Particle drying oven with waste heat recovery function
By designing inner and outer sleeve heat exchange and closed-loop airflow circulation in the particle drying oven, the problems of waste heat and low heating efficiency are solved, achieving efficient waste heat recovery and energy consumption reduction, and improving drying efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XIUZHENG PHARMACEUTICAL GROUP LINYI XIUZHENG PHARMACEUTICAL CO LTD
- Filing Date
- 2025-08-22
- Publication Date
- 2026-07-07
AI Technical Summary
Existing particle drying ovens suffer from severe waste of high-temperature exhaust heat, low heat conversion efficiency, and high energy consumption. Furthermore, insufficient external air heating efficiency leads to excessively high drying energy consumption.
Design a particle drying box with waste heat recovery function. The waste heat of the exhaust gas is recovered through heat exchange between the inner and outer sleeves, forming a closed-loop airflow circulation, which increases the initial temperature during heating and reduces energy consumption.
It achieves effective recovery of waste heat, shortens drying time, reduces unit drying energy consumption by more than 40%, improves heating speed and temperature uniformity, and reduces energy consumption.
Smart Images
Figure CN224470623U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of particle drying equipment technology, and in particular to a particle drying box with waste heat recovery function. Background Technology
[0002] In the processing and manufacturing of Chinese herbal medicine granules, moisture is removed from the granules through a granule drying oven to ensure that the granules reach a moisture content that meets the requirements for storage, transportation and clinical use, while retaining the effective components and efficacy of the Chinese herbal medicine granules.
[0003] After the hot air inside the granule drying oven exchanges heat with the granules, the high-temperature exhaust gas is directly discharged, resulting in serious waste of residual heat. The heat loss per batch is equivalent to 5-10 kWh. Moreover, the external cold air needs to be directly heated from room temperature (20-30℃) to the target temperature. The heat conversion efficiency of the PTC heating module or electric heating tube is only 70% to 80%, and the unit drying energy consumption reaches 0.8-1.2 kWh / kg, which is too high in energy consumption and too low in thermal efficiency. Summary of the Invention
[0004] This utility model provides a particle drying box with waste heat recovery function. The high-temperature exhaust gas inside the main drying box is discharged outward along the upper air outlet pipe and the inner air outlet pipe. The high-temperature exhaust gas in the inner air outlet pipe and the room temperature air entering in the outer channel form a heat exchange, realize waste heat recovery, increase the air temperature, increase the initial temperature during heating, reduce the energy consumption of heating, and improve the heating efficiency.
[0005] This utility model provides a particle drying box with waste heat recovery function, specifically including: a main drying box, a rear air inlet pipe and a rear double-layer sleeve. The lower part of the main drying box is connected to the lower end of the rear air inlet pipe, and the middle part of the rear air inlet pipe is connected and fixedly connected to the lower end of the rear double-layer sleeve. A PTC heating module is fixedly connected to the lower part of the rear air inlet pipe, and a fan is fixedly connected to the lower part of the rear air inlet pipe inside the PTC heating module. The PTC heating module is used to heat the air entering the rear air inlet pipe. The fan generates airflow and sends the heated air into the main drying box to dry the particles placed on the inner drying tray. The top of the rear air inlet pipe is rotatably connected to the tail shaft of the baffle plate, and the tail shaft of the baffle plate is fixedly connected to the first end of the side connecting rod.
[0006] Furthermore, the front hinge of the main drying chamber is rotatably connected to the front door, and the interior of the main drying chamber is slidably connected to the inner drying tray.
[0007] Furthermore, an outer lifting rod is vertically slidably connected to the outer side of the rear air intake pipe, and the outer lifting rod is fixedly connected to the telescopic rod of the telescopic cylinder, with the telescopic cylinder fixedly connected to the outer side of the rear air intake pipe.
[0008] Furthermore, the lower part of the rear double-layer sleeve and the tail of the wind deflector are rotatably connected, and the wind deflector at the lower part of the rear double-layer sleeve is located above the connection position between the rear double-layer sleeve and the rear air intake pipe.
[0009] Furthermore, the tail end of the upper baffle of the rear air intake pipe is slidably connected to the groove at the upper end of the outer lifting rod, and the side connecting rod of the lower baffle of the rear double-layer sleeve is slidably connected to the groove at the lower end of the outer lifting rod. The baffle can rotate to adjust its position and control the airflow direction. The baffle can close the connection between the inner air outlet pipe and the upper air outlet pipe, and the baffle can close the connection between the rear double-layer sleeve and the rear air intake pipe.
