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在超临界“W”火焰锅炉水冷壁上设计安装了监测管内外壁温及管内工质温度的测量装置,得到了优化内螺纹垂直水冷壁管壁温、管内工质温度及典型负荷下炉膛截面热负荷分布等实炉运行数据。试验及研究结果表明:在机组由亚临界到超临界的转换过程中,管水冷壁管内外壁温与管内工质温度呈现剧烈变化状态,在超临界负荷下,内壁与工质的换热明显减弱,水冷壁的安全性受到威胁;管内外壁温差及内壁与工质温差沿炉膛宽度和深度方向均呈现中间高两侧低的分布,水冷壁向火侧管外壁温度大大低于设计值,水冷壁有较大的安全裕量,实际炉膛截面热负荷分布介于两种设计热负荷值之间。
In the supercritical “W ” flame boiler water wall design and installation of the monitoring tube wall temperature and tube temperature of the measuring device, obtained by optimizing the vertical wall temperature of the internal thread wall temperature, tube temperature and the typical load under the furnace Section heat load distribution and other real furnace operation data. The experimental results and the experimental results show that during the transition from subcritical to supercritical units, the temperature inside and outside the pipe wall and the working fluid temperature in the pipe show a drastic change. Under the supercritical load, the heat transfer between the inner wall and the working fluid is obviously weakened , The safety of the water wall is threatened; the temperature difference between the inner and outer walls of the pipe and the temperature difference between the inner wall and the working fluid are low on both sides along the width and depth of the hearth; the temperature on the outer wall of the water side wall to the fire side is much lower than the design value; Have greater safety margin, the actual cross-section of the furnace heat load distribution between the two design heat load values.