Method for energy conversion minimizing oxygen consumption
AssigneeALSTOM Technology Ltd
InventorsJean-Xavier Morin, Corinne Beal
Life of this patent
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Abstract
The invention concerns a method for energy conversion of solid fuels in particular containing carbon comprising a first step which consists in reacting said fuels in a first energy conversion reactor (2, 20). The invention is characterized in that it comprises a second step which consists in injecting oxygen brought to the output of said reactor (2, 20), the reaction of the first step being carried out in at least a circulating fluidized bed (30, 31, 40) and in that the metal oxides circulate between two interconnected circulating fluidized beds (30, 31, 40) converting the fuel and oxidizing the oxides.
Claims15
A method for effecting the energy conversion of solid fuels containing carbon comprising:
- reacting the solid fuels with oxygen provided by oxide particles to create flue gases and unconverted compounds in a first oxide reduction reactor having an exit, wherein the first oxide reduction reactor includes a first circulating fluidized bed;
- providing the flue gases, oxide particles and unconverted compounds from the exit of the first oxide reduction reactor directly to an inlet duct of a gas-solid separation cyclone, the separation cyclone also having a roof, and an exit, wherein the separation cyclone rotates the flue gases, oxide particles and unconverted compounds to create increase residence time within the cyclone and to separate out the oxide particles and convey the separated oxide particles to an oxide oxidation reactor;
- injecting oxygen into the separation cyclone of the first oxide reduction reactor to convert unconverted compounds exiting the first oxide reduction reactor;
- oxidizing the oxide particles in the oxide oxidation reactor, wherein the oxide oxidation reactor includes a second circulating fluidized bed;
- and
- circulating the oxide particles between the oxide oxidation reactor and the first oxide reduction reactor for conversion of the fuel and oxidization of the oxide particles.
A method for effecting the energy conversion of solid fuels containing carbon comprising:
- reacting the solid fuels with oxygen provided by oxide particles to create flue gas and unconverted compounds in a first oxide reduction reactor having an exit, wherein the first oxide reduction reactor includes a first circulating fluidized bed;
- providing a gas-solid separation cyclone at the exit of the first oxide reduction reactor such that it receives the flue gas, unconverted compounds and oxide particles and separates out the oxide particles and provides increased residence time for reaction of the unconverted compounds;
- injecting oxygen into the first gas-solid separation cyclone to cause increased conversion of unconverted compounds in the separation cyclone;
- oxidizing the oxide particles in an oxide oxidation reactor to create flue gas and unconverted compounds, wherein the oxide oxidation reactor includes a second circulating fluidized bed;
- a
- circulating oxide particles between the oxide oxidation reactor and the first oxide reduction reactor for conversion of the fuel and oxidization of the oxide particles.
A method for effecting the energy conversion of solid fuels containing carbon comprising:
- reacting the solid fuels with oxygen provided by oxide particles to create flue gas and unconverted compounds in a first oxide reduction reactor having an exit, wherein the first oxide reduction reactor includes a first circulating fluidized bed;
- providing a gas-solid separation cyclone having an inlet coupled to the exit of the first oxide reduction reactor such that it receives the flue gas, unconverted compounds and oxide particles, and an exit, the separation cyclone separates out the solid particles and exhausts a gaseous phase out of its outlet with very low solid content and with residual rotation;
- injecting oxygen into the outlet of the gas-solid separation cyclone to cause increased mixing with the gaseous phase exhausted out of the exit thereby increasing conversion of unconverted compounds;
- oxidizing the oxide particles in an oxide oxidation reactor to create flue gas and unconverted compounds, wherein the oxide oxidation reactor includes a second circulating fluidized bed;
- and
- circulating the oxide particles between the oxide oxidation reactor and the first oxide reduction reactor for conversion of the fuel and oxidization of the oxide particles.
Dependencies are inferred from the claim text.