[0010] Furthermore, an inner air outlet pipe is fixed to the upper inner side of the rear double-layer sleeve, the upper part of the inner air outlet pipe is connected and fixed to the upper air outlet pipe, and the lower part of the upper air outlet pipe is connected to the outer side of the rear double-layer sleeve.
[0011] Furthermore, the upper air outlet pipe is fixedly connected to the upper part of the main drying box, and the lower part of the upper air outlet pipe is fixedly connected to the top of the rear air inlet pipe. The rear double-layer sleeve forms a waste heat recovery channel, and the inner air outlet pipe is used to discharge the high-temperature waste gas after drying in the main drying box. During the process of the waste gas flowing through the rear double-layer sleeve, it exchanges heat with the cold air in the rear air inlet pipe.
[0012] This utility model provides a particle drying box with waste heat recovery function, which has the following beneficial effects:
[0013] The high-temperature exhaust gas inside the main drying chamber is discharged outward along the upper and inner air outlet pipes. The inner air outlet pipe, where the high-temperature exhaust gas is located, forms a reverse heat exchange with the ambient temperature air entering from the outer channel, realizing waste heat recovery, increasing the initial temperature during heating, and reducing the energy consumption for heating.
[0014] By connecting the upper air outlet pipe and the rear air inlet pipe, a closed-loop airflow circulation is achieved in the main drying chamber, reducing the loss of hot air, making the temperature field inside the main drying chamber more uniform, increasing the heating speed inside the main drying chamber, and reducing the energy consumption of heating and drying. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings of the embodiments will be briefly described below.
[0016] The accompanying drawings described below are only related to some embodiments of the present invention and are not intended to limit the scope of the present invention.
[0017] In the attached diagram:
[0018] Figure 1 A schematic diagram of the overall structure of this application is shown;
[0019] Figure 2 A schematic diagram of the rear air intake structure of this application is shown;
[0020] Figure 3 A structural schematic diagram of the rear air intake pipe, the rear double-layer sleeve, and the upper air outlet pipe of this application is shown.
[0021] Figure 4 A schematic diagram of the structure of the rear double-layer sleeve and the rear intake pipe in the connected state of this application is shown;
[0022] Figure 5 This diagram shows the structure of the rear double-layer sleeve and the rear intake pipe in a closed state according to this application;
[0023] Figure 6 This invention presents a schematic diagram showing the main drying chamber, rear air intake pipe, and rear double-layer sleeve in their separated states.
[0024] Figure label:
[0025] 1. Main drying oven; 101. Front door; 102. Inner drying tray;
[0026] 2. Rear air intake pipe; 201. PTC heating module; 202. Fan; 203. Wind deflector; 204. Side connecting rod; 205. External lifting rod; 206. Telescopic cylinder;
[0027] 3. Rear double-layer sleeve; 301. Inner air outlet duct; 302. Upper air outlet duct. Detailed Implementation
[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the described embodiments of this utility model without creative effort are within the scope of protection of this utility model.
[0029] Example 1: Please refer to Figures 1 to 6 :
[0030] This utility model proposes a particle drying box with waste heat recovery function, including a main drying box 1, a rear air inlet pipe 2, and a rear double-layer sleeve 3. The lower part of the main drying box 1 is connected to the lower end of the rear air inlet pipe 2, and the middle part of the rear air inlet pipe 2 is connected and fixedly connected to the lower end of the rear double-layer sleeve 3. A PTC heating module 201 is fixedly connected to the lower part of the rear air inlet pipe 2, and a fan 202 is fixedly connected to the inner side of the PTC heating module 201. The PTC heating module 201 is used to heat the air entering the rear air inlet pipe 2. The fan 202 generates airflow and sends the heated air into the main drying box 1 to dry the particles placed on the inner drying tray 102. The top of the rear air inlet pipe 2 is rotatably connected to the tail shaft of the baffle plate 203, and the tail shaft of the baffle plate 203 is fixedly connected to the head end of the side connecting rod 204.
[0031] In this embodiment of the present disclosure, the front door 101 is rotatably connected to the front hinge of the main drying box 1, and the inner drying tray 102 is slidably connected inside the main drying box 1. The inner drying tray 102 is used to place the Chinese medicine granules to be dried.
