A combined bionic anti-wear h-fin elliptical flue gas heat exchange tube

Abstract

The invention discloses a combined bionic anti-abrasion H-shaped fin elliptical flue gas heat exchange tube which comprises more than two rows of elliptical tubes in the flowing direction of gas and fins arranged on the two sides of the elliptical tubes, wherein a plurality of pairs of semispherical dimples are arranged on the windward sides of the fins; first through holes penetrating through the fins are formed in the bottoms of the semispherical dimples; a plurality of eddy generators are arranged on the leeward sides of the fins; a through hole adjacent to each eddy generator is formed in one side of the eddy generator. According to the flue gas heat exchange tube, the elliptical tubes are used as base tubes, the fins are arranged on the inner two sides of the elliptical tubes, the semispherical dimples and the eddy generators are arranged on the fins, and by the dimples, the flowing resistance can be effectively reduced to avoid the formation of large eddy turbulence in a flow field; in addition, by the novel combined fin structure, the comprehensive heat exchange efficiency can be effectively improved, and tail soot formation and tube abrasion can be greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of heat exchangers, in particular to a combined bionic wear-resistant H-fin elliptical flue gas heat exchange tube. Background technique [0002] my country's power station boilers are mainly coal-fired, while power coal is mostly low-quality coal, and the concentration of fly ash in the flue gas is high. Tail flue economizer is one of the main equipment for low temperature heat exchange. In the tail flue, there are fly ash, coal particles, sulfur and other components in the flue gas, the flue gas flows outside the pipe, and the water flows inside the pipe. The existence of fly ash will lead to serious ash accumulation in the heat exchanger, which will deteriorate the heat transfer effect, increase the exhaust temperature, and reduce the efficiency of the boiler. At the same time, the flue gas resistance will also increase accordingly, which will increase the power consumption of the induced draft fan. In ...

AI Technical Summary

Problems solved by technology

However, while this vortex generator improves the heat transfer performance, it will inevitably cause a substantial increase in flow resistance, which means a substantial increase in the power consumption of the compressor.

If the increase in power consumption of the compressor exceeds the increase in heat transfer, from the perspective of the overall effect of the heat transfer process, this technology is actually not energy-saving.

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