WO2018019182A1

WO2018019182A1 - Side-flow plate and shell-type heat exchanging plate and multi-flow detachable plate and shell-type heat exchanger

Info

Publication number: WO2018019182A1
Application number: PCT/CN2017/093801
Authority: WO
Inventors: 黄兴存; 俞伟德
Original assignee: 恒丰工程（香港）有限公司
Priority date: 2016-07-28
Filing date: 2017-07-21
Publication date: 2018-02-01
Also published as: CN107664444A; CN107664444B

Abstract

A heat exchanging plate applicable in a plate and shell-type heat exchanger and the plate and shell-type heat exchanger using the heat exchanging plate. The heat exchanging plate is provided with two transverse partitions and, by means of a plate-side flow channel of a plate-side deflector strip (22) on the heat exchanging plate, forms two linked transverse flows or flow areas separated from each other. This heat exchanging plate can be used to construct a single-flow heat exchanger of increased efficiency and a multi-flow plate and shell-type heat exchanger having plate-side connecting pipes arranged on a front-extremity flange cover and a detachable heat-exchanging core. This multi-flow plate and shell-type heat exchanger is convenient to be opened for servicing and mechanical cleaning.

Description

Side-flow plate and shell heat exchanger plate and multi-process removable shell-and-shell heat exchanger

Technical field

The present invention relates to a shell-and-shell heat exchanger, and more particularly to a side-flow shell-and-shell heat exchanger plate having a lateral partition suitable for a shell-and-shell heat exchanger and a multi-process removable shell-and-shell type using the same Heat Exchanger.

Background technique

Shell-and-tube heat exchangers (STHE), plate heat exchangers (PHE), and plate-and-shell heat exchangers (PSHE) are all heat exchanger types well known to those skilled in the art, in which the shell-and-tube heat exchanger is closed. In the shell, the wall surface of the tube bundle serves as a heat exchanger with a heat exchange surface. The shell is mostly cylindrical, and a tube bundle is arranged inside. The two ends of the tube bundle are fixed on the tube sheet, and the two kinds of fluids for heat exchange are respectively Flowing in the tube and shell processes, generally in cross-flow, the heat exchanger is simple in structure and reliable in operation, especially in high temperature and high pressure; the plate heat exchanger is made up of a series of corrugated metals. A high-efficiency heat exchanger in which the plates are stacked, a plurality of heat exchange plates are assembled to form alternating hot and cold flow passages, and the hot and cold fluid exchanges heat through the plates, and the flow is parallel to the heat exchange surface and is mostly Parallel flow or countercurrent flow mode, the heat exchanger has the characteristics of high heat exchange efficiency, small heat loss, compact and light structure, small floor space, convenient installation and cleaning, and long service life.

The plate-and-shell heat exchanger can be regarded as a structural form between the above-mentioned shell-and-tube heat exchanger and the plate heat exchanger, which takes into consideration the advantages of both: 1 the heat transfer surface of the plate, heat transfer Good performance; the hot and cold medium flow channels are alternately arranged inside the heat exchanger, and the generated turbulence and complete counterflow patterns ensure extremely high heat transfer performance between the plates, and the heat transfer coefficient can be several times higher than that of the shell-and-tube heat exchanger. . 2 tight structure Make up, small size. 3 temperature and pressure resistance, the maximum working temperature can reach 800 ° C, the maximum working pressure can reach 6.3 MPa, and the special form can also be applied to higher temperature and pressure. 4 corrugated board surface results in high surface shear stress and is not easy to scale. 5 The plate-and-shell heat exchanger with special end cap flange structure can be used to disassemble the cleaning heat exchange channel. The plate-and-shell heat exchanger is especially suitable for the process where the flow rate of the heat exchange medium on both sides is different. The flexibility of the shell side passage allows the large flow rate to pass through, and the small flow heat exchange medium enters the plate side passage of the heat exchanger. . As described above, the plate-and-shell heat exchanger has become a high-performance heat exchange device widely used in various industrial fields due to the combination of the advantages of the plate and shell-and-tube heat exchangers. The popularity of this heat exchanger is attributed to its many unique and advantageous product attributes, including high heat transfer coefficient, all-welded construction, no or minimal gasket material, suitable for high temperature, high pressure, low temperature and low pressure. Working conditions and a high degree of flexibility that can be tailored to the exact operating conditions.

