Energy-saving device of hot air leaf moistening machine

Abstract

The utility model discloses an energy-saving device of a hot air leaf moistening machine, which comprises a heat exchange box, the outlet end of the heat exchange box is connected with a condensate water collecting pipe, and the end part of the condensate water collecting pipe is connected with a flash tank through a connecting pipe. A first stop valve, a first filter, a first drain valve and a second stop valve are sequentially arranged outside a connecting pipe between the condensate water collecting pipe and the flash tank, a communicating pipe is arranged at the top end of the flash tank, and two branch pipes are formed at the end of the communicating pipe and connected with a feeding hopper mixing nozzle and a discharging hopper mixing nozzle respectively. Low-pressure flash steam generated after high-pressure condensate water in the flash tank is decompressed reaches the feeding hopper mixing nozzle and the discharging hopper mixing nozzle through the communicating pipe, and the high-pressure condensate water generated in the heat exchange box of the energy-saving device of the hot air leaf moistening machine is decompressed in the flash tank to generate low-pressure flash steam and low-pressure condensate water. Flash steam is supplied to the feeding hopper mixing nozzle and the discharging hopper mixing nozzle, a boiler does not need to supply steam, and the total steam consumption of the hot air leaf moistening machine is reduced.

Description

Technical Field

[0001] This utility model relates to the field of tobacco leaf threshing and re-drying technology, specifically an energy-saving device for a hot air leaf humidifier. Background Technology

[0002] In the tobacco threshing and re-drying industry, the drum-type hot air humidifier is one of the main pieces of equipment on the threshing and re-drying production line. It has the function of heating and humidifying tobacco leaves. After being heated and humidified by hot air and atomized water inside the drum, the temperature and humidity of the tobacco leaves are appropriately increased, making the tobacco leaves softer, looser, and more resilient. This type of hot air humidifier also has the function of blending various tobacco leaves and untying some tobacco bundles that the untying machine could not untie. The drum-type hot air humidifier is mainly composed of a frame, feed hopper, discharge hopper, drum, circulating air duct, control system, and water-steam-gas system. The main function of the circulating air duct is to heat the material by heating the circulating air. Low-temperature gas and high-temperature steam exchange heat in the heat exchange box of the water-steam-gas system, producing high-pressure condensate. The high-pressure condensate produced in the heat exchange box has a pressure ≥0.8MPa and a temperature ≥175℃. The steam consumption in the heat exchanger of a 3050×12000 hot air leaf humidifier reaches approximately 1250 kg / h, making steam consumption one of the main energy-consuming aspects of the machine. Currently, the high-pressure condensate generated in the heat exchanger of the existing hot air leaf humidifier is recovered to the boiler through pipelines, meaning the heat from the condensate cannot be fully utilized. Therefore, we propose an energy-saving device for the hot air leaf humidifier. Utility Model Content

[0003] The purpose of this utility model is to provide an energy-saving device for a hot air leaf humidifier to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution: an energy-saving device for a hot air leaf humidifier, comprising a heat exchange box, the outlet end of which is connected to a condensate collection pipe, the end of which is connected to a flash tank via a connecting pipe, and the connecting pipe between the condensate collection pipe and the flash tank is sequentially provided with a first shut-off valve, a first filter, a first drain valve, and a second shut-off valve, the top of which is provided with a connecting pipe, and the end of which forms two branch pipes respectively connected to a mixing nozzle in the feed hopper and a mixing nozzle in the discharge hopper, the low-pressure flash steam generated after the high-pressure condensate in the flash tank is depressurized reaches the mixing nozzle in the feed hopper and the mixing nozzle in the discharge hopper through the connecting pipe, and the outside of the connecting pipe at the top of the flash tank is sequentially provided with a third shut-off valve, a first pressure gauge, and a fourth shut-off valve.

[0005] Preferably, the bottom end of the flash tank is connected to a water pipe, and the end of the water pipe is connected to the connecting pipe between the condensate collection pipe and the first shut-off valve. The outer side of the water pipe at the bottom end of the flash tank is sequentially provided with a sixth shut-off valve, a second filter, a second drain valve, an eighth shut-off valve, a drain, and a ninth shut-off valve.

[0006] Preferably, a condensate recovery pipe is connected to the outside of the water pipe at the bottom of the flash tank, located between the eighth shut-off valve and the second drain valve, and a seventh shut-off valve and a check valve are sequentially installed on the outside of the condensate recovery pipe.

[0007] Preferably, a supplementary pipe is connected to the outside of the connecting pipe at the top of the flash tank between the first pressure gauge and the fourth shut-off valve, and the end of the supplementary pipe is connected to the main steam pipe.

