The black tea drying machine is a closed-chamber batch dryer designed to stop fermentation and reduce moisture in fully oxidized black tea leaves. It processes 300–8,000 kg of fermented tea per batch. Freshly fermented leaves enter at 55–65% moisture. The system reduces this to 3–5% within 2–4 hours. Dried black tea is ready for grading, sorting, and packaging for domestic sale or export.
Conventional charcoal-fired dryers run at 100–120°C with no humidity control. This black tea dryer operates at 70–105°C in a sealed chamber with ±1°C temperature precision. The heat pump recycles thermal energy from exhaust air. It delivers a COP of 3.0–4.0. Electricity consumption drops by 60–70% compared to direct electric heating. A PLC touchscreen lets operators program multi-stage drying profiles. Chamber temperature stays within ±1°C. Relative humidity stays within ±3%. The 2–4 hour cycle enables 4–6 batches per day during peak harvest.
Shuliy has manufactured industrial drying equipment for over 20 years. The company has exported heat pump dryers to more than 30 countries. All chambers use 304 stainless steel trays. Housing options include galvanized steel and SUS304. The system meets EU and FDA food-contact material standards. A 12-month warranty covers all mechanical and electrical components. Lifetime technical consultation is included.
Why Must Black Tea Be Dried?
After full fermentation, black tea leaves still contain 55–65% moisture and active enzymes. Without timely and controlled drying, quality deteriorates rapidly.
- Over-Fermentation: Enzymatic activity continues. The tea develops a sour, overripe flavor. Astringency increases. Market grade drops.
- Color Degradation: Uncontrolled moisture causes uneven oxidation. Leaf color turns dull brown instead of the desired dark amber. Buyers reject discolored batches.
- Mold Growth: Moisture above 8% creates ideal conditions for Aspergillus and Penicillium mold. Aflatoxin contamination becomes a food safety risk.
- Aroma Loss: Volatile aromatic compounds evaporate unevenly. The characteristic malty, floral, or fruity notes fade. Tea loses its premium classification.
The Shuliy black tea drying machine solves these problems through staged temperature control. A three-phase drying profile stops fermentation at the optimal point. Moisture draws evenly from each leaf. Aroma compounds are locked in. The final product reaches 3–5% moisture with batch uniformity within ±0.5%.
¿Qué es una máquina de secado de té negro?
Un secador de té negro es un dispositivo de circulación de aire caliente diseñado específicamente para secar té negro fermentado. Las hojas de té se distribuyen uniformemente en bandejas y se deshidratan en etapas con aire caliente controlable, logrando un secado estable y eficiente.
En comparación con métodos tradicionales de secado al sol o tostado manual, el secador de té negro ofrece ventajas claras:
- Temperatura controlable, menos afectada por el entorno
- Procesamiento por lotes para mayor eficiencia de producción
- Calidad estable, adecuada para producción estandarizada
- Reduce costos laborales y dependencia de la experiencia
Especificaciones técnicas
| Parámetro | Especificación | Valor para el cliente |
|---|---|---|
| Rango de modelos | SL-2 a SL-24 | 8 models from 300–8,000 kg for precise capacity matching |
| Método de secado | Bomba de calor de fuente de aire | 70% energy savings versus electric heating; zero combustion emissions |
| Rango de temperatura | 30–110°C (adjustable) | 70–105°C optimal for black tea; stops fermentation without scorching |
| Control Precision | ±1°C temperature; ±3% RH humidity | Prevents over-drying and under-drying within the same batch |
| Capacidad de lote | 300–8,000 kg fermented tea | Scales from small tea estate to industrial export volume |
| Drying Cycle | 2–4 hours/batch | 4–6 batches per day during peak harvest season |
