Two-fluid simulation of moving grate waste incinerator: Comparison of 2D and 3D bed models

Xia, Zihong; Long, Jisheng; Yan, Shuai; Bai, Li; Du, Hailiang; Chen, Caixia

doi:10.1016/j.energy.2020.119257

Cited by 20 publications

(8 citation statements)

References 28 publications

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“…The combustion of MSW on the grate involves the solid-phase reaction in the grate bed and the gas-phase reaction in the furnace (Gu et al 2022a;Xia et al 2021;Zhou et al 2021). The solid-phase combustion process in the bed is divided into three stages, as shown in Fig.…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical simulation on influencing factors of co-firing of municipal solid waste and leather

Guo

et al. 2023

BioRes

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Incineration is an important method of recycling municipal solid waste (MSW). As an industrial waste, leather has a higher calorific value and more combustible components than MSW. The blending of leather can make up for the high moisture content and insufficient calorific value of MSW, providing a good solution to reduce the capacity of MSW and industrial waste. This study predicts the effect of blending combustion by means of numerical simulation; the effects of leather blending ratio, the ratio of primary air and secondary air, total air volume, and fuel feed rate were analyzed. The results showed that the appropriate increase of blending ratio improves the furnace chamber temperature, and the best blending amount of leather is approximately 10%. The best primary and second air ratio is 0.72:0.28. Insufficient airflow caused inadequate combustion, and excessive airflow reduced the furnace temperature. The feed volume in the range of 500 to 550 t/d had a good burning effect.

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Section: Mathematical Modelmentioning

confidence: 99%

Numerical simulation on influencing factors of co-firing of municipal solid waste and leather

Guo

et al. 2023

BioRes

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“…Yang et al [14] studied the effect of different air supply methods and primary/secondary air ratios on NO X . Xia et al [15] proposed a method combining a two-dimensional bed model with a three-dimensional stabilized furnace model. The three-dimensional steady-state simulation of turbulent gas combustion in the whole furnace was carried out.…”

Section: Introductionmentioning

confidence: 99%

Three-Dimensional Numerical Modeling and Analysis for the Municipal Solid-Waste Incineration of the Grate Furnace for Particulate-Matter Generation

Tang

Xia

et al. 2023

Sustainability

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A 3D numerical model of the municipal solid waste incineration (MSWI) process was constructed based on a grate furnace with a daily processing capacity of 800 tons. Fluent was used for analyzing key factors affecting the concentration and diffusion level of particulate matter (PM). According to the actual MSWI plant working condition, a 3D model of the incinerator and the waste heat boiler has been constructed under benchmarks. Key factors affecting PM generation were determined by combining mechanistic knowledge and experts’ experience. They were the combustion temperature of solid phase municipal solid waste (MSW), the wall’s PM collision mode, and the second baffle length. Subsequently, the process of resolving the 3D numerical model was delineated. Then, a univariate analysis of the aforementioned 3D model was conducted for the three pivotal factors mentioned above. Conclusively, the effect of the important factors on the number of particles at the outflow of the incinerator was analyzed via orthogonal experiments to obtain the optimal combination. PM concentration initially diminished and then rose with the increased combustion temperature of the solid-phase MSW. Furthermore, a noteworthy reduction in PM concentration was observed when the second baffle length was 12.45–12.95 m. The greatest influence on the PM concentration of the outlet was posed by the wall’s PM collision mode, followed by the second baffle length. The appropriate adjustment of the combustion temperature of the solid-phase MSW, selection of wall materials, and design of the second baffle length were beneficial for diminishing PM concentration and ensuring long-term stable operation of the MSWI process. The combinative optimality of the three key factors was acquired via orthogonal experiments, which proved the subsequent optimal control of PM concentration at the outlet.

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“…Incineration is currently the most widely used and mature waste treatment method and the structural design of the incinerator is usually related to factors such as the type, chemical components and incineration characteristics of the waste to be treated, mainly dividing into grate incinerator, fluidized bed incinerator, and rotary kiln incinerator, etc. [10,11]. Among them, Rotary kiln (RK) incineration technology has the advantages of high capacity, strong material adaptability (solid, liquid, or pasty wastes), relatively simple pretreatment process, safety, and reliability, which makes rotary kiln incineration technology widely used in the field of hazardous waste treatment to realize the harmlessness, reduction, and recycling of hazardous waste to the maximum extent [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…XRD patterns of slagging samples during hazardous waste incineration: (a) middle and rear sections of rotary kilns; (b) exit flue of second combustion chamber. The main crystalline phases are: (1) quartz (SiO 2 ), (2) labradorite (Ca 0.65 Na 0.35 (Al 1.65 Si 2.35 O 8 )), (3) anhydrite (CaSO 4 ), (4) calcium carbonate (CaCO 3 ), (5) diposide (CaMgSi 2 O 6 ), (6) halite (NaCl), (7) hematite (Fe 2 O 3 ), (8) magnesioferronite (MgFe 2 O 4 ), (9) magnetite (Fe 3 O 4 ),(10) magnesium iron oxide (MgO-FeO), (11) hauyne (Na 6 Ca 2 Al 6 Si 6 O 24 (SO 4 ) 2 ), (12) nepheline (KNa 3 (AlSiO 4 ) 4 ).…”

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confidence: 99%

Formation and Growth Behavior Analysis of Slagging Rings in Rotary Kiln-Type Hazardous Waste Incineration Systems

Zhao

Zhang

et al. 2021

Energies

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Rotary kiln incineration technology has the advantages of strong material adaptability and a simple treatment process and has been widely used in hazardous waste treatment. However, the actual incineration process has caused problems such as ring formation in the treatment system due to the lack of research on the slagging mechanisms. In this paper, slagging phenomena occurring in the second half of the rotary kiln, the exit flue of the secondary combustion chamber, and the wall of the quench tower are analyzed and discussed in detail through characterization methods. The results indicate that the adhesion of low-melting alkali metal salts on the refractory surface in the second half of the rotary kiln is the key factor in forming the initial slagging layer. In the growth process of the slagging ring, the formed liquid phase can bond incineration residues of different sizes together and form a dense embryo body through liquid phase sintering. The deposition and solidification of molten/semi-molten fly ashes cause slagging formation in the exit flue of the secondary combustion chamber. The slagging phenomenon occurring in the inner wall of the quench tower belongs to the “crystalline-coalesce-hardening” process of the inorganic salts precipitating out of the high-salt wastewater.

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Two-fluid simulation of moving grate waste incinerator: Comparison of 2D and 3D bed models

Cited by 20 publications

References 28 publications

Numerical simulation on influencing factors of co-firing of municipal solid waste and leather

Numerical simulation on influencing factors of co-firing of municipal solid waste and leather

Three-Dimensional Numerical Modeling and Analysis for the Municipal Solid-Waste Incineration of the Grate Furnace for Particulate-Matter Generation

Formation and Growth Behavior Analysis of Slagging Rings in Rotary Kiln-Type Hazardous Waste Incineration Systems

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