Waste heat recovery drying equipment

Abstract

The utility model relates to the technical field of drying equipment, in particular to waste heat recovery drying equipment. Waste heat of dried materials can be effectively utilized to heat new materials, and more energy is saved. Comprising a drying box, a plurality of partition plates, a plurality of belt conveyors and an air blower, the drying box is divided into a plurality of cavities from top to bottom through the partition plates, the belt conveyors are installed in the cavities respectively, every two vertically adjacent partition plates are provided with communicating ports arranged in a staggered mode, and the conveying directions of every two vertically adjacent belt conveyors are opposite. A heating assembly is installed in a cavity in the upper portion in the drying box, a feeding channel communicated with the interior of the cavity in the upper portion is formed in the upper portion of the drying box, and a discharging port communicated with the interior of the cavity in the lower portion is formed in the lower portion of the side wall of the drying box. The air blowers are fixedly installed at the discharging ports, and the air outlet ends of the air blowers stretch into the upper portions in the corresponding cavities from the discharging ports.

Description

Technical Field

[0001] This utility model relates to the technical field of drying equipment, and in particular to a waste heat recovery drying equipment. Background Technology

[0002] As is well known, Chinese medicinal herbs need to be dried before being ground into powder, and formed Chinese medicine pills also need to be heated and dried, with belt dryers being the most commonly used method.

[0003] For example, Chinese invention patent CN106123544A discloses a belt dryer for Chinese herbal medicine slices, which includes a base, frame legs at the lower end of the base, pads on the frame legs, and a cavity structure in the middle of the base. The cavity is the dryer cavity, and a horizontal transmission plate is set on the dryer cavity. The horizontal transmission plate is connected to the conveyor belt. A discharge port is connected to one end of the conveyor belt, and a feed port is connected to the other end. Its design structure is compact, the material does not get blocked, the conveying is stable, and the material is evenly distributed.

[0004] However, the above-mentioned device still has the following drawbacks: the dried material is removed from the conveyor belt self-contained dryer at a high temperature, and subsequent cooling is required, resulting in a large waste of heat energy. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a more energy-efficient waste heat recovery drying device that effectively utilizes the residual heat of dried materials to heat new materials.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waste heat recovery drying device, comprising a drying chamber, multiple partition plates, multiple belt conveyors, and a blower. The partition plates divide the drying chamber into multiple chambers from top to bottom. Multiple belt conveyors are respectively installed in the multiple chambers. Each pair of adjacent upper and lower partition plates has staggered connecting ports. The conveying directions of adjacent upper and lower belt conveyors are opposite. The feeding end of the lower set of belt conveyors corresponds to the discharge end of the adjacent upper set of belt conveyors. A heating component is installed in the upper chamber of the drying chamber. The upper part of the drying chamber has a feeding channel communicating with the interior of the upper chamber. The lower side wall of the drying chamber is provided with a discharge port that communicates with the interior of a lower chamber. The blower is fixedly installed at the discharge port, and the air outlet of the blower extends from the discharge port into the upper part of the corresponding chamber. Furthermore, the heating component can be a steam heater or an electric heater. The outer wall of the drying chamber and the partitions are all insulated to reduce heat loss from the inside of the drying chamber and heat transfer between the chambers. The feeding channel is far away from the connection port of the adjacent set of partitions. It should be noted that the air force of the blower should be less than the weight of the material to be dried to avoid blowing the material into the drying chamber and affecting the normal discharge of the material.

[0007] Preferably, the belt conveyor includes two rotating rollers rotatably installed inside the drying chamber, a conveyor belt sleeved on the rollers, and a drive motor installed outside the drying chamber to provide power for the rotation of one of the rollers; the conveyor belt is provided with a plurality of equally spaced through openings; furthermore, the diameter of the through opening is smaller than the external dimensions of the material to be dried, so as to prevent the material to be dried from falling from the through opening.

[0008] Preferably, a plurality of elastic vibration elements are installed in a chamber in the upper part of the drying oven. Each elastic vibration element includes a mounting support and a plurality of elastic rods evenly distributed in rows on the mounting support. Each elastic rod includes a telescopic rod, a first spring sleeved on the extended end of the telescopic rod, a limiting plate fixedly installed on the top of the telescopic rod, and a ball bearing rotatably installed on the limiting plate. The elastic rods are correspondingly arranged with the through-holes on the conveyor belt. Further, the outer diameter of the limiting plate is larger than the inner diameter of the through-hole, and the outer diameter of the ball bearing matches the inner diameter of the through-hole. The limiting plate is used to support the conveyor belt. The fixed end of the telescopic rod is elastically connected to the limiting plate through the first spring, that is, the two ends of the first spring are respectively connected to the fixed end of the telescopic rod and the limiting plate.

