Heat exchanger

FIELD: power engineering.

SUBSTANCE: heat exchanger comprises a vessel with the first and second channels for coolants and spherical heat transfer elements placed in spherical holes. Channels are separated with a heat transfer surface, inlet and outlet nozzles of the first channel, inlet and outlet nozzles of the second channel. Spherical heat transfer elements are placed in spherical holes on the heat transfer surface and on the inner surface of the vessel.

EFFECT: invention makes it possible to improve heat transfer from a heat transfer surface that separates channels of a heat exchanger.

2 dwg

 

The invention relates to heat-exchange technique and is intended for use as a heat exchanger nuclear power plants operating on liquid and gaseous fluids in the modes of variable loads and a significant differential pressure in the cavities of the heat exchanger.

Known heat exchangers (RF Patent 2378594, heat Exchanger, MKI F28D 7/00, publ. 10.01.2010). A heat exchanger comprising a housing with an interior of the bundle of heat exchange tubes, fixed in the tube plate, and a package of parallel corrugated plates in the annular volume.

A disadvantage of the known device is a significant increase in the hydraulic resistance of one of the channels of the heat exchanger, in which to increase the heat transfer in the flow of the coolant introduced energizers. At the same time in another channel of the heat exchanger such energizers do not enter, which creates asymmetry of channels on thermal and hydraulic characteristics of the heat exchanger. This situation does not allow to optimize the heat transfer in channels especially in the case of rosnafisah States of coolant, such as liquid - gas. In addition, the operational characteristics of the known heat exchangers restrictions associated with strength requirements that do not allow significant difference on the areas in the cells.

The closest in technical essence is the heat exchanger (patent RU №2224198, MKI F28D 7/04, publ. 20.02.2004), comprising a housing with first and second channels for fluids separated by a heat transfer surface, the inlet and outlet of the first channel, the inlet and outlet of the second channel, the heat transfer surfaces within the channels installed helical turbulence promoters.

A disadvantage of the known device is that it tends to increase the heat transfer from the heat transfer surface due to turbulence in flow of fluids, the surface area of heat transfer remains unchanged. In addition, the cavity of the heat exchanger are thin-walled shell that does not allow significant pressure not only on the inner wall of the housing, which can be compensated power shell, but haloperidol surface that occurs when the differential pressure flow of fluids in the chambers of the heat exchanger.

The technical result of the invention is to improve heat transfer from separating the channels of the heat exchanger heat transfer surface by simultaneous increase of heat transfer surface and create the conditions for mixing the flows of the fluids within the channels, as well as increasing the strength of the shell of the heat exchanger at high rasnet the x pressures in the channels.

This result is achieved by the fact that in the known heat exchanger, comprising a housing with first and second channels for fluids separated by a heat transfer surface, inlet and outlet nozzles of the first channel input and output connections of the second channel, introduced spherical heat transfer elements placed in a spherical holes on the heat-transfer surface and the inner surface of the shell.

The invention is illustrated by drawings, where figure 1 shows a view of the heat exchanger in the plan under the transparent top cover of the heat exchanger, figure 2. depicts a fragment of the heat exchanger installed inside the channels of the spherical heat transfer elements.

The heat exchanger includes a housing 1 with the first and second channels 2, 3 for heat transfer fluids, separated heat transfer surface 4, the input and output sockets 5, 6 of the first channel 2, input and output pipes 7, 8 of the second channel 3, the spherical heat transfer elements 9, is placed in the spherical hole 10 on the heat-transfer surface 4 and on the inner surface of the housing 1.

The heat exchanger works as follows.

Two streams of fluid of different temperatures, and possibly different phase States, arrive at the input nozzles 5, 7 channels 2, 3 of the heat exchanger. Passing through the gaps between the spheres of the economic heat transfer elements 9, more hot coolant releases heat these elements, however, in which geometrical order is not housed spherical heat transfer elements 9 within the channels 2 and 3, when the flow inside the channel is split in the gaps and mixing due to the formation of vortices in the flow in curvilinear gaps along the stream and constrictions in the pipe section. Because the heat exchange between the liquid coolant and the surface heat transfer elements 9 occurs mainly in thin adjacent to the surface of the film, due to the vortex flow of these elements 9 film moves in a rear area for a spherical element 9, where its separation from the surface and mix with the rest of the thread. Thus there is efficient transfer of heat from the spherical heat transfer elements 9 to the stream or the reverse stream to elements 9. Repetition of these processes ensures the alignment of the heat transfer processes in the cross section of the chambers 2 and 3. Because of the spherical heat transfer elements 9 have good thermal contact with the heat transfer surface 4 (formed, for example, by diffusion welding of elements of the heat exchanger), due to thermal conductivity of solid materials, there is an effective transfer of heat from the spherical heat transfer elements of one Cam is ture to a spherical heat transfer elements of the other camera. It is obvious that the heat exchange surface in the proposed device is substantially greater heat exchange surface of the prototype.

Spherical heat transfer elements have thermal and mechanical contact is formed, for example, by diffusion bonding method, with the heat transfer surface and the walls of the casing 1, which creates a multipoint power structure, prevent deformation of the channels with the emergence of dynamic pressure variations in the chambers of the heat exchanger.

Thus, the introduction of spherical heat transfer elements in the channels of the heat exchanger to improve heat transfer from the separating channels of the heat transfer surface by increasing the heat exchange surface and due to the crushing and mixing of the coolant flow (turbulence) in the gaps between the spherical thermally conductive elements. In addition, the mechanical fixing of the spherical heat transfer elements on the heat transfer surface and on the walls of the casing ensures high mechanical strength of the channels of the heat exchanger.

The use of the invention in heat exchange systems that require high intensity of heat transfer in a constructive restrictions on weight and dimensions, provides improved strength characteristics at high differential pressures in the channels of the heat exchanger and Lucchini heat transfer from separating the channels of the heat exchanger heat transfer surface, by simultaneously increasing the heat exchange surface and create the conditions for mixing the flows of the fluids within the channels.

A heat exchanger comprising a housing with first and second channels for fluids separated by a heat transfer surface, inlet and outlet nozzles of the first channel input and output connections of the second channel, spherical heat transfer elements placed in the spherical hole, characterized in that the spherical heat transfer elements are located in the spherical holes on the heat-transfer surface and on the inner surface of the housing.



 

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