SU840662A1 - Shell-and-tube heat exchanger - Google Patents

Description

(54) KOKUKOTRUBNY HEAT EXCHANGER

one

The invention relates to shell-and-tube heat exchangers for use in, for example, the chemical industry.

Shell-and-tube heat exchangers are known that contain helically twisted pipes of an oval profile, mounted with adjacent pipes touching the maximum size of an oval having a width equal to the diameter of the straight ends of the pipes l.

However, such a heat exchanger is characterized by a relatively narrow range of tubing pitch steps, at which optimum heat transfer intensification is ensured, and a more sophisticated pipe manufacturing technology.

The purpose of the invention is the intensification of heat exchange in the case of a transverse flow of a beam by a coolant and moderate pressure losses.

This is achieved by the fact that the pipes in each transverse row of the beam are installed with gaps, which form slit channels with a maximum width equal to half the difference between the maximum and minimum dimensions of the oval, and have only contact with the pipes of adjacent rows.

In addition, the perimeter of the oval profile of the pipe is equal to the perimeter of its circular ends.

FIG. 1 schematically shows the proposed heat exchanger; FIG. 2, section A-A in FIG. 1, in FIG. 3 shows a single heat exchanger tube; FIG. 4B-B in FIG. 3

The shell-and-tube heat exchanger contains spiral-twisted heat-exchange tubes 1 of the oval profile installed in each transverse row of the heat exchanger with a gap, forming slit channels 2 along the beam length with a maximum width equal to half the difference between the maximum and minimum dimensions of the oval and having only contacts with the tubes neighboring rows

The pipes 1 are fastened with straight round ends, the perimeter of which is equal to the perimeter of the oval profile of the pipe, in tube plates 3.

The heat exchanger is equipped with collectors 4 and 5 for the supply and removal of heat exchanging media.

Claims (2)

During the circulation of heat-exchange media through pipes 1 and in the annular | The space is spirally twisted media. When installing pipes In the heat exchanger, with the formation of slit channels 2 between them along the entire length of the pipes and selecting the ratio of the twist pitch of the pipes to the maximum size d of the profile equal to 6-15, the heat exchanger is observed to optimize heat exchange with the cross flow around the pipes. The implementation of pipes with a constant per dimeter perimeter provides / forgiveness of the technology for the manufacture of pipes and improves heat exchange conditions during the flow inside the pipes. Claim 1. Shell-and-tube heat exchanger containing a bundle of spiral-wrapped oval profile tubes installed with the adjacent tubes touching the maximum oval size and fixed with straight round ends in tube plates with the purpose of intensifying heat transfer during a transverse flow of a beam by a heat carrier and moderate pressure losses, the pipes in each transverse row of the beam are installed with a gap of slot-like channels forming the length of the beam with a maximum width equal to The differences between the maximum and minimum HfciM are the dimensions of the oval, and have contact only with the pipes of adjacent rows. 2. A heat exchanger according to claim 1, characterized in that the perimeter of the oval profile of the pipe is equal to the perimeter of its ends of circular cross section. Sources of information taken into account during the examination 1. USSR author's certificate No. 2519683, cl. F 28 D 7/00, 1977.