A drying heat recovery device
The drying heat recovery device, which combines heat pipe phase change heat transfer with tube bundle condensation, solves the problem of heat loss in drying gas, realizes the cascade recovery of sensible and latent heat, and reduces drying costs and energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHONGYI (SUZHOU) ENVIRONMENTAL TECH CO LTD
- Filing Date
- 2025-08-06
- Publication Date
- 2026-06-19
AI Technical Summary
The direct emission of heat carried in the existing drying gas leads to heat loss and increases drying costs. Furthermore, the existing heat recovery devices are based on a single convection heat exchange mode, which makes it difficult to efficiently recover latent heat.
A drying heat recovery device that employs the synergistic effect of heat pipe phase change heat transfer and tube bundle condensation utilizes the phase change material inside the heat pipe to undergo phase change under low pressure. Combined with condensation components and cooling water, it performs cascade heat exchange to recover sensible and latent heat, reduce the dew point of the drying gas, and recycle heat.
It effectively recovers sensible and latent heat from the drying gas, reduces drying operating costs, improves energy utilization, and achieves cascaded recovery and reuse of heat.
Smart Images
Figure CN224382053U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a heat recovery device, and more particularly to a drying heat recovery device applied in the field of drying technology. Background Technology
[0002] Material drying is a process that uses heating to convert water in materials into water vapor and separate them from the materials. During the drying process, drying gas is generated. When the amount of water vapor in the drying gas reaches a certain level, the gas becomes saturated wet steam and no longer has the ability to carry water vapor. This part of the gas needs to be extracted from the drying equipment. This part of the gas carries a lot of heat. If the gas is directly discharged, this part of the heat is also lost. Heat needs to be continuously replenished to the dryer to achieve the thermal balance of material drying, which results in a significant increase in drying costs.
[0003] Chinese Patent Publication No. CN216245709U discloses a heat recovery device for airflow drying of wheat gluten. In this device, during the collision of condensate with the airflow and the first and second baffles, the condensate, due to its greater inertia, falls due to gravity, while the airflow continues to rise. The separated condensate falls downwards or flows downwards along the outer wall of the U-shaped tube, passing through the drainage channels on the baffles. When releasing the condensate accumulated at the bottom of the shell, the valve can be closed in time according to the observed liquid level in the tube to prevent the release of hot airflow from the shell. However, the aforementioned patent relies on shell-and-tube heat exchange (U-shaped tube bundle + baffles), a single convection heat exchange mode, which is difficult to efficiently recover latent heat. Utility Model Content
[0004] The technical problem that this utility model aims to solve in view of the above-mentioned prior art is that the drying gas generated during material drying carries a large amount of heat. Directly releasing this gas will result in the loss of this heat, and the drying chamber needs to compensate the dryer for the heat, which leads to a significant increase in drying costs. Existing heat recovery devices are based on a single convection heat exchange mode, which makes it difficult to efficiently recover latent heat.
[0005] To address the aforementioned problems, this utility model provides a drying heat recovery device, including a heat exchange assembly. A condenser assembly is fixedly connected to the lower end of the heat exchange assembly, and a condensate tank is fixedly connected to the lower end of the condenser assembly. The heat exchange assembly includes a mounting housing, with an air inlet and an air outlet fixedly connected to the upper end of the mounting housing. The air inlet is located to the left of the air outlet. A partition is fixedly connected to the inner cavity of the mounting housing, dividing the housing into two channels: a cooling channel on the left and a heating channel on the right. Multiple heat pipes are fixedly connected to both ends of the partition, with adjacent heat pipes connected. Furthermore, the ends of two adjacent heat pipes that are far apart are fixedly connected to the inner wall of the mounting housing. The condensing assembly includes a condensing housing fixedly connected to the lower end of the mounting housing. A second partition is fixedly connected inside the condensing housing. The upper end of the second partition is fixedly connected to the lower end of the first partition. A tube bundle and a protective shell are fixedly fitted on the outer surface of the condensing housing. The tube bundle is located inside the protective shell. An inlet and an outlet are respectively provided outside the protective shell. The inlet and outlet are fixedly connected through the protective shell and the tube bundle in sequence. The condensate tank includes a water storage shell and a drain outlet fixedly connected to the surface of the water storage shell. The mounting housing, the condensing housing, and the water storage shell are interconnected.
