Control system for industrial water system and method for its use
AssigneeGeneral Electric Company
InventorsZhaoyang Wan, Gary E. Geiger, Yong Zhang, Yu Zhang
Life of this patent
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Abstract
A control system for industrial water systems that utilizes multiple measurements of information and models to decide optimal control actions to maximize corrosion/scaling/fouling inhibition and particulate dispersancy performance and minimize cost of water and treatment chemicals. This system is capable of automatic operation for a wide range of process conditions, ensures multiple performance objectives, achieves robust operation under a variety or un-measurable disturbances and achieves the least costly solution delivery.
Claims27
A control system for monitoring and controlling an industrial water system comprising:
- (a) measuring at least one manipulated variable and at least one measured output representing a safe margin towards a performance boundary;
- (b) determining at least one dynamic transfer function between the at lease one measured output and the at least one manipulated variable;
- (c) defining an index derived from current and future values of the at least one measured output and an index derived from current and future values of the at least one manipulated variable;
- (d) at each sampling time, utilizing a processor to maximize the index of the at least one measured output and minimize the index of the at least one manipulated variable and determine current and future values of the at least one manipulated variable;
- and
- (e) at each sampling time, implementing current value of the at least one manipulated variable within the water system.
A control system for monitoring and controlling an industrial water system comprising:
- a) defining a special class of measured outputs as the safe margins towards performance boundaries;
- b) operating the industrial water system at a condition, where there are safe margins towards performance boundaries;
- c) quantifying impacts of the unmeasured disturbances in terms of shrinking of the safe margins;
- d) identifying dynamic transfer functions from the measured disturbances to the measured outputs;
- e) identifying dynamic transfer functions from the manipulated variables to the measured outputs;
- f) identifying the dependency of the safe margins on the measured outputs related to water chemistry;
- g) defining a performance index as a weighted summation of current and future values of the measured outputs and a cost index as a weighted summation of cost of water and treatment chemicals derived from current and future values of the manipulated variables, taking into account constraints on the measured outputs and the manipulated variables;
- h) at each sampling time, maximizing the performance index and minimizing the cost index and determines current and future values of the manipulated variables;
- and
- i) implementing current values of the manipulated variables within the water system.
Dependencies are inferred from the claim text.