Influence of furnace cross section on the flow and velocity distribution in tangential firing furnace

Zainudin, A. F.; Hasini, Hasril; Fadhil, Siti Sarah Ain

doi:10.1088/1742-6596/822/1/012031

Cited by 1 publication

(3 citation statements)

References 12 publications

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“…Where water molecule Coal particles are tracked through the Discrete Phase Model (DPM) and their diameter adopts the Rosin-Ramler distribution [16]. The blending of coal with NH 3 is simulated using two separate streams where coal is retained in solid form while NH 3 is injected in its gaseous form.…”

Section: Governing Equationsmentioning

confidence: 99%

“…t turbulent viscosity v: kinematic viscosity Radiation, identified as the primary mode of heat transfer in the furnace, is modelled using the P1 model, chosen for its reasonable accuracy in cases with large optical thickness and moderate computational cost [16]. In conjunction with the radiation model selection, the weighted-sum-of-gray-gases model (WSGGM) is employed to determine the emissivity of the flue gas.…”

Section: Governing Equationsmentioning

confidence: 99%

“…Additionally, flue gases closer to the furnace's circumference exhibited higher velocity, possibly indicating the presence of a tunnel-like velocity vortex [24]. Moreover, the firing angle of fuel and air into the furnace creates a central concentration, leading to the area around the furnace's core being characterized by hotter gases typically exhibiting high velocity [16].…”

Section: Flowmentioning

confidence: 99%

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Numerical analysis of flow and combustion of Coal-Ammonia blend in coal-fired furnace

Rekhraj,

Hasini

2024

Eng. Res. Express

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Co-firing ammonia (NH3) in coal-fired power plants presents an attractive method to expedite the global decarbonization process. Nevertheless, the challenge lies in reconciling the need for higher temperatures within the furnace with the imperative of maintaining low nitrogen oxides (NOx) emissions, which limits the widespread use of NH3 as a fuel. In this article, the flow and combustion of coal-NH3 blends in a 3x700 MW tangentially-fired utility coal boiler furnace are investigated using Computational Fluid Dynamics (CFD). The impact of NH3 blending ratios is examined through numerically simulated combustion involving five co-firing ratios (CRs) of NH3, including 0%, 10%, 20%, 30%, and 50%. Various combustion properties are assessed, including the furnace's temperature profile, flow distribution, species emissions, pollutant formation, and heat generation. To validate the approach, single coal and coal blend simulations performed depicted reasonable agreement in predicting furnace flame temperatures. The predicted flue gas temperature exhibited a decrease with an increase in NH3 CR, leading to a reduction in the furnace’s heat generation. Regarding flow characteristics, there was a notable increase in velocity as the concentration of NH3 was raised. The elevated NH3 content correlated with an observed rise in oxygen (O2) residue in the rear pass, coupled with a decrease in both carbon dioxide (CO2) and carbon monoxide (CO) concentrations. Pollutant formation, assessed in terms of nitrogen oxide (NO) emissions, revealed an increase in concentration with the rise in NH3 CR. Indeed, these findings suggest a promising strategy for adopting NH3 as a viable alternative to coal, representing an effective carbon-neutral fuel for the future.

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Section: Governing Equationsmentioning

confidence: 99%

Section: Governing Equationsmentioning

confidence: 99%