15 Outotec SEAP Customer eNewsletter 2/2016
ENERGY SYSTEMS FOR REFUSE-DERIVED
AND SOLID-RECOVERED FUELS
Our bubbling fluidized bed and advanced
staged gasification technologies
are ideally suited to challenging
fuel sources due to their superior
operating characteristics and emissions
performance
Outotec’s unique solution for thermal oxidation of
recovered fuels combines in-vessel heat transfer tubes
with a proprietary bed material recycling system, ensuring
reliable operation with heterogeneous fuels such as
refuse-derived fuel (RDF) and solid-recovered fuel (SRF).
All our energy systems are designed to meet the stringent
air emissions requirements defined in plant operating
permits. Our energy systems have a proven track record
at installations around the world.
Processed fuel is delivered to a dual-screw metering
bin located adjacent to and elevated above the fluidizedbed combustor or gasifier. Upon discharge from the bin,
the metered fuel is gravity-fed to an air-swept spreader
inlet. Pulsating sweep air disperses the fuel across the
combustor span.
CHALLENGES
SOLUTION
BENEFITS
•
•
•
•
•
Variable quality fuels with
high inert material content
High plant operating
efficiency requirements,
particularly for boilers
Strict plant emissions
limits
•
•
Outotec Bubbling Fluidized
Bed (BFB) combustion or
gasification vessel
In-vessel tubes for highly
efficient heat transfer
Outotec Bed Material
Recycling System
•
•
Stable, efficient operation
with varying fuel quality
Bed cleaning and recycling
system ensures removal
of high volumes of inert
material
Conditions optimized for
inherently low NOX production and emissions abatement
Outotec SEAP Customer eNewsletter 2/2016 16
Due to the lower furnace temperature, the Outotec Advanced Staged Gasifier is especially
suitable for challenging fuels like RDF, which has a low ash-softening temperature
After releasing its moisture, the fuel oxidizes at a low,
controlled temperature, which helps prevent ash from the
fuel from melting and coating the boiler tubes. Limestone
is also added to the bed in order to improve ash eutectics
and capture sulfur oxides (SOx).
Any remaining inert fuel contaminants such as metal
or rock are automatically removed from the bed
during normal operation by the Outotec Bed Material
Recycling System.
Flue gas cleanup is typically carried out by injecting
dry sorbent into the flue gas, which then enters a
pulse-jet fabric filter baghouse. This removes 99% of
the remaining particulate matter.
Nitrogen oxide (NOx) abatement takes place inside the
main vessel’s upper vapor space, where nozzles spray
ammonia into the 927°C (1700°F) flue gas, which then
reacts with nitrogen oxides to form nitrogen, carbon
dioxide, and water.
Fuel
NH4(OH)
Steam
Emissions are monitored via a continuous emissionsmonitoring system, which measures carbon
monoxide, oxygen, NOx, and acid gases.
Ca(OH)2,
activated carbon
Economizer
Metering
bin
Air
Baghouse
Multiclone
Boiler
Advanced
staged
gasifier
Stack
Air
Ash pickup
Ash pickup
Tramp hopper
The Outotec fluidized bed system process.
SELECTED REFERENCES
12.5 MWE ADVANCED STAGED GASIFICATION
POWER PLANT FIRING RDF, LEVENSEAT, UK
Outotec has been contracted by M&W High Tech Projects
UK Limited to deliver the technology for a new wasteto-energy plant to be built near Lanark in Scotland, for
Levenseat Renewable Energy Limited. In addition, Outotec
has signed a 12-year operation and maintenance contract
with the plant operator.
Scope of supply
The scope covers the engineering and delivery of the
main process equipment for the plant, which is based on
Outotec Advanced Staged Gasification technology. Outotec
experts will be on site during the construction and
commissioning phases.
PLANT FACTS
Fuel
RDF consumption
≈ 300 t/day (27,630 lb/h)
Steam parameters
Flow
54.6 t/h (120,000 lb/hr)
Temperature
400°C (752°F)
Pressure
46 bar (667 psi)
Completion
2017
17 Outotec SEAP Customer eNewsletter 2/2016
SELECTED REFERENCES
10 MWE FLUIDIZED BED POWER PLANT FIRING
RDF, BERGAMO, ITALY
The Bergamo facility receives municipal and industrial
waste, processes it to remove the recyclable and noncombustible fraction, and sizes the balance for conversion
to energy in the Outotec Fluidized Bed System.
Scope of supply
Outotec supplied the fluidized bed thermal oxidation,
NOx abatement, bed additive, and bed material recycling
systems, the process design for the entire boiler island,
as well as advisory services during the construction and
commissioning phases.
PLANT FACTS
Fuel
RDF consumption
≈ 185 t/day (17,000 lb/h)
Steam parameters
Flow
49.4 t/h (109,000 lb/h)
Temperature
400°C (752°F)
Pressure
46 bar (667 psi)
Completion
2002
12 MWE FLUIDIZED BED POWER PLANT FIRING
RDF, MASSAFRA, ITALY
The Appea Energy facility receives municipal waste from
the community of Massafra, processes it to remove the
recyclable and non-combustible fraction, and then sizes
the balance for conversion to energy in the Outotec
Fluidized Bed System.
Scope of supply
Outotec supplied the fluidized bed thermal oxidation,
NOx abatement, bed additive, and bed material recycling
systems, the process design for the entire boiler island,
as well as advisory services during the construction and
commissioning phases.
PLANT FACTS
Fuel
RDF consumption
≈ 300 t/day (27,630 lb/h)
Steam parameters
Flow
60.5 t/h (133,400 lb/h)
Temperature
400°C (752°F)
Pressure
46 bar (667 psi)
Completion
2003
6.5 MWE FLUIDIZED BED POWER PLANT FIRING
RDF, RAVENNA, ITALY
The facility receives the municipal and industrial waste
from the city of Ravenna, processes it to remove the
recyclable and non-combustible fraction, and sizes the
balance for conversion to energy in the Outotec Fluidized
Bed System.
Scope of supply
Outotec supplied the fluidized bed thermal oxidation, NOx
abatement, bed additive, and bed recycling and storage
systems, the process design for the entire boiler island,
as well as advisory services during the construction and
commissioning phases.
PLANT FACTS
Fuel
RDF consumption
≈ 144 t/day (13,250 lb/h)
Steam parameters
Flow
33.24 t/h (73,275 lb/h)
Temperature
380°C (716°F)
Pressure
41 bar (595 psi)
Completion
1999
FOR FURTHER INFORMATION PLEASE CONTACT:
[email protected]