摘要
为降低四角切圆燃烧锅炉水平烟道流速偏差,文中采用一种新型扭曲分隔屏的方法,分隔屏在空间扭曲角度为45°。在模型锅炉上,利用5孔探针测量了水平烟道内的气流速度分布。测量结果显示,采用扭曲分隔屏可将水平烟道中的最大速度偏差减少60%左右,最大偏差系数ε仅为0.4。与分隔屏偏置的方法相比,对水平烟道最大速度偏差系数的抑制作用更大,其最大偏差系数ε减少了1/3。由于更适应流体流动的特性,因此采用扭曲分隔屏可使水平烟道速度分布更趋均匀。研究表明,在合适的扭曲角度和过渡面下,采用扭曲分隔屏可以将四角喷燃锅炉水平烟道烟速偏差降到最小。数值模拟的结果表明,采用扭曲分隔屏,可大幅度降低四角喷燃过炉水平烟道的速度偏差。
A new method with screwy superheater（SH） panels was developed to improve the situation of flow velocity deviation of tangentially fired boiler horizontal gas pass. The screwy SH panels was twisted about 45° in space. Through an experiment on model boiler, the velocity deviation of the tangentially fired boiler horizontal gas pass was cut down about 60% using the screwy SH panels, the most velocity deviation coefficient is only 0.4. In contrast with biasing panels, the screwy SH panels are better in reducing the most velocity deviation of the tangentially fired boiler horizontal gas pass. The most velocity deviation is cut down 33% compared with biasing SH panels. Research expressed, if the twist angle and the intergradation surface of the screwy SH panels are suitable the velocity deviation of the tangentially fired boiler horizontal gas pass can be cut down to zero. The numerical simulation results also express that the screwy SH panels can remarkably cut down the velocity deviation of the tangentially fired boiler horizontal gas pass.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2007年第17期34-38,共5页
Proceedings of the CSEE
基金
上海市自然科学基金项目(04ZR14076)
上海市教委重点研究项目(05ZZ55)
上海市重点学科建设项目(P1302)。
关键词
锅炉
烟速偏差
分隔屏
烟道
温度
扭曲
boiler
gas velocity deviation
panel superheater
gas pass
temperature
twist
