WO2022135623A1 - Tubular shell heat exchanger with sheet baffles - Google Patents
Tubular shell heat exchanger with sheet baffles Download PDFInfo
- Publication number
- WO2022135623A1 WO2022135623A1 PCT/CZ2020/000055 CZ2020000055W WO2022135623A1 WO 2022135623 A1 WO2022135623 A1 WO 2022135623A1 CZ 2020000055 W CZ2020000055 W CZ 2020000055W WO 2022135623 A1 WO2022135623 A1 WO 2022135623A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sheets
- heat exchanger
- baffle
- baffles
- shell
- Prior art date
Links
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 238000009434 installation Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000005549 size reduction Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/24—Arrangements for promoting turbulent flow of heat-exchange media, e.g. by plates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/163—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing
- F28D7/1669—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with conduit assemblies having a particular shape, e.g. square or annular; with assemblies of conduits having different geometrical features; with multiple groups of conduits connected in series or parallel and arranged inside common casing the conduit assemblies having an annular shape; the conduits being assembled around a central distribution tube
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
- F28F9/22—Arrangements for directing heat-exchange media into successive compartments, e.g. arrangements of guide plates
- F28F2009/222—Particular guide plates, baffles or deflectors, e.g. having particular orientation relative to an elongated casing or conduit
- F28F2009/228—Oblique partitions
Definitions
- the invention relates to a tubular shell heat exchanger with intense helical turbulent flow.
- Tubular shell heat exchangers are currently the most common type of heat exchangers and are widely used in the oil, chemical and/or energy industries. According to statistics, this type of heat exchanger is the most widespread on the world market and had about 37 % share, while in the petrochemical area the use of this type of heat exchanger is even greater, namely up to 70 %.
- heat exchanged takes place through walls of the tubes forming a closed tube system with different configurations. Differently warm media are located on both sides of the wall surfaces of the pipe systems and heat is transferred to the cooler medium through the wall surface of the tube bundle.
- Baffles are installed inside the shell to provide mechanical support to the tube bundle. The medium inside the shell flows through a system of baffles, which helps to create a turbulent flow so that the best possible parameters of heat transfer between the media are achieved.
- Convetional heat exchangers with built-in type of pipe system with baffles are used in industrial applications, but they still need to be significantly streamlined and eliminate a number of following disadvantages.
- the medium inside the shell must constantly change the speed and direction of the flow, there is an enormous loss of pressure during the passage of the medium through the heat exchanger and the demand for power and thus the energy consumption of the pumps increases. Furthermore, especially on the rear sides of baffles, zones of flow stagnation are created, which reduces the efficiency of the heat exchanger and can cause the accumulation of impurities with all the negative effects.
- the medium inside the shell flows continuously both around the tube bundle and laterally, which causes vibrations and consequently fatigue damage to the tube bundle, thus shortening the servise life of the entire system.
- the aim of the invention to provide a heat exchanger which overcomes the problems described above.
- tubular shell heat exchanger with sheet baffles which is characterised by the fact that three sheets in the form of circular segments having two lateral straight edges converging to the tip are arranged around the central tube, the straight edges are connected on the other side by the outer connecting edge, sheets are arranged at regular angular distances from each other, whereas the curvature of the connecting edge corresponds to the curvature of the inner surface of the shell, whereas the three sheets form the basic baffle and are inclined so, that the angular orientation of the individual sheets is such, that each sheet is inclined in the same direction and at the same angle of 1 to 89 degrees with respect to a plane perpendicular to the central tube, whereas the sheets are provided with openings, whereas the sheet is on the other side provided with a peripheral opening, which is arranged at junction of one of the side edges and the outer connecting edge in support tubes, which are regurarly distributed around the circumference of the tube plates in a number of six, whereas through other openings in the
- sheets of the baffles are inclined in the same direction relative to a plane perpendicular to the axis of the heat exchanger.
- the sheet of the baffles are inclined relative a plane perpendicular to the axis of the heat exchanger in the opposite direction to the sheets of the baffles.
