超临界变压运行直流锅炉中间集箱分配特性的试验研究  

Experimental Study of Intermediate Header Flow Distribution Characteristics of a Supercritical Once-through Boiler Operating at Variable Pressures

作　　者：朱玉琴[1] 毕勤成[2] 陈听宽[2] 

机构地区：[1]西安石油大学石油炼化工程技术研究中心,陕西西安710065 [2]西安交通大学动力工程多相流国家重点试验室,陕西西安710049

出　　处：《热能动力工程》2009年第1期81-84,共4页Journal of Engineering for Thermal Energy and Power

基　　金：国家自然科学基金资助项目(50323001)

摘　　要：针对600MW超临界锅炉炉膛下部的螺旋管圈水冷壁与炉膛上部垂直管水冷壁之间过渡联接的中间集箱的结构和参数特点,利用空气-水模拟了超临界锅炉在35%ECR、50%ECR和75%ECR负荷下气-液两相流在中间集箱中的分配特性。通过观察和高速摄影法,对分配集箱并联支管中的流型进行了测量和分析。采用快关阀门法和摩擦阻力法分别测量了各支管的含气率和流量。试验结果表明,在3种工况下,入口干度x=0.7～0.95的范围内,空气-水两相流通过分配集箱并联支管内的流量分配较为均匀,绝大多数情况下流量偏差小于10%。In the light of the structural and parameter features of an intermediate header serving as a transition connection between the spiral coil-tube water-wall at the lower part of the furnace and the vertical tube water-wall at the upper part of the fur-nace in a 600 MW supercritical boiler,the distribution characteristics of gas-liquid two-phase flows in the intermediate header of the supercritical boiler at a load of 35% ECR (Economical Continuous Rating) ,50% ECR and 75% ECR were simulated by using an air-water test loop.Through observations and a high-speed photographic method,the flow pattern in parallel branch tubes of a distribution header was measured and analyzed. By using a quick-closing valve and friction re-sistance method,measured respectively were the phase and flow distribution among various branch tubes. The test results show that at three operating conditions and with inlet dryness ranging from x = 0.7 to 0.95,the flow distribution of the air-water two-phase flows passing through the parallel branch tubes of the distribution header is comparatively uniform,and in most cases,the flow rate deviation is less than 10%.

关 键 词：超临界直流锅炉 集箱 分配特性 空气-水两相流 

分 类 号：TK229.5[动力工程及工程热物理—动力机械及工程]