A hot air furnace with uniform preheating mechanism

Abstract

The present invention discloses a hot blast furnace with a uniform preheating mechanism, comprising a furnace body and an exhaust pipe, one side of the bottom of the furnace body is connected to the exhaust pipe, and also comprising a heat exchange cylinder, the heat exchange cylinder having a cylindrical structure and an air outlet arranged at the top of the heat exchange cylinder, the end of the exhaust pipe away from the furnace body is connected to the bottom of the heat exchange cylinder, the heat exchange cylinder is used to receive the exhaust gas inside the furnace body; a heat exchanger, the heat exchanger is used to absorb the heat of the exhaust gas inside the heat exchange cylinder, the heat exchanger is arranged inside the heat exchange cylinder, and the top of the heat exchanger is connected to a rotating device; the heat exchanger also includes a heat exchange tube, both ends of the heat exchange tube are connected to a diverter plate, the heat exchange tube is provided with multiple groups and is evenly distributed on the side of the diverter plate, and the present invention relates to the technical field of hot blast furnaces. This hot blast furnace with a uniform preheating mechanism is convenient to avoid the situation where hot gas at a distant position cannot participate in the heat exchange process, thereby conveniently improving the heat exchange efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of hot blast stoves, in particular to a hot blast stove with a uniform preheating mechanism. Background Art

[0002] An effective method for energy saving and consumption reduction in blast furnace ironmaking process is to increase the temperature of the blast furnace entering the furnace. For every 100℃ increase in the blast furnace temperature, the coke ratio per ton of iron can be reduced by 20kg, the output can be increased by 4%, and the amount of coal injection can be increased by 50kg. Therefore, all enterprises attach great importance to keeping the blast temperature at a relatively high level for smelting operations. In the prior art, the commonly used method is a hot blast furnace, which is a device that provides hot air to the blast furnace. Its working principle is to burn coal gas through a burner to generate high-temperature flue gas, which exchanges heat with the heat storage body in the hot blast furnace, and the high-temperature flue gas becomes waste gas and is discharged from the flue. Then the cold air passes through the heat storage body, exchanges heat with the heat storage body and becomes hot air and high-temperature air. Among them, the hot blast furnace exhaust gas contains a large amount of heat. In order to save energy and to increase the temperature of the hot blast, various heat exchangers are generally used to recover the waste heat of the hot blast furnace exhaust gas and preheat the coal gas and / or combustion air.

[0003] However, the preheating devices currently used are usually not convenient for sufficient heat exchange between cold air and hot air. The distance between some cold air and hot air is relatively far, resulting in uneven preheating of the cold air. In addition, the hot air at the edge cannot come into close contact with the cold air, resulting in the inability to participate in the heat exchange process, resulting in low heat exchange efficiency. Summary of the invention

[0004] To achieve the above objectives, the present invention is implemented through the following technical solutions: A hot air furnace with a uniform preheating mechanism, comprising a furnace body and an exhaust pipe, wherein one side of the bottom of the furnace body is connected to the exhaust pipe, and further comprising

[0005] A heat exchange tube, the heat exchange tube having a cylindrical structure and an air outlet arranged at the top of the heat exchange tube, the end of the exhaust pipe away from the furnace body is connected to the bottom of the heat exchange tube, and the heat exchange tube is used to receive the exhaust gas inside the furnace body;

[0006] A heat exchanger, which is used to absorb the heat of the exhaust gas inside the heat exchange cylinder. The heat exchanger is arranged inside the heat exchange cylinder, and the top of the heat exchanger is connected to a rotating device;

[0007] The heat exchanger also includes a heat exchange tube, both ends of which are connected to a diverter plate, the heat exchange tube is provided with multiple groups and evenly distributed on the side of the diverter plate, and a heat conducting strip is passed through and fixedly connected to the side of the heat exchange tube;

[0008] The heat exchanger further comprises an arc-shaped plate, wherein the arc-shaped plates are provided in multiple groups and correspond to the heat exchange tubes one by one, and the side of the arc-shaped plate is fixedly connected with an arc-shaped reinforcement strip;

[0009] The heat exchanger also includes an air duct, which is arranged on the side of the diverter plate. The air duct is connected to the inside of the diverter plate, which is convenient for avoiding the situation where hot air at a distant location cannot participate in the heat exchange process, thereby improving the heat exchange efficiency and improving the utilization rate of the hot air inside the heat exchange tube. The utilization rate of the heat in the exhaust gas is further improved, so that the cold air inside the heat exchanger can reach a higher temperature.

