Energy-saving bean vermicelli drying system based on heat pump drying technology

Abstract

The utility model discloses a bean vermicelli energy-saving drying system based on a heat pump drying technology, which relates to the technical field of food processing, and is characterized by comprising a drying chamber, a heat pump, a heat pump, a heat pump and a fan, the heat pump units are installed in the drying chamber and matched with the conveying belt, and an intelligent temperature control module is fixedly connected into each heat pump unit; the heat exchange device is fixedly communicated with one end of an air inlet pipe, the other end of the air inlet pipe is fixedly communicated with the drying chamber, the heat exchange device is fixedly communicated with an exhaust pipe, the exhaust pipe is fixedly communicated with the drying chamber, and the heat exchange device is fixedly communicated with a discharge chimney. The utility model provides an energy-saving vermicelli drying system based on a heat pump drying technology. The energy-saving vermicelli drying system is particularly suitable for an efficient and low-consumption drying process of starch products. Waste heat is recycled through the heat pump technology, temperature is accurately controlled, energy consumption is remarkably reduced, and product quality is improved.

Description

Technical Field

[0001] This utility model relates to the field of food processing technology, and more specifically, to an energy-saving drying system for vermicelli based on heat pump drying technology. Background Technology

[0002] Traditional vermicelli drying processes mainly rely on steam heating combined with induced draft fans, which has the following drawbacks:

[0003] (1) High energy consumption: The consumption of steam and electricity is large, and the cost per ton of energy consumption is 674-808 yuan (as shown in Table 1), with an energy utilization rate of less than 30%.

[0004] Table 1. Current energy consumption and cost per ton for drying vermicelli.

[0005]

[0006] (2) Large heat loss: High-temperature exhaust gas (50℃-95℃) is directly emitted, and the waste heat is not effectively recovered;

[0007] (3) Low temperature control accuracy: Manual adjustment leads to temperature fluctuations (±5℃), and the product moisture content fluctuates between 10.5% and 12.5%, affecting the consistency of quality.

[0008] Table 2. Energy consumption and cost per ton for vermicelli drying using waste heat recovery technology.

[0009]

[0010] While existing waste heat recovery technologies can save 25%-35% of steam (as shown in Table 2), they rely on steam as the primary heat source, limiting their energy-saving potential. Although heat pump drying technology is used in some fields, a practical solution for drying vermicelli has not yet been developed. Therefore, a simple, energy-efficient, and highly effective drying system is urgently needed. Utility Model Content

[0011] The technical problem this invention aims to solve is to provide an energy-saving drying system for rice noodles based on heat pump drying technology, particularly suitable for the efficient and low-consumption drying process of starch products (such as rice noodles). By recovering waste heat and precisely controlling the temperature through heat pump technology, energy consumption is significantly reduced and product quality is improved.

[0012] This utility model achieves its invention objective using the following technical solution:

[0013] An energy-saving drying system for rice noodles based on heat pump drying technology is characterized by comprising: a drying chamber, wherein a conveyor belt is installed in the drying chamber; several sets of heat pump units are installed in the drying chamber and matched with the conveyor belt, and each heat pump unit is fixedly connected to an intelligent temperature control module; a heat exchange device, which is fixedly connected to one end of an air inlet pipe, the other end of the air inlet pipe is fixedly connected to the drying chamber, the heat exchange device is fixedly connected to an exhaust pipe, the exhaust pipe is fixedly connected to the drying chamber, and the heat exchange device is fixedly connected to an exhaust chimney.

[0014] As a further limitation of this technical solution, the heat pump unit includes a compressor, an evaporator, a condenser, a throttling valve, and a heat exchanger. The suction port of the compressor is connected to the outlet of the evaporator, the discharge port of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the throttling valve, and the outlet of the throttling valve is connected to the inlet of the evaporator, so as to deliver low-temperature and low-pressure refrigerant to the evaporator.

[0015] As a further limitation of this technical solution, the outer casing of the heat pump unit is provided with an air inlet and an air outlet.

[0016] As a further limitation of this technical solution, the intelligent temperature control module includes a temperature sensor and a PLC controller. The PLC controller is installed inside the heat pump unit, and the temperature sensor is installed at the position of the heat pump unit corresponding to the air outlet.

[0017] As a further limitation of this technical solution, the drying chamber is provided with a feed inlet and a discharge outlet corresponding to the conveyor belt.

[0018] As a further limitation of this technical solution, an induced draft fan is installed on the air intake pipe and the exhaust pipe.

