Fixed-Bed Reactors

Eigenberger, Gerhart

doi:10.1002/14356007.b04_199

Cited by 33 publications

(23 citation statements)

References 37 publications

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“…As described above, the RFR principle is based on the idea of integrating sensible heat released by an exothermic reaction to increase catalyst temperatures. Although in the “classical” application of the RFR for waste gas combustion, this heat integration thus allows autothermal reactor operation, even for gas mixtures with an extremely low adiabatic temperature increase (down to Δ T ∼ 15 K),26 in the current system the result of the heat integration is quite different: the additional heat fed back to the system is (to some extent) converted into chemical energy, as observed in the form of an increase in syngas yields rather than increased reactor temperatures. However, because of heat losses and both reactor and kinetic limitations, not all of the sensible heat is eventually converted into chemical energy.…”

Section: Discussionmentioning

confidence: 99%

Catalytic partial oxidation of methane in a high‐temperature reverse‐flow reactor

Neumann

Veser

2004

AIChE Journal

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Section: Discussionmentioning

confidence: 99%

Catalytic partial oxidation of methane in a high‐temperature reverse‐flow reactor

Neumann

Veser

2004

AIChE Journal

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“…This was used as the basis for setting the bounds on the particle size. Most fixed-bed reactors are known to have h rct / D rct ratios in the range 1–3 . Accordingly, with a 20% margin, the lower limit of 0.8 was imposed on the reactor.…”

Section: Methodsmentioning

confidence: 99%

Dynamic Modeling and Optimization of a Fixed-Bed Reactor for the Partial Water–Gas Shift Reaction

Kherdekar

Roy

Bhatia

2021

Ind. Eng. Chem. Res.

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This work presents an approach for the model-based design of a load-flexible fixed-bed reactor for performing the partial water–gas shift (WGS) reaction in the gas cleanup section of a coal-to-methanol plant. Three optimization problems with various combinations of objective functions (H2/CO ratio, pressure drop, and operating costs) are formulated and solved using the nondominated sorting genetic algorithm (NSGA-II) to obtain the Pareto-optimal fronts, and the selected solutions are subjected to dynamic stability analysis. The optimum values of decision variables such as the weight of the catalyst, catalyst particle size, ratio of the reactor length and diameter, feed gas temperature, and steam to CO ratio are estimated and are found to be dependent on the choice of the objectives and tolerable deviation from their required values. The dependence of the H2/CO ratio on the inlet gas temperature varies with the choice and combination of the objectives. In contrast, higher values of the steam to CO ratio (S/C) are associated with a lower deviation from the desired H2/CO ratio for all three cases. However, optimum values of S/C are found to be below 1:1 because of its effect on the pressure drop and operating costs. The solutions obtained in the equilibrium-limited regime are found to be more stable in the presence of fluctuations in the feed flow rates but show intermediate stability with fluctuations in the inlet gas temperature. Four designs are recommended as the feasible designs, and the criteria of their application are discussed. Even though the work is related to a WGS reactor, the methodology used can be applied for the design of any other reactor system operating under variable feed conditions.

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“…Diverse reactor models of different complexity are reported in the literature to describe each reaction step of the Ca-Cu looping process. Fernández et al (2012b) defined a preliminary design of the Ca-Cu process using a quite simple reactor model based on plug flow mode operation, in which steep reaction and heat exchange fronts were assumed, following an early approach by Noorman et al (2007) and Eigenberger (2012) for packed bed chemical looping combustion reactors. This model approach served to define the operating conditions for every stage of the process (i.e., temperature, pressure, steam-tocarbon (S/C) ratio, etc).…”

Section: Reactor Modellingmentioning

confidence: 99%

Recent progress of the Ca-Cu technology for decarbonisation of power plants and carbon intensive industries

Martínez

Fernández

Martini

et al. 2019

International Journal of Greenhouse Gas Control

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Fixed-Bed Reactors

Cited by 33 publications

References 37 publications

Catalytic partial oxidation of methane in a high‐temperature reverse‐flow reactor

Catalytic partial oxidation of methane in a high‐temperature reverse‐flow reactor

Dynamic Modeling and Optimization of a Fixed-Bed Reactor for the Partial Water–Gas Shift Reaction

Recent progress of the Ca-Cu technology for decarbonisation of power plants and carbon intensive industries

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