CN117795280A

CN117795280A - Heat exchange module

Info

Publication number: CN117795280A
Application number: CN202280055587.9A
Authority: CN
Inventors: 伊万·维克托罗维奇·内登
Original assignee: Science And Innovation Nuclear Industry Scientific Development Private Enterprise; Russian Podolysk Mechanical Engineering Plant Jsc
Current assignee: Science And Innovation Nuclear Industry Scientific Development Private Enterprise; Russian Podolysk Mechanical Engineering Plant Jsc
Priority date: 2021-12-27
Filing date: 2022-12-26
Publication date: 2024-03-29
Also published as: KR20240032872A; EP4459213A1; WO2023128805A1; ZA202400642B

Abstract

The invention is used in the field of thermoelectric engineering, in particular low-pressure and high-pressure heaters, steam superheaters and other heat exchangers, but also in other industries using heat exchange devices. The heat exchange module is in the form of a tube bundle with inlet and outlet tubes, and consists of heat exchange elements of the tube-in-tube type, comprising heating (cooling) medium blocks consisting of an inner surface of the outer tube and an outer surface of the inner tube, with an annular gap between them; a heating (cooling) medium block consisting of an outer surface of the outer pipe and an inner surface of the inner pipe; tube sheets fixing the inlet and outlet chambers of the outer tube; the bottoms of the inlet and outlet chambers of the inlet and outlet pipes are fixed. The medium enters the annular gap vertically or coaxially and exits the heat exchange tube. The number of heat exchange elements varies from 2 to 3000. The modules may be connected in 2 to 1000 segments to achieve the desired heat transfer surface. The arrangement of modules may be multi-channel.

Description

Heat exchange module

Technical field related to the invention

The invention is used in the field of thermoelectric engineering, in particular low-and high-pressure heaters, steam superheaters and other heat exchangers, and also in other industries where heat exchange devices are manufactured or used.

Information about the prior art

A known once-through vertical steam generator comprises tube-in-tube heat exchange elements fixed to a tube sheet, a branch pipe for supplying a heating medium to an inter-tube space and an inner tube from above at the same time, a branch pipe for supplying a working medium from below to an annular cavity between the inner tube and the outer tube, and a branch pipe for extracting the heating medium and steam, wherein holes formed in the tube sheet adjacent to the inter-tube space for fixing the outer tube and the inter-tube space are located between holes for fixing the inner tube and holes for supplying the heating medium to the inner tube. (patent RU 2140608,MPK F22B 1/02, F28D 7/10, release 10, 27 1999).

The disadvantage of steam generators is that

The efficiency of the heat exchange element filling sleeve is not high,

-movement of medium between the tubes, forming a stagnant zone near the tube sheet, far from the window of the space between medium inlet and outlet tubes,

Disordered flow of medium in the space between the tubes, poor access to the tubes in the vicinity of the axial region of the steam generator shell.

There is known a heat exchanger with "tube-in-tube" type heat exchange tubes, which is a heat exchange device comprising a cylindrical shell having element inlet and outlet connections, respectively, the heat exchange tubes inside the shell being mounted on a tube sheet, the shell being provided at both ends with profiled covers with connection flanges and forming cavities with the tube sheet for supplying the elements through the inlet and outlet of the heat exchange tubes, an inner tube being coaxially mounted within each heat exchange tube, an annular radial gap being formed between the tube walls, additional bottom portions being mounted at the inlet and outlet portions of the heat exchanger body, cavities forming part inlet and outlet with the tube sheet and the profiled covers, cavities forming part of the annular radial gap between the heat exchange tube walls and the inner additional tube walls being connected to cavities formed by the tube sheet and the additional bottom portions, the cavities between the profiled covers and the additional bottom portions being connected to the cavities of the inner additional tubes and the body cavities. (patent RU 2621194,MPK F28D 7/10 (2006.01), published on 1/6/2017.

The main disadvantage of this design is the high metal consumption, the inability to manufacture with high working medium pressure parameters, and the inability to repair the external heat exchange tubes.

Essence of the invention

The present invention aims to solve the problem of reducing the mass and size characteristics of the device.

The technical result of the invention is a reduction in the quality and dimensional parameters of the heat exchanger.

