Sewage waste heat recovery device of sheet baking machine

Abstract

The utility model discloses a sewage waste heat recovery device for a sheet baking machine, which comprises a plurality of groups of water tanks, the plurality of groups of water tanks are jointly connected with a filter through pipelines, and pipeline pumps are arranged on the pipelines between the water tanks and the filter; the two groups of heat exchangers are connected with the filter and are used for realizing heat exchange between sewage and soft water; the switching mechanism is installed on the multiple sets of heat exchangers and used for switching the two sets of heat exchangers to conduct heat exchange work, a filter screen is arranged at the top of the water tank, and an overflow hole is further formed in the side face of the water tank and connected to a drainage ditch through a pipeline. According to the waste heat recycling device, waste heat can be efficiently recycled, energy consumption and cost are reduced, environmental thermal pollution caused by sewage waste heat emission is avoided, the policy of energy conservation and emission reduction is met, and meanwhile the performance and stability of equipment are improved through reliable water treatment, convenient maintenance design, accurate temperature monitoring and flexible pipeline control.

Description

Technical Field

[0001] This utility model relates to the field of recycling device technology, and in particular to a waste heat recovery device for wastewater from a wafer baking machine. Background Technology

[0002] During the tobacco re-drying process, the large amount of wastewater generated by the drying machine carries a considerable amount of residual heat. Traditional methods for treating this wastewater and residual heat in the tobacco re-drying process are rather crude, typically involving direct discharge of the wastewater. This not only results in a significant waste of thermal energy but also puts considerable pressure on enterprises in terms of energy consumption.

[0003] Currently, most re-drying enterprises have not paid sufficient attention to the recovery and utilization of waste heat from wastewater, or the recovery technologies they use are relatively outdated. On the one hand, unused waste heat increases environmental thermal pollution as it is discharged with wastewater; on the other hand, enterprises need to consume more additional energy to meet other heating needs in the production process, leading to increased production costs. Furthermore, against the backdrop of advocating energy conservation, emission reduction, and green development, this waste of waste heat resources runs counter to national policy guidance. Utility Model Content

[0004] The main purpose of this utility model is to provide a waste heat recovery device for tobacco leaf drying machine, so as to solve the problems in the existing technology of traditional extensive waste heat treatment in tobacco leaf re-drying production, which directly discharges wastewater, resulting in heat energy waste and high energy consumption. Most enterprises do not pay enough attention to and have insufficient recovery technology, which increases environmental heat pollution and production costs.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A waste heat recovery device for a wafer roasting machine includes multiple water tanks, all connected to a filter via pipelines, with a pipeline pump installed on the pipeline between the water tanks and the filter; two heat exchangers connected to the filter for heat exchange between wastewater and soft water; and a switching mechanism installed on the heat exchangers for switching between the two heat exchangers for heat exchange operation.

[0007] As a further improvement of this utility model, a filter screen is provided on the top of the water tank, and an overflow hole is also provided on the side of the water tank. The overflow hole is connected to the drainage ditch through a pipeline.

[0008] As a further improvement of this utility model, the heat exchanger is provided with two sets of inlet pipes at the inlet position. The two sets of inlet pipes are for sewage inlet and soft water inlet, respectively. One end of each inlet pipe is connected to a connecting pipe, and the two ends of the connecting pipe are respectively connected to the inlets of the two sets of heat exchangers.

[0009] As a further improvement of this utility model, the outlet of the heat exchanger is connected to a synchronization pipe, and the two sets of synchronization pipes for discharging sewage and the two sets of synchronization pipes for discharging soft water are respectively connected to a drain pipe. A fixing frame is provided on the outside of the connecting pipe and the synchronization pipe.

[0010] As a further improvement of this utility model, the switching mechanism includes a fixed cylinder for connecting the water inlet pipe and the connecting pipe. The water inlet pipe and the connecting pipe are both connected to the fixed cylinder. A movable plug is slidably connected in the fixed cylinder. Both ends of the movable plug are provided with sealing plugs. The sealing plugs correspond to the positions of the connecting pipes. Grooves are provided at both ends of the movable plug near the water inlet pipe.

