Plate-fin type heat exchanger with fluid being flowing back and forth in channel

Abstract

The invention relates to a plate-fin type heat exchanger with fluid being flowing back and forth in a channel. Cold channels and hot channels inside the plate-fin type heat exchanger are arranged in a layered and crossed manner and are separated by channel clapboards, and heat transfer fins are arranged in the channels; one or more horizontal adjusting battens which are horizontally arranged are arranged in each channel of the heat exchanger to separate the channel into a plurality of horizontal flow passes in the height direction; the horizontal flow passes are connected in series end to end by vertical flow passes in each channel; fluid participating in heat exchanger flows through each horizontal flow pass and each vertical flow pass in sequence to form repeated back-and-forth flow in each channel; through setting the widths of each horizontal flow pass and each vertical flow pass in each channel, the plate-fin type heat exchanger is easy to enable the fluid in each channel to keep in a reasonable range; and even if the fluid is subjected to phase change in the heat exchanger to cause that the volume and the flow rate of an inlet are very remarkably different from those of an outlet, and the reasonable flow rate distribution can be achieved by using the plate-fin type heat exchanger. The plate-fin type heat exchanger has the advantages of easily realizing flow rate regulation and distribution of the fluid, improving the efficiency of the heat changer, saving the occupied space and remarkably lowering the manufacturing cost.

Description

technical field [0001] The invention relates to a plate-fin heat exchanger, in particular to a plate-fin heat exchanger in which a fluid in a channel turns back and flows. Background technique [0002] The plate-fin heat exchanger has the characteristics of compact structure and high heat transfer efficiency. Compared with the traditional shell-and-tube heat exchanger, its heat transfer efficiency is increased by 20-30%, and the cost can be reduced by 50%. It has been widely used in air Separation, petrochemical, aerospace and other fields. The existing plate-fin heat exchanger is mainly composed of the shell, the inner channel of the heat exchanger, the partition plate of the heat exchanger channel, the fins arranged in the direction of the main flow in each channel, the outer edge seals of each channel, and the welded joints at both ends of the heat exchanger. The head cavity, the inlet pipe and the outlet pipe on the head cavity are welded. Its internal channel is separ...

AI Technical Summary

Problems solved by technology

Compared with a single plate-fin heat exchanger, the plate-fin heat exchanger group has significant disadvantages in application: the average heat transfer efficiency is low, the production cost is significantly increased, the space is large, the manufacturing process is complicated and difficult, and the service life is longer. Shorter and more prone to failure (more welded joints and connecting pipes)

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