METHOD AND APPARATUS FOR BLENDING PROCESS MATERIALS

摘要

METHOD AND APPARATUS FOR BLENDING PROCESS MATERIALS A blending system, comprising first and second material supply lines (18); a mixer (22) to provide a blend having a predetermined composition and a predetermined flow rate; and a control system comprising first and second flow control devices (21) and a first concentration sensor (92) on the first line and a second concentration sensor (93) on the second line; and a controller (91), to provide a respective control signal to each of the first and the second flow control devices that respectively adjusts a flow rate of the first material and a flow rate of the second material to maintain the predetermined flow rate of the blend in response to variations in the concentration of at least one of the first and second materials.