Gas separation: apparatus – With gas and liquid contact apparatus – Means forming flowing contact liquid film on apparatus...
Patent
1997-05-16
1998-12-08
Smith, Duane S.
Gas separation: apparatus
With gas and liquid contact apparatus
Means forming flowing contact liquid film on apparatus...
55DIG46, 96324, 96327, B01D 4710
Patent
active
058463038
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a scrubber for cleaning work-area exhaust air polluted with particles, and in particular for cleaning exhaust air containing particles of paint from a spray painting booth, according to the preamble of claim 1.
In such conventional scrubbers, which are arranged e.g. beneath a spray painting booth floor grid, the exhaust air is supplied to an inlet region of a flow duct. Inside the flow duct in which the flow parameters such as speed and pressure are controlled in a known manner by a corresponding cross-sectional design, the flow is then deflected in a direction transverse to the original general flow-in direction in the inlet region. The flow is then supplied to an outlet nozzle where the exhaust air is mixed with a fluid which, running along the duct walls, is introduced into the flow duct. An abrupt constriction of the cross section is usually provided at the outlet nozzle so that the exhaust air, charged with e.g. paint particles, is thoroughly mixed with the fluid. The particles present in the exhaust air, such as particles of paint or droplets of fluid, are deposited on one another so that they can be separated from the exhaust air. For this purpose, the outlet nozzle merges into a chamber in which a fluid bath is located.
In conventional scrubbers, an impact wall, against which a large part of the mixture of exhaust air, fluid and agglomerated particles is hurled before the fluid and particles run along the impact wall into the fluid bath, is arranged in this chamber at a distance opposite the outlet nozzle. When the mixture emerging from the outlet nozzle impacts against the impact wall, a considerable and undesirable amount of foam is, however, produced, particularly if foam-producing constituents are present in the fluid introduced into the flow duct.
The invention is therefore based on the technical problem of creating a scrubber in which foaming is reduced.
SUMMARY OF THE INVENTION
This problem is solved according to the invention by a scrubber comprising the features of a scrubber for cleaning work-area exhaust air polluted with particles, particularly for cleaning exhaust air containing particles of paint from a spray painting booth, comprising a flow duct defined in cross section by two opposite duct walls, the flow duct having an inlet region into which the polluted air flows and into which a fluid running along the duct walls, is introduced, and the flow duct terminating downstream in an outlet nozzle running into the inlet region transversely to the general flow-in direction and being formed between an upper and a lower duct wall portion, wherein a guide wall having in its course at least one curved portion tangentially adjoins the upper duct wall portion downstream of the outlet nozzle.
According to the invention a guide wall tangentially adjoins the upper duct wall section of the outlet nozzle in the region of the scrubber located downstream of the outlet nozzle. As a result, the mixture leaving the outlet nozzle flows tangentially along the guide wall. At least one curved portion, with which the mixture of exhaust air, fluid and agglomerated particles emerging from the outlet nozzle can be diverted into a desired direction, e.g. into a fluid bath located below the outlet nozzle, is further provided according to the invention in the course of the guide wall.
The guide wall according to the invention enables an advantageous direction and guidance of the mixture of exhaust air, fluid and particles immediately adjoining the emergence of flow from the outlet nozzle. The tangential continuation of the outlet nozzle's upper duct wall section allows the guide wall to adapt to an optimum extent to the course of flow. This prevents the emergent mixture from impacting a wall--which would happen in the case of a conventional impact wall at a steep angle--which causes a substantial amount of foam to form. In the solution according to the invention, the mixture, after leaving the outlet nozzle, hits the tangentially adjoining guide wall at most
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ABB Flakt AB
Smith Duane S.
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