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Diffuse logic

Diffuse logic is a set of complex control algorithms that optimise energy control and improve the stability of the biological process by controlling aeration in the biological reactors.

This control system is always feasible as long as the aeration system is through blowers and diffusers.
 

The diffuse logic control system establishes independent control links for the dissolved oxygen in each tank and for the discharge pressure for the blowers. The concentration of dissolved oxygen in each tank is maintained by modifying the control valve and the discharge of air by modifying the number of blowers functioning and the speed at which they turn. This is how the tanks are aerated by using a set of blowers.
 

That one control valve is being moved will not affect the rest of the system as pressure is always kept at established values.
 

The default values are determined and controlled by a supervising algorithm. The supervising control system continuously establishes the pressures values to the minimum necessary for the system to perform correctly, thus reducing energy consumption. This minimum value allows us to keep dissolved oxygen levels where we want them and one of the control valves constantly open. For this system to work correctly, reactor draught must be similar in all cases.
 

The next figure shows the flow diagram of the proposed control system applied to aerating three tanks with only one group of blowers. Each oxygen sensor feeds an independent control link that acts on the corresponding control valve. On the other hand, pressure feeds the control link that affects the turn speed of the blowers. From our information on dissolved oxygen concentrations, opened valves and pressure, the control supervisor establishes the default values for all control links. The default value for pressure is modified so that there is always one valve completely open.

 

In the aeration control system proposed, control actions are decoded by algorithms based on diffuse logic programmed into the plant IT system. As a consequence, for the control system to work correctly it is of vital importance that all sensor signals reach the computer.
 

 

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