Cut tobacco dryer condensate water preheating cold air system

Abstract

The utility model provides a condensate water preheating cold air system for a cut-tobacco drier, which is applied to a cut-tobacco drier system. The cut-tobacco drier system comprises a cut-tobacco drier, a plate heat exchanger, a plate condensate water pipeline, a condensate water tank, a warm air heat exchanger, a warm air condensate water pipeline and a warm air conveying pipeline, and the plate heat exchanger exchanges heat with the cut-tobacco drier. The plate sheet condensate water pipeline is arranged in the plate sheet heat exchanger, and the outlet end of the plate sheet condensate water pipeline is connected with the condensate water tank. The cut tobacco dryer condensate water preheating cold air system comprises a sheet condensate water preheating assembly and a warm air condensate water preheating assembly, the sheet condensate water preheating assembly heats cold air through heat in sheet condensate water, and the warm air condensate water preheating assembly heats cold air through heat in warm air condensate water. The steam-water separation tank and the warm air condensate water outlet collection tank are arranged, so that the risk of steam blockage caused by steam in the pipe can be eliminated, and the operation reliability of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cigarette rod production equipment, in particular to a condensate preheating cold air system for a cut tobacco dryer. Background Technique

[0002] A cut tobacco dryer is the main equipment for baking cut tobacco. Steam enters a heating box body composed of a plurality of heating plate units. The heating box body rotates along an obliquely downward axis. Cut tobacco tumbles and is heated in the heating box body and gradually discharges from the heating box body under the action of gravity. The steam gradually condenses into water in the heating plate unit, and the condensate is discharged into a condensate tank through a steam trap.

[0003] During the warm-up and operation of the cut tobacco dryer, warm air needs to be continuously blown in to take away the moisture baked out. The warm air is obtained by heat exchange between cold air and steam. After releasing heat, the steam becomes condensate and is discharged into the condensate tank through a steam trap. However, a steam lock is likely to form in front of the steam trap, causing poor drainage, especially obvious under low-pressure working conditions.

[0004] Since the heating of cold air in the prior art is by directly exchanging heat with new steam, the condensate after the steam entering the heating box body condenses still has a relatively high temperature, and the condensate generated after the heat exchange between the steam and the cold air also has a relatively high temperature. Therefore, the heat contained in the above two condensates is not well utilized. Thus, a condensate preheating cold air system for a cut tobacco dryer is designed to utilize the heat in the condensate on the one hand and save the steam consumption required for heating cold air on the other hand. Content of the Utility Model

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the utility model is to provide a condensate preheating cold air system for a cut tobacco dryer, which is used to solve the problem that in the prior art, although the condensate still has a relatively high temperature, the heat contained in the condensate is not well utilized and there is a large waste.

[0006] To achieve the above and other related objectives, the present utility model provides a condensate preheating cold air system for a cut tobacco dryer, which is applied to a cut tobacco dryer system; the cut tobacco dryer system includes a cut tobacco dryer, a plate heat exchanger, a plate condensate pipeline, a condensate tank, a warm air heat exchanger, a warm air condensate pipeline, and a warm air conveying pipeline. The plate heat exchanger exchanges heat with the cut tobacco dryer. The plate condensate pipeline is arranged in the plate heat exchanger, and the outlet end of the plate condensate pipeline is connected to the condensate tank; the warm air condensate pipeline is arranged in the warm air heat exchanger, and the outlet end of the warm air condensate pipeline is connected to the condensate tank; steam is introduced into the inlet ends of both the plate condensate pipeline and the warm air condensate pipeline; cold air is introduced into the inlet end of the warm air heat exchanger, one end of the warm air conveying pipeline is connected to the outlet end of the warm air heat exchanger, and the other end of the warm air conveying pipeline is connected to the inside of the cut tobacco dryer; the condensate preheating cold air system for the cut tobacco dryer includes a plate condensate preheating component and a warm air condensate preheating component. The plate condensate preheating component uses the heat in the plate condensate to heat the cold air, and the warm air condensate preheating component uses the heat in the warm air condensate to heat the cold air.

