Lychee Drying machine
Lychee Drying machine, fruits drying machine
Tropical fruit drying machine
**Raw Material Selection:**
* Choose lychee varieties where the dried shell does not separate easily from the aril, such as Nuomici (Glutinous Rice Ball), "Feizixiao" (Imperial Concubine Smile),
Xiangli (Fragrant Lychee), etc.
* Select large, round, and well-shaped fruits with thick flesh, small pits, high dry matter content, strong fragrance, and mild astringency. The raw material should
be at 70-80% maturity.
* Avoid shells that are too thin to prevent cracking, breakage, or collapse during drying.
* Different lychee varieties have different drying yields. For 100 kg of dried lychee product, the required fresh lychees are:
* Nuomici: 400-450 kg
* Xiangli: 380-420 kg
* Heiye (Black Leaf), Heli: 320-360 kg
**Drying Stages:**
1. **Initial Drying Stage:**
* Heat slowly to prevent shell cracking. Control temperature at approximately 55°C.
* Moisture levels are not excessively high at this stage. To rapidly increase the temperature inside the drying chamber, humidity
can be controlled at around 60%.
* Duration: 4 hours.
2. **Mid-Drying Stage:**
* The lychee shells now appear dry. Control temperature at 65°C.
* Control chamber humidity at 30%.
* Maintain these conditions continuously.
* Duration: 8 hours.
3. **Cooling Period:**
* After approximately 12 hours of drying (Initial + Mid stages), the lychee exteriors are very dry. Continuing to dry further risks over-drying
and cracking the shells.
* Therefore, remove the lychees and allow them to cool for 5-6 hours. This allows internal moisture to migrate towards the surface, preparing
them for the final drying phase.
4. **Final Drying Stage:**
* Increase temperature to 65°C and continue drying.
* Duration: 8-10 hours, or until completely dry throughout.
---
**I. Lychee Drying Machine Introduction**
* A heat pump is essentially a device that upgrades heat energy.
* High-temperature heat pump dryers utilize the reverse Carnot principle. They absorb heat from the surrounding environment and
transfer it to the object being heated (the object at a higher temperature). Their operating principle is similar to a refrigerator,
both working on a reverse Carnot cycle, differing mainly in their operating temperature ranges.
* Using electrical energy, they absorb free heat from the air and transfer it into the drying chamber (inputting 1 kWh of electricity
can generate 4 kWh of heat energy). This raises the temperature inside the drying chamber. Combined with appropriate dehumidification
equipment, this achieves drying of the material.
* An air-source heat pump dryer consists of a compressor, condenser (heater), expansion device (electronic expansion valve),
evaporator (heat absorber), and other components forming a refrigeration/heat pump cycle system.
* The refrigerant circulates within the system driven by the compressor. Inside the compressor, the refrigerant gas is pressurized
and its temperature rises. It then enters the condenser, releasing high-temperature heat to warm the air in the drying chamber
while being cooled itself and condensing into a liquid.
* When the liquid refrigerant reaches the evaporator, it rapidly evaporates (absorbs heat) and turns back into gas, simultaneously
dropping in temperature. This causes the air around the evaporator to continuously transfer its heat to the refrigerant.
* Through this continuous refrigerant cycle, heat from the air is effectively "moved" into the drying chamber, heating the chamber
air to the level required for drying materials.
**II. Lychee Drying Machine Intelligent Control Panel**
* Intelligent touch screen controller for a more convenient and simpler operation experience.
* Integrates drying, ventilation, dehumidification, cold drying, and programming functions.
* Features 10 independent time segments for precise control of temperature, humidity, and time.
* **A.** Stable performance, easy operation, multi-functional, meets drying requirements for various materials.
* **B.** Utilizes programmable control; allows setting different drying curves (e.g., temperature, humidity, time).
* **C.** The heat pump in the drying unit not only dries but also has refrigeration and heating functions,
enabling low-temperature processing, greenhouse heating, and other applications.
* **D.** Equipped with power-off memory function; one-key settings for intelligent management.
**III. Advantages of the Lychee Drying Machine:**
1. **Significant Energy Saving & Environmental Protection:** Saves over 75% energy compared to traditional energy-powered dryers.
Produces no harmful substances or gases during operation, fully meeting China's energy-saving and emission-reduction requirements.
2. **Protects Medicinal Properties:** The circulating heat supply method ensures uniform heating of materials (like herbs),
protecting their medicinal quality and pharmacological properties from easy damage.
3. **Gentle, Uniform Drying:** Employs low-temperature hot air convection and low-temperature drying with slow dehydration.
This ensures uniform moisture removal and minimizes damage to the material's cellular structure.
4. **Preserves Aromatic Compounds:** Many materials (like herbs) contain aromatic compounds. Loss of these compounds is related
to temperature, humidity, and oxidation. Low-temperature drying generally helps retain aromatic substances better.
5. **Intelligent Automation & Digital Touch Screen:** Precise temperature control via digital touch screen. Capable of 24-hour unmanned operation.