1A is a schematic structural view showing the working principle of a plate-and-shell heat exchanger of the prior art. As shown in FIG. 1A, a typical plate-and-shell heat exchanger mainly includes: a plate-side fluid (A fluid) inlet and outlet heat exchanger. The nozzles Ai, Ao, the nozzles Bi, Bo for the shell side fluid (B fluid) entering and leaving the heat exchanger, the heat exchanger housing C, and the heat exchange core D located in the heat exchanger housing C, the replacement The hot core D is composed of a series of successively assembled cold-formed circular heat exchange plates. Furthermore, as shown in the physical diagram of the heat exchanger plate on the right side of FIG. 1A, two circular holes F are opened in each heat exchange plate as the inlet and outlet of the plate side fluid, and the two adjacent heat exchange plates are tightly connected along the periphery. The ground is welded together to form a plate pair E, the plate pair E forms a flow path of the plate side fluid, and the two plate pairs E are welded together along the periphery of the circular hole F to form a flow path of the shell side fluid, which is completely welded. The cylindrical heat exchange core D is finally installed in the heat exchanger casing C to form a shell side flow space. The structural details of a circular heat exchanger plate for a conventional plate-and-shell heat exchanger are more clearly shown in Fig. 1B, as shown in Fig. 1B, at the upper and lower ends of the heat exchanger plate of the conventional plate-and-shell heat exchanger, respectively. Round inlet 5 and rounded out for fluid on the side of the plate Port 6, and different forms of corrugations 2 formed by cold pressing are provided on the surface of the heat exchange plate to enhance flow turbulence and heat transfer coefficient. As described above, the two heat exchange plates are welded together along the periphery 3 to form a plate pair E as shown in FIG. 1A, and the A fluid flows in the pair (ie, the plate side flow path is formed); the adjacent plate pair E The welds are welded together along the round hole edges of the circular inlet and

outlet

5, 6 to achieve the seal between the plate side flow passage and the shell side flow passage, and the B fluid flows between the pair of plates in the casing (that is, the shell is formed). Side flow channel).

Although not shown in the above schematic, front and rear end caps are respectively provided at the front and rear ends of the shell-and-tube heat exchanger housing, which are welded to the heat exchanger housing to form a bearing and sealing ability. If it is necessary to have the ability to open to clean the heat exchange passage, the front end cover can be designed as a flange structure, and the front end cover and the heat exchange core body can be welded together, and the heat exchanger shell is connected by a flange joint. Together. When the heat exchange passage needs to be cleaned, the front end cover and the heat exchange core body can be integrally withdrawn from the casing. In addition, there must be sufficient clearance between the heat exchange core and the housing to ensure the axial distribution of the shell side fluid. In order to allow almost all shell side fluid to flow through the heat exchange core, it must be in the heat exchange core and A flow guiding mechanism is installed between the inner walls of the casing to minimize the short circuit between the heat exchange core and the casing. For a technical solution specifically addressing the problems of the flow-conducting seal, see U.S. Patent No. 84,537,721 B2.

The same as the rectangular heat exchanger plate of the plate heat exchanger, the circular heat exchanger plate constituting the heat exchange core of the plate-and-shell heat exchanger greatly affects the overall performance and working condition of the heat exchanger, and generally the plate and shell The performance of the heat exchanger can be adjusted and optimized by the following parameters: 1) heat exchanger plate pattern; 2) heat exchanger plate size (diameter); 3) plate hole size and Center hole spacing; 4) number of plates; and 5) number of processes for each of the hot and cold fluids. It should be particularly noted that the processes and flow paths in the technical field belong to technical terms that are related to each other but have different meanings. Taking a plate heat exchanger as an example, the process refers to a set of parallel flow paths of a medium in the same flow direction in the plate heat exchanger, and the flow path refers to a medium flow channel composed of two adjacent plates in the plate heat exchanger. In the plate-and-shell heat exchanger, the same concept exists, and considering the structural factors, the process and the flow path are further divided into a plate side and a shell side. According to the above definition, it can be seen that the plate-and-shell heat exchanger is a single-flow design or a single-shell single-plate design.

In theory, the need to increase the number of processes can meet the needs of any high-efficiency conditions while other parameters remain the same, especially for industrial applications with low or small temperature differences, sometimes requiring multiple process designs (multiple) Passes design). Figure 2 shows the working principle of a three-flow plate-and-shell heat exchanger. As shown, the plate-and-shell heat exchanger is composed of a casing 10, a heat exchange core 11, a front end cover 18 and a rear end cover 19. composition. The cold fluid (shell side fluid, A fluid) 17 enters the heat exchanger from the nozzle 12 at the lower end of the shell side, the first flow flows upward, the second flow flows downward, the third flow flows upward again, and then the upper end from the shell side The nozzle 13 exits the heat exchanger. The hot fluid (plate side fluid, B fluid) 16 flows from the nozzle 14 located at the rear end cover 19, and flows out of the heat exchanger from the nozzle 15 located at the front end cover 18 after three passes. As shown, the hot and cold fluids flow in opposite directions to each other in each process to form a countercurrent to maximize heat transfer potential.

