RU1802289C - Heat exchanger - Google Patents

Abstract

Usage: in marine power engineering, and more specifically in recuperative heat exchangers. The essence of the invention: increasing the manufacturability and intensification of heat transfer is ensured by the presence of a gap between the shell 6 and the tube sheet 4 and an increase of at least 1.5 times the size of the ventilation windows 10 located on the side diametrically opposite to the inlet pipe 2. During operation the heat exchanger does not form stagnant zones, and in the manufacture the operation of tight connection of the shell 6 and the tube sheet 4. 1 sludge is excluded.

Description

The invention relates to ship power engineering and can be used in recuperative heat exchangers.

The aim of the invention is to enhance heat transfer and improve manufacturability.

The drawing shows a heat exchanger of the proposed design.

The heat exchanger contains a casing 1 with nozzles for input 2 and output 3 of the heated medium, a tube sheet 4 with a bundle of pipes 5 fixed in it, enclosed in a shell 6 with an external screw fin 7. The shell has a gap 8 with a tube sheet and transfer windows 9 and 10 located along its perimeter from the side of the grating 4, and the windows 9 have a size of at least 1.5 times the size of the windows 10,

The heat exchanger operates as follows.

The medium is heated through, the inlet pipe 2 enters the annular gap formed by the casing 1 and the shell 6, swirling due to the fins 7 on the shell 6, the fluid through the gap 8 between the shell 6 and the tube 4, and also through the transfer windows 9 and 10 By eliminating the stagnant zones in the annular gap and the flow around the heat transfer pipes 5 from all sides, it is guided through the central window and a segment cut from the first baffle to the second and subsequent / annular compartments and through the pipe 3 enters the system.

The presence of a gap 8 between the shell 6 and the tube sheet 4 eliminates the sealing of their connection to each other, allows

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to mount and dismantle the shell 6 with minimal technological allowances for assembly. This increases the manufacturability of the heat exchanger. The presence from the diametrically opposite input port of the side of the overflow windows, the dimensions of which are at least 1.5 times larger than the sizes of the other windows, allows eliminating stagnant zones in the annular gap to direct the heated medium evenly into the first and second compartments of the annular space thereby transverse flow around heat-exchange pipes, which intensifies heat transfer.

Claims (1)

SUMMARY OF THE INVENTION A heat exchanger comprising a casing with nozzles for input and output of a heated medium, a tube bundle fixed in a tube sheet and enclosed in a shell having an external helical ribbing and transfer windows located along its perimeter from the side of the tube sheet, and partitions with sections in the annular space moreover, the nozzle of the input of the heated medium is placed on the opposite end of the casing of the tube sheet, and the nozzle of the output of this medium is at the end of the latter and communicated with the cavity of the shell, characterized in that, in order to intensify the heat exchange process and increasing processability, shell is fixed relative to the tube sheet with a clearance, and downcomers window disposed on the side opposite the inlet pipe, having a size of at least 1.5 times the size of other windows.