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摘要:The MCR® Cryogenic Heat Exchanger (MCHE) is the Heart of the FPSO LNG Plant The MCHE is the heart of the natural gas liquefaction process. Air Products' MCR® heat exchangers feature a proven robust mechanical design along with high-qua..
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The MCR® Cryogenic Heat Exchanger (MCHE) is the Heart of the FPSO LNG Plant The MCHE is the heart of the natural gas liquefaction process. Air Products' MCR® heat exchangers feature a proven robust mechanical design along with high-quality fabrication, leading to the successful operation of the LNG process. Each MCR® heat exchanger is custom designed by our own engineers. The MCHE consists of one or more spiral-wound tube bundles housed within a single pressure shell. The tube bundles are made up of small-bore aluminum tubing, providing a large amount of heat transfer area in a compact unit and permitting high operating pressures for greater process efficiency. The deck space taken up by the wound coil exchanger is much smaller than that which would be required by the large number of brazed aluminum core exchangers that would be required in parallel to approach the performance of a single wound coil exchanger. The use of mixed refrigerant with a wound coil exchanger in place of the traditional propane precooling scheme effectively combines three or four levels of propane precooling, and the attendant multiple shell and tube, brazed aluminum exchanger, or core-in-kettle type evaporators, into a single wound coil exchanger which takes up very little deck space. The use of MCR® with a wound coil exchanger for liquefaction versus multiple brazed aluminum exchangers with associated cold boxes effectively reduces the deck space required by over 15%. The Air Products spiral-wound MCHE provides a compact and inherently safe equipment arrangement in the layout constrained FPSO environment. The MCHE and the Process can be Optimized for Any Combination of Design Constraints
The MCHE and the process can be optimized for the entire spectrum of economic factors, feed gas conditions, LNG product specifications and FPSO vessel design constraints. Possibilities include single bundle designs to minimize exchanger height and weight, stainless steel shell for higher shell side design pressures, and more traditional two or three bundle configurations to increase process efficiency or recover refrigerants and produce LPG products from lean feed gas streams. There are various exchanger and compressor configurations available to meet specific client needs.
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