[0010] Preferably, the air ducts are provided in two groups and are symmetrically distributed on the diverter plates at both ends of the heat exchange tubes, the air ducts above the heat exchange tubes are connected to the rotating device, and the air ducts below the heat exchange tubes pass through the heat exchange tubes and extend to the outside of the heat exchange tubes.

[0011] Preferably, the arc-shaped plate comprises a plate body, the plate body is arranged in an arc shape, an inner wall of the plate body is fixedly connected with an air guide plate, and the air guide plates are arranged in multiple groups and are evenly distributed on the inner side of the plate body.

[0012] Preferably, the center position of the inner wall of the plate body is fixedly connected to the heat exchange tube, and the side of the air guide plate away from the plate body faces the position between the axis of the heat exchange tube and the inner wall of the plate body.

[0013] Preferably, the rotating device includes an adjusting seat, a cavity is opened at the center of the adjusting seat, a rotating motor is fixedly connected to the top of the adjusting seat through a bracket, a driving shaft of the rotating motor passes through the adjusting seat and extends into the cavity, one side of the cavity is connected to an air outlet pipe, and the part of the adjusting seat located on the side of the rotating motor passes through and is fixedly connected with the adjusting device, which can drive the heat exchanger to rotate while connecting the heat exchanger with external equipment through the cavity and the air outlet pipe, and has a better use effect.

[0014] Preferably, the adjustment seat is arranged inside the air outlet and fixedly connected to the inner wall of the air outlet, and the top of the air guide pipe above the heat exchange pipe passes through the adjustment seat and is connected to the inside of the cavity.

[0015] Preferably, the air duct above the heat exchange tube is rotatably connected to the adjustment seat via a rotating bearing, the driving shaft of the rotating motor extends into the air duct inside the cavity, and the driving shaft of the rotating motor is fixedly connected to the inner wall of the air duct inside the cavity via a fixed bracket.

[0016] Preferably, the adjusting device comprises an upper hemispherical shell and a lower hemispherical shell, the sides of the upper hemispherical shell and the lower hemispherical shell are both sleeved and fixedly connected with fixing rings, the fixing rings are provided with fixing holes, the inner walls of the fixing holes are slidably connected with a bolt and nut combination, the top of the upper hemispherical shell is connected with a threaded tube, the bottom of the lower hemispherical shell is connected with an exhaust pipe, a spherical plug is arranged between the upper hemispherical shell and the lower hemispherical shell, the top of the spherical plug is fixedly connected with a threaded push rod, and the upper hemispherical shell is provided with exhaust holes, and the pressure inside the heat exchange tube and the flow rate of the hot air inside the heat exchange tube within a certain period of time can be changed by controlling the ventilation efficiency of the adjusting device, so that adaptive adjustment can be carried out according to the flow rate of cold air inside the heat exchanger, so that the device can maintain a high heat exchange efficiency.

[0017] Preferably, one end of the exhaust pipe away from the lower hemispherical shell passes through the adjustment seat and is connected to the interior of the heat exchange cylinder, and the exhaust holes are provided in multiple groups and are evenly distributed on the upper hemispherical shell.

[0018] Preferably, the diameters of the upper hemispherical shell and the lower hemispherical shell are the same, the diameter of the spherical plug is smaller than the diameters of the upper hemispherical shell and the lower hemispherical shell, and the top of the threaded push rod extends into the interior of the threaded barrel and is threadedly connected to the inner wall of the threaded barrel.

[0019] The present invention provides a hot air stove with a uniform preheating mechanism. It has the following beneficial effects:

[0020] 1. This kind of hot air furnace with a uniform preheating mechanism, when in use, the exhaust gas generated inside the furnace body enters the heat exchange tube through the exhaust pipe, and then exchanges heat with the heat exchanger inside the heat exchange tube, and is discharged from the top of the heat exchange tube. While exchanging heat, the heat exchanger can be driven to rotate by a rotating device, so that the heat exchanger can drive the cold air inside it to exchange heat with the hot air at different positions inside the heat exchange tube, which is convenient to avoid the situation where the hot air at a farther position cannot participate in the heat exchange process, thereby improving the heat exchange efficiency.

