Ammonia as a Hydrogen Vector: Validated Large Eddy Simulation of Ammonia Co-Firing in a Pilot-Scale Coal Combustor

Rahman, Mohammad Nurizat; Samsuri, Muhamad Shazarizul Haziq Mohd; Yusup, Suzana; Shariff, Ismail

doi:10.1007/978-981-99-0859-2_18

Cited by 2 publications

(2 citation statements)

References 26 publications

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“…To improve fuel flexibility and reduce emissions, a variety of combustion solutions have been proposed or implemented in coalfired thermal power plants. The two most common combustion solutions are solid fuel blending and, more recently, co-firing with green fuels (hydrogen, ammonia, biomass) [20][21].…”

Section: Pre-qualification Of Solid Fuels For Thermal Power Plants In...mentioning

confidence: 99%

Techno-economic Analysis of a Solid Fuel Testing Facility for Thermal Power Plants in Peninsular Malaysia: A Monte Carlo Approach

Mohammad Nurizat Rahman

2023

ARASET

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Coal-fired thermal power plants in Peninsular Malaysia are expected to remain operational for at least another 20 years, highlighting the need for clean coal technology adoption. The introduction of new coal types necessitates the verification of their technical viability prior to adoption into power plants, which is addressed by the proposed Solid Fuel Testing Facility (SFTF) system. Hence, this study developed a Monte Carlo-based model to examine the economic factors influencing the profitability of the SFTF system as a solid fuel pre-qualification assessment tool. Three critical factors have been identified as contributors to the SFTF system's economic viability uncertainty: the Test Number, Power Purchase Agreements (PPA) Reduction, and Test Cost. In terms of Net Present Value (NPV) valuation, the Test Number has the highest sensitivity. The projected increase in coal demand necessitating the inclusion of a broader spectrum of new coal variants in power plant operations. As a result, the possibility of an expanded Test Number for the SFTF system exists until the PPA's tenure expires. Therefore, the possibility of favourable NPV outcomes remains prominent throughout the term of the PPA. In contrast, the PPA Reduction has the lowest susceptibility to NPV sensitivity. This demonstrates the SFTF system's ability to navigate policy shifts related to PPA tenure reductions, albeit within a range of 3 to 4 years of reduction. It is suggested that a broader range of parameters be considered in order to gain a more holistic understanding of the economic viability of the proposed SFTF system.

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Section: Pre-qualification Of Solid Fuels For Thermal Power Plants In...mentioning

confidence: 99%

Techno-economic Analysis of a Solid Fuel Testing Facility for Thermal Power Plants in Peninsular Malaysia: A Monte Carlo Approach

Mohammad Nurizat Rahman

2023

ARASET

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“…In light of this, the hydrogen (H 2 ) co-firing approach in the GT power plants is undeniably practical and desirable [2,3]. This is due to the fact that co-firing maximises the use of already-existing infrastructure in the numerous GT power plants, reducing resource waste and financial loss due to the early retirement of power plants [4][5][6]. Additionally, merely lowering the amount of carbon in the fuel stream could contribute to a rapid reduction in carbon dioxide (CO 2 ) emissions [7].…”

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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Ammonia as a Hydrogen Vector: Validated Large Eddy Simulation of Ammonia Co-Firing in a Pilot-Scale Coal Combustor

Cited by 2 publications

References 26 publications

Techno-economic Analysis of a Solid Fuel Testing Facility for Thermal Power Plants in Peninsular Malaysia: A Monte Carlo Approach

Techno-economic Analysis of a Solid Fuel Testing Facility for Thermal Power Plants in Peninsular Malaysia: A Monte Carlo Approach

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

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