[0009] Preferably, it also includes a suction fan installed on the top of the drying chamber, the suction end of the suction fan extending into a set of chambers in the upper part of the drying chamber; further, the connection between the suction end of the suction fan and the upper chamber in the drying chamber is close to the feeding channel; the suction force of the suction fan should be less than the weight of the material to be dried, so as to avoid the material being sucked out of the drying chamber by the suction fan.

[0010] Preferably, the heating assembly includes multiple U-shaped heating elements; further, the multiple U-shaped heating elements are independently controlled by an external PLC control system.

[0011] Preferably, the plurality of the U-shaped heating tubes and the plurality of the elastic oscillating elements are arranged at intervals.

[0012] Preferably, a guide baffle plate is hingedly installed inside the feeding channel, and a second spring is fixedly installed at the bottom of the guide baffle plate. The guide baffle plate is elastically connected to the inner wall of the feeding channel through the second spring.

[0013] Compared with the prior art, this utility model provides a waste heat recovery drying device with the following beneficial effects: The waste heat recovery drying device involves feeding material through a feeding channel into a belt conveyor in the upper chamber of the drying chamber. A heating component heats and dries the material on the belt conveyor. The dried material falls through a connecting port onto the next adjacent belt conveyor. A blower blows external cold air into the drying chamber from a lower chamber, allowing the cold air to contact the dried material. The cold air absorbs the waste heat from the dried material and heats up, while the material cools down. The heat-absorbing cold air then enters the upper chamber of the drying chamber to replenish the heat energy within that chamber. This effectively utilizes the waste heat of the dried material to heat new material, resulting in greater energy savings. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0015] Figure 2 This is a top view schematic diagram of the structure of this utility model;

[0016] Figure 3 This is the utility model Figure 2 Schematic diagram of the cross-sectional structure at point AA;

[0017] Figure 4 This is the utility model Figure 3 Schematic diagram of the cross-sectional structure at point BB;

[0018] Figure 5 This is a three-dimensional structural diagram of the U-shaped electric heating tube of this utility model;

[0019] Figure 6 This is a three-dimensional structural diagram of the elastic vibration initiator of this utility model;

[0020] Figure 7 This is the utility model Figure 3 A magnified schematic diagram of the structure at point C in the middle;

[0021] The following are labels in the attached diagram: 1. Drying oven; 2. Partition plate; 3. Blower; 4. Chamber; 5. Connecting port; 6. Feeding channel; 7. Discharge port; 8. Rotary roller; 9. Conveyor belt; 10. Drive motor; 11. Through port; 12. Mounting support; 13. Telescopic rod; 14. First spring; 15. Limiting plate; 16. Ball bearing; 17. Suction fan; 18. U-shaped electric heating tube; 19. Material guide baffle plate; 20. Second spring. Detailed Implementation

[0022] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0023] As described in the background art, a belt dryer for Chinese herbal medicine slices is used. After drying, the material is removed from the dryer via a conveyor belt. At this time, the temperature of the material is high, and it needs to be cooled down later, resulting in a large waste of heat energy.

[0024] To solve this technical problem, this utility model provides a waste heat recovery drying device, which is applied to the drying treatment of materials.

[0025] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0026] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Example 1

[0027] For details, please refer to Figure 1-3The waste heat recovery drying equipment specifically includes: a drying chamber 1, multiple partition plates 2, multiple belt conveyors, and a blower 3. The partition plates 2 divide the drying chamber 1 into multiple chambers 4 from top to bottom. The multiple belt conveyors are installed in the multiple chambers 4 respectively. Each pair of adjacent partition plates 2 has staggered connecting ports 5. The conveying directions of the two adjacent belt conveyors are opposite. The feeding end of the lower set of belt conveyors corresponds to the discharge end of the adjacent upper set of belt conveyors. A heating component is installed in the upper chamber 4 of the drying chamber 1. The upper part of the drying chamber 1 has a feeding channel 6 that communicates with the interior of the upper chamber 4. The lower part of the side wall of the drying chamber 1 is equipped with... There is a discharge port 7 that communicates with the interior of the lower chamber 4. The blower 3 is fixedly installed at the discharge port 7, and the air outlet of the blower 3 extends from the discharge port 7 into the upper part of the corresponding chamber 4. Furthermore, the heating component can be a steam heater or an electric heater. The outer wall of the drying chamber 1 and the partition plate 2 are all insulated to reduce the heat loss from the inside of the drying chamber 1 to the outside and the heat transfer between the chambers 4. The feeding channel 6 is far away from the connecting port 5 of the adjacent set of partition plates 2. It should be noted that the air force of the blower 3 should be less than the weight of the material to be dried, so as to avoid blowing the material to be dried into the drying chamber 1 and affecting the normal discharge of the material.

