RU201866U1 - WELDED PLATE HEAT EXCHANGER PLATE - Google Patents

Abstract

The proposed utility model relates to heat engineering and can be applied as an element of a welded plate heat exchanger with a cylindrical body used at industrial facilities for heating or cooling liquid and (or) gaseous working media. The plate of the welded plate heat exchanger (1) is made in the form of a circle. The plate (1) contains a pair of flow holes (2), one of which is intended for supplying the inside-package coolant, the other for its removal. The flow holes (2) are made on one longitudinal central axis, at the same distance from the center of the plate (1). The profile of the plate (1) is made in the form of a combination of solid (3) and local corrugations (4), i.e. is a structure of ridges and depressions arranged in an alternating order, placed at a certain fixed angle to the longitudinal central axis passing through the flow holes (2). Solid corrugations (3) are located over the entire surface of the plate (1) from one edge to the other, interrupted by flow holes (2) and local corrugations (4). Local corrugations (4) are located in the areas of the flow holes (2), on one longitudinal central axis and at the same distance from the center of the plate (1). Local corrugations (4), which have gaps (7) between each other, are assembled in rows dividing solid corrugations (3). Gaps (7) are also made between local (4) and solid corrugations (3). The technical result of the proposed utility model consists in the elimination of stagnant zones during the flow of the in-vessel coolant in the interplate channels. 2 ill.

Description

Technology area

The proposed utility model relates to heat engineering and can be applied as an element of a welded plate heat exchanger with a cylindrical body used at industrial facilities for heating or cooling liquid and (or) gaseous working media.

State of the art

From the prior art, various versions of the plate are known, a plurality of which is assembled into a package, which is a functional part of a welded plate heat exchanger with a cylindrical body. The plate is made in the form of a circle. The profile of the plate is made in the form of corrugation, i.e. is a structure of ridges and depressions arranged in an alternating order, placed at a certain fixed angle to the longitudinal central axis passing through the flow holes. The plate has at least a pair of flow holes to provide supply and discharge of the inside-package coolant. The first plate and the second plate, identical to the first, form a pair of plates. To do this, the second plate must be turned over, rotated 180 degrees and placed on the first plate. These plates are paired with each other by welding along the edges of the flow holes of the in-package coolant. The required number of pairs of plates, determined by the results of the thermohydraulic calculation, is a plate package. For this, adjacent pairs of plates are connected to each other by welding along the outer edges of the plates. Further, support discs are welded to the first and last plates, forming a sealed plate package, which is then built into the cylindrical body of the heat exchanger. The first support disc is provided with flow holes.

Thus, parallel channels are formed for the flow of two heat carriers exchanging thermal energy. The channels with coolants in the package are located alternately. Intra-package coolant flows inside the package in inter-plate channels formed by pairs of plates. The in-casing coolant flows inside the heat exchanger body in the inter-plate channels.

The VAHTERUS OY plate described in WO 9945332 (A1) 1999-09-10, IPC F28D 9/00, IPC F28F 3/08 can be considered an analogue of the proposed utility model. The objective of the patent was to change the angle between the corrugations of the plate while reducing the cost of its manufacturing technology. This was achieved by reworking the areas of the flow holes in the plate. The refinement consisted in creating at least one additional space for a pair of flow holes, the selection of which could be carried out after pressing the plate.

The closest analogue (prototype) of the proposed utility model can be considered a plate ALFA LAVAL CORP AB, described in patent WO 2012159882 (A1) 2012-11-29, IPC F28D 9/00, also published by ALFA LAVAL CORPORATE AB in application RU 2013157563 A, 27.06 .2015 Bul. No. 18. The objective of the patent was to provide a more stress-resistant heat exchanger while maintaining heat transfer at a relatively high level. This was achieved by reworking the areas of the flow holes in the plate. The refinement consisted in reducing the center-to-center distance of the flow holes, i.e. their close position to each other, in addition, the flow holes were equipped with blockers for the distribution of the in-package coolant, allowing it to be directed to stagnant zones.

