BWE

Boiler concept

3 PASS BOILER SH & RH

Agricultural Biomass Residue High Alkaline.
Base: Wheat Straw, Rice Straw, Corn Stover, Mustard Husk, Palm Leaves, Sugarcane Top Trash...

Supplement: Wood Chips, Wood Pellets...
Fuel: 100% Base & 50% Supplement
Type: Three Pass Boiler Design
Water Cooled Vibration Grate
Double Screw Stoker
Combustion Air PreHeating
Submerged Bottom Ash Conveyor
Flue Gas Treatment with SCR or SNCR

Single Heat

Sizes: 30, 60, 90, 120 & 150 MWt
Fuel Lines: 1, 2, 3, 4 or 5
Steam: 110 bara, 540 °C
Slagging Pending Super Heater
Attemperators: 3

ReHeat

Sizes: 120 & 150 MWt
Fuel Lines: 4 or 5
Steam: 140 bara, 540 °C, 540 °C
Slagging Pending Super Heater
Slagging Pending Re Heater
Attemperators: 3+1

2 PASS BOILER SH & RH

Forest Biomass Residue Low Alkaline.
Base: Wood Chips, Wood Pellets...

Supplement: Wood Chips, Wood Pellets...
Fuel: 100% Base.
Type: Two Pass Boiler Design.
Water Cooled Vibration Grate.
Spreader Stoker.
Combustion Air PreHeating.
Primary Air PreHeating FW.
Submerged Bottom Ash Conveyor.
Flue Gas Treatment with SCR or SNCR

Single Heat

Sizes: 20, 30, 45, 60, 75, 90, 105, 120, 135 & 150 MWt
Fuel Lines: 2, 3, 4, 5, 6, 7, 8, 9 & 10
Steam: 110 bara, 540 °C
Slagging Pending Super Heater or Empty First Pass
Attemperators: 3

ReHeat

Sizes: 75, 90, 105, 120, 135 & 150 MWt
Fuel Lines: 5, 6, 7, 8, 9 & 10
Slagging Pending Super Heater
Slagging Pending Re Heater
Attemperators: 3+1
Steam: 140 bara, 540 °C, 540 °

3 PASS BOILER SH

Waste A1/A2/A3/RDF/MSW Low Alkaline.
Base: Waste Wood Chips, Refuse Derived Fuel, Municipal Solid Waste.

Fuel: 100% Base
Type: Three Pass Boiler Design
Water Water Cooled Vibration Grate or Water Cooled Step Grate
Furnace Inconel Lining
Spreader Stoker or Hydraulic Pushers
Combustion Air PreHeating
Primary Air PreHeating FW
Submerged Bottom Ash Conveyor
Flue Gas Treatment with SCR or SNCR
WI T2S Compliant

Single Heat

Sizes: 20, 30, 45, 60, 75, 90, 105, 120, 135 & 150 MWt
Fuel Lines: 2, 3, 4, 5, 6, 7, 8, 9 & 10
Steam: 110 bara, 470 °C
Attemperators: 2

2 PASS BOILER SH

Industrial Biomass Residue Low Alkaline.
Base: Wood Dust, Sunflower Husk, Meat & Bone Meal...

Fuel: 100% Base
Type: Two Pass Boiler Design
Cyclonic Combustion Chamber
Pneumatic Fuel Injection
Combustion Air PreHeating
Water Cooled Bottom Ash Conveyor
Flue Gas Treatment with SCR or SNCR

Single Heat

Sizes: 20, 40, 60 & 80 MWt
Fuel Lines: 1 & 2
Steam: 100 bara, 450 °C
Attemperators: 2

Combustion System

1. Water-Cooled Vibrating Grate:

The Water-Cooled Vibrating Grate (WCVG) is a proprietary BWE design, available in sizes from 30 to 150 MWt. The design can be adapted to customer requirements and optimized for specific fuels such as wheat straw, rice straw, corn stover, mustard husk, palm leaves, sugarcane bagasse, wood chips and more. Specific fuel feeding systems are adapted according to the type of fuel used.