[0008] Preferably, a flow meter, a pressure reducing valve, a second pressure gauge, and a fifth shut-off valve are sequentially installed on the outer side of the supplementary pipe connected to the main steam pipe.

[0009] Compared with existing technologies, the beneficial effects of this invention are as follows: The high-pressure condensate generated in the heat exchanger is depressurized in the flash tank to produce low-pressure flash steam and low-pressure condensate. The flash steam is supplied to the mixing nozzles in the feed hopper and discharge hopper, eliminating the need for a boiler and saving the total steam consumption of the hot air leaf humidifier. Even if the amount of flash steam generated in the flash tank is insufficient to meet the needs of the mixing nozzles in the feed hopper and discharge hopper, it can be supplemented by the main steam pipe, still saving the total steam consumption of the hot air leaf humidifier. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the principle of this utility model.

[0011] In the diagram: 1. Heat exchanger; 2. Condensate collection pipe; 3. First shut-off valve; 4. First filter; 5. First steam trap; 6. Second shut-off valve; 7. Flash tank; 8. Third shut-off valve; 9. First pressure gauge; 10. Fourth shut-off valve; 11. Feed hopper mixing nozzle; 12. Discharge hopper mixing nozzle; 13. Flow meter; 14. Main steam pipe; 15. Pressure reducing valve; 16. Second pressure gauge; 17. Fifth shut-off valve; 18. Sixth shut-off valve; 19. Second filter; 20. Second steam trap; 21. Seventh shut-off valve; 22. Check valve; 23. Eighth shut-off valve; 24. Drain; 25. Ninth shut-off valve. Detailed Implementation

[0012] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0013] Please see Figure 1 This utility model provides a technical solution: an energy-saving device for a hot air leaf humidifier, including a heat exchange box 1, a condensate collection pipe 2 connected to the outlet end of the heat exchange box 1, a flash tank 7 connected to the end of the condensate collection pipe 2 via a connecting pipe, and a first shut-off valve 3, a first filter 4, a first drain valve 5 and a second shut-off valve 6 sequentially arranged outside the connecting pipe between the condensate collection pipe 2 and the flash tank 7.

[0014] It should be noted that if the amount of low-pressure flash steam generated in the flash tank 7 is sufficient for the use of the mixing nozzle 11 in the feed hopper and the mixing nozzle 12 in the discharge hopper, there is no need to supplement steam. Close the ninth shut-off valve 25 and the fifth shut-off valve 17, and open the first shut-off valve 3, the second shut-off valve 6, the third shut-off valve 8 and the fourth shut-off valve 10. The high-pressure condensate in the condensate collection pipe 2 enters the flash tank 7 through the first shut-off valve 3, the first filter 4, the first drain valve 5 and the second shut-off valve 6.

[0015] The top of the flash tank 7 is provided with a connecting pipe, and the end of the connecting pipe forms two branch pipes that are respectively connected to the feed hopper mixing nozzle 11 and the discharge hopper mixing nozzle 12. The low-pressure flash steam generated after the high-pressure condensate in the flash tank 7 is depressurized reaches the feed hopper mixing nozzle 11 and the discharge hopper mixing nozzle 12 through the connecting pipe. The third shut-off valve 8, the first pressure gauge 9 and the fourth shut-off valve 10 are installed in sequence on the outside of the connecting pipe at the top of the flash tank 7.

[0016] It should be noted that after the high-pressure condensate in the flash tank 7 is depressurized, low-pressure flash steam and low-pressure condensate are generated. The low-pressure flash steam enters the mixing nozzle 11 of the feed hopper and the mixing nozzle 12 of the discharge hopper through the third shut-off valve 8 and the fourth shut-off valve 10. Steam is not required from the boiler, which saves the total steam consumption of the hot air leaf humidifier. The first pressure gauge 9 can read the pressure of the low-pressure flash steam generated in the flash tank 7.

[0017] The bottom of the flash tank 7 is connected to a water pipe, and the end of the water pipe is connected to the connecting pipe between the condensate collection pipe 2 and the first shut-off valve 3. The sixth shut-off valve 18, the second filter 19, the second drain valve 20, the eighth shut-off valve 23, the trench 24 and the ninth shut-off valve 25 are arranged in sequence on the outside of the water pipe at the bottom of the flash tank 7.

[0018] It should be noted that the low-pressure condensate generated in the flash tank 7 is recycled again through the sixth shut-off valve 18, the second filter 19, the second steam trap 20, the seventh shut-off valve 21, and the check valve 22.

[0019] A condensate recovery pipe is connected to the outside of the water pipe at the bottom of the flash tank 7 between the eighth shut-off valve 23 and the second steam trap 20, and the seventh shut-off valve 21 and the check valve 22 are installed in sequence on the outside of the condensate recovery pipe.

