Air Products and Chemicals, Inc.

Philip Albert Brochu

Jorge Anibal Mandler

William Carl Rooney

James Robert Hamilton, Jr

Clifford E Lucas

Gas compression system comprising a driver; a refrigerant compressor driven by the driver and having an inlet and an outlet; a relief pressure safety valve having an inlet in flow communication with the outlet of the compressor, an outlet, and a set point; and a recycle pressure safety valve having an inlet in flow communication with the outlet of the compressor, an outlet in flow communication with the inlet of the compressor, and a set point that is lower than the set point of the relief pressure safety valve.

Utilization of bogdown of single-shaft gas turbines to minimize relief flows in baseload LNG plants

A control system for a process of liquefied natural gas production (LNG) from natural gas using a heat exchanger and a closed loop refrigeration cycle employs independent, direct control of both production and temperature by adjusting refrigeration to match a set production. The control system sets and controls LNG production at a required production value, and independently controls LNG temperature by adjusting the refrigeration provided to the natural gas stream. One exemplary method employs compressor speed, for example, as a key manipulated variable (MV) to achieve fast and stable LNG temperature regulation. Other compressor variables rather than speed may be key MVs, depending on the type of MR compressors employed, and may be the guidevane angle in a centrifugal compressor or the stator blade angle in an axial compressor. The second exemplary method employs a ratio of total recirculating refrigerant flow to LNG flow as the key manipulated variable to effectively control the LNG temperature.

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Allentown, PA, United States of America

Philip Albert Brochu