Gas separation – With nonliquid cleaning means for separating media – Solid agent cleaning member movingly contacts apparatus
Patent
1996-10-16
1998-05-19
Spitzer, Robert
Gas separation
With nonliquid cleaning means for separating media
Solid agent cleaning member movingly contacts apparatus
552575, 55276, 55DIG46, B01D 4710
Patent
active
057529981
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a water-spray separator for purifying particle-polluted exhaust air from a working area and in particular for purifying exhaust air containing paint particles from a spray-painting booth with a flow duct adjacent to the working area and having a cross-sectional extent set by two spaced duct walls, into which polluted exhaust air flows and a fluid is introduced to run along the duct walls.
A main problem when designing water-spray separators is to keep the noise level within the working area as low as possible in order to create tolerable working conditions for the personnel working there. As is shown by the following statements, various measures were taken in conventional water-spray separators so as to reduce the noise level generated by the water-spray separator in the working area.
An apparatus for purifying the exhaust air of spray booths is known from DE 28 14 276. In the conventional apparatus, which is arranged below a base grid of the spray-painting booth, the exhaust air is first supplied to a sharp-edged constriction via a funnel-shaped inlet, the air is then subjected to a significant change of direction and supplied to a second sharp-edged constriction with a lower through-flow cross section than the first constriction so as to allow the exhaust air to flow subsequently into a chamber containing a fluid bath. A washing fluid is introduced into the apparatus along the guide walls of the funnel-shaped inlet so that a veil of fluid is produced at the first constriction edge of the flow duct. The fluid is atomized in a state of turbulence at the second constriction edge behind the change in direction of the flow of exhaust air and is homogeneously mixed with the exhaust air. The veil of fluid formed at the first constriction site causes the paint particles in the exhaust air to be wetted on their surface with washing fluid. A homogeneous air-fluid mixture, which encourages the paint particles contained in the exhaust air to settle on top of one another and which results in an improved separation of these paint particles from the exhaust air, is then produced by the intense atomization at the second constriction site. The agglomerated paint particles are then removed downwards into a fluid bath either along a guide surface located after the second constriction site or they are hurled against a wall opposite the second constriction site; at this wall the particles then also flow into the fluid bath.
In the known apparatus, the veil of fluid at the first constriction edge has a damping effect on the sound waves located inside the flow duct and spreading up toward the spray booth and which are primarily produced at the second sharp-edged flow constriction. A second sound damping is obtained by branching off the flow of exhaust air, since within the flow of exhaust air, the sound waves are, as a result, unable to expand in a straight line up towards the spray booth.
Another conventional water-spray separator is described in DE-OS 33 17 230. The exhaust air in this known water-spray separator is guided by a first venturi, expanded into a dispersion chamber and then guided by a second venturi with a sharp-edged throttle flange into a second chamber with a collecting zone. Rinsing fluid is introduced from a water reservoir into the funnel-shaped inlet area of the first venturi. The flow of exhaust air undergoes a change of direction in the first venturi and can flow through a relatively wide neck into the dispersion chamber. By not providing any sharp-edged projections in the first venturi and by the neck having a relatively wide through-flow cross section, the generation of noise is kept comparatively low in this area. A preliminary separation is achieved in the first venturi in that after passing the neck in droplet form, the water film running along the upper duct wall is mixed with the flow of exhaust air. A dispersing flow extending in a weak arc across a guide surface toward the second venturi is produced. In the second venturi, the polluted exhau
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Eneroth Jan-Mats
Josefsson Leif
Milojevic Dragoslav
ABB Flakt AB
Spitzer Robert
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