论文部分内容阅读
随着锅炉容量的提高,锅炉的尺寸亦增大,从而产生由于受热面膨胀而引起的结构上的困难。法国哈佛尔电站60万瓩锅炉机组中炉膛水冷壁在额定工况下的垂直延伸量达～270毫米,每片水冷壁在水平方向上的热膨胀量达～112毫米(气密封水冷壁)。下面简要地探讨炉膛水冷壁和过热器的热膨胀问题。炉膛水冷壁现代化增压锅炉的炉膛是一密封的箱室。炉膛的四壁受到很大的应力。上述60万瓩锅炉机组的炉膛中烟气的公称压力达～0.03
As the capacity of the boiler increases, the size of the boiler also increases, creating structural difficulties due to expansion of the heated surface. The vertical expansion of the furnace waterwall in the 600,000 瓩 boiler unit at France’s Havel Power Station at nominal conditions amounts to ~ 270 mm and the thermal expansion of each waterwall in the horizontal direction amounts to ~ 112 mm (gas-sealed waterwall). The following briefly discusses the furnace wall water wall and superheater thermal expansion problems. Furnace water wall The hearth of a modern pressurized boiler is a sealed chamber. The walls of the hearth are subject to great stress. The nominal pressure of the flue gas in the hearth of the above-mentioned 600,000 瓩 boiler unit was ~0.03