Despite the numerous advantages, the existing conventional shell-and-shell heat exchangers still have the following series of technical problems and inconveniences in use:

1) As shown in Fig. 1B, the inherent geometric characteristics of the circular heat exchanger plate, compared with the rectangular heat exchanger plate of the plate heat exchanger, the flow path length and width of the plate side heat exchanger It is relatively low, about 1.0. Therefore, for industrial applications with relatively small temperature differences, the single-flow heat exchanger plate design cannot effectively transfer heat, and often cannot achieve thermal optimization, and the heat exchange area required for the same working condition is higher than that of the detachable plate heat exchanger. Thus, the cost of the heat exchanger is significantly increased.

2) Also derived from the inherent geometrical characteristics of the circular heat exchanger plates, the flow of the plate side fluid between the inlet and outlet is inherently non-uniform. The fluid flow 7 near the central region is the shortest and the flow rate is the largest; the fluid flow 8 near the peripheral region is the longest and the flow rate is the smallest, and this flow unevenness affects the overall heat transfer performance. It is disclosed in the international application application WO 2012159882 A1 that by attempting to reduce the unevenness by introducing a baffle between the inlet and outlet, this does not fundamentally solve the circular change described in 1). The inherent weakness of the hot plate process is short.

3) For applications with high heat transfer efficiency requirements, the only practical solution to solve the short process is to use a multi-process design. A prior art method of implementing a multi-flow plate and shell heat exchanger is by dividing the heat exchange core into a plurality of groups. A baffle or baffle is installed between each of the two groups to force the plate side fluid to change the flow direction. At the same time, it is also necessary to install a baffle or a baffle at the corresponding position on the shell side to ensure that the flow between the plate side and the shell side is maintained in a countercurrent state. However, as shown in FIG. 2, the multi-flow design of the plate-and-shell heat exchanger always requires the connection of the connecting pipe 14 on the rear end cover 19, but due to the pressure and sealing reasons, the plate-side connecting pipe must be welded to the heat exchange core at the same time. 11 and the rear end cover 19 to achieve a complete seal between the heat exchange core 11 and the housing 10. In this case, the front and rear end caps of the multi-flow plate and shell heat exchanger must be welded to the housing, so this multi-flow plate and shell heat exchanger cannot be opened for mechanical cleaning, only for chemistry. Cleaning. For this reason, multi-flow plate and shell heat exchangers are generally only suitable for industrial applications where both sides of the fluid are clean.

Summary of the invention

The object of the present invention is to solve the above-mentioned many technical problems existing in the prior art, in particular to solve the two main disadvantages of the above-mentioned plate-and-shell heat exchanger: 1) the single-plate process is too short, thus reducing the overall heat transfer Capability; 2) The plate-and-shell heat exchanger under multi-process design cannot be opened, so mechanical cleaning is not possible.

According to a first aspect of the present invention, a side flow heat exchange plate for a plate-and-shell heat exchanger is provided, and the side flow heat exchange plate forms two flow paths on a plate side thereof by means of a plate side baffle a lateral partition, wherein the length of the plate side baffle is less than a radial length of the heat exchanger plate to allow the plate side fluid to flow between two lateral sections that are in communication at one end, the plate side fluid in and out of the circular hole They are respectively disposed on both sides of the other end where the two lateral partitions are not connected.

Preferably, in the side flow heat exchange plate according to the above first technical solution, the side flow heat exchange plate forms two lateral sections on the shell side flow path by means of the shell side baffle, wherein the shell side The length of the baffle is equal to the radial length of the heat exchanger plate to achieve a shell side baffle in which the shell side fluid and the plate side fluid are in a countercurrent state.

According to a second aspect of the present invention, there is provided an isolation zone heat exchange plate for a plate-and-shell heat exchanger, wherein the isolation zone heat exchanger plate forms two flow paths on a plate side thereof by means of a plate side baffle a lateral partition, wherein the length of the plate side baffle is equal to the radial length of the heat exchange plate, thereby forming two mutually separated lateral partitions on the plate side flow path, and respectively separated from the two A pair of upper and lower ends of the lateral partition are provided with a pair of inlet and outlet holes for the fluid on the side of the plate.