[0021] 2. A hot air furnace with a uniform preheating mechanism, wherein a heat conduction strip and an arc plate are arranged inside the heat exchanger. When the rotating device drives the heat exchanger to rotate, the heat exchange tube inside the heat exchanger drives the arc plate to rotate. While the arc plate rotates, the hot air on both sides of the heat exchange tube can be pushed toward the center position of the arc plate, that is, toward the direction of the heat exchange tube, so that the hot air at the edge can also contact the heat exchange tube, and exchange heat with the cold air inside the heat exchange tube through the heat conduction strip, thereby improving the utilization rate of the hot air inside the heat exchange tube, further improving the utilization rate of the heat in the exhaust gas, and allowing the cold air inside the heat exchanger to reach a higher temperature.

[0022] 3. This hot air furnace with a uniform preheating mechanism is provided with a rotating device. When in use, the rotating motor inside the rotating device can drive the air duct to rotate, and the air duct can drive the diverter plate and the heat exchange tube to rotate, thereby driving the entire heat exchanger to rotate. At the same time, the cold air inside the heat exchanger can be discharged through the cavity and the air outlet pipe after the heat exchange is completed. While driving the heat exchanger to rotate, the heat exchanger can also be connected with external equipment through the cavity and the air outlet pipe, and the use effect is better.

[0023] 4. This hot air furnace with a uniform preheating mechanism is provided with an adjusting device. When in use, the threaded push rod is rotated. The threaded push rod can drive the spherical plug to move between the upper hemispherical shell and the lower hemispherical shell while the threaded tube rotates. When the spherical plug is closer to the middle position, the ventilation efficiency of the adjusting device is higher, and vice versa, the ventilation efficiency of the adjusting device is lower. The pressure inside the heat exchange tube and the flow rate of the hot air inside the heat exchange tube within a certain period of time can be changed by controlling the ventilation efficiency of the adjusting device, so that adaptive adjustment can be made according to the speed of the cold air flowing inside the heat exchanger, so that the device can maintain a high heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of a hot air furnace with a uniform preheating mechanism of the present invention;

[0025] Figure 2 This is a schematic diagram of the heat exchange tube structure of the present invention;

[0026] Figure 3 This is a schematic diagram of the internal structure of the heat exchange tube of the present invention;

[0027] Figure 4 It is a schematic diagram of the structure of the heat exchanger of the present invention;

[0028] Figure 5 This is a schematic diagram of the structure of the curved plate of the present invention;

[0029] Figure 6 It is a schematic diagram of the structure of the rotating device of the present invention;

[0030] Figure 7 This is a schematic diagram of the internal structure of the adjustment seat of the present invention;

[0031] Figure 8 It is a schematic diagram of the internal structure of the regulating device of the present invention.

[0032] In the figure: 1. furnace body; 2. exhaust pipe; 3. heat exchange tube; 4. air outlet; 5. heat exchanger; 51. heat exchange tube; 52. diverter plate; 53. heat conduction strip; 54. arc plate; 541. plate body; 542. air guide plate; 55. arc reinforcement strip; 56. air guide pipe; 6. rotating device; 61. adjustment seat; 62. cavity; 63. rotating motor; 64. air outlet pipe; 65. adjusting device; 651. upper hemispherical shell; 652. lower hemispherical shell; 653. fixing ring; 654. fixing hole; 655. bolt and nut combination; 656. threaded tube; 657. exhaust pipe; 658. spherical plug; 659. threaded push rod; 650. exhaust hole. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figure 1-Figure 5 The present invention provides a technical solution: a hot air furnace with a uniform preheating mechanism, comprising a furnace body 1 and an exhaust pipe 2, wherein one side of the bottom of the furnace body 1 is connected to the exhaust pipe 2, and further comprising

[0035] The heat exchange tube 3 has a cylindrical structure and an air outlet 4 is arranged at the top of the heat exchange tube 3. The end of the exhaust pipe 2 away from the furnace body 1 is connected to the bottom of the heat exchange tube 3. The heat exchange tube 3 is used to receive the exhaust gas inside the furnace body 1.