- FIG. 1 represents a schematic longitudinal section of a heat exchanger with parallel baffles according to the invention
- Fig. 2 represents a view of the internal arrangement of the heat exchanger in Fig. 1
- Fig. 3 represents a schematic longitudinal section of a heat exchanger with baffles with opposite orientation
- Fig. 4 is a view of the internal arrangement of the heat exchanger of Fig. 3
- Fig. 5 represents a view of a detail of the construction of the heat exchanger baffles in Fig. 3.
- Fig. 1 shows a schematic longitudinal section of a heat exchanger 1, which is formed by an outer shell 2 with a central tube 5, which is arranged in the axis of the heat exchanger 1.
- a heat exchanger 1 which is formed by an outer shell 2 with a central tube 5, which is arranged in the axis of the heat exchanger 1.
- two tube plates 3, 11 are arranged, namely inlet tube plate 3 on one side and the outlet tube plate 11 on the other side, the two tube plates 3, 11 are connected by a set of tubes 8 which are mutually parallel to the axis of the exchanger 1 and their ends are fixed in the openings of the tube plates 3, 11.
- An inlet 4 of the first medium is arranged axially on the inlet tube plate side 3 and an inlet 9 of the second medium is arranged tangentially to the shell and an outlet 12 of the first medium is arranged axially on the side of the outlet tube plate 11 and an outlet 10 of the second medium is arranged tangentially to the shell.
- three sheets 13 are arranged around the central tube 5, forming baffles 6, 7.
- Sheets 13 have the shape of circular segments having two lateral straight edges 14 converging into a tip 17 whereas the straight edges are on the other side connected by an outer connecting edge 15.
- the three sheets 13 are arranged within the baffle 6, 7 so, that their tips 17 meet on the outer circumference of the central tube 5 in one horizontal plane.
- Fig. 1 shows a heat exchanger 1 in longitudinal section with parallel baffles 6 and their sheets have the same orientation in a comparision with the configuration in Fig. 3 and Fig. 2 shows its internal arrangement, where the internal installation of the heat exchanger consisting of tube plates 3, 11 snd of a central tube 5 arranged in the axis can be seen, furthermore, six regularly spaced support tubes 8, which pass through a peripheral opening in the sheet 13, which is at the junction of one of the side edges 14 and the outer connecting edge 15, while other openings 20 in the sheet pass through tubes (not shown) for the first medium.
- baffles 6 and 7 there are two types of baffles 6 and 7 in the heat exchanger, namely basic baffles 6 and circle offset baffles 7, whereas these two baffles 6, 7 form a baffle assembly 16.
- the geometric relationships in the baffle assembly 16 will be explained in detail describing situation in Fig. 5.
- the sheets of the baffles 6, 7 are orientated with the same inclination, i.e. the sheets 13 of the baffles 6 and 7 are inclined to the same side with respect to a plane perpendicular to the axis of the heat exchanger 1.
- baffles 6 and 7 The difference between baffles 6 and 7 is that the sheets 13 of the circle offset baffle 7 are angularly offset relative to the sheets 13 of the basic baffle 6 so in axial projections sheets 13 of the circle offset baffles 7 essentially cover the gaps between the sheets 13 of the basic baffle 6 and in axial view all six sheets 13 in the baffle assembly 16 form a complete but divided circle.
- the baffles 6, 7 of the baffle assembly 16 regulate the flow path of the second medium in a longitudinal-helical shape from the inlet 9 to the outlet 10.
- Fig. 3 shows the heat exchanger 1 in longitudinal section with buffles 6, 7, orientated in the mutual opposite directions and Fig. 4 then shows its internal arrangement.
- the sheets 13 of the basic baffle 6 are oriented within the baffle assembly 16 with their inclination to the opposite side than the sheets 13 of the circle offset baffle 7, because these are inclined to the opposite side with respect to a plane perpendicular to the axis of the exchanger 1. It can be seen in Fig.
- baffle assemblies 16 are arranged one behind the other in this embodiment, in the illustrated embodiments there are three as shown in Figs. 1 to 4, but their number can be arbitrary.
- Fig. 5 shows a detail view of the construction of baffles 6 and 7 of the heat exchanger 1 in the embodiment with baffles orientated in the mutual opposite directions.
