1 Fuel In-Feed System The metering bin provides short-term fuel
storage and ensures a constant supply of fuel to the gasifier.
Fuel is conveyed by a horizontal auger from the metering bin to
a vertical auger that pushes fuel into the base of the fuel pile
inside the gasifier. Within the gasifier, the fuel moves through
progressive stages of drying, pyrolysis, gasification and
reduction to ash. Combustion air (20 - 30% of stoichiometric),
steam and/or oxygen are introduced through the inner and outer
cone into the base of the fuel pile. Partial oxidation,
pyrolysis and gasification occur at 1500 — 1800 °F (815 – 980
°C), and the fuel is converted into “syngas” and non-combustible
ash. Combustion temperatures in the fuel pile are tightly
controlled and kept below the ash melting temperatures to ensure
that there is no formation of “clinker” and that the ash flows
freely. 3 Automatic Ash Removal System As the fuel is processed
in the system it is reduced to non-combustible ash. The ash
migrates to the grate at t