Preferably, in the isolating zone heat exchange plate according to the second technical solution, the isolating zone heat exchanger plate forms two lateral zones on the shell side flow path by means of the shell side baffle, wherein the shell side The length of the baffle is equal to the radial length of the heat exchanger plate to achieve a shell side baffle in which the shell side fluid and the plate side fluid are in a countercurrent state.

Preferably, in the above technical solution, the heat exchange plate is circular or elliptical.

Preferably, in the above technical solution, the heat exchange plate may be subjected to changes in geometric characteristics to obtain different thermal performance, and the heat exchange plates having different geometric features may be mixed and disposed in the same heat exchange core.

Preferably, in the above technical solution, the geometric features include a smooth surface, a V-shaped fish wave, a circular or irregular pit, a stud, and other structures for enhancing heat exchange.

According to a third aspect of the present invention, there is provided a plate-and-shell heat exchanger comprising a front and rear end cover, a casing and a heat exchange core, and a plurality of side flow heat exchanger plates according to the first technical solution described above are The inlet and outlet holes are alternately welded together to form the heat exchange core body in which the plate side flow path and the shell side flow path alternate with each other.

According to a fourth aspect of the present invention, a multi-flow plate and shell heat exchanger comprising a front and rear end cover, a casing and a heat exchange core body, and a plurality of side flow heat exchanger plates according to the first technical solution are provided The peripheral and the inlet and outlet holes are alternately welded together to form a heat exchange core portion of the two processes abutting the rear end cover, and a plurality of the heat exchange plates of the isolation zone according to the second technical solution are alternately arranged along the periphery and the round holes. Solder together to form a heat exchange core portion of all other processes except the two processes immediately adjacent to the back end cover.

Preferably, in the multi-flow plate and shell heat exchanger according to the above technical solution, the side flow heat exchanger plate is used to complete the flow direction rotation in the longitudinal direction, so that there is no need to provide a plate side joint on the rear end cover. And the heat exchange core can be detached from the housing.

Preferably, in the plate-and-shell heat exchanger according to the above technical solution, the plate side flow path and the shell side flow path are formed by planar contact between adjacent heat exchange plates, and the shell side conducts and baffles No isolation is required for the isolation mechanism.

Preferably, in the plate and shell heat exchanger according to the above technical solution, the shell side flow guiding, baffling and isolating mechanism may be partially or completely replaced by a welded structure or other sealing structure.

Preferably, in the plate-and-shell heat exchanger according to the above technical solution, the relative flow direction between the adjacent heat exchange channels can be set by the effective arrangement of the baffles and the shell side baffles on the heat exchanger plates. Complete reverse flow, complete co-current flow, reverse co-directional mixed flow or cross flow to achieve thermal optimization under different application conditions.

According to the above technical solution of the present invention, a structure and a design of a novel heat exchanger plate for a plate-and-shell heat exchanger are disclosed, and a heat exchange efficiency is higher, and the plate side joints are all disposed at the front end flange. A multi-flow plate and shell heat exchanger that is covered for easy maintenance/cleaning. The features, technical effects, and other advantages of the present invention will become apparent from the accompanying drawings.

DRAWINGS

The invention will now be described by way of example with reference to the accompanying drawings in which:

1A is a partial cross-sectional view showing the operation principle of a conventional single-flow plate-and-shell heat exchanger, and also shows a physical diagram of a circular heat exchange plate for a conventional plate-and-shell heat exchanger;

Figure 1B shows structural details of a circular heat exchanger plate for a conventional plate and shell heat exchanger;

2 is a schematic view showing the working principle and flow chart of a conventional three-flow plate and shell heat exchanger;

3 is a schematic view showing the structure and working principle of a side flow heat exchange plate having a lateral partition as an example of a flow path of a plate side fluid according to an embodiment of the present invention;

4 is a schematic view showing the structure and working principle of a side flow heat exchange plate having a lateral partition as an example of a flow path of a shell side fluid according to an embodiment of the present invention;

5 is a simplified assembly and flow diagram of a plate-and-shell heat exchanger using a side flow heat exchanger according to an embodiment of the present invention;

6 is a schematic view showing the structure and working principle of an isolated heat exchange plate having a laterally isolated partition, taking a flow path of a plate side fluid as an example, according to a modification of the present invention;

7 is a schematic view showing the structure and working principle of an isolated heat exchange plate having a laterally isolated partition, taking a flow path of a shell side fluid as an example, according to a modification of the present invention;

