Distillation: apparatus – Apparatus – Systems
Patent
1987-07-21
1989-10-31
Manoharan, Virginia
Distillation: apparatus
Apparatus
Systems
202197, 202264, 203 1, 203 10, 203 12, 203 20, 203 40, 203DIG17, 203DIG18, 73304R, 340620, 137 5, 137386, 137392, 552576, B01D 342, G01F 2300
Patent
active
048774898
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to electronic control dosing system for desalinators.
2. Prior Art
International Application No. PCT/AU83/00048 (International Publication No. WO83/03821) discloses a desalinator for brackish-a-salt water which has generally proved successful for the economic installation of fresh water e.g. for vessels.
That desalinator has been shown to have improved performance over known desalinators. In particular it has a more stable boil as air is not entrained in the feed water supplied to the evaporation chamber, as the feed water does not pass through the pump supplying cooling water to the condenser tubes, as is commonly found in other known desalinators.
The desalinator, however, is not totally free of entrainment caused by aeration or ebullition resulting from an unstable boil as there are many other factors which may cause the boil in the desalinator to become unstable. These factors can include rapid increases in feed water temperature (i.e. 7.degree. C. variation in seawater within a few meters have been noted); changes in flow of feed water and/or condensing water; vessel pitching or rolling; or the presence of microorganisms, plankton, fine coral-sand, chemicals, detergents or effluent in the feed water which can cause seeding of the unstable boil.
SUMMARY OF THE PRESENT INVENTION
It is an object of the present invention to provide a monitoring system to detect bubbles and froth indicating entrainment is occurring to control the feed water level and input.
It is a preferred object of the present invention to provide a method and means for dosing the feed water with a foam inhibitor and/or a scale inhibitor.
It is another preferred object of the present invention to provide an automatic dumping device as a fail-safe system should a mechanical breakdown occur.
Other preferred objects of the present invention will become apparent from the following description.
In one aspect the present invention resides in a feed water level control system for a desalinator including:
a feed water inlet to the evaporation chamber of the desalinator;
feed water valve means operable to control the flow of feed water through the inlet in response to the feed water level in the desalinator;
a baffle above the evaporator zone to allow steam to pass to the condenser zone to be condensed;
electric probe means above the baffle; and
electronic control means connected to the probes and operable to control the valve means, so arranged that when contaminated water or steam rises through the baffle and contacts the probes, the control means operates the valve means to shut off the flow of feed water to the inlet until the contamination is overcome.
In a second aspect the present invention resides in a foam and/or scale inhibitor dosing unit for a desalinator including;
a feed water inlet to the desalinator;
feed water valve means operable to control the flow of feed water through the inlet in response to the feed water level in the desalinator;
an inhibitor supply tank; and
an inhibitor supply valve means controlled by a timer to allow a preset volume of inhibitor to be fed to the feed water.
Preferably the feed water valve means is a solenoid valve which is upstream of a ballcock valve with a ball that monitors the feed water level in the desalinator. Preferably the feed water is drawn from the outlet side of the condensation tubes and is fed through a strainer to the feed water inlet via the solenoid valve which is controlled by the control means to shut off the flow of feed water to the desalinator if the boiling of the water in the desalinator becomes unstable.
Preferably an entrainment mesh is provided below the condenser (in a tunnel between the evaporator and condenser zones) to prevent any water droplets coming in contact with the condenser coils if the boiling becomes unstable, the entrainment mesh only allowing droplet-free steam to enter the condenser zone.
Preferably the electronic control system controls an automatic dumping device which has tw
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Manoharan Virginia
Nautical Services Pty. Ltd.
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