The products from our power plants are a result of the following processes and include:
- Recycled metals
- Glass building materials or aggregates for road construction
Combined cycle power generation
The traditional approach to the thermal production of electric energy has been to combust the fuel in a boiler to produce
steam which is then passed to a turbogenerator. The Combined Cycle approach involves the combustion of the fuel in an
internal combustion machine such as an Otto cycle piston device or a gas turbine.
The hot exhaust gas exiting from the internal combustion stage then is passed through a Heat Recovery Steam Generator
(HRSG) to produce steam which is sent to a steam turbine to produce additional electric energy. As a result of the two
stage approach, greater efficiency of conversion of the heat value of the fuel into electric energy than is possible with the
simple use of the steam cycle.
This is the process of melting the resulting ash so as to achieve physical properties similar to obsidian or other natural
glass. Occasionally it is necessary to add certain low cost materials to optimize the chemical composition.
Most of the glass that is produced is of the soda-lime-silica type that is normally made from a mixture of sand, soda ash
and carbonates of calcium and/or magnesium.
The combination of bottom and fly ash along with the Air Pollution Control (APC) gatherings usually have an average
composition which can make a good glass. If required, the composition can be benefited by the addition of low cost
materials such as sand or limestone. As a result, the material produced is useful for the making of building materials. The
means to take a good molten glass and produce specific shapes is well worked out and available off the shelf.
The gasification process creates a Synthesis Gas (Syngas) in the gasifiers which then passes to the cleaning stage where
sulfur, chlorine, heavy metals and other harmful species will be removed. The clean syngas then passes to the first stage
of the combined cycle power generation where it is combusted to drive a gas turbo-alternator. The gas emerging from the
gas turbine then enter a Heat Recovery Steam Generator where steam is made. The steam then goes to a steam turbo-
alternator to produce additional power.
The gas exiting the HRSG then passes to a cleaning stage where any remaining pollutants are removed prior to its release
to the environment. The melted inorganic fraction (slag) exiting the gasifier is quenched in water and conveyed to a bunker
it is removed and transported to the concrete block manufacturing area to be used as aggregate.
The sludge from the cleaning of the syngas and the gathering from the final stage of gas cleaning after the HRSG are sent to
the blending area where they become part of the infeed to the gasifiers ultimately becoming part of the slag.
The slag and cleaned and sized inorganics are sent to the concrete block manufacturing area where they are mixed with
Portland cement to form high quality standard 190x190/390 mm construction blocks.
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