Abstract:
Un método para inyectar un líquido directamente en un lecho fluidificado comprende el uso de una tobera doble de fluido en donde se emplea un gas para atomizar el líquido. La configuracion de la tobera (1) permite una dispersion mejorada del líquido en el lecho. La tobera (1) se puede usar adecuadamente en un proceso continuo para la polimerizacion de olefinas en un reactor de lecho fluidificado.
Abstract:
An improved air atomizing spray gun (20) accommodates selective control over flows of air for atomizing liquid coating material into a conically-shaped spray and for forming the spray into a fan-shaped pattern. In one arrangement of the gun structure, respective supplies of atomizing (18) and fan-shaping (30) air are connected to the gun and separately coupled to atomizing (76) and fan air (80) outlet orifices. In another arrangement, only the supply of atomizing air is connected to the gun (20), and a valve on the gun adjustably diverts a portion of the atomizing air for fan-shaping purposes.
Abstract:
Process for delivering via a sprazing nozzle powder grains charged in an electrostatic charging arrangement (1) by friction charging in curved elongated ducts made of electrically non-conducting material, these powder grains being conveyed in a stream of air through the arrangement (1) and out through an outlet (7) in a nozzle component (6). The invention makes possible the effective conveying and delivery of charged powder grains to desired locations a considerable distance away from the delivery unit, whilst simultaneously enabling an even coating thickness of powder to be obtained. After delivery through the powder delivery outlet (7) the powder (16) is influenced by compressed air (17) or the like which flows out through a plurality of air supply outlets (10) spaced at a distance from the said outlet (7), and which is designed to display a higher pressure than that of the stream of powder flowing out so that, with an ejector-like effect, the powder is entrained in a guiding and supporting jet (18) formed by the said compressed air (17) with higher impulsion so that an increase in the speed of the powder particles is obtained, together with control of the form of the cloud of powder (16) delivered through the powder delivery outlet (7). The invention also relates to an arrangement for carrying out the process effectively.
Abstract:
A nozzle (54) for cleaning a gas turbine unit (1) during operation. The invention further relates to a method for washing a gas turbine unit (1) during operation. The nozzle (54) is arranged to atomize a wash liquid in the air stream in an air intake (2) of the gas turbine unit (1) and comprises a nozzle body (40) comprising an intake end (41) for intake of said wash liquid and outlet end (55) for exit of said wash liquid. The nozzle further comprises a number of orifices (42, 46; 42, 46, 60) that are connected to the outlet end (55) and respective orifice (42, 46; 42, 46, 60) is arranged at a suitable distance from a centre axis (49) of said nozzle body (40), whereby the local density of the injected wash liquid in a desired area can be increased with preserved droplet size and thereby the efficiency of the cleaning process can be significantly improved at the same time as the risk for damaging the components in the gas turbine unit is significantly reduced.
Abstract:
A plural component spraying system (10) includes a spray gun (14) supplied by a plural component supply (20) adapted to be attached to a workman's belt. The spraying system (10) also includes a first component source (21), second component source (22), solvent source (25), and compressed air source (24). Individually controllable air-driven pumps for the plural components and the solvent are provided in apparatus (27). The supply (20) includes inlets for the first component (41), second component (42), and solvent (44) and a common outlet (43) connected by a valve (50). The valve (50) connects the first and second components to the outlet (43) or connects the solvent to the outlet (43). The outlet (43) is connected to the spray gun (14). In an air-assisted airless atomatization internal mix system (300), compressed air impignes on an expanding film of mixed first and second component material from the opposite sides thereof and also forwardly and generally parallel to the spray axis, to capture the particules in a small, uniform spray pattern.
Abstract:
Un dispositif permettant de projeter un jet d'eau à pression élevée et uniforme pour nettoyer la surface de la paroi d'un tunnel délivre de l'eau à pression élevée via une conduite d'amenée d'eau à haute pression (4), projette l'eau d'un ajutage (1) à trous elliptiques (2), délivre de l'air comprimé via une conduite d'amenée (5), décharge l'air au travers d'un passage (7') entre la première conduite (8) de section transversale rectangulaire creuse et la deuxième conduite (9) de section transversale rectangulaire cruse disposée à l'intérieur, décharge simultanément l'air via le passage (6') de la deuxième conduite (9), et mélange une partie du jet d'air du passage (7') au jet d'air du passage (6') au travers d'un trou de passage d'air (9'). Le jet d'eau injecté est ainsi déchargé sous forme d'un fluide laminaire entouré d'une pluralité de couches de jet d'air, de manière à projeter un jet d'eau de pression uniforme contre la surface à nettoyer, ce qui permet de nettoyer efficacement la paroi. Ce dispositif peut être utilisé avant la peinture, pour enlever le solvant, etc.
Abstract:
A two-fluid nozzle (10) which is adjustable to provide a substantially constant mixing energy. Adjustment of the two-fluid nozzle (10) is made in accordance with the pressure and mass flow values of the liquid and gas fed to the nozzle. A microprocessor (44) calculates the mixing energy from these values and provides an output to the nozzle (10) to adjust it should its mixing energy be in variance with a pre-selected mixing energy.
Abstract:
Spray gun (10) includes a unitary valve (22) for controlling the flow of polyester resin and catalyst through the gun and discharging the polyester resin and catalyst in converging streams from nozzles (24) and (26) so that the two liquids thoroughly mix as they flow together through the air. Valve (22) includes a rearward, catalyst mixing section (82) composed of an inlet sleeve (90) and an outlet sleeve (91), and a forward resin flow control section (84) composed of an elongate inlet sleeve (144) and an end sleeve (150). Inlet ports are formed in sleeves (90) and (144) and outlet ports are formed in sleeves (91) and (150) to permit the flow of catalyst and resin when an elongated needle (80), extending longitudinally through the center of the sleeves, is disposed in rearward, activated position and to prevent the flow of catalyst and resin when the needle (80) is disposed in forward, deactivated position.
Abstract:
An air atomising nozzle assembly for electrostatic spray guns is disclosed. The nozzle assembly is made of polyamide-imide («Torlon») plastic parts and includes an air cap having a central bore which surrounds a fluid nozzle tip. The fluid nozzle tip has a nut formed on its forward end to facilitate threading of the rearward end of the nozzle tip into a threaded bore of the gun body. Formed on the front part of the nozzle, either as a part of the nut or a cylindrical surface adjacent the nut, is an accurately machined surface engageable in press fit relationship with a mating accurately machined bore of the air cap. These mating press fit surfaces centre the bore of the air cap relative to the nozzle tip so as to leave an annular, evenly dimensioned air flow passage surrounding the nozzle tip and defined between the nozzle tip and the bore of the air cap. The air cap is retained in a one-piece resilient retaining ring by snapping the air cap into an annular lip of the retaining ring. The retaining ring is then threaded onto the gun body to secure the nozzle assembly onto the gun body.