AIRPAC
Rice Husk & Sawdust Fired Hot Air Generator
The AIRPAC Series is a robust, horizontal four-pass indirect-fired hot air generator engineered for high-capacity industrial thermal requirements. Designed with ultimate fuel flexibility in mind, the AIRPAC utilizes Fluidized Bed Combustion (FBC) technology to efficiently burn a wide variety of free-flowing biomass fuels, including rice husk, sawdust, and pulverized coal.
By utilizing an indirect-fired shell and tube heat exchanger, the AIRPAC delivers clean, uncontaminated hot air, making it ideal for sensitive industrial drying and processing applications.
Operating Range
- Capacity – 0.4 million kcal/hr. to 10.0 million kcal/hr.
- Fuel- saw dust, rice husk, pulverizes coal.
- Temperature- up to 300 ºC
Advanced FBC Technology & Four-Pass Design
The AIRPAC is engineered to extract every possible calorie from low-cost biomass fuels:
- Fluidized Bed Combustion (FBC): This technology ensures complete combustion of biomass fuels by suspending them in a hot, bubbling bed of silica sand. This results in higher thermal efficiency and significantly lower emissions.
- Four-Pass Heat Recovery: The combustion gases travel through four distinct stages within the shell and tube heat exchanger. This "Four-Pass" travel maximizes the contact time between the hot gases and the air-carrying tubes, ensuring peak efficiency.
- Automated Fuel Feeding: Equipped with a precision-engineered Screw Feeding System, managed by an A.C. Drive. This allows for automated, steady fuel input and precise temperature control.
Key Features & Advantages
- Ultimate Fuel Flexibility: Specifically designed to fire low-cost, locally available fuels like rice husk, sawdust, and pulverized coal.
- Clean Hot Air: The indirect-fired design ensures that combustion gases never mix with the process air, providing a 100% clean heat source.
- Zero Operating Pressure: Unlike steam systems, the AIRPAC operates at atmospheric pressure, eliminating the need for high-pressure vessel certifications and specialized boiler attendants.
- High Capacity Range: Capable of delivering up to 10 million Kcal/hr, making it suitable for large-scale industrial plants.
Industry Applications
The AIRPAC is the ideal thermal solution for high-volume drying and processing in the following sectors:
- Rice Mills: For parboiling and drying large quantities of paddy using the mill's own husk as fuel.
- Chemical & Fertilizers: For spray drying and moisture removal in chemical powders.
- Agriculture & Seed Processing: Large-scale drying of grains, seeds, and pulses.
- Plywood & Laminates: For veneer drying and high-temperature curing processes.
- Textiles: For stenter heating and fabric drying applications.
Frequently Asked Questions (FAQ) about Rice Husk & Sawdust Fired Hot Air Generator
FBC technology allows for the efficient burning of low-calorific value fuels like rice husk or sawdust. It provides a more uniform temperature in the furnace, ensuring complete combustion and reducing the formation of unburnt carbon (clinkers).
In an indirect system, the air you use for your process is heated through a heat exchanger and never comes into contact with the smoke or ash from the fuel. This ensures the hot air remains 100% clean and free from contamination.
No. The AIRPAC features a fully automated screw feeding system. An A.C. Drive controls the speed of the screw based on your temperature requirements, ensuring a consistent and "hands-free" operation.
Yes. The AIRPAC is designed for fuel flexibility. As long as the fuel is "free-flowing" (small particles), the system can be calibrated to handle various biomass types or pulverized coal depending on seasonal availability.
The "pass" refers to how many times the hot gases travel through the heat exchanger. A four-pass design is highly efficient because it squeezes more heat out of the fuel before the gases reach the chimney, significantly lowering your operational costs.