Flue gas recirculation. Flue gas recirculation recycles exhaust from steam generators used in the steam-assisted gravity drainage (SAGD) process just like exhaust is recycled in our cars. The technology reduces the amount of nitrogen oxides emitted into the air during the combustion of fuel and .
Effects of Flue Gas Internal Recirculation on NOx and SOx ...
Actually large enough amount of flue gas is recycled at a high recirculation ratio which promotes a complete conversion of H2S to SO 2 according to reaction R8. Similarly 3 - 4 times increase of the SOx levels in boiler which caused by recirculating flue gas before desulfurization was reported by ECN [ 28 ].
Flue gas recirculation refers to the admission of flue gases from the boiler exit back into the burner region in order to lower the combustion temperature as shown in Fig. 4.6 which in turn lowers NOx. See Table 4.2 for the effect of FGR on combustion temperature.
Effects of flue gas internal recirculation on NOx and SOx ...
The effects of flue gas recirculation ratio air preheating temperature oxygen concentration and fuel types on pollutants emission in the volumetric combustion system were investigated. According to the results it was con-cluded the higher substitution ratio of biomass in a co-firing the lower emissions of and SOx.
Flue Gas Recirculation (FGR) FGR involves recycling a portion of the combustion gases from the stack to the boiler windbox. Introducing some of the flue gas back into the combustion air can reduce peak flame temperatures. The incoming air is diluted and the oxygen concentration in the
Jan 05 2011 · -The gas recirculation system consists of two gas recirculation fans. Two 60% capacity centrifugal gas recirculation fans are provided to supply gas recirculation flow to the furnace for reheat steam temperature control. The gas recirculation fan draws flue gas from the economizer outlet flue gas duct and discharge gas to the furnace.
Effect of Flue Gas Recirculation on Reheated Steam ...
The results show that above FGR schemescan obviously improve thereheat steam temperature; with the increase of the amount of recirculating gas the rise of the reheat steam temperature increases; with the decrease of the load the influence of FGR on steam temperature increase; the scheme of extracting recirculating flue gas from the economizer outlet has little effect on the boiler efficiency which is more