| Material de la Bandeja | 304 stainless steel (perforated) | Food-grade, corrosion-resistant, easy to clean |
| Chamber Construction | Galvanized steel or SUS304 | 75 mm rock wool insulation; durable frame |
| Sistema de control | PLC with HMI touchscreen | Automated profiles reduce labor and human error |
| Humedad final | 3–5% | Optimal for grading, packaging, and 24-month storage |
| Consumo de energía | 3–36 kW (model dependent) | Low operating cost; suitable for rural tea estate power supply |
| Aislamiento | Lana de roca de alta temperatura de 75 mm. | 20% energy efficiency improvement over uninsulated chambers |
Model Selection Guide
| Modelo | Dimensions (mm) | Drying Crews | Capacidad (kg/lote) |
|---|---|---|---|
| SL-2 | 4,000 × 1,860 × 2,500 | 2 | 300–600 |
| SL-4 | 6,000 × 1,860 × 2,500 | 4 | 500–1,000 |
| SL-6 | 7,200 × 2,300 × 2,500 | 6 | 800–1,500 |
| SL-8 | 8,500 × 2,300 × 2,500 | 8 | 1,000–2,000 |
| SL-10 | 10,000 × 2,300 × 2,500 | 10 | 1,200–2,500 |
| SL-12 | 8,500 × 3,300 × 2,500 | 12 | 2,500–4,000 |
| SL-18 | 8,500 × 5,000 × 2,500 | 18 | 4,000–6,500 |
| SL-24 | 12,000 × 5,000 × 2,500 | 24 | 5,000–8,000 |
How Does the Black Tea Dryer Work?
El secador de té negro utiliza un sistema de circulación de aire caliente, permitiendo que el aire calentado fluya de manera uniforme por toda la cámara de secado. Este flujo continuo de aire elimina la humedad de las hojas de té, logrando un secado controlado.
1. Evaporation Stage
Ambient air passes across the evaporator coil. Refrigerant absorbs thermal energy. The air is pre-cooled.
2. Compression Stage
The compressor raises refrigerant temperature and pressure. A high-grade heat source is created.
3. Condensation Stage
Hot refrigerant circulates through the condenser coil inside the drying chamber.
Circulated air heats to the setpoint temperature of 70–105°C.
4. Dehumidification Stage
Warm, moist air passes over the evaporator coil.
Water vapor condenses into liquid. The condensate drains from the system.
The dry air is reheated and recirculated.
5. Control Stage
PLC sensors monitor temperature, humidity, and airflow.
Compressor speed, fan velocity, and exhaust damper position adjust in real time.
The energy-recovery design produces 3–4 kW of usable heat per 1 kW of electrical input.
Conventional electric dryers produce only 1 kW of heat per 1 kW of input.
Black Tea Drying Process: Step by Step
1. Feeding and Spreading
- Fully fermented black tea leaves are evenly spread on drying trays or conveyor belts to ensure uniform heating.
2. Hot-Air Heating and Circulation
- The heating system (electric, gas, or biomass) heats the air, and fans circulate the hot air throughout the drying chamber to avoid local overheating.
3. Secado en etapas con control de temperatura
- Secado inicial (80–90°C): Elimina rápidamente la humedad superficial y previene que las hojas se peguen.
- Secado principal (90–105°C): Deshidratación uniforme, fijando la estructura de aroma y sabor.
- Secado final (70–85°C): Estabiliza el contenido de humedad sin dañar el aroma.
4. Moisture Exhaust and Air Exchange
- Moist, hot air is expelled through the exhaust system while fresh air enters, maintaining a stable drying environment. The final moisture content is generally controlled at ≤5%.
5. Discharge and Cooling
After drying, tea leaves are discharged and cooled naturally or with assistance to prevent reabsorption of moisture.
Principales ventajas de usar una máquina de secado de té negro
Secado uniforme
Las hojas de té se calientan de manera uniforme, asegurando un color y sabor consistentes.
Alta eficiencia y capacidad controlable
Adecuado para pequeñas fábricas de té hasta producción a gran escala.
Múltiples opciones de fuente de calor
Puede usar calefacción eléctrica, de gas o biomasa, adaptándose a las condiciones energéticas locales.
Fácil operación y mantenimiento
Adecuado para producción continua y uso a largo plazo.
