Supplying homogenous mixtures of different gases in very different proportions, for use in calibrating analyzers or testing exhaust catalysts, involves using static mixer

• Main Authors: RENAUX GERARD, MELEN STEPHANE, MUNOZ MANUEL, GRENOUILLET BERNARD, FOURNIER JEAN MARC, LE GOUEFFLEC GERARD, GAUCHER RENE PAUL
• Format: Patent
• Language: English; French
• Published: 13.12.2002
• Edition: 7
• Subjects: BLASTING; CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TOTRANSPORTATION; CONTROLLING; 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; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LIGHTING; MACHINES OR ENGINES IN GENERAL; MEASURING; MECHANICAL ENGINEERING; MIXING, e.g. DISSOLVING, EMULSIFYING, DISPERSING; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; REGULATING; STEAM ENGINES; SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TESTING; TRANSPORTING; WEAPONS

The mixing chamber comprises a pipe connected to the main gas supply line, so that the gas flows along the pipe, and connected to the other gas supply lines via injectors, where the secondary gas flow is introduced into the main gas flow, and then into a static mixer in the extension to the pipe. An Independent claim is included for a device for synthesizing gaseous mixtures as above, with at least two gas supply lines, a flow regulator on each line, at least one computer-driven automatic controller to control the flow regulators and a mixing chamber into which the supply lines open. The injector is a jet injector producing an azimuthal flow effect at the periphery. The axis of the injector is at 90 deg with the axis of the pipe, an ejection end coaxial with the pipe and an azimuthal component of between 15 and 90. The static mixer has a first section forming a convergent part and then a divergent part; a second section with at least two contractions in the pipe, each obtained by radial crushing of the pipe in one direction, and out of phase with each other by 10 and 45 deg . A third section similar to the first comprises a convergence part and then a divergent part. The first and second sections of the mixer have a length of the order of an initial diameter, and each in pair of convergent then divergent parts the two parts have the same length at least a third of the initial diameter. The mixer does not have any elements protruding from the walls. The mixing chamber is surrounded by an external pipe with the injectors in the gap between the external pipe and the mixing chamber. The gases being mixed which have a risk of flammability are supplied in a different line. L'invention concerne un dispositif de synthèse de mélanges gazeux par mélange d'un gaz de débit principal et d'un gaz de débit secondaire. Ce dispositif comprend des lignes d'approvisionnement en gaz équipées de régulateurs de débit et une chambre de mélange dans laquelle débouchent les lignes d'approvisionnement en gaz. La chambre de mélange comprend : . une conduite connectée d'un part à la ligne d'approvisionnement du gaz de débit principal de manière à ce que ce gaz forme un écoulement dans la conduite, et d'autre part à la ligne d'approvisionnement du gaz de débit secondaire de manière à ce que le gaz de débit secondaire soit introduit dans l'écoulement du gaz de débit principal, . un mélangeur statique placé dans la prolongation de la conduite. Ce dispositif peut être utilisé pour tester des compositions catalytiques.