[0020] It should be noted that if the low-pressure condensate does not need to be recycled, the seventh shut-off valve 21 can be closed and the eighth shut-off valve 23 can be opened. The low-pressure condensate will then pass through the sixth shut-off valve 18, the second filter 19, the second drain valve 20 and the eighth shut-off valve 23 into the drain 24.

[0021] A supplementary pipe is connected to the outside of the connecting pipe at the top of the flash tank 7 between the first pressure gauge 9 and the fourth shut-off valve 10, and the end of the supplementary pipe is connected to the main steam pipe 14.

[0022] It should be noted that the high-pressure condensate generated by the heat exchanger 1 of this invention enters the condensate collection pipe 2. The high-pressure condensate then passes through the first shut-off valve 3, the first filter 4, the first steam trap 5, and the second shut-off valve 6 before entering the flash tank 7. In the flash tank 7, the high-pressure condensate is depressurized to generate low-pressure flash steam and low-pressure condensate. The low-pressure flash steam passes through the third shut-off valve 8 and the fourth shut-off valve 10 before entering the mixing nozzle 11 in the feed hopper and the mixing nozzle 12 in the discharge hopper. The first pressure gauge 9 can read the pressure of the low-pressure flash steam generated in the flash tank 7. The flash steam and the boiler steam have the same energy, and the flash steam is fully utilized, saving the total steam volume of the hot air leaf humidifier. The low-pressure condensate generated in the flash tank 7 is then recycled again through the sixth shut-off valve 18, the second filter 19, the second steam trap 20, the seventh shut-off valve 21, and the check valve 22. If low-pressure condensate does not need to be recycled, the seventh shut-off valve 21 can be closed and the eighth shut-off valve 23 can be opened. The low-pressure condensate then enters the drain 24 through the sixth shut-off valve 18, the second filter 19, the second drain valve 20, and the eighth shut-off valve 23. If the total amount of low-pressure flash steam generated in the flash tank 7 cannot meet the steam demand of the feed hopper mixing nozzle 11 and the discharge hopper mixing nozzle 12, the insufficient steam can be supplemented through the main steam pipe 14. The supplementary steam enters the feed hopper mixing nozzle 11 and the discharge hopper mixing nozzle 12 through the flow meter 13, the pressure reducing valve 15, the fifth shut-off valve 17, and the fourth shut-off valve 10. The flow meter 13 can measure the amount of supplementary steam used. The steam pressure in the main steam pipe 14 is relatively high. It is reduced to the pressure required by the pressure reducing valve 15. The second pressure gauge 16 can read the pressure after the pressure reduction valve 15. Since the steam used by the mixing nozzle 11 in the feed hopper and the mixing nozzle 12 in the discharge hopper is steam after high-pressure condensate flash evaporation, it does not need to be supplied by the boiler, thus saving the total steam consumption of the hot air leaf humidifier.

[0023] The high-pressure condensate generated in heat exchanger 1 can be reused and recycled. If the amount of low-pressure flash steam generated in flash tank 7 is sufficient for use by the mixing nozzles 11 in the feed hopper and 12 in the discharge hopper, no additional steam is needed. Close the ninth shut-off valve 25 and the fifth shut-off valve 17, and open the first shut-off valve 3, the second shut-off valve 6, the third shut-off valve 8, and the fourth shut-off valve 10. The high-pressure condensate in the condensate collection pipe 2 enters the flash tank 7 through the first shut-off valve 3, the first filter 4, the first drain valve 5, and the second shut-off valve 6. After the high-pressure condensate in the flash tank 7 is depressurized, low-pressure flash steam and low-pressure condensate are generated. The low-pressure flash steam enters the mixing nozzles 11 in the feed hopper and 12 in the discharge hopper through the third shut-off valve 8 and the fourth shut-off valve 10. Steam is not required from the boiler, thus saving the total steam consumption of the hot air leaf humidifier. The low-pressure condensate generated in flash tank 7 is recovered through the sixth shut-off valve 18, the second filter 19, the second steam trap 20, the seventh shut-off valve 21, and the check valve 22. The function of the check valve 22 is to allow the condensate to flow in only one direction and prevent the condensate from flowing back. At this time, the eighth shut-off valve 23 is closed.

[0024] If the low-pressure flash steam generated in flash tank 7 is insufficient for the mixing nozzles 11 and 12 in the feed hopper, additional steam is required. In this case, the fifth shut-off valve 17 is opened, and the steam in the main steam pipe 14 enters the mixing nozzles 11 and 12 in the feed hopper through the flow meter 13, pressure reducing valve 15, fifth shut-off valve 17, and fourth shut-off valve 10, ensuring that the mixing nozzles 11 and 12 in the feed hopper and the discharge hopper are used normally. The steam in the main steam pipe 14 is provided by the boiler. Although some steam needs to be added in this case, it also saves the total steam consumption of the hot air leaf humidifier.

