Prediction of ash slagging propensity in a pulverized coal combustion furnace

Degereji, M.U.; Ingham, D.B.; Ma, Lin; Pourkashanian, Mohamed; Williams, Alan

doi:10.1016/j.fuel.2010.12.038

Cited by 70 publications

(44 citation statements)

References 36 publications

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“…The database includes crucial data for coal certificate of ultimate analysis and proximate ash analysis. The useful data were Table 1 Summary of some existing slagging indices [1][2][3][4][5][6] used to conduct calculation of empirical numerical slagging indices and the combustion performance studies using computational fluid dynamics at a later stage.…”

Section: Numerical Slagging Indicesmentioning

confidence: 99%

“…Hence by calculating the constant for each minerals composition as the neural network, the composition has the ability to alter the temperature and viscosity [8]. The viscosity model of Watt and Fereday (1969) is as follows: Softening temperature is calculated using the neural network which take into consideration the main monomers and modifying monomers as well as minerals like CaO and MgO [1,3].…”

Section: Numerical Slagging Indicesmentioning

confidence: 99%

“…The right viscosity of coal at high temperature has to be in the correct range to ensure good combustion performance of the coals. The ash analysis coals slagging numerical indices has been studied, tested and integrated with actual plant data to obtain numerical slagging indices [1][2][3][4][5][6]. The importance of the slagging numerical indices is to segregate and classify the coals based on its ash analysis and predict its tendency to change physical properties to slag.…”

Section: Introductionmentioning

confidence: 99%

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Investigation on Coal Slagging Characteristics and Combustion Behaviour in Furnace

Sophia

Hasini

2017

MATEC Web Conf.

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Abstract. This paper describes an investigation of coal characteristics and slagging potential using coal slagging assessment tool such as numerical slagging indices. Historical data on coal use according to type and shipment in power plant was use for the analysis. It is found that higher content of silica oxide results in higher softening temperature and the monomers modifiers can alter the softening temperature. Calculation also reveals encouraging conditions that could possibly prevent the slagging potential inside the furnace.

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Section: Numerical Slagging Indicesmentioning

confidence: 99%

Section: Numerical Slagging Indicesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigation on Coal Slagging Characteristics and Combustion Behaviour in Furnace

Sophia

Hasini

2017

MATEC Web Conf.

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“…Most mechanistic particle adhesion modelling approaches use the concept presented in (Walsh et al, 1990), which provides the basis for many research studies on deposit formation simulations (Lockwood and Lee, 1999;Degereji et al, 2012). The sticking probability of an impacting particle is determined as a function of the sticking probability of both the particle (p part ) and the surface (p surf ).…”

Section: Deposit Formation Modelmentioning

confidence: 99%

Computational Modelling of a Tangentially Fired Boiler With Deposit Formation Phenomena

Modliński¹

2014

Chemical and Process Engineering

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Any complete CFD model of pulverised coal-fired boiler needs to consider ash deposition phenomena. Wall boundary conditions (temperature and emissivity) should be temporally corrected to account for the effects of deposit growth on the combustion conditions. At present voluminous publications concerning ash related problems are available. The current paper presents development of an engineering tool integrating deposit formation models with the CFD code. It was then applied to two tangentially-fired boilers. The developed numerical tool was validated by comparing it with boiler evaporator power variation based on the on-line diagnostic system with the results from the full CFD simulation.

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“…5 However, this could result in slag, high-temperature corrosion and a decrease in combustion efficiency. 3,6 Raising the temperature of the combustion area has a favorable effect on combustion efficiency and stability, but it will increase NOx emission and cause high-temperature corrosion. The corrosion mechanisms can be attributed to the attack from sulfur species (H 2 S and [S]) and chlorine-based species (HCl and Cl 2 ), and to the deposition of unoxidized material (FeS and char).…”

Section: Introductionmentioning

confidence: 99%

Influence of offset angle of mid-secondary air nozzles on gas-particle flow characteristics in a furnace

Wang

Cheng

et al. 2018

RSC Adv.

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A three-component particle-dynamics anemometer was used to measure the characteristics of two-phase gas-particle flows in a primary air nozzle using a gas/particle two-phase test facility. The jet trajectory of primary air velocities, Reynolds stress and particle concentration profiles were obtained. Based on this, the advantages and disadvantages of increasing the offset angle were analyzed to optimize performance. The results show that gas-particle slippage is not noticeable in the furnace, even though the midsecondary air offset angle changes. Within the jet's free developing zone, the location of the peak concentration does not change with the mid-secondary air offset angles. Properly enlarging the offset angle of mid-secondary air nozzles will delay the mixing of the secondary air into the primary-air-andcoal mixture and realize horizontal-staged combustion in a furnace. It also can enhance the stability of airflow and form a better blended jet tail, meanwhile reducing the vortex at the back-fire side and avoiding a short circuiting of the airflow. It is favorable for increasing combustion efficiency and preventing slagging and high-temperature corrosion.

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Prediction of ash slagging propensity in a pulverized coal combustion furnace

Cited by 70 publications

References 36 publications

Investigation on Coal Slagging Characteristics and Combustion Behaviour in Furnace

Investigation on Coal Slagging Characteristics and Combustion Behaviour in Furnace

Computational Modelling of a Tangentially Fired Boiler With Deposit Formation Phenomena

Influence of offset angle of mid-secondary air nozzles on gas-particle flow characteristics in a furnace

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