SU817470A1 - Heat exchanging assembly - Google Patents

Description

(54) HEAT EXCHANGER BLOCK

one

The invention relates to structural elements of heat exchangers used primarily in the refining, petrochemical and gas industries.

Heat exchangers are known that contain heat exchange units consisting of a set of tubes that are concentrically installed one inside the other, which, according to the end of the block, are extended by smooth sections one relative to the Other and mounted in a housing by means of tube grids, in each of which the ends of the tubes are fixed, having the same dimensions in the blocks, connected to the collectors, while the collectors of the same medium are formed at the ends of the heat exchanger with a housing and extreme grids, one of which is communicated with the interblock space by an opening in the sieves 11 e.

The lack of a heat exchanger lies in the small heat transfer surface of the tubes of the blocks, since the walls of the tubes are smooth.

This disadvantage is eliminated in the heat exchange element containing installed in one another pipes, which are provided with corrugations located along a helical line 12.

However, the corrugations separated by a cylindrical partition mounted coaxially to the pipes provide only a spiral movement of the coolant through the spiral channels, therefore these elements cannot be used in multi-block heat exchangers,

in which the intensification of heat exchange is ensured by the turbulization of the flow of heat-transfer fluid.

Also known is a heat exchange unit containing coaxial tubes having different lengths, the ends of which are fixed, in individual tube sheets, distributing, collecting, supplying and discharging collectors. 3.

A disadvantage of such a heat exchanger is the inefficient heat exchange process.

The purpose of the invention is to intensify heat transfer and improve reliability.

This goal is achieved by the fact that the walls of each of the pipes are corrugated, with the corrugations arranged in a helical line with a cross. directed by the 1st of each subsequent pipe with respect to the previous

Bottom and tube sheets of each pair of adjacent pipes, starting from the inside, are connected to form insulated distribution chambers connected to one another by overflow pipes of different diameters and connected to the collecting manifolds; as well as the fact that the distribution chambers are located inside the inlet and outlet manifolds. In addition, the heat exchange unit is equipped with an outer casing with inlet and outlet nozzles,

FIG. 1 shows the proposed heat exchange unit; FIG. 2 blocks installed in the casing; in fig. 3 - coaxial tubes of the heat exchange unit, provided with corrugations in opposite directions.

The heat exchanger block contains coaxial tubes 1-4, fitted with mountains, tube grids 5-11, overflow pipes 15-18, insulated chambers 19-22, distributing 23, collecting 24, supplying 25 and discharging 26 collectors, connecting pipes 27 and 28 for media supply, nozzles 29 and 30 for their removal. Inside pipe 1 is placed pipe 31, which is also provided with corrugations, but plugged at the ends. The heat exchange unit is installed in the housing 32, which is provided with a nozzle 33 for supplying the medium, a nozzle 34 for withdrawing the medium and transverse partitions 35.

The device works as follows.

The heating (cooled) coolant flows through the pipe 27, the collector 23 and the overflow pipes 15 and 16 into the chambers 19 and 20 and the annular gaps between the pipes 1 and 2, 3 and 4, i.e. distributed simultaneously in annular channels with alternation through one channel. Passing the canals, the coolant enters chambers 21 and 22, the collector 24 and cooled off through pipes 29 from the unit.

Heated (cooling) coolant flows in countercurrent c. annular channels between pipes 2 and 1 and 31 through the pipe.28 and the collector 25.

Passing the channels, the coolant is removed when heated through the collector 26

and pipe 30 from the block. The blocks can be installed in a common case 32. In this case, an additional cooling medium can be supplied through the nozzle 33, which is removed through the nozzle 34 through the nozzle 33. The heat transfer medium may not be supplied inside the case. In this case, the space inside the casing is heat insulating, in particular, the outer walls of the tubes of the 4 blocks are heat insulated.

The use of the proposed unit allows to intensify the process of heat exchange, to unify the heat exchangers and to facilitate installation and dismantling.

Claims (3)

1. Heat exchanger block containing coaxial tubes of various length, the ends of which are fixed in individual tube sheets, distributing, collecting, supplying and drainage collectors, characterized in that, in order to intensify heat exchange and increase reliability, the walls of each of the pipes are corrugated, and the corrugations are arranged in a helical line with alternating directions for each subsequent pipe in relation to the previous one and the pipe grids of each pair of adjacent pipes, starting from the inside, they are connected with the formation of insulated distribution chambers connected to one another by overflow pipes of different diameters and connected to the distributing and collecting collectors. 2. Block 1, distinguished by the fact that the distribution chambers are located inside the inlet and outlet collectors. 3. The unit according to PP.1,2, which is equipped with an outer casing with inlet and outlet pipes. Sources of information taken into account in the examination 1. USSR author's certificate number 486958, cl. F 28 O 7/10, 1979. 2. The patent of the USA 3777343, cl. 29.157.3, publ. 1973. 3. USSR author's certificate number 186906, cl. F 28 O 7/10, 1963. 29 24 17 25 22 Р7 (Put.J