The general features of the designs of the listed plates and the proposed utility model are as follows:

- plate shape - round;

- the presence of flow holes;

- corrugated heat exchange part;

- the corrugations are located at a certain fixed angle to the longitudinal central axis of the plate;

- the presence of edges of the flow holes and outer edges intended for welding plates in pairs.

The disadvantage of these analogs and prototypes is the uneven distribution of the in-vessel coolant during its flow in the interplate channels, the essence of which becomes clear from the following explanations. The in-vessel coolant enters the heat exchanger body from the inlet pipe located on its cylindrical surface. Further in the body, it is distributed in the interplate channels formed by the gaps between the plates. In the direction of flow of the in-vessel coolant, the first of the two regions with flow holes welded along the edges is located, which is difficult to access for flow. The in-vessel coolant begins to flow around the flow holes along their perimeter, but does not reach the section located behind them on the longitudinal central axis of the plate. This section is the stagnant zone for the plates described above. This arises due to the presence in the described section of solid corrugations extending from one edge of the plate to the other, thereby blocking the flow of the in-vessel coolant, as a result of which it cannot completely flow around the flow holes, therefore it passes the described section of the plates and is then distributed over their corrugated surfaces.

The presence of this stagnant zone has the following consequences that negatively affect the characteristics of the heat exchanger:

- the efficiency of heat exchange between heat carriers decreases;

- during the operation of the heat exchanger, deposits of the internal heat carrier begin to accumulate, gradually blocking the interplate channels.

Disclosure of the essence of the utility model

The objective of the proposed utility model is to design a plate of a welded plate heat exchanger that provides an improved distribution of the in-vessel coolant during its flow in the inter-plate channels.

The technical result, which provides a solution to the problem, is the elimination of stagnant zones during the flow of the in-vessel coolant in the interplate channels.

The technical result is achieved by the fact that the profile of the proposed plate of a welded plate heat exchanger is a combination of solid corrugations extending from one edge of the plate to the other, and corrugations of limited length, in other words, local, located in the areas of flow holes, where during the flow of the in-vessel coolant in the interplate channels a stagnant zone is formed. Local corrugations with gaps between each other are recruited into rows dividing solid corrugations. The length of local corrugations is significantly less than that of solid corrugations. All the gaps formed between the corrugations contribute to an improved distribution of the in-vessel coolant during its flow in the interplate channels.

Brief Description of Drawings

FIG. 1 shows a front view of a plate of a welded plate heat exchanger according to the utility model, a remote element A, explaining the profile of the plate in the areas of flow holes.

FIG. 2 shows cross-sections of two plates, explaining the shape of the interplate channels for the flow of the in-vessel coolant in the areas of the flow holes.

With reference to FIG. 1 shows a plate of a welded plate heat exchanger (1), consisting of a pair of flow holes (2), solid corrugations (3), local corrugations (4), edges (5) of the flow holes (2), outer edges (6), gaps (7 ).

Implementation of the utility model

The plate of the welded plate heat exchanger (1) (Fig. 1) is made in the form of a circle. The plate (1) contains a pair of flow holes (2), one of which is intended for supplying the inside-package coolant, the other for its removal, i.e. the functional purpose of which depends on the flow pattern of the coolants in the heat exchanger and is chosen differently for each specific case. The flow holes (2) are made on one longitudinal central axis, at the same distance from the center of the plate (1). The corrugated heat exchange part of the plate (1) is made in the form of a combination of solid (3) and local corrugations (4), i.e. is a structure of ridges and depressions arranged in an alternating order, placed at a certain fixed angle to the longitudinal central axis passing through the flow holes (2). Solid corrugations (3) are located over the entire surface of the plate (1) from one edge to the other, interrupted by flow holes (2) and local corrugations (4). Local corrugations (4) are located in the areas of the flow holes (2), on one longitudinal central axis and at the same distance from the center of the plate (1). Local corrugations (4), which have gaps (7) between each other, are assembled in rows dividing solid corrugations (3). Gaps (7) are also made between local (4) and solid corrugations (3). The number of local corrugations (4) in one row and the number of rows depends on the characteristics of the plate (1), such as the diameter of the plate (1), the diameter of the flow holes (2), the angle between the arrangement of solid corrugations (3) and the longitudinal central axis. The length of local corrugations (4) is significantly less than that of solid corrugations (3). The angle of the local corrugations (4) may or may not coincide with the angle of the solid corrugations (3). Local corrugations (4) of one row are located at the same angle. The angle of the local corrugations (4) in alternating rows may or may not coincide.

