Transient behaviour of an adiabatic fixed-bed methanator—I

Doesburg, H. Van

doi:10.1016/0009-2509(76)85007-5

Cited by 57 publications

(6 citation statements)

References 4 publications

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“…Importance of Dynamic Modeling of TBRs. The study of modeling and simulation of TBRs for HDT of oil fractions in dynamic conditions is of great interest for process and control engineers because of the following main reasons: (i) It becomes a tool for the design of new TBRs. (ii) Automation and optimizing control has been and continues to be introduced in the industry on an ever-increasing scale.…”

Section: Brief Literature Reviewmentioning

confidence: 99%

Dynamic Modeling and Simulation of Catalytic Hydrotreating Reactors

et al. 2006

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This paper describes a dynamic heterogeneous one-dimensional model of trickle-bed reactors used for catalytic hydrotreating of oil fractions. The model considers the main reactions in the hydrotreating process of oil fractions: hydrodesulfurization, hydrodenitrogenation, and hydrodearomatization. The dynamic model was first validated using experimental data obtained in an isothermal pilot reactor during hydrotreating of vacuum gas oil over a commercial NiMo catalyst. Then, the model was applied to predict the dynamic behavior of a commercial hydrotreating reactor. Changes in concentration, partial pressure, and temperature profiles are obtained and discussed as a function of reactor axial position and time. The simulations obtained with the proposed dynamic model showed good agreement with experimental data.

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Section: Brief Literature Reviewmentioning

confidence: 99%

Dynamic Modeling and Simulation of Catalytic Hydrotreating Reactors

et al. 2006

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“…Consequently, a front with an elevated reactant concentration reaches the hotter part of the reactor and a hot spot is formed by the heat release of the excess reactants . Applied to the unsteady‐state methanation, van Doesburg and de Jong as well as Try et al detected the wrong‐way behavior for changes of the inlet temperature. Similarly, Sun and Simakov reported moving thermal fronts propagating in the reactor.…”

Section: Introductionmentioning

confidence: 99%

Transient Flow Rate Ramps for Methanation of Carbon Dioxide in an Adiabatic Fixed‐Bed Recycle Reactor

2019

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The power‐to‐gas (PtG) process, enabling the long‐term indirect storage of electrical energy, includes the water electrolysis for hydrogen production and the subsequent hydrogenation of carbon dioxide in a methanation reactor. The dynamic operation of methanation reactors is favored to limit upstream storage capacities, but not fully understood thus far. Therefore, this contribution investigates the dynamic operation of a fixed‐bed recycle reactor during flow rate ramps with a variation of the ramp time. Load ramps of the volumetric flow rate lead to global maxima during the transition; for the methane content if the flow rate is decreased, and for the gas temperature if the flow rate is increased. Furthermore, the adaptation of the product recirculation during flow rate ramps is discussed at the end. The recycle ratio turns out to provide an additional degree of freedom for stabilizing the reactor behavior under fluctuating feed conditions.

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“…Experimentally, the wrong-way behavior was observed by Hoiberg, Lyche and Foss (1971), Van Doesburg and De Jong (1976) Sharma and Hughes (1979a, b) and LopeH z-Isunza (1983), among others. Under some circumstances this behavior can lead to undesired results, such as promotion of side reactions, catalyst deactivation and thermal runaway.…”

Section: Introductionmentioning

confidence: 82%

Start-up and wrong-way behavior in a tubular reactor: dilution effect of the catalytic bed

Quina

Quinta‐Ferreira

2000

Chemical Engineering Science

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The start-up and the wrong-way behavior of a "xed-bed reactor were analyzed through one-dimensional heterogeneous and pseudo-homogeneous models. The simulation work was based on the methanol oxidation to formaldehyde, which takes place in a "xed-bed reactor with two distinct zones. In the "rst part of the reactor, the catalyst was diluted with inert, and in the second zone the catalyst is pure. This activity pro"le leads to new features on the start-up and wrong-way behavior of the system when compared with a uniform catalytic bed. For a partially diluted bed, when the inlet temperature is increased (decreased), the "nal steady state can show a hot spot lower (higher) than the initial one. This behavior is not observed in a one-zone bed, where the "nal steady-state maximum temperature is always higher (lower) than the initial one if the inlet temperature is submitted to a positive (negative) change. During the dynamic period, the transient pro"les are closer to the initial steady states in the case of the two-zone bed, pointing out that the catalyst dilution in the upstream section of the reactor can decrease the system sensitivity in both steady state and dynamic period. The di!erences between the predictions obtained through the pseudo-homogeneous and the heterogeneous models can be more signi"cant on the transient responses than on the steady state situations and the wall temperature is the most important parameter on the reactor dynamic response. Moreover, signi"cant wrong-way behavior can occur for step changes and ramp variations in feed and wall temperatures.

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Transient behaviour of an adiabatic fixed-bed methanator—I

Cited by 57 publications

References 4 publications

Dynamic Modeling and Simulation of Catalytic Hydrotreating Reactors

Dynamic Modeling and Simulation of Catalytic Hydrotreating Reactors

Transient Flow Rate Ramps for Methanation of Carbon Dioxide in an Adiabatic Fixed‐Bed Recycle Reactor

Start-up and wrong-way behavior in a tubular reactor: dilution effect of the catalytic bed

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