RU2418254C1 - Plate of sprinkler of herring-bone structure and sprinkler unit of cooling tower (versions) - Google Patents

Abstract

FIELD: power industry.

SUBSTANCE: plate of sprinkler of herring-bone structure, which is made from polymer material, for example PVC, includes ruffles in the form of continuous wave; at that, each ruffle is made in the form of zigzag-shaped sequence of short channels similar as to length and section and oriented towards each other at equal angle of not less than 90° and not more than 180°, and ratio of height of ruffle to length of rib of short channel along zigzag-shaped guide is at least 2.5. On the plate base of sprinkler of herring-bone structure there assembled are various versions of sprinkler unit of cooling tower. As per the first and the second version of design the sprinkler unit includes many vertically installed and alternating plates of herring-bone structure and flat plates with formation of zigzag-shaped channels identical as to height of sprinkler unit. As per the second version of design, in sprinkler unit the even corrugated plates of sprinkler of herring-bone structure are turned about horizontal axis through 180° relative to even corrugated plates of sprinkler of herring-bone structure. As per the third version, sprinkler unit includes only plates of herring-bone structure, which are turned relative to each other through 180° and installed so that they have point contact between each other at point of convergence of zigzag-shaped ribs and along each zigzag-shaped rib, and at that, they form through cross zigzag-shaped channels in vertical and horizontal directions, and connecting tubes are installed in places of point contact along zigzag-shaped ribs of corrugated plates of sprinkler of herring-bone structure.

EFFECT: invention allows increasing water cooling efficiency in sprinkler of cooling tower by enlarging inter-phase surface.

5 cl, 4 dwg

Description

The invention relates to the field of recycled water supply, and in particular to structural elements of cooling towers and other apparatus for heat and mass transfer between liquid and gaseous media, in particular, to elements of irrigators and water traps of cooling towers.

A well-known unit of cooling tower irrigation, consisting of vertical corrugated sheets with faceted corrugations, which when bonded together form vertical pipe-shaped channels (RF patent No. 2300067, MKI F28F 25/08, 05/27/2007).

Sprinklers made of polymeric materials are also known, for example, irrigation devices made in the form of a block of plastic pipes (see, for example, RF patent No. 2141616, MKI F28F 25/00, November 20, 1999; RF patent No. 2141617, MKI F28F 25/08, 11/20/1999 )

A common drawback of these designs is their high aerodynamic drag and uneven cooling of water over the area of the tower, due to the closure of the tubular channels of the irrigators.

There are known designs of cooling tower sprinkler sheets containing corrugations in the form of a continuous wave located at an angle to the edge of the sheet (UK patent No. 11777124, F28C 3/00, 1970; US patent No. 4668443, NKI 261-1123, 1987; RF patent No. 2001375, MKI F28F 25/08, 1993).

A common drawback of these designs of irrigator sheets, as operation practice shows, is the appearance and stable existence of a jet fluid flow in the corrugations of the corrugations, which reduces the intensity of heat and mass transfer.

Known designs of sheets of cooling tower irrigation containing sinusoidal corrugations, located along the height of the sheet in the form of two or more sections, inclined to one side from the vertical (RF patent No. 2222758, MKI F28F 25/08, 01/27/2004; RF patent No. 2257521, MKI F28F 25/08, 07/27/2005).

The presence of a broken corrugation, and with an inclination to one side from the vertical, reduces the time of passage of water along the height of the sprinkler sheet and thereby reduces the efficiency of heat and mass transfer.

There are known designs of a sprinkler sheet containing sinusoidal corrugations located at opposite angles of inclination to the edge of the sheet (RF patent No. 2109242, MKI F28F 25/08, 04/20/1998; RF patent No. 2306519, MKI F28F 25/08, 09/20/2007).

The main disadvantage of these irrigator sheets is the considerable length of the inclined sections, which initiates the appearance of a jet stream of water in the corrugations of the corrugations.

The closest to the invention in technical essence and the achieved result is a sheet of cooling tower sprinkler containing sinusoidal corrugations located along the height of the sheet in the form of two or more sections with opposite angles of inclination to the horizontal, and with decreasing values of these angles in the sections from the bottom up while maintaining the height and the width of the corrugations, the angles at the peaks and troughs are reduced (RF patent No. 2217676, MKI F28F 25/08, 11/27/2003). This invention is taken as a prototype.

The implementation of the sprinkler sheet described above has certain drawbacks, namely, a decrease in the passage section of the channels and sharp bends of short channels along the height of the sheet, which leads to an increase in the aerodynamic drag of the sprinkler. A decrease in the angle of inclination relative to the horizontal of the short channels leads to their significant elongation, which provokes the appearance of a jet stream, which also leads to a decrease in the efficiency of heat and mass transfer.

The present invention solves the problem of increasing the efficiency of cooling water in the tower sprinkler by increasing the specific interfacial surface, and, accordingly, the phase contact time.

