METHOD TO GENERATE POWER IN POWER PLANT BY BURNING CARBON-CONTAINING FUEL IN SUBSTANTIALLY PURE OXYGEN, POWER PLANT TO GENERATE POWER BY BURNING CARBON-CONTAINING FUEL IN SUBSTANTIALLY PURE OXYGEN, METHOD TO MODIFY PROCESS OF POWER GENERATION BY BURNING CARBON-CONTAINING FUEL FROM FUEL BURNING IN AIR TO FUEL BURNING IN SUBSTANTIALLY PURE OXYGEN Russian patent published in 2011 - IPC F23B99/00 F23L7/00 F23J15/06 

FIELD: power engineering.

SUBSTANCE: method to generate power in a power plant by burning carbon-containing fuel in substantially pure oxygen, at the same time the method includes the following stages, at which: (a) carbon-containing fuel is supplied into a furnace; (b) substantially pure oxygen is supplied from a source of oxygen into the furnace to burn fuel in oxygen to produce waste gas, containing mainly carbon dioxide and water; (c) waste gas is released from the furnace by means of a channel for waste gas; (d) the whole amount of low-potential heat is extracted from the waste gas by usage of multiple coolers for waste gas, arranged in the downstream part of the channel for waste gas, at the same time the first part of the extracted low-potential hat is used for pre-heating of feed water; (e) the pre-heated feed water is turned into steam by extraction of high-potential heat at heat-transfer surfaces arranged in the furnace and located closer along the flow of the part of the channel for waste gas; (f) pressure of the first part of the waste gas is increased in multiple compressors for waste gas to produce liquid carbon dioxide; (g) the second part of waste gas is recirculated into the furnace by means of the channel for waste gas recirculation; (h) steam is expanded in the steam-turbine system to actuate the power generator; (i) the whole amount of steam is extracted from the steam-turbine system, and the first part of the extracted steam is used to pre-heat feed water, at the same time the first part of the extracted low-potential heat makes more than 50% of the whole amount of extracted low-potential heat, which makes it possible to minimise the first part of the extracted steam, and the method includes an additional operation: (j) the second part of the extracted steam is expanded in at least one auxiliary steam turbine for actuate at least one compressor or at least one pump of the power plant.

EFFECT: invention makes it possible to minimise costs or losses of produced power caused by removal of carbon dioxide.

14 cl, 1 dwg