Heat exchanger, thin-plate cut tobacco dryer and heat exchange method

Abstract

The invention belongs to the technical field of heat exchange, and discloses a heat exchanger, a thin-plate cut tobacco dryer and a heat exchange method. The heat exchanger is used for recycling heat of condensate water discharged by the thin-plate cut-tobacco dryer, an air inlet and an air outlet are formed in the shell, the air outlet directly faces an air inlet of the hot air heat exchanger of the thin-plate cut-tobacco dryer, an inlet of the heat exchange pipe is communicated with a water inlet pipe, and a water outlet of the heat exchange pipe is communicated with a water outlet pipe. The inlet of the water inlet pipe is communicated with the discharge outlet of the condensate water recovery system of the thin-plate cut-tobacco dryer, and the outlet of the water outlet pipe is communicated with the outside, so that heat of condensate water discharged by the thin-plate cut-tobacco dryer can be recovered, and the drying cost of cut tobacco is further reduced. The thin-plate cut-tobacco drier comprises the heat exchanger, the steam preparation amount needed by the thin-plate cut-tobacco drier for drying cut tobacco can be reduced, and then the drying cost of the cut tobacco is reduced. The heat exchange method is applied to the heat exchanger, and heat of condensate water discharged by the thin-plate cut-tobacco drier can be recycled.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchange, and in particular to a heat exchanger, a thin plate tobacco dryer, and a heat exchange method. Background Art

[0002] In the tobacco leaf processing technology, a thin plate tobacco dryer is required to dry the cut tobacco leaves so that the moisture content, filling rate, and curling degree of the tobacco leaves all reach the process requirements, improving the physical properties and sensory quality of the tobacco leaves.

[0003] The thin plate tobacco dryer needs to consume a large amount of steam to obtain the hot air required for drying the tobacco leaves and heat the thin plate. Preparing steam results in a high drying cost for the tobacco leaves. The steam heats the thin plate and the room temperature air and then condenses into water, and the condensed water is recovered by the condensed water recovery system of the thin plate tobacco dryer. However, there is back pressure in the condensed water recovery system, resulting in poor discharge of the condensed water. To ensure the stability of the tobacco drying quality of the thin plate tobacco dryer, the thin plate tobacco dryer directly discharges the condensed water, so the condensed water cannot be effectively recovered and reused. Moreover, the temperature of the condensed water is relatively high, and the heat it possesses cannot be recovered and reused, resulting in waste of heat.

[0004] Therefore, there is an urgent need for a heat exchanger, a thin plate tobacco dryer, and a heat exchange method to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a heat exchanger, a thin plate tobacco dryer, and a heat exchange method, which can recover and reuse the heat possessed by the condensed water discharged by the thin plate tobacco dryer, and at the same time reduce the drying cost of the tobacco leaves.

[0006] To achieve this purpose, the present invention adopts the following technical solutions:

[0007] In a first aspect, a heat exchanger is provided for recovering the heat possessed by the condensed water discharged by a thin plate tobacco dryer. The heat exchanger includes:

[0008] A housing, in which a receiving cavity is provided. An air inlet and an air outlet are respectively opened on the housing, and the air inlet and the air outlet are respectively communicated with the receiving cavity. The air outlet is directly opposite to the hot air heat exchanger air inlet of the thin plate tobacco dryer;

[0009] A heat exchange module, which is arranged in the receiving cavity. The heat exchange module includes a water inlet pipe, a heat exchange pipe, and a water outlet pipe. The inlet of the heat exchange pipe is communicated with the water inlet pipe, the outlet of the heat exchange pipe is communicated with the water outlet pipe, the inlet of the water inlet pipe is communicated with the discharge port of the condensed water recovery system of the thin plate tobacco dryer, and the outlet of the water outlet pipe is communicated with the outside.

[0010] Preferably, the heat exchange module includes at least two heat exchange pipes, and at least two heat exchange pipes are arranged at intervals.

[0011] Preferably, the heat exchange tube has N water pipes, the outlet of the (N - 1)-th water pipe is communicated with the inlet of the N-th water pipe, the N water pipes are arranged side by side, the inlet of the first water pipe is used as the inlet of the heat exchange tube, and the outlet of the N-th water pipe is used as the outlet of the heat exchange tube.

[0012] Preferably, the heat exchange module further includes a heat dissipation member, the heat dissipation member is fixedly connected to the housing and is located in the accommodation cavity, a through hole facing the water pipe is formed on the heat dissipation member, and the water pipe passes through the through hole and contacts the heat dissipation member.

[0013] Preferably, the heat exchange module includes at least two heat dissipation members, and the at least two heat dissipation members are arranged at intervals along the length direction of the water pipe.