[0036] The heat exchanger 5 is used to absorb the heat of the exhaust gas inside the heat exchange tube 3. The heat exchanger 5 is arranged inside the heat exchange tube 3, and the top of the heat exchanger 5 is connected to a rotating device 6;

[0037] The heat exchanger 5 also includes a heat exchange tube 51, both ends of the heat exchange tube 51 are connected to a diverter plate 52, multiple groups of heat exchange tubes 51 are arranged and evenly distributed on the side of the diverter plate 52, and a heat conducting strip 53 is passed through and fixedly connected to the side of the heat exchange tube 51;

[0038] The heat exchanger 5 further includes arc plates 54, which are provided in multiple groups and correspond to the heat exchange tubes 51 one by one, and arc reinforcing strips 55 are fixedly connected to the sides of the arc plates 54;

[0039] The heat exchanger 5 further includes an air duct 56 , which is disposed on a side of the diverter plate 52 and communicates with the interior of the diverter plate 52 .

[0040] Two groups of air ducts 56 are provided and symmetrically distributed on the diverter plates 52 at both ends of the heat exchange tube 51 . The air ducts 56 above the heat exchange tube 51 are connected to the rotating device 6 , and the air ducts 56 below the heat exchange tube 51 penetrate the heat exchange tube 3 and extend to the outside of the heat exchange tube 3 .

[0041] When in use, the exhaust gas generated inside the furnace body 1 enters the heat exchange tube 3 through the exhaust pipe 2, and then exchanges heat with the heat exchanger 5 inside the heat exchange tube 3, and is discharged from the top of the heat exchange tube 3. While exchanging heat, the heat exchanger 5 can be driven to rotate by the rotating device 6, so that the heat exchanger 5 can drive the cold air inside it to exchange heat with the hot air at different positions inside the heat exchange tube 3, which is convenient to avoid the situation where the hot air at a distant position cannot participate in the heat exchange process, thereby facilitating the improvement of the heat exchange efficiency. At the same time, the heat exchanger 5 is provided with a heat conducting strip 53 and an arc plate 54. When the rotating device 6 drives When the dynamic heat exchanger 5 rotates, the heat exchange tube 51 inside the heat exchanger 5 drives the arc plate 54 to rotate. When the arc plate 54 rotates, the hot air on both sides of the heat exchange tube 51 can be pushed toward the center of the arc plate 54, that is, toward the direction of the heat exchange tube 51, so that the hot air at the edge can also contact the heat exchange tube 51, and exchange heat with the cold air inside the heat exchange tube 51 through the heat conductive strip 53, thereby improving the utilization rate of the hot air inside the heat exchange tube 3, further improving the utilization rate of the heat in the exhaust gas, so that the cold air inside the heat exchanger 5 can reach a higher temperature;

[0042] The arc plate 54 includes a plate body 541, which is arranged in an arc shape. An air guide plate 542 is fixedly connected to the inner wall of the plate body 541. There are multiple groups of air guide plates 542 and they are evenly distributed on the inner side of the plate body 541. The center position of the inner wall of the plate body 541 is fixedly connected to the heat exchange tube 51. The air guide plate 542 is away from the side of the plate body 541 toward the position between the axis of the heat exchange tube 51 and the inner wall of the plate body 541. When the arc plate 54 pushes the hot air on both sides to move toward its center position, the hot air can be guided to the position of the heat exchange tube 51 through the air guide plate 542, so that the hot air can smoothly contact the heat exchange tube 51 and exchange heat.

[0043] See also Figure 1-Figure 6The present invention provides a technical solution: the rotating device 6 includes an adjusting seat 61, a cavity 62 is opened at the center of the adjusting seat 61, a rotating motor 63 is fixedly connected to the top of the adjusting seat 61 through a bracket, a driving shaft of the rotating motor 63 passes through the adjusting seat 61 and extends to the inside of the cavity 62, an air outlet pipe 64 is connected to one side of the cavity 62, and an adjusting device 65 is passed through and fixedly connected to the part of the adjusting seat 61 located on the side of the rotating motor 63, the adjusting seat 61 is arranged inside the air outlet 4 and fixedly connected to the inner wall of the air outlet 4, the top of the air duct 56 above the heat exchange tube 51 passes through the adjusting seat 61 and is connected to the inside of the cavity 62, and the air duct 56 above the heat exchange tube 51 is connected to the adjusting seat 6 through a rotating bearing 1 is rotatably connected, the driving shaft of the rotating motor 63 extends into the air duct 56 inside the cavity 62, and the driving shaft of the rotating motor 63 is fixedly connected to the inner wall of the air duct 56 inside the cavity 62 through a fixed bracket, and a rotating device 6 is provided. When in use, the rotating motor 63 inside the rotating device 6 can drive the air duct 56 to rotate, and the air duct 56 drives the diverter plate 52 and the heat exchange tube 51 to rotate, thereby driving the entire heat exchanger 5 to rotate. At the same time, the cold air inside the heat exchanger can also be discharged through the cavity 62 and the air outlet pipe 64 after the heat exchange is completed. The heat exchanger 5 can be driven to rotate and can also be connected to external equipment through the cavity 62 and the air outlet pipe 64, and the use effect is better.

