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Bifurcation and its implications for a novel autothermal circulating fluidized bed membrane reformer for the efficient pure hydrogen production

机译：分叉及其对高效生产纯氢气的新型自热循环流化床膜重整器的意义

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摘要

The present investigation is a prelude to the experimental exploration of Static Bifurcation Behavior (SBB) in a novel Autothermal Circulating Fluidized Bed Membrane Reformer (ACFBMR) for pure hydrogen production by steam reforming of heavy hydrocarbons. Important impacts of a wide range of design and operating parameters on the reformer performance are explored with two reformer configurations. One is with the catalyst regeneration before the gas-solid separation and another is with the catalyst regeneration after the gas-solid separation. For both configurations there are three steady states (multiplicity of the steady states, static bifurcation behavior). The system behavior in the bifurcation region is quite complex and defies the simple logic of non-autothermal processes. For the first configuration, on the branch of upper temperature steady state the carbon formation and deposition on the nickel catalyst is highest, while the net hydrogen yield is highest on the branch of lower temperature steady state. For the second configuration, the conversion of heptane is always 100%. In the multiplicity region, the order of net hydrogen yield from high to low is the middle, upper and lower temperature steady states, while the order of reformer exit carbon flow rate from high to low is the lower, middle and upper temperature steady states. Efficient production of pure hydrogen for fuel cells requires fundamental and practical understanding of their bifurcation behaviors. (c) 2005 Elsevier Ltd. All rights reserved.
机译：本研究是在新型自热循环流化床膜重整器（ACFBMR）中通过重整烃的蒸汽重整生产纯氢的静态分叉行为（SBB）的实验探索的前奏。通过两种重整器配置，探索了广泛的设计和操作参数对重整器性能的重要影响。一种是气固分离前的催化剂再生，另一种是气固分离后的催化剂再生。对于这两种配置，都有三个稳态（稳态的多重性，静态分叉行为）。分叉区域中的系统行为非常复杂，并且违反了非自热过程的简单逻辑。对于第一种配置，在较高温度稳态的分支上，碳的形成和沉积在镍催化剂上最高，而净氢产率在较低温度稳态的分支上最高。对于第二种配置，庚烷的转化率始终为100％。在多样性区域，净氢产量从高到低的顺序是中，上，下温度稳态，而重整器出口碳流量从高到低的顺序是下，中，上温度稳态。高效生产用于燃料电池的纯氢需要对其分叉行为有基本的和实际的了解。 （c）2005 Elsevier Ltd.保留所有权利。

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