[0014] Preferably, the heat exchanger further includes a condensate inlet and outlet assembly, and the condensate inlet and outlet assembly includes:

[0015] A drain pipe, the drain pipe is arranged in the vertical direction, the inlet of the drain pipe is communicated with the discharge port of the condensate recovery system of the thin plate tobacco dryer, and the outlet of the drain pipe is communicated with the outside;

[0016] A condensate inlet pipe, the inlet of the condensate inlet pipe is communicated with the drain pipe, and the outlet of the condensate inlet pipe is communicated with the inlet of the water inlet pipe;

[0017] A condensate outlet pipe, the outlet of the condensate outlet pipe is communicated with the drain pipe, the inlet of the condensate outlet pipe is communicated with the outlet of the water outlet pipe, and the condensate inlet pipe and the condensate outlet pipe are arranged at intervals in the vertical direction;

[0018] A first valve, the first valve is arranged on the drain pipe and is located between the connection of the condensate inlet pipe and the drain pipe and the connection of the condensate outlet pipe and the drain pipe.

[0019] Preferably, a first flow valve is arranged on the condensate inlet pipe and / or a second flow valve is arranged on the condensate outlet pipe, so that...

[0020] Preferably, a floor drain cover plate is coaxially arranged at one end of the outlet of the drain pipe.

[0021] Preferably, a first temperature measuring element is arranged on the condensate inlet pipe, and a second temperature measuring element is arranged on the condensate outlet pipe.

[0022] Preferably, the heat exchanger further includes a runner, the rotating shaft of the runner is rotatably connected to the housing, the outlet of the condensate inlet pipe is connected to the inlet of the water inlet pipe through a water conveying hose, and the inlet of the condensate outlet pipe is communicated with the outlet of the water outlet pipe through a water conveying hose.

[0023] Preferably, the heat exchanger further includes a filter screen, which is detachably installed on the housing and used to shield the air inlet.

[0024] Preferably, a through hole is formed in the side wall of the housing corresponding to the air outlet, and a third temperature measuring element is fixed at the through hole, and the third temperature measuring element can detect the temperature at the air outlet.

[0025] In a second aspect, a thin plate tobacco dryer is provided, including the above heat exchanger. It is characterized in that the air inlet of the hot air heat exchanger of the thin plate tobacco dryer faces the air outlet, and the inlet of the water inlet pipe is communicated with the condensate discharge port of the thin plate tobacco dryer.

[0026] In a third aspect, a heat exchange method is provided, which is applied to the above thin plate tobacco dryer. It is characterized in that the condensate discharged from the condensate discharge port of the thin plate tobacco dryer exchanges heat with the room temperature air, and the room temperature air after heat exchange flows into the air inlet of the hot air heat exchanger of the thin plate tobacco dryer.

[0027] Advantages of the present invention:

[0028] In the heat exchanger provided by the present invention, the heat exchange module is arranged in the accommodation cavity of the housing, and an air inlet and an air outlet are formed in the housing, so that the air outlet faces the air inlet of the hot air heat exchanger of the thin plate tobacco dryer. The inlet of the heat exchange tube is communicated with the water inlet pipe, the outlet of the heat exchange tube is communicated with the water outlet pipe, the inlet of the water inlet pipe is communicated with the condensate recovery system discharge port of the thin plate tobacco dryer, and the outlet of the water outlet pipe is communicated with the outside. Thus, the condensate discharged from the thin plate tobacco dryer can flow into the heat exchange tube from the water inlet pipe, exchange heat with the room temperature air in the accommodation cavity of the housing of the heat exchanger to heat the room temperature air, and flow out to the outside through the water outlet pipe. Furthermore, the heat of the condensate discharged from the thin plate tobacco dryer is recovered. The room temperature air can flow into the accommodation cavity from the air inlet of the housing, and after heat exchange with the condensate in the heat exchange tube, it flows into the air inlet of the hot air heat exchanger of the thin plate tobacco dryer through the air outlet, thereby providing hot air for the thin plate tobacco dryer, reducing the amount of steam prepared for drying tobacco by the thin plate tobacco dryer, and further reducing the drying cost of tobacco.

[0029] The thin plate tobacco dryer provided by the present invention includes the above heat exchanger, which can reduce the amount of steam prepared for drying tobacco by the thin plate tobacco dryer, and further reduce the drying cost of tobacco.

[0030] The heat exchange method provided by the present invention, when applied to the above heat exchanger, can recover the heat of the condensate discharged from the thin plate tobacco dryer. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a schematic structural diagram of the heat exchanger provided by an embodiment of the present invention;

[0032] Figure 2 is a schematic structural diagram of the housing provided by the embodiment of the present invention;

[0033] Figure 3 is a schematic structural diagram of the heat exchange module provided by the embodiment of the present invention;

[0034] Figure 4 is a schematic structural diagram of the condensate inlet and outlet assembly provided by the embodiment of the present invention.

