摘要
研究了国产600 MW直流锅炉分配集箱水冷壁管在超临界压力下的流量分配特性。试验参数为:压力p=23~25MPa,质量流速G=400~1 200 kg/(m2.s),工质温度t=10~400℃。试验研究了工质压力、质量流速和工质温度对分配集箱垂直水冷壁管流量分配特性的影响。试验结果表明:随着质量流速的增加,垂直水冷壁管间流量分配的均匀性增加;在拟临界点附近,流量分配不均匀性有一阶跃增加,而且随着压力的增加,流量分配不均匀性在拟临界点的阶跃增加现象变弱。利用分配集箱并联支管的离散模型计算了分配集箱垂直水冷壁管内的流量分配,计算结果与试验数据吻合。
An investigation was conducted of the flow distribution characteristics of distribution header water-wall tubes under a supercritical pressure for a home-made 600 MW once-through boiler.The test parameters can be listed as follows: pressure p=23～25 MPa,mass flow rate G=400～1200 kg/(m^2.s),working medium temperature t=10～400 ℃.An experimental study has been conducted of the impact of working medium pressure,mass flow rate and working medium temperature on the vertical water-wall tube flow distribution characteristics of the distribution header.The test results show that with an increase in mass flow rate,the uniformity of flow distribution among the vertical water-wall tubes could be enhanced.The non-uniformity of flow distribution will undergo a step increase near the quasi-critical points.Moreover,with an increasing pressure,the above-mentioned step increase will become weaker.By employing a discrete model of the parallel-connected branch tubes of the distribution header,the flow distribution among the distribution header vertical water-wall tubes was calculated and the calculation results are in good agreement with the test ones.
出处
《热能动力工程》
CAS
CSCD
北大核心
2006年第3期299-302,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)
关键词
直流锅炉
超临界压力
分配集箱
垂直水冷壁管
once-through boiler,supercritical pressure,distribution header,vertical water-wall tubes