[0019] Compared with related technologies, the energy-saving drying system for vermicelli based on heat pump drying technology provided by this utility model has the following beneficial effects:

[0020] (1) This utility model has significant energy saving: the cost per ton of energy consumption is reduced by 39.7%-46.4%, and the annual standard coal saving is ≥1200 tons (based on 5 production lines); emission reduction and environmental protection: the amount of steam used is reduced, and the annual carbon emissions are reduced by 30%; quality improvement: the product qualification rate is increased to 98%, which meets the GB 2713-2015 standard.

[0021] (2) This utility model recovers the waste heat from dehumidification through a heat pump unit and converts it into drying heat energy, and achieves precise temperature control by combining it with an intelligent temperature control module. The system is compatible with existing production lines, reduces energy consumption cost per ton by 39.7%-46.4%, and keeps the product moisture content stable at 11.0%±0.5%, achieving the triple benefits of high efficiency and energy saving, environmental protection and emission reduction, and quality improvement. Attached Figure Description

[0022] Figure 1 This is a front view of the vermicelli drying production line of this utility model.

[0023] Figure 2 This is a schematic diagram of the airflow in the heat pump dryer unit of this utility model.

[0024] Figure 3 This is a bottom view of the heat pump dryer unit of this utility model.

[0025] Figure 4 This is a schematic diagram of the heat pump working process of the heat pump dryer unit of this utility model.

[0026] In the diagram: 1. Feed inlet, 2. Air inlet pipe, 3. Heat pump unit, 4. Heat exchanger, 5. Exhaust chimney, 6. Drying chamber, 7. Discharge outlet, 8. Conveyor belt, 9. Heat exchanger, 10. Evaporator, 11. Compressor, 12. Air inlet, 13. Air outlet, 14. Temperature sensor, 15. Condenser, 16. Throttling valve, 17. PLC controller, 18. Exhaust pipe, 19. Exhaust fan, 20. Baffle plate. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0028] An energy-saving drying system for rice noodles based on heat pump drying technology includes: a drying chamber 6, in which a conveyor belt 8 is installed; several sets of heat pump units 3, installed in the drying chamber 6 and matched with the conveyor belt 8, with an intelligent temperature control module fixedly connected to each heat pump unit 3; a heat exchange device 4, fixedly connected to one end of an air inlet pipe 2, the other end of which is fixedly connected to the drying chamber 6, the heat exchange device 4 is fixedly connected to an exhaust pipe 18, the exhaust pipe 18 is fixedly connected to the drying chamber 6, and the heat exchange device 4 is fixedly connected to an exhaust chimney 5.

[0029] By recovering waste heat through heat pumps and precisely controlling the temperature, the problems of high energy consumption, large heat loss, and low temperature control accuracy in traditional processes are solved (as shown in Table 3). This results in a 39.7%-46.4% reduction in energy consumption per ton, and the product moisture content is kept stable at 11.0% ± 0.5%.

[0030] Table 3. Energy consumption and cost per ton for vermicelli drying using heat pump technology.

[0031]

[0032] Note: Only introduce a small amount of steam (5-10 minutes) during cold start-up to shorten the preheating time.

[0033] The heat pump unit 3 includes a compressor 11, an evaporator 10, a condenser 15, a throttling valve 16, and a heat exchanger 9. The heating efficiency COP is ≥ 3.5. The suction port of the compressor 11 is connected to the outlet of the evaporator 10 to draw low-temperature, low-pressure refrigerant gas from the evaporator 10. The discharge port of the compressor 11 is connected to the inlet of the condenser 15 to deliver high-temperature, high-pressure refrigerant gas into the condenser 15. The outlet of the condenser 15 is connected to the inlet of the throttling valve 16 to deliver liquid refrigerant into the throttling valve 16. The outlet of the throttling valve 16 is connected to the inlet of the evaporator 10 to deliver low-temperature, low-pressure refrigerant into the evaporator 10.

[0034] The heat pump unit 3 has a fixedly connected flow guide baffle 20 on its outer shell.

[0035] The compressor 11 is the core component of the heat pump unit 3. It compresses the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure gas, providing power for the refrigerant to circulate in the system.

[0036] The function of condenser 15 is to cool the high-temperature and high-pressure refrigerant gas, liquefy it, and at the same time release heat to the surrounding environment (or transfer it to the medium that needs to be heated).

[0037] The function of the throttle valve 16 is to throttle and reduce the pressure of the liquid refrigerant, turning it into a low-temperature, low-pressure liquid refrigerant, which then provides the evaporator with a low-temperature, low-pressure refrigerant.

[0038] Heat exchanger 9 is typically used to transfer heat, and its inlet and outlet are connected to evaporator 10, respectively.

