Sulfur Dioxide Removal From Stack Gases

Flue Gas Desulfurization (FGD) systems will be increasingly applied to industrial boilers because of the increasing use of sulfur-bearing coals and the adoption of stricter SO2 emission regulations by federal and state agencies.

An evaluation is made of the technology, economics, and commercial status of FGD systems for industrial boilers at a capacity of 100 megawatts cogenerating electricity and steam for an industrial complex. Four commercially applied FGD processes are evaluated, namely, two "throwaway" procedures producing a disposable gypsum waste and two regenerable procedures reducing SO2 to salable elemental sulfur. The processes are respectively:

• Limestone/Lime
• Double Alkali
• Citrate
• Wellman-Lord.

Other promising developmental processes with potential commercial application are also described. A summary of existing governmental regulations on SO2 emission control and proposed modifications is presented. A general review of boiler NOx control processes is presented reflecting the intense interest in Japan and the United States in abating NOx pollution.

Other PEP Related Reports:

• Sulfur Dioxide Removal From Stack Gases 63
• Sulfur Dioxide Removal From Stack Gases 63A
• Sulfur Dioxide Removal From Flue Gases 63C