Asymmetric flow channel detachable plate heat exchanger

Abstract

The present invention belongs to the technical field of partition-type heat exchange, and specifically relates to an asymmetric flow channel detachable plate heat exchanger. The present invention comprises an outer shell, in which two or more groups of plate pairs are arranged in parallel with each other, and the gap between each two adjacent groups of plate pairs and / or the gap between the plate pairs and the inner wall of the outer shell constitutes an external flow channel for the heat exchange medium to flow, and the heat exchange medium to flow enters from the preset working medium inlet at the outer shell and is discharged from the working medium outlet; the plate pair is formed by bonding the plate surfaces of two sub-plate bodies, and each sub-plate body is provided with an "S"-shaped extending guide groove, so that after the sub-plate bodies are bonded, the guide grooves cooperate with each other to form an "S"-shaped internal flow channel for the heat exchange medium to flow; the heat exchange medium enters from the preset medium inlet at the outer shell and is discharged from the medium outlet. The present invention has the advantages of simple and quick cleaning and maintenance, and is suitable for use in working conditions with high viscosity working medium, easy scaling working conditions, and working conditions with a large ratio of the volume flow rates of the cold and hot working mediums.

Description

Technical Field

[0001] The invention belongs to the technical field of partition-type heat exchange, and in particular relates to a plate-type heat exchanger with detachable asymmetric flow channels. Background Art

[0002] Heat exchanger products have been widely used in the fields of petroleum, chemical industry, power, aviation, machinery, etc., mainly used for the occasion of heat exchange between two media. At present, there are many types of heat exchangers at home and abroad, mainly including fixed tube sheet heat exchangers, floating head heat exchangers, U-tube heat exchangers, wound tube heat exchangers, plate heat exchangers and spiral plate heat exchangers. However, in actual use, each type of heat exchanger equipment is often highly targeted in design, and the appropriate heat exchanger product can only be selected according to various factors such as equipment use process requirements and working fluid parameters.

[0003] At present, in the transportation of crude oil on offshore platforms, the loading and unloading of crude oil on large crude oil cargo ships, and the occasions of polymer flooding and oil production, crude oil containing various materials such as polymers, ores, paraffin, etc. has high viscosity due to low temperature, and is often accompanied by crystallization. It has strong adhesion to equipment, which is easy to cause equipment blockage and low heat transfer efficiency of heat exchanger products, causing great inconvenience to oil production and transportation equipment such as pumps, oil production machines, and transportation pipelines. At present, the common operating method for solving the low temperature of crude oil at home and abroad is: using heat exchangers with hot working fluids such as heat transfer oil and high-temperature water to exchange heat with crude oil in a wall-type manner, increase the temperature of crude oil, reduce the viscosity of crude oil, and facilitate mining and long-distance transportation. In other chemical, chemical, and food industries, high-viscosity, easy-to-crystallize liquids, such as molasses, are viscous and semi-flowing objects. In a low-temperature environment, due to its increased viscosity, it will affect transportation. Therefore, in order to reduce the viscosity of molasses and increase the flow rate, electric heating cables can be used to prevent freezing and heat preservation of molasses pipelines during production or short-distance transportation. If it is transported over the ocean, usually a heat exchanger is also needed to heat the molasses during transportation to maintain the temperature of the molasses, prevent crystallization, and facilitate transportation.

[0004] In the above and similar occasions, people expect the heat exchanger to be quickly disassembled and assembled for cleaning; however, traditional heat exchangers are generally inconvenient to disassemble and clean, especially plate heat exchangers, which require the removal of the equipment, the removal of the outer frame, and the cleaning of the heat exchange plates layer by layer, which is extremely time-consuming and labor-intensive, and the maintenance cost is high. In addition, traditional heat exchangers will form flow cross sections between the cold and hot side sub-plates, and the flow cross-sectional areas on the cold and hot sides are often equal. When the volume flow rate of the working fluid on the cold and hot sides is relatively large, the flow velocity on the side of the heat exchange working fluid with a small volume flow rate will be very low, affecting the heat transfer effect, which needs to be solved urgently. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art and provide an asymmetric flow channel detachable plate heat exchanger, which has the advantages of simple and quick cleaning and maintenance; at the same time, the present invention relies on the asymmetric flow channel design to enable relatively pure heat exchange medium to have a larger fluid stroke, and the heat exchange medium to be exchanged has a relatively shorter stroke, which is more conducive to heat exchange, and is therefore more suitable for use in conditions of high viscosity working fluids, easy scaling conditions, and conditions where the volume flow rates of the cold and hot working fluids are relatively large.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A plate heat exchanger with detachable asymmetric flow channel, characterized in that: it includes an outer shell, in which are arranged more than two groups of plate pairs with plate surfaces arranged parallel to each other, the gap between each two adjacent groups of plate pairs and / or the gap between the plate pairs and the inner wall of the outer shell constitutes an outer flow channel for the heat exchange medium to flow, and the heat exchange medium enters from a preset working medium inlet at the outer shell and is discharged from a working medium outlet; the plate pair is formed by bonding the plate surfaces of two sub-plate bodies, and each sub-plate body is provided with an "S"-shaped extending guide groove, so that after the sub-plate bodies are bonded, the guide grooves cooperate with each other to form an "S"-shaped inner flow channel for the heat exchange medium to flow; the heat exchange medium enters from a preset medium inlet at the outer shell and is discharged from a medium outlet.

