Study On Acoustic Soot Blowing Technology

As a new technology, acoustic soot blowing technology is used to clean ashes and soot in boilers and has been largely popularized in some power plants in China. Thoroughly revealing the mechanism of acoustic soot blowing and fully exploring the influence of heat and mass transfer and burning when acoustic soot blowers are used in boilers is advantageous to advance the development of acoustic soot blowing technology. Numerical simulation is used to simulate the two-dimension airflow field of low temperature convection heated surface and firebox in two operating condition. k & Two-equation turbulence model is taken as mathematical model of the airflow field; Mixture fractionlPDF formulation is adopted to model gas burning; Discrete Random Walk Model is introduced to model Turbulent dispersion of particles; Diffusion model is adopted to model Water volatilization; Two Competing Rates Model is used to model char burnout; Kinetics/diffusion-limited Model is chosen for the Combustion of char; P-i model is applied to model radiative heat transfer. In the cause of calculation, The first-order upwind discretization scheme is used for convection; The standard SIMPLE algorithm is adopted for pressure-velocity coupling; To model the influence of airflow field of boilers while acoustic soot blowers are used, a temporally periodic pressure boundary condition is applied to the inlet of acoustic soot blowers. The results coincide with data of testing in essence. To make the scheme of acoustic soot blowers less troubled, application software is presented for optimum designing the structural and acoustic parameter in the paper, including the calculation of bond strength of ashes and soot, optimum design of acoustic soot blowers and design of resonatron. In addition, graphics display is provided for qualitative analysis expediently.