Simulated bicontinuous tree-shaped pipe bundle type steam condenser

Abstract

The invention provides a simulated bicontinuous tree-shaped pipe bundle type steam condenser, which belongs to the technical field of heat exchangers. The simulated bicontinuous tree-shaped pipe bundle type steam condenser consists of a plurality of heat exchange pipes, a front end pipe plate, a middle pipe plate, a back end pipe plate, a case assembly, a steam baffle plate, a front water chamber, a back water chamber and the like. The invention is characterized in that the distribution of the heat exchange pipes of the steam condenser pipe bundle on the pipe plate is in simulated bicontinuous tree-shaped distribution, and the heat exchange pipes are formed by simulated bicontinuous tree loose tree branch pipe bundle region pipe bundles, simulated bicontinuous tree dense pipe bundle region pipe bundles, gradually reducing air cooling region pipe bundles and the like, wherein a simulated bicontinuous tree loose tree branch pipe bundle region consists of simulated tree branch-shaped pipe bundles with the upwards inclined upper part, simulated tree branch-shaped pipe bundles with the horizontal lower part, simulated tree branch-shaped pipe bundles with the downwards bottom and the like, the simulated bicontinuous tree-shaped span ratio is 0.3 to 0.4, the height to width ratio of the simulated bicontinuous tree-shaped pipe bundles is 1.1 to 2.0, the gap average permeability is 0.3 to 0.6, the peripheral average voidage is 0.2 to 0.4, the simulated tree branch relative width is 4 to 12, and the simulated tree branch relative gap is 2.5 to 5. The invention has the advantages of uniform and eddy-free pipe bundle steam flow flowing field, small steam resistance of the case side, uniform heat load distribution, small condensing water supercooling degree, high heat transfer coefficient and high operation vacuum degree. The heat exchange coefficient can be 10 to 20 percent higher than the HEI calculation value, and the machine set energy-saving effect is obvious.

Description

technical field [0001] The invention relates to a bionic double-connected tree-shaped tube-bundle condenser, in particular to a bionic double-connected tree-shaped tube-bundle type in which the arrangement of cooling tube bundles in the condenser of a large unit of a power station is a bionic double-connected tree-shaped structure condenser. Background technique [0002] The power plant condenser is a shell-and-tube heat exchanger, which is an important component of thermal power generation and nuclear power units. Its function is to condense the exhaust steam discharged from the steam turbine into water and establish and maintain a certain vacuum at the steam exhaust port of the steam turbine. value. The rationality of the cooling tube bundle arrangement of the condenser has an important impact on the steam condensation process, and has a greater impact on its heat transfer performance and energy consumption of the unit. Unreasonable arrangement of tube bundles will lead ...

AI Technical Summary

Problems solved by technology

Numerical analysis shows that the heat transfer coefficient of unreasonable condenser tube bundle arrangement is 10-20% lower than the value calculated according to the HEI standard, and some (such as the Shuangling tube bundle arrangement type, etc.) even reach more than 30%, which significantly affects Unit output and economy

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