Abstract
The paper presents results of numerical modelling of pulverized coal combustion process in the coal-fired boiler. In the numerical model, coal combustion process includes particle heating, devolatilization, char combustion, as well as turbulent flow and radiative heat transfer was modelled. Presented modelling results were carried out using the Open Source CFD code - Code_Saturne created and developed by EDF R&D and were used to study the combustion of coal in power plant boiler with the objective of simulating the operational conditions and identifying factors of inefficiency. The behaviour of the flow of air and pulverized coal through the burners was modelled, and the three-dimensional flue gas flow through the combustion chamber and heat exchangers was reproduced in the simulation.
Highlights
The coal fired power plants are facing new big challenge resulting from environmental concerns
The analysis results of combustion process using CFD modelling can be used in optimization processes eg. to proper prediction of NOx reduction using primary or secondary methods [6, 7], to verify actual operating conditions and them impact on the thermo-flow processes inside the coal boilers [8,9,10], as well as to analyse different types of fuels as biomass, waste etc. [11,12,13]
The simulation of pulverized coal combustion in a power plant boiler was performed in the Open Source CFD code – Code_Saturne, created and developed by EDF R&D [14,15]
Summary
The coal fired power plants are facing new big challenge resulting from environmental concerns. The units must meet strict limits for emissions of gaseous pollutants keeping efficiency on the high level. Applying methods for reducing pollutant emission in the wrong way can greatly affect the process quality and reduce production efficiency. The development of computer modelling techniques, especially the CFD methods (Computational Fluid Dynamics) allows to conduct the accurate analysis of coal combustion process and are widely used in modelling of front-fired boilers [1,2] as well as tangentially-fired boilers [3,4,5]. A complete information about the combustion process resulting from CFD model is helpful in the verification of combustion process quality. The analysis results of combustion process using CFD modelling can be used in optimization processes eg. The analysis results of combustion process using CFD modelling can be used in optimization processes eg. to proper prediction of NOx reduction using primary or secondary methods [6, 7], to verify actual operating conditions and them impact on the thermo-flow processes inside the coal boilers [8,9,10], as well as to analyse different types of fuels as biomass, waste etc. [11,12,13]
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