Figure 8 is a simplified assembly and flow diagram of a multi-flow plate and shell heat exchanger with a heat exchange core detachable in accordance with a variation of the present invention.

detailed description

Hereinafter, the technical contents, structural features, and technical objects and technical effects achieved by the preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

First of all, the present invention overcomes the following technical limitations with respect to a circular heat exchanger plate of a conventional plate-and-shell heat exchanger: taking the plate side flow as an example, the plate side fluid flows unidirectionally on a circular heat exchange plate, and a single heat exchanger plate The upper side of the plate is relatively short, and the flow of the plate side fluid between the inlet and outlet of the circular heat exchange plate is uneven, which affects the overall heat exchange capacity. Secondly, the present invention also overcomes the following technical prejudice regarding conventional multi-flow plate-and-shell heat exchangers: a multi-flow plate-and-shell heat exchanger requires an interface at the front and rear end caps to provide a plate-side fluid connection and its connection, due to this The front and rear end caps of the plate and shell heat exchanger must be welded to the heat exchanger housing so that they cannot be opened for mechanical cleaning and can only be chemically cleaned. The above technical limitations and prejudice have appeared in a large amount of prior art materials for introducing a shell-and-shell heat exchanger, and the inventors of the present invention fundamentally subvert this point by the inventive technical solution, which is to change the conventional circular shape. The hot plate is divided into two lateral sections, and two flow sections that are connected to each other or isolated from each other are formed on the board side and the shell side by a special marking design. The structural details and working principle are described below.

In a conventional single-flow plate and shell heat exchanger, since the plate side flow is too short, the overall heat exchange capacity is reduced. According to a preferred embodiment of the present invention, a key component that helps solve this problem is to have two lateral zones and The circular heat exchanger plate of the inlet and outlet of the plate side fluid is arranged to the circular heat exchange plate at the same end. This special heat exchange plate can be called a lateral flow heat exchanger plate (Lateral pass plate), and its detailed working principle is combined with FIG. Figure 5 is expanded.

3 is a schematic view showing the operation principle of a side flow heat exchange plate having a lateral partition as an example of a flow path of a plate side fluid according to an embodiment of the present invention; FIG. 4 is a flow path of a shell side fluid according to an embodiment of the present invention. Schematic diagram of the working principle of a lateral flow heat exchanger plate having a lateral partition; FIG. 5 is a simplified assembly and flow diagram of a single-flow shell-and-shell heat exchanger using a side flow heat exchanger plate according to an embodiment of the present invention. The intermediate plate side baffle 22 shown in FIG. 3 is formed by two flat lines formed by pressing on two adjacent circular heat exchange plates, so that welding is not required, and the pressure between the plates after assembly of the heat exchange core is not required. The required seal can be ensured. Also shown in Fig. 3 is the flow trajectory of the plate side fluid having the side flow heat exchanger plates with two communicating lateral zones. First, the plate side fluid flows in via the lower right inlet circular hole 20, and the intermediate plate side baffles 22 It is possible to prevent the plate side fluid from flowing directly to the lower left exit circular hole 21, and to guide the plate side fluid to flow toward the top of the heat exchange plate via the in-plate flow path in the direction indicated by the arrow 23. Secondly, since the length of the plate side baffle 22 is smaller than the diameter of the circular heat exchange plate, an opening 24 is left at the top of the heat exchange plate so that the plate side fluid can be divided from the right side. The zone flows laterally to the left partition. Then, the plate side fluid is guided to flow further downward through the in-plate flow path in the direction indicated by the arrow 25, and finally flows out from the lower left exit circular hole 21. This lateral flow design doubles the flow distance on the same circular heat exchanger plate, reducing the flow path width and flow cross-sectional area by a factor of about twice, which allows the aspect ratio of the flow path on a circular plate of the same diameter. The increase of about 1 to about 4, so the flow rate and heat transfer coefficient under the same flow rate will be significantly improved, and the heat transfer capacity under a small temperature difference will be significantly improved. At the same time, the flow non-uniformity of the plate side fluid is significantly improved compared to the conventional circular heat exchange plate shown in Fig. 1B.

