【摘要】 双区燃烧是降低NOx排放,防止炉内结渣的一项新技术。利用CFD软件平台,采用数值模拟方法对其某电厂200 mm四角切圆锅炉改造前后炉内燃烧过程进行研究。计算结果表明:采用双区燃烧技术使炉膛中形成了温度,组分和颗粒相参数显著不同的中心区和近壁区。由于附壁射流的作用,使得高温区集中在炉膛中部,有效的防止了锅炉结渣;改造后炉内有比常规燃烧方式锅炉更大的还原气氛区域,抑制了NOx的产生,使其排放降低34.6%。更多还原

【Abstract】 Double-zone combustion is a new technique to reduce NOx and slagging.Numerical simulation of combustion process in a 200 MW coal-fired boiler is performed on CFD software platform.Results show that after the reconstruction,there are two zones formed in the boiler,central zone and near wall zone,whose distribution of temperature,component and particles are very different.Because of combined-jet flow,the high temperature zone is concentrate on the center of the boiler,and the slagging problem can be ameliorated.The new combustor is applied and the boiler can reach a much lower NOx emission.更多还原