IET’s Waste Gasification / Thermal Oxidation (WG/TO) system is an environmentally
safe process for the destruction of solid waste. This is achieved as a two-stage
The first stage is called the Primary. In this stage, waste is loaded directly into
the primary cells without need for preprocessing or sorting of any kind. When the
cell is full, the load doors are closed and the process started. A supplemental fuel
burner is used to heat the primary cell to a temperature of about 450°F. At this
time, the burner can be shut off and the temperature is controlled by opening or
closing an air-inlet valve, typically maintaining temperatures between 700 and 1,000°F.
The primary operates as a sub-stochiometric process, maintaining oxygen levels in
the primary at a point that is too low for open combustion. This environment promotes
the conversion of the solids into a gas. This gas is a low-Btu mixture primarily
made up of carbon monoxide and volatile organic compounds.
The gas from the primary is vented into a secondary chamber, commonly called the
Secondary. Here, the gas passes through a specially designed air ring that brings
the oxygen levels back up to a point that makes the gases combustible. This gas is
then ignited by the secondary burners. The gas burns to complete combustion, eliminating
all of the CO and volatile organic compounds. The resulting temperature is typically
in the range of 1,600 to 2,000°F.
The resulting hot air from the secondary can then be vented through a waste heat
boiler to produce steam. This steam is then routed through a steam turbine to produce
electrical power. From a typical 100 ton per day system, enough gas is produced to
generate 3.0 MW of electrical power, with a possibility of up to 5 mw with additions
of high btu waste such as tires etc.
As system sizes get larger, the efficiency of boilers and turbines increase and the
per-ton power production may increase.
Power Production from Waste Gasification / Thermal Oxidation
IET technology is more than just the cleanest and most cost effective way to dispose
of waste. The IET process can also transform waste into energy as well as other valuable