<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Jian Chang</style></author><author><style face="normal" font="default" size="100%">Xin Wang</style></author><author><style face="normal" font="default" size="100%">Zhijian Zhou</style></author><author><style face="normal" font="default" size="100%">Honggang Chen</style></author><author><style face="normal" font="default" size="100%">Yuguang Niu</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">CFD modeling of hydrodynamics, combustion and NOx emission in a tangentially fired pulverized-coal boiler at low load operating conditions</style></title><secondary-title><style face="normal" font="default" size="100%">Advanced Powder Technology</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">cfd</style></keyword><keyword><style  face="normal" font="default" size="100%">combustion</style></keyword><keyword><style  face="normal" font="default" size="100%">Low load</style></keyword><keyword><style  face="normal" font="default" size="100%">NOx emission</style></keyword><keyword><style  face="normal" font="default" size="100%">Pulverized-coal boiler</style></keyword><keyword><style  face="normal" font="default" size="100%">Tangentially fired</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2021</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.sciencedirect.com/science/article/pii/S0921883120305471</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">2</style></number><volume><style face="normal" font="default" size="100%">32</style></volume><pages><style face="normal" font="default" size="100%">290-303</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">With deep peak-load regulations, utility boilers are frequently operated under variable/low load conditions. However, their hydrodynamics, combustion and NOx emission characteristics are uncertain and relevant theoretical guidance are lacking. For this purpose, a comprehensive CFD model including flow, coal combustion and NOx formation is established for a 630 MW tangentially fired pulverized-coal boiler, aiming at solving the problem of decreasing combustion stability and increasing NOx emission in low-load operation. Based on the grid independence and model validation, the flow field, temperature profile, species concentration profile and NOx emission are predicted, and the influences of angle/arrangement of burners are further evaluated. Simulation results indicate that under low-load conditions, residual airflow rotation still persists at the top of boiler regardless of how to adjust the angle/arrangement of burners. With tilting the burner angle upward, flame is more concentrated, combustion becomes more stable, and heat flux rises in the upper zone; the burner arrangement of ABDE gives more uniform temperature distribution in the combustion zone. CO species shows higher content in the combustion zone; the 0° tilt angle gives maximum CO content, followed by the 15° angle, and finally the −15° angle; compared to the ACDE and ABCE arrangement, the ABDE arrangement mode gives much lower CO contents. Burner tilt angle of −15° benefits for lower NOx emission (183 mg/m3) but goes against stable combustion; the burner arrangement mode of ABDE is optimal for the present boiler, which ensures both stable combustion and lower NOx emission (209 mg/m3).</style></abstract></record></records></xml>