[0008] Preferably, the outer shell includes a base and a cover installed on the base, and the plate bundle core formed by the plate pair combination is installed in the outer shell; the working fluid inlet, working fluid outlet, medium inlet and medium outlet are all arranged through the base.

[0009] Preferably, the cover body is provided with lifting ears for facilitating lifting.

[0010] Preferably, a shell-side partition for increasing the stroke of the external flow channel is provided in the cover cavity of the cover body, thereby dividing the external flow channel into an inlet channel directly connected to the working fluid inlet and an outlet channel directly connected to the working fluid outlet; the shell-side partition plate surface is parallel to the cover body axis, and the bottom end of the shell-side partition and the upper surface of the base are in contact with each other, and a reserved channel for the working fluid to be heat exchanged to travel is present between the top of the shell-side partition and the top wall of the cover body.

[0011] Preferably, the sub-plate body is formed by stamping.

[0012] Preferably, the abutting areas of the two sub-plate bodies constituting a set of plate pairs are welded to each other.

[0013] The beneficial effects of the present invention are:

[0014] 1) The present invention abandons the many usage problems caused by the traditional simple superposition of plates and the symmetrical arrangement of inner and outer flow channels in the plate body, and instead adopts a pair of plates arranged at intervals, and arranges the inner flow channels inside the plate pair and the outer flow channels outside the plate, finally forming an asymmetric layout of inner and outer flow channels. In this way, on the one hand, the inner flow channel for the flow of high-temperature clean small-flow heat exchange medium is significantly increased through the "S"-shaped layout, so as to achieve a more excellent heat exchange effect; at the same time, high-viscosity, easy-to-scale and even large-flow heat exchange mediums to be exchanged can directly enter and exit through the straight-through outer flow channel; therefore, it is more suitable for use in high-viscosity working medium conditions, easy-to-scale working conditions, and working conditions where the volume flow of cold and hot working mediums is relatively large. On the other hand, since the high-viscosity, easy-to-scale and even large-flow heat exchange medium flows in the straight-through outer flow channel, while the inner flow channel passes relatively pure liquids such as oil or water; therefore, during the operation, only the outer flow channel needs to be cleaned, and when cleaning, only the outer shell needs to be opened to reveal the entire outer flow channel. The straight-through layout of the entire outer flow channel is also easier to flush, and maintenance is obviously extremely convenient and quick, with extremely high cost performance and practicality.

[0015] 2) As a further preferred solution of the above solution, the present invention uses the base and the cover body to form the outer shell. In this way, when the outer flow channel with severe scaling or siltation needs to be cleaned and maintained, the flange connection between the base and the cover body can be directly removed, and then the cover body can be lifted to fully expose the entire outer flow channel, which is extremely convenient for cleaning and maintenance. As for the arrangement of the lifting ears, the purpose is to simplify the lifting process, which will not be repeated here.

[0016] 3) The arrangement of the shell-side partitions serves to extend the stroke of the outer flow channel, so that corresponding addition and deletion operations can be performed according to actual needs. For example, the stroke of the outer flow channel can be appropriately extended if the viscosity is higher, the easier it is to clean, or the larger the flow rate is, and vice versa, the number of shell-side partitions can be appropriately reduced, etc., to enhance the flexibility of use of the present invention.

