Oxygen-enriched combustion in supercritical steam boilers

Deep-staged, oxygen enriched combustion of coal

“…This technology may be considered as a retrofit option for existing plants and may help to alleviate CO 2 emissions while new build oxy-coal plants are introduced. Earlier findings on the use of OEC have demonstrated a significant increase in the production rate of the process (15-30% commonly achieved in the glass industry, 5-34% in the ferrous metal industry and 65% in aluminum rotary furnaces) and in fuel efficiency (10-30% for typical regenerative glass furnaces and 28.4% fuel (gas) savings in aluminum rotary furnaces) [5][6][7][8][9]. At the same time, the overall emissions can be reduced compared to simple air-firing conditions depending upon the oxygen injection method, for example oxygen enriched air staged (OEAS) technique when applied to regenerative glass furnaces was able to reduce NO x emissions by between 30% and 70% [12].…”

“…These benefits over conventional air-fired combustion have been demonstrated in a variety of high temperature industrial combustion applications such as glass melting, cement kilns and steel reheating furnaces. OEC has significantly increased thermal efficiency, reduced pollutant emissions and fuel consumption, and improved flame stability in the aforementioned industrial sectors) [5][6][7][8][9]. Coupling of OEC and CO 2 capture by membrane processes is an innovative approach towards low cost carbon capture and storage technologies [10,11].…”

Effects of flue gas recirculation on the premixed oxy-methane flames in atmospheric condition

“…Theoretically, it enables to produce highly concentrated carbon dioxide flue gas through the water condensing treatment, and it has the potentials in reutilization and sequestration of carbon dioxide. Nowadays, to retrofit the traditional fossil fuel fired power plant for oxy-combustion has been considered one of the cost-effective and feasible implements [3,4] to promote this technology in industries.…”

NOx control in coal combustion by combining biomass co-firing, oxygen enrichment and SNCR

“…It was found that below 1000 o C, higher NO reduction was reported for higher O 2 concentration due to formation of more radicals to drive the sustained chain reactions by increasing the rate of H + O 2  OH + O and O + H 2 O  OH + OH reactions [14]. However, there is a need to do more investigations especially on the effect of O 2 enrichment on the performance of SNCR process for coal-biomass co-fired pulverised combustors due to limited available published literature on such hybrid configurations.Moreover, it is believed that if the biomass-coal co-fired power generation units are equipped with retrofit able oxygen enhanced combustion (OEC) and SNCR processes, the results can easily far outweigh the benefits of SCR with better carbon burnouts, plant efficiencies and emission levels [10][11][15][16][17][18][19][20]. …”

“…Moreover, it is believed that if the biomass-coal co-fired power generation units are equipped with retrofit able oxygen enhanced combustion (OEC) and SNCR processes, the results can easily far outweigh the benefits of SCR with better carbon burnouts, plant efficiencies and emission levels [10][11][15][16][17][18][19][20].…”