- the side edges 14 facing the central tube 5 are straight and the outer connecting edge 15 is curved and its curvature corresponds to the curvature of the inner surface of the shell 2.
- Buffies 6 and 7 are arranged at regular intervals.
- the sheets 13 are inclined within baffles 6, 7 so, that the angular orientation of the individual sheets 13 is such that each sheet 13 is inclined at an angle of 1 to 89 degrees with respect to a plane perpendicular to the central tube 5, whereas the orientation of the inclination is at all buffles 6, 7 the same.
- the points of contact of the tips 17 of the sheets 13 of individual baffles 6 and 7 are distributed on the central tube 5 at regular intervals along the entire length of the inner space of the shell 2 between the tube plates 3, 11.
- the individual sheets of the basic baffle 6 have reference signs 6A, 6B and 6C and the individual sheets of the circle offset baffle 7 have reference signs 7A, 7B and 7C. It can be seen here how the individual sheets of the buffles 6 and 7 are inclined and offset relative to each other, so that the sheets of the circle offset baffle 7 are inclined to the opposite side than the sheets 13 of the basic baffle 6.
- the baffles 6, 7 are not continuous, but there are gaps between the individual sheet 13, the pressure drop and the power requirement of the pumps are reduced compared to the usual arrangement of the baffles.
- the offset and inclination of the sheets of the baffles 6, 7 give the flowing medium helical trajectories, which increases the degree of mixing and at the same time increases the heat exchange coefficient.
- the dead flow zone is reduced, effectively preventing the accumulation of inpurities, tube bundle vibration is reduced, system service life is increased and necessary time to repairs or failure is extended.
- the longitudinal flow of the medium at the shell between the helical sheet buffles can significantly reduce the induced vibrations of the fluid and thus the failure rate or the time to regular shutdown. Adjusting the inclination angle of the sheets 13 will make it possible to optimally regulate the pressure drop and increase the heat transfer coefficient, which eliminates the disadvantages of the stagnation flow zone which occur in traditional heat exchangers.
- the purpose of the present invention is a new arrangement of a tubular shell heat exchanger with sheet baffles with the aim of:
Abstract
Tubular shell heat exchanger (1) where an inlet (4) of the first medium is arranged axially on the side of the inlet tube plate (3) and an inlet (9) of the second medium is arranged tangentially to the shell (2) and on the side of the outlet tube plate (11) an outlet (10) of the second medium is tangetially arranged and an outlet (12) of the first medium is axially arranged to the shell (2), where three sheets (13) in the form of circular segments having two lateral straight edges (14) converging to the tip (17) are arranged around the central tube (5), the straight edges (14) are connected on the other side by the outer connecting edge (15), sheets (13) are arranged at regular angular distances from each other, whereas the three sheets (13) form the basic baffle (6) and are inclined so, that the angular orientation of the individual sheets (13) is such, that each sheet (13) is inclined in the same direction and at the same angle of 1 to 89 degrees with respect to a plane perpendicular to the central tube (5), whereas each basic baffle (6) is associated with a circle offset baffle (7) and forms a baffle assembly (16) with it, where the sheets (13) of the circle offset baffles (7) are angularly offset relative to the sheets (13) of the basic baffle (6) around the axis of the heat exchanger (1) so, that in axial projection the sheets (13) of the circle offset baffle (7) essentially cover the gaps between the sheets (13) of the basic baffle and in axial view form all six sheets (13) in the baffle assembly (16) a complete but (6) divided circle.
Description
Tubular shell heat exchanger with sheet baffles
Technical field
The invention relates to a tubular shell heat exchanger with intense helical turbulent flow.
Background art
Tubular shell heat exchangers are currently the most common type of heat exchangers and are widely used in the oil, chemical and/or energy industries. According to statistics, this type of heat exchanger is the most widespread on the world market and had about 37 % share, while in the petrochemical area the use of this type of heat exchanger is even greater, namely up to 70 %.
