Abstract: The present disclosure relates to a process for the decarbonation of limestone, dolomite or other carbonated materials. The process may include heating particles of carbonated materials in a reactor of a first circuit to obtain decarbonated particles. Particles of carbonated materials are conveyed by a first entraining gas in the first circuit for preheating. The gas includes the carbon dioxide, the gas composition being substantially free of nitrogen. The carbonated particles are separated from a first entraining gas flow. The decarbonated particles are transferred to a cooling section of a second circuit having a second entraining gas in which the conveyed decarbonated particles release a portion of their thermal energy. The decarbonated particles are separated from a second entraining gas flow. The second entraining gas is substantially free of carbon dioxide.

Abstract: The disclosure relates to a method to capture CO2 from the flue gases emitted intermittently from a power plant burning a synthetic fuel in power-to-fuel-to-power systems. The method comprises arranging a reservoir of Ca(OH)2 to feed a flow of such solids to a countercurrent carbonator located in the flue gas path of the power plant, separating the resulting carbonated solids from the CO2 depleted-gas, storing the carbonated solids in a reservoir of CaCO3 while the power plant is operating, calcining a steady flow of carbonated solids to produce CaO solids and CO2 when the power plant is not operating, hydrating the resulting CaO solids with water to replenish the reservoir of Ca(OH)2 and feeding the CO2 to the power-to-fuel system to manufacture and store the synthetic fuel burned when the power plant is operating.

Abstract: This invention discloses a reactor and methods for heating of a gas as it reacts with a solid. The reactor contains gas conducts that are empty of solids and that cross through a region packed with solids. The wall of the gas conducts has orifices to make it permeable but not selective to gases, while effectively separating the solids from the gas. In the reactor, the heat source to heat up the gas is generated by the exothermic reaction of the solids with one active component of the gas. The region packed with the reacting solids is at temperatures ranging from 500° C. to 1500° C., to promote the heat transfer towards the gas and the high reactivity of the solids with the active components of the gas, that is forced to diffuse from the conduct through the orifices of the conduct wall.

Abstract: This invention relates to a system for CO2 capture from a combustion flue gas using a CaO/CaCO3 chemical loop, wherein the CO2 is captured from large scale combustion systems using CaO as regenerable CO2 sorbent, where CaO particles are carbonated in contact with a flue gas at around 650° C. to later release pure CO2 when supplied with sufficient heat for CaCO3 calcination at around 900° C., wherein the system of this invention is characterized by a first direct heat exchange from a high temperature flue gas to a recirculation stream of calcined solids from the calciner and/or a second direct heat exchange from a flue gas to the carbonated solids arriving to the calciner, thereby reducing the heat requirements for calcination.

Abstract: This invention relates to a system for CO2 capture from a combustion flue gas using a CaO/CaCO3 chemical loop, wherein the CO2 is captured from large scale combustion systems using CaO as regenerable CO2 sorbent, where CaO particles are carbonated in contact with a flue gas at around 650° C. to later release pure CO2 when supplied with sufficient heat for CaCO3 calcination at around 900° C., wherein the system of this invention is characterized by a first direct heat exchange from a high temperature flue gas to a recirculation stream of calcined solids from the calciner and/or a second direct heat exchange from a flue gas to the carbonated solids arriving to the calciner, thereby reducing the heat requirements for calcination.

Abstract: The present invention is included within the field of energy production from carbonaceous fuels with capture of carbon dioxide for its use or permanent storage and in particular relates to devices and methods which enable the improved capture of CO2 by CaO in calcination-carbonation processes due to the use of a recarbonator where the partially carbonated solids from the carbonator are brought into contact with highly concentrated CO2; so that the fraction of carbonate in the solids increases slightly above the effective CO2 carrying capacity in the carbonator and said increase compensates the loss of effective CO2 carrying capacity that said solids undergo in the following calcination-carbonation cycle, thus checking the deactivation process in a higher value of CO2 carrying capacity of the sorbent.

Abstract: The invention relates to a device and a method for biomass combustion and simultaneous CO2 capture for capturing the CO2 generated in said combustion to generate a substantially pure CO2 stream (9) which can be subsequently stored. The device comprises a combustor-carbonator reactor (a) which is fed with biomass and air; at least one solids recycling cyclone (b, c) which separates solids (5) returning to the combustor-carbonator and from which there exits a solids and gases stream (4). The device comprises a calciner B which regenerates CaO, a fluidized bed (d) and means for feeding fresh CaCO3 (12) and for purging solids (11).

Abstract: This invention involves a cyclic method for capturing CO2 from gas streams arising from processes of reforming, gasification or combustion of carbonaceous fuels. The method is based on these gas streams reacting with solids that contain at least CaO and a metal or an oxidized form of the metal. The method is characterized by the oxidized form of the metal being able to undergo a sufficiently exothermic reduction reaction for the heat released during the reaction to cause the decomposition of CaCO3. The thermodynamic and kinetic characteristics of the method of this invention make it ideal for the removal of the CO2 present in gas streams resulting from processes such as hydrocarbon reforming or the combustion of carbonaceous fuels.

Abstract: This invention involves a cyclic method for capturing CO2 from gas streams arising from processes of reforming, gasification or combustion of carbonaceous fuels. The method is based on these gas streams reacting with solids that contain at least CaO and a metal or an oxidized form of the metal. The method is characterized by the oxidized form of the metal being able to undergo a sufficiently exothermic reduction reaction for the heat released during the reaction to cause the decomposition of CaCO3. The thermodynamic and kinetic characteristics of the method of this invention make it ideal for the removal of the CO2 present in gas streams resulting from processes such as hydrocarbon reforming or the combustion of carbonaceous fuels.

Abstract: The invention relates to a device and a method for biomass combustion and simultaneous CO2 capture for capturing the CO2 generated in said combustion to generate a substantially pure CO2 stream (9) which can be subsequently stored. The device comprises a combustor-carbonator reactor (a) which is fed with biomass and air; at least one solids recycling cyclone (b, c) which separates solids (5) returning to the combustor-carbonator and from which there exits a solids and gases stream (4). The device comprises a calciner B which regenerates CaO, a fluidized bed (d) and means for feeding fresh CaCO3 (12) and for purging solids (11).

Abstract: The method proposed consists in superheating a stream of calcined material (normally CaO) to a temperature above the calcination temperature and circulating this superheated stream of calcined material to the calciner, where the solids release heat. This calciner is also supplied with the stream of material to be calcined (normally preheated CaCO3), so that the heat released by the hot CaO stream gives rise to decomposition of the supplied CaCO3 to CO2 and CaO. A portion of the CaO leaving the calciner is the calcined product and the remainder is recycled for superheating in a combustor.

Abstract: The invention relates to a method for separating CO2 from combustion gases, which can be used at areas with large emissions (thermal power stations using any carbonaceous fuel). The separated CO2 stream can be used and/or contained in geological formations. The inventive method aims to reduce the high costs involved in CO2 separation which prevent large-scale use of the CO2 confinement options included in the UN's IPCC reports. Said method consists of bringing the combustion gases into contact with a calcareous sorbent (limestone, calcined dolomite) at 650-750° C., thereby producing the CO2 capture reaction by means of the rapid carbonation of the sorbent. The sorbent is regenerated in another reactor (calciner) which operates in CO2 or CO2/H2O atmospheres.