[0032] In this embodiment of the present disclosure, an outer lifting rod 205 is vertically slidably connected to the outer side of the rear air intake pipe 2. The outer lifting rod 205 and the telescopic rod of the telescopic cylinder 206 are fixedly connected. The telescopic cylinder 206 is fixedly connected to the outer side of the rear air intake pipe 2.
[0033] In this embodiment, the lower part of the rear double-layer sleeve 3 and the tail of the wind deflector 203 are rotatably connected. The wind deflector 203 at the lower part of the rear double-layer sleeve 3 is located above the position where the rear double-layer sleeve 3 and the rear air intake pipe 2 are connected. The rotation of the wind deflector 203 realizes the switching between the connected and closed states of the rear double-layer sleeve 3 and the rear air intake pipe 2.
[0034] In this embodiment, the tail end of the upper baffle plate 203 of the rear air intake pipe 2 and the upper end of the outer lifting rod 205 are slidably connected by a groove. The side connecting rod 204 of the lower baffle plate 203 of the rear double-layer sleeve 3 and the lower end of the outer lifting rod 205 are slidably connected by a groove. The baffle plate 203 can rotate to adjust its position and control the airflow direction. The baffle plate 203 can close the connection between the inner air outlet pipe 301 and the upper air outlet pipe 302. The baffle plate 203 can close the connection between the rear double-layer sleeve 3 and the rear air intake pipe 2, forming a closed-loop airflow circulation of "main drying box 1 - upper air outlet pipe 302 - rear air intake pipe 2 - main drying box 1", reducing the loss of hot air, making the temperature inside the main drying box 1 more uniform, and improving the heating speed inside the main drying box 1.
[0035] In this embodiment, an inner air outlet pipe 301 is fixed to the upper inner side of the rear double-layer sleeve 3. The upper part of the inner air outlet pipe 301 is connected and fixed to the upper air outlet pipe 302. The lower part of the upper air outlet pipe 302 is connected to the outer side of the rear double-layer sleeve 3. The upper air outlet pipe 302 and the connected upper air outlet pipe 302 are used to discharge high-temperature exhaust gas with a temperature of 80-120℃ and high moisture content inside the main drying chamber 1.
[0036] In this embodiment, the upper air outlet duct 302 is fixedly connected to the upper part of the main drying chamber 1, and the lower part of the upper air outlet duct 302 is fixedly connected to the top of the rear air inlet duct 2. The rear double-layer sleeve 3 forms a waste heat recovery channel. The inner air outlet duct 301 is used to discharge the high-temperature waste gas after drying in the main drying chamber 1. During the process of the waste gas flowing through the rear double-layer sleeve 3, it exchanges heat with the cold air in the rear air inlet duct 2 to realize waste heat recovery, increase the initial temperature during heating, and reduce the energy consumption of heating.
[0037] In this second embodiment, based on the first embodiment, the main drying chamber 1 can also be a drying chamber with a conveyor belt in the middle. A ventilation branch pipe is provided above the conveyor belt of the main drying chamber 1 and is connected to the upper air outlet pipe 302. The pipe provided below the conveyor belt of the main drying chamber 1 is connected to the lower end of the rear air inlet pipe 2. It is compatible with the drying chamber equipment using the conveyor belt, and the equipment is selected according to the customer's needs.
[0038] The working principle of this embodiment is as follows: The inner drying tray 102 is used to place the Chinese herbal medicine granules to be dried. The fan 202 introduces the air heated by the PTC heating module 201 into the main drying chamber 1. The high-temperature exhaust gas with a temperature of 80-120℃ and high moisture content inside the main drying chamber 1 is discharged to the outside through the connecting pipe between the upper exhaust pipe 302 and the inner exhaust pipe 301. The inner exhaust pipe 301, where the high-temperature exhaust gas is located, forms a reverse heat exchange with the ambient air (20-30℃) entering from the outer double-layer sleeve 3 and the spacer channel between the inner exhaust pipe 301 and the outer double-layer sleeve 3. The inner exhaust pipe 301 is made of high thermal conductivity stainless steel. With a heat transfer rate ≥15W / (m·K), the waste heat of the exhaust gas is transferred to the outer layer of cold air through the pipe wall, preheating the air entering the rear intake pipe 2 to 50-70℃, thus realizing waste heat recovery. Compared with the traditional direct heating method, the heating time from room temperature to the target temperature of 100-150℃ is shortened by 30% to 40%, the initial temperature during heating is increased, and the energy consumption of heating is reduced. With the adaptive power adjustment of the PTC heating module 201, the PTC heating module 201 dynamically adjusts the output according to the preheated air temperature, reducing the energy consumption per unit drying capacity (kWh / kg) by more than 40%.
