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Show CETC C A N M E T E n e r g y T e c h n o l o g y C e n t re OJC02 Recycle Combustion Special Services & Facilities /~* ETC's collaborative program on flue gas recycle combustion - burning carbon-based fuels in a nitrogen-free, ^-^oxygen/carbon dioxide mixture - addresses least cost, energy-efficient ways to meet environmental requirements. The program allows industry to determine the most economic options for reducing greenhouse gas, SOxand NOx emissions and disposing of combustion products. Background Public concern over global climate change has focused on man-made emissions of greenhouse gases, particularly the amounts of carbon dioxide released during combustion of fossil fuels. Flue gas recycling offers a means of capturing the carbon dioxide produced by combustion. The technology avoids diluting the product gas with nitrogen and the need for gas separation after combustion. This is an important factor. It allows for the most economical disposal of carbon dioxide, either through sale (e.g. for use in enhanced oil recovery) or by long term subterranean or submarine storage. CETC's Flue Gas Recycle Combustion Program enables industrial clients to examine the technical factors, e.g. oxygen/carbon dioxide ratio, that will determine the most cost-effective system. Recycle C02 and/or H20 Air AIR SEPARATOR 02 v • Nitrogen from Air Separation BOILER Product -• Gas CO, Coal. Oil or Natural Gas Reject HO Flue Gas Recycle Combustion Applied to a Steam Boiler Flue Gas Recycle Applications The diagram illustrates the least complex application of flue gas recycle technology for n e w plant or retrofit situations. The technology yields better energy efficiency w h e n applied to a combined-cycle plant burning oil, natural gas or gas derived from coal gasification. In this pase a gas turbine uses C 0 2 as the primary working fluid and combustion occurs in a C 0 2 / 0 2 medium. The use of flue gas recycling combined with a molten carbonate fuel cell is an even more efficient approach to power generation. Natural gas or gas from coal gasification is oxidized at the Vertical Combustor cell anode while the spent gas is burnt in oxygen to provide a C02-rich flue gas for use at the cathode. CETC's Capability CETC's research capabilities in flue gas recycle combustion are based upon the expertise of its staff, its pilot plant facilities, state-of-the-art modelling and simulation tools, and an extensive analytical capability. C E T C tests flue gas recycle applications in its pilot facility (see schematic next page). It can be configured to simulate present or proposed equipment and a variety of fuels. Detailed studies of h o w varying the proportion and quality of flue gases affects potentially salable products and emissions can be made. Pilot Plant Features Temperatures m a y be u p to 1800°C in the 0.3 M W , (1 million B T U / h ) combustor and u p to 200°C in the fabric |
