Liquefied Natural Gas Developments Specialreport
نویسنده
چکیده
A multi-tube, spirally-wound, cryogenic heat exchanger, the main heat exchanger (MHE) is the principal piece of heat-transfer equipment in mixed-refrigerant liquefaction cycles for producing liquefied natural gas (LNG). An MHE unit operation model called the spirally-wound tube-bundle module was developed as an integral component of the dynamic simulation capabilities for a process modeling package. The model predicts the axial temperature, vapor fraction and pressure profiles for each tube stream and shell stream and axial and radial temperature profiles for the tube walls, shell wall and insulation. The spirally-wound tube bundle module, together with other key unit operation modules, can be deployed in dynamic process models, for many applications, such as evaluating and optimizing equipment design, controllability and operating procedures during the detailed design phase; training process operators before commissioning and throughout the lifetime of plant operations; as well as engineering studies for troubleshooting and debottlenecking with challenging situations in plant operations.
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