[0028] For details, please refer to Figure 1 and Figure 3 It also includes a suction fan 17 installed on the top of the drying chamber 1, with the suction end of the suction fan 17 extending into a set of chambers 4 in the upper part of the drying chamber 1; furthermore, the connection between the suction end of the suction fan 17 and the upper chamber 4 in the drying chamber 1 is close to the feeding channel 6; the suction force of the suction fan 17 should be less than the weight of the material to be dried, so as to avoid the material being sucked out of the drying chamber 1 by the suction fan 17.

[0029] For details, please refer to Figure 3 A guide baffle plate 19 is hingedly installed inside the feeding channel 6. A second spring 20 is fixedly installed at the bottom of the guide baffle plate 19. The guide baffle plate 19 is elastically connected to the inner wall of the feeding channel 6 through the second spring 20.

[0030] The waste heat recovery drying equipment provided in this embodiment can remove water vapor from the upper chamber 4 of the drying chamber 1 using the suction fan 17, thereby reducing the water vapor content in the corresponding chamber 4; and under the suction negative pressure of the suction fan 17 and the airflow blown downward into the lower set of chambers 4 by the blower 3, it can promote the formation of moisture in the drying chamber 1. Figure 3The airflow moves in the opposite direction of the arrow to ensure that the heat of the dried material is replenished in time to the upper set of chambers 4. The guide baffle 19 prevents the material from being concentrated in the feeding channel 6, so that the material falls gradually to the corresponding belt conveyor in a dispersed state. The second spring 20 allows the guide baffle 19 to swing around the hinge point, so that the material can enter the drying box 1 more smoothly. At the same time, under the action of the guide baffle 19, the upward hot airflow in the chamber 4 can be blocked to reduce the hot airflow in the chamber 4 from escaping from the feeding channel 6. Example 2

[0031] The waste heat recovery drying equipment provided in Example 1 has been further optimized. For details, please refer to [link / reference needed]. Figure 1-4 The belt conveyor includes two rotating rollers 8 rotatably installed inside the drying chamber 1, a conveyor belt 9 sleeved on the rollers 8, and a drive motor 10 installed outside the drying chamber 1 to provide power for the rotation of one of the rollers 8; the conveyor belt 9 is provided with a plurality of equally spaced through openings 11; furthermore, the diameter of the through opening 11 is smaller than the external dimensions of the material to be dried, so as to prevent the material to be dried from falling from the through opening 11.

[0032] For details, please refer to Figure 3 and Figures 6-7 Multiple sets of elastic vibration elements are installed in a chamber 4 at the upper part of the drying oven 1. The elastic vibration elements include a mounting support 12 and multiple elastic rods evenly distributed in rows on the mounting support 12. The elastic rods include a telescopic rod 13, a first spring 14 sleeved on the extended end of the telescopic rod 13, a limiting plate 15 fixedly installed on the top of the telescopic rod 13, and a ball bearing 16 rotatably installed on the limiting plate 15. The elastic rods are correspondingly arranged with the through-hole 11 on the conveyor belt 9. Furthermore, the outer diameter of the limiting plate 15 is larger than the inner diameter of the through-hole 11, and the outer diameter of the ball bearing 16 matches the inner diameter of the through-hole 11. The limiting plate 15 is used to support the conveyor belt 9. The fixed end of the telescopic rod 13 is elastically connected to the limiting plate 15 through the first spring 14, that is, the two ends of the first spring 14 are respectively connected to the fixed end of the telescopic rod 13 and the limiting plate 15.

[0033] For details, please refer to Figure 3 and Figure 5 The heating assembly includes multiple U-shaped heating elements 18; furthermore, the multiple U-shaped heating elements 18 are independently controlled by an external PLC control system.

[0034] For details, please refer to Figure 3 or Figure 5 Multiple U-shaped heating tubes 18 and multiple elastic oscillating elements are spaced apart.

