A dual-mode heat exchanger structure and working method for a hot blast stove

Abstract

This invention relates to the field of heat exchange equipment technology, and provides a dual-mode heat exchanger structure and operating method for a hot air furnace. The structure includes a housing, and further includes: a heat insulation component, comprising a first horizontal plate and two first vertical plates; a heat conduction component, comprising a second horizontal plate and two second vertical plates; a first exhaust pipe, a first inlet pipe, a second exhaust pipe, and two second inlet pipes. The operating method includes a heat exchange mode and a direct-flow mode. The heat exchange mode includes the following steps: S1, flue gas passes through the first horizontal cavity, the first vertical cavity, the second vertical cavity, and the second horizontal cavity successively, and is discharged from the second exhaust pipe; S2, cold air absorbs the heat from the flue gas in the second vertical cavity to become hot air, which is discharged from the second exhaust pipe and enters the drying chamber. The direct-flow mode includes the following steps: S3, the two first vertical plates move upwards; S4, flue gas is discharged from the second exhaust pipe and enters the drying chamber. This invention can improve the drying efficiency of materials.

Description

Technical Field

[0001] This invention relates to the field of heat exchange equipment technology, specifically to a dual-mode heat exchanger structure and operating method for a hot blast stove. Background Technology

[0002] Hot blast stoves are thermal power machines that began to be widely used in my country in the late 1970s. They have become a replacement for electric heat sources and traditional steam power sources in many industries. Hot blast stoves come in many varieties and series, and are classified into hand-fired and machine-fired types according to the method of coal feeding, and into coal, oil, and gas stoves according to the type of fuel.

[0003] Hot air furnaces are often used in conjunction with heat exchangers and drying boxes. The flue gas discharged from the hot air furnace and the cold air discharged from the fan exchange heat in the heat exchanger. After absorbing heat, the cold air enters the drying box to dry the materials inside.

[0004] Traditional heat exchangers only have one working mode: exchanging heat between the flue gas discharged from the hot air furnace and the cold air discharged from the fan. However, this mode is not the most efficient for drying materials. When the materials in the dryer do not react with the flue gas discharged from the hot air furnace, directly using the flue gas to dry the materials is the most efficient method. If the heat exchanger is removed and the flue gas outlet of the hot air furnace is connected to the drying box, it will waste a lot of time, increase the labor intensity of the workers, and reduce the overall drying efficiency. Summary of the Invention

[0005] In view of the deficiencies in the prior art, the purpose of this invention is to provide a dual-mode heat exchanger structure and operating method for hot air furnaces, which can improve the drying efficiency of materials.

[0006] To achieve the above objectives, according to a first aspect of the present invention, a dual-mode heat exchanger structure for a hot air furnace is disclosed, used in conjunction with a drying oven, comprising a housing, and further comprising: A heat insulation assembly includes a first horizontal plate and two first vertical plates. The first horizontal plate is disposed below the box body and has a first horizontal cavity inside. The two first vertical plates are respectively inserted into the interior of the two sides of the box body. Both first vertical plates are fixedly connected to the first horizontal plate. The interior of the first vertical plate forms a first vertical cavity, which communicates with the first horizontal cavity. A heat-conducting assembly includes a second horizontal plate and two second vertical plates. The second horizontal plate is disposed above the housing and has a second horizontal cavity inside. The two second vertical plates are respectively inserted into the interior of both sides of the housing and divide the interior of the housing into a first heat exchange cavity and two second heat exchange cavities. The two second heat exchange cavities are respectively located on both sides of the first heat exchange cavity. Both second vertical plates are fixedly connected to the second horizontal plate. A connecting pipe is fixedly installed on the lower part of the second vertical plate, and the connecting pipe connects the second heat exchange cavities on both sides to the first heat exchange cavity. The part of the second vertical plate inside the housing is made of a heat-conducting material. A second vertical cavity is formed inside the second vertical plate and communicates with the second horizontal cavity. The second vertical plate is in sliding contact with the inner wall of the first vertical cavity on the same side. The system comprises a first exhaust pipe, a first intake pipe, a second exhaust pipe, and two second intake pipes. The first exhaust pipe is connected to the first heat exchange chamber, the first intake pipe is connected to the first horizontal chamber, the second exhaust pipe is connected to the second horizontal chamber, and the two second intake pipes are respectively connected to the two second heat exchange chambers.

[0007] Furthermore, the stirring assembly includes a rotating shaft and multiple blades. The rotating shaft is disposed inside the first heat exchange chamber and its two ends are rotatably connected to the inner wall of the housing. The multiple blades are fixedly mounted on the rotating shaft.

