Development of Subair Technique for Combustibility Enhancement and NOx Reduction in a Pulverized Coal-Fired Boiler

Kim, Kang-Min; Ahn, Seok-Gi; Kim, Gyu-Bo; Jeon, Chung-Hwan

doi:10.1021/acsomega.8b03405

Cited by 6 publications

(3 citation statements)

References 40 publications

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“…Extensive literature exists on the effects of boiler configuration or operating conditions on their performance, particularly NOx emissions at the pilot-scale and HELE utility boilers with one or more implemented low-NOx combustion technologies. Several numerical studies over the past decade have demonstrated the effectiveness of low-NOx combustion technologies, including low-NOx swirl burners, ,, the optimized ratio and position of OFA, LNCFSs, and air staging, , the sub air technique, HBC and OFA, the double-tangential-circle boiler, and advanced firing systems for down-fired boilers . Various parameters must be considered to evaluate their effects on low-NOx combustion in different boilers.…”

Section: Cfd Modeling Of Hele Coal Combustionmentioning

confidence: 99%

A Review of the Numerical Modeling of Pulverized Coal Combustion for High-Efficiency, Low-Emissions (HELE) Power Generation

et al. 2021

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High-efficiency, low-emissions (HELE) coal-fired power plant technologies operate with a higher thermal efficiency of the steam cycle for coal-fired power generation, reducing CO2 emissions per unit energy generation. They represent some of the primary and intermediate solutions to the world’s energy security. Extensive numerical modeling efforts have been undertaken over the past several decades, which have increased our understanding of the technical problems in HELE boilers, including combustion and boiler performance optimization, ash deposition, and material problems at higher operating temperatures and pressures. Overall, the differences in the physical and chemical models, boiler performance, and ash deposition of oxy-fuel combustion in HELE boilers that recirculate CO2 and H2O in the boilers are also discussed in comparison with the combustion of coal in the air. This Review comprehensively summarizes the current research on numerical modeling to offer a better understanding of the technical aspects and provides future research requirements of HELE coal-fired boilers, including boiler performance optimization, ash deposition, and material problems. The effects of changes in the configuration and operating conditions are discussed, focusing on the optimization of boiler performance in aspects such as unburnt carbon and NOx emissions. The paper also reviews the retrofit and optimization of operating conditions and the burner geometry with the low-NOx coal combustion technologies necessary to operate the HELE power plants. In terms of ash deposition, the development of submodels, including particle sticking and impacting behaviors and their effects on the deposit growth predictions under different temperatures, are discussed. Numerical models of the material oxidation and creep in the austenitic and nickel-based alloys generally used in HELE conditions have been developed using the finite element method to predict the availability of advanced alloys and creep life in the actual service time of the boiler parts. The predictions of oxide scale growth and exfoliation on the steam-side and fire-side and the creep strength are analyzed. The review also identifies some further research requirements in numerical modeling to achieve the optimization of coal combustion processes and address the technical problems in advanced HELE power plant operations.

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Section: Cfd Modeling Of Hele Coal Combustionmentioning

confidence: 99%

A Review of the Numerical Modeling of Pulverized Coal Combustion for High-Efficiency, Low-Emissions (HELE) Power Generation

et al. 2021

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“…In boilers that operate at non-high temperatures, fuel NOx accounts for most of the boiler emissions (fuel NOx accounts for 95% in the fluidized bed, and the corners are generally rounded about 75%). Volatile NOx accounts for 60%-80% of the final NOx emission of the boiler, while coke NOx only accounts for a small part [5][6][7][8].The main purpose of the low-nitrogen burner modification is to control the amount of NOx generated by the fuel type and the thermal type NOx. The main method is to control the airfuel ratio in the local area of the boiler and the maximum temperature of combustion in the furnace.Domestic low-nitrogen burners reduce NOx by realizing pulverized coal concentration separation, air graded combustion, and large burn-out air rate [9][10].…”

Section: Introductionmentioning

confidence: 99%

Research on boiler test and combustion optimization control after low-nitrogen burner transformation

Jiang,

Wang,

Han

et al. 2024

Eighth International Conference on Energy System, Electricity, and Power (ESEP 2023)

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This paper analyzes the principle of low-nitrogen burner modification and discusses the impact of low-nitrogen burner modification on boiler operation. The target unit underwent a low-nitrogen burner retrofit. The testers tested the cold and hot performance, analyzed the operating characteristics of the unit after transformation, and pointed out the direction of operation optimization. This paper summarizes the operation characteristics of dozens of low-nitrogen burners after transformation, analyzes the problems and corresponding optimization measures of low-nitrogen burners of different capacity units, and provides suggestions for the optimal operation of low-nitrogen burners after transformation.

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“…The most commonly used NO x control technologies are selective non‐catalytic reduction (SNCR) and selective catalytic reduction (SCR). The latter has become an important process to control NO x emission in coal‐fired power plants and automobiles [4–6] . In addition to NO x , the carbon monoxide (CO) emitted by automobiles at the same time will also cause great damage to the environment [7,8] .…”

Section: Introductionmentioning

confidence: 99%

Subnanometric Pt on Cu Nanoparticles Confined in Y‐zeolite: Highly‐efficient Catalysts for Selective Catalytic Reduction of NOx by CO

Liu

Jiang

et al. 2021

ChemCatChem

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CO selective catalytic reduction (CO‐SCR), a promising technology for simultaneous removal of harmful CO and NO in exhaust gases, has attracted much attention in recent years. Pt‐based catalysts have been demonstrated to be effective for this reaction. However, it remains a big challenge to achieve a high low‐temperature activity at a low Pt loading. Here we report a new catalyst consisting of subnanometric Pt on Cu nanoparticles confined in the NaOH‐modified Y‐zeolite (Pt−Cu@M−Y). This catalyst possesses enhanced catalytic performance in CO‐SCR at an extremely low Pt content of 0.04 wt %, achieving full NO conversion at 250 °C. The Pt−Cu@M−Y catalyst was synthesized using a simple impregnation method followed by a hydrogen reduction. Transmission electron microscopy study revealed that Pt−Cu@M−Y with subnanometric Pt on Cu nanoparticle of ∼5 nm was highly dispersed in M−Y. The superior catalytic property of Pt−Cu@M−Y is attributed to the synergistic catalysis of Pt and Cu, in which subnanometric Pt species contributes to the strong adsorption of NO, while the dissociation of NO and the migration of dissociated O atoms are significantly boosted on the newly generated interfaces between Cu nanoparticles and the formed surface CuOx species. This work develops an effective method for synthesizing bimetallic nanoparticles confined in zeolite and demonstrates their superior catalytic performance in the catalytic reduction of NOx by CO.

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Development of Subair Technique for Combustibility Enhancement and NOx Reduction in a Pulverized Coal-Fired Boiler

Cited by 6 publications

References 40 publications

A Review of the Numerical Modeling of Pulverized Coal Combustion for High-Efficiency, Low-Emissions (HELE) Power Generation

A Review of the Numerical Modeling of Pulverized Coal Combustion for High-Efficiency, Low-Emissions (HELE) Power Generation

Research on boiler test and combustion optimization control after low-nitrogen burner transformation

Subnanometric Pt on Cu Nanoparticles Confined in Y‐zeolite: Highly‐efficient Catalysts for Selective Catalytic Reduction of NOx by CO

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