Patent ID: 7328726
Filing Date: 2008-02-12
Classification: B01F,C01B,G05D,Y02E

Abstract:
1. A process for delivering a blend of two or more compressed gas streams to a receiving vessel, the process comprising: (a) blending two or more compressed gas streams to form the blend, wherein each of the two or more compressed gas streams (1) is supplied by a separate compressed gas supply source, (2) is under the control of one or more pressure regulators, and (3) is subject to mass flow rate measurement by one or more flow detectors; and (b) delivering the blend to the receiving vessel at a preset blend ramp rate, wherein (I) a programmable controller (1) receives data from the one or more flow detectors representing the mass flow rates for at least two of the two or more compressed gas streams (2) calculates a cumulative mass ratio for the blend based on the mass flow rates of at least two of the two or more compressed gas streams, and (3) (i) compares the calculated cumulative mass ratio for the blend to a pre-set blend cumulative mass ratio, and (ii) adjusts the pressure regulator for at least one of the two or more compressed gas streams as necessary to maintain the calculated cumulative mass ratio for the blend within a specified tolerance of the pre-set blend cumulative mass ratio; and (II) at least two of the two or more compressed gas streams have different compositions.