Energy from Biomass
From Biomass Plants
Fuel:
Fuel:
Matured wood, waste wood, fresh wood, forest waste, tree prunings, peat, bark, other bio-fuels such as e.g. rice husks, olive pressing residues, etc.
Performance:
Steam parameters
Pusher type grate system up to 115 t/h – 525°C – 100 bar
Travelling grate system up 160 t/h - 525°C - 100 bar
Fluidised bed firing up to 115 t/h - 525°C - 100 bar
Dust burner up to 60 t/h - 525°C - 100 bar
Boiler Technology:
Multi-pass steam generator with natural circulation in vertical construction. The first boiler passes are radiation passes, the following passes are equipped with superheater, evaporator and economiser bundles. All convective heating surfaces can be cleaned by soot blowers during operation. The steam temperature is controlled by injection coolers between the superheater sections.
Combustion system:
Pusher type grate system
Fuel-loading is done by a feeding ram under the fuel feeding chute. The primary air is introduced under the grate system. The different air zones can be controlled independently from each other. The nozzles for the secondary air injection are located at the front and rear boiler walls above the combustion chamber.
Travelling grate
Fuel-loading is done by a spreader stoker system. The primary air is introduced under the grate system. The different air zones can be controlled independently from each other. The nozzles for the secondary air injection are located at the front and rear boiler walls above the combustion chamber.
Fluidised bed firing
The fuel is fed through openings of the evaporator side walls of the combustion chamber into the fluidised bed. The combustion air and the recirculated flue gas is injected into the fluidised bed and into the combustion chamber at different levels as secondary and tertiary air-injection.
Dust Burner
In addition to the a.m. firing systems it is also possible to burn wood dust respectively granules via special dust bruner or injection systems. These burners resp. injection systems are installed into the side walls of the steam generator or in a seperate combustion chamber, depending on the capacity of the additional combustion system. The flue gases are mixed inside the common convective area downstream the combustion chamber. For higher capacities this system can also be designed as a mono-system for the combustion of dust only.
Flue gas treatment:
Cyclone system, bag house filter respectivly electrostatic precipitators are used for dust reduction. Following the emission requirements a flue gas conditioning system can also be foreseen in semi-dry or dry process. Calcium hydroxide Ca(OH)2, calcium oxide CaO or NaHCO3 are fed into the flue gas as additives for the absorption of the acidic gas components. As an alternative, wet processes may also be used. The removal of nitrogen from the flue gases can be performed using either an SNCR (selective non catalytic reduction) process or an SCR (selective catalytic reduction) process.
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