Effect of hydrogen addition on the catalytic combustion of fuel-lean carbon monoxide-air mixtures over platinum for micro-scale power generation applications

• Autorzy: Chen J. , Yan L. , Song W. , Xu D.
• Języki publikacji: EN

Abstrakty

EN

The catalytic combustion of hydrogen and carbon monoxide over Pt/γ-Al2O3 catalyst was investigated numerically for H2/CO/O2/N2 mixtures with overall lean equivalence ratios ϕ = 0.117 .. 0.167, H2:CO molar ratios 1:1.5 .. 1:6, a pressure of 0.6 MPa, and a surface temperature range from 600 to 770 K relevant for micro-scale turbines and large gas turbine based power generation systems. Simulations were carried out with a two-dimensional CFD (Computational Fluid Dynamics) model in conjunction with detailed hetero-/homogeneous kinetic schemes and transports to explore the impact of hydrogen addition on catalytic combustion of carbon monoxide. The detailed reaction mechanisms were constructed by implementing recent updates to existing kinetic models. The simulation results indicated that the hydrogen addition kinetically promotes the catalytic combustion of carbon monoxide at wall temperatures as low as 600 K, whereby the catalytic reactions of hydrogen are fully lit-off and the conversion of carbon monoxide is mixed transport/kinetically controlled. Such a low temperature limit is of great interest to idling and part-load operation in large gas turbines and to normal operation for recuperative micro-scale turbine systems. Kinetic analysis demonstrated that the promoting impact of hydrogen addition on catalytic combustion of carbon monoxide is attributed to the indirect effect of hydrogen reactions on the surface species coverage, while direct coupling steps between hydrogen and carbon monoxide are of relatively minor importance. The added hydrogen inhibits the catalytic oxidation of carbon monoxide for wall temperatures below 520 K, which are well below the minimum inlet temperatures of reactants in micro-scale turbine based power generation systems.

Słowa kluczowe

EN

catalytic combustion; hydrogen promotion; carbon monoxide; synthesis gas; power generation system

PL

spalanie katalityczne; promocja wodoru; tlenek węgla; gaz syntezowy; system wytwarzania energii

• Wydawca: Institute of Heat Engineering, Warsaw University of Technology
• Czasopismo: Journal of Power Technologies
• Rocznik: 2018
• Tom: Vol. 98, nr 1
• Strony: 161--169
• Opis fizyczny: Bibliogr. 60 poz., rys., tab., wykr.

Twórcy

autor

Chen J.

• School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

autor

Yan L.

• School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

autor

Song W.

• School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

autor

Xu D.

• School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo 454000, Henan, China

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Uwagi

PL

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).