Precise oxygen to carbon ratio control in oxidation reformers

B - Operations – Transporting – 01 – J

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B01J 8/00 (2006.01)

Patent

CA 2571916

An autothermal reformer or a catalytic partial oxidizer (19) receives flow of desulfurized hydrocarbon fuel from a hydrogen desulfurizer (HDS) (15) through an orifice (13a). A differential pressure transducer (13b) provides a signal (24a) to a fuel-flow differential-pressure schedule (13c) to provide a fuel flow signal (24b) which is (25) subtracted from fuel command (26), to provide a valve position signal 30a from a proportional/integral gain (29), being linearized (58) to control the fuel valve (12). The minimum (59) of actual fuel flow (24b) and fuel flow command (59) is applied to an air/fuel schedule (33). The resulting air flow command is compared with actual air flow (41b) to provide an air flow control signal 48a which is linearized (60) after proportional/integral gain (47) to provide air flow command (48b) to a blower (49). Differential pressure (42b) across an orifice (42a) is provided to a schedule (42c) which converts to the actual air flow feedback (4lb). A laminar flow restriction (42b) may be warmed by a CPO (19).

L'invention concerne un reformeur autothermique, ou un dispositif (19) d'oxydation partielle catalytique, destiné à recevoir par un orifice (13a) un flux de combustible hydrocarboné désulfuré d'un dispositif (15) de désulfuration d'hydrogène (HDS). un transducteur (13b) de pression différentielle transmet un signal (24a) à un dispositif (13b) de gestion de pression différentielle du flux de combustible afin d'obtenir un signal (24b) de flux de combustible qui est soustrait d'une commande (26) de combustible de manière à obtenir un signal (30a) de position de valve de gain proportionnel/intégral (29), linéarisé (58) pour commander la valve (12) de combustible. Une quantité minimale (59) du flux (24b) de combustible réel et une commande (59) de flux de combustible sont appliquées à un dispositif (339 de gestion d'air/combustible. La commande de flux d'air obtenue est comparée au flux d'air réel (41) afin d'obtenir un signal (48) de commande de flux d'air qui est linéarisé (60) par rapport au gain proportionnel/intégral (47) afin de générer une commande (48b) de flux d'air dans un ventilateur (49). Une pression différentielle (42b) est transmise par un orifice (42a) à un dispositif (42c) de gestion effectuant une conversion de réaction (41b) du flux d'air réel. Un dispositif (42) d'étranglement de flux laminaire peut être chauffé par un CPO (19).

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