RU2364812C1 - Cylindrical plate heat exchanger - Google Patents

Abstract

FIELD: heating.

SUBSTANCE: invention relates to heat-process engineering and is to be utilised in any technology branch for reheating or cooling liquid or gaseous media. The cylindrical plate heat exchanger contains a heat exchange matrix of corrugated plates with shrink flangings and manifold flangings. Each plate is circular in shape; in its central part there are corrugations arranged as well as a throughhole for the manifold of one of the heat transfer media (for example, the greater density heat transfer medium) while in the other parts (segments) there are flanged throughholes arranged for the other heat transfer medium (that of lesser density). The corrugated plate section has additional outward flanging with each matching outward flanging weld (solder) connected and providing for leak-proof closure of the greater density heat transfer medium and the lesser density heat transfer medium ducts. The heat exchange matrix is confined in a hermetically sealed housing equipped with a sensor for control over heat transfer media leakage. Proposed are different versions of the plate central part design.

EFFECT: enhanced efficiency and reliability of the heat exchanger.

4 cl, 3 dwg

Description

The invention relates to heat engineering and can be used in any technical field for heating or cooling liquid or gaseous media.

A heat exchanger is known, consisting of a set of corrugated plates assembled into a matrix with the help of special elastic gaskets and tightened by pressure plates and studs (prospectus of the Alfa Loval company). The plate of such a heat exchanger has four holes located in the corners of a rectangular plate.

The disadvantage of such a heat exchanger is the limitation of the used coolant media (liquid-liquid) and the low level of coolant parameters (pressure up to P = 1.6 MPa and temperature up to t = 160 ° C).

Expanding the range of parameters to P = 2.5 MPa and t = 300 ° C was achieved in brazed heat exchangers (brochures from Alfa Loval and Swep), but their use is also limited by the throughput of the four plate openings, high structural rigidity, and low melting point of the solder.

A heat exchanger is known, consisting of a cylindrical body, in which a heat exchange matrix is placed, which represents a package of round-shaped plates welded together, into which a heat carrier is supplied. The second coolant is fed into the bag through a pipe welded to the body [prospectus of the company "G-MAR +" and an article in the information magazine "INDUSTRIAL BULLETIN" No. 9/2004, p. 62].

The disadvantages of such a heat exchanger are: the presence of a housing with nozzles, uneven distribution of coolant flow rates on a round plate due to different lengths of flow lines, a decrease in the degree of heat recovery due to this, and the presence of an additional special elastic corset for fixing the matrix in the housing and flow direction in matrix.

The closest solution to the proposed device and adopted as a prototype is a heat exchanger containing a housing with inlet and outlet pipes of one coolant and a package of corrugated plates pairwise connected to each other along the peripheral edges with collectors for the second coolant, and the collectors are formed by flanged windows made in the plates, fastened in pairs, while the plates are transverse stamping, forming a zigzag channels [RU, patent 2052757, CL. F28D 9/02, F28F 3/00, 1994].

The disadvantage of this heat exchanger is the presence of a housing with pipes for supplying and removing one of the coolants, which increases the dimensions and mass of the heat exchanger and complicates its manufacture. When working with heat transfer media having a large pressure drop at high temperature, the housing may be deformed due to the temperature difference, which reduces the reliability and efficiency of the heat exchanger due to leakage of the heat transfer fluid between the housing and the package. In case of loss of tightness of the housing, coolants can get into the environment, which is unacceptable with toxic substances.

The technical problem that the proposed device solves is the reduction of mass, simplification of the design, increasing the reliability and efficiency of the heat exchanger.

The technical result that provides a solution to the problem is to create a uniform velocity field and temperature field and the tightness of the structure relative to the environment.

The technical result is ensured by the fact that the cylindrical plate heat exchanger contains a heat exchange matrix of corrugated plates with flanging of the outer edges and flanging of the collectors, each plate having a circle shape, in the central part of which there are corrugations and holes of the collectors of one of the heat carrier (for example, a heat carrier of higher density), and in the remaining parts of the circle (in segments) - holes and collectors with flanging of the collectors of another coolant (lower density), corrugated ki plates have extra flanging the outer edges, the outer edges of the same name flange joined by welding (brazing) and sealed against leakage of coolant channels of higher density and lower density of the coolant channels.

The technical result is ensured by the fact that the heat exchange matrix is enclosed in a sealed enclosure equipped with a sensor for monitoring leakage of heat carriers from the heat exchange matrix.

The technical result is ensured by the fact that the holes of the collectors of the central part of the matrix are located on the axis of symmetry of the matrix, and the coolant channel of higher density has limited longitudinal flanges that direct the flow to the periphery and to the center of the plate.