[0017] 4) Since the guide grooves are directly opened on the sub-plate body, the present invention can directly form the sub-plate body by a one-time stamping method, the manufacturing process can be effectively simplified, and the cost is relatively lower. During actual processing, each plate pair is formed by bonding two sub-plate bodies, and the preset guide grooves on the sub-plate bodies are used to match each other to form an "S"-shaped inner flow channel. Ribs are formed in the area outside the guide grooves of the sub-plate body, and the ribs are connected by welding, which can effectively increase the pressure-bearing capacity of the inner flow channel; practice has proved that the pressure-bearing capacity of the inner flow channel of the present invention is much higher than that of the existing plate heat exchanger, which can effectively ensure the actual working strength of the plate bundle core and even the entire device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is the structural exploded diagram of the outer shell;

[0019] Figure 2 Schematic diagram of the flow direction of the inner channel;

[0020] Figure 3 It is a structural schematic diagram of the plate bundle core;

[0021] Figure 4 It is a partial structural cross-sectional view of the sub-plate body;

[0022] Figure 5 It is a partial structural cross-sectional view of the plate pair;

[0023] Figure 6 It is a schematic diagram of the structure of the shell side partition.

[0024] The actual correspondence between the reference numerals and component names of the present invention is as follows:

[0025] A-Outer flow channel B-Inner flow channel

[0026] 10- plate pair 11- sub-plate body 11a- flow guide groove

[0027] 21- base 22- cover 22a- hanging ear

[0028] 30- Shell side partition DETAILED DESCRIPTION

[0029] For ease of understanding, here we combine Figure 1-6 The specific structure and working mode of the present invention are further described as follows:

[0030] The specific structure of the present invention is as follows Figure 1-6 As shown, its main structure includes an outer shell and a plate bundle core body located inside the outer shell. The "S"-shaped inner flow channel B arranged inside the plate bundle core body constitutes a medium flow channel for the heat exchange medium to pass through; and the straight-through outer flow channel A formed between the plate bundle core body and between the plate bundle core body and the outer shell body constitutes a working medium flow channel for the working medium to be exchanged. In actual design, the working medium to be exchanged enters from the working medium inlet preset at the outer shell and is discharged from the working medium outlet; the heat exchange medium enters from the medium inlet preset at the outer shell and is discharged from the medium outlet.

[0031] in:

[0032] Reference Figure 4-5 As shown, during manufacturing, each two sub-plate bodies 11 can be welded together to form a plate pair 10, and depending on Figure 3 The combination of the parallel plate pairs 10 shown in the figure can form the aforementioned plate bundle core. During processing, the sub-plate body 11 can be directly punched and formed as a whole, and after punching, a depression can be formed on the original flat plate. Figure 4 The guide groove 11a is shown; the guide groove 11a is as shown Figure 2 The "S" type shown is used to allow the heat exchange medium to enter, exit and flow.

[0033] During the design, the length of the sub-plate body 11 is L, the width of the sub-plate body 11 is H, the flow channel spacing is a, the rib width is b, the groove depth is h, the thickness of the sub-plate body 11 is t, and the distance between the long axes of the pipes is d; generally a is 3-5mm, and h is designed according to needs. Two sub-plate bodies 11 of the same type face to face, and a group of plate pairs 10 can be formed by welding the periphery and ribs of the sub-plate body 11; a group of plate pairs 10 forms a complete "S"-shaped internal flow channel B, and the flow cross-sectional area of ​​each group of plate pairs 10 is 2ah, and the medium inlet and medium outlet are both placed on the same side, that is, at the base 21. In this way, the flow cross-section of a group of plate pairs 10, the flow channel length is equivalent to a heat exchange tube folded into an "S" shape, and the heat exchange area is HL. The heat exchange expansion area is obviously much larger than the heat transfer surface area of ​​a heat exchange tube. The ribs are connected by welding to increase the pressure bearing capacity of the internal flow channel, which can make the pressure bearing capacity of the internal flow channel B much higher than that of the existing plate heat exchanger, with significant results.

[0034] Furthermore, multiple groups of plate pairs 10 are welded and connected with two collecting pipes through free lateral expansion, and reinforcing ribs can be arranged around the outside and welded and fixed. During operation, the inner flow channel B of the plate bundle core body carries clean heating medium, and the clean heating medium here is also the aforementioned heat exchange medium; the cold side heated medium carries between the plate pairs 10 and between the plate pairs 10 and the outer shell, and the cold side heated medium here is also the aforementioned heat exchange medium. Let the distance between the plate pairs 10 and the plate pairs 10 be c, and c can be adjusted accordingly according to the fluid characteristics and the flow rate of the working medium. According to the cold side fluid characteristics and the flow rate of the working medium, during the free expansion of the plate pairs 10, the distance between one or several groups of plate pairs 10 and the plate pairs 10 can be increased, so as to be more suitable for large flow cold side working medium, high viscosity working medium and easy-to-clean working medium.

[0035] In addition, the present invention can also adjust the outer flow channel A through the shell side partition 30. Figure 6 It can be seen that the shell-side partition 30 forms a bottom-in and bottom-out flow channel structure. The shell-side flow channel can usually be provided with two, four or six groups of even-numbered flow channels to increase the stroke of the outer flow channel A as appropriate.

