Gas separation: apparatus – Degasifying means for liquid – Pressure reducing means
Patent
1998-10-24
2000-09-05
Smith, Duane S.
Gas separation: apparatus
Degasifying means for liquid
Pressure reducing means
95147, 210188, B01D 1900
Patent
active
06113676&
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a deaerator designed for use in oil circulating lubrication systems.
The deaerator of the invention has been specially developed for the oil circulating lubrication system of a paper machine, but it can also be used in other areas of process engineering and in large assemblies of equipment employing oil circulating lubrication systems.
In the oil circulating lubrication systems of paper machines, some air is always mixed with the oil. Air bubbles in the oil impair its lubricating properties and e.g. prevent high-speed operation of paper machines.
A prior-art attempt to eliminate the problems resulting form the presence of air bubbles in the oil is to increase the amount of oil in the system by using a larger oil tank. This is based on the expectation that, as the oil stays longer in the tank, the air bubbles will have enough time to rise to the surface and get out of the oil before it returns to the lubrication circulation.
There are also various flow guides used in oil tanks to keep the oil longer in the tank and to allow more effective separation of air bubbles. However, by monitoring the oil flow and taking samples of incoming and outgoing oil, it has been found that usually only about 20% of the oil is moving in the tank. In other words, most of the oil in a large tank remains stationary and the incoming oil flows almost directly through the tank back to circulation without undergoing any notable purification or separation of air in the tank. The same fact has also been discovered in investigations, in which it has been established that the incoming oil and the outgoing oil contain practically equal amounts of air and other impurities.
To eliminate the problems described above, an apparatus according to patent specification DE 1038847 has been used. However, the apparatus presented in this specification is very complex and requires several power means for operation, and in addition it suffers from the significant problem described above, in other words, air is not separated in the large tank in the desired manner but only part of the oil flows along the path built through the tank while most of the oil remains stationary in the tank.
SUMMARY OF THE INVENTION
The object of the present invention is to eliminate the drawbacks mentioned above. A specific object of the invention is to produce a new type of deaerator which allows effective separation of air from the oil before the oil tank and which is as simple in structure as possible as well as reliable in operation.
The deaerator of the invention comprises an inlet container, which acts as an air lock and into which the oil to be purified flows through a return pipe. The inlet container is so disposed in relation to the main oil tank of the oil circulating lubrication system that the oil level in it is always higher than the oil level in the main oil tank. Moreover, the deaerator comprises a separating container placed substantially higher than the inlet container, with a vertical rising pipe leading from the inlet container into the separating container. From the separating container, the oil is passed via a substantially vertical outlet pipe into the oil tank. Moreover, the separating container is provided with a suction connection to create a negative pressure in the separating container and to remove the separated air from the separating container. Thus, when a sufficient negative pressure prevails in the separating container, the oil will flow freely by gravitation through the deaerator without having to be pumped and without its flow or movement having to be promoted in any other way.
The rate of oil flow through the deaerator is naturally mainly determined by the pipe diameters, but preferably the rising pipe is provided with an adjustable check valve or a corresponding element to allow the oil flow rate in the rising pipe to be adjusted.
Since the oil stays in the separating container for some time, it is possible that different impurities, sediment and rubbish will be accumulated o
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Oy Hydrox-Pipeline Ltd.
Smith Duane S.
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