overfire air

overfire air

Secondary air which is introduced in a furnace above the grate to complete combustion and to produce turbulence, thereby increasing the efficiency of the combustion process.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Evaluation of staged air and overfire air in regulating air-staging conditions within a large-scale down-fired furnace, Applied Thermal Engineering: 97-105.
Electrostatic precipitators (ESP) particulate matters (PM), Flue Gas Desulphurization (FGD) to control Sox and Low Nox burners with overfire Air Ports and selective Catalytic Reduction (SCR) system.
The company's nitrogen oxide (NOx) reduction technologies include advanced combustion modification techniques -- such as low NOx burners and overfire air systems -- and post-combustion NOx control approaches, including NOxOUT and HERT(TM) SNCR systems, as well as systems that incorporate NOxOUT CASCADE, NOxOUT ULTRA, Rich Reagent Injection (RRI) and NOxOUT-SCR processes.
Vierstra, "Use of CFD Modeling to Guide Design and Implementation of Overfire Air for NOx Control in Coal-Fired Boilers," Proceedings of Nineteenth Annual International, Pittsburgh Coal Conference, Pittsburgh, PA, U.S.A.
(269) Controls used to prevent N[O.sub.x] formation during combustion include low-N[O.sub.x] burners (LNBs), reburning, overfire air (OFA), flue gas recirculation (FGR), and modifications to the "three T's." (270) Selective catalytic reduction (SCR) and selective noncatalytic reduction (SNCR) are forms of post-combustion controls.
(287) The final rule included "overfire air" as low-N[O.sub.x] burner technology.
Products include fuel atomizers, aerodynamic flame stabilizers and overfire air systems, as well as modeling and support services for non-catalytic and catalytic NOx reduction systems for boilers and process heaters.
The burner section was modified to slurry coal clinker burning zone that facilitates optimization of the lower and upper overfire air windbox.
Analysis discovered over 50 control rules (27 for low emissions) with key operating variables governing the NOx emissions identified as percentage of excess air, windbox/furnace pressure drop, percentage of open auxiliary air, percentage of open lower and upper overfire air, and percentage of fuel air.
into the boiler through four rows of overfire air ports, two on the front
overfire air. Technicians at the boiler site tried changing the airflow
Combustion air is introduced as either undergrate air (UGA) or overfire air (OFA).