Combustion Control

Several process modifications can reduce NOx formation. Table 5.19.1 summarizes the commercially available NOx control technologies as well as their relative efficiencies, advantages and disadvantages, applicability, and impacts.

The simplest combustion control technology is the low-excess-air (LEA) operation. This technology reduces the excess air level to the point of some constraint, such as carbon monoxide formation, flame length, flame stability, and smoke. Unfortunately, the LEA operation only moderately reduces NOx.

Off-Stoichiometric Combustion (OSC)

OSC, or staged combustion, combusts fuel in two or more stages. The primary flame zone is fuel-rich, and the secondary zones are fuel-lean. This combustion is achieved through the following techniques. These techniques are generally applicable only to large, multiple-burner, combustion devices.

© TABLE 5.19.1 SCREENING POTENTIAL NOX CONTROL TECHNOLOGIES

Technique

Description

Advantages

Disadvantages

Impacts To Consider

Applicability

NOx Reduction

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