Patent ID: 8757105

Claim:
A level control system for controlling a liquid level in a vessel containing a two-phase fluid, the system comprising: a plurality of sensors configured to measure parameters related to the vessel, wherein the parameters comprise liquid level in the vessel, vapor flow rate leaving the vessel, pressure in the vessel, temperature of the vessel, and feed-liquid flow rate entering the vessel indicative of a state of the vessel; a predictive controller configured to receive output signals from the plurality of sensors and predict a volume of liquid in the vessel based on output signals from the plurality of sensors and a variation in pressure, thermal load, or combinations thereof in the vessel; wherein the controller is configured to generate a liquid level set point of the vessel based on the predicted volume of liquid over a predetermined time period in the vessel and control a liquid level in the vessel based on the generated liquid level set point by manipulating one or more control elements coupled to the vessel.