The harsh conditions of this industry result in challenging demands on heat exchangers, especially concerning performance, wear resistance and clogging, as well as relatively simple maintenance. Therefore, designers are constantly deal with the possibility of improving and eliminating the shortcomings of existing heat exchangers and they come up with new ideas and constructions, especially arrangements and installations, in order to intensify and eliminate shortcomings.
In the heat exchanger, heat exchanged takes place through walls of the tubes forming a closed tube system with different configurations. Differently warm media are located on both sides of the wall surfaces of the pipe systems and heat is transferred to the cooler medium through the wall surface of the tube bundle. Baffles are installed inside the shell to provide mechanical support to the tube bundle. The medium inside the shell flows through a system of baffles, which helps to create a turbulent flow so that the best possible parameters of heat transfer between the media are achieved.
Convetional heat exchangers with built-in type of pipe system with baffles are used in industrial applications, but they still need to be significantly streamlined and eliminate a number of following disadvantages. The medium inside the shell must constantly change the speed and direction of the flow, there is an enormous loss of pressure during the passage of the medium through the heat exchanger and the demand for power and thus the energy consumption of the pumps increases. Furthermore, especially on the rear sides of baffles, zones of flow stagnation are created, which reduces the efficiency of the heat exchanger and can cause the accumulation of impurities with all the negative effects. In addition, the medium inside the shell flows continuously both around the tube bundle and
laterally, which causes vibrations and consequently fatigue damage to the tube bundle, thus shortening the servise life of the entire system.
Undesirable flows and bypasses can be created between the tube plate and the shell, which reduces the efficiency of heat exchange inside the shell. Therefore, longitudinal flow heat exchangers have been designed to overcome this shortcoming. The internal installation of such heat exchangers is designed so, that the medium inside the shell flows along the tube bundle, which should ensure a reduction in the pressure loss inside the shell. However, existing longitudinal flow heat exchangers still use baffles or grating plates, e.g. a heat exchanger generally composed of two or more flat fan-shaped plates is disclosed in CN 206094996 U. Although such a heat exchanger reduces pressure loss, it also significantly reduces efficiency of heat exchange, whereas the longitudinal flow of high-velocity fluid at the end of its passage through the shell impinges on the tube plate, which shortens the servise life of the heat exchanger and of the entire system of tubes.
The aim of the invention to provide a heat exchanger which overcomes the problems described above.
Summary of the invention
The above mentioned deficiencies are eliminated by the tubular shell heat exchanger with sheet baffles according to the invention, which is characterised by the fact that three sheets in the form of circular segments having two lateral straight edges converging to the tip are arranged around the central tube, the straight edges are connected on the other side by the outer connecting edge, sheets are arranged at regular angular distances from each other, whereas the curvature of the connecting edge corresponds to the curvature of the inner surface of the shell, whereas the three sheets form the basic baffle and are inclined so, that the angular orientation of the individual sheets is such, that each sheet is inclined in the same direction and at the same angle of 1 to 89 degrees with respect to a plane perpendicular to the central tube, whereas the sheets are provided with openings, whereas the sheet is on the other side provided with a peripheral opening, which is arranged at junction of one of the side edges and the outer connecting edge in support tubes, which are regurarly distributed around the circumference of the tube plates in a number of six, whereas through other openings in the sheet pass the tubes for the first medium, whereas each basic baffle is associated with a circle offset baffle and forms a baffle assembly with it, whereas the sheets of the circle offset baffles are angularly offset relative to the sheets of the basic baffle around the axis
of the heat exchanger so, that in axial projection the sheets of the circle offset baffle essentially cover the gaps between the sheets of the basic baffle and in axial view form all six sheets in the baffle assembly a complete but divided circle, whereas the points of contact of the tips of the sheets of the individual baffles are distributed on the central tube at regular intervals along the entire length of the inner space of the shell between the tube plates and the three sheets are arranged within the baffle so, that their tips meet on the outer circumference of the central tube in one horizontal plane, whereas the basic baffles and the circle offset baffles are arranged at a distance from each other.
In a preferred embodiment sheets of the baffles are inclined in the same direction relative to a plane perpendicular to the axis of the heat exchanger.
