Simulated bicontinuous tree-shaped pipe bundle type steam condenser

A condenser and tube bundle type technology, which is applied in the field of bionic double-connected tree tube bundle type condensers, can solve the problems affecting the output and economy of the unit, low heat transfer coefficient, etc., and achieve obvious energy saving effect and steam flow field. Uniform, no eddy current, uniform heat load distribution

Active Publication Date: 2010-10-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Simulated bicontinuous tree-shaped pipe bundle type steam condenser
  • Simulated bicontinuous tree-shaped pipe bundle type steam condenser
  • Simulated bicontinuous tree-shaped pipe bundle type steam condenser

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Experimental program
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Effect test

Embodiment 1

[0037] figure 1 It is a structural schematic diagram of a condenser according to an embodiment of the present invention. exist figure 1 Among them, 1 is the water chamber before the condenser (2 pieces in total), 2 is the front tube plate of the condenser (2 pieces in total), and 3 is a number of heat exchange tubes (there are 22992 heat exchange tubes in this embodiment, figure 1 Only 2 heat exchange tubes are schematically drawn in the figure), 4 is the intermediate tube plate (2x13 pieces in total), 5 is the condenser shell assembly, 6 is the water chamber after the condenser (2 pieces in total), and 7 is the condensing steam The tube plate at the rear end of the device (2 pieces in total), and 8 is the connecting part (neck) between the condenser and the steam turbine. The heat exchange tubes pass through the tube holes of the middle tube sheet and are connected to the tube sheets at both ends, and the connection between the heat exchange tubes and the tube sheets at bot...

Embodiment 2

[0060] Figure 13 It is a schematic diagram of the bionic double-connected tree arrangement of the second embodiment of the present invention. Figure 14 It is a schematic diagram of the middle tube sheet of the bionic double-connected tree-shaped tube bundle in the second embodiment of the present invention. exist Figure 13 Among them, the tube bundle arrangement in this embodiment is two bionic double-connected tree-shaped arrangements arranged side by side symmetrically, each bionic double-connected tree-shaped tube bundle is composed of 11602 heat exchange tubes, and the tube bundle arrangement in this embodiment has a total of 23204 heat exchange tubes.

[0061] exist Figure 13 and Figure 14 Among them, B1 is the distance between the middle line of a bionic tree-shaped trunk and the inner wall of the nearest shell, and B2 is the distance between the middle lines of two bionic tree-shaped trunks in a bionic double-connected tree-shaped tube bundle (bionic double-conn...

Embodiment 3

[0064] Figure 15 It is a schematic diagram of the bionic double-connected tree arrangement of Embodiment 3 of the present invention. Figure 16 It is a schematic diagram of the middle tube sheet of the bionic double-connected tree-shaped tube bundle in the second embodiment of the present invention. exist Figure 15 Among them, the arrangement of the tube bundles in this embodiment is two bionic double-connected tree arrangements arranged symmetrically side by side.

[0065] The difference between Embodiment 3 and Embodiment 1 is that the bionic double-connected tree-shaped tube bundle in Embodiment 1 is a structure of bisected cooling water double tubes, while the bionic double-connected tree-shaped tube bundle in Embodiment 3 is a single cooling water tube program structure.

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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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F28B1/00
Inventor 孟继安曾辉
Owner TSINGHUA UNIV
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