Case-type multi-shell-pass countercurrent speedup type shell and tube heat exchanger

Abstract

The invention provides a case-type multi-shell-pass countercurrent speedup type shell and tube heat exchanger. The heat exchanger comprises a shell (5), wherein one end of the shell is provided with a tube plate I (3); a tube case (2) is connected outside the tube plate I (3), and a baffle is arranged inside the tube case; the other end of the shell is provided with an end cover (11); a heat exchange tube (6) is arranged in the shell; the shell of the heat exchanger has a round-upside square-downside structure or a square-upside round downside structure; at least one layer of vertical countercurrent speedup guide plate (7) is arranged in the shell; and the inner part of the shell is separated into at least two shell passes to ensure that the number of pass of fluid outside a tube is the same as that of fluid in the tube, and the fluid outside the tube and the fluid in the tube have opposite flowing dictions along the axial direction. The heat exchanger can make the direction of the fluid along the axial direction in the shell pass in the shell and tube heat exchanger opposite to that of the fluid in the tube, make the fluids quickly flow for heat exchange, reduce heat transfer temperature difference of the fluids, improve heat exchange efficiency, and realize synchronous composite utilization of double heat sources. The special shell structure ensures more compactness in heat exchange tube arrangement, can effectively reduce the volume of the heat exchanger, and reduces the filling amount of a refrigerant.

Description

technical field [0001] The invention relates to the field of processing and manufacturing of heat exchangers, in particular to a shell-and-tube heat exchanger with multi-shell side countercurrent speed-up. Background technique [0002] Shell and tube heat exchangers are widely used in chemical industry, food, refrigeration and air conditioning and other fields. Many parallel tubes are arranged in a cylindrical shell to allow two fluids to flow through the space inside the tube and the space outside the tube and exchange heat. . For the single shell-side shell-and-tube heat exchangers widely used at present, when the heat transfer capacity of the heat exchanger is large, the diameter of the shell and the cross-section of the single-shell side are large, resulting in a low velocity of the shell-side fluid, resulting in heat transfer. The overall heat transfer coefficient of the device is not high, and the heat transfer efficiency is low. Contents of the invention [0003] ...

AI Technical Summary

Problems solved by technology

For the single-shell-side shell-and-tube heat exchangers that are widely used at present, when the heat transfer capacity of the heat exchanger is large, the diameter of the shell is large and the flow cross-section of the single-shell side is large, resulting in a low velocity of the shell-side fluid, resulting in heat transfer. The overall heat transfer coefficient of the device is not high, and the heat transfer efficiency is low

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