Burner-Type Pre-Furnace
Pre-furnace is a water-cooled combustion chamber that allows a solid-fuel system with a rotary grate to be added to existing steam boilers, regardless of their design. Existing boilers operated by liquid/gas burners can be converted to run on economical solid fuels such as coal and biomass by adding the pre-furnace and rotary grate. Its water-cooled membrane-tube design withstands high temperatures while transferring the generated heat directly to the boiler water; complete combustion is ensured by the rotary grate behind it, resulting in high efficiency and low emissions. With its robust steel construction and low heat loss, it offers a long-lasting, economical solution.
Burner-Type Pre-Furnace
A pre-furnace is a water-cooled combustion chamber mounted in front of the boiler that allows a rotary-grate solid fuel combustion system to be added to existing steam boilers, whatever their design. Standard boilers are generally designed to operate with liquid- or gas-fired burners; with the pre-furnace and rotary grate system, these boilers can be converted to run on solid fuels such as coal and biomass. This allows plants to switch to far more economical solid fuel while retaining their existing boiler structures. Although in practice it is most often added to Scotch-type (fire-tube) boilers, the pre-furnace can also be adapted to other boiler types.
The cylindrical combustion throat on the front face of the unit is a water-cooled structure formed of membrane (water-wall) tubes; the combustion chamber walls are thus cooled continuously, which provides resistance to high temperatures and transfers a significant share of the released heat directly to the boiler water. Solid fuel burned on the rotary grate positioned behind the pre-furnace produces high-temperature combustion gases, which complete their combustion within the pre-furnace volume and are then directed to the boiler’s heat transfer surfaces.
This design provides sufficient volume, residence time and temperature in the combustion chamber, ensuring complete combustion of the fuel and therefore high combustion efficiency and low emission values. The water-cooled membrane wall design offers lower surface heat loss and a longer service life than conventional firebrick-lined combustion chambers. The pre-furnace body is sized according to the capacity of the boiler it will be added to and the properties of the fuel to be burned; its robust steel construction, easy installation and durable build ensure safe operation for many years.
- A water-cooled pre-furnace that enables the addition of solid fuel to existing steam boilers, regardless of their design
- The ability to convert an existing boiler to operate on coal or biomass
- Applicable to the most common Scotch-type (fire-tube) boilers; can also be adapted to other boiler types
- Cylindrical combustion throat with membrane tubes
- High-temperature resistance and heat recovery thanks to its water-cooled wall structure
- Integrated operation with a solid fuel combustion system featuring a rotary grate located behind it
- Sufficient volume, residence time, and combustion temperature for complete combustion
- High combustion efficiency and low emission levels
- Low surface heat loss and long service life
- Robust steel construction
- Custom sizing based on boiler capacity and fuel characteristics
Optional Equipment:
- Solid fuel combustion system with rotary grate
- Economizer or recuperator (flue gas heat recovery system)
- Thermocouple / PT100 temperature measurement equipment
- Combustion air fan and air duct connections
- Inspection and maintenance hatches
- Addition of solid fuel to any type of existing boiler — converting the boiler to coal/biomass
- Water-cooled membrane-tube combustion chamber — high durability, long service life
- Fully integrated operation with a solid fuel system featuring a rotary grate
- High efficiency and low emissions through complete combustion
- Low surface heat loss and direct heat recovery
- Sizing tailored to the specific boiler and fuel
Pre-furnace converts existing steam boilers to run on solid fuel, making them suitable for use in all industrial facilities where solid fuel is cost-effective:
Food and Beverage: Dairy products, canned goods, tomato paste, and oil production — process steam requirements
Textiles and Dyeing: Dyeing, finishing, and drying processes
Energy and Process Facilities: High-capacity continuous steam/heat production
Chemicals and Pharmaceuticals: Process heating and sterilization lines
Lumber, Wood, and Particleboard: Drying ovens and steaming — economic advantages with biomass fuel
Agricultural Processing and Feed: Drying, pelletizing, and processing facilities
It offers significant fuel cost savings, particularly for businesses looking to convert their existing boilers from expensive liquid or gaseous fuels to coal or biomass.
Companies we have delivered this boiler to
- Sılam YağBursa
- Eyvan YağŞanlıurfa
- Tüzünler YağAksaray · 7,500,000 kcal/h
- Rella GıdaManisa · 3,000,000 kcal/h
- CP YemManisa · 3,500,000 kcal/h
- Şitoğlu GıdaMalatya · 3,500,000 kcal/h
- Atılım DesenBursa · 3,000,000 kcal/h
Burner-Type Pre-Furnace — let’s size it together
Our engineers plan capacity, pressure and fuel choice for your needs.