摘要
某厂1号炉为330 MW亚临界四角切圆锅炉,采用低氮燃烧器,燃烧器分层布置,上下层间距2 m。入炉煤为准东高钠煤,锅炉满负荷运行时,炉内火焰充满度较高,温度分布与速度分布呈"蝴蝶型",且上层主燃区CO浓度较高,还原性气氛较强,锅炉上层主燃区出现严重结焦现象。针对这一问题,采用改变上层燃烧器一、二次风配风方式对炉内燃烧进行优化调整。结合温度场试验数据与FLUENT(流体动力学)数值模拟的方法,研究了优化前后炉内风速、温度及组份的分布特性。研究表明:燃烧优化调整后上层燃烧器区域CO浓度由0.8%降低至0.5%,且上层燃烧器区域风速分布与温度分布相对收缩,抑制结焦效果显著。
Boiler No. 1 in a power plant is a 330 MW subcritical tangentially-fired one,which adopts low nitrogen burners and a layered arrangement of burners with the spacing between the upper and lower layers being 2 m. The coal fed into the boiler is Zhundong-originated coal with a high sodium content. When the boiler is operating at its full load,the filling degree of the flame in the furnace is relatively high,the temperature and speed distribution assume a 'butterfly shape',the concentration of carbon monoxide in the main combustion zone in the upper layer is comparatively high and the reduction action ability is relatively strong,however,a serious coking phenomenon occurs in the main combustion zone in the upper layer of the boiler. To solve this problem,the primary and secondary air distribution mode of the burners in the upper layer was changed to optimize and make an adjustment of the combustion in the furnace. According to the test data of the temperature field and by making use of the numerical simulation methodprovided in the software Fluent,the distribution characteristics of the temperature,speed and various constituents inside the furnace before and after the optimization were studied. It has been found that after the optimization and adjustment of the combustion inside the furnace,the carbon monoxide concentration in the zone of the burners in the upper layer decreases from 0. 8% to 0. 5% and the speed and temperature distribution region correspondingly reduces,thus making an outstanding achievement in containing the coking. The method above-mentioned can offer reference for anti-coking operation and modification of boilers burning Zhundong-originated coal.
出处
《热能动力工程》
CAS
CSCD
北大核心
2015年第6期903-910,973-974,共8页
Journal of Engineering for Thermal Energy and Power
关键词
准东高钠煤
四角切圆锅炉
分层布置
结焦
数值模拟
蝴蝶型
Zhundong-originated coal with a high sodium content,tangentially-fired boiler,layered arrangement,coking,numerical simulation,butterfly shape
