摘要
以某1 000 MW超超临界塔式锅炉为例,采用数值模拟手段研究了燃烧设备对锅炉受热面热偏差的影响,并将数值模拟结果与实际运行数据进行了对比。结果表明:四角切圆燃烧技术在炉内形成的高温高速烟气圆环是受热面热偏差呈马鞍形分布的主要原因;改变燃烧器中心夹角,将影响该圆环的位置和大小,进而影响受热面热偏差的分布;采用反吹式水平浓淡煤粉燃烧器,减小偏置辅助风偏置角度可以起到减小燃烧器中心夹角的效果;分离燃尽风反切可以有效减小锅炉烟气侧热偏差。
Taking a 1 000 MW ultra supercritical tower boiler as an example, the influence of burner design on thermal deviation of the heating surfaces was studied by means of numerical simulation, and subsequently the simulation results were compared with actural operation data of the boiler. Results show that the thermal deviation of heating surfaces presents the saddle distribution due to the flue gas ring formed in the furnace caused by tangential firing, where both the flue gas temperature and velocity are high. Changing the installation angle of burner would affect the position and size of the flue gas ring, and then further affect the distribution of the thermal deviation. The effect of installation angle of burner could be reduced by adopting the blowback type of pulverized coal burner and reducing the angle of the bias air. Reversely and horizontally swinging the separated overfire air could effectively reduce the thermal deviation on the flue gas side.
作者
肖琨
辛娜娜
张建文
XIAO Kun;XIN Nana;ZHANG Jianwen(Shanghai Boiler Works Co.,Ltd.,Shanghai 200245,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2019年第11期865-869,905,共6页
Journal of Chinese Society of Power Engineering
关键词
塔式锅炉
燃烧设备
热偏差
数值模拟
tower boiler
burner
thermal deviation
numerical analysis