[0011] As a further improvement of this utility model, a moving rod is fixedly connected to the moving plug, and a moving block is fixedly connected to one end of the two sets of moving rods that pass through the fixed cylinder. Multiple sets of limiting sleeves are fixedly connected to the moving block, and a limiting rod is slidably connected to the limiting sleeve. A first fixing piece is fixedly connected to both ends of the limiting rod, and a fixing plate is fixedly connected to one end of the multiple sets of first fixing pieces. Both sets of fixed cylinders are fixedly disposed on the side of the fixing plate, and two sets of sliding holes are opened on the fixing plate. Both sets of moving rods are slidably connected to the sliding hole positions.

[0012] As a further improvement of this utility model, a threaded sleeve is fixedly connected to the movable block, and a threaded rod is threadedly connected to the threaded sleeve. Two sets of second fixing plates are rotatably connected to the threaded rod. The second fixing plates are fixedly connected to the side of the fixing plate, and a handle is fixedly connected to one end of the second fixing plate.

[0013] As a further improvement of this utility model, a thermometer is installed on the drain pipe used for discharging soft water.

[0014] As a further improvement of this utility model, a control component for controlling the on / off state of a pipeline is provided. The control component includes a first gate valve installed at the input end of the pipeline pump, a branch pipeline extending to a drainage ditch connected between the pipeline pump and the filter, and a first shut-off valve installed on the branch pipeline, a second shut-off valve installed at the input end of the filter, and a second gate valve installed on the pipeline on the side of the thermometer away from the heat exchanger.

[0015] As a further improvement of this utility model, it also includes a control module, wherein a level gauge is provided in the water tank, and both the pipeline pump and the level gauge are electrically connected to the control module.

[0016] This invention utilizes a heat exchanger to achieve heat exchange between wastewater and soft water, transferring the wastewater's residual heat to the soft water, thus raising the soft water's temperature. This achieves effective waste heat recovery and utilization, improves energy efficiency, reduces energy loss, and achieves energy conservation and emission reduction goals, thereby lowering enterprise energy costs. The wastewater undergoes two-stage filtration through a filter screen and filter at the top of the water tank, effectively removing larger and residual impurities, ensuring the cleanliness of the wastewater entering the heat exchanger, preventing impurities from clogging or damaging the heat exchanger, extending equipment lifespan, and guaranteeing heat exchange efficiency. The switching mechanism allows for convenient switching between the two heat exchangers. When maintenance is required on a particular heat exchanger, simply turning the handle facilitates switching, enabling the disassembly, cleaning, and replacement of inactive heat exchangers, ensuring the continuous and stable operation of the device, and reducing production downtime due to equipment maintenance. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the waste heat recovery device for the chip baking machine of this utility model;

[0018] Figure 2 This is a schematic diagram of the heat exchanger structure;

[0019] Figure 3 for Figure 2 A schematic diagram of the cross-sectional structure;

[0020] Figure 4 for Figure 2 Enlarged view of point A in the middle;

[0021] Labeling explanation: 1. Water tank; 11. Filter screen; 12. Overflow hole;

[0022] 2. Filter; 3. Pipeline pump;

[0023] 4. Heat exchanger; 41. Inlet pipe; 42. Connecting pipe; 43. Synchronization pipe; 44. Drain pipe; 45. Mounting bracket;

[0024] 5. Switching mechanism; 51. Fixed cylinder; 52. Moving plug; 53. Sealing plug; 54. Moving rod; 55. Moving block; 56. Limiting sleeve; 57. Limiting rod; 58. First fixing plate; 59. Fixing plate; 510. Sliding hole; 511. Threaded sleeve; 512. Threaded rod; 513. Second fixing plate; 514. Handle;

[0025] 6. Thermometer;

[0026] 7. Control components; 71. First gate valve; 72. First shut-off valve; 73. Second shut-off valve; 74. Second gate valve. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0028] like Figure 1 As shown, this embodiment provides an example of a waste heat recovery device for a wafer roasting machine. In this embodiment, the recovery device includes two sets of water tanks 1, which are used to temporarily store wastewater. A filter screen 11 is installed on the top of each water tank 1 to filter larger impurities in the wastewater. An overflow hole 12 is also provided on the side of each water tank 1, and the overflow hole 12 is connected to a drainage ditch via a pipeline to prevent excessive accumulation of wastewater in the water tank 1. Multiple sets of water tanks 1 are connected to a filter 2 via pipelines, which is used to further filter impurities in the wastewater. A pipeline pump 3 is installed on the pipeline between the water tanks 1 and the filter 2, and the pipeline pump 3 is used to transport the wastewater.