The plate of a welded plate heat exchanger (1) has edges (5) of flow holes (2) and outer edges (6) for welding the plates (1) in pairs. The first plate (1) and the second plate (1), identical to the first, form a pair of plates (1). For this, the second plate (1) is inverted, rotated 180 degrees and superimposed on the first plate (1). These plates are paired with each other by welding along the edges (5) of the flow holes (2). The required number of pairs of plates (1), determined from the results of thermohydraulic calculations, is a package of plates (1). For this, adjacent pairs of plates (1) are connected to each other by welding along the outer edges (6). Further, support discs are welded to the first and second plates (1), forming a sealed plate pack (1), which is then built into the cylindrical body of the welded plate heat exchanger. The first support disc is provided with flow holes. Thus, parallel channels are formed for the flow of two heat carriers exchanging thermal energy. The channels with coolants in the package are located alternately. Intra-package coolant flows inside the package in inter-plate channels formed by pairs of plates (1). Intra-package coolant is supplied and removed through the corresponding flow holes (2) in the plates (1). The in-casing coolant flows inside the heat exchanger body in the inter-plate channels.

A heat exchanger with a package made up of the proposed plates of a welded plate heat exchanger (1) and installed in its cylindrical casing operates as follows.

The in-package and in-casing coolants pass through alternating inter-plate channels formed by a package of plates (1) installed in the cylindrical body of the welded plate heat exchanger. Intra-package coolant enters the inter-plate channels through the flow holes (2) for supply, is distributed over the corrugated surfaces of the plates (1) and exits through the flow holes (2) for the outlet. The in-house coolant enters the body of the welded plate heat exchanger from the inlet pipe located on its cylindrical surface. Further in the body, it is distributed in the interplate channels formed by the gaps between the plates (1). In the direction of flow of the in-vessel coolant, the first of the two areas with welded along the edges (5) flow holes (2) is located. The in-vessel coolant flows around the flow holes (2) along their entire perimeter, including the section located behind them on the longitudinal central axis of the plate (1). In this section, the solid corrugations (3) are separated. In the places of separation, local corrugations (4) are placed, having gaps (7) between them. Gaps (7) are also made between local (4) and solid corrugations (3). All the gaps (7) formed between the corrugations contribute to the unimpeded flow of the in-vessel coolant in the interplate channels in the described area (Fig. 2), so it completely washes the flow holes (2), bending around them. Thus, a uniform distribution of the internal heat carrier is achieved over the width of the plate (1). Further, it is distributed over all corrugated surfaces of the plates (1), enters the rest of the housing and leaves the outlet pipe located on the cylindrical surface of the welded plate heat exchanger.

As a result of the use of a plate of a welded plate heat exchanger, stagnant zones were eliminated during the flow of the in-vessel coolant in the inter-plate channels, therefore, the efficiency of heat transfer between the heat-transfer agents was increased and the accumulation of deposits of the in-vessel coolant in the inter-plate channels was reduced.

The production of a plate of a welded plate heat exchanger can be carried out from known metals, steels and alloys, by known methods, for example, by stamping.

Claims (1)

A plate of a welded plate heat exchanger, made in the form of a circle with the possibility of using a welded plate heat exchanger with a cylindrical body, containing a pair of flow holes made on one longitudinal central axis, at the same distance from the center of the plate, a corrugated heat exchange part, which is a structure of ridges and depressions, located in an alternating order, placed at a certain fixed angle to the longitudinal central axis passing through the flow holes, the edges of the flow holes and the outer edges intended for welding plates in pairs, characterized in that the corrugated heat exchange part is made in the form of a combination of solid corrugations forming the gaps, extended from one edge of the plate to the other, and local corrugations located in the areas of flow holes, on one longitudinal central axis and at the same distance from the center of the plate, having a length much smaller than that of solid corrugations, recruited with gaps in rows dividing solid corrugations.

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