Simulation of Pulverized Coal Combustion Process Considering Turbulence-Radiation Interaction

Area of Science:

• * Combustion Engineering
• * Thermal Engineering
• * Computational Fluid Dynamics

Background:

• * Pulverized coal combustion boilers are critical for power generation.
• * Turbulence-radiation interaction (TRI) significantly impacts combustion dynamics.
• * Accurate modeling of TRI is essential for optimizing boiler performance.

Purpose of the Study:

• * To investigate the influence of turbulence-radiation interaction (TRI) on pulverized coal combustion.
• * To modify the TRI model by introducing optical factors for enhanced accuracy.
• * To analyze the effect of optical thickness on radiative heat transfer and temperature distribution.

Main Methods:

• * Combined field testing and numerical simulation of a 350 MW pulverized coal boiler.
• * Modification of the TRI model using optical factors.
• * Sensitivity analysis of TRI to particle optical thickness.

Main Results:

• * Incorporating TRI reduces cross-section temperature by 49.85 K compared to traditional models.
• * TRI consideration improves temperature prediction accuracy, reducing deviation from experimental data by 1.54%.
• * Increased optical thickness with TRI enhances radiative heat transfer and furnace temperature in dense particle areas.

Conclusions:

• * The modified TRI model provides a more realistic representation of temperature distribution in pulverized coal furnaces.
• * TRI effects become more pronounced with increased particle load and optical thickness.
• * Accurate modeling of TRI is vital for optimizing combustion efficiency and boiler design.