3-D MODELING OF HEAT AND MASS TRANSFER PROCESS DURING THE COMBUSTION OF SOLID FUEL IN A SWIRL FURNACE

Aliya Askarova,Symbat Bolegenova,Valeriy Maximov,Aizhan Nugymanova,Saltanat Bolegenova,Pavel Šafařík

doi:10.14311/ap.2019.59.0543

Aliya Askarova, Symbat Bolegenova + Show 4 more

Open Access

https://doi.org/10.14311/ap.2019.59.0543

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Abstract

In this work, a comprehensive study of thermal processes and aerodynamic and concentration characteristics of the combustion chamber of the boiler BKZ-75 of the Shakhtinskaya thermal power plant (Kazakhstan) are presented. A comparison of the characteristics of the combustion processes for two cases is given for the direct-flow method of supplying the mixture - the burners are located on opposite-side walls and the swirl-air mixture supplying method - burners with a swirl angle of the air mixture flow and their inclination to the centre of symmetry of the boiler by 30 degrees. The research results allow us to determine the optimal technological parameters of the studied object, to improve the methodology for the numerical study of heat and mass transfer processes in high-temperature and chemically reacting flows in the presence of turbulence, and also develop appropriate technological solutions for installing burner devices (direct-flow or swirl) in the studied combustion chamber.

Highlights

The fuel and energy complex in the economy of any state is the most important component of ensuring the functioning and development of productive forces and, improving the living standards of the population [1]
To conduct computational experiments in the combustion chamber of the BKZ-75 boiler, two cases were investigated: 1) the direct-flow method of supplying an air mixture - burners are located on opposite-side walls; 2) swirl air mixture supplying method - burners with a swirl angle of the air mixture flow and their inclination to the centre of symmetry of the boiler by 30 degrees
With the swirl method of supplying the air mixture, four swirling flows directed from the swirl burners collide with each other in the central part at an angle of 30 degrees (Fig. 3b), and combined, are sent to the exit from the combustion chamber, with the formation of a swirl flow of higher intensity (Fig. 4b)

Summary

Introduction

The fuel and energy complex in the economy of any state is the most important component of ensuring the functioning and development of productive forces and, improving the living standards of the population [1]. In the implementation of a comprehensive study of the processes of burning pulverized coal in the combustion chambers of boilers of industrial facilities (thermal power plants, etc.), the most optimal way is to conduct computational experiments using 3D modelling methods and with the use of a modern computer equipment, computer technology and application software packages [3,4,5,6,7,8,9]. The results of the studies allow us to determine the optimal technological parameters of the investigated object, to improve the methodology for the numerical study of heat and mass transfer processes in high-temperature and chemically reacting flows in the presence of turbulence, and develop appropriate technological solutions for installing burner devices (direct-flow or swirl) in the combustion chamber under study.

Results of Numerical Modeling

C H2 O2 S2 N2

Conclusion