[0029] Furthermore, the above-mentioned recycling device also includes a control module. A level gauge is installed in the water tank 1. Both the pipeline pump 3 and the level gauge are electrically connected to the control module, which facilitates automatic control of the start and stop of the pipeline pump 3 according to the liquid level in the water tank 1.

[0030] For further details, please refer to Figure 2 and Figure 3 The aforementioned recovery device also includes two sets of heat exchangers 4 connected to the filter 2. The heat exchangers 4 are used to achieve heat exchange between wastewater and soft water. Two sets of inlet pipes 41 are provided at the inlet of each heat exchanger 4, one for wastewater and the other for soft water. One end of each inlet pipe 41 is connected to a connecting pipe 42, and both ends of the connecting pipe 42 are connected to the inlets of the two heat exchangers 4. The inlet pipes 41 and connecting pipes 42 allow both wastewater and soft water to enter the heat exchangers 4. Synchronization pipes 43 are connected to the outlets of the heat exchangers 4. The two sets of synchronization pipes 43 for discharging wastewater and the two sets for discharging soft water are connected to drain pipes 44. The synchronization pipes 43 and drain pipes 44 facilitate the discharge of cooled wastewater and heated soft water. Fixing brackets 45 are provided on the outside of the connecting pipes 42 and the synchronization pipes 43 to fix their positions.

[0031] Specifically, such as Figure 3 and Figure 4As shown, the above-mentioned recovery device includes a switching mechanism 5 installed on multiple sets of heat exchangers 4. The switching mechanism 5 is used to switch between two sets of heat exchangers 4 for heat exchange. The switching mechanism 5 includes a fixed cylinder 51 for connecting the inlet pipe 41 and the connecting pipe 42. Both the inlet pipe 41 and the connecting pipe 42 are connected to the fixed cylinder 51. A movable plug 52 is slidably connected in the fixed cylinder 51. Both ends of the movable plug 52 are provided with sealing plugs 53. The sealing plugs 53 correspond to the positions of the connecting pipes 42. When the movable plug 52 moves, it drives the sealing plugs 53 to move and block the connection position between the connecting pipes 42 and the fixed cylinder 51, thereby ensuring that only one set of heat exchangers 4 is engaged in heat exchange at any given time. Furthermore, the position of the movable plug 52 can be changed to allow different heat exchangers 4 to operate, which facilitates the disassembly, cleaning, and replacement of a set of heat exchangers 4 that is not in operation, ensuring the continuous operation of the device. Grooves are provided at both ends of the movable plug 52 near the inlet pipe 41. The grooves facilitate the flow of liquid in the inlet pipe 41 into the fixed cylinder 51. A movable rod 54 is fixedly connected to the movable plug 52. When the movable rod 54 moves, it drives the movable plug 52 to move synchronously. Two sets of movable rods 54 pass through one end of the fixed cylinder 51 and are fixedly connected to a movable block 55. When the movable block 55 moves, it drives the movable rods 54 to move synchronously. Multiple sets of limiting sleeves 56 are fixedly connected to the movable block 55. The movable block 55 and the limiting sleeves 56 move synchronously. A limiting rod 57 is slidably connected to the limiting sleeve 56. Both ends of the limiting rod 57 are fixedly connected to a first fixing piece 58. One end of the multiple sets of first fixing pieces 58 is fixedly connected to a fixed plate 59. The positions of the limiting rod 57 and the first fixing pieces 58 are fixed. Together with the limiting sleeves 56, they limit the movement of the movable block 55 to ensure smooth movement. Both sets of fixed cylinders 51 are fixedly installed on the side of the fixed plate 59, and the positions of the fixed cylinders 51 are fixed. Two sets of sliding holes 510 are provided on the fixed plate 59. Both sets of moving rods 54 are slidably connected to the sliding holes 510, facilitating the movement of the moving rods 54. A threaded sleeve 511 is also fixedly connected to the moving block 55. When the threaded sleeve 511 moves, it drives the moving block 55 to move synchronously. A threaded rod 512 is threadedly connected to the threaded sleeve 511. Two sets of second fixing plates 513 are rotatably connected to the threaded rod 512. The second fixing plates 513 are fixedly connected to the side of the fixed plate 59. The threaded rod 512 is kept in its original position and rotated through the second fixing plates 513. When the threaded rod 512 rotates, it drives the threaded sleeve 511 to move along the length of the threaded rod 512. A handle 514 is fixedly connected to one end of the second fixing plate 513. The handle 514 facilitates the rotation of the threaded rod 512.

