Advanced CFD modelling of air and recycled flue gas staging in a waste wood-fired grate boiler for higher combustion efficiency and greater environmental benefits

Rajh, Boštjan; Yin, Chungen; Samec, Niko; Hriberšek, Matjaž; Kokalj, Filip; Zadravec, Matej

doi:10.1016/j.jenvman.2018.04.030

Cited by 37 publications

(6 citation statements)

References 9 publications

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“…Another measure of mixing performance is the uniformity index. 37 It was calculated by applying a tracer at inlet A as a passive scalar through tracking the concentration at each cut plane along the reactor length. From the graph in Fig.…”

Section: Simulationmentioning

confidence: 99%

Development of customized 3D printed stainless steel reactors with inline oxygen sensors for aerobic oxidation of Grignard reagents in continuous flow

et al. 2019

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Section: Simulationmentioning

confidence: 99%

Development of customized 3D printed stainless steel reactors with inline oxygen sensors for aerobic oxidation of Grignard reagents in continuous flow

et al. 2019

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“…Detailed descriptions of the above equations and the k-epsilon turbulence model with experimental verification are presented in [24]. The k-ε realizable model was implemented since it is widely used to calculate free gas flows in relatively large domains, such as in power boilers [19,20]. In [25], this model was used to develop a flow in a large-scale coal-fired boiler.…”

Section: Flow-governing Equations and Model Assumptionsmentioning

confidence: 99%

“…The authors of [18] investigated heat transfer by conduction and radiation from the flue gases to the evaporator and boiler superheaters. The flue gas and air mix flow through the power boiler was analyzed in [19]. In [20], the exhaust gas recirculation performance was determined.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis on the Flue Gas Temperature Maintenance System of a Solid Fuel-Fired Boiler Operating at Minimum Loads

Kurkus-Gruszecka¹,

Krawczyk²,

Lewandowski³

2021

Energies

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Currently, energy policy is associated with the increase in the share of renewable sources in systemic energy production. Due to this trend, coal-fired power units must increase their work flexibility. Adapting a coal power plant to work with a lower load often causes the issue of maintaining the temperature before the selective catalytic reduction (SCR) installation at a sufficiently high level. This paper presents a CFD analysis of the mixing area of two flue gas streams before the SCR installation with various methods for mixing flue gas streams. The novelty of the work is mixing the flue gas streams of different temperatures using a flap shape developed by the authors. A series of numerical simulations were performed to develop the location and method of introducing the higher temperature gas, obtaining a uniform distribution of the exhaust gas temperature. The simulation scheme was applied to a series of geometrical modifications of the boundary conditions. The tested solution using only a single, straight flap in the flue gas duct allows the amplitude to be reduced from 298 K to 144 K. As a result of the research, a mixing flap design was developed to reduce the initial temperature amplitude of the flue gas streams from 298 K to 43 K.

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“…Gómez et al [31] implemented several models of thermal conversion of solid fuels and the interaction with the gas phase in a commercial CFD code. Rajh et al [32] found that the optimization of air and recirculation flue injection can make the temperature and velocity distribution more uniform, increasing the time that combustibles stay in the high-temperature region, and improving the burnout of the boiler. Sun et al [33] found that when the particle diameter is reduced, the convective heat transfer and combustion speed decrease, the diameter of the material particles increases, the height of the combustion zone increases, and the temperature in the high-temperature region decreases.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation on arches structural optimization of corn stalk incinerator based on a novel momentum design method

Liu

Zhu

2021

Biomass Conv. Bioref.

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In view of the lack of theoretical basis for the current design of incinerator arches, a new momentum design method for designing small-scale incinerator arches for the disposal of corn stalk is proposed in this paper. At the same time, eight different operating conditions are determined by the orthogonal experimental design method. In this study, the momentum design method is used to carry out theoretical research on the arches structural parameters and aerodynamic characteristics of a small-scale incinerator combustion chamber in eight different conditions, which is verified by cold state experiments. As a result, a novel L-shaped flame configuration of arches for the small-scale corn stalk incinerator is developed. Cold state experimental results show that stable combustion condition can be obtained by using L-shaped flame technology and the optimum ratio of air supply, along the length of grate, below the front arch and the rear arch is found to be 3:7, which are consistent with the theoretical calculation results of the momentum design method. At the same time, it is found that the maximum turbulence intensity along the length of grate can be up to 10%, and the burning exuberant zone is approximately 0.40 ~ 0.75 of the whole relative length of the grate. The optimum dimensionless structural parameters of furnace arches are H/L = 0.333 and h/L = 0.12 with the front arch angle of 45° and horizontal rear arch, where H is the height of the front arch, h is the height of the rear arch, and L is the length of the grate of the incinerator. H/L and h/L are dimensionless criterion numbers, which could be applied in designing waste incinerator with different treatment capacity. Lastly, hot state experiment verifies the effectiveness of the arch structure of the L-flame horizontal reciprocating grate incinerator. KeywordsMomentum design method • Disposal of corn stalk • Small-scale horizontal reciprocating grate incinerator • Cold and hot state experiment • L-shaped flame arches structure * Guangyu Zhu

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Advanced CFD modelling of air and recycled flue gas staging in a waste wood-fired grate boiler for higher combustion efficiency and greater environmental benefits

Cited by 37 publications

References 9 publications

Development of customized 3D printed stainless steel reactors with inline oxygen sensors for aerobic oxidation of Grignard reagents in continuous flow

Development of customized 3D printed stainless steel reactors with inline oxygen sensors for aerobic oxidation of Grignard reagents in continuous flow

Numerical Analysis on the Flue Gas Temperature Maintenance System of a Solid Fuel-Fired Boiler Operating at Minimum Loads

Experimental investigation on arches structural optimization of corn stalk incinerator based on a novel momentum design method

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