Novel oval twisted pipe heat exchanger with vortex generators

Abstract

The invention discloses an oval twisted pipe heat exchanger with vortex generators. The oval twisted pipe heat exchanger is mainly composed of parts of a pipe box, pipe plates, a shell, heat exchangepipes, ends and the like. Each heat exchange pipe comprises an inlet straight pipe segment, an outer finned pipe with an oval twisted pipe structure and an outlet straight pipe segment, and the interior of each heat exchange pipe is of an oval spiral twisted channel structure. Each outer finned pipe comprises an oval twisted pipe and finned plates which are provided with the corresponding vortex generators and can be closely attached to the oval twisted pipe. The finned plates of each outer finned pipe are divided into the upper finned plate and the lower finned plate, and the two finned plates of each outer finned pipe are brazed to the corresponding oval twisted pipe through the brazing process. The structures of the vortex generators on the finned plates can be triangular forms, dual blade forms and other forms. The vortex generators can generate vortex structures, high-energy fluid of main flow is entrained into a boundary layer through the vortex entrainment function, low-energy fluid in the boundary layer can be reversely pushed out of the boundary layer to enter the main flow, and energy exchange of inner fluid and outer fluid is completed; and the boundary layer is thinned,and therefore heat resistance is reduced.

Description

technical field [0001] A novel elliptical twisted tube heat exchanger with a vortex generator can be used in petroleum, chemical industry, power, nuclear energy, metallurgy, refrigeration, aerospace and other industries, and belongs to the technical field of heat exchange. Background technique [0002] In recent years, with the rapid growth of energy demand, the deep development and rapid depletion of land oil and gas resources, and the intensification of environmental pollution, countries around the world have attached great importance to the exploitation and utilization of offshore natural gas resources. The natural gas liquefaction process is one of the most critical links, and the supporting seawater-mixed refrigerant heat exchanger is a key research direction. [0003] As the key equipment in the mixed refrigerant liquefaction process, the seawater-mixed refrigerant heat exchanger is mainly used for multi-stage cooling / condensation of multi-stage compressed media (mixed...

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Problems solved by technology

[0005] A comprehensive analysis of the existing research on enhanced heat transfer tubes found that the research was mainly to change the heat transfer area of ​​traditional heat transfer tubes, increase the degree of fluid turbulence, and destroy the boundary layer of the fluid, while introducing eddy currents into the enhanced heat transfer tubes However, studies on the formation of vortex structures are rare

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