Technical Data Biomass Boiler Capacity

Biomass Boilers for process steam production
Thermal capacity – from  7 MW up to 70 MW
Max. working pressure – 22 bar
Temperature – up to 200 С

Biomass Boilers for electricity production (co-generation)
Thermal capacity – from 9 MW up to 75 MW
Max. working pressure – 58 bar
Temperature – up to 450 С

Hot water boilers
Thermal capacity – from 3 MW up to 10 MW
Max. working pressure  – 14 bar

Advantages of Biomass Boiler:

1. Furnace design specifically for firing biomass fuels.  Not a redesign of a fossil-fuel fired furnace.
2. Better combustion, lower emissions, ability to burn wetter fuels successfully.
3. Lower carry-over of particulate matter due to better furnace control.
4. Biomass boilers meet or exceed the requirements for emissions of particulate, SO2, NOx, and CO as stipulated by Lithuanian and Latvian authorities.
5. Biomass boilers have generous volume, which means that moisture-laden gases pass through the biomass boiler more slowly, reducing erosion.
6. Proprietary designs, superior manufacturing capabilities, and a full engineering staff give us flexibility to take on many types of projects.
7. Over 300 successful energy system projects, worldwide.

Sohrt description of Biomass Boiler: 

1. The portion of the biomass boiler which sits directly above the furnace cells constitutes the radiant section of the biomass boiler. Combustion of the volatile gasses produced by the furnace cells is completed in this zone, radiating energy to the biomass boiler waterwalls, roof section, screen tubes, and superheater section, what allows to burn wood fuel with high moisture content (50-62%)
2. Combustion air is introduced into the furnace cell in three separately controlled zones; undergrate air, overfire air, and tertiary air. The undergrate air is introduced through the grates through linear controlled dampers at low pressure.  The overfire and tertiary air is independently controlled with linear dampers, and is first directed around the outer periphery of the cell where it absorbs heat from the refractory while simultaneously cooling the cell, then through multiple tuyere holes. The tuyere holes are formed tangentially in the cell refractory, creating a cyclonic action. The undergrate air is used for gasification of the wood-fuels.  The volatile gasses are then ignited in the zone directly above the fuel pile, and combustion is completed in the upper portion of the furnace cell and the biomass boiler water-wall combustion chamber.  This staged combustion process and the manner in which the air is introduced into the furnace cell contributes to low carry-over and reduced emissions, increase biomass boiler efficiency.
3. The biomass boiler system is controlled with a computerized control system developed and serviced by software engineers. The superheater temperature is controlled with an attemperation coil in the mud-drum, through which a portion of the steam is diverted to maintain precise temperature at the outlet of the superheater. The system is based on a Hewlett-Packard computer, with accompanying peripherals and proprietary software. Computerized control systems are simple to operate and maintain, are password protected, and have excellent historical data storage and retrieval.
4. Fuel supply to the furnace system is designed in such way that air inlow from transportation system to the furnace is almost oimpossible – all feeding and transmisssion scerews are in closed jackets. Clearances between jackets and screws caculated in such way, that it would be always filled with the fuel during biomass boiler operation.
5. High fuel combustion efficiency and installation of reliable flue gases cleaning equipment secure low emissions level.
6. The water-cooled rotary grate system is comprised of pairs of water-cooled rotating tubes with intermeshing teeth welded to the outer periphery of each roll.  The rolls index in a ratcheting manner creating a grinding effect on the ash.  The teeth are spaced at intervals allowing for the knobbed surfaces to pass by each other and to also provide space for passage of undergrate combustion air.  The hydraulically operated rolls are assembled in pairs, tied together to rotate in opposite directions.  At timed intervals, each pair of rolls rotate, crushing the ash between them, and dropping it to a conveyor below.  Should an overload condition occur, the pair of tubes suffering the overload may be reversed.
7. High quality and reliability of boler system, it’s maitenance and repair costs are very small.
8. It is possible to supply separately biomass boiler or full biomass boiler system completed with all reuired equipment and accessories, also with steam turbine for electricity generation.