System for fluid stream treatment using feed forward of analysis of a diverted treated pilot stream

A system for controlling an amount of a selected characteristic in a main fluid stream by introducing a precise amount of a treatment fluid, the system comprising in combination:

• a pilot treatment pathway having an inlet port located in the main fluid stream, such that a portion of the main fluid stream is diverted as a pilot fluid stream;
• a pilot treatment fluid inlet for addition of treatment fluid into said pilot fluid stream located at a first location on said pilot treatment pathway, said treatment fluid inlet coupled to a source of treatment fluid;
• a selected characteristic analyzer located at a second location on said pilot treatment pathway, said second location located downstream from said first location;
• a main treatment fluid inlet located on the main fluid stream at a location downstream from said inlet port, said main treatment fluid inlet coupled to a source of treatment fluid;
• and
• a throttle located between said main treatment fluid inlet and said source of treatment fluid, said throttle at least partially controlled by said analyzer.

A fluid stream treatment controller for precisely controlling introduction of treatment fluid into a main fluid stream, the controller comprising in combination:

• a pilot treatment pathway having an inlet port located in the main fluid stream, such that a portion of the main fluid stream is diverted as a pilot fluid stream;
• a pilot treatment fluid inlet located at a first location on said pilot treatment pathway in said diverted pilot fluid stream, said pilot treatment fluid inlet coupled to a source of treatment fluid and having an amount of the treatment fluid passing through said inlet controlled by a pilot treatment fluid flow rate control signal;
• a selected characteristic analyzer located at a second location on said pilot treatment pathway downstream from said first location, said selected characteristic analyzer generating a selected characteristic feedback signal corresponding with an amount of the selected characteristic measured by said analyzer;
• said treatment fluid flow rate control signal at least partially related to said feedback signal;
• and
• a feed forward signal coupled to a main treatment fluid inlet located on the main fluid stream downstream from said inlet port, said main treatment fluid inlet having a throttle located adjacent thereto, said throttle controlled at least partially by said feed forward signal, said feed forward signal at least partially related to said feedback signal from said analyzer.