[0032] Furthermore, the aforementioned recycling device includes a thermometer 6 installed on a drain pipe 44 for discharging soft water, the thermometer 6 being used to monitor the temperature of the discharged soft water.

[0033] Furthermore, the aforementioned recycling device also includes a control component 7 for controlling the on / off state of the pipeline. The control component 7 includes a first gate valve 71 installed at the input end of the pipeline pump 3, which controls whether wastewater flows out of the water tank 1. A branch pipe extending to a drainage ditch is connected between the pipeline pump 3 and the filter 2, and a first shut-off valve 72 is installed on the branch pipe. A second shut-off valve 73 is installed at the input end of the filter 2. The first shut-off valve 72 and the second shut-off valve 73 control the flow direction of the wastewater. A second gate valve 74 is installed on the pipeline on the side of the thermometer 6 away from the heat exchanger 4 to control the discharge of wastewater.

[0034] In this invention, wastewater generated by the wafer baking machine flows into two sets of water tanks 1 for temporary storage. As the wastewater enters the water tanks 1, the top filter screen 11 filters out larger impurities. If too much wastewater accumulates in the water tanks 1, it can be discharged into a drainage ditch through the overflow hole 12 on the side via a pipeline. The liquid level in the water tanks 1 is monitored in real time by a level gauge, which is electrically connected to the control module. When the liquid level reaches a certain height, the control module activates the pipeline pump 3 connected to the pipeline between the water tanks 1 and the filter 2, transporting the wastewater to the filter 2.

[0035] Wastewater is pumped to filter 2 via pipeline pump 3. Filter 2 further filters out residual impurities in the wastewater, making it cleaner and preparing it for subsequent heat exchange. The deeply filtered wastewater flows into heat exchanger 4 through inlet pipe 41 and connecting pipe 42. Simultaneously, soft water also enters heat exchanger 4 through corresponding inlet pipe 41 and connecting pipe 42. Inside heat exchanger 4, wastewater and soft water exchange heat, with the wastewater cooling down and the soft water heating up. The cooled wastewater is discharged through synchronization pipe 43 and drain pipe 44, and the heated soft water is also discharged through synchronization pipe 43 and drain pipe 44.

[0036] When it is necessary to disassemble, clean, or replace a set of heat exchangers 4, the switching mechanism 5 can be operated. Turning the handle 514 causes the threaded rod 512 to rotate under the support of the second fixing plate 513, moving the threaded sleeve 511 threadedly connected to the threaded rod 512. The threaded sleeve 511 drives the moving block 55 to move, and the moving block 55, through the moving rod 54, drives the moving plug 52 to slide within the fixed cylinder 51. The sealing plugs 53 at both ends of the moving plug 52 move accordingly, blocking the connection between the connecting pipe 42 of the currently working heat exchanger 4 and the fixed cylinder 51, thereby switching to another set of heat exchangers 4 for heat exchange, facilitating maintenance of the non-working heat exchangers 4. During this process, the limiting sleeve 56 slides on the limiting rod 57, and the first fixing plates 58 at both ends of the limiting rod 57 cooperate with the fixing plate 59 to limit the movement of the moving block 55, ensuring smooth movement.

[0037] A thermometer 6 is installed on the drain pipe 44 used for discharging soft water to monitor the temperature of the discharged soft water in real time, so that staff can understand the heat exchange effect. The pipeline is controlled by the control component 7. The first gate valve 71 installed at the input end of the pipeline pump 3 controls whether sewage flows out of the water tank 1; the branch pipe extending from the pipeline pump 3 to the drainage ditch is equipped with a first shut-off valve 72, and the input end of the filter 2 is equipped with a second shut-off valve 73, which work together to control the sewage flow direction; the second gate valve 74 on the pipe on the side of the thermometer 6 away from the heat exchanger 4 controls the discharge of sewage.

[0038] The specific embodiments of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications or substitutions to the utility model are also within the scope of the utility model. Therefore, all equivalent transformations, modifications, and improvements made without departing from the spirit and principles of the utility model should be covered within the scope of the utility model.