In the plate-and-shell heat exchanger, the flow path of the shell side fluid is formed by two adjacent pairs of plates, and the intermediate side baffle 28 shown in FIG. 4 is directly opposed by the adjacent two plates. On the two heat exchange plates, two straight lines protruding toward the edge of the shell are in contact with each other. Also shown in Figure 4 is the flow path of the shell side fluid of the side flow heat exchanger plates having two lateral zones, it being noted that the position of the shell side inlet and

outlet connections

12, 13 on the heat exchanger casing is correspondingly Adjustments are made, and unlike the plate side baffles 22, the shell side baffles 28 extend to the entire disc diameter. First, the shell side fluid flows from the shell side inlet nozzle 12 into the heat exchanger and into the gap distribution area 30 between the housing 10 and the heat exchange core 11, one side of the distribution area 30 is sealed by the deflector 31, and the other side is bottomed. The baffle 29 is blocked. Therefore, the shell side fluid flows upward through the interplate flow path in the direction indicated by the arrow 32 and enters the top distribution area 33. Next, the shell side fluid flows from the left side partition to the right side partition here, and further flows downward through the interplate flow path in the direction indicated by the arrow 34. Finally, the shell side fluid enters the gap distribution area 35 between the housing 10 and the heat exchange core 11 and flows out from the shell side outlet nozzle 13 under the common restriction of the right side deflector 31 and the bottom baffle 29. Heater. Since the fluid flow area of the shell side fluid and the plate side fluid are substantially the same, the flow direction is exactly opposite, so that a higher degree of pure countercurrent state can be formed, achieving maximum heat transfer potential.

A complete single-flow plate and shell heat exchanger employing the side flow heat exchanger plates shown in Figures 3 and 4 is shown in Figure 5. As shown in FIG. 5, a single-flow plate and shell heat exchanger according to an embodiment of the present invention includes a housing 10, a front end cover 18, a rear end cover 19, and a series of side flow heat exchanger plates 56 assembled in accordance with an embodiment of the present invention. The heat exchange core body, wherein the baffle plate 29 is located at the bottom of the heat exchange core. The plate side fluid enters the heat exchanger from the inlet nozzle 14 disposed on the front end cover 18, and flows out of the heat exchanger from the outlet nozzle 15 disposed on the front end cover 18, and the shell side fluid flows into the heat exchanger from the shell side connection pipe 12 and The heat exchanger is discharged from the outlet nozzle 13. The configuration shown in Figure 5 is substantially identical to a plate side dual flow heat exchanger, but no header is provided on the rear end cover 19.

It should be particularly noted that the above-mentioned side flow heat exchanger plates can also be disposed in a multi-flow plate and shell heat exchanger of any number of processes using the conventional design shown in FIG. 2, and the conventional heat exchange shown in FIG. 1B is configured. Compared with the multi-flow plate and shell heat exchanger of the same number of plates, the side flow heat exchanger plate of the embodiment of the invention doubles the thermal flow length, in other words, the flow of the plate side fluid is doubled. The aspect ratio of the runner is approximately three times greater. In addition, the board design according to the embodiment of the present invention can be used in combination with the conventional shell side design, and is not limited to the necessity of simultaneously adopting the board design according to FIG. 3 and the shell design according to FIG. 4, which is similar to the tube case. In the case of multi-tube and multi-shell processes, the cost of retrofitting conventional shell-and-shell heat exchangers can be saved to some extent. In summary, the side flow heat exchanger plate according to the embodiment of the present invention ideally solves the problem that the plate side flow is too short and the flow side non-uniformity of the plate side is caused in the conventional plate and shell heat exchanger. problem.

Furthermore, the above-described side flow heat exchanger plate according to an embodiment of the present invention can be extended to another important flow arrangement modification, so that the multi-flow plate and shell heat exchanger manufactured according to the configuration of the modification of the present invention does not Need to set any nozzle on the back end cover, thus making multi-flow plate-shell heat transfer The heat exchange core of the device can also be extracted from the housing for mechanical cleaning, which fundamentally overcomes the technical bias in the prior art, and the detailed working principle of the modification is explained in conjunction with FIGS. 6-8.

6 is a schematic view showing the operation principle of an isolating region heat exchanger plate having a laterally isolated partition, exemplified by a flow path of a plate side fluid according to a modification of the present invention; and FIG. 7 is a flow path of a shell side fluid according to a modification of the present invention. FIG. 8 is a schematic view showing the simplified assembly and flow diagram of a detachable multi-flow plate-and-shell heat exchanger with a heat exchange core according to a modification of the present invention. Fig. 6 shows the structural design and working principle of a circular heat exchange plate according to a modification. The heat exchange plate shown in Fig. 6 has two differences from the side flow heat exchange plate shown in Fig. 3: 1) plate side baffle The strip is increased to the length of the entire diameter, and the plate surface is divided into two left and right isolation regions; 2) in each of the isolated regions, there are a pair of plate side fluid inlet and outlet round holes at the upper and lower ends, this special variant heat exchange The plate may be referred to as an isolation zone heat exchanger plate, or simply as an isolated partition plate.