To achieve this technical result, a chevron structure sprinkler sheet made of a polymeric material, for example PVC, contains corrugations in the form of a continuous wave, while each corrugation is made in the form of a zigzag sequence of short channels of equal length and cross section, oriented to each other at the same angle less than 90 ° and not more than 180 °, and the ratio of the corrugation height to the length of the edges of the short channel along the zigzag guide is at least 2, 5.

Known irrigation devices made in the form of blocks of vertical or at an angle to the vertical of plastic pipes of various shapes in cross section (Gladkov V.A., Kucherenko D.I. Recycled water supply. (Water cooling systems). - M: Stroyizdat, 1980; patent RF №2309356, MKI F28F 25/08, 10.27.2007; RF patent No. 2317502, MKI F28F 25/08, 02.20.2008).

The disadvantage of this type of irrigation blocks is a small specific interphase surface and a short contact time of the phases and, as a result, the low efficiency of heat and mass transfer.

Known irrigation blocks made up of sheets with straight corrugations having a continuous wave in cross section and located along a vertical edge (RF patent No. 2300067, MKI F28F 25/08, 05/27/2007) or at an angle to it (RF patent No. 2043600, MKI F28F 25/08, 09/10/1995; RF patent No. 2133427, MKI F28F 25/08, 07/20/1999).

A well-known cooling tower sprinkler consisting of blocks assembled in packages of vertically mounted corrugated sheets with parallel corrugations located at an angle to the edges of the sheet, each corrugated sheet contains two groups of parallel corrugations converging in the middle of the sheet, while the corrugations of the left half of the sheet are inclined to the right from the vertical, the corrugations of the right half of the sheet are inclined to the left of the vertical, and the corrugated sheets assembled in a packet form rhomboid channels in cross section (RF patent No. 2306519, MKI F28F 25/08, 09/20/2007).

The main disadvantage of the irrigator is the considerable length of the channels, which initiates the appearance of a jet stream of water in the corrugations of the corrugations.

More efficient, from the point of view of heat and mass transfer, are irrigation blocks in which the corrugations of adjacent sheets are located at an angle to each other (RF patent No. 2008607, MKI F28F 25/08, 02/28/1994; RF patent No. 2122696, MKI F28F 25/08, 11.27.1998; RF patent No. 2132032, MKI F28F 25/08, 06/20/1999; RF patent No. 2145699, MKI F28F 25/08, 02.20.2000).

From the above totality of the last group of analogues, the closest to the invention in terms of technical essence and the achieved result is a tower sprinkler containing sheets with corrugations in the form of a continuous wave that contact each other along the crests of the corrugations with the formation of channels along the height of the sprinkler, while the corrugations are made at an angle to the edges of the sheets, and the corrugations of adjacent sheets can be oriented in the same direction and at an angle to each other (RF patent No. 2132032, MKI F28F 25/08, 06/20/1999).

A common drawback of this type of sprinkler blocks is the existence of a jet fluid flow in the corrugations of the corrugations, which reduces the heat and mass transfer, since the basis of the sprinkler block is corrugated sheets forming channels of various shapes in the assembled block, but all with a straight guide.

The objective of the invention is to increase the efficiency of heat and mass transfer and the rigidity of the sprinkler block.

According to the first embodiment of the block, the technical result is achieved in that in the sprinkler block containing alternating vertical flat and corrugated chevron structure sprinkler sheets made of a polymeric material, for example PVC, and interconnected by connecting tubes, the block contains a lot of chevron structure sprinkler sheets wherein each corrugated sheet of the chevron structure along zigzag lines of edges is in contact with flat sheets with the formation of identical zigzag of communication channels adjustment of the sprinkler unit and is connected with one of the flat sheets a rigid connection, for example by welding.

According to the second embodiment, the technical result is achieved in that in the sprinkler block the even corrugated sheets of the chevron structure sprinkler are rotated around the horizontal axis by 180 ° relative to the odd corrugated sheets of the sprinkler of the chevron structure.

According to the third embodiment, the technical result is achieved by the fact that the sheets are mounted in the sprinkler block so that they have point contact with each other at the points of convergence of the zigzag ribs and along each zigzag rib and at the same time form cross zigzag cross channels in the vertical and horizontal directions, and connecting the tubes are installed in the places of point contact along the zigzag ribs of the corrugated sheets of the irrigator of the chevron structure.

The claimed invention is illustrated by drawings, in which Fig. 1 shows a general view of a chevron structure sprinkler sheet, Fig. 2 is a general view of a sprinkler block according to a first embodiment, Fig. 3 is a general view of a sprinkler block according to a second embodiment, Fig. 4 - a general view of the sprinkler block according to the third embodiment.

In figures 1 to 4, the numbers indicate the following positions: 1 - leaf of the irrigator of the chevron structure, 2 - zigzag corrugation, 3 - short channel, 4 - flat sheet, 5 - zigzag channel, 6 - zigzag edges of the sheet, 7 - connecting tubes.

