Structure improved type H-shaped finned tube

Abstract

The invention discloses a structure improved type H-shaped finned tube which comprises a round base tube and a fin set which is arranged in the axial direction of the base tube and is connected to theouter wall of the base tube. The fin set includes two rectangular fins which are in left-right symmetry but are different in the front-back direction in the flue gas flowing direction. Each pin is connected with the outer wall of the base tube through a groove formed in the inner side of the side, close to the base tube, of the fin. The two fins are located on the same horizontal plane perpendicular to the axial direction of the base tube, and a clearance is formed between the two fins. A ball protrusion is arranged on each of the left side and the right side of the windward side of each fin,and a rectangular small-wing vortex generator is arranged on the leeward side of each fin. Due to the existence of the ball protrusions, pressure losses can be effectively reduced, large-vortex turbulent flow can be prevented from being formed in the flowing process, when fluid flows through the positions near the ball protrusions, vortexes in a flow field can be sucked away by pits in the back faces of the ball protrusions, forming of larger vortexes is prevented, and the resistance can be reduced; and when flue gas flows through the rectangular small-wing vortex generators, vortexes are formed by fluid, disturbance is generated, a boundary layer cannot be developed continuously, and the heat exchange enhancing purpose is achieved.

Description

technical field [0001] The invention belongs to the technical field of heat exchangers for flue gas waste heat utilization, and is suitable for heat exchange equipment and heating equipment in industries such as energy, power, refrigeration, chemical industry, smelting, petroleum, etc., and specifically relates to a structure-improved H-shaped finned tube. Background technique [0002] With the sustained and rapid development of my country's economy, the problem of energy supply shortage has become increasingly prominent, and energy conservation, emission reduction and consumption reduction have become the inevitable requirements of my country's economic and social development. As an important part of power, petroleum, chemical, refrigeration, metallurgy, and even aviation, rocket and other industrial processes, heat exchangers are of great significance for their safe and efficient operation. In various heat exchange equipment, increasing the heat exchange area through fins ...

AI Technical Summary

Problems solved by technology

[0006] Although the H-shaped finned tube has good anti-dusting ability and anti-wear performance, under the ash-laden airflow, due to the viscosity of the fluid itself and the existence of the reverse pressure gradient, the flow will inevitably separate, and the leeward side of the finned tube will form The vortex stagnation zone, so that the ash particles in the ash-laden airflow continue to accumulate on the leeward side, resulting in a large amount of local ash accumulation, which seriously affects the heat transfer efficiency of the finned tube and the safe and efficient operation of the heat exchanger

Traditional H-shaped fins have their inherent disadvantages. For example, the four corners outside the fin group are at right angles, which will increase the flow resistance; Heat transfer deteriorates, reducing heat transfer efficiency; backflow phenomenon makes dust accumulation on the leeward side easy, and the low thermal conductivity of dust accumulation causes further deterioration of heat transfer

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