[0025] If the flash tank 7 is not working properly, the first shut-off valve 3 and the third shut-off valve 8 can be closed for maintenance of the flash tank 7. At the same time, the ninth shut-off valve 25 can be opened, and the high-pressure condensate in the condensate collection pipe 2 can be directly discharged into the trench 24 through the ninth shut-off valve 25. In order to ensure that the mixing nozzle 11 of the feed hopper and the mixing nozzle 12 of the discharge hopper can work properly, the fifth shut-off valve 17 and the fourth shut-off valve 10 can be opened. The steam in the main steam pipe 14 can enter the mixing nozzle 11 of the feed hopper and the mixing nozzle 12 of the discharge hopper through the flow meter 13, the pressure reducing valve 15, the fifth shut-off valve 17, and the fourth shut-off valve 10. Although this method does not save energy, it can ensure that the mixing nozzle 11 of the feed hopper and the mixing nozzle 12 of the discharge hopper can work properly when the flash tank 7 needs maintenance.

[0026] The main steam pipe 14 is connected to a supplementary pipe and is sequentially equipped with a flow meter 13, a pressure reducing valve 15, a second pressure gauge 16, and a fifth shut-off valve 17.

[0027] It should be noted that if the amount of low-pressure flash steam generated in the flash tank 7 is insufficient for the use of the feed hopper mixing nozzle 11 and the discharge hopper mixing nozzle 12, steam needs to be supplemented. At this time, the fifth shut-off valve 17 is opened, and the steam in the main steam pipe 14 enters the feed hopper mixing nozzle 11 and the discharge hopper mixing nozzle 12 through the flow meter 13, pressure reducing valve 15, fifth shut-off valve 17, and fourth shut-off valve 10, ensuring that the feed hopper mixing nozzle 11 and the discharge hopper mixing nozzle 12 are used normally. The steam in the main steam pipe 14 is provided by the boiler. Although some steam needs to be supplemented in this case, it also saves the total steam consumption of the hot air leaf humidifier.

[0028] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0029] Furthermore, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first," "second," "third," or "fourth" may explicitly or implicitly include at least one of those features.

[0030] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An energy-saving device for a hot air leaf humidifier, characterized in that, The system includes a heat exchange box (1), the outlet end of which is connected to a condensate collection pipe (2), the end of which is connected to a flash tank (7) via a connecting pipe, and the outside of the connecting pipe between the condensate collection pipe (2) and the flash tank (7) is sequentially provided with a first shut-off valve (3), a first filter (4), a first drain valve (5), and a second shut-off valve (6). The top of the flash tank (7) is provided with a connecting pipe, and the end of the connecting pipe forms two branch pipes that are respectively connected to the feed hopper mixing nozzle (11) and the discharge hopper mixing nozzle (12). The low-pressure flash steam generated after the high-pressure condensate in the flash tank (7) is depressurized reaches the feed hopper mixing nozzle (11) and the discharge hopper mixing nozzle (12) through the connecting pipe. The outside of the connecting pipe at the top of the flash tank (7) is sequentially provided with a third shut-off valve (8), a first pressure gauge (9), and a fourth shut-off valve (10).

2. The energy-saving device for a hot air leaf humidifier according to claim 1, characterized in that: The bottom end of the flash tank (7) is connected to a water pipe, and the end of the water pipe is connected to the connecting pipe between the condensate collection pipe (2) and the first shut-off valve (3). The sixth shut-off valve (18), the second filter (19), the second drain valve (20), the eighth shut-off valve (23), the trench (24), and the ninth shut-off valve (25) are arranged in sequence on the outside of the water pipe at the bottom end of the flash tank (7).

3. The energy-saving device for a hot air leaf humidifier according to claim 2, characterized in that: The flash tank (7) has a condensate recovery pipe connected to the outside of the water pipe at the bottom, between the eighth shut-off valve (23) and the second steam trap (20). The seventh shut-off valve (21) and the check valve (22) are installed on the outside of the condensate recovery pipe in sequence.

4. The energy-saving device for a hot air leaf humidifier according to claim 1, characterized in that: The outer side of the connecting pipe at the top of the flash tank (7) is connected to a supplementary pipe between the first pressure gauge (9) and the fourth shut-off valve (10), and the end of the supplementary pipe is connected to the main steam pipe (14).

5. The energy-saving device for a hot air leaf humidifier according to claim 4, characterized in that: The main steam pipe (14) is connected to a supplementary pipe and is sequentially equipped with a flow meter (13), a pressure reducing valve (15), a second pressure gauge (16), and a fifth shut-off valve (17).

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