(86c) Development of Novel Reducing Agents for NOx Reduction by Sncr Method

Nitric oxides (NO_x), mainly including nitric oxide (NO) and nitrogen dioxide (NO₂), are of the most toxic pollutants formed during combustion and refining processes. Post-combustion treatment methods include selective catalytic reduction (SCR), selective noncatalytic reduction (SNCR), reburning, and the combination of these aftertreatment technologies. Among the post-combustion technologies, the SNCR technology is considered to be an effective approach to reduce NO_x, with reasonable capital investment and operation cost. To reduce NO_x in a lean environment, a reductant is needed. For SNCR, the most commonly used reductant is ammonia or urea water solution as an alternative to NH₃. One of the disadvantages of ammonia is the cost of the injection system. Different reducing agents for NOx removal by SNCR method will be evaluated in this paper, including carbon monoxide, hydrogen, char, hydrocarbons, and oxygenates, etc.