一种食品热风烘干余热回收系统
By designing a waste heat recovery system for food hot air drying, the system condenses moisture in the humid air and recovers waste heat, solving the problem of unrecoverable waste heat from humid air and achieving efficient energy utilization and environmental protection and energy-saving effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DALIAN BAOGUANG ENERGY SAVING AIR CONDITIONING CO LTD
- Filing Date
- 2025-07-22
- Publication Date
- 2026-07-17
AI Technical Summary
In existing hot air drying technology, the residual heat in the humid air after drying cannot be effectively recovered, resulting in serious energy waste, and the open-loop circulation consumes a lot of heat.
Design a waste heat recovery system for food hot air drying. By condensing the moisture in the humid air after drying, the waste heat is recovered and reused in the drying process, realizing a closed loop and reducing steam consumption.
It enables the recovery and reuse of waste heat in humid air, reducing energy consumption, carbon emissions, and improving energy efficiency.
Smart Images
Figure CN224517328U_ABST
Abstract
Claims
1. A food hot-air drying waste heat recovery system, characterized by: The system consists of five parts: fresh air external circulation, waste heat recovery internal circulation, parallel waste heat recovery unit, heating system, drying device, and PLC system. The fresh air external circulation and waste heat recovery internal circulation are switched by the PLC system. The fresh air external circulation needs to be completed more than once before it can be switched to the waste heat recovery internal circulation mode. The waste heat recovery internal circulation includes a parallel waste heat recovery unit (6) composed of drying waste heat recovery devices (7). The air volume regulating valve 2 (11-2) and the exhaust air volume regulating valve 3 (11-3) are closed. The air outlet of the drying device (5) is connected to the air inlet (7-5) of each drying waste heat recovery device (7) in the parallel waste heat recovery unit (6) through the air duct. The air volume regulating valve group (11-4) between the waste heat recovery unit (6) and the drying device (5) is open. The air outlet (7-12) of each drying waste heat recovery device (7) is connected in parallel through the air duct and transported back to the inlet of the drying device (5) to complete the circulation.
2. The food hot-air drying waste heat recovery system according to claim 1, characterized in that: The heating system includes a steam boiler (1) with a steam pump (2) installed at the steam supply port, which is started in the state. The steam inlet of the steam heat exchanger (3) is connected through a steam pipe. The steam outlet of the steam heat exchanger (3) is connected to the steam boiler (1) through a steam pipe. The steam outlet and steam inlet of the steam heat exchanger (3) are equipped with a valve group (10) which is opened in the external circulation state.
3. The food hot-air drying waste heat recovery system according to claim 1, characterized in that: The fresh air external circulation includes fan 1 (9-1). When fan 1 (9-1) is started, it is connected to air volume regulating valve 1 (11-1). When air volume regulating valve 1 (11-1) is open, air volume regulating valve 1 (11-1) is connected to the fresh air inlet of gas heat exchanger (4) through air duct. The fresh air outlet of gas heat exchanger (4) is connected to the fresh air inlet of steam heat exchanger (3) through air duct. When air volume regulating valve 2 (11-2) of steam heat exchanger (3) is open, air volume regulating valve 2 (11-2) is connected to the fresh air inlet of drying device (5) through air duct. When moisture outlet of drying device (5) is connected to moisture inlet of gas heat exchanger (4) through air duct, air volume regulating valve 3 (11-3) is set at the front end of moisture inlet and is open. When air volume regulating valve group (11-4) is closed, exhaust port (4-1) is set at moisture outlet of gas heat exchanger (4).
4. The food hot-air drying waste heat recovery system according to claim 1, characterized in that: The parallel waste heat recovery unit (6) is composed of a drying waste heat recovery device (7) connected in parallel. The drying waste heat recovery device (7) consists of two parts. The upper part is a heat recovery device. The refrigerant is transported to the heating coil (7-9) through the refrigerant channel by the electric driven compressor (7-1) for condensation and heat release. After condensation, the refrigerant is transported to the dehumidifying surface cooler (7-7) through the refrigerant channel by the expansion valve (7-4) to complete the evaporation and heat absorption, thus completing the cooling and heating cycle. The lower part is an air channel. The humid air completes the two processes of condensation and dehumidification and heating in the lower air channel. The humid air is transported to the primary filter (7-6) through the air inlet (7-5) and filtered. After passing through the dehumidifying surface cooler (7-7), the condensate is discharged through the condensate drain pipe (7-8). The gas then passes through the heating coil (7-9) and is filtered through the secondary filter (7-11). It is then transported back to the drying device (5) from the air outlet (7-12) to complete the cycle.
5. The food hot-air drying waste heat recovery system according to claim 1, characterized in that: The PLC system is used to switch between fresh air external circulation and waste heat recovery internal circulation. When the fresh air external circulation is running, the air volume regulating valve 1 (11-1), air volume regulating valve 2 (11-2), air volume regulating valve 3 (11-3), and valve group (10) are open, and the air volume regulating valve group (11-4) is closed.
6. The food hot-air drying waste heat recovery system according to claim 5, characterized in that: Before the system switches states, the waste heat recovery internal circulation completes one fresh air external circulation operation. The air volume regulating valve 1 (11-1), air volume regulating valve 2 (11-2), air volume regulating valve 3 (11-3), and valve group (10) are closed, and the air volume regulating valve group (11-4) is open.