Controlled Variables Selection for Liquefied Natural Gas Plant
نویسندگان
چکیده
The primary operational objective of liquefied natural gas (LNG) plants with low production capacity is to maximize LNG production. A robust control structure is required to meet economic objective while ensuring safety of the plant. The selection of appropriate controlled variables (CVs) is critical for design of the control structure. In this paper, general process understanding and the concept of selfoptimizing control are used to select CVs for the liquefaction unit of an LNG process. The analysis is carried out using a steady state model developed in gPROMS. It is shown that with appropriate selection of CVs, the effect of disturbances and uncertainty can be minimized on the operational objective of the LNG plant.
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