Water treatment control system for treating cooling tower makeup water
AssigneeAmerican Hydro Systems, Inc.
InventorMarshall Craig
Life of this patent
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Abstract
An apparatus and method for controlling the amount and concentration of make-up water and chemicals introduce into the recirculating water of a cooling tower system. A float operated make-up valve controls the addition of make-up water to the tower. As make-up water is added to the tower a vacuum is produced at an injector valve which draws chemicals from a chemical holding tank into the make-up water, thereby allowing precise control of the chemical concentration in the make-up liquid. Further, a bleed valve is provided which is responsive to the vacuum produced at the injector valve and bleeds a portion of the recirculating water to waste.
Claims28
A water cooling tower system which comprises:
- a water cooling tower having means for recirculating a liquid therethrough;
- means for adding make-up liquid to the tower in order to compensate for recirculated liquid lost to evaporation;
- means for sensing and controlling the level of liquid in the cooling tower, said means for adding make-up liquid to said tower being responsive to said liquid level sensing and controlling means, whereby when a minimum level of liquid is sensed by said liquid level sensing means, make-up liquid is added to said tower by said means for adding make-up liquid;
- and
- vacuum responsive chemical additive means connected to said means for adding make-up liquid to said tower for controlledly adding chemicals to the make-up liquid in response to a vacuum created as a result of the make-up liquid being added to the tower.
A water cooling tower system as defined in claim wherein said vacuum responsive chemical additive means includes an injector valve in which a vacuum is produced as make-up liquid passes through it.
A water cooling tower system which comprises:
- a water cooling tower having means for recirculating a liquid therethrough;
- means for adding make-up liquid to the tower in order to compensate for recirculated liquid lost to evaporation;
- means for sensing and controlling the level of liquid in the cooling tower, said means for adding make-up liquid to said tower being responsive to said liquid level sensing and controlling means, whereby when a minimum level of liquid is sensed by said liquid level sensing means, make-up liquid is added to said tower by said means for adding make-up liquid;
- vacuum responsive chemical additive means connected to said means for adding make-up liquid to said tower for controlledly adding chemicals to the make-up liquid in response to a vacuum created as a result of the make-up liquid being added to the tower;
- and
- vacuum responsive liquid removal means for bleeding a portion of said recirculate liquid to waste.
A method of controlling the chemical concentration in a water treatment system comprising a cooling tower containing a liquid which is recirculated therethrough comprising the steps of:
- sensing the liquid level in the cooling tower;
- adding make-up liquid to the cooling tower in response to the liquid level in the cooling tower dropping below a predetermined level;
- producing a vacuum in response to said adding make-up liquid;
- adding chemicals to said make-up liquid in response to said vacuum;
- and
- bleeding a portion of said recirculated liquid to waste.
Dependencies are inferred from the claim text.