Advances in Cryogenic Engineering: Proceedings of the 1972. by A. Pastuhov (auth.), K. D. Timmerhaus (eds.) PDF

By A. Pastuhov (auth.), K. D. Timmerhaus (eds.)

ISBN-10: 1468431110

ISBN-13: 9781468431117

ISBN-10: 1468431137

ISBN-13: 9781468431131

The nationwide Bureau of criteria Boulder Laboratories at Boulder, Colorado once more served because the host for the 1972 Cryogenic Engineering convention. For the Cryogenic Engineering convention it used to be like coming horne, for it used to be on the NBS Boulder Laboratories that the Cryogenic Engineering convention used to be first conceived and held m 1954m reference to the commitment ofthe NBS Boulder Laboratories by way of President Dwight D. Eisenhower. The Cryogenic Engineering convention IS thankful for the continued aid that the nationwide Bureau of criteria has gIVen through the years, and which was once increased on July 1, 1971 whilst the NBS Boulder Laboratories assumed the secretariat functionality of the convention from the nationwide Academy of Sciences. as a result of universal pursuits in warmth move, the 1972 Cryogemc Engineering convention labored with the thirteenth nationwide warmth move convention to advance a joint application m warmth move. A majority ofthe papers awarded during this cooperative attempt are incIuded m V olume 18 of the Advances zn Cryogenic Engineerzng throughout the kmd permission ofthe thirteenth nationwide warmth move convention and are acknowl­ edged accordingly.

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Additional resources for Advances in Cryogenic Engineering: Proceedings of the 1972. Cryogenic Engineering Conference. National Bureau of Standards. Boulder, Colorado. August 9–11, 1972

Sample text

It is important, therefore, to determine the limits of feed composition variation and design the cryogenic exchangers accordingly. The design should be made with sufficient flexibility to anticipate future feed composition changes and normal day-to-day fluctuations, whether it be heavy or light components. For instance, a cryogenic process might be designed for a feed gas with a variable nitrogen content of up to 2 %. The higher nitrogen content will shift the condensing load to the cold er portion of the heat exchanger.

Note that ethane + y % n-butane means the mole ratio of ethane to n-butane is (1 - y) :y. The important point to note o .. Vapor • FIg. 4 Vapor explosIOn composltJonal envelope for methane + (ethane + I 6 % nbutane) + propane mIxtures Mole % EJlplos ion " No .. Vopor Eaplolion" Methone 38 T. Enger, D. E. Hartman, and E. V. Seymour Mol e o • Vopor • NO · Vopor E:Kplos i on " E :Kploslon • Fig 5. Vapor explosIOn composltlOnal envelope for methane + (ethane + 65% nbutane) + pro pa ne mixlUres • % Meth one IS that vapor explosions can only be produced when the amount of methane present in the mixture is less than 40 mol %, and that with a few per cent of n-butane present, vapm explosions cannot be obtained with propane in excess of 20 mol %.

At the higher concentration of acid gases, the dehydrator is preceded by an acid gas treater. In some cases, the gaseous contaminants may be present in the feed gas below the solubility limit of the final product. In this case, the contaminants do not freeze out dunng normal operation. Desiccants can be used which allow these compounds to pass through so long as the product specifications are not limiting. Even in these situations, some caution should be exercised. Most desiccants exhibit some surface adsorption, and following regeneration, high concentrations of these compounds for short periods at regular intervals may cause freezing in the exchanger.

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Advances in Cryogenic Engineering: Proceedings of the 1972. Cryogenic Engineering Conference. National Bureau of Standards. Boulder, Colorado. August 9–11, 1972 by A. Pastuhov (auth.), K. D. Timmerhaus (eds.)

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