The method for solving the technical problems is that in a heat exchange module consisting of a single-wall heat exchange element and a tube-in-tube heat exchange element, the heat exchange module comprises a heating (cooling) medium block consisting of an inner surface of an outer tube and an outer surface of an inner tube, and an annular gap is arranged between the heating (cooling) medium block and the heating medium block; a heating (cooling) medium block consisting of an outer tube surface and an inner tube surface, and a tube plate having a medium inlet and a medium outlet in an annular gap therebetween. The supply and discharge of the medium in the annular gap can be either perpendicular to the heat exchange tubes or coaxial with the heat exchange tubes, the number of heat exchange elements being n, where n is an integer between 2 and 3000, the modules being connectable in segments between 2 and 1000 to obtain the desired heat exchange surface, the arrangement of the modules being multi-channel, centrally located heat exchange elements, 0 to 1/3 of the single-wall heat exchange elements, where the single-wall heat exchange elements and the tube-in-tube heat exchange elements satisfy a ratio of 0,1 d.ltoreq.d.ltoreq.d,

wherein D is the outer diameter of the tube-in-tube heat exchanger element,

d is the outer diameter of the single wall heat exchange element tube.

The arrangement of the module is more compact in that there is no inlet/outlet for heating medium on the cylindrical surface of the inlet/outlet chamber, and the connection of the module to the inlet/outlet manifold for heating medium is simpler (connection takes place in the heat exchanger body below/above the inlet/outlet chamber surface without increasing the diameter of the heat exchanger body) when the medium is supplied and discharged coaxially to the annular gap.

By vertically supplying and discharging the medium to the annular gap, the versatility of the heat exchange element and its uniform distribution in the heat exchange module is achieved.

By means of the combined medium inlet and outlet in the annular gap, compensation of the heat exchange surface can be achieved.

0. At the central part, up to 1/3 of the heat exchange elements are located, single-walled, allowing for the provision of a medium in the annular gap without losing useful surface of the tube sheet, while also allowing for a weight saving of the tubes.

The ratio of D < D > is 0.1 and D, the hydraulic resistance of the heat exchange element with the annular gap can be equal, and the weight of the pipeline can be reduced.

Since the module has no external housing, the heat exchange surface can be made up of a large number of modules, the heat exchanger can be multi-channel by the arrangement of the modules, and failure of any one of the tubes in the module will not result in replacement of the entire heat exchanger, but will only result in replacement or disconnection of the module.

Charts, drawings and other bill of materials

The invention is explained by the figures.

FIG. 1 shows a general view of a module;

fig. 2 shows a variant of its design;

FIG. 3 shows the supply of medium to the annular gap perpendicular to the heat exchange tubes;

figure 4 shows the supply of medium to the annular gap coaxial with the heat exchange tube.

The heat exchange module comprises an inlet chamber 1 (comprising heating medium supply tubes 8), a bottom 4, a tube sheet 5, heating and heating medium blocks 2 (comprising outer tubes 6 and inner tubes 7), an outlet chamber 3 (comprising heating medium outlet tubes 10). The access chamber may comprise a housing 9.

Information confirming possibility of implementing the present invention

The heat exchanger module operates as follows.

The flow of medium enters the inlet chamber 1 through the blind rivet 8 and then into the annular gap between the ducts 6, 7 (fig. 3, 4), where it is heated by cooling the heating medium in the duct 11 single-wall heat exchange element (fig. 4). The heated medium enters the outlet chamber 3 and is discharged from the heat exchanger module through a branch pipe 10 (fig. 1, 2). The flow of heating medium enters the space between the tube 6 (fig. 3) and the tubes 6, 11 (fig. 4) and into the inner space of the tube 7, achieving a double-sided heating of the heating medium.

The use of the module will greatly reduce the thickness of the tube sheet and tube bottom due to the smaller diameter of the tube sheet and tube bottom (for the same pressure and similar geometry, the larger surface area elements will have a larger thickness to maintain strength).

Thus, the mass and size characteristics are reduced by a factor of 1.9-2 compared to the prototype.

At the same time, the design of the heat exchanger module can be operated over a larger range of operating parameters throughout the life cycle of the technical object. The fault module only needs to be replaced by a new module.

Claims

1. The heat exchange module comprising single-wall heat exchange element and tubular heat exchange element inside pipe includes one heating (cooling) medium block comprising outer pipe and inner pipe with annular interval; a heating (cooling) medium block consisting of an outer tube surface and an inner tube surface, and a tube plate having a medium inlet and a medium outlet in an annular gap therebetween. The supply and discharge of the medium in the annular gap can be either perpendicular to the heat exchange tubes or coaxial with the heat exchange tubes, the number of heat exchange elements being n, where n is an integer between 2 and 3000, the modules being connectable in segments between 2 and 1000 to obtain the desired heat exchange surface, the arrangement of the modules being multi-channel.

2. A module according to claim 1, characterized in that 0 to 1/3 of the heat exchange elements arranged in the central part are single-walled elements.

3. The module of claim 1 wherein the single wall heat exchange element and the tube-in-tube heat exchange element satisfy a ratio of:

0,1 D ≤ d ≤D,

wherein D is the outer diameter of the tube-in-tube heat exchanger element,

d is the outer diameter of the single wall heat exchange element tube.