Escenarios aplicables para secadores de té negro
Los secadores de té negro se utilizan ampliamente para:
- Procesamiento de té negro de hoja entera y té negro roto (CTC)
- Producción de té negro en fábricas pequeñas y medianas
- Empresas de procesamiento de té negro orientadas a la exportación
- Líneas de producción de té negro estandarizadas y a gran escala
¿Cómo elegir la máquina de secado de té negro adecuada?
Al seleccionar un máquina de secado de té negro, se recomienda centrarse en:
- Capacidad de procesamiento por lote o por hora requerida
- Tipos de fuente de calor disponibles
- Espacio y distribución del taller
- Condiciones locales de temperatura y humedad
Elegir el modelo adecuado puede no solo mejorar la eficiencia de secado, sino también reducir eficazmente el consumo de energía y los costos operativos.
¿Cómo hacer té negro?
Cosecha
- Seleccionar hojas de té tiernas con un brote y una o dos hojas para garantizar la calidad de la materia prima.
Marchitamiento
- Utilizar habitaciones de marchitamiento controladas por temperatura y humedad o secar al aire natural para reducir la humedad y ablandar las hojas, preparándolas para enrollar y fermentar.
Enrollado
- Romper las células de las hojas para liberar jugo, formando tiras o hojas rotas, lo que favorece la oxidación de los polifenoles.
Fermentación
- Fermentar completamente las hojas bajo temperatura y humedad adecuadas, transformándolas de verdes a rojas y desarrollando el aroma y sabor únicos del té negro.
Secado
- Utilizar cámaras de secado o secadores de aire caliente para detener la fermentación, reducir el contenido de humedad a ≤5% y fijar aroma y sabor.
Clasificación
- Clasificar el té según tiras de hoja, hojas rotas y apariencia para garantizar uniformidad y calidad estable.
Embalaje
- Sellar el té seco y clasificado para prevenir humedad y olor, haciéndolo apto para almacenamiento y transporte.
Shuliy ofrece una gama de secadores de té negro en acero inoxidable y materiales estándar, todos personalizables. Para más información, no dudes en contactarnos.
Solving Common Black Tea Drying Challenges
| Customer Pain Point | Solución Shuliy | Result |
|---|---|---|
| Over-fermentation from slow drying | Staged temperature profile (80°C → 105°C → 70°C) | Enzymatic activity stopped within 20 minutes; flavor locked in |
| Uneven moisture causing mold in storage | 360° turbulent airflow and automated humidity exhaust | Batch uniformity within ±0.5% moisture deviation |
| Aroma loss from excessive heat | Final drying phase at 70–85°C with controlled exhaust | Volatile compound retention above 90%; premium grade maintained |
| High fuel costs from charcoal or biomass | Heat pump COP 3.0–4.0 with energy recovery | 60–70% reduction in drying energy cost per kg |
| Seasonal harvest peaks overwhelming capacity | Modular SL-series from 300–8,000 kg; 2–4 h cycles | 4–6 batches per day; multi-chamber expansion available |
| Export rejection due to moisture non-compliance | Precise 3–5% final moisture with PLC verification | Full compliance with ISO 3720 and buyer specifications |
Why Choose Shuliy Black Tea Drying Equipment?
- Proven Heat Pump Technology: Thousands of installed drying rooms across agricultural and food processing sectors. System reliability is validated in real-world conditions.
- Application-Specific Expertise: Drying protocols for orthodox whole-leaf, CTC, and broken black tea are pre-programmed into the PLC. Commissioning time is reduced. Operator training is simplified.
- Full Material Traceability: All stainless steel components carry mill test certificates. Chamber insulation meets fire-rating and thermal-conductivity standards for international export.
- Integrated Processing Lines: Shuliy supplies withering troughs, rolling machines, fermentation chambers, and grading sorters. Turnkey black tea processing projects are supported.
- Global Export Experience: CE-certified electrical systems. Multi-voltage compatibility (220V/380V/415V/460V). ISPM-15 compliant export packing ensures smooth customs clearance.