[0035] In the figure:

[0036] 1. Housing; 11. Accommodating cavity; 12. Air inlet; 13. Air outlet;

[0037] 2. Heat exchange module; 21. Water inlet pipe; 22. Heat exchange pipe; 221. Water delivery pipe; 23. Water outlet pipe; 24. Heat dissipation member;

[0038] 3. Condensate inlet and outlet assembly; 31. Drain pipe; 32. Condensate inlet pipe; 33. Condensate outlet pipe;

[0039] 34. First valve; 35. First flow valve; 36. Second flow valve; 37. Floor drain cover plate; 38. First temperature measuring element; 39. Second temperature measuring element;

[0040] 4. Runner;

[0041] 5. Filter screen;

[0042] 6. Third temperature measuring element. Detailed implementation manners

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present invention, rather than limiting the present invention. In addition, it should be noted that, for the convenience of description, only some parts related to the present invention are shown in the drawings, rather than all the structures.

[0044] In the description of the present invention, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" 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.

[0045] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes that the first feature is directly above and obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than that of the second feature.

[0046] In the description of this embodiment, the orientation or positional relationships such as "up", "down", "right", etc. are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, 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. Therefore, it should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0047] The thin plate tobacco dryer needs to consume a large amount of steam to obtain the hot air required for drying the tobacco leaves and heat the thin plates. Preparing steam results in a high drying cost for the tobacco leaves. The steam heats the thin plates and the room temperature air and then condenses into water, while the condensate recovery system directly discharges the condensate and cannot effectively recover and reuse the heat possessed by the condensate. Therefore, recovering the heat possessed by the condensate is the key to reducing the drying cost of the tobacco leaves. The following will introduce in detail Figures 1 to 4 the heat exchanger, the thin plate tobacco dryer and the heat exchange method provided in this embodiment.

[0048] Figure 1 shows a schematic structural diagram of the heat exchanger provided in this embodiment. Figure 2 shows a schematic structural diagram of the housing 1 provided in this embodiment. Figure 3 shows a schematic structural diagram of the heat exchange module 2 provided in this embodiment. As Figures 1 to 3As shown in the figure, the heat exchanger provided in this embodiment is used to recover the heat of the condensed water discharged by the thin plate tobacco drying machine. The heat exchanger includes a housing 1 and a heat exchange module 2. A receiving cavity 11 is provided inside the housing 1. An air inlet 12 and an air outlet 13 are respectively opened on the housing 1. The air inlet 12 and the air outlet 13 are respectively communicated with the receiving cavity 11, and the air outlet 13 is directly opposite to the hot air heat exchanger air inlet of the thin plate tobacco drying machine. The heat exchange module 2 is arranged in the receiving cavity 11. The heat exchange module 2 includes a water inlet pipe 21, a heat exchange pipe 22 and a water outlet pipe 23. The inlet of the heat exchange pipe 22 is communicated with the water inlet pipe 21, and the outlet of the heat exchange pipe 22 is communicated with the water outlet pipe 23. The inlet of the water inlet pipe 21 is communicated with the discharge port of the condensed water recovery system of the thin plate tobacco drying machine, and the outlet of the water outlet pipe 23 is communicated with the outside. It should be noted that a suction fan is arranged inside the hot air heat exchanger air inlet of the thin plate tobacco drying machine. Since the air inlet 12 of the housing 1 of the heat exchanger is directly opposite to the hot air heat exchanger air inlet of the thin plate tobacco drying machine, the suction fan can draw in room temperature air to form room temperature wind. The room temperature wind flows into the receiving cavity 11 from the air inlet 12 of the housing 1, and after heat exchange with the condensed water in the heat exchange pipe 22, it flows into the hot air heat exchanger air inlet of the thin plate tobacco drying machine through the air outlet 13.

[0049] In this embodiment, the air inlet 12 of the housing 1 is arranged directly opposite to the air outlet 13. Thus, when the air outlet 13 is directly opposite to the hot air heat exchanger air inlet of the thin plate tobacco drying machine, the flow path of the room temperature wind from the air inlet 12 of the housing 1 flowing into the receiving cavity 11 and then flowing into the hot air heat exchanger air inlet of the thin plate tobacco drying machine through the air outlet 13 is shortened. Furthermore, it is convenient for the suction fan inside the hot air heat exchanger air inlet of the thin plate tobacco drying machine to draw in more room temperature air to form room temperature wind, so as to increase the flow rate of the room temperature wind and improve the heat exchange efficiency of the heat exchanger.