[0007] Preferably, a number of first steam traps are also arranged on the plate condensate pipeline; the plate condensate preheating component includes a plate condensate pipeline branch, a steam-water separation tank, a plate condensate heat exchanger, and a plate condensate regulating valve. One end of the plate condensate pipeline branch is connected to the plate condensate pipeline between the plate heat exchanger and the first steam trap, and the other end of the plate condensate pipeline branch is connected to the condensate tank through the plate condensate regulating valve; the steam-water separation tank and the plate condensate heat exchanger are sequentially arranged on the plate condensate pipeline branch; the plate condensate heat exchanger is arranged at the inlet end of the warm air heat exchanger.

[0008] Preferably, a plate condensate level gauge is also arranged on the steam-water separation tank. The plate condensate level gauge is used to measure the liquid level information parameters in the steam-water separation tank and control the opening degree of the plate condensate regulating valve through the liquid level information parameters.

[0009] Preferably, a first valve is also arranged on the plate condensate pipeline in front of the first steam trap. The first valve is used to control the opening and closing of the plate condensate pipeline.

[0010] Preferably, a plurality of second steam traps are further provided on the warm air condensate pipeline; the warm air condensate preheating assembly includes a warm air condensate pipeline branch, a warm air condensate outlet header, a warm air condensate heat exchanger, and a warm air condensate regulating valve. One end of the warm air condensate pipeline branch is connected to the warm air condensate pipeline on the front side of the second steam trap, and the other end of the warm air condensate pipeline branch is connected to the condensate tank through the warm air condensate regulating valve; the warm air condensate outlet header is arranged on the warm air condensate pipeline branch; the warm air condensate heat exchanger is arranged at the inlet end of the warm air heat exchanger.

[0011] Preferably, a warm air condensate level gauge is further provided on the warm air condensate outlet header. The warm air condensate level gauge is used to measure the liquid level information parameters in the warm air condensate outlet header and control the opening degree of the warm air condensate regulating valve through the liquid level information parameters.

[0012] Preferably, a second valve is further provided on the warm air condensate pipeline on the front side of the second steam trap. The second valve is used to control the opening and closing of the warm air condensate pipeline.

[0013] Preferably, a blower is further provided in the warm air conveying pipeline.

[0014] As described above, the condensate preheating cold air system of the cigarette making machine of the present invention has the following beneficial effects:

[0015] 1. For the condensate preheating cold air system of the cigarette making machine involved in the present invention, a steam-water separation tank and a warm air condensate outlet tank are provided, which can eliminate the risk of steam blockage caused by steam in the pipeline and improve the reliability of system operation.

[0016] 2. For the condensate preheating cold air system of the cigarette making machine involved in the present invention, the plate condensate is introduced into the plate condensate heat exchanger, and the plate condensate heat exchanger heats the cold air; the warm air condensate is introduced into the warm air condensate heat exchanger, and the warm air condensate heat exchanger heats the cold air. In this way, the temperature of the warm air is greatly increased, and the steam consumption in the warm air heat exchanger is greatly reduced, so as to achieve the purpose of saving steam.

[0017] 3. Compared with the prior art, the present invention makes full use of the remaining heat in the plate condensate and the warm air condensate, greatly reduces the water temperature in the condensate tank, eliminates the flash steam in the condensate tank, reduces the steam consumption of the warm air heat exchanger, and improves the energy utilization efficiency.

[0018] 4. Compared with the prior art, the present invention makes full use of the waste heat in the drying process, increases the air temperature of the cold air, and greatly reduces the steam consumption of the warm air heat exchanger.

[0019] 5. The utility model combines the control of the existing cigarette drying machine, without any change to the cigarette drying machine, and has a wide range of applications. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the cigarette drying machine system in the prior art of the utility model;

[0021] Figure 2 It is a schematic structural diagram of the condensate preheating cold air system of the cigarette drying machine of the utility model.

[0022] Description of the Reference Numerals:

[0023] 1. Cigarette drying machine; 2. Plate heat exchanger; 3. Plate condensate pipeline; 4. First valve; 5. First steam trap; 6. Condensate tank; 7. Second steam trap; 8. Warm air condensate pipeline; 9. Second valve; 10. Warm air heat exchanger; 11. Warm air conveying pipeline; 12. Blower; 13. Steam-water separator tank; 14. Branch of the plate condensate pipeline; 15. Plate condensate heat exchanger; 16. Plate condensate regulating valve; 17. Plate condensate level gauge; 18. Branch of the warm air condensate pipeline; 19. Warm air condensate outlet header; 20. Warm air condensate level gauge; 21. Warm air condensate heat exchanger; 22. Warm air condensate regulating valve. Detailed Embodiment

[0024] The following specific embodiments illustrate the implementation manners of the utility model. Those skilled in the art can easily understand other advantages and effects of the utility model from the content disclosed in this specification.

