Dual-mode heat exchanger structure for hot blast stove and working method

Abstract

The invention relates to the technical field of heat exchange equipment, and provides a dual-mode heat exchanger structure for a hot blast stove and a working method.The dual-mode heat exchanger structure comprises a box body and further comprises a heat insulation assembly, a first heat exchange assembly and a second heat exchange assembly, the heat conduction assembly comprises a second horizontal plate and two second vertical plates; a first air outlet pipe, a first air inlet pipe, a second air outlet pipe and two second air inlet pipes. The working method comprises a heat exchange mode and a direct connection mode. The heat exchange mode comprises the following steps that S1, flue gas passes through a first horizontal cavity, a first vertical cavity, a second vertical cavity and a second horizontal cavity in sequence and then is exhausted from a second gas outlet pipe; s2, cold air absorbs smoke heat in a second vertical cavity to become hot air, and the hot air is discharged from a second air outlet pipe and enters the drying box; the direct connection mode comprises the following steps that S3, the two first vertical plates move upwards; and S4, the flue gas is discharged from a second gas outlet pipe and enters the drying box. The material drying device can improve the material drying efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchange equipment, and in particular to a dual-mode heat exchanger structure and a working method for a hot blast stove. Background Art

[0002] Hot blast furnace is a thermal power machine. It began to be widely used in my country in the late 1970s. It has become a replacement product for electric heat source and traditional steam power heat source in many industries. There are many varieties and series of hot blast furnaces. They are divided into manual burning and machine burning according to the coal adding method, and divided into coal, oil, gas furnaces, etc. 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 the cold air absorbs heat, it enters the drying box to dry the materials inside.

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

[0005] In view of the defects in the prior art, the object of the present invention is to provide a dual-mode heat exchanger structure and working method for a hot blast stove, which can improve the drying efficiency of materials.

[0006] In order to achieve the above-mentioned object, according to a first aspect of the present invention, a dual-mode heat exchanger structure for a hot air stove is disclosed, which is used in conjunction with a drying box, and includes a box body and further includes:

[0007] A heat insulation assembly, the heat insulation assembly comprising a first horizontal plate and two first vertical plates, the first horizontal plate being arranged below the box body and having a first horizontal cavity therein, the two first vertical plates being respectively inserted into the interior of both sides of the box body, the two first vertical plates being fixedly connected to the first horizontal plate, a first vertical cavity being formed inside the first vertical plate, and the first vertical cavity being in communication with the first horizontal cavity;

[0008] A heat conduction component, wherein the heat conduction component comprises a second horizontal plate and two second vertical plates, the second horizontal plate is arranged above the box body and has a second horizontal cavity inside, the two second vertical plates are respectively inserted into the interior of the two sides of the box body, and divide the interior of the box body 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, the two second vertical plates are fixedly connected to the second horizontal plate, a connecting pipe is fixedly installed at the lower part of the second vertical plate, the connecting pipe connects the second heat exchange cavities on both sides with the first heat exchange cavity, the part of the second vertical plate located in the box body is made of heat conductive material, a second vertical cavity is formed inside the second vertical plate, the second vertical cavity is connected with the second horizontal cavity, and the second vertical plate is in sliding contact with the inner wall of the first vertical cavity on the same side;

[0009] A first air outlet pipe, a first air inlet pipe, a second air outlet pipe and two second air inlet pipes, the first air outlet pipe is connected to the first heat exchange cavity, the first air inlet pipe is connected to the first horizontal cavity, the second air outlet pipe is connected to the second horizontal cavity, and the two second air inlet pipes are respectively connected to the two second heat exchange cavities.

[0010] Furthermore, a stirring assembly comprises a rotating shaft and a plurality of blades, wherein the rotating shaft is arranged in the first heat exchange cavity and both ends are rotatably connected to the inner wall of the box body, and the plurality of blades are fixedly mounted on the rotating shaft.

