Apparatus and method for controlling the level of oil in a surge drum

Abstract

Abstract APPARATUS CONTROLS THE LEVEL OF OIL IN A SURGE TANK IN A PROCESSING UNIT OF A REFINING SYSTEM, RECEIVING A CHARGE LIQUID AND WHICH IN TURN PROVIDES A CHARGE LIQUID TO A SECOND PROCESSING UNIT OF THE REFINING SYSTEM. A SIGNAL IS PROVIDED CORRESPONDING TO A DESIRED CHANGE >FR TO BE MADE IN THE FLOW RATE OF THE SECOND PROCESSING UNIT CHARGE LIQUID. A FIRST CHANGE NETWORK RECEIVING THE CHANGE SIGNAL DETERMINES THE MAGNITUDE OF THE DESIRED CHANGE TO THE SECOND PROCESSING UNIT CHARGE LIQUID FLOW RATE AND PROVIDES A FLOW RATE SIGNAL FOR CONTROLLING THE FIRST PROCESSING UNIT CHARGE LIQUID FLOW RATE IN ACCORDANCE WITH THE DESIRED CHANGE SIGNAL. THE CHANGE >FH IN THE FIRST PROCSESSING UNIT CHARGE LIQUID FLOW RATE MAY BE EQUAL TO OR SOME PORTION OF THE CHANGE >FR TO BE MADE IN THE SECOND PROCESSING UNIT LIQUID FLOW RATE DEPENDING ON THE MAAGNNITUDE OF THE CHANGE SIGNAL. THE CHANGE >FH DIFFERES IN DIFFERENT PROPORTIONS DEPENDING ON THE MAGNITUDE OF THE CHANGE >FR. THE NETWORK INCLUDES AN ABSOLUTE VALUE CIRCUIT WHICH PROVIDES A SIGNAL CORRESPONDING TO THE MAGNITUDE OF THE CHANGE SIGNAL. THE CHANGE IN THE SECOND PROCESSING UNIT CHARGE LIQUID FLOW RATE IS DELAYED FOR A PREDETERMINED TIME INTERVAL AND THEN IMPLEMENTED. THE DURATION OF THE TIME INTERVAL IS ALSO DETERMINED AS A FUNCTION OF THE MAGNITUDE OF THE CHANGE >FR.

Inventors

• 👤 W Hopkins
• 👤 L Chvatal
• 👤 W White

Bibliographic Details