[0025] It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limited conditions under which the utility model can be implemented. Therefore, they do not have a technical essence. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effects that the utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" cited in this specification are only for the convenience of clear description and are not used to limit the scope under which the utility model can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope under which the utility model can be implemented.

[0026] Such as Figure 1 - Figure 2As shown in the figure, the utility model provides a condensate preheating cold air system for a cut tobacco dryer, which is applied to the cut tobacco dryer system; the cut tobacco dryer system includes a cut tobacco dryer 1, a plate heat exchanger 2, a plate condensate pipeline 3, a condensate tank 6, a warm air heat exchanger 10, a warm air condensate pipeline 8, and a warm air conveying pipeline 11. The plate heat exchanger 2 exchanges heat with the cut tobacco dryer 1. The plate condensate pipeline 3 is arranged in the plate heat exchanger 2, and the outlet end of the plate condensate pipeline 3 is connected to the condensate tank 6; the warm air condensate pipeline 8 is arranged in the warm air heat exchanger 10, and the outlet end of the warm air condensate pipeline 8 is connected to the condensate tank 6; steam is introduced into the inlet ends of both the plate condensate pipeline 3 and the warm air condensate pipeline 8; cold air is introduced into the inlet end of the warm air heat exchanger 10. One end of the warm air conveying pipeline 11 is connected to the outlet end of the warm air heat exchanger 10, and the other end of the warm air conveying pipeline 11 is connected to the inside of the cut tobacco dryer 1; the condensate preheating cold air system for the cut tobacco dryer includes a plate condensate preheating component and a warm air condensate preheating component. The plate condensate preheating component uses the heat in the plate condensate to heat the cold air, and the warm air condensate preheating component uses the heat in the warm air condensate to heat the cold air.

[0027] The utility model is provided with a plate condensate preheating component and a warm air condensate preheating component. Plate condensate is introduced into the plate condensate preheating component. The plate condensate has a relatively high temperature, so as to realize heat exchange with the cold air and increase the temperature of the cold air. A warm air condensate preheating component is provided. Warm air condensate is introduced into the warm air condensate preheating component. The warm air condensate has a relatively high temperature, so as to realize heat exchange with the cold air and increase the temperature of the cold air. In this way, the flow rate of steam introduced into the warm air heat exchanger 10 can be reduced.

[0028] Preferably, as Figure 2 shown, a plurality of first steam traps 5 are further arranged on the plate condensate pipeline 3; the plate condensate preheating component includes a plate condensate pipeline branch 14, a steam-water separation tank 13, a plate condensate heat exchanger 15, and a plate condensate regulating valve 16. One end of the plate condensate pipeline branch 14 is connected to the plate condensate pipeline 3 between the plate heat exchanger 2 and the first steam trap 5, and the other end of the plate condensate pipeline branch 14 is connected to the condensate tank 6 through the plate condensate regulating valve 16; the steam-water separation tank 13 and the plate condensate heat exchanger 15 are sequentially arranged on the plate condensate pipeline branch 14; the plate condensate heat exchanger 15 is arranged at the inlet end of the warm air heat exchanger 10. In this embodiment, the steam-water separation tank 13 is used for separating the plate condensate and the steam.

[0029] Preferably, as Figure 2As shown, a plate condensate level gauge 17 is also provided on the steam-water separation tank 13. The plate condensate level gauge 17 is used to measure the liquid level information parameters in the steam-water separation tank 13 and control the opening degree of the plate condensate regulating valve 16 through the liquid level information parameters. Additionally, in this embodiment, the plate condensate level gauge 17 also has the function of stabilizing the plate condensate water level to prevent steam from discharging.

[0030] Preferably, as Figure 2 shown, a first valve 4 is also provided on the plate condensate pipeline 3 on the front side of the first steam trap 5. The first valve 4 is used to control the opening and closing of the plate condensate pipeline 3. In this embodiment, the plate condensate pipeline branch 14 is provided on the plate condensate pipeline 3 between the plate heat exchanger 2 and the first valve 4.