[0008] Furthermore, the connecting pipes on the two second vertical plates are located on the front and rear sides of the rotating shaft, respectively.

[0009] Furthermore, it also includes a lifting mechanism, which includes a rotating rod, a guide shaft, and a motor. The first end of the rotating rod is rotatably connected to the outer wall of the housing, and the second end of the rotating rod is a free end. A guide groove extending along its length is opened on the rotating rod. The guide shaft is connected to the first vertical plate and also slides in contact with the inner wall of the guide groove. The motor is used to control the rotation of the first end of the rotating rod.

[0010] Furthermore, the guide shaft is rotatably connected to the first vertical plate.

[0011] Furthermore, a first sealing gasket is fixedly installed on the box body, the first sealing gasket is used to achieve a seal between the first vertical plate and the box body, and a second sealing gasket is fixedly installed on the first vertical plate, the second sealing gasket is used to achieve a seal between the first vertical cavity and the second vertical plate.

[0012] According to a second aspect of the present invention, a method of operation is disclosed, comprising a heat exchange mode and a direct-flow mode; The heat exchange mode includes the following steps: S1. After passing through the first horizontal cavity, the first vertical cavity, the second vertical cavity, and the second horizontal cavity in sequence, the flue gas is discharged from the second outlet pipe. S2. Cold air passes through the second heat exchange chamber, the connecting pipe and the first heat exchange chamber in succession, and absorbs the heat of the flue gas in the second vertical chamber along the way to become hot air. The hot air is discharged from the second exhaust pipe and enters the drying oven. The straight-through mode includes the following steps: S3. The two first vertical plates move upward until the two second vertical plates are respectively hidden in the first vertical cavity; S4. After passing through the first horizontal cavity, the second vertical cavity, and the second horizontal cavity, the flue gas is discharged from the second exhaust pipe and enters the drying chamber.

[0013] The beneficial effects of this invention are as follows: This invention provides a dual-mode heat exchanger structure and operating method for a hot air furnace. By controlling the lifting and lowering of two first vertical plates, the structure can switch between heat exchange mode and direct-flow mode. The switching is based on whether the material in the drying chamber reacts with the flue gas. When the structure is in heat exchange mode, the flue gas discharged from the hot air furnace and the cold air blown out by the fan can exchange heat, and the cold air absorbs heat to dry the material in the drying chamber. When the structure is in direct-flow mode, the flue gas discharged from the hot air furnace directly passes through the structure to dry the material in the drying chamber. The switching speed is fast, improving the drying efficiency of the material. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the present invention from a first perspective; Figure 2 This is a three-dimensional structural diagram of the present invention from a second perspective. Figure 3 This is a front view structural diagram of the present invention; Figure 4 This is a schematic diagram of the internal cross-sectional structure of the present invention; Figure 5 for Figure 4 A magnified structural diagram of part A in the middle.

[0015] Reference numerals: 10-Box body, 11-First heat exchange chamber, 12-Second heat exchange chamber, 20-Insulation component, 21-First horizontal plate, 22-First vertical plate, 23-First horizontal cavity, 24-First vertical cavity, 30-Heat conduction component, 31-Second horizontal plate, 32-Second vertical plate, 33-Second horizontal cavity, 34-Second vertical cavity, 35-Connecting pipe, 41-First air outlet pipe, 42-First air inlet pipe, 43-Second air outlet pipe, 44-Second air inlet pipe, 45-First valve, 46-Second valve, 47-Third valve, 48-Fourth valve, 49-U-shaped tube, 50-Lifting mechanism, 51-Rotating rod, 52-Guide shaft, 53-Motor, 54-Guide groove, 55-First sealing gasket, 56-Second sealing gasket. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0017] In this application, unless otherwise expressly specified and limited, the terms "connection" and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0018] In the description of this application, it should be understood that the terms "longitudinal", "horizontal", "level", "top", "bottom", "upper", "lower", "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0019] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly defined.

[0020] like Figures 1-5 As shown, the present invention provides a dual-mode heat exchanger structure for a hot air furnace, which is used in conjunction with a hot air furnace and a drying box. It includes a box body 10, and also includes a heat insulation component 20, a heat conduction component 30, a first air outlet pipe 41, a first air inlet pipe 42, a second air outlet pipe 43, and two second air inlet pipes 44.

