REDUCING AGENT AQUEOUS SOLUTION MIXING DEVICE AND EXHAUST GAS AFTERTREATMENT DEVICE PROVIDED WITH SAME

• Main Authors: TOMIOKA HIROYUKI, ITOU BOKU, KATOU TAKASHI
• Format: Patent
• Language: English; French; Japanese
• Published: 24.07.2014
• Subjects: BLASTING; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; ENGINE PLANTS IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; HEATING; LIGHTING; MACHINES OR ENGINES IN GENERAL; MECHANICAL ENGINEERING; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; STEAM ENGINES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; WEAPONS

A mixing device (3) is provided with: an elbow pipe (31) that is mounted to the outlet pipe (23) of a filter device (2) and that changes the flow direction of exhaust gas that flows from the filter device (2); a straight pipe (32) that is connected to the downstream side of the elbow pipe (31) and that extends in a direction that intersects the axis line (CL2) of the outlet pipe (23) of the filter device (2); an injector (5) that is attached to the elbow pipe (31) and that injects a reducing agent aqueous solution toward the straight pipe (32) inside of the elbow pipe (31); and a mixing pipe (34) that is arranged within the elbow pipe (31) so as to cover the area surrounding the reducing agent aqueous solution that is injected from the injector (5) and that comprises a plurality of openings on the peripheral wall thereof. Cutout openings (34B, 34C, 34D) are provided to a part of the mixing pipe (34) that is fixed to the elbow pipe (31) at a position that allows exhaust gas entering from the inlet section (31B) of the elbow pipe (31) to flow in toward the injection nozzle (51) side. 　L'invention concerne un dispositif de mélange (3) qui comporte: un conduit coudé (31) monté sur un conduit (23) de sortie d'un dispositif filtre (2) et modifiant la direction d'écoulement de gaz d'échappement provenant du dispositif filtre (2); un conduit droit (32) relié au conduit coudé (31) côté aval et qui s'étend dans une direction croisant l'axe (CL2) du conduit de sortie (23) du dispositif filtre (2); un injecteur (5) fixé sur le conduit coudé (31) et injectant à l'intérieur de ce conduit coudé (31), en direction du conduit droit (32), une solution aqueuse d'agent réducteur; un tuyau de mélange (34) situé, à l'intérieur du conduit coudé (31), de façon à entourer et recouvrir la solution aqueuse d'agent réducteur injectée par l'injecteur (5), lequel tuyau de mélange (34) comporte plusieurs ouvertures sur sa paroi périphérique. Sur une partie d'ancrage avec le conduit coudé (31) située sur le tuyau de mélange (34), des ouvertures (34B, 34C, 34D) en fentes sont placées en position d'introduction des gaz d'échappement provenant d'une partie entrée (31B) du conduit coudé (31) en direction de la buse d'injection (51).