Effect of methane reforming before combustion on emission and calorimetric characteristics of its combustion process

TY - JOUR

T1 - Effect of methane reforming before combustion on emission and calorimetric characteristics of its combustion process

AU - Karpilov, Igor

AU - Pashchenko, Dmitry

N1 - Publisher Copyright: © 2021 Hydrogen Energy Publications LLC

PY - 2021/11/3

Y1 - 2021/11/3

N2 - In this study, combustion and emission characteristics of methane mixed with steam (CH4/H2O) and the products of methane reforming with steam (CO/H2/H2O) were compared. Four fuel compositions were analysed: CH4+H2O, CH4+2H2O, and products of complete methane reforming in these mixtures, respectively. A comparison was carried out through the numerical model created via Ansys Fluent 2019 R2. A combustion process was simulated using a non-premixed combustion model, standard k-ϵ turbulence model and P-1 radiation model. The combustor heat capacity for interrelated fuel compositions was kept constant due to air preheating before combustion. The inlet air temperature was varied to gain a better insight into the combustion behaviour at elevated temperatures. The effect of steam addition on the emission characteristics and flame temperatures was also evaluated. NOx formation was assessed on the outlet of the combustion zone. The obtained results indicate that syngas has a higher combustion temperature than methane (in the same combustor heat capacity) and therefore emitted 27% more NOx comparing to methane combustion. With the air inlet temperature increment, the pollutant concentration difference between the two cases decreased. Steam addition to fuel inlet resulted in lesser emissions both for methane and syngas by 57% and 28%, respectively. In summary, syngas combustion occurred at higher temperature and produced more NOx emissions in all cases considered.

AB - In this study, combustion and emission characteristics of methane mixed with steam (CH4/H2O) and the products of methane reforming with steam (CO/H2/H2O) were compared. Four fuel compositions were analysed: CH4+H2O, CH4+2H2O, and products of complete methane reforming in these mixtures, respectively. A comparison was carried out through the numerical model created via Ansys Fluent 2019 R2. A combustion process was simulated using a non-premixed combustion model, standard k-ϵ turbulence model and P-1 radiation model. The combustor heat capacity for interrelated fuel compositions was kept constant due to air preheating before combustion. The inlet air temperature was varied to gain a better insight into the combustion behaviour at elevated temperatures. The effect of steam addition on the emission characteristics and flame temperatures was also evaluated. NOx formation was assessed on the outlet of the combustion zone. The obtained results indicate that syngas has a higher combustion temperature than methane (in the same combustor heat capacity) and therefore emitted 27% more NOx comparing to methane combustion. With the air inlet temperature increment, the pollutant concentration difference between the two cases decreased. Steam addition to fuel inlet resulted in lesser emissions both for methane and syngas by 57% and 28%, respectively. In summary, syngas combustion occurred at higher temperature and produced more NOx emissions in all cases considered.

KW - Flame

KW - Hydrogen

KW - Methane

KW - NO emission

KW - Reforming

UR - http://www.scopus.com/inward/record.url?scp=85115804571&partnerID=8YFLogxK

U2 - 10.1016/j.ijhydene.2021.09.043

DO - 10.1016/j.ijhydene.2021.09.043

M3 - 文章

AN - SCOPUS:85115804571

SN - 0360-3199

VL - 46

SP - 38106

EP - 38118

JO - International Journal of Hydrogen Energy

JF - International Journal of Hydrogen Energy

IS - 76

ER -