[0011] Furthermore, the two connecting pipes on the second vertical plates are respectively located on the front and rear sides of the rotating shaft.

[0012] 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 box body, the second end of the rotating rod is a free end, and the rotating rod is provided with a guide groove extending along its length direction. The guide shaft is connected to the first vertical plate and is also in sliding 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.

[0013] Furthermore, the guide shaft is rotatably connected to the first vertical plate.

[0014] Furthermore, a first sealing gasket is fixedly mounted on the box body, and the first sealing gasket is used to achieve sealing between the first vertical plate and the box body. A second sealing gasket is fixedly mounted on the first vertical plate, and the second sealing gasket is used to achieve sealing between the first vertical cavity and the second vertical plate.

[0015] According to a second aspect of the present invention, a working method is disclosed, which is applied to the dual-mode heat exchanger structure for the hot blast stove as claimed in claim 5, including a heat exchange mode and a straight-through mode;

[0016] The heat exchange mode comprises the following steps:

[0017] S1, the smoke passes through the first horizontal cavity, the first vertical cavity, the second vertical cavity and the second horizontal cavity in sequence, and is discharged from the second gas outlet pipe;

[0018] S2, the cold air passes through the second heat exchange chamber, the connecting pipe and the first heat exchange chamber in sequence, and absorbs the heat of the smoke in the second vertical chamber on the way to become hot air, and the hot air is discharged from the second air outlet pipe and enters the drying box;

[0019] The direct mode includes the following steps:

[0020] S3, the two first vertical plates move upward until the two second vertical plates are respectively hidden in the first vertical cavity;

[0021] S4. After the smoke passes through the first horizontal cavity, the second vertical cavity and the second horizontal cavity in sequence, it is discharged from the second air outlet pipe and enters the drying box.

[0022] Beneficial effects of the present invention: The present invention provides a dual-mode heat exchanger structure and working method for a hot blast furnace. By controlling the lifting and lowering of the two first vertical plates, the structure can be switched between the heat exchange mode and the direct-through mode. The basis for switching is whether the material in the drying box reacts with the flue gas. When the structure is in the heat exchange mode, the flue gas discharged from the hot blast 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 box; when the structure is in the direct-through mode, the flue gas discharged from the hot blast furnace will directly pass through the structure to dry the material in the drying box. The switching speed is fast, which improves the drying efficiency of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention at a first viewing angle;

[0024] Figure 2 A schematic diagram of the three-dimensional structure of the present invention at a second viewing angle

[0025] Figure 3 It is a front view structural schematic diagram of the present invention;

[0026] Figure 4 It is a schematic diagram of the internal cross-sectional structure of the present invention;

[0027] Figure 5 for Figure 4Schematic diagram of the enlarged structure of part A

[0028] Reference numerals: 10 - box body, 11 - first heat exchange chamber, 12 - second heat exchange chamber, 20 - heat insulation assembly, 21 - first horizontal plate, 22 - first vertical plate, 23 - first horizontal cavity, 24 - first vertical cavity, 30 - heat conduction assembly, 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 pipe, 50 - lifting mechanism, 51 - rotating rod, 52 - guiding shaft, 53 - motor, 54 - guiding groove, 55 - first gasket, 56 - second gasket Detailed implementation manners

[0029] In order to make the technical means, creative features, achieved purposes and functions of the present invention easy to understand, the present invention will be further described below in conjunction with the detailed implementation manners

[0030] In this application, unless otherwise clearly specified and limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations

[0031] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "horizontal", "top", "bottom", "upper", "lower", "inner" and "outer" etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention

[0032] In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. In the description of the present invention, "a plurality of" means two or more unless otherwise clearly and specifically defined

[0033] Such as Figure 1-Figure 5As shown in the figure, the present invention provides a dual-mode heat exchanger structure for a hot blast stove, which is used in cooperation with a hot blast stove 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.