[0050] The heat exchanger provided in this embodiment arranges the heat exchange module 2 in the receiving cavity 11 of the housing 1, and opens an air inlet 12 and an air outlet 13 on the housing 1, making the air outlet 13 directly opposite to the hot air heat exchanger air inlet of the thin plate tobacco drying machine. The inlet of the heat exchange pipe 22 is communicated with the water inlet pipe 21, the outlet of the heat exchange pipe 22 is communicated with the water outlet pipe 23, the inlet of the water inlet pipe 21 is communicated with the discharge port of the condensed water recovery system of the thin plate tobacco drying machine, and the outlet of the water outlet pipe 23 is communicated with the outside. Thus, the condensed water discharged by the thin plate tobacco drying machine can flow into the heat exchange pipe 22 from the water inlet pipe 21, exchange heat with the room temperature wind in the receiving cavity 11 of the housing 1 of the heat exchanger to heat the room temperature wind, and flow out to the outside through the water outlet pipe 23. Furthermore, the heat of the condensed water discharged by the thin plate tobacco drying machine is recovered. The room temperature wind can flow into the receiving cavity 11 from the air inlet 12 of the housing 1, and after heat exchange with the condensed water in the heat exchange pipe 22, it flows into the hot air heat exchanger air inlet of the thin plate tobacco drying machine through the air outlet 13, thereby providing hot air for the thin plate tobacco drying machine, reducing the amount of steam prepared for drying the tobacco leaves by the thin plate tobacco drying machine, and further reducing the drying cost of the tobacco leaves.

[0051] As Figure 2 shown in combination with Figure 1 Figure, the heat exchanger further includes a filter screen 5. The filter screen 5 is detachably installed on the housing 1 and is used to shield the air inlet 12. Thus, when the room-temperature air flows into the accommodation chamber 11 from the air inlet 12 of the housing 1, the particulate matter contained in the room-temperature air can be filtered, preventing the particulate matter from entering the hot air inlet of the hot air heat exchanger of the thin-sheet cut tobacco drier with the room-temperature air and polluting the hot air for drying the cut tobacco. Specifically, the detachable connection manner between the filter screen 5 and the housing 1 is not limited herein and can be pivot connection, threaded connection or snap connection, as long as the filter screen 5 is detachably installed on the housing 1 and shields the air inlet 12 and can filter the particulate matter contained in the room-temperature air.

[0052] In this embodiment, one end of the filter screen 5 is pivotally connected to the housing 1. The two filter screens 5 are respectively arranged on two side walls corresponding to the air inlet 12. The two filter screens 5 can form a pair of opening doors. When the heat exchanger is used to recover the heat of the condensed water discharged by the thin-sheet cut tobacco drier, the filter screen 5 shields the air inlet 12 and filters the particulate matter contained in the room-temperature air. When the heat exchanger fails, the filter screen 5 can be opened to repair the heat exchange module 2 arranged in the housing 1.

[0053] As Figure 3 shown in Figure, the heat exchange module 2 includes at least two heat exchange tubes 22. The at least two heat exchange tubes 22 are arranged at intervals, so that more condensate water can be conveyed by the heat exchange tubes 22 at the same time, improving the heat exchange efficiency between the condensate water in the heat exchange tubes 22 and the room-temperature air in the accommodation chamber 11. It should be noted that the number of heat exchange tubes 22 of the heat exchange module 2 can be 2, 5, 10, 20, 50 or even more. The more the number of heat exchange tubes 22 of the heat exchange module 2, the higher the heat exchange efficiency between the condensate water in the heat exchange tubes 22 and the room-temperature air in the accommodation chamber 11. Those skilled in the art can reasonably set it according to the actual heat exchange efficiency requirements of the heat exchanger.

[0054] In this embodiment, the heat exchange module 2 includes 50 heat exchange tubes 22. The 50 heat exchange tubes 22 are arranged at intervals in the vertical direction, so that the condensate water in the water inlet pipe 21 can flow into the 50 heat exchange tubes 22 at the same time, thus increasing the volume of the condensate water that exchanges heat with the room-temperature air in the accommodation chamber 11, and further improving the heat exchange efficiency between the condensate water in the heat exchange tubes 22 and the room-temperature air in the accommodation chamber 11.

[0055] Continuing as Figure 3As shown in the figure, the heat exchange tube 22 has N water pipes 221 (N≥2). The outlet of the (N - 1)th water pipe 221 is communicated with the inlet of the Nth water pipe 221. The N water pipes 221 are arranged in parallel. The inlet of the first water pipe 221 serves as the inlet of the heat exchange tube 22, and the outlet of the Nth water pipe 221 serves as the outlet of the heat exchange tube 22, thereby extending the flow path of the condensed water in the accommodation cavity 11 and further improving the heat exchange efficiency between the condensed water in the heat exchange tube 22 and the room-temperature air in the accommodation cavity 11. It should be noted that the number of water pipes 221 of the heat exchange tube 22 in this embodiment can be 2, 3, 4, 10, or even more. Those skilled in the art can reasonably set it according to the actual heat exchange efficiency requirements of the heat exchanger.