[0044] See also Figure 1-Figure 8The present invention provides a technical solution: the adjustment device 65 includes an upper hemispherical shell 651 and a lower hemispherical shell 652, the upper hemispherical shell 651 and the lower hemispherical shell 652 are both sleeved and fixedly connected with a fixing ring 653 on the side, a fixing hole 654 is opened on the fixing ring 653, a bolt and nut combination 655 is slidably connected to the inner wall of the fixing hole 654, a threaded cylinder 656 is connected to the top of the upper hemispherical shell 651, and an exhaust pipe 657 is connected to the bottom of the lower hemispherical shell 652, a spherical plug 658 is arranged between the upper hemispherical shell 651 and the lower hemispherical shell 652, and a threaded push rod 659 is fixedly connected to the top of the spherical plug 658, an exhaust hole 650 is opened on the upper hemispherical shell 651, and one end of the exhaust pipe 657 away from the lower hemispherical shell 652 passes through the adjustment seat 61 and is connected to the inside of the heat exchange tube 3, multiple groups of exhaust holes 650 are arranged and are evenly distributed on the upper hemispherical shell 651, and the upper hemispherical shell 651 The diameter of the spherical plug 658 is the same as the diameter of the lower hemispherical shell 652, and is smaller than the diameters of the upper hemispherical shell 651 and the lower hemispherical shell 652. The top of the threaded push rod 659 extends to the inside of the threaded tube 656 and is threadedly connected to the inner wall of the threaded tube 656. An adjusting device 65 is provided. When in use, the threaded push rod 659 is rotated. The threaded push rod 659 can drive the spherical plug 658 to move between the upper hemispherical shell 651 and the lower hemispherical shell 652 while the threaded tube 656 rotates. When the spherical plug 658 is closer to the middle position, the higher the ventilation efficiency of the adjusting device 65, and vice versa, the lower the ventilation efficiency of the adjusting device 65. The pressure inside the heat exchange tube 3 and the flow rate of the hot air inside the heat exchange tube 3 within a certain period of time can be changed by controlling the ventilation efficiency of the adjusting device 65, so as to facilitate adaptive adjustment according to the speed of the cold air flowing inside the heat exchanger 5, so as to facilitate the device to maintain a high heat exchange efficiency.

[0045] Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field and related fields without creative work should fall within the scope of protection of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention are implemented according to the conventional means in the field unless otherwise specified and limited.