In another embodiment the sheet of the baffles are inclined relative a plane perpendicular to the axis of the heat exchanger in the opposite direction to the sheets of the baffles.
Brief description of drawings
The invention will be further explained by means of the drawings, in which Fig. 1 represents a schematic longitudinal section of a heat exchanger with parallel baffles according to the invention; Fig. 2 represents a view of the internal arrangement of the heat exchanger in Fig. 1; Fig. 3 represents a schematic longitudinal section of a heat exchanger with baffles with opposite orientation, Fig. 4 is a view of the internal arrangement of the heat exchanger of Fig. 3 and Fig. 5 represents a view of a detail of the construction of the heat exchanger baffles in Fig. 3.
Detailed description of drawings
Fig. 1 shows a schematic longitudinal section of a heat exchanger 1, which is formed by an outer shell 2 with a central tube 5, which is arranged in the axis of the heat exchanger 1. Inside the shell 2 two tube plates 3, 11 are arranged, namely inlet tube plate 3 on one side and the outlet tube plate 11 on the other side, the two tube plates 3, 11 are connected by a set of tubes 8 which are mutually parallel to the axis of the exchanger 1 and their ends are fixed in the openings of the tube plates 3, 11. An inlet 4 of the first medium is arranged axially on the inlet tube plate side 3 and an inlet 9 of the second medium is arranged tangentially to the shell and an outlet 12 of the first medium is arranged axially on the side of the outlet tube plate 11 and an outlet 10 of the second medium is arranged tangentially to the shell.
As can be better seen in Fig. 2, three sheets 13 are arranged around the central tube 5, forming baffles 6, 7. Sheets 13 have the shape of circular segments having two lateral straight edges 14 converging into a tip 17 whereas the straight edges are on the other side connected by an outer connecting edge 15. The three sheets 13 are arranged within the baffle 6, 7 so, that their tips 17 meet on the outer circumference of the central tube 5 in one horizontal plane.
Fig. 1 shows a heat exchanger 1 in longitudinal section with parallel baffles 6 and their sheets have the same orientation in a comparision with the configuration in Fig. 3 and Fig. 2 shows its internal arrangement, where the internal installation of the heat exchanger consisting of tube plates 3, 11 snd of a central tube 5 arranged in the axis can be seen, furthermore, six regularly spaced support tubes 8, which pass through a peripheral opening in the sheet 13, which is at the junction of one of the side edges 14 and the outer connecting edge 15, while other openings 20 in the sheet pass through tubes (not shown) for the first medium.
It can be seen in Fig. 1 that there are two types of baffles 6 and 7 in the heat exchanger, namely basic baffles 6 and circle offset baffles 7, whereas these two baffles 6, 7 form a baffle assembly 16. The geometric relationships in the baffle assembly 16 will be explained in detail describing situation in Fig. 5. The sheets of the baffles 6, 7 are orientated with the same inclination, i.e. the sheets 13 of the baffles 6 and 7 are inclined to the same side with respect to a plane perpendicular to the axis of the heat exchanger 1. The difference between baffles 6 and 7 is that the sheets 13 of the circle offset baffle 7 are angularly offset relative to the sheets 13 of the basic baffle 6 so in axial projections sheets 13 of the circle offset baffles 7 essentially cover the gaps between the sheets 13 of the basic baffle 6 and in axial view all six sheets 13 in the baffle assembly 16 form a complete but divided circle. In this arrangement, the baffles 6, 7 of the baffle assembly 16 regulate the flow path of the second medium in a longitudinal-helical shape from the inlet 9 to the outlet 10.
Fig. 3 shows the heat exchanger 1 in longitudinal section with buffles 6, 7, orientated in the mutual opposite directions and Fig. 4 then shows its internal arrangement. The sheets 13 of the basic baffle 6 are oriented within the baffle assembly 16 with their inclination to the opposite side than the sheets 13 of the circle offset baffle 7, because these are inclined to the opposite side with respect to a plane perpendicular to the axis of the exchanger 1. It can be seen in Fig. 4 that the installation of the heat exchanger in the embodiment with a counter-arrangement of the baffles 6, 7 again
consists of tube plates 3, 11, a central tube 5 arranged axially, and four regularly spaced support tubes 8, which again pass through the peripheral opening in a sheet 13 which is at the junction of one of the side edges 14 and the outer connecting edge 15, while other openings 20 in the sheet pass through tubes (not shown) for the first medium.
