The effect of pre-heating and dilution level on the combustion field and flue gas composition of an oxy-MILD combustion system in a laboratory-scale furnace

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Moghadasi Mohamad Hassan; RIAZI ROUZBEH; TABEJAMAAT SADEGH; MARDANI AMIR

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Journal: FUEL AND COMBUSTION Year:2019 | Volume:12 | Issue:3 Page(s): 53-71

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Title

The effect of pre-heating and dilution level on the combustion field and flue gas composition of an oxy-MILD combustion system in a laboratory-scale furnace

Author(s)

Moghadasi Mohamad Hassan | RIAZI ROUZBEH | TABEJAMAAT SADEGH | MARDANI AMIR | Issue Writer Certificate

Keywords

Oxy-combustionQ1

MILD combustionQ2

CO2 dilutionQ1

Numerical analysisQ2

Abstract

In this study, Oxy-combustion is numerically investigated under MILD conditions. This novel combination is simulated in a laboratory-scale furnace with parallel fuel and oxidant jets and a recirculating flow. With nitrogen removal from the oxidant stream, zero NOx emission for gaseous fuel systems is expected. Combustion field is modelled using a well-stirred reactor and computational fluid dynamics. In the CFD modelling, RANS equations are solved using the RNG k-ε and EDC model is employed to model the turbulence-chemistry interaction. The effect of oxidizer preheating and CO2 dilution on the combustion field as well as flue gas composition is investigated. The results indicate that the maximum flame temperature does not experience a significant increase when the preheat temperature rises, positively affecting the temperature distribution at the cost of CO emission which is a direct consequence of higher recirculation and mixing rate. Also, a kinetic study on the chemical effect of CO2 presence reveals that CO production path through CH3O radical is more strengthened compared to the main path through formaldehyde when increasing the dilution level. When diluting the oxidant, methylene’ s role becomes more influential in CO formation than when pure oxygen is used, contributing to higher CO emission. CO2 defeats CH4 and O2 to absorb the free H radicals, causing higher levels of CO production.

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APA: Copy

Moghadasi, Mohamad Hassan, RIAZI, ROUZBEH, TABEJAMAAT, SADEGH, & MARDANI, AMIR. (2019). The effect of pre-heating and dilution level on the combustion field and flue gas composition of an oxy-MILD combustion system in a laboratory-scale furnace. FUEL AND COMBUSTION, 12(3 ), 53-71. SID. https://sid.ir/paper/138561/en

Vancouver: Copy

Moghadasi Mohamad Hassan, RIAZI ROUZBEH, TABEJAMAAT SADEGH, MARDANI AMIR. The effect of pre-heating and dilution level on the combustion field and flue gas composition of an oxy-MILD combustion system in a laboratory-scale furnace. FUEL AND COMBUSTION[Internet]. 2019;12(3 ):53-71. Available from: https://sid.ir/paper/138561/en

IEEE: Copy

Mohamad Hassan Moghadasi, ROUZBEH RIAZI, SADEGH TABEJAMAAT, and AMIR MARDANI, “The effect of pre-heating and dilution level on the combustion field and flue gas composition of an oxy-MILD combustion system in a laboratory-scale furnace,” FUEL AND COMBUSTION, vol. 12, no. 3 , pp. 53–71, 2019, [Online]. Available: https://sid.ir/paper/138561/en

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