Influence of the outer secondary air vane angle on the gas/particle flow characteristics near the do

A three-component particle-dynamics anemometer is used to measure, in the near-burner region, the influence of the outer secondary air vane angle on the gas/particle flow characteristics of a double swirl flow burner, in conjunction with a gas/particle two-phase test facility. Velocities, particle volume flux profiles and normalized particle number concentrations were obtained. For three different outer secondary air vane angles, annular recirculation zones formed only in the region of r/d = 0.3–0.6 at x/d = 0.1–0.3. With a decreasing outer secondary air vane angle, the peaks of (RMS) root mean square axial fluctuation velocities, radial mean velocities near the wall, RMS radial fluctuation velocities and tangential velocities all increased, and the recirculation increased slightly. There was a low particle volume flux in the central zone of the burner. At x/d = 0.1–1.0, the profiles of particle volume flux had two peaks in the secondary air flow zone and near the wall, and the two peaks increased as the outer secondary air vane angle decreased. In the section x/d = 0.1–0.5, the particle diameter in the central zone of the burner was always less than the particle diameter at other locations.

[1]  Govinda R. Timilsina,et al.  A divisia decomposition analysis of NOx emission intensities for the power sector in Thailand and South Korea , 1998 .

[2]  K. Cen,et al.  Experimental investigation on flow structures and mixing mechanisms of a gas-solid burner jet , 2005 .

[3]  Roman Weber,et al.  Assessment of turbulence modeling for engineering prediction of swirling vortices in the near burner zone , 1990 .

[4]  Martin Sommerfeld,et al.  Wall roughness effects on pneumatic conveying of spherical particles in a narrow horizontal channel , 2004 .

[5]  S. Oka,et al.  Experimental and numerical investigation of gaseous fuel combustion in swirl chamber , 2005 .

[6]  Sun Rui,et al.  Effect of primary air flow types on particle distributions in the near swirl burner region , 2002 .

[7]  Sun Rui,et al.  Influence of division cone angles between the fuel-rich and the fuel-lean ducts on gas–particle flow and combustion near swirl burners , 2002 .

[8]  Klaus R. G. Hein,et al.  Development of an air staging technology to reduce NOx emissions in grate fired boilers , 2005 .

[9]  B. Zhong,et al.  Effects of fuel characteristics on the NO reduction during the reburning with coals , 2002 .

[10]  Zhichao Chen,et al.  Study of the influence of vane angle on flow, gas species, temperature, and char burnout in a 200 MWe lignite-fired boiler , 2010 .

[11]  Jinchi Li,et al.  Experimental study of solid–liquid two-phase flow in a hydrocyclone , 1999 .

[12]  Shaohua Wu,et al.  Gas/particle flow characteristics of a centrally fuel rich swirl coal combustion burner , 2008 .

[13]  Udo Fritsching,et al.  Measurement of phase interaction in dispersed gas/particle two-phase flow , 2001 .

[14]  Zhengqi Li,et al.  Measurement of Gas Species, Temperatures, Coal Burnout, and Wall Heat Fluxes in a 200 MWe Lignite-Fired Boiler with Different Overfire Air Damper Openings , 2009 .

[15]  Zhengchun Lin,et al.  PDA research on a novel pulverized coal combustion technology for a large utility boiler , 2010 .

[16]  Rachid Méchi,et al.  Extension of the zonal method to inhomogeneous non-grey semi-transparent medium , 2010 .

[17]  Song Hu,et al.  An experimental research on boiler combustion performance , 2000 .

[18]  Yang Yao,et al.  Gas/particle flow characteristics of two swirl burners , 2009 .

[19]  Shaohua Wu,et al.  The influence of fuel bias in the primary air duct on the gas/particle flow characteristics near the swirl burner region , 2008 .

[20]  Changfu You,et al.  Effect of Operation Parameters on the Slagging near Swirl Coal Burner Throat , 2006 .

[21]  Zhichao Chen,et al.  Measurement of gas species, temperatures, char burnout, and wall heat fluxes in a 200-MWe lignite-fired boiler at different loads , 2010 .

[22]  I. Palacín,et al.  PARTICLE CONCENTRATION AND LOCAL MASS FLUX MEASUREMENTS IN TWO-PHASE FLOWS WITH PDA. APPLICATION TO A STUDY ON THE DISPERSION OF SPHERICAL PARTICLES IN A TURBULENT AIR JET , 2002 .

[23]  Anders Mårtensson.  Operator-guidance systems for industrial processes: A case study evaluating impact on energy use and NOx control , 1996 .

[24]  S. Oka,et al.  Entrainment of Cold Gas Into Turbulent Premixed Acetylene Flame , 2001 .

[25]  Alessandro Franco,et al.  The future challenges for “clean coal technologies”: Joining efficiency increase and pollutant emission control , 2009 .

[26]  Choongsik Bae,et al.  The influence of airflow on fuel spray characteristics from a slit injector , 2007 .