[0031] Preferably, as Figure 2 shown, a number of second steam traps 7 are also provided on the warm air condensate pipeline 8; the warm air condensate preheating assembly includes a warm air condensate pipeline branch 18, a warm air condensate outlet header 19, a warm air condensate heat exchanger 21, and a warm air condensate regulating valve 22. One end of the warm air condensate pipeline branch 18 is connected to the warm air condensate pipeline 8 on the front side of the second steam trap 7, and the other end of the warm air condensate pipeline branch 18 is connected to the condensate tank 6 through the warm air condensate regulating valve 22; the warm air condensate outlet header 19 is provided on the warm air condensate pipeline branch 18; the warm air condensate heat exchanger 21 is provided at the inlet end of the warm air heat exchanger 10. In this embodiment, the warm air condensate outlet header 19 is used for the separation of warm air condensate and steam.

[0032] Preferably, as Figure 2 shown, a warm air condensate level gauge 20 is also provided on the warm air condensate outlet header 19. The warm air condensate level gauge 20 is used to measure the liquid level information parameters in the warm air condensate outlet header 19 and control the opening degree of the warm air condensate regulating valve 22 through the liquid level information parameters.

[0033] Preferably, as Figure 2 shown, a second valve 9 is also provided on the warm air condensate pipeline 8 on the front side of the second steam trap 7. The second valve 9 is used to control the opening and closing of the warm air condensate pipeline 8. In this embodiment, the warm air condensate pipeline branch 18 is connected to the warm air condensate pipeline 8 on the front side of the second valve 9.

[0034] Further, in this embodiment, a control system is also provided in the condensate preheating cold air system of the cut tobacco dryer. The plate condensate level gauge 17, the first valve 4, and the plate condensate regulating valve 16 are all communicatively connected to the control system, and a plate condensate set value is set in the plate condensate level gauge 17. When the plate condensate level gauge 17 detects that the liquid level in the steam-water separator tank 13 is higher than the plate condensate set value, the control system controls the opening of the plate condensate regulating valve 16 to increase; when the plate condensate level gauge 17 detects that the liquid level in the steam-water separator tank 13 is lower than the plate condensate set value, the control system controls the opening of the plate condensate regulating valve 16 to decrease.

[0035] Correspondingly, the warm air condensate level gauge 20, the second valve 9, and the warm air condensate regulating valve 22 are all communicatively connected to the control system, and a warm air condensate set value is set in the warm air condensate level gauge 20. When the warm air condensate level gauge 20 detects that the liquid level in the warm air condensate outlet header 19 is higher than the warm air condensate set value, the control system controls the opening of the warm air condensate regulating valve 22 to increase; when the warm air condensate level gauge 20 detects that the liquid level in the warm air condensate outlet header 19 is lower than the warm air condensate set value, the control system controls the opening of the warm air condensate regulating valve 22 to decrease. In other embodiments, the opening and closing of the second valve 9 and the first valve 4 can also be manually controlled, and the opening of the plate condensate regulating valve 16 and the warm air condensate regulating valve 22 can also be manually controlled.

[0036] Preferably, as Figure 1 、 Figure 2 shown, a blower 12 is also provided in the warm air conveying pipeline 11. The blower 12 is used to blow the heated cold air into the cut tobacco dryer 1 to blow away the moisture separated out during the drying process of the cut tobacco. In this embodiment, the blower 12 is communicatively connected to the control system, and the control system is used to control the opening and closing of the blower 12.

[0037] The condensate preheating cold air system of the cut tobacco dryer involved in the present utility model has the following working steps:

[0038] S1: First, according to the appendix Figure 2 、and the connection relationships between the above-mentioned various components, install the various components;

[0039] S2: Close the first valve 4 and the second valve 9 through the control system to close the passage of the plate condensate pipeline 3 and the warm air condensate pipeline 8 flowing into the condensate tank 6. Open the plate condensate regulating valve 16 and the warm air condensate regulating valve 22. In this way, the plate condensate will enter the steam-water separator tank 13, and the warm air condensate will enter the warm air condensate outlet header 19.

[0040] S3: During the operation of the cut tobacco dryer 1, steam enters the plate heat exchanger 2. The plate heat exchanger 2 exchanges heat with the inner wall of the cut tobacco dryer 1. The plate condensate formed by the steam precipitation enters the steam-water separation tank 13 through the plate condensate pipeline branch 14. Then, the plate condensate will enter the plate condensate heat exchanger 15, where it exchanges heat with the cold air to increase the temperature of the cold air. After heat exchange, the plate condensate passes through the plate condensate regulating valve 16 and enters the condensate tank 6.

