Gas separation – Means within gas stream for conducting concentrate to collector
Patent
1981-08-07
1983-08-16
Spitzer, Robert H.
Gas separation
Means within gas stream for conducting concentrate to collector
55182, 55201, B01D 1900
Patent
active
043989306
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates generally to the deaeration of fluid and more particularly to deaeration of fluid in a fluid pressure circuit.
BACKGROUND ART
A fluid, as for example diesel fuel, in a pump circuit which comes in contact with a gas such as air often dissolves and/or entrains the air which is then transported throughout the fluid flow circuit. The entrained, compressible air in the fluid causes the normally incompressible fluid to be somewhat compressible which, in turn, may result in a miriad of problems. The problems vary from erratic volumetric efficiency of pumps to erratic readings from flow meters as both compressible and incompressible fluids flow through the circuit. Also, air pockets may form in the circuit as entrained air leaves the fluid which can result in foaming of the fluid and occasional slug flow patterns which possibly could damage equipment such as pumps.
It has been known in the prior art to provide a deaeration means in the pump circuit to remove air entrained in the fluid. It has also been known to overpressurize the fluid in order to increase the ability of a fluid to dissolve a greater amount of gas thereby reducing the amount of free gas bubbles.
One such deaeration means known to be used is an atmospheric reservoir having a top inlet and a bottom outlet, sized so as to hold the fluid long enough for the entrained air to slowly rise and pass out of the fluid. This approach somewhat alleviates the problems attending entrainment, however, the required reservoir may be prohibitively large. Additionally, the flow of fluid within the reservoir may develop flow patterns such that sufficient time is not provided to release the air. Providing a reservoir with baffles which avoid the flow patterns mentioned above is also known but the atmospheric release of entrained air requires substantially long hold up times and the reservoir itself often becomes a source of more entrainment as the fluid absorbs the air.
Another method known to deaerate fluid is to allow the incoming fluid to cascade into the reservoir over a baffle as a thin film as shown in U.S. Pat. No. 3,638,760 issued Feb. 1, 1972 to Heinz Lamm. The thin film cascading of the fluid enables the entrained air to be released from the fluid. This method may result in re-entrainment of air as the incoming fluid falls against the main body of fluid trapping air therebetween.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF THE INVENTION
In one aspect of the present invention a closed tank is provided with an inlet to receive and slow the velocity of fluid, an outlet to pass the fluid disentrained of gas out of the tank, and a vent for exhausting the gas which has been liberated from the fluid. A pressure regulating value means adjacent to the fluid inlet, induces negative pressure waves in the fluid which cause dissolved gas to dissociate and combine to form the larger bubbles of entrained gas. As the fluid, now carrying entrained gas, enters the tank, the fluid flow velocity is reduced thereby giving the bubbles of entrained gas an opportunity to rise, collect and be exhausted before the bubbles can break up and redissolve.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the fuel deaeration apparatus of an embodiment of the present invention;
FIG. 2 is a view of the fuel deaeration apparatus of FIG. 1 taken along line 2--2; and
FIG. 3 is a view of the fuel deaeration apparatus taken along line 3--3 of FIG. 1.
BEST MODE FOR CARRYING OUT THE INVENTION
Turning to the drawings an embodiment of a fluid deaeration apparatus 10 of this invention is shown. A typical use of the deaeration apparatus 10 is in a closed fluid circulating circuit, shown schematically in FIG. 1, such as a circuit which tests diesel fuel injection pumps wherein the fluid is circulated by a circulating pump 11. The circulating pump 11 discharges the fluid containing entrained and dissolved air which is routed to various demand points shown generally as P and as an injector pum
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Larson Larry A.
Murphy Brian J.
Caterpillar Tractor Co.
Spitzer Robert H.
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