Industrial Gases Processing by Heinz-Wolfgang Häring, Christine Ahner, Aldo Belloni

By Heinz-Wolfgang Häring, Christine Ahner, Aldo Belloni

Commercial gases became over a interval of greater than a century ubiquitous components of our day-by-day actions, e.g. steel fabrication, metallurgy, petrochemicals, foodstuff processing, healthcare, and plenty of extra.

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Therefore, the two curves may not intersect. The closer they lie together, the smaller the dT and the more exchanging surface is required in this area for the heat exchange. The Q-T-Diagram allows to judge the quality of the heat transfer: A transfer of heat dQ over a finite temperature difference dT is irreversible. e. 32]. This exergy loss must be compensated by extra work performed on one of the compressors. 2) Here, Ta is the ambient temperature to which the technical available work refers. From this equation one concludes that x the loss increases with the growing temperature difference dT x the loss is larger at low temperatures, owing to the factor T · T c in the denominator Comparison of Internal and External Compression The warm and cold branches of the Q-T-Diagram for internal compression, Fig.

4 Liquefiers There is a class of air separation units, specialized to deliver the products exclusively in liquid form. The liquid products are supplied to smaller gas consumers within the regional market via tank trucks. Usual capacities of such plants lie in the range of 3000–20 000 mN3 h–1 of cryogenic liquids. 2007 10:26:54 38 2 The Air Gases Nitrogen, Oxygen and Argon integrated into the air separation process or modularly designed as “stand alone unit”. 24]. 7 kWh mN–3 of the first air liquefiers built after 1895.

Most of the heat is contributed by the adsorbed water, whereas the CO2-adsorption heat hardly counts owing to the low CO2 content. 2–2 times higher than the H2O condensation heat, which is 1808 kJ mN–3. For this exemplary calculation an adsorption heat of 2680 kJ mN–3 is assumed. The adsorption heat of CO2 is ~ 2050 kJ mN–3. The water content of the saturated air at the molsieve inlet amounts to about 3000 ppm, the CO2-content to ~ 400 ppm. 27 MWh. The temperature profile of the regeneration gas leaving the molsieve adsorber (Fig.

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