[0036] When installing, the outer shell should be Figure 1 The illustrated embodiment is separated into a base 21 and a cover 22 . Figure 1 In the embodiment, the plate bundle core is integrally mounted on the base 21, and the medium inlet, medium outlet, working fluid inlet and working fluid outlet are all arranged at the base 21. The medium inlet and medium outlet penetrate the base 21 and then connect to the inlet and outlet holes of each group of plate pairs 10, so as to connect to the inner flow channel B; the working fluid inlet and working fluid outlet directly penetrate the base 21 and then connect to the outer flow channel A. Figure 2 The hollow arrow is the flow path of the heat exchange medium in the inner flow channel B; Figure 6 The solid arrow in the figure is the flow direction of the working fluid to be heat exchanged in the outer flow channel A.

[0037] Taking the case where the heat exchange medium is the hot side working fluid and the working fluid to be exchanged is the cold side working fluid as an example, through the above design, the inlets and outlets of all the hot and cold side working fluids can be placed at the bottom of the equipment, that is, the base 21. During the disassembly and cleaning process, only the fasteners are removed and the cover body 22 is lifted by the lifting ears 22a, and the outer flow channel A between the plate pairs 10 can be manually or mechanically cleaned and cleared, and the operation is very convenient.

[0038] So far, the cross-sectional area of ​​the inner flow channel B, i.e., the total flow channel of the hot side working medium, is 2Nha, where N is the number of plate pairs 10; the cross-sectional area of ​​the outer flow channel A, i.e., the total flow channel of the cold side working medium, is 2NHc / n, where n is the number of shell passes, and the ratio of the cross-sectional area of ​​the total flow channel of the hot and cold sides is λ=Hc / nha. For example: H=300mm, c=10mm, n=2, h=4mm, a=15mm, and λ=25 is calculated; which is equivalent to the cross-sectional area of ​​the inner flow channel B being 25 times the cross-sectional area of ​​the outer flow channel A, which is very suitable for heat exchange of hot and cold working mediums with a relatively large volume flow rate on the hot and cold sides, and is also very suitable for cleaning of viscous and easy-to-crystallize working mediums.

[0039] Of course, it is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, but also includes the same or similar structures that can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any reference numerals in the claims should not be regarded as limiting the claims involved.

[0040] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0041] The techniques, shapes, and structural parts not described in detail in the present invention are all well-known techniques.

Claims

1. An asymmetric flow channel detachable plate heat exchanger, Features: The invention comprises an outer shell, wherein two or more sets of plate pairs (10) are arranged in parallel with each other, and the gaps between each two adjacent sets of plate pairs (10) and the gaps between the plate pairs (10) and the inner wall of the outer shell form an outer flow channel (A) for the heat exchange medium to flow, and the heat exchange medium enters from a preset working medium inlet at the outer shell and is discharged from a working medium outlet; the plate pair (10) is formed by laminating the plate surfaces of two sub-plate bodies (11), and each sub-plate body (11) is provided with an "S"-shaped extending flow guide groove (11a), so that after the sub-plate bodies (11) are laminating, the flow guide grooves (11a) cooperate with each other to form an "S"-shaped inner flow channel (B) for the heat exchange medium to flow; the heat exchange medium enters from a preset medium inlet at the outer shell and is discharged from a medium outlet; The outer shell comprises a base (21) and a cover (22) mounted on the base (21); a plate bundle core formed by the combination of the plate pairs (10) is mounted in the outer shell; the working fluid inlet, working fluid outlet, medium inlet and medium outlet are all arranged through the base (21); A shell-side partition (30) for increasing the stroke of the external flow channel (A) is arranged in the cover cavity of the cover body (22), thereby dividing the external flow channel (A) into an inlet channel directly connected to the working medium inlet and an outlet channel directly connected to the working medium outlet; the plate surface of the shell-side partition (30) is parallel to the axis of the cover body (22), and the bottom end of the shell-side partition (30) and the upper surface of the base (21) are in contact with each other, and a reserved channel for the working medium to be heat exchanged to travel is present between the top of the shell-side partition (30) and the top wall of the cover body (22).

2. The asymmetric channel detachable plate heat exchanger according to claim 1, Features: The cover body (22) is provided with a lifting lug (22a) for facilitating lifting.

3. The asymmetric channel detachable plate heat exchanger according to claim 1 or 2, Features: The sub-plate body (11) is formed by stamping.

4. The asymmetric channel detachable plate heat exchanger according to claim 3, Features: The mating areas of two sub-plate bodies (11) constituting a set of plate pairs (10) are welded to each other.

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