Method for controlling a gas flow between a plurality of gas streams

摘要

The present invention relates to a method and apparatus for controlling a gas flow through a conjunction between one or more incoming streams and one or more outgoing streams through a conjunction. The method uses a biased mass flow imbalance value obtained by comparing the aggregate of incoming mass flow measurement value(s) with the aggregate of outgoing mass flow measurement value(s) and adding a bias component to provide the biased mass flow imbalance value. The flow of at least one of the incoming and outgoing streams (12, 14, 16, 18, 20) is adjusted to move the biased mass flow imbalance value towards zero. In addition, a conjunction pressure measurement (PC) is provided, which is used to adjust the bias component in response to a change in the conjunction pressure measurement (PC) relative to a pressure set point (PSP), to mitigate the change in the conjunction pressure measurement (PC) relative to the pressure set point (PSP).

主权项

1. A method for controlling the gas flow between one or more incoming streams and one or more outgoing streams through a conjunction comprising:
(a) determining the mass flow of at least one of the incoming streams to provide one or more respective incoming mass flow measurement value(s); (b) determining the mass flow of at least one of the outgoing streams to provide one or more respective outgoing mass flow measurement value(s); (c) providing a biased mass flow imbalance value by comparing the aggregate of all the incoming mass flow measurement value(s) of step (a) with the aggregate of all the outgoing mass flow measurement value(s) of step (b) and adding a bias component to provide the biased mass flow imbalance value; (d) measuring a quantity indicative of the gas pressure at the conjunction to provide a conjunction pressure measurement (PC); (e) adjusting the flow of at least one of the incoming and outgoing streams to move the biased mass flow imbalance value towards zero; and (f) adjusting the bias component of the biased mass flow imbalance value in response to a change in the conjunction pressure measurement (PC) relative to a pressure set point (PSP) to mitigate the change in the conjunction pressure measurement (PC) relative to the pressure set point (PSP).