Specifically, the plate side baffles 28, 61 shown in FIG. 6 are formed by two flat lines formed by pressing on two adjacent circular heat exchange plates, so that welding is not required, and the heat exchange core is assembled. The pressure between the plates ensures the required seal. It should be noted that the above two plate side flow bars 28, 61 function to isolate the plate side fluids in different processes, and thus can be regarded as a central plate side baffle as a whole. Also shown in FIG. 6 is the flow trajectory of the plate side fluid in the left and right laterally isolated partitions of the heat exchanger plate in the isolation zone. In the right side isolation zone, the plate side fluid flows in through the inlet circular hole 20 and flows directly to the corresponding outlet. The circular hole 64 proceeds to the next flow, and in the left isolation partition, the plate side fluid from the previous flow flows in reverse through the inlet circular hole 63 and flows directly to the corresponding outlet circular hole 21.

As described above, in the plate-and-shell heat exchanger, the flow path of the shell side fluid is formed by the adjacent two plate pairs, and the two shell side baffles 28, 61 shown in Fig. 7 are composed of two adjacent ones. Two straight lines on the two heat exchange plates directly opposite to each other in the pair of plates are formed in contact with each other. It should be noted that the two shell side baffles extend the same as the plate side baffles to the entire disc diameter, and they can also be considered as a central shell side baffle as a whole. Also shown in Fig. 7 is the flow path of the shell side fluid in the left and right laterally isolated partitions using the heat exchanger plates of the isolated zone, and in the left side isolation partition, the inlet 12 from the shell side inlets flows into the shell of the heat exchanger. The side fluid enters the gap distribution zone 30 between the casing 10 and the heat exchange core 11, and one side of the distribution zone 30 is sealed by the baffle 31 and the other side is blocked by the bottom baffle 29. Therefore, the shell side fluid flows upward through the interplate flow path in the direction indicated by the arrow 32 and enters the top distribution area 33. Since the right side of the top distribution zone 33 is blocked by the top baffle 67, the shell side fluid can only flow in the axial/longitudinal flow to the next flow. In the right side partition, the shell side fluid from the previous flow flows downward through the interplate flow path in the direction indicated by arrow 34 under the common restriction of the top baffle 67 and the right baffle 31. Then, the shell side fluid enters the gap distribution area 35 between the housing 10 and the heat exchange core 11 and is finally discharged from the shell side outlet nozzle 13 under the common restriction of the right side deflector 31 and the bottom baffle 29. Heat Exchanger. Similarly, since the fluid flow area of the shell side fluid and the plate side fluid are substantially the same, the flow direction is exactly opposite, so that a higher degree of pure countercurrent state can be formed, achieving maximum heat transfer potential. In addition, through the effective arrangement of the baffles on the heat exchanger plates and the shell side baffles, the relative flow directions between adjacent heat exchange channels can be set to completely reverse flow, complete cocurrent flow, reverse codirectional mixed flow or Cross flow to achieve thermal optimization under different application conditions.

It should be noted that the flow directions of the plate side fluid and the shell side fluid in a certain process are shown in FIG. 6 and FIG. 7, and the flow direction of the hot and cold fluid changes in the adjacent process. For the personnel, it is not difficult to understand the fluid on the side of the plate and the fluid on the shell side after the process changes. The flow situation, so this article will be explained slightly. In addition, the board design according to the modification of the present invention can also be used in combination with a conventional shell design, and is not limited to the necessity of simultaneously adopting the board design according to FIG. 7 and the shell design according to FIG. 7, which can be to some extent. The cost of retrofitting conventional shell-and-shell heat exchangers is saved.

By using the side-flow heat exchanger plate isolation zone heat exchanger plates described above, a higher number of processes (eg, 4, 6, 8, 10, and any even number of processes) can be achieved to meet the requirements of the operating conditions. Since each heat exchanger plate has two processes, if the number of heat exchanger plates is used as a reference, the number of processes that can be realized can actually be any value, and there is no limitation of the even process, and the plate side takes over. A multi-flow plate and shell heat exchanger with a detachable heat exchange core disposed on the front end cap. In this high-flow plate and shell heat exchanger, the side flow heat exchanger plates are used in the two processes on the side of the rear end cover, and the other heat exchanger plates are used in the remaining processes. In fact, in this multi-process design, the side flow heat exchanger plate is designed to allow the hot and cold fluid to complete a 180 degree turn before reaching the rear end cover to avoid any plate side joints on the rear end cover.