[0035] The waste heat recovery drying equipment provided in this embodiment uses a drive motor 10 to rotate one of the rollers 8, which in turn drives a conveyor belt 9 to move. The material passes through the heating component, achieving dynamic heating treatment of the material. The through-hole 11 allows hot air to pass through, enabling the hot air to contact the bottom of the material, improving the uniformity of heating and thus enhancing the drying effect. During the movement of the conveyor belt 9, under the action of the first spring 14, the ball bearings 16 at the top of the telescopic rod 13 frequently disengage or enter through the through-hole 11, causing the conveyor belt 9 to vibrate. Under the action of vibration, the material bounces up and down while being conveyed, which further improves the uniformity of contact between the material and the heat source, thereby enhancing the drying effect. According to the drying temperature requirements of different medicinal materials, a corresponding number of U-shaped electric heating tubes 18 can be activated to adaptively adjust the temperature of the upper chamber 4, preventing the material from being overheated. The U-shaped electric heating tubes 18 and the elastic vibration element are spaced apart to ensure that the material is in full contact with the heat source during the conveying and bouncing process, ensuring temperature uniformity throughout the upper chamber 4.

[0036] The waste heat recovery drying equipment provided by this utility model is used as follows: The material is put into the upper chamber 4 of the drying box 1 through the feeding channel 6. The material falls to the corresponding conveyor belt 9. The drive motor 10 starts. While the material is being transported by the conveyor belt 9, it bounces up and down under the action of the elastic vibrating element. After the material is dried, the dried material falls to the next adjacent belt conveyor through the connecting port 5. The blower 3 blows external cold air into the drying box 1 from the lower chamber 4, so that the cold air comes into contact with the conveyed dried material. The cold air rises in temperature due to absorbing the waste heat of the dried material, while the material is cooled down. The cold air that has absorbed heat enters the upper chamber 4 of the drying box 1 to replenish the heat energy in the chamber 4. The dried and cooled material is discharged from the discharge port 7, completing the drying and cooling treatment of the material.

[0037] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

Claims

1. A waste heat recovery drying device, characterized in that, The equipment includes a drying chamber (1), multiple partition plates (2), multiple belt conveyors, and a blower (3). The partition plates (2) divide the drying chamber (1) into multiple chambers (4) from top to bottom. The multiple belt conveyors are installed in the multiple chambers (4). The upper and lower adjacent partition plates (2) are provided with staggered connecting ports (5). The conveying directions of the upper and lower adjacent belt conveyors are opposite. The feeding end of the lower set of belt conveyors is connected to the discharge end of the adjacent upper set of belt conveyors. The drying chamber (1) is arranged in a corresponding manner. A heating component is installed in the upper chamber (4) of the drying chamber (1). The upper part of the drying chamber (1) is provided with a feeding channel (6) that communicates with the interior of the upper chamber (4). The lower part of the side wall of the drying chamber (1) is provided with a discharge port (7) that communicates with the interior of the lower chamber (4). The blower (3) is fixedly installed at the discharge port (7). The air outlet of the blower (3) extends from the discharge port (7) into the upper part of the corresponding chamber (4).

2. The waste heat recovery drying equipment according to claim 1, characterized in that, The belt conveyor includes two rotating rollers (8) rotatably installed inside the drying chamber (1), a conveyor belt (9) sleeved on the rotating rollers (8), and a drive motor (10) installed outside the drying chamber (1) to provide power for the rotation of one of the rotating rollers (8); the conveyor belt (9) is provided with a plurality of equally spaced through openings (11).

3. The waste heat recovery drying equipment according to claim 2, characterized in that, Multiple sets of elastic vibration starters are installed in a chamber (4) at the upper part of the drying box (1). The elastic vibration starters include a mounting support (12) and multiple elastic rods evenly distributed in rows on the mounting support (12). The elastic rods include a telescopic rod (13), a first spring (14) sleeved on the extended end of the telescopic rod (13), a limiting plate (15) fixedly installed on the top of the telescopic rod (13), and a ball bearing (16) rotatably installed on the limiting plate (15). The elastic rods are correspondingly set with the through-hole (11) on the conveyor belt (9).

4. The waste heat recovery drying equipment according to claim 1, characterized in that, It also includes a suction fan (17) installed on the top of the drying chamber (1), the suction end of which extends into a set of chambers (4) in the upper part of the drying chamber (1).

5. The waste heat recovery drying equipment according to claim 3, characterized in that, The heating assembly includes multiple U-shaped heating tubes (18).

6. The waste heat recovery drying equipment according to claim 5, characterized in that, Multiple U-shaped heating tubes (18) and multiple elastic oscillating elements are spaced apart.

7. The waste heat recovery drying equipment according to claim 1, characterized in that, A guide plate (19) is hingedly installed inside the feeding channel (6). A second spring (20) is fixedly installed at the bottom of the guide plate (19). The guide plate (19) is elastically connected to the inner wall of the feeding channel (6) through the second spring (20).

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