Numerical simulation of co-incineration of sewage sludge and municipal solid waste in municipal solid waste incinerator

Wang, Haichuan; Liao, Yanfen; Ma, Xiaoqian; Zeng, Xianghao

doi:10.1051/e3sconf/202019404019

Cited by 6 publications

(4 citation statements)

References 22 publications

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“…We assume that the nitrogen in the fuel is converted to HCN intermediates in 55% of the fuel, 5% is converted to NH 3 , and 40% is directly generated NO. 19 SNCR denitrification uses a urea solution, and a DPM is used to describe the injection process. 20 The decomposition mechanism of urea solution is shown in Table 2, 21 and the reaction mechanism of SNCR denitrification is shown in Table 3.…”

Section: Mathematical Modelmentioning

confidence: 99%

Numerical Simulation Study on Combustion of Low Calorific Value Waste Blended with Biomass

Huang,

Gong,

Peng

et al. 2024

ACS Omega

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Numerical simulations of a 600 t/day waste incinerator was carried out using the fluid dynamic incinerator code and Fluent to evaluate the effect of biomass blending on furnace temperature, pollutant generation, and selective noncatalytic− reduction (SNCR) denitrification when treating low calorific−value waste. The results show that as the biomass blending ratio increases, the water content gradually decreases, the calorific value increases, and the maximum temperature of the incinerator gradually increases from 1227 to 1408 K, while the content of exported NO x increases from 579 to 793 mg/Nm 3 ; during the combustion of low-quality waste, the residence time of the flue gas in the high-temperature region (above 1123 K) is 1.62 s. When the biomass blending ratio exceeds 20%, the residence time of the flue gas in the hightemperature region is more than 2 s, which can effectively curb the generation of dioxin. When the biomass blending ratio is 20%, and the normalized stoichiometric ratio (2n urea /n NO ) of urea injected into the SNCR is 1.1, the NO x concentration at the outlet is 230.08 mg/Nm 3 , which satisfies the NO x emission standard of less than 250 mg/Nm 3 .

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Section: Mathematical Modelmentioning

confidence: 99%

Numerical Simulation Study on Combustion of Low Calorific Value Waste Blended with Biomass

Huang,

Gong,

Peng

et al. 2024

ACS Omega

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“…Since the mass concentration of NOx at the tail flue outlet is reduced by 3.3%, this staged-air distribution scheme is beneficial to the low-NOx combustion in the incinerator. 21 Utilizing the FLIC and Fluent simulation software, Wang et al studied the effect of air distribution on the waste combustion process in a 900 t/d large-scale grate-type waste incinerator. The simulation results reveal that the injection of secondary air at the front and rear arches of the incinerator can strengthen the airflow disturbance at the arches and effectively reduce the high-temperature flue gas erosion on the arches.…”

Section: Numerical Simulation Of Medium-scale Incineratorsmentioning

confidence: 99%

Discussion on application of FLIC-Fluent coupled simulation technology on medium-scale and large-scale municipal solid waste incinerators

Zhang

2023

Sixth International Conference on Intelligent Computing, Communication, and Devices (ICCD 2023)

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Today, the world economy is in the stage of rapid development, followed by the rising quantity, the decreasing moisture content, and the increasing heat value of Municipal Solid Waste (MSW). Since waste incineration has the advantages of excellent volume reduction effect, high resource utilization efficiency, and less secondary pollution to the environment, waste incineration disposal technology has received extensive attention worldwide. With the continuous increase of the urban population, the amount of sewage sludge is growing year by year. The process of the sludge incineration system is highly complicated, and the cost of construction and operation is high. The waste incinerator can process not only MSW but also sewage sludge. Therefore, the co-incineration of sewage sludge with MSW in the existing waste incinerator is a safe and effective way to dispose of sewage sludge. In this paper, the simulation results of Computational Fluid Dynamics (CFD) are analyzed for medium-scale and large-scale waste incinerators, characterized by high moisture content, high ash content, low heat value of sewage sludge, and incomplete combustion and high pollutant emissions in waste incinerators. With FLIC-Fluent coupled simulation method, the critical information such as temperature field, velocity field, concentration field of principal components, and the pollutant emissions can be predicted. Based on the CFD simulation results, the performance and structure of waste incinerators can be optimized, and the new products can be designed and developed.

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“…Sequential batch influent has the advantages of both the continuous stirred tank reactor (CSTR) and plug-flow reactor (PFR), with a high driving force for biochemical reactions [10][11][12][13][14][15][16][17][18]. According to the principles of biochemical reaction kinetics, in a fully mixed pre-treatment reactor with continuous flow, the distribution of substrate, microorganisms, and dissolved oxygen is uniform; however, due to the low gradient of substrates and microorganisms, the driving force of biochemical reactions is relatively small, and the reaction rate and removal efficiency are relatively low.…”

Section: The Theory Of the Biochemical Reaction Of The Sbermentioning

confidence: 99%

A Comparative and Optimal Experiment of a Sequential Batch Enhanced Pre-Treatment Reactor without Sludge Retention

Liu,

Zhang,

Yao

et al. 2023

Water

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This article focuses on the limitations of the traditional treatment technology of leachate, based on the principles of reaction kinetics and analysis of biological treatment technology, and conducts a comparative study of the synchronization experiments of a sequential batch enhanced pre-treatment reactor without sludge retention (SBER for short), sequential batch reactor (SBR for short), and continuous stirred tank reactor (CSTR for short). It has been confirmed that the SBER has higher and more stable pre-treatment efficiency for organic matter and nutrients, significantly improves the biodegradability and nutrient ratio of pre-treatment, and creates favorable conditions for subsequent aerobic biological treatment. The further orthogonal test confirmed that dissolved oxygen (DO for short), hydraulic retention time (HRT for short), pH, and sequencing period were significant influencing factors on the treatment efficiency of the SBER, and the optimal operating parameters of the SBER were obtained: aeration time (Ta for short) = 8 h/d, HRT = 4 d, pH = 8.0, and sequencing period (Ts) = 6 h.

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Numerical simulation of co-incineration of sewage sludge and municipal solid waste in municipal solid waste incinerator

Cited by 6 publications

References 22 publications

Numerical Simulation Study on Combustion of Low Calorific Value Waste Blended with Biomass

Numerical Simulation Study on Combustion of Low Calorific Value Waste Blended with Biomass

Discussion on application of FLIC-Fluent coupled simulation technology on medium-scale and large-scale municipal solid waste incinerators

A Comparative and Optimal Experiment of a Sequential Batch Enhanced Pre-Treatment Reactor without Sludge Retention

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