[0041] S4: During the operation of the cut tobacco dryer 1, the steam first enters the warm air condensate heat exchanger 10 through the warm air condensate pipeline 8. The warm air condensate heat exchanger 10 exchanges heat with the cold air to increase the temperature of the cold air. After heat exchange, the warm air condensate passes through the warm air condensate pipeline branch 18 and enters the warm air condensate heat exchanger 21. The warm air condensate heat exchanger 21 exchanges heat with the cold air to increase the temperature of the cold air. After heat exchange, the warm air condensate passes through the warm air condensate regulating valve 22 and enters the condensate tank 6.

[0042] S5: The control system starts the blower 12. The blower 12 operates to blow the heated cold air into the cut tobacco dryer 1, and the heated cold air takes away the moisture precipitated during the drying process of the cut tobacco.

[0043] Further, in step S3, the plate condensate level gauge 17 continuously detects the liquid level in the steam-water separation tank 13. When the liquid level exceeds the set value, the plate condensate level gauge 17 feeds back information to the control system, and the control system increases the opening of the plate condensate regulating valve 16; when the liquid level is less than the set value, the plate condensate level gauge 17 feeds back information to the control system, and the control system reduces the opening of the plate condensate regulating valve 16.

[0044] Further, in step S4, the warm air condensate level gauge 20 continuously detects the liquid level in the warm air condensate outlet header 19. When the liquid level exceeds the set value, the warm air condensate level gauge 20 feeds back information to the control system, and the control system increases the opening of the warm air condensate regulating valve 22; when the liquid level is less than the set value, the warm air condensate level gauge 20 feeds back information to the control system, and the control system reduces the opening of the warm air condensate regulating valve 22.

[0045] Further, as Figure 2As shown in the figure, the cold air first enters the warm air condensate heat exchanger 21 for heat exchange, then enters the plate condensate heat exchanger 15 for heat exchange, and finally enters the warm air heat exchanger 10 for heat exchange. Among them, the temperature of the warm air condensate heat exchanger 21 is lower than that in the plate condensate heat exchanger 15, and the temperature in the plate condensate heat exchanger 15 is lower than that in the warm air heat exchanger 10. During the process of flowing through the three, the temperature of the cold air gradually increases. In other words, the warm air condensate heat exchanger 21 serves as the first-stage preheating device for the cold air, the plate condensate heat exchanger 15 serves as the second-stage preheating device for the cold air, and the warm air heat exchanger 10 serves as the third-stage preheating device. In other embodiments, corresponding temperature monitoring devices may also be provided to determine whether the temperature of the cold air meets the standard, which will not be elaborated here.

[0046] The condensate preheating cold air system of the cigarette making machine involved in the present utility model has the following beneficial effects:

[0047] 1. The present utility model has the characteristics of simple structure, convenient operation and high reliability. After the plate condensate water after passing through the plate heat exchanger 2 and the warm air condensate water after heating the cold air preheat the cold air, they are then discharged into the condensate water tank 6, saving the steam consumption for heating the cold air and can be directly promoted and applied.

[0048] 2. The present utility model fully considers the compatibility with the original cigarette making machine system. The added condensate preheating cold air system of the cigarette making machine is connected in parallel with the cigarette making machine system, causing no obstacles or losses to the operation of the cigarette making machine system, and can be switched back at any time, with great flexibility and reliability.

[0049] 3. The present utility model utilizes the condensate preheating cold air system of the cigarette making machine to effectively reduce the steam amount required for heating the cold air, achieving the effect of energy conservation.

[0050] 4. The present utility model can operate in parallel with the original cigarette making machine system, without affecting the normal operation of the original cigarette making machine system, greatly reducing the water temperature of the condensate water tank 6, eliminating the flash steam of the condensate water tank 6, reducing the steam consumption of the warm air heat exchanger 10, and improving the energy utilization efficiency.

[0051] Therefore, the present utility model effectively overcomes various shortcomings in the prior art and has high industrial utilization value.

[0052] The above embodiments only illustratively explain the principle and efficacy of the present utility model, rather than limiting the present utility model. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present utility model. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present utility model should still be covered by the claims of the present utility model.