Sheet 1 (figure 1) of the chevron structure sprinkler is a three-dimensional structure and contains corrugations 2 in the form of a continuous wave from one edge of the sheet to the other. Each corrugation 2 is made in the form of a zigzag sequence of the same length and cross section of the short channels 3, oriented to each other at the same angles. This mutual angular position of the short channels 3 determines the name of the structure of the sprinkler sheet — the chevron structure. Sheets 1 are assembled in a vertical position in a block with the formation of many zigzag channels. Using sheet 1 of the chevron structure sprinkler, it is possible to carry out a number of options for the cooling tower sprinkler block.

The sprinkler block according to the first embodiment comprises a plurality of vertically mounted and alternating sheets 1 of a chevron structure and flat sheets 4 with the formation of identical zigzag channels 5 along the height of the sprinkler block (Fig. 2).

The sprinkler block according to the second embodiment also contains a plurality of vertically mounted and alternating sheets 1 of chevron structure and flat sheets 4 with the formation of identical zigzag channels 5 along the height of the sprinkler block, but even corrugated sheets of the sprinkler of the chevron structure are rotated around the horizontal axis by 180 ° relative to the odd corrugated sheets sprinkler chevron structure (figure 3).

In the first and second embodiments of the blocks, each corrugated sheet 1 of the chevron structure sprinkler is connected to one of the flat sheet 4 in contact with it by a rigid connection, for example by welding, along all zigzag ribs 6. The whole set of corrugated sheets 1 and flat sheets 4 included in the block, tightened together by connecting tubes 7.

The sprinkler block according to the third embodiment contains only sheets of a chevron structure that are rotated 180 ° relative to each other and are installed in such a way that they have point contact with each other at the points of convergence of the zigzag ribs 6 and along each zigzag rib 6 and form through vertical and horizontal directions, cross zigzag channels 5, and connecting tubes 7 are installed at the points of point contact along the zigzag edges of the corrugated sheets of the chevron stream sprinkler ktury (figure 4).

The sprinkler block, composed of sheets 1 of the chevron structure, works as follows. Cooled water, evenly distributed on the surface of the sheets 1 of the cooling tower sprinkler block, flows vertically under the action of gravity along the walls of the zigzag corrugations 2. Due to the presence of short channels 3, constantly changing their direction, the distance for the passage of water is significantly extended, and the direction vector of the movement of cooling air changes , which leads to additional turbulization of the flowing film of water through zigzag channels 5, which ultimately increases the efficiency of heat and mass transfer. The block made according to the third embodiment, due to the presence of cross zigzag channels 5, allows to obtain a more even distribution of cooled water over the entire area of the sheets 1. Introduced restrictions on the angle of convergence of the short channels and the ratio of the height of the corrugation to the length of the rib of the short channel along the zigzag guide reduce the aerodynamic drag of . The flat sheets 4 used for the first and second embodiments of the sprinkler block provide additional rigidity to the blocks.

Thus, the application of the invention improves the important technological and operational parameters of the sprinkler: firstly, to increase the degree of water cooling, secondly, to reduce aerodynamic drag and, thirdly, to increase the rigidity of the structure, and hence its durability.

Claims (5)

1. A sprinkler sheet of a chevron structure made of a polymeric material, for example PVC, containing corrugations in the form of a continuous wave, characterized in that each corrugation is made in the form of a zigzag sequence of short channels of equal length and cross section, oriented to each other at the same angle of at least 90 ° and not more than 180 °, while the ratio of the corrugation height to the length of the rib of the short channel along the zigzag guide is at least 2.5. 2. A sprinkler block containing alternating vertical flat and corrugated sprinkler sheets made of a polymeric material, for example PVC, and interconnected by connecting tubes, characterized in that it contains a plurality of chevron structure sprinkler sheets according to claim 1, wherein each corrugated the sheet of the chevron structure along the zigzag lines of the ribs is in contact with the flat sheets with the formation of identical zigzag channels along the height of the sprinkler block and is connected to one of the flat sheets of rigid bond, for example by welding. 3. The sprinkler block according to claim 2, characterized in that the even corrugated sheets of the chevron structure sprinkler are rotated around the horizontal axis by 180 ° relative to the odd corrugated sheets of the sprinkler of the chevron structure. 4. A sprinkler block containing corrugated sprinkler sheets made of a polymeric material, for example PVC, adjacent sheets of which are rotated 180 ° relative to each other and interconnected by connecting tubes, characterized in that the sheets are installed in such a way that they have point contact between each other at the points of convergence of the zigzag ribs and along each zigzag rib and at the same time form cross zigzag channels in the vertical and horizontal directions. 5. The sprinkler block according to claim 4, characterized in that the connecting tubes are installed in the places of point contact along the zigzag ribs of the corrugated sheets of the sprinkler of the chevron structure.

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