Fluid handling – Processes – With control of flow by a condition or characteristic of a...
Patent
1998-12-23
2000-10-10
Hepperle, Stephen M.
Fluid handling
Processes
With control of flow by a condition or characteristic of a...
137 9, 137 93, G05D 1113
Patent
active
061291048
ABSTRACT:
A method for controlling the addition of liquid treatment chemicals by automatic dose control. The calculation of the amount of chemical to be dosed into the system combines signals from a liquid flow meter, an influent chemical concentration analyzer and/or an effluent chemical concentration analyzer. The signals are directed to a computerized chemical dose controller that analyzes and adjusts the data from the signals and generates an output signal that controls the chemical dosing mechanisms. For example, the automatic dose control method encompasses the ability to set maximum positive and negative limits of control action as well as the ability to automatically or manually control the reset period necessary to allow previous changes to propagate through the system and be displayed at the effluent sensor thereby improving the dosing of the chemical during treatment of a liquid, wastewater for example.
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"Classical Feedback/Feed forward Central Applied to Methanol Dosing for Posting-Dentrification" Anjou Re Cherche, 1013N998, no date given.
Bonazza Joseph M.
Ellard Gregory A.
D'Ambrosio Jo Katherine
Hepperle Stephen M.
Tetra Process Technologies a Severn Trent Services Company
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