【摘要】 电站热力系统中相当数量疏水管路接口排入凝汽器或扩容器,疏水排入的过程中涉及到流体动力、扩散、闪蒸及两相流等多种复杂问题。疏水处理不当往往会引起凝汽器内原热平衡的破坏,使凝汽器内凝结饱和温度提高,导致背压升高,影响机组出力;还会引起冲击、振动、热胀,造成冷凝管破损、壳体开裂等问题;严重时甚至还会损坏汽轮机叶片。但长期以来,国内外对这方面的理论研究较为鲜见,很难用单纯的理论计算方法来解决。该文分析了疏水排入的位置、能级和流速,提出了处理各种疏水的原则和方法,完善热力系统及凝汽器的设计,确保电厂安全可靠运行。图3表2参4更多还原

【Abstract】 In the thermal system of a power plant, there are quite a number of drain pipes that discharge into the condenser or into a flash tank. Hydrodynamic, expansion, flasing two-phase flow and many other problems are concerned with discharge of drain water. In case of improper handling, the thermal equilibrium in the condenser may be disturbed, which may cause raise the saturation temperature in the condenser to rise, leading to an increase of the back-pressure and thus affect the set’s output; moreover, shocks may be incited, vibration expansion problems may occur that may cause condenser tubes to break, casings to burst, as well as other problems and in serious cases even turbine blades may get damaged. But since long, whether in this country or abroad, few theoretical research work has been dealing with such problems, and it is rather difficult to solve them by simple theoretical calculation. Locations of drain discharge, energy level and flow velocity are discussed in this paper, principles and methods of dealing with drains are suggested, as well as ways of perfecting the design of thermal systems and condensers, so that the power plant’s safe and reliable operation may get warranted.更多还原