[0056] In this embodiment, the heat exchange tube 22 has two water pipes 221. The outlet of the first water pipe 221 is communicated with the inlet of the second water pipe 221. The two water pipes 221 are arranged in parallel. The inlet of the first water pipe 221 serves as the inlet of the heat exchange tube 22, and the outlet of the second water pipe 221 serves as the outlet of the heat exchange tube 22. By extending the flow path of the condensed water in the accommodation cavity 11, the heat exchange efficiency between the condensed water in the heat exchange tube 22 and the room-temperature air in the accommodation cavity 11 is improved.

[0057] The heat of the condensed water in the water pipe 221 is transferred to the water pipe 221, and then the room-temperature air in the accommodation cavity 11 is heated to complete the heat exchange between the condensed water in the heat exchange tube 22 and the room-temperature air in the accommodation cavity 11. Therefore, increasing the contact area between the water pipe 221 and the room-temperature air is beneficial to improving the heat exchange efficiency between the condensed water in the heat exchange tube 22 and the room-temperature air in the accommodation cavity 11. Therefore, as Figure 3 Combined with Figure 1 As shown in the figure, the heat exchange module 2 further includes a heat dissipation member 24. The heat dissipation member 24 is fixedly connected to the housing 1 and is located in the accommodation cavity 11. A through hole facing the water pipe 221 is formed in the heat dissipation member 24. The water pipe 221 passes through the through hole and contacts the heat dissipation member 24, so that after the heat of the condensed water in the water pipe 221 is transferred to the water pipe 221, it is transferred to the heat dissipation member 24, thereby correspondingly increasing the contact area between the water pipe 221 and the room-temperature air in the accommodation cavity 11 and improving the heat exchange efficiency between the condensed water in the heat exchange tube 22 and the room-temperature air in the accommodation cavity 11.

[0058] Specifically, the heat dissipation component 24 can be a heat sink or a heat dissipation block. A first connection hole is formed on the housing 1, and a first fixing hole is formed on the heat dissipation component 24. The first locking component passes through the first connection hole and is connected in cooperation with the first fixing hole, so as to fixedly connect the heat dissipation component 24 to the housing 1. In this embodiment, the heat dissipation component 24 is a heat sink. A through hole facing the water delivery pipe 221 is formed on the plate surface of the heat sink. The first connection hole is a through hole, the first fixing hole is a threaded hole, and the first locking component is a bolt. The bolt passes through the through hole and is threadedly connected with the threaded hole, so as to fixedly connect the heat sink to the housing 1.

[0059] Preferably, the heat exchange module 2 includes at least two heat dissipation components 24. The at least two heat dissipation components 24 are arranged at intervals along the length direction of the water delivery pipe 221, so as to further correspondingly increase the contact area between the water delivery pipe 221 and the room temperature air in the accommodation cavity 11, and further improve the heat exchange efficiency between the condensed water in the heat exchange pipe 22 and the room temperature air in the accommodation cavity 11. It should be noted that the number of the heat dissipation components 24 included in the heat exchange module 2 can be 2, 3, 4, 10, 50, or even more. Those skilled in the art can reasonably set it according to the actual heat exchange efficiency requirements of the heat exchanger.

[0060] In this embodiment, the heat exchange module 2 includes at least 50 heat dissipation components 24. The 50 heat dissipation components 24 are arranged at intervals along the length direction of the water delivery pipe 221, so as to further correspondingly increase the contact area between the water delivery pipe 221 and the room temperature air in the accommodation cavity 11, and further improve the heat exchange efficiency between the condensed water in the heat exchange pipe 22 and the room temperature air in the accommodation cavity 11.

