Integrally brazed finned tube structure

Abstract

The invention relates to an air-cooled condenser. The invention relates to a finned tube structure, and aims to provide an integrally brazed finned tube structure which has the characteristics of high rigidity, good sealing effect and no increase of air side wind resistance. According to the technical scheme, the integrally-brazed finned tube structure comprises a plurality of base tubes arranged in parallel; the heat exchanger is characterized in that fin units are arranged on the tube walls of the two sides of each base tube, and one fin unit is shared between every two adjacent base tubes.

Description

technical field [0001] The invention relates to an air-cooled condenser, in particular to an integrally brazed finned tube structure. Background technique [0002] The large flat-tube finned tubes currently used in A-frame air-cooled condensers mainly include the following two structures: Structure 1 (see Figure 8 , Figure 9 ), the finned tube and the finned tube are separated from each other, but the two ends of the finned tube are welded to the tube sheet to form a whole; structure two (see Figure 10 , Figure 11 ), an aluminum plate 5 is brazed at the tip of the adjacent finned tube, several finned tubes are connected as a whole through the aluminum plate, and the tube plate is welded at both ends of the finned tube simultaneously. The defect of above-mentioned two kinds of structures is: [0003] In the first structure, since the adjacent finned tubes are not directly connected, the overall rigidity is low, and the finned tubes are easily deformed by the lateral fo...

AI Technical Summary

Problems solved by technology

[0005] 1. The aluminum plate between the finned tubes leads to an increase in the air friction surface. Through finite element analysis, it is found that under the same conditions, compared with the first finned tube structure, the second finned tube structure increases About 30% of the static pressure;

[0006] 2. The cost of the aluminum plate is high, but the heat transfer effect is little improved; according to the heat transfer principle, the temperature difference is the driving force for heat transfer, the temperature at the root of the fin is high, and the temperature at the tip of the wing is close to the ambient temperature, and the aluminum plate is located at the tip of the wing. It is close to the ambient temperature, so the heat transfer effect is relatively poor; therefore, the improvement of heat transfer effect is negative optimization compared with the increase of power consumption caused by the increase of static pressure

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