[0039] The outer casing of the heat pump unit 3 is provided with an air inlet 12 and an air outlet 13.

[0040] The intelligent temperature control module includes a temperature sensor 14 and a PLC controller 17. The PLC controller 17 is installed inside the heat pump unit 3, and the temperature sensor 14 is installed in the heat pump unit 3 at the position corresponding to the air outlet 13.

[0041] The drying chamber 6 is provided with an inlet 1 and an outlet 7 corresponding to the conveyor belt 8.

[0042] An induced draft fan 19 is installed on the air intake pipe 2 and the exhaust pipe 18.

[0043] The working principle of the energy-saving vermicelli drying system based on heat pump drying technology provided by this utility model is as follows:

[0044] Main drying stage: The heat pump unit provides high-temperature hot air (80℃-95℃), and the fan sends the hot air into the drying chamber to evaporate the moisture in the vermicelli (fresh vermicelli ratio 1:2.28, 1.28t of moisture needs to be evaporated per ton of vermicelli);

[0045] Air enters the heat pump unit 3 through the air inlet 12. The compressor 11 draws low-temperature, low-pressure refrigerant gas from the evaporator 10 and delivers the high-temperature, high-pressure refrigerant gas to the condenser 15. The condenser 15 delivers liquid refrigerant to the expansion valve 16, which then delivers the low-temperature, low-pressure refrigerant back to the evaporator 10. The evaporator 10 provides energy to the heat exchanger 9, turning the humid air into dry, hot air, which is then discharged.

[0046] Waste heat recovery: After the exhaust air recovers heat through the heat exchanger 4, it is input into the air inlet 12 of the heat pump system to form a closed loop.

[0047] High efficiency and energy saving: The heat pump heating efficiency (COP) reaches 3.5-4.2, and the electricity consumption per ton is reduced to 361.1-486.9 yuan (as shown in Table 4), with an energy saving rate of 39.7%-46.4%.

[0048] Table 4 Comparison of energy consumption and cost per ton for vermicelli drying after energy-saving renovation of a single drying production line.

[0049]

[0050] Precise temperature control: The intelligent module ensures a stable drying temperature curve (e.g., Figure 1 (), moisture content standard deviation ≤ 0.3%;

[0051] High compatibility: It is compatible with both cake flour (500kg / h) and large flour (1000kg / h) production lines, and the cost recovery period for modification is ≤3 years.

[0052] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. An energy-saving drying system for rice noodles based on heat pump drying technology, characterized in that, include: A drying chamber (6) is provided with a conveyor belt (8). Several heat pump units (3) are installed in the drying chamber (6) and matched with the conveyor belt (8). Each heat pump unit (3) is fixedly connected to an intelligent temperature control module. The heat exchange device (4) is fixedly connected to one end of the air inlet pipe (2), and the other end of the air inlet pipe (2) is fixedly connected to the drying chamber (6). The heat exchange device (4) is fixedly connected to the exhaust pipe (18), the exhaust pipe (18) is fixedly connected to the drying chamber (6), and the heat exchange device (4) is fixedly connected to the exhaust chimney (5).

2. The energy-saving drying system for vermicelli based on heat pump drying technology according to claim 1, characterized in that: The heat pump unit (3) includes a compressor (11), an evaporator (10), a condenser (15), a throttle valve (16), and a heat exchanger (9). The suction port of the compressor (11) is connected to the outlet of the evaporator (10), the discharge port of the compressor (11) is connected to the inlet of the condenser (15), the outlet of the condenser (15) is connected to the inlet of the throttle valve (16), and the outlet of the throttle valve (16) is connected to the inlet of the evaporator (10), thereby delivering low-temperature and low-pressure refrigerant to the evaporator.

3. The energy-saving drying system for vermicelli based on heat pump drying technology according to claim 2, characterized in that: The heat pump unit (3) has an air inlet (12) and an air outlet (13) on its outer casing.

4. The energy-saving drying system for vermicelli based on heat pump drying technology according to claim 3, characterized in that: The intelligent temperature control module includes a temperature sensor (14) and a PLC controller (17). The PLC controller (17) is installed inside the heat pump unit (3), and the temperature sensor (14) is installed on the heat pump unit (3) at the position corresponding to the air outlet (13).

5. The energy-saving drying system for vermicelli based on heat pump drying technology according to claim 1, characterized in that: The drying chamber (6) is provided with a feed inlet (1) and a discharge outlet (7) corresponding to the conveyor belt (8).

6. The energy-saving drying system for vermicelli based on heat pump drying technology according to claim 1, characterized in that: A blower (19) is installed on the air intake pipe (2) and the exhaust pipe (18).

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