[0006] In the aforementioned drying heat recovery device, by adding phase change material inside the heat pipe, the synergistic effect of phase change heat transfer and tube bundle condensation of the heat pipe effectively realizes the stepwise recovery of sensible heat and latent heat in the drying exhaust gas. This reduces the dew point of the recovered water vapor gas, allowing it to re-adsorb moisture from the material and recirculate into the dryer to dry the material. This enables some of the residual heat to be used again in the dryer, further improving the latent heat recovery effect.
[0007] As a further supplement to this application, the water storage shell is fixedly connected to the lower end of the condenser shell, and the longitudinal section of the water storage shell is rectangular.
[0008] As a further supplement to this application, the water storage shell is fixedly connected to the lower end of the mounting shell and the condensation shell, and the longitudinal section of the water storage shell is triangular.
[0009] As a further addition to this application, the outlet is located above the inlet, and the tube bundle is spiral in shape.
[0010] As a further supplement to this application, the heat pipe is inclinedly arranged inside the mounting housing, and the heat pipe in the cooling channel is located below the heat pipe in the heating channel.
[0011] As a further supplement to this application, both ends of the second partition are fixedly connected with nets, and the ends of the two nets that are far apart are fixedly connected to the inner wall of the condenser shell. The nets are placed at an angle, and the two nets are symmetrically distributed with respect to the second partition.
[0012] In summary, in practical applications, the drying gas enters the cooling channel through the inlet, undergoes primary heat exchange through multiple heat pipes, and then experiences secondary cooling through the cooling water within the tube bundle of the condenser assembly. This allows the gas to come into contact with the condensate in the drying gas and simultaneously recover some of its heat. This heat can be used to heat and cool the dehydrated drying gas, which then regains its ability to carry water vapor. Only a small amount of heat is needed to reach the drying temperature, and the gas is then recirculated into the dryer to dry the material, thus achieving heat balance in the dryer and effectively reducing drying operating costs. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the vertical arrangement structure of the first embodiment of this application;
[0014] Figure 2 This is a three-dimensional structural diagram of the condensation assembly according to the first embodiment of this application;
[0015] Figure 3 This is a schematic diagram of the heat pipe structure according to the first embodiment of this application;
[0016] Figure 4 This is a schematic diagram of the horizontal arrangement structure according to the first embodiment of this application;
[0017] Figure 5 This is a schematic diagram of the vertical arrangement structure of the second embodiment of this application;
[0018] Figure 6 This is a schematic diagram of the barrier structure according to the second embodiment of this application.
[0019] Explanation of the labels in the diagram:
[0020] 1-Heat exchange component, 11-Air inlet, 12-Air outlet, 13-Heat pipe, 14-Baffle 1, 15-Mounting shell, 16-Cooling channel, 17-Heating channel, 2-Condensing component, 21-Water inlet, 22-Water outlet, 23-Tube bundle, 24-Baffle 2, 25-Condensing shell, 26-Protective shell, 3-Condensate tank, 31-Drain outlet, 32-Water storage shell, 4-Barrier. Detailed Implementation
[0021] The two embodiments of this application will be described in detail below with reference to the accompanying drawings.
[0022] First implementation method:
[0023] Figure 1The diagram shows a drying heat recovery device, including a heat exchange component 1. A condenser component 2 is fixedly connected to the lower end of the heat exchange component 1, and a condensate tank 3 is fixedly connected to the lower end of the condenser component 2. The heat exchange component 1 includes a mounting housing 15. An air inlet 11 and an air outlet 12 are fixedly connected to the upper end of the mounting housing 15, with the air inlet 11 located to the left of the air outlet 12. A partition 14 is fixedly connected to the inner cavity of the mounting housing 15, dividing the mounting housing 15 into two channels: a cooling channel 16 on the left and a heating channel 17 on the right. Drying gas enters the mounting housing 15 through the air inlet 11 and then enters the cooling channel 17. Condensation occurs inside the condenser shell 25, then enters the water storage shell 32, bypasses the second partition 24, enters the heating channel 17, and finally exits through the air outlet 12 into the mounting shell 15. The condensate tank 3 includes the water storage shell 32 and a drain outlet 31 fixedly connected to the surface of the water storage shell 32. The stored and recovered condensate is discharged through the drain outlet 31. The mounting shell 15, the condenser shell 25, and the water storage shell 32 are interconnected, effectively ensuring the smooth flow of condensate. The water storage shell 32 is fixedly connected to the lower end of the condenser shell 25. The longitudinal section of the water storage shell 32 is rectangular, which is the vertical installation method of this heat recovery device, saving horizontal placement space.