[0039] During the initial heating and subsequent heat preservation of the main drying chamber 1, the telescopic cylinder 206 extends to support the upward movement of the outer lifting rod 205. The outer lifting rod 205 drives the baffle plate 203 to rotate via the side connecting rod 204. The baffle plate 203 closes the connection between the inner air outlet pipe 301 and the upper air outlet pipe 302, so that the upper air outlet pipe 302 and the baffle plate 203 change from a closed state to a connected state. The baffle plate 203 at the lower part of the rear double-layer sleeve 3 rotates downward, and the rear double-layer sleeve 3 and the rear air inlet pipe 2... The connecting port is sealed by the baffle plate 203. The connection between the upper air outlet pipe 302 and the rear air inlet pipe 2 realizes the airflow circulation of the main drying chamber 1, forming a closed-loop airflow circulation of "main drying chamber 1 - upper air outlet pipe 302 - rear air inlet pipe 2 - main drying chamber 1", which reduces the loss of hot air, makes the temperature inside the main drying chamber 1 more uniform, increases the heating speed inside the main drying chamber 1, accelerates the evaporation of moisture on the particle surface, shortens the drying cycle by 20% to 25%, and further reduces the energy consumption of heating and drying.
[0040] The following points should be noted in this article:
[0041] 1. The accompanying drawings of the embodiments disclosed herein only involve structures relevant to the embodiments disclosed herein; other structures may refer to general designs.
[0042] 2. Where there is no conflict, the embodiments of this disclosure and the features in the embodiments can be combined with each other to obtain new embodiments.
[0043] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.
Claims
1. A particle drying oven with waste heat recovery function, comprising: The main drying chamber (1), the rear air inlet pipe (2), and the rear double-layer sleeve (3) are characterized in that the lower part of the main drying chamber (1) is connected to the lower end of the rear air inlet pipe (2), the middle part of the rear air inlet pipe (2) is connected to the lower end of the rear double-layer sleeve (3) and fixedly connected, a PTC heating module (201) is fixedly connected to the lower part of the rear air inlet pipe (2), a fan (202) is fixedly connected to the lower part of the rear air inlet pipe (2) inside the PTC heating module (201), the top of the rear air inlet pipe (2) is rotatably connected to the tail shaft of the baffle plate (203), and the tail shaft of the baffle plate (203) is fixedly connected to the head end of the side connecting rod (204).
2. A particle drying oven with waste heat recovery function according to claim 1, characterized in that, The front door (101) is rotatably connected to the front hinge of the main drying box (1), and the inner drying tray (102) is slidably connected inside the main drying box (1).
3. A particle drying oven with waste heat recovery function according to claim 1, characterized in that, An external lifting rod (205) is vertically slidably connected to the outside of the rear air intake pipe (2). The external lifting rod (205) and the telescopic rod of the telescopic cylinder (206) are fixedly connected. The telescopic cylinder (206) is fixedly connected to the outside of the rear air intake pipe (2).
4. A particle drying oven with waste heat recovery function according to claim 3, characterized in that, The lower part of the rear double-layer sleeve (3) and the tail of the wind deflector (203) are rotatably connected, and the wind deflector (203) at the lower part of the rear double-layer sleeve (3) is located above the connection position between the rear double-layer sleeve (3) and the rear air intake pipe (2).
5. A particle drying oven with waste heat recovery function according to claim 4, characterized in that, The tail end of the upper wind deflector (203) of the rear air intake pipe (2) and the upper end of the outer lifting rod (205) are slidably connected by a groove, and the side connecting rod (204) of the lower wind deflector (203) of the rear double-layer sleeve (3) and the lower end of the outer lifting rod (205) are slidably connected by a groove.
6. A particle drying oven with waste heat recovery function according to claim 5, characterized in that, An inner air outlet pipe (301) is fixed on the upper inner side of the rear double-layer sleeve (3). The upper part of the inner air outlet pipe (301) is connected and fixed to the upper air outlet pipe (302). The lower part of the upper air outlet pipe (302) is connected to the outer side of the rear double-layer sleeve (3).
7. A particle drying oven with waste heat recovery function according to claim 6, characterized in that, The upper air outlet pipe (302) is fixedly connected to the upper part of the main drying box (1), and the lower part of the upper air outlet pipe (302) is fixedly connected to the top of the rear air inlet pipe (2).