Discontinuous multi-strand spiral flow baffle plate shell-and-tube heat exchanger

Abstract

The invention discloses a discontinuous multi-strand spiral flow baffle plate shell-and-tube heat exchanger, which comprises a tube bundle, a tube shell and a tube box, wherein the tube bundle comprises heat exchange tubes, spiral flow baffle plates, distance tubes and tube plates; the heat exchange tubes pass through the spiral flow baffle plates in a row, and the two ends of the heat exchange tubes pass through tube holes of the tube plates and are connected with the tube plates; and the spiral flow baffle plates comprise two or more than two fan-shaped baffle plate groups, and the fan-shaped baffle plate groups are discontinuously distributed or partially discontinuously distributed and partially continuously distributed in the axis direction of the tube bundle. Compared with the prior art, the heat exchanger has the advantages that: technical prejudice is overcome; multiple discontinuously distributed fan-shaped baffle plate groups form multi-group discontinuous multi-strand spiral flow to realize reinforced heat transfer of the heat exchange tubes; the heat exchanger has the characteristics of low fluid resistance, high film heat transfer coefficient and good heat exchange efficiency; and the assembly quality of the tube bundle can be improved, the energy is saved, and meanwhile, the spiral flow baffle plate tube bundle with large shell diameter can be adopted.

Description

technical field [0001] The present invention relates to shell and tube heat exchanger technology in equipment engineering, in particular to a discontinuous multi-strand spiral flow baffle specially used for heat exchange in petrochemical industry, coal chemical industry, chemical fertilizer industry, air conditioning and refrigeration, and electric power facilities Shell and tube heat exchanger. Background technique [0002] In the prior art, the shell-and-tube heat exchanger is the most widely used heat exchanger. The shell-and-tube heat exchanger is also called the shell-and-tube heat exchanger or the shell-and-tube condenser, which is widely used in chemical industry, petroleum Convective heat transfer of "liquid-liquid", "steam-steam", "steam-liquid" heat exchange in the fields of medicine, food, light industry, metallurgy, coking, etc., as well as steam condensation and liquid evaporation heat transfer Wait for the heat exchange and condensation process. [0003] The ...

AI Technical Summary

Problems solved by technology

[0006] (1) Due to the tortuous flow of the shell-side fluid between the baffles and the change of the flow direction many times, it is easier to generate fluid separation at the edge of the baffles, thus increase flow resistance;

[0007](2) Due to the dead zone of flow stagnation at the intersection between the arcuate baffle and the shell, the heat transfer efficiency is reduced, and the heat transfer performance is also reduced. Easy to scale;

[0008](3) Since the fluid in the circular area of ​​the arcuate baffle flows parallel to the axis of the tube bundle, the heat transfer performance decreases;

[0010](5) When the inlet and outlet pipes on the shell side are far away from the tube sheet, since the flow stagnation dead zone will become larger, it is necessary to add an external accessory guide tube, At the same time, it is necessary to increase the effective length of the heat exchange tube;

[0011](6) Due to the two fatal shortcomings of vibration failure and large pressure drop, the development of large-scale cold and heat exchange equipment with bow-shaped baffles is difficult to overcome obstacles;

[0022]However, measures such as adding baffles and coupling blocks cannot significantly improve the heat transfer performance of the shell-and-tube heat exchanger, but instead make the resistance pressure drop along the shell side sharp rise

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