[0021] The thermal insulation assembly 20 includes a first horizontal plate 21 and two first vertical plates 22. The first horizontal plate 21 is disposed below the housing 10 and has a first horizontal cavity 23 inside. The two first vertical plates 22 are respectively inserted into the interior of the two sides of the housing 10, and both first vertical plates 22 are fixedly connected to the first horizontal plate 21, forming a U-shaped structure between the two first vertical plates 22 and the first horizontal plate 21. A first vertical cavity 24 is formed inside the first vertical plate 22, and the first vertical cavity 24 communicates with the first horizontal cavity 23.

[0022] The heat-conducting assembly 30 includes a second horizontal plate 31 and two second vertical plates 32. The second horizontal plate 31 is positioned above the housing 10 and has a second horizontal cavity 33 inside. The two second vertical plates 32 are respectively inserted into the interior of the two sides of the housing 10, dividing the interior of the housing 10 into a first heat exchange cavity 11 and two second heat exchange cavities 12, which are located on both sides of the first heat exchange cavity 11. Both second vertical plates 32 are fixedly connected to the second horizontal plate 31, forming a U-shaped structure between them. A connecting pipe 35 is fixedly installed on the lower part of the second vertical plate 32, connecting the two second heat exchange cavities 12 to the first heat exchange cavity 11. The portion of the second vertical plate 32 located inside the housing 10 is made of a heat-conducting material. The interior of the second vertical plate 32 forms a second vertical cavity 34, which is connected to the second horizontal cavity 33. The second vertical plate 32 slides in contact with the inner wall of the first vertical cavity 24 on the same side.

[0023] The system comprises a first exhaust pipe 41, a first intake pipe 42, a second exhaust pipe 43, and two second intake pipes 44. The first exhaust pipe 41 is connected to the first heat exchange chamber 11 via a U-shaped tube 49 and has a first valve 45. The first intake pipe 42 is connected to the first horizontal chamber 23, and the second exhaust pipe 43 has a second valve 46. The second exhaust pipe 43 is connected to the second horizontal chamber 33 and has a third valve 47. The two second intake pipes 44 are respectively connected to the two second heat exchange chambers 12 and have a fourth valve 48.

[0024] Preferably, the portions of the housing 10, the first horizontal plate 21, the first vertical plate 22, the second horizontal plate 31, and the second vertical plate 32 located outside the housing 10 are made of heat-insulating material.

[0025] This structure has two operating modes: heat exchange mode and direct-flow mode. The heat exchange mode is suitable for scenarios where the flue gas from the hot air furnace reacts with the materials inside the drying chamber. The direct-flow mode is suitable for scenarios where the flue gas from the hot air furnace does not react with the materials inside the drying chamber.

[0026] In heat exchange mode, the first valve 45, the second valve 46, the third valve 47, and the fourth valve 48 are all in the open state. The specific working process is as follows: First, the flue gas discharged from the hot air furnace passes through the first inlet pipe 42, the first horizontal cavity 23, the first vertical cavity 24, the second vertical cavity 34, and the second horizontal cavity 33 in sequence, and is discharged from the second outlet pipe 43. Then, the cold air blown by the fan passes through the second inlet pipe 44, the second heat exchange cavity 12, the connecting pipe 35, and the first heat exchange cavity 11 in sequence, and absorbs the heat of the flue gas in the second vertical cavity 34 during contact with the part of the second vertical plate 32 located inside the box 10, becoming hot air. The hot air is discharged from the second outlet pipe 43 and enters the drying box to dry the material.

[0027] Since the flue gas discharged from the hot air furnace reacts with the material in the drying chamber, this mode uses cold air blown out by the fan to exchange heat with the flue gas discharged from the hot air furnace, absorbing the heat of the flue gas to become hot air, which is then used to dry the material.

[0028] In direct-flow mode, the first valve 45 and the fourth valve 48 are closed, while the second valve 46 and the third valve 47 are open. The specific working process is as follows: the flue gas discharged from the hot air furnace passes successively through the first inlet pipe 42, the first horizontal chamber 23, the first vertical chamber 24, the second vertical chamber 34, and the second horizontal chamber 33, before exiting through the second outlet pipe 43 and directly entering the drying chamber to dry the material, eliminating the need for heat exchange and drying the material with the fastest efficiency.

[0029] Since the flue gas discharged from the hot air furnace does not react with the materials in the drying chamber, this mode directly sends the flue gas discharged from the hot air furnace into the drying chamber to dry the materials.

[0030] It is worth noting that this invention, based on whether the material inside the drying chamber reacts with the flue gas, switches between heat exchange mode and direct flow mode to dry the material with the highest efficiency. Furthermore, it does not require disassembly throughout the process, saving considerable time, reducing the workload of workers, and improving overall drying efficiency.

