Heat exchanger

 

(57) Abstract:

Usage: in heat technology, particularly in regenerative heat exchangers. The inventive in each tube 2 heat exchanger is located in box 3 with a diameter of about 40 to 60% of the internal diameter of a tube made of flexible material, for example polyethylene. This insert can have a cylindrical shape, and its surface may not be smooth. 3 C. p. F.-ly, 3 ill.

The invention relates to heat engineering, in particular with regenerative heat-exchange apparatus.

Known heat exchanger, comprising a housing with connections for supplying and discharging the coolant, and a bundle of tubes inside the heat transfer tubes inserts whose primary purpose is to turbulence in near-wall layer by creating there pressure gradients and velocities and education, preferably fine vortices [1]

However, the rise hydraulic resistance at the same time, as a rule, significantly outpacing growth in the heat-transfer coefficient, because in this way are not only small but also large-scale vortical structures.

In addition to the above disadvantages, a method placements NR is not possible to implement in the majority of cases used in industry and transport of heat exchangers, when the inner tube diameter is about 10 mm or less, the length of the tubes is up to several meters, and their number in the hundreds and even thousands of marine coolers or condensers tubes have an internal diameter of 7.4 mm, a length of about 2 m, and their number amounts to 2-2,5 thousand).

Known heat exchanger, comprising a housing with connections for supplying and discharging the coolant, and a bundle of tubes inside them flexible [2] is selected as a prototype.

However, this technical solution does not specify the optimal size of the insert that is not possible in some cases to achieve the desired result. In addition, the execution of inserts according to the decision, selected as a prototype, does not consider changes in thermophysical properties of the medium during movement of the latter inside the pipes, for example, by condensation of the steam, which also reduces the positive effect from the use of flexible inserts.

The purpose of the invention improve thermal efficiency of the apparatus with a minimum increase in hydraulic resistance and a decrease in the rate of deposition.

This objective is achieved in that the inside of the flexible tubing inserts have Maxim, within the area of supply of the heat carrier. The surface of the insert may be made rough and may have a capillary-porous structure.

Inserts with a maximum cross-sectional dimension, comprising 0,4-0,6 internal diameter of the pipe, allows to exclude the passage of the medium that part of the (Central) tube, which effectively does not participate in the heat exchange.

The insert in the form of a cone with the vertex located in the area of supply of the heat carrier can improve the process of heat transfer during condensation of steam inside the tubes during condensation of steam inside the tubes its speed as it moves along the tube decreases and therefore decreases the heat transfer coefficient. The increase in the diameter of the cross section of the insertion is proportional to the volume of the condensing steam will provide the ability to maintain an approximately constant speed of the pair, and hence the heat transfer coefficient along the length of the tube.

Performing surface insert rough will improve the efficiency of cleaning the surface of the tube from the sediment, as in the flexible insert is twisted, periodically touch the surface of the tube.

Execute pkac in this case, when the contacts of winding the flexible insertion tube surface, on which the vapor condenses, the condensate part will move the insert surface and transported to the exit of the tube, which will reduce the thickness of the layer of condensate on the surface of the tube and hence will increase the intensity of the heat exchange process. The most effective is the use of such inserts in cases of steam condensation inside vertical tubes with the movement of the pair of them down.

The result is energetically feasible increase thermal efficiency, when the increase in hydraulic resistance approximately equal to the increase in heat transfer coefficient and also reduces the maintenance efforts of the heat exchanger by reducing the rate of formation of deposits on the walls of the tubes and, therefore, more rarely conducted cleanup.

In Fig.1 shows a heat exchanger, longitudinal section, showing the casing 1, tube 2, a flexible insert 3, part 4 in which the flexible insert is fixed, the nozzles 5 and 6, the inlet and the nozzles 7 and 8 removal of media.

In Fig.2 depicts the flexible insert of Fig.3 node I in Fig.2.

The heat exchanger works as follows.

First, for example, hot, dry environment through Petropavlovka, through the pipe 7 is removed from the heat exchanger. Second, the cold medium is delivered into the body 1 of the heat exchanger through pipe 6 and, after passing into the annular space, is removed from the apparatus through the pipe 8.

The use of the proposed heat exchanger will allow energetically expedient improvement of thermal efficiency of the apparatus while reducing the complexity of its service.

1. Heat EXCHANGER, comprising a housing with connections for supplying and discharging fluid and the tube bundle located within them flexible, characterized in that the maximum transverse size of the inserts is 0.4

0,6 internal diameter of pipes.

2. The apparatus according to p. 1, characterized in that the insert has the shape of a cone with the vertex located in the area of supply of the heat carrier.

3. The apparatus according to p. 1, wherein the insert is made rough.

4. The apparatus according to p. 1, characterized in that the surface of the insert has a capillary-porous structure.

 

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