[0061] When the thin plate tobacco dryer is in the preheating, production, shutdown, and cooling working stages, the amount of condensed water generated is not the same. When the thin plate tobacco dryer is cooled and shut down, the thin plate tobacco dryer stops discharging condensed water. At the same time, condensed water will remain in the water inlet pipe 21, the heat exchange pipe 22, and the water outlet pipe 23 of the heat exchange module 2 of the heat exchanger. When the thin plate tobacco dryer is restarted and condensed water is discharged into the water inlet pipe 21 of the heat exchanger, the condensed water remaining in the water inlet pipe 21, the heat exchange pipe 22, and the water outlet pipe 23 will have a water hammer phenomenon due to the sudden change in flow velocity, causing violent pressure fluctuations and damaging the pipeline system. Therefore, to solve the above technical problems, Figure 4 The structural schematic diagram of the condensed water inlet and outlet assembly 3 provided in this embodiment is shown. As Figure 4 Combined with Figure 1As shown in the figure, the heat exchanger provided in this embodiment further includes a condensate inlet and outlet assembly 3. The condensate inlet and outlet assembly 3 includes a drain pipe 31, a condensate inlet pipe 32, a condensate outlet pipe 33, and a first valve 34. The drain pipe 31 is arranged in the vertical direction. The inlet of the drain pipe 31 is communicated with the discharge port of the condensate recovery system of the thin plate tobacco drying machine, and the outlet of the drain pipe 31 is communicated with the outside. The inlet of the condensate inlet pipe 32 is communicated with the drain pipe 31, and the outlet of the condensate inlet pipe 32 is communicated with the inlet of the water inlet pipe 21. The outlet of the condensate outlet pipe 33 is communicated with the drain pipe 31, and the inlet of the condensate outlet pipe 33 is communicated with the outlet of the water outlet pipe 23. The condensate inlet pipe 32 and the condensate outlet pipe 33 are arranged at intervals in the vertical direction. The first valve 34 is arranged on the drain pipe 31 and is located between the connection of the condensate inlet pipe 32 and the drain pipe 31 and the connection of the condensate outlet pipe 33 and the drain pipe 31. Thus, before starting the heat exchanger when using the thin plate tobacco drying machine to dry tobacco, the first valve 34 can be opened, so that the condensate retained in the drain pipe 31, the condensate inlet pipe 32, the condensate outlet pipe 33, the water inlet pipe 21, the heat exchange pipe 22, and the water outlet pipe 23 is discharged to the outside from the outlet end of the drain pipe 31 under the influence of gravity, preventing the condensate retained in the drain pipe 31, the condensate inlet pipe 32, the condensate outlet pipe 33, the water inlet pipe 21, the heat exchange pipe 22, and the water outlet pipe 23 from generating a water hammer phenomenon due to a sudden change in flow velocity when condensate is introduced into the heat exchange module 2 of the heat exchanger, thereby protecting the pipeline systems of the thin plate tobacco drying machine and the heat exchanger from being damaged due to the water hammer phenomenon.

[0062] Preferably, a floor drain cover plate 37 is coaxially arranged at one end of the outlet of the drain pipe 31. Thus, when the condensate is discharged from one end of the outlet of the drain pipe 31 to the outside, it is blocked by the floor drain cover plate 37 and will not splash onto the staff working near the thin plate tobacco drying machine.

[0063] Continue as Figure 4 Combined with Figure 1 As shown in the figure, the condensate inlet and outlet assembly 3 further includes a first flow valve 35. The first flow valve 35 is arranged on the condensate inlet pipe 32, so that the flow rate of the condensate flowing from the condensate inlet pipe 32 into the water inlet pipe 21 can be controlled by adjusting the first flow valve 35, and thus the heat exchange efficiency between the condensate in the heat exchange pipe 22 and the room temperature air in the accommodation chamber 11 can be adjusted. Similarly, the condensate inlet and outlet assembly 3 further includes a second flow valve 36. The second flow valve 36 is arranged on the condensate outlet pipe 33, so that the flow rate of the condensate flowing from the water outlet pipe 23 into the condensate outlet pipe 33 can be controlled by adjusting the second flow valve 36, and thus the heat exchange efficiency between the condensate in the heat exchange pipe 22 and the room temperature air in the accommodation chamber 11 can be adjusted.

[0064] After the heat exchanger has been used for a long time to recover the heat of the condensate discharged by the thin plate dryer, it is inevitable that the inlet pipe 21, the heat exchange pipe 22, and the outlet pipe 23 of the heat exchange module 2 will leak, resulting in a reduction in the heat exchange efficiency between the condensate in the heat exchange pipe 22 and the room temperature air in the accommodation chamber 11. It is difficult for the staff to detect the reduction in the heat exchange efficiency between the condensate in the heat exchange pipe 22 and the room temperature air in the accommodation chamber 11. To solve the above technical problems, as shown in the figure, the condensate inlet and outlet assembly 3 further includes a first temperature measuring element 38 and a second temperature measuring element 39. The first temperature measuring element 38 is arranged on the condensate inlet pipe 32 to detect the temperature of the condensate in the condensate inlet pipe 32. The second temperature measuring element 39 is arranged on the condensate outlet pipe 33 to detect the temperature of the condensate in the condensate outlet pipe 33. Thus, by detecting the temperature of the condensate in the condensate inlet pipe 32 and the temperature of the condensate in the condensate outlet pipe 33, the difference between the detection results of the first temperature measuring element 38 and the second temperature measuring element 39 can be calculated, and whether the difference changes continuously can be monitored to determine whether there is a pipeline leakage fault in the heat exchange module 2 of the heat exchanger. When the difference between the temperature of the condensate in the condensate inlet pipe 32 and the temperature of the condensate in the condensate outlet pipe 33 becomes smaller, it can be considered that there is a fault in the heat exchange module 2 of the heat exchanger, resulting in a reduction in the heat exchange efficiency between the condensate in the heat exchange pipe 22 and the room temperature air in the accommodation chamber 11, and the staff needs to repair the heat exchanger, thereby improving the operation reliability of the heat exchanger.