[0031] The design of the second vertical plate 32 allows the cold air to come into contact with it twice, once in the second heat exchange chamber 12 and once in the first heat exchange chamber 11. This prolongs the heat exchange time, increases the heat exchange contact area, and improves the heat exchange effect. The design of the connecting pipe 35 allows the cold air in the second heat exchange chamber 12 to flow slowly into the first heat exchange chamber 11, further prolonging the heat exchange time and improving the heat exchange effect.

[0032] In one embodiment, the stirring assembly includes a rotating shaft and multiple blades. The rotating shaft is longitudinally disposed within the first heat exchange chamber 11, and both ends are rotatably connected to the inner wall of the housing 10. The multiple blades are fixedly mounted on the rotating shaft.

[0033] When the cold air in the second heat exchange chamber 12 enters the first heat exchange chamber 11 through the connecting pipe 35, it can blow the blades, thereby driving the rotating shaft and blades to rotate. On the one hand, it blows the cold air onto the outer wall of the second vertical plate 32, improving the heat exchange effect; on the other hand, it can stir the airflow in the first heat exchange chamber 11, making the heat distribution uniform and further improving the heat exchange effect.

[0034] In one embodiment, the connecting pipes 35 on the two second vertical plates 32 are located on the front and rear sides of the rotating shaft, respectively. In this way, the cold air blown out from the connecting pipes 35 will blow the blades on the front and rear sides of the rotating shaft, thereby better driving the blades and the rotating shaft to rotate and stirring the airflow in the first heat exchange chamber 11 more quickly.

[0035] In one embodiment, a lifting mechanism 50 is further included, comprising a rotating rod 51, a guide shaft 52, and a motor 53. The first end of the rotating rod 51 is rotatably connected to the outer wall of the housing 10, and the second end of the rotating rod 51 is a free end. A guide groove 54 extending along the length of the rotating rod 51 is formed on it. The guide shaft 52 is connected to the first vertical plate 22 and also slides in contact with the inner wall of the guide groove 54. The motor 53 is fixedly mounted on the outer wall of the housing 10 and is used to control the rotation of the first end of the rotating rod 51.

[0036] When the present invention needs to switch from heat exchange mode to direct flow mode, motor 53 controls the first end of rotating rod 51 to rotate. At this time, the second end of rotating rod 51 swings upward. Under the action of guide groove 54 and guide shaft 52, the first vertical plate 22 will move upward until the two second vertical plates 32 are respectively hidden in the first vertical cavity 24. Since the first vertical plate 22 is made of heat insulation material, the heat will not be lost excessively when the flue gas passes through the second vertical cavity 34.

[0037] Conversely, the present invention can switch from heat exchange mode to direct flow mode.

[0038] In one embodiment, the guide shaft 52 is rotatably connected to the first vertical plate 22 to reduce friction between the guide shaft 52 and the inner wall of the guide groove 54.

[0039] In one embodiment, a first sealing gasket 55 is fixedly installed on the housing 10, and the first sealing gasket 55 is used to seal between the first vertical plate 22 and the housing 10. A second sealing gasket 56 is fixedly installed on the first vertical plate 22, and the second sealing gasket 56 is used to seal between the first vertical cavity 24 and the second vertical plate 32.

[0040] According to a second aspect of the invention, a method of operation is disclosed, comprising a heat exchange mode and a straight-through mode.

[0041] The heat exchange mode includes the following steps: S1. The first valve 45, the second valve 46, the third valve 47, and the fourth valve 48 are all in the open state. The flue gas discharged from the hot blast furnace passes through the first inlet pipe 42, the first horizontal cavity 23, the first vertical cavity 24, the second vertical cavity 34, and the second horizontal cavity 33 in sequence, and is then discharged from the second outlet pipe 43.

[0042] S2. The cold air blown out by the fan passes through the second air inlet pipe 44, the second heat exchange chamber 12, the connecting pipe 35 and the first heat exchange chamber 11 in succession. During the process of contacting the part of the second vertical plate 32 located inside the box body 10, it absorbs the heat of the flue gas in the second vertical chamber 34 and becomes hot air. The hot air is discharged from the second air outlet pipe 43 and enters the drying box to dry the material.

[0043] The pass-through mode includes the following steps: S3. The first valve 45 and the fourth valve 48 are in the closed state, and the second valve 46 and the third valve 47 are in the open state. The motor 53 controls the first end of the rotating rod 51 to rotate. At this time, the second end of the rotating rod 51 swings upward. Under the action of the guide groove 54 and the guide shaft 52, the first vertical plate 22 will move upward until the two second vertical plates 32 are respectively hidden in the first vertical cavity 24.