[0034] The heat insulation component 20 includes a first horizontal plate 21 and two first vertical plates 22. The first horizontal plate 21 is arranged below the box body 10 and has a first horizontal cavity 23 inside. The two first vertical plates 22 are respectively inserted into the interiors of both sides of the box body 10. The two first vertical plates 22 are both fixedly connected to the first horizontal plate 21, and a U-shaped structure is formed 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.

[0035] The heat conduction component 30 includes a second horizontal plate 31 and two second vertical plates 32. The second horizontal plate 31 is arranged above the box body 10 and has a second horizontal cavity 33 inside. The two second vertical plates 32 are respectively inserted into the interiors of both sides of the box body 10 and divide the interior of the box body 10 into a first heat exchange cavity 11 and two second heat exchange cavities 12. The two second heat exchange cavities 12 are respectively located on both sides of the first heat exchange cavity 11. The two second vertical plates 32 are both fixedly connected to the second horizontal plate 31, and a U-shaped structure is formed between each of the two second vertical plates 32 and the second horizontal plate 31. A communicating pipe 35 is fixedly installed at the lower part of the second vertical plate 32, and the communicating pipe 35 communicates the two second heat exchange cavities 12 on both sides with the first heat exchange cavity 11. The part of the second vertical plate 32 located inside the box body 10 is made of a heat-conducting material. A second vertical cavity 34 is formed inside the second vertical plate 32, and the second vertical cavity 34 communicates with the second horizontal cavity 33. The second vertical plate 32 is in sliding contact with the inner wall of the first vertical cavity 24 on the same side.

[0036] The first air outlet pipe 41, the first air inlet pipe 42, the second air outlet pipe 43 and the two second air inlet pipes 44. The first air outlet pipe 41 communicates with the first heat exchange cavity 11 through a U-shaped pipe 49, and a first valve 45 is provided on the first air outlet pipe 41. The first air inlet pipe 42 communicates with the first horizontal cavity 23, and a second valve 46 is provided on the second air outlet pipe 43. The second air outlet pipe 43 communicates with the second horizontal cavity 33, and a third valve 47 is provided on the second air outlet pipe 43. The two second air inlet pipes 44 respectively communicate with the two second heat exchange cavities 12, and a fourth valve 48 is provided on the second air inlet pipe 44.

[0037] Preferably, the box body 10, the first horizontal plate 21, the first vertical plates 22, the second horizontal plate 31 and the parts of the second vertical plates 32 located outside the box body 10 are made of heat-insulating materials.

[0038] This structure has two working modes, namely heat exchange mode and direct mode. Among them, the heat exchange mode is suitable for the scene where the exhaust gas from the hot air furnace will react with the material in the drying box. The direct mode is suitable for the scene where the exhaust gas from the hot air furnace will not react with the material in the drying box.

[0039] In the 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 smoke exhausted from the hot blast furnace passes through the first air inlet pipe 42, the first horizontal cavity 23, the first vertical cavity 24, the second vertical cavity 34 and the second horizontal cavity 33, and is discharged from the second air outlet pipe 43. Then, the cold air blown by the fan passes through the second air inlet pipe 44, the second heat exchange cavity 12, the connecting pipe 35 and the first heat exchange cavity 11, and absorbs the heat of the smoke in the second vertical cavity 34 on the way to contact with the part of the second vertical plate 32 located in the box body 10 to become hot air, and the hot air is discharged from the second air outlet pipe 43 and enters the drying box to dry the material.

[0040] Since the smoke from the hot air furnace will react with the materials in the drying box, this mode uses the cold air blown out by the fan to exchange heat with the smoke from the hot air furnace, absorbing the heat of the smoke to become hot air and then drying the materials.

[0041] In the straight-through mode, the first valve 45 and the fourth valve 48 are in a closed state, and the second valve 46 and the third valve 47 are in an open state. The specific working process is as follows: the smoke exhausted from the hot air furnace passes through the first air inlet pipe 42, the first horizontal cavity 23, the first vertical cavity 24, the second vertical cavity 34 and the second horizontal cavity 33, and then is discharged from the second air outlet pipe 43 and directly enters the drying box to dry the material, eliminating the heat exchange link and drying the material with the fastest efficiency.