[0065] Preferably, the heat exchanger further includes a runner 4. The rotating shaft of the runner 4 is rotatably connected to the housing 1. The outlet of the condensate inlet pipe 32 is connected to the inlet of the inlet pipe 21 through a water delivery hose, and the inlet of the condensate outlet pipe 33 is communicated with the outlet of the outlet pipe 23 through a water delivery hose. Thus, when there are large fluctuations in the steam condensate discharge of the thin plate dryer, causing the inlet air temperature of the hot air heat exchanger of the thin plate dryer to be unstable after the room temperature air exchanges heat with the condensate in the heat exchange pipe 22 in the accommodation chamber 11, and further resulting in unstable control of the hot air temperature of the thin plate dryer, the staff can push the heat exchanger so that the air outlet 13 of the housing 1 of the heat exchanger no longer faces the hot air heat exchanger inlet of the thin plate dryer, stop supplying hot air to the thin plate dryer. After the condensate discharge of the thin plate dryer returns to normal, the staff can push the heat exchanger so that the air outlet 13 of the housing 1 faces the hot air heat exchanger inlet of the thin plate dryer again and continue to supply hot air to the thin plate dryer. Specifically, the runner 4 can be a caster or a wheel, etc., as long as its rotating shaft can be rotatably installed on the housing 1 of the heat exchanger, so that the staff can push the heat exchanger.

[0066] In this embodiment, the runner 4 is a movable caster with a brake. Thus, when using the heat exchanger to recover the heat of the condensed water discharged by the thin plate tobacco dryer, the brake can be released to prevent the heat exchanger from moving during the use of the heat exchanger, which may cause the air outlet 13 of the housing 1 of the heat exchanger to no longer face the hot air heat exchanger inlet of the thin plate tobacco dryer. When it is necessary to push the heat exchanger, the brake can be engaged to push the heat exchanger.

[0067] In some embodiments, a through hole is provided at the side wall of the housing 1 corresponding to the air outlet 13, and a third temperature measuring element 6 is fixed at the through hole. The third temperature measuring element 6 can detect the temperature at the air outlet 13, so as to monitor whether the inlet air temperature flowing into the hot air heat exchanger inlet of the thin plate tobacco dryer is stable. When the inlet air temperature is unstable, the staff can push the heat exchanger to make the air outlet 13 of the housing 1 of the heat exchanger no longer face the hot air heat exchanger inlet of the thin plate tobacco dryer, and stop supplying hot air to the thin plate tobacco dryer.

[0068] This embodiment also provides a thin plate tobacco dryer, which includes a heat exchanger, a hot air heat exchanger inlet, and a condensed water discharge port. The hot air heat exchanger inlet of the thin plate tobacco dryer faces the air outlet 13 of the housing 1 of the heat exchanger. The inlet of the water inlet pipe 21 of the heat exchange module 2 of the heat exchanger is communicated with the condensed water discharge port of the thin plate tobacco dryer, so as to recover and reuse the heat of the discharged condensed water and reduce the drying cost of the cut tobacco.

[0069] This embodiment also provides a heat exchange method, in which the condensed water discharged from the condensed water discharge port of the thin plate tobacco dryer enters the heat exchange tube 22 of the heat exchanger and exchanges heat with the room temperature air. The room temperature air after heat exchange flows into the hot air heat exchanger inlet of the thin plate tobacco dryer, so as to recover and reuse the heat of the condensed water discharged by the thin plate tobacco dryer and reduce the drying cost of the cut tobacco.

[0070] Obviously, the above embodiments of the present invention are merely examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments, and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A heat exchanger for recovering the heat contained in the condensed water discharged by a thin-sheet tobacco drying machine, characterized in that, The heat exchanger includes: A housing (1) with a receiving cavity (11) provided therein. An air inlet (12) and an air outlet (13) are respectively formed on the housing (1), and the air inlet (12) and the air outlet (13) are respectively communicated with the receiving cavity (11). The air outlet (13) is directly opposite to the hot air heat exchanger inlet of the thin plate cut tobacco dryer; A heat exchange module (2) disposed in the receiving cavity (11). The heat exchange module (2) includes a water inlet pipe (21), a heat exchange pipe (22), and a water outlet pipe (23). The inlet of the heat exchange pipe (22) is communicated with the water inlet pipe (21), and the outlet of the heat exchange pipe (22) is communicated with the water outlet pipe (23). The inlet of the water inlet pipe (21) is communicated with the discharge port of the condensate recovery system of the thin plate cut tobacco dryer, and the outlet of the water outlet pipe (23) is communicated with the outside.

