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The fan discharge is mounted on the wall of an AMCA test chamber to simulate the free-inlet and free-outlet condition. The facility is a rectangular chamber which comprises flow-settling means, pressure measuring devices, nozzles and an auxiliary fan. 2.3.9 Reheat Temperature Control by a Gas Recirculation Damper. The method is
Gas recirculation is employed to balance the heat absorption after the economizer is extracted and recirculated by a gas-recirculating fan to the bottom of the furnace (recirculation) or to the top of the furnace (tempering). Although Fossil Fuel Fired Boiler Air and Gas Path - Chaplin R.A.
May 31, 2016· Even with today’s airtight boilers, though, draft control is needed – primarily due to flue gas recirculation for NOx control. Failure to maintain draft control can result in excessive NOx emissions, among other things (such as higher operating cost and lower efficiency). Damper Control. One method is to use dampers to manage volumetric
Oct 29, 2009· An improved method and system for flue gas recirculation (FGR) from the ID Fan located downstream of a scrubber (or other Air Quality Control Equipment including cyclones, baghouses, etc., hereafter “AQC equipment”) back to the scrubber (or other AQC Equipment) inlet to maintain the minimum required flue gas throughput during low-load conditions, thereby eliminating the need for a …
Jan 05, 2011· The gas recirculation fan draws flue gas from the economizer outlet flue gas duct and discharge gas to the furnace. Modulating inlet damper controls gas recirculation flow rate. The gas recirculation flow set point is derived from the reheat steam temperature control.
Apr 21, 1987· A flue gas recirculation system for fire tube boilers includes a duct connected to the boiler gas discharge stack and to a fan. Another duct couples the fan to a …
Flue Gas Recirculation Fans. Gas recirculation fans (FGR) are typically used in power plant boilers to reduce the flue gas pollution content in the gases exhausted from thermal combustion processes. Flue gas re-circulation is a highly effective technique that significantly reduces the Nitrogen oxide (NOx) emissions from burners.
A flue gas recirculation system for fire tube boilers includes a duct connected to the boiler gas discharge stack and to a fan. Another duct couples the fan to a specially designed burner in the boiler. Recirculated flue gas is injected downstream of the fuel/air mixture in the burner and cools the flame leading to substantially reduce the NO x content in the boiler stack emissions.
Jul 03, 2011· - Gas Recirculation Fan (GRF) draw gas from a point between the economizer outlet and the air heater inlet and discharge it into the bottom of the furnace outlet. - Recirculation gas introduced in the vicinity of the initial burning zone of the furnace is used for steam temperature control, while re circulated gas introduced near the furnace
Feb 18, 2015· Tim Smith from Hudson Valley Community Colleges details the entire process troubleshooting a vent damper on a gas boiler using the DOTS HVAC Troubleshooting Simulator. Learn more and start a free