A review of some operation and maintenance issues of CFBC boilers

Arjunwadkar, Anand; Basu, Prabir; Acharya, Bishnu

doi:10.1016/j.applthermaleng.2016.04.008

Cited by 74 publications

(35 citation statements)

References 26 publications

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“…The effect was visible in the form of a local temperature rise reaching and even locally exceeding 1000 °C. Such a situation may lead to de-fluidization due to the melting or fusion of bed solids [ 16 ].…”

Section: Resultsmentioning

confidence: 99%

“…For each case (K1, K2, K3), the syngas supply led to an increase in temperature inside the furnace to over 1000 °C, mainly in the lower parts of the combustion chamber. Such a significant increase in temperature may lead to forming agglomerates, which can cause de-fluidization [ 16 ].…”

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

“…On the other hand, acceptable boiler design parameters may be exceeded due to changes in flue gas velocity and temperature profiles. Such cases may result in the destruction of some boiler components or a reduction in their service life [ 16 , 17 , 18 , 19 ].…”

Section: Introductionmentioning

confidence: 99%

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A Comprehensive, Three-Dimensional Analysis of a Large-Scale, Multi-Fuel, CFB Boiler Burning Coal and Syngas. Part 2. Numerical Simulations of Coal and Syngas Co-Combustion

Krzywański

Sztekler

Szubel

et al. 2020

Entropy

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This paper presents the results of numerical computations for a large-scale OFz-425 CFB (circulating fluidized bed) boiler utilizing coal and syngas. Four different operating scenarios are considered, including the reference variant, corresponding to the conventional, mono-combustion of bituminous coal, and three tests involving replacement of secondary air and part of the coal stream with syngas fed by start-up burners. Pressure, gas velocity, temperature, and carbon dioxide distribution in the combustion chamber are discussed in the paper. The results indicate that the syngas supply leads to an increase in local temperature and carbon dioxide concentrations. The proposed concept is not advisable as it may lead to frequent emergency stops of the CFB boiler.

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Section: Resultsmentioning

confidence: 99%

Section: Discussion and Concluding Remarksmentioning

confidence: 99%

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A Comprehensive, Three-Dimensional Analysis of a Large-Scale, Multi-Fuel, CFB Boiler Burning Coal and Syngas. Part 2. Numerical Simulations of Coal and Syngas Co-Combustion

Krzywański

Sztekler

Szubel

et al. 2020

Entropy

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“…Vuthaluru and D.H. French investigated clinker formation and the variation on deposit characteristics with time in a large-scale pulverised coal boiler [19]. A. Arjunwadkar et al reviewed some of the operation and maintenances issues of CFB boilers [20]. Recently, Victor Henrique Cobral Pinheiro et.…”

Section: Brief Review On Past Workmentioning

confidence: 99%

Intelligent Prediction of Clinker Formation Condition for Steam Boiler Tubes Using Artificial Neural Network

2019

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Ash, as one of the by-product of combustion either accumulates onto boiler tubes as slag or is collected by electrostatic precipitators attached to the backend of the boiler. Flue gas will transport these ash particles either to the inner surfaces of the boiler or to the dust collecting facilities at the backend of the boiler. Sintered ash deposits formed in the radiant section of the boiler are known as clinkers and they contribute to a wide variety of problems to the boiler. Preventative measures to combat clinker formation is in dire need to the energy sector. In this study, a prediction model using real plan data was developed for detection of clinker formation conditions. Several variations of Artificial Neural Networks were tried and test, with emphasis given on the feed-forward neural network, cascade neural network and recurrent neural network. In addition, sensitivity analysis was also conducted to determine the influence of random input variables to their respective response variables. The Tornado Diagram is selected as the method to determine the most influential parameter for clinker formation. It is expected that the Recurrent Neural Network prediction model and the identified most influential input parameter for clinker formation will assist operators in decision making for the maintenance of boilers.

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“…C irculating fluidized bed (CFB) technology has emerged as a highly utilized steam generation technology owing to its attractive features of fuel flexibility, and the number of CFB boiler installations has been growing exponentially in the last decades. [1][2][3][4][5] Compared to other combustion methods, CFB boilers are advantageous for combusting low rank coal, owing to their high combustion efficiency, lower abrasion to heating surface, limited ash deposition, and high desulphurization efficiency. [6][7][8][9][10][11][12] Neimeng coals mainly occur in the Early Cretaceous and Paleogene strata, [13] and belong to the category of low rank coal.…”

Section: Introductionmentioning

confidence: 99%

Study on the combustion and NO_x emission characteristics of low rank coal in a circulating fluidized bed with post‐combustion

Zhou

Cao

et al. 2017

Can J Chem Eng

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The combustion and NOx emission characteristics of low rank coal have been investigated in a circulating fluidized bed test plat, which was composed of a circulating fluidized bed (CFB) and post‐combustion chamber (PCC). The effects of the air stoichiometric ratio in the circulating fluidized bed furnace and air arrangement in the post‐combustion chamber were studied. In the optimized experimental condition, with the air stoichiometric ratio in the CFB (λCFB) at 0.963, and post‐combustion air (PCA) injected into the PCC using ports PCA1 and PCA3, the NOx emission was reduced to 48.7 mg/m3. The conversion of the fuel‐nitrogen in the coal into NOx did not occur under the reducing atmosphere in the circulating fluidized bed furnace. The final quantity of NOx generated from the combustion in the PCC was formed from gaseous HCN and residual nitrogen in fly ash, which flowed with flue gas from the CFB furnace. Enhancing the burnout fraction of coal in the CFB and using the air arrangement in the PCC could effectively reduce the final emission of NOx.

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A review of some operation and maintenance issues of CFBC boilers

Cited by 74 publications

References 26 publications

A Comprehensive, Three-Dimensional Analysis of a Large-Scale, Multi-Fuel, CFB Boiler Burning Coal and Syngas. Part 2. Numerical Simulations of Coal and Syngas Co-Combustion

A Comprehensive, Three-Dimensional Analysis of a Large-Scale, Multi-Fuel, CFB Boiler Burning Coal and Syngas. Part 2. Numerical Simulations of Coal and Syngas Co-Combustion

Intelligent Prediction of Clinker Formation Condition for Steam Boiler Tubes Using Artificial Neural Network

Study on the combustion and NO_x emission characteristics of low rank coal in a circulating fluidized bed with post‐combustion

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A review of some operation and maintenance issues of CFBC boilers

Cited by 74 publications

References 26 publications

A Comprehensive, Three-Dimensional Analysis of a Large-Scale, Multi-Fuel, CFB Boiler Burning Coal and Syngas. Part 2. Numerical Simulations of Coal and Syngas Co-Combustion

A Comprehensive, Three-Dimensional Analysis of a Large-Scale, Multi-Fuel, CFB Boiler Burning Coal and Syngas. Part 2. Numerical Simulations of Coal and Syngas Co-Combustion

Intelligent Prediction of Clinker Formation Condition for Steam Boiler Tubes Using Artificial Neural Network

Study on the combustion and NOx emission characteristics of low rank coal in a circulating fluidized bed with post‐combustion

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Study on the combustion and NO_x emission characteristics of low rank coal in a circulating fluidized bed with post‐combustion