[0042] Since the exhaust gas from the hot air furnace will not react with the materials in the drying box, this mode directly sends the exhaust gas from the hot air furnace into the drying box to dry the materials.

[0043] It is worth noting that the present invention can dry the material with the highest efficiency by switching between the heat exchange mode and the straight-through mode according to whether the material in the drying box reacts with the flue gas. And it does not need to be disassembled from beginning to end, which saves a lot of time, reduces the labor intensity of the staff, and improves the overall drying efficiency.

[0044] The design of the second vertical plate 32 enables the cold air to contact the second vertical plate 32 twice in the second heat exchange chamber 12 and the first heat exchange chamber 11, thereby prolonging the heat exchange time, increasing the heat exchange contact area, and achieving a better heat exchange effect. The design of the connecting pipe 35 enables 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.

[0045] In one embodiment, the stirring assembly includes a rotating shaft and a plurality of blades. The rotating shaft is longitudinally arranged in the first heat exchange chamber 11, and both ends are rotatably connected to the inner wall of the box body 10. The plurality of blades are fixedly mounted on the rotating shaft.

[0046] 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 the blades to rotate. On the one hand, the cold air is blown onto the outer wall of the second vertical plate 32 to improve the heat exchange effect; on the other hand, it can stir the airflow in the first heat exchange chamber 11 to make the heat distribution even, further improving the heat exchange effect.

[0047] In one embodiment, the connecting pipes 35 on the two second vertical plates 32 are respectively located on the front and rear sides of the rotating shaft. In this way, the cold air blown out from the connecting pipes 35 will respectively 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.

[0048] In one embodiment, a lifting mechanism 50 is further included, and the lifting mechanism 50 includes 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 box body 10, and the second end of the rotating rod 51 is a free end. The rotating rod 51 is provided with a guide groove 54 extending along its length. The guide shaft 52 is connected to the first vertical plate 22 and is also in sliding contact with the inner wall of the guide groove 54. The motor 53 is fixedly installed on the outer wall of the box body 10 and is used to control the first end of the rotating rod 51 to rotate.

[0049] When the present invention needs to switch from the heat exchange mode to the straight-through mode, the motor 53 controls the first end of the rotating rod 51 to rotate, and at this time the second end of the rotating rod 51 swings upward, and under the action of the guide groove 54 and the guide shaft 52, the first vertical plate 22 moves 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-insulating material, when the smoke passes through the second vertical cavity 34, the heat will not be lost to the outside too much.

[0050] On the contrary, the present invention can switch from the heat exchange mode to the direct-through mode.

[0051] 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 .

[0052] In one embodiment, a first sealing gasket 55 is fixedly mounted on the box body 10, and the first sealing gasket 55 is used to achieve sealing between the first vertical plate 22 and the box body 10. A second sealing gasket 56 is fixedly mounted on the first vertical plate 22, and the second sealing gasket 56 is used to achieve sealing between the first vertical cavity 24 and the second vertical plate 32.

[0053] According to a second aspect of the present invention, a working method is disclosed, including a heat exchange mode and a direct-pass mode.

[0054] The heat exchange mode includes the following steps:

[0055] 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 smoke exhausted from the hot blast stove passes through the first air 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 air outlet pipe 43.

[0056] 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 turn, and absorbs the heat of the flue gas in the second vertical chamber 34 to become hot air on the way of contacting the part of the second vertical plate 32 located in the box body 10. The hot air is discharged from the second air outlet pipe 43 and enters the drying box to dry the material.

