scope:

The application of this Code is limited to the process and equipment employed to remove sulfur dioxides from flue gas or other sulfur-dioxide-laden gas streams. The methodology described in this Code may be adapted for assessment of removal of other emissions if agreed to by the parties to the test. The performance of an FGD system is defined to be the characterization of inputs and outputs (see Figure 1-2-1).

This Code does not apply to removal of sulfur oxides from gases during the combustion process, e.g., fluidized bed combustion (see ASME PTC 4).

This Code covers the following types of systems:

(a) Dry FGD System. An FGD system process in which a flue gas containing sulfur oxides passes through an alkaline material but is not saturated with moisture; the gas leaves the reactor at a temperature above the adiabatic saturation, thus producing a dry by-product or dry waste product.

(b) Wet FGD System. An FGD system process in which a flue gas containing sulfur oxides passes through an alkaline material and is saturated with moisture, thus producing a wet by-product or wet waste product.

(c) Regenerable FGD System. An FGD system process that regenerates and recycles the sorption medium.

This Code does not cover in detail other FGD system processes such as dry sorbent injections, seawater, and ammonia; however, the principles are still applicable.