Claims

1. A waste heat recovery device for a wafer roasting machine, characterized in that, The recycling device includes: Multiple sets of water tanks (1), the multiple sets of water tanks (1) are connected to a filter (2) through pipelines, and a pipeline pump (3) is installed on the pipeline between the water tanks (1) and the filter (2); Two sets of heat exchangers (4) are connected to the filter (2), and the heat exchangers (4) are used to realize heat exchange between sewage and soft water; A switching mechanism (5) is installed on multiple sets of heat exchangers (4) for switching between two sets of heat exchangers (4) for heat exchange.

2. The waste heat recovery device for a wafer roasting machine according to claim 1, characterized in that, The water tank (1) is equipped with a filter screen (11) on the top, and an overflow hole (12) is also provided on the side of the water tank (1). The overflow hole (12) is connected to the drainage ditch through a pipeline.

3. The waste heat recovery device for a wafer roasting machine according to claim 2, characterized in that, The heat exchanger (4) has two sets of inlet pipes (41) at the inlet position. The two sets of inlet pipes (41) are for sewage inlet and soft water inlet, respectively. One end of the inlet pipe (41) is connected to a connecting pipe (42), and the two ends of the connecting pipe (42) are respectively connected to the inlets of the two sets of heat exchangers (4).

4. The waste heat recovery device for a wafer roasting machine according to claim 3, characterized in that, The outlet of the heat exchanger (4) is connected to a synchronization pipe (43). The two sets of synchronization pipes (43) used to discharge sewage and the two sets of synchronization pipes (43) used to discharge soft water are connected to a drain pipe (44). A fixing frame (45) is provided on the outside of the connecting pipe (42) and the synchronization pipe (43).

5. The waste heat recovery device for a wafer roasting machine according to claim 4, characterized in that, The switching mechanism (5) includes a fixed cylinder (51) for connecting the water inlet pipe (41) and the connecting pipe (42). The water inlet pipe (41) and the connecting pipe (42) are both connected to the fixed cylinder (51). A movable plug (52) is slidably connected in the fixed cylinder (51). Both ends of the movable plug (52) are provided with sealing plugs (53). The sealing plugs (53) correspond to the positions of the connecting pipe (42). The movable plug (52) has grooves at both ends on the side near the water inlet pipe (41).

6. The waste heat recovery device for a wafer roasting machine according to claim 5, characterized in that, The movable plug (52) is fixedly connected to a movable rod (54). Two sets of movable rods (54) pass through one end of the fixed cylinder (51) and are fixedly connected to a movable block (55). Multiple sets of limiting sleeves (56) are fixedly connected to the movable block (55). Limiting rods (57) are slidably connected to the limiting sleeves (56). Both ends of the limiting rods (57) are fixedly connected to first fixing pieces (58). One end of multiple sets of first fixing pieces (58) is fixedly connected to a fixing plate (59). Both sets of fixed cylinders (51) are fixedly set on the side of the fixing plate (59). Two sets of sliding holes (510) are opened on the fixing plate (59). Both sets of movable rods (54) are slidably connected to the sliding holes (510).

7. The waste heat recovery device for a wafer roasting machine according to claim 6, characterized in that, The movable block (55) is also fixedly connected to a threaded sleeve (511), and a threaded rod (512) is threadedly connected to the threaded sleeve (511). Two sets of second fixing plates (513) are rotatably connected to the threaded rod (512). The second fixing plates (513) are fixedly connected to the side of the fixing plate (59), and a handle (514) is fixedly connected to one end of the second fixing plate (513).

8. The waste heat recovery device for a wafer roasting machine according to claim 7, characterized in that, A thermometer (6) is installed on the drain pipe (44) used to discharge soft water.

9. The waste heat recovery device for a wafer roasting machine according to claim 8, characterized in that, A control component (7) for controlling the opening and closing of the pipeline includes a first gate valve (71) installed at the input end of the pipeline pump (3), a branch pipeline extending to the drainage ditch is connected between the pipeline pump (3) and the filter (2), and a first shut-off valve (72) is installed on the branch pipeline, a second shut-off valve (73) is installed at the input end of the filter (2), and a second gate valve (74) is installed on the pipeline on the side of the thermometer (6) away from the heat exchanger (4).

10. The waste heat recovery device for a wafer roasting machine according to claim 9, characterized in that, It also includes a control module. The water tank (1) is equipped with a level gauge. The pipeline pump (3) and the level gauge are both electrically connected to the control module.

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