摘要:
Selon ce procédé : o de la vapeur d'eau (5) est générée par un évaporateur (101) situé sur le cheminement des fumées à traiter, o une partie (6) de cette vapeur est envoyée à un réacteur d'activation (401) pour activer des résidus collectés (10) sur un filtre à manches (201) auquel les fumées à traiter sont envoyées, o une autre partie (7) de cette vapeur, utilisée de manière intermittente, est surchauffée et envoyée à un réacteur (301) de dénitrification catalytique des fumées à traiter, pour régénérer son catalyseur réparti en plusieurs couches, ce réacteur de dénitrification catalytique étant segmenté de manière interne par des moyens de segmentation physiques de sorte que la segmentation correspondante est maintenue pour toutes les couches du catalyseur, et o les fumées à traiter sont mélangées à un réactif de dénitrification et sont ensuite introduites en permanence sur la totalité du catalyseur, y compris pendant la régénération du catalyseur réalisée par la vapeur d'eau surchauffée (7') qui est introduite de manière intermittente dans le réacteur de dénitrification catalytique, segment après segment.
摘要:
A process for capturing CO 2 includes contacting a CO 2 -containing gas with an absorption mixture optionally within a packed reactor. The absorption mixture includes a liquid solution and micro-particles. The micro-particles include a support material and biocatalyst supported by the support material and are sized and provided in a concentration such that the absorption mixture flows through the packed reactor and that the micro-particles are carried with the liquid solution to promote dissolution and transformation of CO 2 into bicarbonate and hydrogen ions. The absorption mixture and micro-particles may be provided in an absorption reactor so as to be pumpable. Furthermore, a process for desorbing CO 2 gas from an ion-rich aqueous mixture includes providing biocatalytic micro-particles and feeding the mixture to a desorption reactor, to promote transformation of the bicarbonate and hydrogen ions into CO 2 gas and water.
摘要:
A process for the separation of carbon dioxide from gas mixtures is disclosed in which a metal oxide sorbent, which is used to capture and release carbon dioxide, is recycled. The process incorporates the regeneration of the carbon dioxide capture capacity of the metal oxide to maintain a high capture capacity over many cycles. The regeneration involves hydrating the metal oxide and then heating the resulting metal hydroxide under a gas atmosphere that is effective to suppress the dehydration of the hydroxide so that dehydration occurs at an elevated temperature. The regeneration may also be used independently from the carbon dioxide separation process to produce, from a metal hydroxide, a metal oxide having an enhanced resistance to attrition and fragmentation.
摘要:
A process for capturing CO 2 includes contacting a CO 2 -containing gas with an absorption mixture optionally within a packed reactor. The absorption mixture includes a liquid solution and micro-particles. The micro-particles include a support material and biocatalyst supported by the support material and are sized and provided in a concentration such that the absorption mixture flows through the packed reactor and that the micro-particles are carried with the liquid solution to promote dissolution and transformation of CO 2 into bicarbonate and hydrogen ions. The absorption mixture and micro-particles may be provided in an absorption reactor so as to be pumpable. Furthermore, a process for desorbing CO 2 gas from an ion-rich aqueous mixture includes providing biocatalytic micro-particles and feeding the mixture to a desorption reactor, to promote transformation of the bicarbonate and hydrogen ions into CO 2 gas and water.
摘要:
A formulation and a process for CO2 capture, where a CO2-containing gas in contacted with water, biocatalyst and an amino acid compound, enabling the dissolution and transformation of the CO2 into bicarbonate ions and hydrogen ions, producing an ion-rich solution and a CO2-depleted gas. The amino acids may present slow absorption kinetics and having elevated stability such that absorption is enhanced in combination with the biocatalyst. The amino acid compound and the biocatalyst may be selected such that the active sites of the biocatalyst benefit from proton removal facilitated by the amino acid compounds, thus improving the CO2 absorption.
摘要:
The present invention relates to a process for the recovery of ammonia contained in a gaseous stream, said process comprising the following phases: (a) subjecting the gaseous stream containing ammonia to a washing with an aqueous washing solution having a pH lower than 7.0, with the formation of a purified gaseous stream and an aqueous solution containing an ammonium salt; (b) treating the aqueous solution containing the ammonium salt coming from phase (a) in a vertical falling film heat exchanger at a temperature from 50 to 250°C and an absolute pressure ranging from 50 KPa to 4 MPa with the formation of a regenerated washing solution and a gaseous stream comprising NH 3 and H 2 O; (c) recycling said regenerated washing solution to phase (a). The present invention also relates to equipment for effecting the above process.
摘要:
In an internal combustion engine, a NOx selective reduction catalyst (15) is disposed in an engine exhaust passageway, and an oxidation catalyst (12) is disposed in the engine exhaust passageway upstream of the NOx selective reduction catalyst (15). At the starting of the engine, HC is fed to the oxidation catalyst (12) from a HC supply valve (28) and by the resultant oxidation reaction heat of HC, the NOx selective reduction catalyst (15) is heated. In this stage, the temperature of the NOx selective reduction catalyst (15) is raised to that falling in the HC desorption temperature range in which HC is desorbed from the NOx selective reduction catalyst (15).