[0044] S4. The flue gas discharged from the hot air furnace passes through the first inlet pipe 42, the first horizontal cavity 23, the first vertical cavity 24, the second vertical cavity 34, and the second horizontal cavity 33 in sequence, and then exits from the second outlet pipe 43 and directly enters the drying chamber to dry the material. Since the first vertical plate 22 is made of heat-insulating material, the heat will not be lost excessively when the flue gas passes through the second vertical cavity 34.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or basic characteristics. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A dual-mode heat exchanger structure for a hot air furnace, used in conjunction with a drying oven, comprising a chamber, characterized in that: Also includes: A heat insulation assembly includes a first horizontal plate and two first vertical plates. The first horizontal plate is disposed below the box body and has a first horizontal cavity inside. The two first vertical plates are respectively inserted into the interior of the two sides of the box body. Both first vertical plates are fixedly connected to the first horizontal plate. The interior of the first vertical plate forms a first vertical cavity, which communicates with the first horizontal cavity. A heat-conducting assembly includes a second horizontal plate and two second vertical plates. The second horizontal plate is disposed above the housing and has a second horizontal cavity inside. The two second vertical plates are respectively inserted into the interior of both sides of the housing and divide the interior of the housing into a first heat exchange cavity and two second heat exchange cavities. The two second heat exchange cavities are respectively located on both sides of the first heat exchange cavity. Both second vertical plates are fixedly connected to the second horizontal plate. A connecting pipe is fixedly installed on the lower part of the second vertical plate, and the connecting pipe connects the second heat exchange cavities on both sides to the first heat exchange cavity. The part of the second vertical plate inside the housing is made of a heat-conducting material. A second vertical cavity is formed inside the second vertical plate and communicates with the second horizontal cavity. The second vertical plate is in sliding contact with the inner wall of the first vertical cavity on the same side. The system comprises a first exhaust pipe, a first intake pipe, a second exhaust pipe, and two second intake pipes. The first exhaust pipe is connected to the first heat exchange chamber, the first intake pipe is connected to the first horizontal chamber, the second exhaust pipe is connected to the second horizontal chamber, and the two second intake pipes are respectively connected to the two second heat exchange chambers.

2. The dual-mode heat exchanger structure for a hot blast stove according to claim 1, characterized in that: The stirring assembly includes a rotating shaft and multiple blades. The rotating shaft is disposed inside the first heat exchange chamber and its two ends are rotatably connected to the inner wall of the housing. The multiple blades are fixedly mounted on the rotating shaft.

3. The dual-mode heat exchanger structure for a hot blast stove according to claim 2, characterized in that: The connecting pipes on the two second vertical plates are located on the front and rear sides of the rotating shaft, respectively.

4. The dual-mode heat exchanger structure for a hot blast stove according to claim 3, characterized in that: It also includes a lifting mechanism, which includes a rotating rod, a guide shaft, and a motor. The first end of the rotating rod is rotatably connected to the outer wall of the housing, and the second end of the rotating rod is a free end. A guide groove extending along its length is opened on the rotating rod. The guide shaft is connected to the first vertical plate and also slides in contact with the inner wall of the guide groove. The motor is used to control the rotation of the first end of the rotating rod.

5. The dual-mode heat exchanger structure for a hot blast stove according to claim 4, characterized in that: The guide shaft is rotatably connected to the first vertical plate.

6. The dual-mode heat exchanger structure for a hot blast stove according to claim 1, characterized in that: A first sealing gasket is fixedly installed on the box body, which is used to achieve a seal between the first vertical plate and the box body. A second sealing gasket is fixedly installed on the first vertical plate, which is used to achieve a seal between the first vertical cavity and the second vertical plate.

7. A working method applied to the dual-mode heat exchanger structure for the hot blast stove as described in claim 5, characterized in that: Including heat exchange mode and direct flow mode; The heat exchange mode includes the following steps: S1. After passing through the first horizontal cavity, the first vertical cavity, the second vertical cavity, and the second horizontal cavity in sequence, the flue gas is discharged from the second outlet pipe. S2. Cold air passes through the second heat exchange chamber, the connecting pipe and the first heat exchange chamber in succession, and absorbs the heat of the flue gas in the second vertical chamber along the way to become hot air. The hot air is discharged from the first exhaust pipe and enters the drying oven. The straight-through mode includes the following steps: S3. The two first vertical plates move upward until the two second vertical plates are respectively hidden in the first vertical cavity; S4. After passing through the first horizontal cavity, the second vertical cavity, and the second horizontal cavity, the flue gas is discharged from the second exhaust pipe and enters the drying chamber.

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