The heat exchanger also differs from the prototype in that the holes of the collectors of the central part of the matrix are located in the corners of the matrix.

Figure 1 shows a longitudinal section of a cylindrical plate heat exchanger, figure 2 is a transverse section through the matrix of figure 1, figure 3 is a different layout layout matrix with options for the location of the collectors of the inlet and outlet of the coolant with cross-accurate and counter-flow patterns.

The cylindrical plate heat exchanger (figure 1) contains a heat exchange matrix 1 of corrugated plates 2 (figure 2) with flanges 3 of the outer edges 4. Each plate 2 has a circle shape, in the central part of which there are corrugations 5 and holes 6 with flanges 7 of the collectors 8 one of the coolants (for example, a coolant with a higher density), and in the remaining parts of the circle (in segments) - holes 9 with flanges 10 of the collectors 11 of another coolant (for example, a lower density). The connection of several corrugated plates 2 by means of flanges 7 of holes 6 form a collector 8. Similarly, the connection of flanges 10 of holes 9 form a collector 11.

The corrugated portion of the plate (2) has an additional outer flanging 12. Both of the same external flanging are connected by welding (soldering) and close the leakage channels 13 of a coolant with a higher density and channels 14 of a coolant with a lower density.

Holes 6 can be located in the middle (figure 2) or in the corners of the Central part (figure 3). The central part of the plate has jumpers 15 with gaps in the places of rotation of the coolant. In the diagram of Fig. 3 "a", the gaps are located alternately at each side, in the diagram of Fig. 3 "b" it is symmetrical with a gap near the axis. With scheme 3 "b", a uniform distribution of the coolant is achieved when the ratio of the diameter D to the width B of the matrix is equal to or greater than three. In this scheme, the use of chevron channels is advisable. The choice of hole patterns is determined by the required length of the heat exchange channel and the design of the stamp.

With a symmetrical arrangement of the holes relative to the longitudinal or transverse axis, one stamp is required (Fig.2 and Fig.3 "a"), with an asymmetric arrangement - two stamps (Fig.3 "b" and Fig.3 "c").

The heat transfer matrix (1) (FIG. 1) is enclosed in a sealed casing 16, and a leak monitoring sensor 17 for changing pressure in the housing serves to monitor leakage of coolants from the heat exchanger. In addition, the housing 16 is an additional power protection against external influences and from leakage of coolant from the heat exchanger.

The heat exchanger operates as follows.

The heated heat carrier, for example air, enters one of the openings 6, is distributed with the help of the collector 8 along the surface of the heat exchange matrix 1 and is sent to the channels 13, where it is heated by the heat of the second heat carrier, for example gas. The second coolant is fed into one of the holes 9 and the collector 11, which allows the coolants to flow in a common counterflow. The coolants exit the heat exchange matrix 1 through other openings 6 and 9, respectively, for the heated and heating coolant. If necessary, openings 9 can be used for entering and leaving the heated coolant, and openings 6 can be used for the heating coolant. The channels of one coolant of lower density are closed by flanges 3 along the perimeter of the matrix, flanges of the other coolant of higher density 12. Holes 6 are closed by flanges of 7 for larger flows 7 Flanges 10 block the coolant flow into the openings 9. Corresponding flanges are hermetically connected in pairs.

Claims (4)

1. A cylindrical plate heat exchanger containing a heat exchange matrix of corrugated plates with flanging of the outer edges and flanging of the collectors, characterized in that each plate has a circle shape, in the central part of which there are corrugations and holes of the collectors of one of the coolant (for example, a coolant of higher density), and in the remaining parts of the circle (in segments) - holes and collectors with flanging of the collectors of another coolant (lower density), the corrugated sections of the plate have battening flanging the outer edges, the outer edges of the same name flange joined by welding (brazing) and sealed against leakage of coolant channels of higher density and lower density of the coolant channels. 2. The cylindrical plate heat exchanger according to claim 1, characterized in that the heat exchange matrix is enclosed in a sealed housing equipped with a sensor for monitoring leakage of coolants from the heat transfer matrix. 3. The cylindrical plate heat exchanger according to claim 1, characterized in that the holes of the collectors of the central part of the matrix are located on the axis of symmetry of the matrix, and the heat carrier channel of higher density has limited longitudinal flanges directing the flow to the periphery and to the center of the plate. 4. The cylindrical plate heat exchanger according to claim 1, characterized in that the holes of the collectors of the Central part of the matrix are located in the corners of the matrix.

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