Download PDF by Vikram (vikram@betaala.com): Integrated Chemical Processes

By Vikram (vikram@betaala.com)

ISBN-10: 3527284583

ISBN-13: 9783527284580

ISBN-10: 3527302778

ISBN-13: 9783527302772

ISBN-10: 3527305793

ISBN-13: 9783527305797

ISBN-10: 3527306072

ISBN-13: 9783527306077

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Sample text

In contrast to this, the counter-cocurrent concept features only thermal interaction between the process streams localized in the reactor stage. 1, equality of the heat capacity fluxes in the heat recovery sections is a crucial condition for efficient heat recovery. This condition is inherently fulfilled by the simultaneous and the counter-cocurrent concept. In the asymmetric concept the flow rates of the process streams must be adjusted accordingly. The requirement of equal heat capacity fluxes cannot be fulfilled in the symmetric concept due to the continuous side stream addition.

Methanol reforming) or in processes without feed preheating, hydrogen is required to stabilize the ignited state of the catalytic combustion [47, 48]. However, the presence of hydrogen is extremely critical at high temperatures due to the ignition of homogeneous combustion. The use of less-reactive pure methane is recommended in this case, in order to avoid runaway [49]. Additionally, countercurrent flow of the reforming and the combustion gas gives rise to separation of the reaction zones and to runaway of the combustion reaction.

The behavior of the coupled system has been analyzed in Ref. [37]. Flowsheet of the FLOX-reformer. The triangles indicate the exchanged heat fluxes between different stages of the process [34]. Fig. 22. fm Page 32 Friday, February 25, 2005 7:01 PM 32 1 Enhancing Productivity and Thermal Efficiency of High-Temperature Endothermic Processes One major conclusion of this study is that integrated heat recovery reduces the sensitivity of the process against fluctuations of the operating parameters, and thus enhances the feasible operation range.

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Integrated Chemical Processes by Vikram (vikram@betaala.com)


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