Shell-and-tube heat exchanger

 

(57) Abstract:

The invention relates to heat engineering and can be used in hot water systems and heating. The invention includes a housing with a nozzle inlet edition heat-exchange media, in which by means of base partitions placed the bundle of profiled tubes, at least part of which has an outer surface made from trapezoidal in longitudinal cross-section of ribs arranged along a helical line, and the internal cavities formed under the ribs, which are located along the length of the tube in increments constituting 7,0-12,0 height of the ribs, and have a height of 0.04 to 0.08 outer diameter of the tube, thus, edges, at least part of the length of the tubes have in its longitudinal cross-section of a trapezoid shape, in case of equal values of the projections of the lateral side of the larger base of the trapezoid and the edges on at least part of the length of the tubes have in its longitudinal section of the form l trapezoid, the height of one of the lateral sides of which exceeds the height of the other side in not more than 0.02 of the outer diameter of the tube, and hollows formed by interconnected portions of the inner surface, as outlined in the longitudinal secondly curvature on both sides of the inner surface of the tube. The invention allows to significantly extend the scope heat exchangers and provides high reliability, durability and efficiency of the heat exchanger, as well as to reduce the hydraulic resistance and intensify the heat transfer. 4 C.p. f-crystals, 2 Il.

The invention relates to the field of heat and can be used in hot water systems and heating.

Known shell-and-tube heat exchanger containing casing, a nozzle inlet of the first heat-exchange medium, the nozzle for release spent the first heat exchange medium, the tube bundle contained in the tube support boards with the message headers for intake-release another heat exchange medium, the first medium is mainly steam and other heat exchange medium is predominantly liquid, the nozzle inlet of the first heat-exchange medium is installed coaxially inside of the socket to release the spent heat transfer medium, which is placed at the bottom of the casing and is connected to the condensate tank (patent RU 2166716, CL F 28 D 7/00, publ. 10.05.2001).

The closest known is the water water or steam-water heat exchanger having a casing in which reparability in longitudinal section, ledges, located along a helical line, and the inner with depressions formed under ledges, which can be performed with a step of constituting 0,3-1,5 outer diameter of the tube, and having a height of 0.1-0.2 outer diameter of the tube (see EN 6434 U1, F 28 D 7/16, publ. 1998).

Known heat exchanger, also developed by JSC "Promenergo", allows you to use it in the water water and steam-water shell and tube heat exchangers in almost optimal conditions of heat transfer for both cases.

However, when finalizing the design of the heat exchanger had failed to solve the technical problem is to optimize determined by the configuration of the inner and outer surfaces of the tubes of the heat exchange parameters for both environments, while ensuring the manufacturability of a design that has also made it possible to significantly expand the scope of its application, while ensuring high manufacturability, reliability, durability and efficiency.

This is achieved by the fact that the heat exchanger includes a casing with pipe intake-release of heat exchange media, in which by means of base partitions placed the bundle of profiled tubes, at least some of which has come the second line, and internal - with depressions formed under the ribs, which are located along the length of the tube in increments constituting 7,0-12,0 height of the ribs, and have a height of 0.04 to 0.08 outer diameter of the tube, thus, edges, at least part of the length of the tubes have in its longitudinal cross-section of a trapezoid shape, with equal values of the projections of the lateral side of the larger base of the trapezoid. Thus, edges, at least part of the length of the tube can have in its longitudinal section of the form l trapezoid, the height of one of the lateral sides of which exceeds the height of the other side in not more than 0.02 of the outer diameter of the tube. Depression is formed by interconnected portions of the inner surface, outlined in longitudinal section of a tube, preferably equal radii, components 0,0094-0,0156 outer diameter of the tube and having centers of curvature on both sides of the inner surface of the tube or cavity may be formed by portions of the inner surface, outlined in longitudinal section of a tube, preferably equal radii, components 0,0094-0,0156 outer diameter of the tube and having the centers of curvature spaced from the outer surface of the tube, preferably, Sime altnoy from the longitudinal axis of the tube. The width of the ribs is greater base of trapezium is 0,0984-0,1641 outer diameter of the tube, and the width of the ribs at the lower base of the trapezoid - 0,0563-0,0938 outer diameter of the tube and the inner tube diameter of 0.65 to 0.75 of its outer diameter.

These design parameters was tested on the experimental samples used in both cold and hot water supply and heating systems, and showed high technical results.

The invention is illustrated by drawings, where Fig. 1 shows a General view of the heat exchanger in the context of Fig.2 schematically shows a longitudinal section of the profiled tube.

