Research On Vacuum Improvement Of Condenser System In 1000MW Unit

According to a 1000 mw unit as an example in this paper, analyze various influence factors of the condenser vacuum, calculate overall heat transfer coefficient of the condenser, It is concluded that the average velocity and tube bundle cleaning degree of impact on the overall heat transfer coefficient obviously. Using FLUENT software to simulate the flow state of condenser water side, the simulation results show that vortex zone exists in the inlet water chamber of high and low pressure condenser, local resistance increasing, which affects the uniformity of water side flow, thus influencing the distribution of tube bundle in speed. Whirlpool area also affects the rubber ball movement, causing gum balls and water in the interior of the condensing zone bundles, influencing the condenser heat transfer effect, which reduces the vacuum. In indoor adding water diversion plate and baffle plate equipped with raised, after the gusset plate, vortex phenomenon is abate and bundle district cooling water flow rate increases. The rubber ball trajectory into also becomes uniform, at the same time most of the cooling tube bundle can be cleaned and beneficial to the improvement of the overall condenser heat transfer effect. After adding the gusset plate with the thickness of 0.15 m, the condenser vacuum increase an average of 0.05 kPa.