Method and device for coupling refrigerating and heat transfer effects
AssigneeCryo Rur
InventorsDenis CLODIC, Joseph TOUBASSY
Life of this patent
Estimating the term…
Abstract
A process using a liquid transfer fluid whose triple point temperature is less than −125° C., such as isopentane, in order to recover cold energy of sublimating and melting substances frosted on exchanger surfaces and more particularly CO2. The same transfer fluid circulates on two coupled circuits, one purely refrigerating, the other heat transferring, when it carries out defrosting operations, and refrigerating to transfer refrigerating power recovered during the defrosting operations.
Claims13
A process for treating fumes containing water vapour and carbon dioxide and optionally a nitrogen oxide, the process comprising a first step of cooling the fumes to be treated, by frosting the water and optionally the nitrogen dioxide NO2, this first step producing cooled fumes, the process comprising a second step of cooling and dehumidifying the cooled fumes, by frosting the water contained in these cooled fumes, this second step producing dehumidified fumes, the process comprising a third step of cooling and decarbonising the dehumidified fumes, by frosting the carbon dioxide into carbon dioxide ice and optionally a nitrogen oxide contained in the dehumidified fumes, each of the three steps of treating the fumes being carried out by an exchanger of a pair of exchangers, a transfer fluid circulating in each exchanger, each exchanger of a pair of exchangers being in the frosting mode for cooling the fumes while the other exchanger is in the defrosting mode for the water ice or the carbon dioxide ice formed during a cooling step carried out previously, the transfer fluid being refrigerating in the exchangers in the frosting mode, the transfer fluid being heat transferring in the exchangers in the defrosting mode, the transfer fluid recovering cold energy of sublimating and melting the carbon dioxide ice obtained in the third, cooling and decarbonisation, step and transferring this cold energy for cooling the fumes in the first treatment step, the transfer fluid having a triple point whose temperature is less than −125° C.
A device for treating fumes containing water vapour and carbon dioxide and optionally a nitrogen oxide, the device comprising a first pair of exchangers (110, 112) for a first step of cooling the fumes to be treated, by frosting the water, this first step producing cooled fumes, the device comprising a second pair of exchangers (106, 108) for a second step of cooling and dehumidifying the cooled fumes, by frosting the water contained in these cooled fumes, this second step producing dehumidified fumes, the device comprising a third pair of exchangers (101, 103), for a third step of cooling and decarbonising the dehumidified fumes, by frosting the carbon dioxide into carbon dioxide ice and optionally a nitrogen oxide contained in the dehumidified fumes, a transfer fluid circulating in each exchanger (110, 112, 106, 108, 101, 103), each exchanger of a pair of exchangers being in the frosting mode for cooling the fumes while the other exchanger is in the defrosting mode of the water ice or the carbon dioxide ice formed during a cooling step carried out previously, the transfer fluid being refrigerating in the exchangers in the frosting mode, the transfer fluid being heat transferring in the exchangers in the defrosting mode, the transfer fluid recovering cold energy of sublimating and melting the carbon dioxide ice obtained in the third, cooling and decarbonisation, step and transferring this cold energy for cooling the fumes in the first treatment step, the transfer fluid having a triple point whose temperature is less than −125° C.
Dependencies are inferred from the claim text.