Micro-inclined condenser tube bundle arrangement method capable of reducing thermal resistance

Abstract

The invention relates to a micro-inclined condenser tube bundle arrangement method capable of reducing thermal resistance. The method is based on the basic principle of the heat transfer theory, steam is condensed on the outer wall of a condenser cooling water tube after being discharged from a last-stage blade of a steam turbine, and condensed water can be gathered on the surface of a heat exchange tube and evolved into a water film, so that the heat exchange thermal resistance of the tube bundle is increased. When the tube bundle has a preset inclination angle, the condensation water film slides down along the tube wall when increased to a set thickness, the thickness of the water film is continuously increased in the downward sliding process, and when the gravity is larger than the component force of the adsorption force in the vertical direction, the water film drips down. A part of water film thickness can be reduced in the downward sliding process, impurities in the tubes can flow out under the action of gravity, and the heat transfer efficiency of the heat exchange tube bundle is improved. According to the principle of hydraulics, small water drops attached to the condenser tube bundle are subjected to stress analysis, the appropriate micro-inclined arrangement angle of the condenser tube bundle can be directly solved through a function, calculation programming is easy, and the method is of great significance in optimizing the arrangement mode of the condenser tube bundle and improving the heat transfer performance of the condenser.

Description

technical field [0001] The invention belongs to the field of power plant boiler and steam turbine systems, and in particular relates to a slightly inclined condenser tube bundle arrangement method which can reduce thermal resistance. Background technique [0002] In a thermal power plant, the heat exchange efficiency of the condenser has a great influence on the power generation efficiency of the turbogenerator unit. Statistics show that the heat consumption of the unit increases by about 1.5% for every 1% reduction in the vacuum degree of the thermal power unit. At the same time, if the heat exchange efficiency of the condenser is seriously lower than the design value, it will cause the exhaust temperature of the steam turbine to rise, and the long-term operation will cause the axial displacement of the steam turbine to change, and in severe cases, it will even cause additional vibration of the steam turbine, which will affect the safe operation of the unit . Therefore, im...

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Problems solved by technology

The condensed water will not leave the surface of the heat exchange tube immediately, but will gather on the surface of the heat exchange tube and evolve into a water film, and the water film will gradually gather at the lower edge of the heat exchange tube. It will drip when it is high, which increases the heat transfer resistance of the condenser tube bundle, reduces the heat transfer efficiency of the condenser, and affects the economy and safety of the unit operation.

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