Initiation Characteristics of Rotating Supersonic Combustion Engine

Mazlan, Muhammad Amri; Yasin, Mohd Fairus Mohd; Saat, Ahmad; Wahid, Mazlan Abdul; Ghazali, Ahmad Dairobi; Rahman, Mohammad Nurizat

doi:10.5109/4372275

Cited by 4 publications

(2 citation statements)

References 25 publications

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“…As a result, it can help with combustion tuning for actual H 2 -NG co-firing in power plants. CFD has been used extensively to investigate flow dynamics, heat transmission, and combustion qualities [17][18][19][20][21]. As a result, a detailed Large Eddy Simulation (LES) was used in this study to investigate the effects of H 2 -NG co-firing on CRZs, combustion properties, and CIVB flashback risks in a pilot-scale swirl burner facility.…”

Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Hydrogen/Natural Gas/Air Premixed Swirling Flames and CIVB Flashback Risks

Mohammad Nurizat Rahman,

Suzana Yusup

2023

CFDL

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The desire to develop gas turbines (GTs) that can utilise natural gas (NG) blended with hydrogen (H2) often encounters operability challenges related to combustion-induced vortex breakdown (CIVB) flashback issues. Hence, a detailed Large Eddy Simulation (LES) was employed in this study to examine the impact of H2-NG co-firing on central recirculation zones (CRZs), combustion properties, and the risk of CIVB flashback in a pilot-scale swirl burner facility. The LES model successfully replicated the swirling component of the flame observed in the experiment with reasonable accuracy. The findings revealed that the introduction of H2 into the burner increased the velocity and temperature of the burned gases. The higher reactivity of H2 resulted in faster burning rates and a shift in the reaction zone, indicating that NG-H2 firing burns more rapidly than pure NG firing. Additionally, H2 was found to enhance the velocity gradient, pushing the CRZ upstream. Changes in the location of the CRZ can disrupt density and velocity gradients, affecting the generation of vorticity by the baroclinic torque and potentially increasing negative axial velocity, thereby increasing the risk of CIVB flashback. Further research is necessary to comprehensively assess the CIVB flashback risk, particularly when the proportion of H2 exceeds 30 %.

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Section: Introductionmentioning

confidence: 99%

Large Eddy Simulation of Hydrogen/Natural Gas/Air Premixed Swirling Flames and CIVB Flashback Risks

Mohammad Nurizat Rahman,

Suzana Yusup

2023

CFDL

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“…Another approach that has the potential to be a dependable and cost-effective strategy in the investigation of OPWs co-firing is numerical modelling (computational fluid dynamics). Numerical modelling has been shown to be an effective technique for diagnosing and resolving flow and combustion issues [24,[26][27][28][29][30][31]. As it can provide insights into the combustion properties of unfamiliar solid fuel blends [6,24], such as OPWs co-firing, it has been widely used to examine the combustion performance of a single coal and multiple solid fuel blends in bench-pilots and full-scale utility furnaces.…”

Section: Introductionmentioning

confidence: 99%

Oil Palm Wastes Co-firing in an Opposed Firing 500 MW Utility Boiler: A Numerical Analysis

Rahman

Yusup

Chin

et al. 2023

CFDL

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Malaysia is rich in palm oil plantations, where oil palm wastes (OPWs) are one of the readily accessible biomass resources. OPWs has the potential to be used as a fuel for electricity generation. Hence, the evaluation of OPWs co-firing for one of Malaysia's 500 MW utility boilers was executed numerically. Three types of OPWs were tested including empty fruit bunches (EFB), palm kernel shell (PKS), and palm mesocarp fibres (PMF). The predicted furnace exit gas temperature (FEGT) from the numerical model was validated against the actual FEGT from the power plant where the current boiler is situated, revealing a difference of less than 10%. The nose area temperature was predicted to exceed the cap of 1200°C in OPWs co-firing cases due to higher volatile matter (VM) in OPWs than the baseline of pure coal case, leading to higher levels of volatile release. When co-firing with OPWs, the predicted unburned carbon (UBC) at the boiler's outlet is lower because OPWs-coal blends contain less fixed carbon (FC) than the pure coal blend. UBC levels were anticipated to be lower than the loss of ignition (LOI) limit in all cases, highlighting its positive impact on carbon reduction. Slightly lowered mill performance was observed as a result of the calculated OPWs fuel flow surpassing the normal operation in the power plant to make up for the low gross calorific value (GCV) of OPWs while meeting the required load from the boiler. OPWs co-firing was predicted to emit lower carbon monoxide (CO) and carbon dioxide (CO2) than baseline coal due to lower FC. Nonetheless, higher thermal nitrogen oxides (NOx) were predicted due to the higher flame temperature created by OPWs co-firing. Even so, it is recommended that the ash mineral composition be included in future numerical studies since the ash minerals may have an effect on the emitted NOx.

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A single-step chemistry mechanism for biogas supersonic combustion velocity with nitrogen dilution

Rahman

Ujir

Wahid

et al. 2022

J Therm Anal Calorim

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Initiation Characteristics of Rotating Supersonic Combustion Engine

Cited by 4 publications

References 25 publications

Large Eddy Simulation of Hydrogen/Natural Gas/Air Premixed Swirling Flames and CIVB Flashback Risks

Large Eddy Simulation of Hydrogen/Natural Gas/Air Premixed Swirling Flames and CIVB Flashback Risks

Oil Palm Wastes Co-firing in an Opposed Firing 500 MW Utility Boiler: A Numerical Analysis

A single-step chemistry mechanism for biogas supersonic combustion velocity with nitrogen dilution

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