2. The heat exchanger according to claim 1, wherein, The heat exchange module (2) includes at least two of the heat exchange pipes (22), and the at least two heat exchange pipes (22) are arranged at intervals.

3. The heat exchanger according to claim 2, characterized in that, The heat exchange pipe (22) has N water delivery pipes (221). The outlet of the (N - 1)th water delivery pipe (221) is communicated with the inlet of the Nth water delivery pipe (221). The N water delivery pipes (221) are arranged in parallel. The inlet of the first water delivery pipe (221) serves as the inlet of the heat exchange pipe (22), and the outlet of the Nth water delivery pipe (221) serves as the outlet of the heat exchange pipe (22).

4. The heat exchanger according to claim 3, characterized in that, The heat exchange module (2) further includes a heat dissipation member (24). The heat dissipation member (24) is fixedly connected to the housing (1) and is located in the receiving cavity (11). A perforation is formed on the heat dissipation member (24) directly opposite to the water delivery pipe (221), and the water delivery pipe (221) passes through the perforation and contacts the heat dissipation member (24).

5. The heat exchanger according to claim 4, characterized in that, The heat exchange module (2) includes at least two of the heat dissipation members (24), and the at least two heat dissipation members (24) are arranged at intervals along the length direction of the water delivery pipe (221).

6. The heat exchanger according to claim 1, characterized in that, The heat exchanger further includes a condensate inlet and outlet assembly (3), and the condensate inlet and outlet assembly (3) includes: A drain pipe (31) arranged in the vertical direction. The inlet of the drain pipe (31) is communicated with the discharge port of the condensate recovery system of the thin plate cut tobacco dryer, and the outlet of the drain pipe (31) is communicated with the outside; A condensate inlet pipe (32) with its inlet communicated with the drain pipe (31) and its outlet communicated with the inlet of the water inlet pipe (21); A condensate outlet pipe (33) with its outlet communicated with the drain pipe (31) and its inlet communicated with the outlet of the water outlet pipe (23). The condensate inlet pipe (32) and the condensate outlet pipe (33) are arranged at intervals in the vertical direction; A first valve (34) is provided on the drain pipe (31) and is located between the connection of the condensate inlet pipe (32) and the drain pipe (31) and the connection of the condensate outlet pipe (33) and the drain pipe (31).

7. The heat exchanger according to claim 6, characterized in that, A first flow valve (35) is provided on the condensate inlet pipe (32) and / or a second flow valve (36) is provided on the condensate outlet pipe (33).

8. The heat exchanger according to claim 6, characterized in that, A floor drain cover plate (37) is coaxially provided at the outlet end of the drain pipe (31).

9. The heat exchanger according to claim 6, characterized in that A first temperature measuring element (38) is provided on the condensate inlet pipe (32), and a second temperature measuring element (39) is provided on the condensate outlet pipe (33).

10. The heat exchanger according to claim 9, characterized in that, The heat exchanger further includes a runner (4). The rotating shaft of the runner (4) is rotatably connected to the housing (1). The outlet of the condensate inlet pipe (32) is connected to the inlet of the water inlet pipe (21) through a water delivery hose, and the inlet of the condensate outlet pipe (33) is communicated with the outlet of the water outlet pipe (23) through a water delivery hose.

11. The heat exchanger according to any one of claims 1-10, characterized in that, The heat exchanger further includes a filter screen (5). The filter screen (5) is detachably installed on the housing (1) and is used to shield the air inlet (12).

12. The heat exchanger according to any one of claims 1-10, characterized in that, A through hole is formed in the side wall of the housing (1) corresponding to the air outlet (13), and a third temperature measuring element (6) is fixed at the through hole. The third temperature measuring element (6) can detect the temperature at the air outlet (13).

13. A thin-sheet tobacco dryer, characterized in that, It includes the heat exchanger according to any one of claims 1-12. The air inlet of the hot air heat exchanger of the thin plate tobacco drying machine faces the air outlet (13), and the inlet of the water inlet pipe (21) is communicated with the condensate discharge port of the thin plate tobacco drying machine.

14. A heat exchange method is applied to the thin plate cut tobacco dryer as described in claim 13, characterized in that, The condensate discharged from the condensate discharge port of the thin plate tobacco drying machine exchanges heat with the room temperature air, and the room temperature air after heat exchange flows into the air inlet of the hot air heat exchanger of the thin plate tobacco drying machine.

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