Shell-and-tube heat exchanger includes a casing with pipe intake-release of heat exchange media, in which by means of base partitions placed profiled beam tubes having an outer surface with trapezoidal in longitudinal cross-section of ribs arranged along a helical line, and the inner with depressions formed under the ribs, which are located along the length of the tube in increments constituting 7,0-12,0 height of the ribs, and have a height of 0.04 to 0.08 outer diameter of the tube, thus, edges, at least part of the length of the tube are prodali. Thus, edges, at least part of the length of the tube can have in its longitudinal section of the form l trapezoid, the height of one of the lateral sides of which exceeds the height of the other side in not more than 0.02 of the outer diameter of the tube. Depression is formed by interconnected portions of the inner surface, outlined in longitudinal section of a tube, preferably equal radii, components 0,0094-0,0156 outer diameter of the tube and having centers of curvature on both sides of the inner surface of the tube or cavity may be formed by portions of the inner surface, outlined in longitudinal section of a tube, preferably equal radii, components 0,0094-0,0156 outer diameter of the tube and having the centers of curvature spaced from the outer surface of the tube, preferably symmetrically relative to the plane of the cross-section passing through point surface depressions, most remote from the longitudinal axis of the tube. The width of the ribs is greater base of trapezium is 0,0984-0,1641 outer diameter of the tube, and the width of the ribs at the lower base of the trapezoid - 0,0563-0,0938 outer diameter of the tube, with the inner diameter of the tube equal to 0.6 water / water or steam-water heat exchangers, made with an outer surface having a trapezoidal longitudinal cross-section of the ribs 2, located along a helical line. The inner surface of the tube is made with cavities 3 formed under the ribs 2. Ribs 2, at least part of the length of the tubes have in its longitudinal section of the form l trapezoid or similar, the height of one of the side walls 4 which exceeds the height of the other side 5 not more than 0,02 diameter "D" of the tube, with equal values of the projections of these parties on a larger base of the trapezoid. In the manufacturing process ensures high precision, alignment holes, which allows to increase the number of partitions mounted on the unit length of the tubes, which in turn leads to higher thermal efficiency of the device as a whole, to increase the heat capacity due to additional turbulence in the flow. Arising during operation of the tube vibration does not lead to destruction due to chafing at the site of contact with the walls. Significantly reduced weight of the device as a whole and increased durability. When the heat exchanger described above, the tube or tubes is heat exchange between the medium flowing inside the tube, and the environment, what s on its walls due to the trajectory of the stream. The shape, arrangement of the ribs 2 on the surface of the tube, provide optimal conditions and parameters of heat transfer, which is confirmed experimentally in the test samples. The achieved results allow to recommend this tube for a wide application in various fields where it is necessary to provide effective heat transfer in a long operational life and overhaul period.

1. Shell-and-tube heat exchanger containing casing with pipe intake-release of heat exchange media, in which by means of base partitions placed the bundle of profiled tubes, at least part of which has an outer surface made from trapezoidal in longitudinal cross-section of ribs arranged along a helical line, and the inner with depressions formed under the ribs, which are located along the length of the tube in increments constituting 7,0-12,0 height of the ribs, and have a height of 0.04 to 0.08 outer diameter of the tube, thus, edges, at least on part of the length of the tubes have in its longitudinal cross-section of a trapezoid shape, with equal values of the projections of the lateral side of the larger base of the trapezoid.

2. Shell-and-tube heat exchanger under item 1, in which the edges, at least part of the ow exceeds the height of the other side no more than 0.02 of the outer diameter of the tube.

3. Shell-and-tube heat exchanger under item 1 or 2, in which the depression is formed by interconnected portions of the inner surface, outlined in longitudinal section of a tube, preferably equal radii, components 0,0094-0,0156 outer diameter of the tube and having centers of curvature on both sides of the inner surface of the tube.

4. Shell-and-tube heat exchanger according to any one of p. 1-3, in which the depression is formed by portions of the inner surface, outlined in longitudinal section of a tube, preferably equal radii, components 0,0094-0,0156 outer diameter of the tube and having the centers of curvature spaced from the outer surface of the tube, preferably symmetrically relative to the plane of the cross-section passing through a point of a surface depression, the most remote from the longitudinal axis of the tube.

5. Shell-and-tube heat exchanger according to any one of paragraphs. 1-4, in which the width of the ribs is greater base of trapezium is 0,0984-0,1641 outer diameter of the tube, and the width of the ribs at the lower base of the trapezoid - 0,0563-0,0938 outer diameter of the tube, with the inner diameter of the tube is equal to 0,65-0,75 its outer diameter

 

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