Study on the influencing factors of removal of NOX from cement kiln flue gas by sewage sludge as a denitration agent

Xiao, Xiang; Huang, Hong; Xu, Zhenghui; Wu, Haiwen; Huang, Jiankang; Fang, Ping

doi:10.1007/s11356-020-10126-2

Cited by 10 publications

(5 citation statements)

References 23 publications

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“…The reaction of volatile components is completed in the component transport equation of the main phase, in which S HCN , S NO , and S CO are customized source terms. The S HCN reaction rate is determined by the combustion reaction rate and Equations (34) and (37). The S NO reaction rate is determined by Equations ( 34), (37) and (39), and the reaction rate of S CO is determined only by the rate of the combustion reaction.…”

Section: 9 Mathematical Model Coupling Strategymentioning

confidence: 99%

“…The S HCN reaction rate is determined by the combustion reaction rate and Equations (34) and (37). The S NO reaction rate is determined by Equations ( 34), (37) and (39), and the reaction rate of S CO is determined only by the rate of the combustion reaction.…”

Section: 9 Mathematical Model Coupling Strategymentioning

confidence: 99%

“…Therefore, it could be further used for investigating the co-processing combustion with sludge involved. Xiao et al [37] sorted out the emission process of NO during the co-disposal of sludge in the cement industry, and proposed that parameters like sludge input and sludge particle size have an influence on the decomposition of raw materials and the generation of NO. In this work, we concentrate on the effects of key parameters on the decomposition furnace characteristics like raw material decomposition rate and NO emission.…”

Section: Model Verificationmentioning

confidence: 99%

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The Co-Processing Combustion Characteristics of Municipal Sludge within an Industrial Cement Decomposition Furnace via Computational Fluid Dynamics

Zhu,

Mao,

Liu

et al. 2024

Mathematics

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Dealing with municipal sludge in an effective way is crucial for urban development and environmental protection. Co-processing the sludge by burning it in a decomposition furnace in the cement production line has been found to be a viable solution. This work aims to analyze the effects of the co-disposal of municipal sludge on the decomposition reactions and NOx emissions in the decomposing furnaces. Specifically, a practical 6000 t/d decomposition furnace was taken as the research object. To achieve this, ANSYS FLUENT with a UDF (user-defined function) was applied to establish a numerical model coupling the limestone decomposition reaction, fuel combustion, and NOx generation and reduction reactions. The flow, temperature, and component field distributions within the furnace with no sludge were firstly simulated with this model. Compared with site test results, the model was validated. Then, with sludge involved, the structure and operation parameters of the decomposition furnace for the co-disposal of municipal sludge were investigated by simulating the flow field, temperature field, and component field distributions. Parametric studies were carried out in three perspectives, i.e., sludge mixing ratio, preheating furnace arrangement height, and sludge particle size. The results show that all three aspects have great importance in the discomposing process. A set of preferable values, including a sludge mixing ratio of 10%, preheating furnace height of 21.5 m, and sludge particle diameter of 1.0 mm, was obtained, which resulted in a raw material decomposition rate of 89.9% and a NO volume fraction of 251 ppm at the furnace outlet.

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Section: 9 Mathematical Model Coupling Strategymentioning

confidence: 99%

Section: 9 Mathematical Model Coupling Strategymentioning

confidence: 99%

Section: Model Verificationmentioning

confidence: 99%

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The Co-Processing Combustion Characteristics of Municipal Sludge within an Industrial Cement Decomposition Furnace via Computational Fluid Dynamics

Zhu,

Mao,

Liu

et al. 2024

Mathematics

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“…However, its fixed carbon and calorific value are lower, which makes it more possible to emit NOx during co--disposal. Shimizu et al [8] suggested that ash in sludge combustion promoted NOx production, Some authors [9] suggested that sludge feeding amount, sludge particle size, cement raw material and its composition, and additive species played an important role in NOx removal. Lv et al [10] suggested that NH3 released from sludge increased the NH3 content in the decomposer and had a facilitating effect on the reduction of NO.…”

Section: Introductionmentioning

confidence: 99%

Effects of co-disposal of sludge based on TTF-type precalciner on NOx emissions

Ruru Liang,

Guanglei Yuan,

Renping Liu

et al. 2023

Environ. Protect. Eng.

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To reduce the emission of nitrogen oxides (NOx) during the co-disposal of sludge in a TTF-type precalciner, an optimized co-disposal process of a TTF-type precalciner has been implemented in a cement plant in Hebei. The model was built using ANSYS FLUENT software. The effects of three singlefactor perspectives (sludge input ratio, gas flow rate, and tertiary air temperature on NO concentration) were investigated. The response surface method of Box-Behnken design was used. When the sludge ratio increased from 0 to 25%, the NO concentration at the outlet was 122-297 mg/m³. Meanwhile, it increased from 192 mg/m³ to 241 mg/m³ since the airflow increased from 95 m³/s to 122 m³/s. The maximum NO concentration was 192 mg/m³ when the tertiary air temperature was 1170 K. The interaction between airflow and sludge ratio was more significant than any other interaction between other conditions (P < 0.05). Finally, the optimum conditions were a sludge ratio of 5%, airflow 109 m³/s, and tertiary air temperature 1280 K. NO concentration was 166.9 mg/m³ under this condition.

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“…Some gas products can be used as reducing agent to reduce the NO X (Werle S 2012). Xiang Xiao et al systematically studied the use of sludge as denitrification agent in cement industry using a selfmade laboratory-scale fluidized bed reactor and showed that sludge is an effective NOx reducing agent (Xiao et al 2020;Ye et al 2020). When the sludge dosage is 0.75g/min, the sludge particle size is 0.18-0.25mm and the combustion temperature is 900℃, the NO x removal rate can reach 70.36 ± 3.59% in cement kiln.…”

Section: Introductionmentioning

confidence: 99%

The influence of organic components in sludge on selective non-catalytic reduction denitrification

Wang,

Zong,

Song

et al. 2023

Environ Sci Pollut Res

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Collaborative disposal of sludge has been applied extensively in cement industry kilns， but the influence of organic components in sludge on the SNCR denitrification is still in highly demanding. This paper focuses the influence of ethanol, n-octane, benzene and acetone on the SNCR denitrification, and the influence of ethanol are analyzed on SNCR denitrification under different flue gas condition. The result showed that •H and •OH as active groups are produced during the combustion of organic components, promoting the generation of •NH 2 from NH 3 , and therein the lower reaction temperature of SNCR. When the temperature of SNCR reaction is at 750~800℃, the denitrification rate of four organic components is: ethanol > benzene > n-octane > acetone. The optimum denitrification rate on SNCR can reach as high as 90.377% when the reaction condition is: the NH 3 /NO is 1, the ethanol concentration is 1000ppm, O 2 concentration is 2% and temperature is 750℃. In this paper, the influence of organic components in sludge on SNCR denitrification will be analyzed, which provides a theoretical basis for the selection of sludge dosing method for cement kiln collaborative disposal.

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Study on the influencing factors of removal of NOX from cement kiln flue gas by sewage sludge as a denitration agent

Cited by 10 publications

References 23 publications

The Co-Processing Combustion Characteristics of Municipal Sludge within an Industrial Cement Decomposition Furnace via Computational Fluid Dynamics

The Co-Processing Combustion Characteristics of Municipal Sludge within an Industrial Cement Decomposition Furnace via Computational Fluid Dynamics

Effects of co-disposal of sludge based on TTF-type precalciner on NOx emissions

The influence of organic components in sludge on selective non-catalytic reduction denitrification

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