US 2020/0369967 A1 · REGULATORY CONTROLLER FOR USAGE IN A CATALYTIC OLEFINS

Abstract

An advanced regulatory controller for a converter of a catalytic olefins unit is disclosed. A Fluid Catalytic Cracking (FCC) type converter (i.e., reactor-regenerator) is combined with an ethylene style cold-end for product recovery. The regulatory controller operates using an Advanced Regulatory Control (ARC) application using variables, such as a controlled variable, four disturbance variables, associated variable, and a manipulated variable. The ARC application manipulates fuel oil or tail gas flow to a regenerator in response to an expected future steady state value of a regenerator bed temperature resulting from changes in the values of a selected set of the variables.

Claims11

Dependent claims

A method of controlling a regenerator bed temperature for a catalytic olefins unit, the regenerator receiving at least an olefin feed, a fuel oil, and a tail gas, the method comprising:

determining at least one disturbance variable associated with the regenerator, the at least one disturbance variable being selected from one of:
(i) an olefin feed rate, (ii) an olefin feed temperature, (iii) a disengager temperature, and (iv) a stripper level;
predicting a change in the regenerator bed temperature based on the determined at least one disturbance variable;
and
determining a setpoint for a flow rate of at least one regenerator input to a regenerator based on the predicted change in the regenerator bed temperature, wherein the at least one regenerator input is selected from one of:
(i) a fuel oil, and (ii) a tail gas.

3 more elements

Dependencies are inferred from the claim text.

Regulatory controller for usage in a catalytic olefins

Life of this patent

Regulatory controller for usage in a catalytic olefins

Life of this patent

Abstract

Claims11