The present invention relates to a process for calcining mineral carbonate, in particular limestone and/or dolostone, in a multiple parallel flow regenerative kiln system comprising N parallel flow regenerative kilns, where N is an integer greater than or equal to 2, each parallel flow regenerative kiln, comprising at least two shafts: a first (10) and a second (20) shaft interconnected by a gas transfer channel (30), said process comprising the steps of, controlling the firing mode and the non-firing mode of the N parallel flow regenerative kilns in such a manner that all the N parallel flow regenerative kilns substantially have the same number of cycles over a predetermined time period and storing the common exhaust gas stream in a variable volume reservoir (300).
22 content of least 20 mole percent on a dry basis, preferably at least 50 mole percent on a dry basis, in particular at least 80 mole percent on a dry basis wherein at least 0.6 10-1222, preferably 0.8 10-1222 are in the form 1422.
5050 comprised in the range from 10 to 40 microns, preferably in the range from 15 to 25 microns and a specific surface BET lower than 0.75 m2/g, preferably lower than 0.6 m2/g.
Multi-shaft vertical kiln (MSVK) for decarbonating carbonated materials (10), preferably carbonated mineral, in particular limestone and/or dolomitic limestone, said kiln (MSVK) comprising a first (100), a second (200), and optionally a third shaft (300) with preheating zones (110, 210, 310), heating zones (120, 220, 320) and cooling zones (130, 230, 330) and a transfer (412, 423, 432) channel between each shaft (100, 200, 300), said kiln (MSVK) being arranged for being cooled with one or more cooling streams (90), said kiln (MSVK) comprising a regenerative heat exchangers (4000) in fluid communication with an opening formed in a wall portion of the or each transfer channel (412, 423, 432) and a process to operate said kiln (MSVK).
A process is disclosed for decarbonation of limestone, dolomite or other carbonated materials and hydration of the decarbonated limestone, dolomite or other carbonated materials. The process may include: heating particles of carbonated materials in a reactor of a first circuit; conveying the particles of carbonated materials by a first entraining gas; transferring the decarbonated particles to a second circuit, in which a second gas circulates, the circuit comprising a hydration section; hydrating the decarbonated particles; and transferring at least a portion of the heat generated by the hydration of the decarbonated particles to the second gas being substantially free of carbon dioxide; The first and second circuits are separated by first selective separation means allowing the passage of solids while substantially preventing the passage of the gases.
A process is disclosed for decarbonation of limestone, dolomite or other carbonated materials and hydration of decarbonated limestone, dolomite or other carbonated materials. The process may include: heating particles of carbonated materials in a reactor of a first circuit; conveying the particles of carbonated materials by a first entraining gas; transferring the decarbonated particles to a second circuit, in which a second gas circulates, the circuit including a hydration section; hydrating the decarbonated particles; and transferring at least a portion of the heat generated by the hydration of the decarbonated particles to the second gas being substantially free of carbon dioxide;. The first and second circuits are separated by first selective separation means allowing the passage of solids while substantially preventing the passage of the gases.
B01J 8/18 - Procédés chimiques ou physiques en général, conduits en présence de fluides et de particules solidesAppareillage pour de tels procédés les particules étant fluidisées
B01J 20/04 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des composés des métaux alcalins, des métaux alcalino-terreux ou du magnésium
C01F 5/16 - Hydroxyde de magnésium par traitement de la magnésie, p. ex. dolomite calcinée, avec de l'eau ou des solutions de sels ne contenant pas de magnésium
C01F 11/06 - Oxydes ou hydroxydes par décomposition thermique de carbonates
A process for direct capture of carbon dioxide in air may include contacting a calcium hydroxide-based composition with air so as to capture CO2 contained in the air by transforming at least some of the calcium hydroxide of the composition into calcium carbonate. A calcium carbonate-based composition is formed and collected. At least some CO2 from the collected calcium carbonate-based composition is extracted, preferably via calcination and/or electrolysis. The calcium hydroxide-based composition has a partial pore volume equal to or higher than 0.09 cm3/g for a range of pores having a diameter between 20 and 200 Å.
222 from at least some of the collected calcium carbonate-based composition, preferably via calcination and/or electrolysis, wherein said calcium hydroxide-based composition has a partial pore volume equal to or higher than 0.09 cm3/g, in particular higher than 0.1 cm3/g, said pore volume being calculated according to the BJH method for a range of pores having a diameter between 20 and 200 Å.
B01D 53/02 - Séparation de gaz ou de vapeursRécupération de vapeurs de solvants volatils dans les gazÉpuration chimique ou biologique des gaz résiduaires, p. ex. gaz d'échappement des moteurs à combustion, fumées, vapeurs, gaz de combustion ou aérosols par adsorption, p. ex. chromatographie préparatoire en phase gazeuse
B01D 53/80 - Procédés en phase semi-solide, c.-à-d. au moyen de boues
B01J 20/28 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation caractérisées par leur forme ou leurs propriétés physiques
B01J 20/30 - Procédés de préparation, de régénération ou de réactivation
B01J 20/04 - Compositions absorbantes ou adsorbantes solides ou compositions facilitant la filtrationAbsorbants ou adsorbants pour la chromatographieProcédés pour leur préparation, régénération ou réactivation contenant une substance inorganique contenant des composés des métaux alcalins, des métaux alcalino-terreux ou du magnésium
11.
