A shell-and-tube heat exchanger

Abstract

The invention provides a shell and tube heat exchanger. A U-shaped heat exchange tube system arranged in n layers from the inside to the outside is arranged in the heat exchanger, the layers of the U-shaped heat exchange tubes are arranged in parallel, and two ends are fixedly connected with a tube system end tube plate. An anti-collision limit unit is arranged between the layers of the U-shaped heat exchange tubes respectively and comprises two location plates and n+1 separation rods. The two location plates are arranged on the two sides of the U-shaped heat exchange tube system, and the ends are fixedly connected with the tube system end tube plate. Installation grooves of the separation rods are formed in the corresponding positions in the two location plates which are detachably connected with the separation rods, and the separation rods are arranged before and after each layer of the U-shaped heat exchange tubes to separate the adjacent U-shaped heat exchange tubes. The shell and tube heat exchanger has the advantages that good flow field characteristics are provided, and vortexes are reduced; limit is performed effectively, and scratching of the tube walls is prevented; the requirement for assembly size is not high, and the practicality is high; the limit is flexible, cutting and tube flattening processes of tube sections are reduced, the efficiency is improved, the cost is reduced, and the cost performance is high.

Description

technical field

[0001] The invention relates to a shell-and-tube heat exchanger, in particular to an improvement to the internal structure of the shell-and-tube heat exchanger of a large-scale low-pressure heater in a power station using a U-shaped heat exchange piping system. Background technique

[0002] At present, the anti-collision limiting device of the U-shaped heat exchange tube of the low-pressure heater tube system designed and manufactured by domestic low-pressure heater manufacturers generally adopts a half-hole sheet lap joint fixed structure. Such as figure 1 As shown, that is, the half-hole sheet 2 made of thin steel strips is overlapped between each layer of U-shaped heat exchange tubes 1, that is, there are several half-hole grooves on both sides of the half-hole sheet 2 for the first The first layer of U-shaped heat exchange tubes 1-1 and the second layer of U-shaped heat exchange tubes 1-2 are installed, and both ends are fixedly installed in the shell-an...

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