[0024] Figure 1 and Figure 2 The diagram shows that the condensing assembly 2 includes a condensing shell 25 fixedly connected to the lower end of the mounting shell 15. A second partition 24 is fixedly connected inside the condensing shell 25. The upper end of the second partition 24 is fixedly connected to the lower end of the first partition 14. A tube bundle 23 and a protective shell 26 are fixedly sleeved on the outer surface of the condensing shell 25. The tube bundle 23 is located inside the protective shell 26. An inlet 21 and an outlet 22 are respectively provided outside the protective shell 26. The inlet 21 and the outlet 22 are fixedly connected to the protective shell 26 and the tube bundle 23 in sequence. The outlet 22 is located above the inlet 21. The tube bundle 23 is spiral in shape. The tube bundle 23 formed by the spiral coil has cooling water inside, which increases the heat exchange area. The second partition 24 is connected to the first partition 14 in the heat exchange assembly 1, thereby ensuring the separation of the air path. Cold water enters from the inlet 21, absorbs heat, and is discharged from the outlet 22 at the high water level, forming countercurrent heat exchange.
[0025] Figure 1 and Figure 3As shown: Multiple heat pipes 13 are fixedly connected to both ends of the partition 14. Adjacent heat pipes 13 are connected, and the ends of adjacent heat pipes 13 that are far apart are fixedly connected to the inner wall of the mounting housing 15. The heat pipes 13 are installed at an angle inside the mounting housing 15. The heat pipes 13 in the cooling channel 16 are located below the heat pipes 13 in the heating channel 17. The position of the heat pipes 13 in the cooling channel 16 is lower, which is conducive to the return flow of condensate. The heat pipes 13 are installed at an angle, and two adjacent heat pipes 13 form a single vacuum tube. Under vacuum conditions at room temperature, phase change substances such as water and ammonia are added inside. When hot air passes through the cooling channel 16, the substance inside the heat pipe 13 undergoes a phase change under low pressure, transforming into a gaseous state. It rises into the heat pipe 13 in the heating channel 17, where it exchanges heat with the drying gas, causing the drying gas to heat up. At this time, the substance inside the heat pipe 13 in the heating channel 17 condenses upon encountering the cold gas and flows back into the heat pipe 13 in the cooling channel 16 under gravity. It then encounters heat again in the cooling channel 16 and undergoes another phase change, rising continuously in a cycle of heat exchange. This not only effectively dehydrates the drying gas but also allows it to be reheated, enabling it to be reused and saving energy.
[0026] Figure 4 As shown: the water storage shell 32 is fixedly connected to the lower end of the mounting shell 15 and the condenser shell 25. The longitudinal section of the water storage shell 32 is triangular. This is the horizontal arrangement of this heat recovery device, which is suitable for flat installation scenarios and can be adapted to different installation scenarios. The angle between the horizontal arrangement and the ground arrangement is determined according to the process requirements to ensure that the condensate can flow smoothly into the condensate tank 3 by gravity.
[0027] When using this heat recovery device, drying gas containing saturated water vapor is discharged from the inlet 11 into the cooling channel 16, where it comes into contact with the heat pipe 13. This causes the substances inside the heat pipe 13 to undergo a phase change under low pressure, transforming into a gaseous state. The gas then rises into the heat pipe 13 within the heating channel 17, thus performing a primary heat exchange on the drying gas. The drying gas then enters the condenser shell 25, while cooling water enters the tube bundle 23 through the inlet 21 and exits from the outlet 22 at the top, thus performing a secondary condensation on the drying gas within the condenser shell 25. This removes the water vapor from the drying gas. The drying gas then flows from the water storage shell 32, bypasses the second partition 24, and rises into the heating channel 17. The gas exchanges heat with the material inside heat pipe 13, allowing the drying gas to regain its ability to carry water vapor after heating. With a little external heating, it can reach the drying temperature and then circulate back into the dryer for drying. Meanwhile, the material in heat pipe 13 in heating channel 17 condenses and flows back to heat pipe 13 in cooling channel 16 under gravity, where it undergoes a phase change upon reheating. This continuous circulation and heat exchange effectively achieves the cascade recovery of sensible and latent heat in the drying exhaust gas. This results in a lower dew point for the recovered water vapor gas, which can reabsorb moisture from the material. Compared with existing baffle plate heat recovery devices, this device not only significantly improves energy utilization but also has lower energy consumption, making it more energy-efficient.