[0057] The pass-through mode includes the following steps:

[0058] S3, the first valve 45 and the fourth valve 48 are in a closed state, and the second valve 46 and the third valve 47 are in an open state. The motor 53 controls the first end of the rotating rod 51 to rotate, and at this time the second end of the rotating rod 51 swings upward, and under the action of the guide groove 54 and the guide shaft 52, the first vertical plate 22 moves upward until the two second vertical plates 32 are respectively hidden in the first vertical cavity 24.

[0059] S4, the smoke from the hot air furnace passes through the first air inlet pipe 42, the first horizontal cavity 23, the first vertical cavity 24, the second vertical cavity 34 and the second horizontal cavity 33, and then is discharged from the second air outlet pipe 43 and directly enters the drying box to dry the material. Since the first vertical plate 22 is made of heat insulating material, when the smoke passes through the second vertical cavity 34, the heat will not be lost to the outside too much.

[0060] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0061] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A dual-mode heat exchanger structure for a hot air stove, used in conjunction with a drying box, comprising a box body, characterized in that: Also includes: A heat insulation assembly, the heat insulation assembly comprising a first horizontal plate and two first vertical plates, the first horizontal plate being arranged below the box body and having a first horizontal cavity therein, the two first vertical plates being respectively inserted into the interior of both sides of the box body, the two first vertical plates being fixedly connected to the first horizontal plate, a first vertical cavity being formed inside the first vertical plate, and the first vertical cavity being in communication with the first horizontal cavity; A heat conduction component, wherein the heat conduction component comprises a second horizontal plate and two second vertical plates, the second horizontal plate is arranged above the box body and has a second horizontal cavity inside, the two second vertical plates are respectively inserted into the interior of the two sides of the box body, and divide the interior of the box body 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, the two second vertical plates are fixedly connected to the second horizontal plate, a connecting pipe is fixedly installed at the lower part of the second vertical plate, the connecting pipe connects the second heat exchange cavities on both sides with the first heat exchange cavity, the part of the second vertical plate located in the box body is made of heat conductive material, a second vertical cavity is formed inside the second vertical plate, the second vertical cavity is connected with the second horizontal cavity, and the second vertical plate is in sliding contact with the inner wall of the first vertical cavity on the same side; A first air outlet pipe, a first air inlet pipe, a second air outlet pipe and two second air inlet pipes, the first air outlet pipe is connected to the first heat exchange cavity, the first air inlet pipe is connected to the first horizontal cavity, the second air outlet pipe is connected to the second horizontal cavity, and the two second air inlet pipes are respectively connected to the two second heat exchange cavities.

2. The dual-mode heat exchanger structure for a hot blast stove according to claim 1, characterized in that: The stirring assembly comprises a rotating shaft and a plurality of blades. The rotating shaft is arranged in the first heat exchange cavity, and both ends are rotatably connected to the inner wall of the box body. The plurality of 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 two connecting pipes on the second vertical plates are respectively located at the front and rear sides of the rotating shaft.

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 box body, the second end of the rotating rod is a free end, and the rotating rod is provided with a guide groove extending along its length direction. The guide shaft is connected to the first vertical plate and is also in sliding 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 mounted on the box body, and the first sealing gasket is used to achieve sealing between the first vertical plate and the box body. A second sealing gasket is fixedly mounted on the first vertical plate, and the second sealing gasket is used to achieve sealing 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 according to claim 5, characterized in that: Includes heat exchange mode and direct-through mode; The heat exchange mode comprises the following steps: S1, the smoke passes through the first horizontal cavity, the first vertical cavity, the second vertical cavity and the second horizontal cavity in sequence, and is discharged from the second gas outlet pipe; S2, the cold air passes through the second heat exchange chamber, the connecting pipe and the first heat exchange chamber in sequence, and absorbs the heat of the smoke in the second vertical chamber on the way to become hot air, and the hot air is discharged from the second air outlet pipe and enters the drying box; The direct 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 the smoke passes through the first horizontal cavity, the second vertical cavity and the second horizontal cavity in sequence, it is discharged from the second air outlet pipe and enters the drying box.

Images