Heat Transport in a Wall Heated Tubular Packed Bed Reactor at Elevated Pressures and Temperatures

Borman, P.C.; Borkink, J.G.H.; Westerterp, K.R.

doi:10.1080/00986449208936014

Cited by 18 publications

(15 citation statements)

References 24 publications

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“…Superficial gas velocities higher than 0.5 m/s also lead to a high turbulent regime and therefore high mass and heat transfer coefficients between gas and solids can be assumed. Using the physical properties and operating conditions presented in Table 2 and Table 3, a gas-solid heat transfer coefficient (h fs ) of about 0.13 kW/m 2 K is obtained (Dixon, 1979;Borman et al, 1992). This value implies a very fast gas-solid transfer with no appreciable difference between the gas and solid temperatures at any point in the reactor.…”

Section: Mathematical Model Descriptionmentioning

confidence: 97%

Modeling of sorption enhanced steam methane reforming in an adiabatic fixed bed reactor

Fernández

Abanades

Murillo

2012

Chemical Engineering Science

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Sorption enhanced methane reforming (SER), employing a CaO-based solid as a high temperature CO 2 sorbent, is generally considered to be a promising route for H 2 production. In this paper we present a dynamic pseudo-homogeneous model to describe the operation of a packed bed reactor in which the SER reaction is carried out under adiabatic conditions. This reactor can be implemented according to several process schemes, including a novel Ca/Cu looping process for hydrogen generation with inherent CO 2 capture. The proposed SER model is based on the well-established principles of gas-solid contact and heat transfer in fixed-bed reactors and on the kinetic expressions published in the literature that describe the main reactions involved in the process. The resulting model describes the transient performance of the SER reaction and confirms the theoretical viability of this critical reaction stage in a large scale H 2 production facility. It is demonstrated that the SER process can yield a CH 4 conversion 2 and H 2 purity of up to 85% and 95%, respectively, under operating conditions of 923 K, 3.5 MPa, a steam/carbon ratio of 5 and a space velocity of 3.5 kg/m 2 s.

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Section: Mathematical Model Descriptionmentioning

confidence: 97%

Modeling of sorption enhanced steam methane reforming in an adiabatic fixed bed reactor

Fernández

Abanades

Murillo

2012

Chemical Engineering Science

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“…In addition, when the reactions involved are not thermally neutral and/or when the temperatures of the gases and the solids in contact are different, a heat exchange front is also established, moving like a plug flow through the fixed bed as the reaction time increases. Numerous correlations for estimating the fluid-solid heat transfer coefficient (h fs ) have been mentioned in the literature (Holman, 1976;Dixon, 1979;Borman et al, 1992). All of them predict for the high superficial velocities employed in this stage (around 2 m/s) a fast gas-solid heat transfer.…”

Section: Basic Reactor Designmentioning

confidence: 99%

Conceptual design of a hydrogen production process from natural gas with CO2 capture using a Ca–Cu chemical loop

Fernández

Abanades

Murillo

et al. 2012

International Journal of Greenhouse Gas Control

122

165

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a b s t r a c tThis work presents a conceptual design of a novel method to obtain hydrogen and/or electricity from natural gas and a concentrated stream of CO 2 suitable for permanent geological storage. The method is based on the well known Sorption Enhanced Reforming (SER) principles for H 2 production using a CaO/CaCO 3 chemical loop. A second chemical loop of Cu/CuO is employed to solve the problem of endothermic CaCO 3 calcination in order to regenerate the sorbent and release the concentrated CO 2 . The reduction reaction of CuO with natural gas, CO or H 2 is shown to be feasible for providing the necessary heat for calcination. A preliminary design of the process has been carried out based on the principles of fixed bed operation and high temperature PSA, making use of the information offered by the literature to define the operating best conditions for the key gas-solid reaction steps and assuming ideal plug flow behaviour in all the reactors during the chemical reactions and gas-solid heat transfer. This makes it possible to define the precise operating windows for the process, so that the reactors can operate close to neutrally thermal conditions. Special material properties (particularly the Ca/inert and Cu/inert ratios) are required, but these are shown to be within the limits of what have been reported in the literature for other gas/solid reaction processes using the same reactions. The conclusion is that there is a great potential for achieving a high degree of energy efficiency with the proposed process by means of a sequence of reactions under the conditions described in this work.

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“…The experiments were compared to model calculations performed with a pseudo-homogeneous two dimensional model. Using the above mentioned kinetic relations and separately determined heat transfer parameters, see Borman et al (1992), only a fair agreement could be obtained between the measured and experimental temperature profiles. Though no final reason can be given yet, we feel the poor model description is due to inaccuracies in the kinetic relations.…”

Section: The Experimental Apparatusmentioning

confidence: 98%

“…Experiments were performed in a bed with a length of 0.45 m and a diameter of 53 mm, see Borman et al (1992), packed with ring shaped catalyst particles of d *,=6.2 mm. The walI of the reactor is cooled externally with pressurized boiling water.…”

Section: The Experimental Apparatusmentioning

confidence: 99%

An experimental study of the selective oxidation of ethene in a wall cooled tubular packed bed reactor

Borman

Westerterp

1992

Chemical Engineering Science

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The selective oxidation of ethene over a silver on o-alumina catalyst was studied in a wall cooled tubular reactor. Temperatures were measured inside the bed at different axial and radial positions as well as the overall conversion and selectivity. Locally measured temperatures vary after repacking the bed whereas the global properties do not vary. Angular variations in temperature cannot be described by present day models. The steady state temperature profiles in the packed bed and overall conversion and selectivity as function of different operating conditions are discussed.

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Heat Transport in a Wall Heated Tubular Packed Bed Reactor at Elevated Pressures and Temperatures

Cited by 18 publications

References 24 publications

Modeling of sorption enhanced steam methane reforming in an adiabatic fixed bed reactor

Modeling of sorption enhanced steam methane reforming in an adiabatic fixed bed reactor

Conceptual design of a hydrogen production process from natural gas with CO2 capture using a Ca–Cu chemical loop

An experimental study of the selective oxidation of ethene in a wall cooled tubular packed bed reactor

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