hole 15 to complete the fixation. This achieves the effect of portable cleaning and replacement of the filter plate 12.

[0021] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. Energy-saving heating furnace for hot-rolling seamless steel pipe production, comprising a bottom plate (1), characterized in that: The bottom plate (1) is fixedly connected to the furnace body (2), the bottom plate (1) is fixedly connected to the connecting pipe (3), the bottom plate (1) is provided with a waste heat recovery component, and the connecting pipe (3) is provided with a filter component inside; The waste heat recovery assembly includes a flue gas heat exchanger (4), a mounting bracket (7), and a U-shaped tube (8). The bottom of the flue gas heat exchanger (4) is fixedly connected to the top of the base plate (1). Both ends of the mounting bracket (7) are fixedly connected to the inside of the flue gas heat exchanger (4). An exhaust pipe (6) is fixedly connected to the outer wall of the flue gas heat exchanger (4). The U-shaped tube (8) is disposed inside the flue gas heat exchanger (4), and the inner wall of the U-shaped tube (8) is fixedly connected to the outer wall of the mounting bracket (7). One end of the U-shaped pipe (8) is fixedly connected to the inlet pipe (9), and the other end of the U-shaped pipe (8) is fixedly connected to the return pipe (10). The top of the base plate (1) is fixedly connected to the water tank (5), and the top of the base plate (1) is fixedly connected to the water pump (11). The input end of the water pump (11) is fixedly connected to the outer wall of the water tank (5), and the input end of the water pump (11) is fixedly connected to one end of the inlet pipe (9). The end of the return pipe (10) is fixedly connected to the outer wall of the water tank (5).

2. The energy-saving heating furnace for hot-rolled seamless steel pipe production according to claim 1, characterized in that: The filter assembly includes a filter plate (12) and a sealing strip (14). The outer wall of the filter plate (12) is slidably connected to the inside of the connecting pipe (3), and the outer wall of the sealing strip (14) is fixedly connected to the inside of the filter plate (12).

3. The energy-saving heating furnace for hot-rolled seamless steel pipe production according to claim 2, characterized in that: The top of the filter plate (12) is fixedly connected to a handle (13), and the side wall of the handle (13) is fixedly connected to a locking hole (15).

4. The energy-saving heating furnace for hot-rolled seamless steel pipe production according to claim 1, characterized in that: A hollow column (16) is fixedly connected inside the connecting pipe (3), and a sliding column (17) is slidably connected inside the hollow column (16). The sliding column (17) and the locking hole (15) are engaged.

5. The energy-saving heating furnace for hot-rolled seamless steel pipe production according to claim 4, characterized in that: One end of the sliding column (17) is fixedly connected to a limiting block (18), and the outer wall of the limiting block (18) is slidably connected inside the hollow column (16).

6. The energy-saving heating furnace for hot-rolled seamless steel pipe production according to claim 5, characterized in that: The outer wall of the limiting block (18) is fixedly connected to a pull block (19), and the outer wall of the pull block (19) is slidably connected inside the hollow column (16).

7. The energy-saving heating furnace for hot-rolled seamless steel pipe production according to claim 6, characterized in that: A fixing block (20) is fixedly connected inside the hollow column (16), and a reset spring (21) is provided inside the hollow column (16). One end of the reset spring (21) is fixedly connected to the side wall of the limiting block (18), and the other end of the reset spring (21) is fixedly connected to the side wall of the fixing block (20).

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