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Landfill Gas A Solution To Rising Natural Gas Prices
Rising natural gas and fuel oil prices have users of all kinds looking for cost-effective
alternatives. One viable and popular substitute is the use of landfill gas, and
companies are successfully implementing landfill gas (LFG) product conversions
to existing oil and/or natural gas fired boilers. Hamworthy Peabody Combustion
has an extensive track record in the application and combustion of non-standard
gases and recently completed two turnkey landfill gas conversion projects for
a major U.S. automaker. The projects were completed within the plant outage and
LFG availability schedule, and the boilers have been successfully commissioned
on both LFG and natural gas. Both projects have been in service for an extended
period with no operational or availability issues. The Company has just completed
a third turnkey project for the same auto manufacturer.
In addition to modifying an existing burner for one of the three projects,
Hamworthy Peabody supplied new vertically up fired burners to burn LFG for
this automaker's
other two projects, as well as supplied a new PLC based burner management
system, new LFG piping from LFG supplier's flange and combustion control modifications
to fire landfill gas. Hamworthy Peabody's scope included the mechanical and
electrical
installation, as well as unit commissioning.
Each of the three projects involved the application of landfill gas to an
existing watertube boiler. To maximize LFG usage, the boiler combustion
control system
was designed so all available LFG was burned and any additional heat input
required was provided by the co-firing of natural gas. In addition, the
control system
was fully metered to measure both air and fuel flow to assure proper and
safe fuel/air ratios. During initial design and operational review with
the Customer,
it was noted that boiler availability was critical. As a result, Hamworthy
Peabody Combustion designed this specific system to provide a constant
natural gas pilot
to assure stability and a constant source of flame, should there be an
upset at the landfill. This constant natural gas pilot would negate the requirement
for a boiler repurge should the landfill gas supply become interrupted.
If
the LFG supply were interrupted, the combustion control system would automatically
start or increase the main natural gas burner to maintain steam production.
For further inquiries please contact Larry Berry at 203-922-1199 or email:
lberry@hamworthy-peabody.com.
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