It is obvious that several baffle assemblies 16 are arranged one behind the other in this embodiment, in the illustrated embodiments there are three as shown in Figs. 1 to 4, but their number can be arbitrary.
Fig. 5 shows a detail view of the construction of baffles 6 and 7 of the heat exchanger 1 in the embodiment with baffles orientated in the mutual opposite directions. The side edges 14 facing the central tube 5 are straight and the outer connecting edge 15 is curved and its curvature corresponds to the curvature of the inner surface of the shell 2. Buffies 6 and 7 are arranged at regular intervals. The sheets 13 are inclined within baffles 6, 7 so, that the angular orientation of the individual sheets 13 is such that each sheet 13 is inclined at an angle of 1 to 89 degrees with respect to a plane perpendicular to the central tube 5, whereas the orientation of the inclination is at all buffles 6, 7 the same. The points of contact of the tips 17 of the sheets 13 of individual baffles 6 and 7 are distributed on the central tube 5 at regular intervals along the entire length of the inner space of the shell 2 between the tube plates 3, 11.
For better clarity, the individual sheets of the basic baffle 6 have reference signs 6A, 6B and 6C and the individual sheets of the circle offset baffle 7 have reference signs 7A, 7B and 7C. It can be seen here how the individual sheets of the buffles 6 and 7 are inclined and offset relative to each other, so that the sheets of the circle offset baffle 7 are inclined to the opposite side than the sheets 13 of the basic baffle 6.
Because the baffles 6, 7 are not continuous, but there are gaps between the individual sheet 13, the pressure drop and the power requirement of the pumps are reduced compared to the usual arrangement of the baffles. The offset and inclination of the sheets of the baffles 6, 7 give the flowing medium helical trajectories, which increases the degree of mixing and at the same time increases the heat exchange coefficient. Furthermore, the dead flow zone is reduced, effectively preventing the accumulation of inpurities, tube bundle vibration is reduced, system service life is increased and necessary time to repairs or failure is extended. The longitudinal flow of the medium at the shell between the helical sheet buffles can significantly reduce the induced vibrations of the fluid and thus the failure rate or the time to regular shutdown. Adjusting the inclination angle of the sheets 13 will make it possible to optimally regulate the pressure drop and increase the
heat transfer coefficient, which eliminates the disadvantages of the stagnation flow zone which occur in traditional heat exchangers.
The purpose of the present invention is a new arrangement of a tubular shell heat exchanger with sheet baffles with the aim of:
- reduction of pressure loss by reducing flow resistance and thus, in particular, saving electrical energy,
- increase of the heat transfer coefficient and thus the possibility of size reduction of the heat exchanger while maintaining the same performance,
- reduction of vibration of the tube bundle and thus reduction of failure rate or extension of necessary time to of shutdown,
- reduction of clogging and thus increase of heat transfer efficiency and safe operation time.
