660MW超超临界旋流对冲燃煤锅炉NO_x分布数值模拟

Numerical Simulation on NO_x Distribution in a 660MW Ultra Supercritical Opposed Firing Boiler

利用Ansys Fluent 14.0软件对某电厂660MW超超临界旋流燃煤锅炉进行NOx生成规律的数值模拟,并将数值模拟结果与现场实际测量结果进行了比较.结果表明:数值模拟结果与现场实际测量结果吻合较好,验证了数值模拟结果的有效性;第1层燃烧器区域生成NOx的体积分数比其他2层高,燃烧器出口附近NOx的体积分数迅速升高到0.001;从第1层燃烧器开始沿炉膛高度方向,NOx体积分数逐渐降低,炉内NOx体积分数最高的区域位于后墙第2层燃烧器上方.

The distribution of NO, concentration in a 660 MW ultra supercritical opposed firing boiler was numerically simulated using Ansys fluent 14.0 software, of which the results were compared with actual measurements. Results show that the simulated results agree well with actual measurements, proving the simulation method to be effective. NOx concentration in combustion zone of the first layer is higher than other two layers, which, at the combustor outlet, gets up to 0. 001 rapidly; volumetric concentration of NOx reduces gradually along the furnace height, starting from the combustor in the first layer; maximum NOx concentration appears in the area near rear wall above combustion zone of the second layer.