PROCESS FOR DECARBONATION OF CARBONATED MATERIALS AND HYDRATION THEREOF AND DEVICE THEREOF
A process is disclosed for decarbonation of limestone, dolomite or other carbonated materials and hydration of the decarbonated limestone, dolomite or other carbonated materials. The process may include: heating particles of carbonated materials in a reactor of a first circuit; conveying the particles of carbonated materials by a first entraining gas; transferring the decarbonated particles to a second circuit, in which a second gas circulates, the circuit comprising a hydration section; hydrating the decarbonated particles; and transferring at least a portion of the heat generated by the hydration of the decarbonated particles to the second gas being substantially free of carbon dioxide; The first and second circuits are separated by first selective separation means allowing the passage of solids while substantially preventing the passage of the gases.
The present disclosure discloses a decarbonation process of limestone and dolomitic limestone with CO2 recovery in a multi-shaft vertical kiln (MSVK) having three shafts with preheating, heating and cooling zones and a cross-over channel between each shaft. The method includes alternately heating carbonated materials by a combustion of a fuel with a comburent up to a temperature range in which carbon dioxide of the carbonated materials is released, the combustion of the fuel and the decarbonation generating an exhaust gas, the decarbonated materials being cooled in the cooling zones with cooling stream(s). Mixing between the exhaust gas and the one or more cooling streams is minimized. The decarbonated materials in two or three of the shafts are cooled with the cooling streams while a supply of the fuel in each shaft is stopped.
C04B 2/12 - Préchauffage, cuisson, calcination ou refroidissement dans des fours à cuve ou dans des fours verticaux
B01D 53/14 - Séparation de gaz ou de vapeursRécupération de vapeurs de solvants volatils dans les gazÉpuration chimique ou biologique des gaz résiduaires, p. ex. gaz d'échappement des moteurs à combustion, fumées, vapeurs, gaz de combustion ou aérosols par absorption
F27B 1/00 - Fours à cuve ou fours verticaux similaires ou à prédominance verticale
F27B 1/04 - Combinaisons ou dispositions des cuves
The present disclosure relates to a decarbonation process of carbonated materials, in particular limestone and dolomitic limestone, with CO2 recovery in a multi-shaft vertical kiln (MSVK) comprising a first and a second shaft with preheating, heating and cooling zones and a cross-over channel between each shaft. The method includes alternately heating carbonated materials by a combustion of at least one fuel with at least one comburent, up to a temperature range in which carbon dioxide of the carbonated materials is released, the combustion of the fuel and the decarbonation generating an exhaust gas. Decarbonated materials are cooled in the cooling zones with one or more cooling streams. The process further includes extracting the exhaust gas from the multi-shaft vertical kiln and feeding a buffer with the extracted exhaust gas.
The present disclosure relates to a decarbonation process of carbonated materials, in particular limestone and dolomitic limestone, with CO2 recovery in a multi-shaft vertical kiln (MSVK) comprising a first and a second shaft with preheating, heating and cooling zones and a cross-over channel between each shaft. The method includes alternately heating carbonated materials by a combustion of at least one fuel with at least one comburent, up to a temperature range in which carbon dioxide of the carbonated materials is released, the combustion of the fuel and the decarbonation generating an exhaust gas. Decarbonated materials are cooled in the cooling zones with one or more cooling streams. The process further includes extracting the exhaust gas from the multi-shaft vertical kiln and feeding a buffer with the extracted exhaust gas.
The present invention relates to a method for monitoring at least one physico-chemical parameter of particle(s), in particular pebble(s) (100), the composition of said particle(s) being selected from the group consisting of quicklime or limestone, comprising the steps of: irradiating the particle(s) with at least one X-Ray source (210), collecting radiations passing through the particle(s) in at least one X-ray detector (200), said detector comprising at least one detection area, said area being adapted to detect one or more energy bins; measuring the intensities or fluxes of the collected radiations for each detection area and energy bin; determining at least one value from the measured intensities or fluxes for each energy bin and for each detection area; determining the at least one physico-chemical parameter of the particle(s) as a function of the at least one value obtained for each energy bin and for each detection area.
G01N 23/087 - Recherche ou analyse des matériaux par l'utilisation de rayonnement [ondes ou particules], p. ex. rayons X ou neutrons, non couvertes par les groupes , ou en transmettant la radiation à travers le matériau et mesurant l'absorption le rayonnement consistant en rayons X en utilisant des rayons X polyénergétiques
16.
PROCESS FOR DECARBONATING CARBONATED MATERIALS AND DEVICE THEREFOR
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.
The invention relates to a method for producing quick lime from lime stone in a continuous regenerative shaft kiln, characterized in that, starting with standard conditions of excessive combustion air for the operation of this kiln, it especially includes a step where the excessive combustion air is progressively reduced until a content greater than 1000 ppm (in volume) of carbon monoxide is reached in the connection flue between the tanks. An increase in the content of gaseous sulphur dioxide is then observed in the gas flue, with respect to a kiln operated in standard conditions.
brevets
