VFF SERIES
VFF SERIES

Vertical Four Pass FBC Thermic Fluid Heater

  • Overall efficiency of 80 % (+/-2%) on NCV with APH.
  • High-capacity heating system
  • Multi-fuel option - heavy oils, light oils and gases
  • Rugged - requires very little maintenance
  • Over-bed & under-bed fuel firing systems can be incorporated
  • Large in-bed and convective heat transfer area
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VFF SERIES
Features

Vertical Four Pass FBC Thermic Fluid Heater

The VFF Series represents the pinnacle of high-capacity thermal heating, utilizing Fluidized Bed Combustion (FBC) technology. This vertical four-pass system is specifically engineered to provide maximum thermal efficiency by firing a wide range of low-cost, free-flow solid fuels, including agro-waste and pulverized coal.

By combining a four-pass radiant-convective heat transfer design with advanced FBC technology, the VFF Series allows for high process temperatures at remarkably low operating pressures, ensuring both safety and significant fuel cost savings.

Operating Range

  • Capacity – 0.4 to 10.0 million kcal/hr
  • Fuel- pulverized coal, rice husk, sawdust, petcock
  • Temperature - 300℃
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Advanced Fluidized Bed Combustion (FBC)

The VFF Series is designed for versatile fuel handling. The combustion system features:

  • Automated Fuel Feeding: High-efficiency screw feeders for consistent fuel delivery.
  • Precision Air Handling: Integrated I.D. (Induced Draft) and F.D. (Forced Draft) fans work in tandem with a specialized air plenum and nozzles to maintain a suspended "fluidized" bed of fuel for complete combustion.
  • On-Site Furnace Construction: The refractory-lined chamber is precision-built on-site to ensure optimal insulation and thermal retention.

Key Features & Benefits

  • Four-Pass Design: This unique configuration maximizes the contact time between flue gases and the heating coils, resulting in superior heat recovery compared to standard three-pass systems.
  • Multi-Fuel Flexibility: Designed to burn cost-effective "free-flow" fuels like Rice Husk, Sawdust, Pulverized Coal, and Petcoke.
  • Eco-Friendly Operation: Equipped with advanced pollution control equipment to meet stringent environmental standards.
  • Low Pressure, High Heat: Achieve temperatures up to 300°C at near-atmospheric pressures, reducing the risks associated with high-pressure steam systems.

Industries Served

The VFF Series is the preferred choice for large-scale industrial applications requiring consistent, high-temperature heat:

  • Textiles: For fabric processing, dyeing, and stenter operations.
  • Chemical & Pharma: For reactors, distillation, and high-heat processing.
  • Plywood & Laminates: For pressing and resin curing.
  • Food Processing: For large-scale drying, roasting, and edible oil refining.
  • Rubber & Plastics: For vulcanizing and extrusion processes.

Technical Specifications

Specification Unit VFF-400 VFF-600 VFF-800 VFF-1000 VFF-1500 VFF-2000 VFF-2500 VFF-3000 VFF-4000
General
Maximum heat output M. Kcal/hr 0.4 0.6 0.8 1.0 1.5 2.0 2.5 3.0 4.0
Maximum working temperature °C 280 280 280 280 280 280 280 280 280
Thermic fluid heater Rise temperature °C 30 30 30 30 30 30 30 30 30
Hot Oil Inlet/Outlet MM 80 80 100 100 120 150 150 200 200
Heating surface area of heater M² 40 60 80 100 150 200 250 300 400
Oil holding capacity of heater liter 475 570 1015 1250 2350 3150 3780 4500 6220
Firing Mode Automatic throw Screw feeder
Type of Fuel Fuel Crushed Briquette, Rice husk, Coal,
Boiler Efficiency
On Crushed Briquette % 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2
On Rice Husk % 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2
On Coal % 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2 78 +/-2
Fuel Consumption
Crushed Briquette (4000) Kg/hr 128 192 256 321 481 641 801 962 1282
Rice Husk (3000) Kg/hr 171 256 342 427 641 855 1068 1282 1709
Coal (4500) Kg/hr 114 171 228 285 427 570 712 855 1140
Electrical Load
Circulation Oil Pump H.P. 10.00 15.00 20.00 25.00 30.00 40.00 50.00 60.00 75.00
ID fan without BF H.P. 5.00 7.50 10.00 10.00 15.00 20.00 25.00 30.00 40.00
FD fan with APH H.P. 5.00 7.50 10.00 10.00 15.00 20.00 25.00 30.00 40.00
SFD fan with Motor H.P. 1.00 1.00 1.00 2.00 2.00 2.00 3.00 3.00 4.00
Screw feeder H.P. 1.00 2.00 1.00 2.00 2.00 2.00 3.00 3.00 4.00
Total Electric Load H.P. 22.00 33.00 42.00 49.00 64.00 84.00 106.00 126.00 163.00
NOTE: In view of constant endeavors to improve our products, we reserve the right to alter or change above specifications without prior notice.
  • GCV of crushed briquette is 4000 Kcal/KG.
  • GCV of rice husk is 3000 Kcal/KG.
  • GCV of coal is 4500 Kcal/KG.

Frequently Asked Questions (FAQ) about Vertical Four Pass FBC Thermic Fluid Heater

A Four-Pass design forces the hot gases to travel through the heater one extra time before exiting. This allows more heat to be absorbed by the thermic fluid, leading to lower stack temperatures and significantly higher overall fuel efficiency.

FBC technology keeps the fuel particles suspended in a hot bed of sand or ash using high-pressure air. This ensures 100% combustion of low-grade fuels like rice husk or sawdust, which would otherwise be difficult to burn efficiently in a standard grate furnace.

Yes. To handle the fly ash and emissions from solid fuels like coal or husk, the VFF series comes integrated with high-efficiency pollution control equipment (such as Cyclones or Bag Filters) to ensure your facility stays compliant with environmental regulations.

Absolutely. We can calibrate the screw feeders, air nozzles, and furnace volume to optimize performance based on the specific type of agro-waste or coal available in your region.

While the pressure parts and structure are fabricated at our facility, the refractory brickwork and furnace assembly are completed on-site. This ensures the furnace is perfectly integrated with the foundation and supporting structure for maximum durability.