Claims
1. Tubular shell heat exchanger (1) comprising an outer shell (2) with a central tube (5) arranged in the axis of the heat exchanger (1), whereas an inlet tube plate (3) is arranged inside the shell on one side of the heat exchanger (1) and an outlet tube plate (11) on the other side, whereas both tube plates (3, 11) are connected by bundle of tubes which are parallel to the axis of the heat exchanger (1) and their ends are fixed in openings of the tube plates (3, 11), whereas an inlet (4) of the first medium is arranged axially on the side of the inlet tube plate (3) and an inlet (9) of the second medium is arranged tangentially to the shell (2) and on the side of the outlet tube plate (11) an outlet (10) of the second medium is tangetially arranged and an outlet (12) of the first medium is axially arranged to the shell (2), characterized in that three sheets (13) in the form of circular segments having two lateral straight edges (14) converging to the tip (17) are arranged around the central tube (5), the straight edges (14) are connected on the other side by the outer connecting edge (15), sheets (13) are arranged at regular angular distances from each other, whereas the curvature of the connecting edge (15) corresponds to the curvature of the inner surface of the shell (2), whereas the three sheets (13) form the basic baffle (6) and are inclined so, that the angular orientation of the individual sheets (13) is such, that each sheet (13) is inclined in the same direction and at the same angle of 1 to 89 degrees with respect to a plane perpendicular to the central tube (5), whereas the sheets (13) are provided with openings (20), whereas the sheet (13) is on the other side provided with a peripheral opening (20), which is arranged at junction of one of the side edges (14) and the outer connecting edge (15) in support tubes (8), which are regurarly distributed around the circumference of the tube plates (3, 11) in a number of six, whereas through other openings in the sheet (13) pass the tubes for the first medium, whereas each basic baffle (6) is associated with a circle offset baffle (7) and forms a baffle assembly (16) with it, whereas the sheets (13) of the circle offset baffles (7) are angularly offset relative to the sheets (13) of the basic baffle (6) around the axis of the heat exchanger (1) so, that in axial projection the sheets (13) of the circle offset baffle (7) essentially cover the gaps between the sheets (13) of the basic baffle (6) and in axial view form all six sheets (13) in the baffle assembly (16) a complete but divided circle, whereas the points of contact of the tips (17) of the sheets (13) of the individual baffles (6, 7) are distributed on the central tube (5) at regular intervals along the entire length of the inner space of the shell (2) between the tube plates (3, 11) and the three sheets (13) are arranged within the baffle (6, 7) so, that their
8 tips (17) meet on the outer circumference of the central tube (5) in one horizontal plane, whereas the basic baffles (6) and the circle offset baffles (7) are arranged at a distance from each other.
2. Tubular shell heat exchanger according to claim 1 , characterized in that the sheets (13) of the baffles (6, 7) are inclined in the same direction relative to a plane perpendicular to the axis of the heat exchanger (1).
3. Tubular shell heat exchanger according to claim 1, characterized in that the sheet (13) of the baffles (6) are inclined relative a plane perpendicular to the axis of the heat exchanger (1) in the opposite direction to the sheets (13) of the baffles (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CZ2020/000055 WO2022135623A1 (en) | 2020-12-22 | 2020-12-22 | Tubular shell heat exchanger with sheet baffles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CZ2020/000055 WO2022135623A1 (en) | 2020-12-22 | 2020-12-22 | Tubular shell heat exchanger with sheet baffles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2022135623A1 true WO2022135623A1 (en) | 2022-06-30 |
Family
ID=74187060
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/CZ2020/000055 WO2022135623A1 (en) | 2020-12-22 | 2020-12-22 | Tubular shell heat exchanger with sheet baffles |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2022135623A1 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1525094A (en) * | 1921-03-05 | 1925-02-03 | Griscom Russell Co | Multivane cooler |
| CN105910462A (en) * | 2016-04-15 | 2016-08-31 | 东南大学 | Baffle plate support method using small inclination angle helical baffle plate to realize large helical lead |
| CN206094996U (en) | 2016-05-30 | 2017-04-12 | 江汉大学 | Shell -and -tube heat exchanger |
| CN109579573A (en) * | 2018-12-07 | 2019-04-05 | 西安交通大学 | A kind of spiral lattice board shell-and-tube heat exchanger |
-
2020
- 2020-12-22 WO PCT/CZ2020/000055 patent/WO2022135623A1/en active Application Filing
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1525094A (en) * | 1921-03-05 | 1925-02-03 | Griscom Russell Co | Multivane cooler |
| CN105910462A (en) * | 2016-04-15 | 2016-08-31 | 东南大学 | Baffle plate support method using small inclination angle helical baffle plate to realize large helical lead |
| CN206094996U (en) | 2016-05-30 | 2017-04-12 | 江汉大学 | Shell -and -tube heat exchanger |
| CN109579573A (en) * | 2018-12-07 | 2019-04-05 | 西安交通大学 | A kind of spiral lattice board shell-and-tube heat exchanger |
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