Claims

1. A condensate preheating cold air system for a cut tobacco dryer, which is applied to a cut tobacco dryer system; the cut tobacco dryer system includes a cut tobacco dryer (1), a plate heat exchanger (2), a plate condensate pipeline (3), a condensate tank (6), a warm air heat exchanger (10), a warm air condensate pipeline (8), and a warm air delivery pipeline (11). The plate heat exchanger (2) exchanges heat with the cut tobacco dryer (1). The plate condensate pipeline (3) is arranged in the plate heat exchanger (2), and the outlet end of the plate condensate pipeline (3) is connected to the condensate tank (6). The warm air condensate pipeline (8) is arranged in the warm air heat exchanger (10), and the outlet end of the warm air condensate pipeline (8) is connected to the condensate tank (6). Steam is introduced into the inlet ends of both the plate condensate pipeline (3) and the warm air condensate pipeline (8). Cold air is introduced into the inlet end of the warm air heat exchanger (10). One end of the warm air delivery pipeline (11) is connected to the outlet end of the warm air heat exchanger (10), and the other end of the warm air delivery pipeline (11) is connected to the inside of the cut tobacco dryer (1). It is characterized in that: The condensate preheating cold air system for the cut tobacco dryer includes a plate condensate preheating component and a warm air condensate preheating component. The plate condensate preheating component uses the heat in the plate condensate to heat the cold air, and the warm air condensate preheating component uses the heat in the warm air condensate to heat the cold air.

2. The condensate preheating cold air system of the cut tobacco dryer according to claim 1, wherein: A plurality of first steam traps (5) are further arranged on the plate condensate pipeline (3). The plate condensate preheating component includes a plate condensate pipeline branch (14), a steam-water separation tank (13), a plate condensate heat exchanger (15), and a plate condensate regulating valve (16). One end of the plate condensate pipeline branch (14) is connected to the plate condensate pipeline (3) between the plate heat exchanger (2) and the first steam trap (5), and the other end of the plate condensate pipeline branch (14) is connected to the condensate tank (6) through the plate condensate regulating valve (16). The steam-water separation tank (13) and the plate condensate heat exchanger (15) are sequentially arranged on the plate condensate pipeline branch (14). The plate condensate heat exchanger (15) is arranged at the inlet end of the warm air heat exchanger (10).

3. The condensate preheating cold air system of the cut tobacco dryer according to claim 2, characterized in that: A plate condensate level gauge (17) is further arranged on the steam-water separation tank (13). The plate condensate level gauge (17) is used to measure the liquid level information parameters in the steam-water separation tank (13) and control the opening degree of the plate condensate regulating valve (16) through the liquid level information parameters.

4. The condensate preheating cold air system of the cut tobacco dryer according to claim 2, characterized in that: A first valve (4) is further arranged on the plate condensate pipeline (3) in front of the first steam trap (5). The first valve (4) is used to control the opening and closing of the plate condensate pipeline (3).

5. The condensate preheating cold air system of the cut tobacco dryer according to claim 1, characterized in that: A plurality of second steam traps (7) are further arranged on the warm air condensate pipeline (8); the warm air condensate preheating assembly comprises a warm air condensate pipeline branch (18), a warm air condensate outlet header (19), a warm air condensate heat exchanger (21), and a warm air condensate regulating valve (22). One end of the warm air condensate pipeline branch (18) is connected to the warm air condensate pipeline (8) on the front side of the second steam trap (7), and the other end of the warm air condensate pipeline branch (18) is connected to the condensate tank (6) through the warm air condensate regulating valve (22); the warm air condensate outlet header (19) is arranged on the warm air condensate pipeline branch (18); the warm air condensate heat exchanger (21) is arranged at the inlet end of the warm air heat exchanger (10).

6. The condensate preheating cold air system of the cut tobacco dryer according to claim 5, wherein: A warm air condensate level gauge (20) is further arranged on the warm air condensate outlet header (19). The warm air condensate level gauge (20) is used for measuring the liquid level information parameter in the warm air condensate outlet header (19) and controlling the opening degree of the warm air condensate regulating valve (22) through the liquid level information parameter.

7. The condensate preheating cold air system of the cigarette cut - tobacco dryer according to claim 5, characterized in that: A second valve (9) is further arranged on the warm air condensate pipeline (8) on the front side of the second steam trap (7). The second valve (9) is used for controlling the opening and closing of the warm air condensate pipeline (8).

8. The condensate preheating cold air system of the cut tobacco dryer according to claim 1, characterized in that: A blower (12) is further arranged in the warm air conveying pipeline (11).

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