Gas separation – Mounted or supported for continuous motion – Differentially deflected system fluid constituents
Reexamination Certificate
2000-02-14
2001-01-23
Smith, Duane S. (Department: 1724)
Gas separation
Mounted or supported for continuous motion
Differentially deflected system fluid constituents
C055S407000, C095S270000
Reexamination Certificate
active
06176889
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention is related to devices for separating gaseous solutions or mixtures and, more particularly, to an apparatus for separating droplets and/or solid particles from a gas.
2. Description of the Related Art
Water, fibers or other such particles have commonly been separated from gas, particularly in connection with exhaust air of a paper machine wire section ventilation system, by using cyclone-type separators. A drawback of such separators is their great dimensional size when air flow is for example 10-30 m
3
/s. Additionally, great pressure losses of cyclones and also their weak ability to separate the lightest particles or water mist has been experienced as a problem.
Another known way has been to provide an exhaust duct with so called vortex-separators, of which an example is shown in U.S. Pat. No. 4,014,673. In the solution according to that, fixed vanes impart rotating movement to the flowing air, whereupon particles flowing along the air are thrown into side walls of the device. Pressure loss required for accomplishing adequate centrifugal forces is a disadvantage in operation of this device also. In such devices, where only simple vanes are used, small particles moving near the center of the device do not have time to reach the side walls of the device before leaving it, whereupon the degree of separation remains unsatifactory.
In the solution shown in Finnish patent document 28784, the requirement for gas and collected water to move into different directions in an exhaust duct causes problems. In order to operate reliably, this solution calls for an extremely large diameter of the shell for reducing air velocity to a level, in which formed droplets do not follow the air flow anymore. Additionally, the device must be in a certain position in order to function at all.
In the solution shown in Finnish patent document 89562, the exhaust air is forced to make a change in flow direction, which in case high velocities are in question means always exess pressure losses and consumption of power. Additionally the construction requires a great deal of space.
In DE 3438400 there is shown circularly placed, specially formed plates for separating droplets. The plates are intended to change the direction of air flow and thus cause suitable impact and collect surface for the droplets. In this kind of solution problems may arise if the air contains also other impurities than liquid and if air velocity changes.
It is an intention of the present invention to provide an apparatus which minimizes the problems of prior art.
SUMMARY OF THE INVENTION
The apparatus according to the present invention has several considerable advantages. The apparatus of the present invention may always be installed in a desired position according to installation place. The solution according to the invention may be connected to an already existing centrifugal blower. In the solution according to the present invention the exhaust air (or gas) does not have to make substantial changes in direction, which makes it possible to avoid generation of exess pressure losses and thus also unnecessary power consumption. Additionally, the space requirement of the apparatus according to the invention is very small. In the solution according to the invention a droplet or any impurity carried by gas flow is always subjected to adequate velocity, regardless of gas flowrate, for reaching a surface for adhesion. The surface being smooth, it remains better clean and keeping it clean is simple by injecting for example cleaning water into the gas flow.
The present invention is directed to an apparatus for separating droplets and/or solid particles from gas, which apparatus comprises a shell defining a space into which an impeller and a gas inlet duct for introducing gas and liquid and/or solid particles into the space are arranged, and a driving device for rotating the impeller.
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EV Group Oy
Kubovcik & Kubovcik
Smith Duane S.
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