Claims

1. A hot air furnace with a uniform preheating mechanism, comprising a furnace body (1) and an exhaust pipe (2), wherein one side of the bottom of the furnace body (1) is connected to the exhaust pipe (2), and is characterized in that: Also includes A heat exchange tube (3), the heat exchange tube (3) having a cylindrical structure, and an air outlet (4) arranged at the top of the heat exchange tube (3), the end of the exhaust pipe (2) away from the furnace body (1) being connected to the bottom of the heat exchange tube (3), and the heat exchange tube (3) being used to receive exhaust gas inside the furnace body (1); A heat exchanger (5), the heat exchanger (5) being used to absorb the heat of the exhaust gas inside the heat exchange cylinder (3), the heat exchanger (5) being arranged inside the heat exchange cylinder (3), and the top of the heat exchanger (5) being connected to a rotating device (6); The heat exchanger (5) further comprises a heat exchange tube (51), both ends of the heat exchange tube (51) are connected to a diverter plate (52), a plurality of groups of the heat exchange tubes (51) are arranged and are evenly distributed on the side of the diverter plate (52), and a heat conducting strip (53) is passed through and fixedly connected to the side of the heat exchange tube (51); The heat exchanger (5) further comprises arc-shaped plates (54), wherein the arc-shaped plates (54) are provided in multiple groups and correspond one to one with the heat exchange tubes (51), and arc-shaped reinforcing strips (55) are fixedly connected to the sides of the arc-shaped plates (54); The heat exchanger (5) further comprises an air guide pipe (56), wherein the air guide pipe (56) is arranged on the side of the diverter plate (52), and the air guide pipe (56) is connected to the inside of the diverter plate (52); The rotating device (6) comprises an adjusting seat (61), a cavity (62) is provided at the center of the adjusting seat (61), a rotating motor (63) is fixedly connected to the top of the adjusting seat (61) via a bracket, a driving shaft of the rotating motor (63) passes through the adjusting seat (61) and extends into the cavity (62), an air outlet pipe (64) is connected to one side of the cavity (62), and an adjusting device (65) is passed through and fixedly connected to a portion of the adjusting seat (61) located on one side of the rotating motor (63); The adjustment seat (61) is arranged inside the air outlet (4) and is fixedly connected to the inner wall of the air outlet (4); the top of the air guide pipe (56) above the heat exchange pipe (51) passes through the adjustment seat (61) and is in communication with the inside of the cavity (62); The air guide pipe (56) above the heat exchange pipe (51) is rotatably connected to the adjustment seat (61) via a rotating bearing, the driving shaft of the rotating motor (63) extends into the air guide pipe (56) inside the cavity (62), and the driving shaft of the rotating motor (63) is fixedly connected to the inner wall of the air guide pipe (56) inside the cavity (62) via a fixing bracket; The regulating device (65) comprises an upper hemispherical shell (651) and a lower hemispherical shell (652). The sides of the upper hemispherical shell (651) and the lower hemispherical shell (652) are sleeved with and fixedly connected with fixing rings (653). The fixing ring (653) is provided with a fixing hole (654). The inner wall of the fixing hole (654) is slidably connected with a bolt and nut assembly (655). The top of the upper hemispherical shell (651) is connected with a threaded cylinder (656). The bottom of the lower hemispherical shell (652) is connected with an exhaust pipe (657). A spherical plug (658) is provided between the upper hemispherical shell (651) and the lower hemispherical shell (652). The top of the spherical plug (658) is fixedly connected with a threaded push rod (659). The upper hemispherical shell (651) is provided with an exhaust hole (650).

2. The hot air stove with uniform preheating mechanism according to claim 1, characterized in that: The air guide pipes (56) are provided in two groups and are symmetrically distributed on the diverter plates (52) at both ends of the heat exchange tube (51); the air guide pipes (56) above the heat exchange tube (51) are connected to the rotating device (6); and the air guide pipes (56) below the heat exchange tube (51) penetrate the heat exchange tube (3) and extend to the outside of the heat exchange tube (3).

3. The hot air stove with uniform preheating mechanism according to claim 1, characterized in that: The arc-shaped plate (54) comprises a plate body (541), the plate body (541) is arranged in an arc shape, an inner side wall of the plate body (541) is fixedly connected with an air guide plate (542), and the air guide plates (542) are arranged in multiple groups and are evenly distributed on the inner side of the plate body (541).

4. The hot air stove with uniform preheating mechanism according to claim 3, characterized in that: The center position of the inner wall of the plate body (541) is fixedly connected to the heat exchange tube (51), and the side of the air guide plate (542) away from the plate body (541) is oriented toward the position between the axis of the heat exchange tube (51) and the inner wall of the plate body (541).

5. The hot air stove with uniform preheating mechanism according to claim 1, characterized in that: The end of the exhaust pipe (657) away from the lower hemispherical shell (652) passes through the adjustment seat (61) and is connected to the interior of the heat exchange cylinder (3). The exhaust holes (650) are arranged in multiple groups and are evenly distributed on the upper hemispherical shell (651).

6. The hot air stove with uniform preheating mechanism according to claim 1, characterized in that: The diameters of the upper hemispherical shell (651) and the lower hemispherical shell (652) are the same, the diameter of the spherical plug (658) is smaller than the diameters of the upper hemispherical shell (651) and the lower hemispherical shell (652), and the top of the threaded push rod (659) extends into the interior of the threaded barrel (656) and is threadedly connected to the inner wall of the threaded barrel (656).

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