Thermally integrated microreactor for Sabatier reaction: Study of air-cooled and inert-diluted counter-current operation strategies

Raghu, Aswathy K.; Kaisare, Niket S.

doi:10.1016/j.cattod.2020.08.025

Cited by 11 publications

(10 citation statements)

References 42 publications

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“…Temperature and mass fraction contours of CO 2 in the spiral microreactor at the base case inlet conditions is shown in Figure 3. The maximum temperature attained is 784 K, which is considerably lower than what is observed in U‐bend reactor where it is 852 K. In our previous work, feed dilution with up to 20% nitrogen was used for U‐bend 21 and counter‐current reactors 22 ; with other conditions similar to the base case, maximum temperatures of 830 K and 824 K were observed, respectively. In comparison, the overall lowering of maximum temperature in the spiral reactor is due to the compact geometry of the reactor which provides high internal heat transfer area to external heat loss area.…”

Section: Resultsmentioning

confidence: 74%

“…The kinetics was originally developed for both reforming and methanation reactions, and is valid for CO 2 methanation 21,22 . The reaction rates for the three reactions are given as:

r_{1} goodbreak= goodbreak- \frac{k_{1}}{p_{H_{2}}^{2.5}} \frac{p_{{CH}_{4}} p_{H_{2} normalO} - \frac{p_{{normalH}_{2}}^{3} p_{CO}}{K_{1}}}{{((), Den ((), T))}^{2}}

r_{2} goodbreak= goodbreak- \frac{k_{2}}{p_{H_{2}}} \frac{p_{CO} p_{H_{2} normalO} - \frac{p_{{normalH}_{2}} p_{normalC O_{2}}}{K_{2}}}{{((), Den ((), T))}^{2}}

r_{3} goodbreak= goodbreak- \frac{k_{3}}{p_{H_{2}}^{3.5}} \frac{p_{{CH}_{4}} p_{H_{2} normalO}^{2} - \frac{p_{{normalH}_{2}}^{4} p_{normalC O_{2}}}{K_{3}}}{{((), Den ((), T))}^{2}}

where,

K_{1} = K_{3} / K_{2}

K_{2} goodbreak= 0.03163 \exp ((), \frac{4.003 \times 10^{5}}{T^{2}} goodbreak+ \frac{3.415 \times 10^{3}}{T}),

\frac{1}{}

…”

Section: Methodsmentioning

confidence: 99%

“…The kinetics was originally developed for both reforming and methanation reactions, and is valid for CO 2 methanation. 21,22 The reaction rates for the three reactions are given as:…”

Section: Reaction Kineticsmentioning

confidence: 99%

“…Moreover, they have large surface area to volume ratio that enables high mass and heat transfer rates, which is advantageous for conducting exothermic reactions with thermal integration 20 . We have computationally analyzed several operation strategies for Sabatier reaction in thermally integrated microreactors with heat recirculation 21,22 …”

Section: Introductionmentioning

confidence: 99%

“…20 We have computationally analyzed several operation strategies for Sabatier reaction in thermally integrated microreactors with heat recirculation. 21,22 Popular designs reported for heat recovery (both recuperative and regenerative) have flow in counter-current direction. 23 Heat transfer between hot products and cold inlet feed in counter-current direction can promote autothermal reaction operation with high efficiency.…”

mentioning

confidence: 99%

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A compact heat recirculating spiral geometry for thermal integration for Sabatier reaction in microreactor

Raghu

Kaisare

2022

AIChE Journal

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Sabatier reaction, the catalytic reduction of CO 2 to methane, is a reversible and exothermic reaction that produces CO as a by-product. We use two-dimensional computational fluid dynamics (CFD) simulations to analyze the performance of a three-turn spiral microreactor, useful for portable or modular applications. Spiral reactor has inlet at the center followed by three turns that spirals outwards. It allows thermal integration via cocurrent self-coupling of Sabatier reaction, which enables utilizing the exothermic heat of methanation for preheating of the cold reactants by hot products. Due to compact nature of the geometry, heat released spreads out in the reactor causing an overall moderation of temperature. A favorable cooling effect is achieved in spiral geometry without using external cooling or feed dilution, merely by the property of reactor configuration.

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Section: Resultsmentioning

confidence: 74%

“…The kinetics was originally developed for both reforming and methanation reactions, and is valid for CO 2 methanation 21,22 . The reaction rates for the three reactions are given as:

r_{1} goodbreak= goodbreak- \frac{k_{1}}{p_{H_{2}}^{2.5}} \frac{p_{{CH}_{4}} p_{H_{2} normalO} - \frac{p_{{normalH}_{2}}^{3} p_{CO}}{K_{1}}}{{((), Den ((), T))}^{2}}

r_{2} goodbreak= goodbreak- \frac{k_{2}}{p_{H_{2}}} \frac{p_{CO} p_{H_{2} normalO} - \frac{p_{{normalH}_{2}} p_{normalC O_{2}}}{K_{2}}}{{((), Den ((), T))}^{2}}

r_{3} goodbreak= goodbreak- \frac{k_{3}}{p_{H_{2}}^{3.5}} \frac{p_{{CH}_{4}} p_{H_{2} normalO}^{2} - \frac{p_{{normalH}_{2}}^{4} p_{normalC O_{2}}}{K_{3}}}{{((), Den ((), T))}^{2}}

where,

K_{1} = K_{3} / K_{2}

K_{2} goodbreak= 0.03163 \exp ((), \frac{4.003 \times 10^{5}}{T^{2}} goodbreak+ \frac{3.415 \times 10^{3}}{T}),

\frac{1}{}

…”

Section: Methodsmentioning

confidence: 99%

“…The kinetics was originally developed for both reforming and methanation reactions, and is valid for CO 2 methanation. 21,22 The reaction rates for the three reactions are given as:…”

Section: Reaction Kineticsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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