Potential Applications of High Temperature Air Combustion Technology to Other Systems - High Temperature Air Combustion: From Energy Conservation to Pollution Reduction - page 346

Syngas High Temperature

Air

Solid Waste

Waste Material

Fixed grate

Syngas

Slag

High Temperature
Air

FIGURE 6.3 A schematic diagram of twin chamber “bed type” g asifier.

FIGURE 6.4 A schematic diagram of industrial g as turbine and furnace.

produced; see Figure 6.6 . Of course, this is an ideal representation for a plant with

the aim to stimulate and challenge engineers on the design of future facilities.
Much of what has been discussed so far involves the transformation of waste to
syngas chemical energy in only one stage in the bed. A gasifying agent can be used
to improve the calorific value of the gas produced. One such agent includes steam
but another suitable gas can also be used. A schematic diagram of the steam-assisted
gasification system is shown in Figure 6.7 . The objective of the gasifying material
is to further enhance the conversion of carbon in the waste (fuel) to syngas fuel.
The syngas evolved can also be used for power generation, using, for example, high
temperature air principles in micro gas turbines. Typical mole fraction of the steam
in air in Figure 6.7 would be 10 to 20%, depending on the properties of the fuel.