[0028] Second implementation method:
[0029] This embodiment adds a barrier net 4 to the first embodiment, while the rest remains the same as the first embodiment.
[0030] Figure 5 and Figure 6 As shown: both ends of the partition 24 are fixedly connected to a mesh 4. The surface of the mesh 4 is coated with a hydrophilic coating. The ends of the two meshes 4 that are far apart are fixedly connected to the inner wall of the condenser shell 25. The meshes 4 are placed at an angle and the two meshes 4 are symmetrically distributed with respect to the partition 24.
[0031] When the drying gas enters the condenser shell 25 for condensation, the baffle 4 can guide the water flow into the water storage shell 32 by tilting at an angle. It can also help intercept the humid airflow, increase the gas-solid contact surface, thereby promoting condensation and effectively improving the condensation effect.
[0032] In light of current practical needs, the above-described embodiments adopted in this application are not limited to these. Any changes made within the scope of knowledge possessed by those skilled in the art without departing from the concept of this application still fall within the protection scope of this utility model.
Claims
1. A drying heat recovery device comprising a heat exchanging assembly (1), characterized in that: The lower end of the heat exchange component (1) is fixedly connected to the condenser component (2), and the lower end of the condenser component (2) is fixedly connected to the condenser tank (3). The heat exchange component (1) includes a mounting shell (15). The upper end of the mounting shell (15) is fixedly connected to an air inlet (11) and an air outlet (12). The air inlet (11) is located to the left of the air outlet (12). The inner cavity of the mounting shell (15) is fixedly connected to a partition (14). The partition (14) divides the mounting shell (15) into two channels. The channel on the left is a cooling channel (16), and the channel on the right is a heating channel (17). Both the left and right ends of the partition (14) are fixedly connected to multiple heat pipes (13). Two adjacent heat pipes (13) are connected to each other, and the ends of two adjacent heat pipes (13) that are far apart are fixedly connected to the inner wall of the mounting shell (15). The condensation assembly (2) includes a condensation housing (25) fixedly connected to the lower end of the mounting housing (15). A second partition (24) is fixedly connected inside the condensation housing (25). The upper end of the second partition (24) is fixedly connected to the lower end of the first partition (14). A tube bundle (23) and a protective shell (26) are fixedly sleeved on the outer surface of the condensation housing (25). The tube bundle (23) is located inside the protective shell (26). An inlet (21) and an outlet (22) are respectively provided outside the protective shell (26). The inlet (21) and the outlet (22) are fixedly inserted through the protective shell (26) and the tube bundle (23) in sequence. The condensate tank (3) includes a water storage shell (32) and a drain outlet (31) fixedly connected to the surface of the water storage shell (32). The mounting shell (15), the condensate shell (25) and the water storage shell (32) are connected to each other.
2. A drying heat recovery device according to claim 1, characterized in that: The water storage shell (32) is fixedly connected to the lower end of the condenser shell (25), and the longitudinal section of the water storage shell (32) is rectangular.
3. A drying heat recovery device according to claim 1, characterized in that: The water storage shell (32) is fixedly connected to the lower end of the mounting shell (15) and the condensation shell (25), and the longitudinal section of the water storage shell (32) is triangular.
4. A drying heat recovery device according to claim 1, characterized in that: The outlet (22) is located above the inlet (21), and the tube bundle (23) is spiral in shape.
5. The drying heat recovery device according to claim 1, characterized in that: The heat pipe (13) is inclinedly arranged inside the mounting housing (15), and the heat pipe (13) in the cooling channel (16) is located below the heat pipe (13) in the heating channel (17).
6. A drying heat recovery device according to claim 1, characterized in that: Both ends of the second partition (24) are fixedly connected to a net (4). The ends of the two nets (4) that are far apart are fixedly connected to the inner wall of the condenser shell (25). The nets (4) are placed at an angle, and the two nets (4) are symmetrically distributed with respect to the second partition (24).