The WCVG is an integrated part of the evaporator. Primary air is introduced below the grate, representing 30% of the combustion air. The remaining 70% is introduced as ignition air, secondary air and overfire air, allowing staged combustion for superior control of NOx formation. The WCVG offers high availability and low maintenance costs.

2. Cyclonic Combustion Chamber:

The Cyclonic Combustion Chamber (CCC) is a proprietary BWE design, available in sizes from 10 to 40 MWt. The design can be adapted to customer requirements and optimized for fine fuels such as sawdust, sunflower husk and meat and bone meal.

The horizontally oriented, water-cooled Cyclonic Combustion Chamber is an integral part of the evaporator. The fuel is pneumatically transported to the combustion chamber and enters tangentially. Air nozzles generate cyclonic movement within the combustion chamber, improving residence time, turbulence, temperature distribution and combustion efficiency. The CCC offers high availability and low maintenance costs.

3. Multi-Fuel Burner:

The Multi-Fuel Burner (MFB) is a proprietary BWE design, available in sizes from 15 MWt to 100 MWt. The design can be adapted to customer requirements, including fuel flexibility, staged air combustion and adjustable swirl.

The Multi-Fuel Burner can be designed for natural gas, heavy fuel oil, light fuel oil, coal dust or wood dust. All fuels can be used in a single unit with automated transition. Fuels are individually controlled to obtain optimal flame shape, stability and temperature, as well as ultra-low NOx and CO formation. Staged air combustion is key and involves stratification of primary, secondary and tertiary air, over burner air (OBA) and overfire air (OFA). This applies to all boilers, burner configurations and combustion air designs.

4. Step-Grate:

The Step-Grate system is a robust and proven solution for the thermal conversion of challenging solid fuels, including refuse-derived fuel (RDF), solid recovered fuel (SRF), municipal solid waste (MSW), waste wood (A1/A2/A3), and other mixed waste fuels. The technology is designed to ensure stable combustion, high availability, and excellent fuel flexibility, and is available in thermal capacities ranging from 20 to 60 MWt.

The grate consists of a series of stepped, moving rows made of durable cast elements that gradually convey the fuel through distinct combustion zones. Depending on fuel characteristics and plant requirements, the system can be configured with either air-cooled or water-cooled grates, ensuring reliable operation and long service life under demanding conditions.

Bale Handling System

1. Warehouse Management System

BWE offers a complete automated fuel handling system for baled fuel, from reception in the warehouse to feeding the boiler. Warehouse Management is key and consists of a Supplier & Supply Identification Station (SSID), a SQL Database, and a Warehouse Management Software. The SSID registers the supplier and stores the data in the SQL Database.

The roof crane lifts a supply of 12 bales directly from the truck (fully automatic) or from the floor (semi-automatic) and places them in the warehouse at a specified position provided by the Warehouse Management Software. The crane measures the weight and moisture content of the bales during lifting and links the data to the supplier already registered in the SQL Database. The Warehouse Management System (WMS) also ensures that the reception conveyor is continuously replenished.

2. Bale Conveyor System

BWE offers a complete automated Bale Conveyor System for baled fuel, from reception in the warehouse to feeding the boiler. The first component in the automated line is the Reception Conveyor. The Reception Conveyor holds 12, 24, or 36 bales in waiting, depending on plant size. A Transfer Conveyor receives two bales and delivers them one by one to the feeding line requesting fuel.

A Weighing Conveyor measures the weight and moisture content of each individual bale, which is required for boiler operation. Next, the bales enter the Air Lock Conveyor, followed by two Buffer Conveyors. The String Cutter Conveyor then cuts the twines, followed by the Dosing Conveyor, which pushes the bales towards the Bale Opener, loosening the bales. From the Bale Opener, the fuel and twines drop into the Double Screw Stoker.