Hybrid system combined SNCR plus SCR technologies for post-combustion NO{sub x} reduction

Conference · Wed Jul 01 04:00:00 EDT 1998

OSTI ID:20018944

Carli, A; Heide, B von der

Among the numerous processes and technologies available for post-combustion NO{sub x} control, the two most commonly known are Selective Non-Catalytic Reduction (SNCR) and Selective Catalytic Reduction (SCR). SNCR involves injection of urea or ammonia based reagents in the high temperature zone of a boiler where the thermal decomposition results in the reduction of NO{sub x}, while SCR selectively reduces NO{sub x} in the presence of a catalyst at a substantially lower temperature. The paper discusses a novel approach to combine both SNCR and SCR techniques resulting in an economical and effective technology for NO{sub x} reduction. In fact while these post-combustion technologies have been used individually, there are merits to combining the technologies into a staged concept that utilizes both SNCR and SCR, in order to eliminate or reduce the limitations of each. In that approach the SCR is represented by two different types of catalyst: In-Duct or stationary catalyst (IDSCR), and the catalyzed hot end portion of an Air Heater (AHSCR).

• Research Organization: Hamon Cifa Progetti (IT)
• OSTI ID: 20018944
• Report Number(s): CONF-9806214--
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
AMMONIA
HYBRID SYSTEMS
POLLUTION CONTROL EQUIPMENT
REAGENTS
SELECTIVE CATALYTIC REDUCTION
UREA