Co-firing (Co-combustion) of the agriculture wastes, corn
and grains with coal.
Several benefits were detected favouring the extensive use
of biomass in energy production together with coal. Combustion
of high Si-content biomass residues alone produced Cl-containing
deposits, which tend to be corrosive. Sulphur and aluminium
silicates, present in coal, peat and lignite, inhibited
Cl deposition. Even small addition of coal to the feedstock
hindered Cl deposition. As a synergetic effect, wood derived
biomass strengthened SO2 capture from the flue gases of
coal combustion. In short, co-combustion of biomass and
fossil fuels has been argued for the following reasons:
__ SO2 and NOx emissions reduced by
use of biomass fuels (in comparison with fossil fuels
alone). Co-combustion also reduces the net CO2 emissions
__ compensation of the seasonal fluctuations of the biomass
availability by the fuel mixture
__ eventual higher cost of biomass fuels compensated by
fuel mixture.
Co-firing is also a technique that prevent bed agglomeration
and fouling in FBC units. Indeed, the risk of bed agglomeration,
linked to increased amounts of alkaline metals (Na, K) is
strongly reduced when peat is added.
http://www.et.byu.edu/~larryb/Cofire.htm
http://en.wikipedia.org/wiki/Cofiring
http://www.netbiocof.net/
http://www.biomassenergycentre.org.uk/portal/page?_pageid=75,41175&_dad=portal&_schema=PORTAL