8 shows the structure and flow principle of a six-flow plate and shell heat exchanger according to a modification of the present invention. As shown in FIG. 8, the six-flow plate and shell heat exchanger includes a front end cover 18, a rear end cover 19, and A heat exchange core assembled from a set of side flow heat exchange plates 56 and two sets of isolation zone heat exchange plates 65, wherein bottom baffles 29 and top baffles 67 are respectively located at the bottom and top of the heat exchange core. The plate side fluid enters the heat exchanger from the inlet nozzle 14 disposed on the front end cover 18, and flows out of the heat exchanger from the outlet nozzle 15 disposed on the front end cover 18, and the shell side fluid flows into the heat exchanger from the shell side connection pipe 12 and The heat exchanger is discharged from the outlet nozzle 13. The following is an example of the complete flow path of the fluid on the side of the plate to illustrate the working process of the six-flow detachable shell-and-shell heat exchanger, and the fluid on the side of the plate enters the heat exchanger from the inlet nozzle 14 on the front end cover 18, the first process and The second process is completed in different isolation zone heat exchanger plates, The first process flows upwards, and the second process flows downwards. Then, the third process and the fourth process are completed on the same side process heat exchanger plate, wherein the third process flows upwards, the fourth process flows downwards; finally, the fifth process and The sixth process is completed in the isolation zone heat exchanger plates corresponding to the first process and the second process, respectively, wherein the fifth process flows upward, the sixth flow flows downward, and finally the plate side fluid flows from the outlet nozzle 14 located on the front end cover 18. Flow out of the heat exchanger. The flow path of the shell side fluid is exactly related to the flow path of the above-mentioned plate side fluid, and it is not difficult for those skilled in the art to understand the working process thereof in conjunction with FIG. 7, and thus the description is omitted herein. As can be seen from Fig. 8, the side flow heat exchanger plates are used in the third and fourth processes on the side of the rear end cover, and the isolation zone heat exchanger plates are used in other processes, in this variant multi-flow design. The side flow heat exchanger plate is actually used to complete the flow direction adjustment (U-Turn) in the longitudinal direction, so that the inlet and outlet nozzles of the plate side fluid are all installed on the front end cover, so there is no need to set on the side of the rear end cover. Take any side of the board.

The plate-and-shell heat exchanger plate designed according to the embodiment and the modification of the present invention and the plate-shell heat exchanger configured according to the present invention have the following series of advantages compared with the conventional design structure:

- Solved the problem that the single-plate flow of the circular plate-and-shell heat exchanger plate is short: the plate-and-shell heat exchanger plate designed according to the present invention reduces the circular flow path into two lateral zones by a special baffle bar, thereby reducing The flow cross-sectional area increases the flow length of the plate side flow such that the aspect ratio of the flow path increases from about 1 to about 4 on a circular plate of the same diameter.

-- Realization of detachability of heat exchanger core with multi-process structure: detachability of heat exchange core of multi-flow plate-and-shell heat exchanger can be realized by mixing side process heat exchanger plates and heat exchanger plates in isolation zone Because there is no need to set any board side connectors on the rear end cover. This configuration allows the shell side to be opened for mechanical cleaning, allowing multi-flow plate and shell heat exchangers to be used in industrial applications where dirt may be present on one side.

- Overall more efficient heat exchanger: Due to the above various advantages, according to the present invention, a single-flow or multi-flow plate-and-shell heat exchanger with higher heat exchange efficiency, lower cost and easy maintenance can be designed to meet high temperature. The need for high efficiency and maintainable shell and tube heat exchangers in high pressure, low temperature and low pressure applications.

According to the working condition parameters and the required number of flows, the plate-and-shell heat exchanger plates described in the present invention have the following two typical application examples. These two applications require two sets of inlet and outlet and baffle shapes.

[First application example]

In the first application, only the side flow heat exchanger plates are used, which are suitable for any number of applications.

- Pressing a side flow heat exchange plate according to an embodiment of the invention.

- A plurality of side flow heat exchange plates are alternately welded together along the periphery and the inlet and outlet round holes to form a heat exchange core body in which the hot and cold flow paths alternate with each other. If it is a multi-process, you need to use a baffle with a blind hole in the process change position. The baffle and the other heat exchanger plates are from the same mold, the only difference is that one of the circular holes is not punched out in order to change the flow direction of the fluid on the side of the plate.

- For each process, install a baffle on the top or bottom of the heat exchange core. If it is a single process, simply install the baffle at the bottom.

- Welding the heat exchange core, the front and rear end caps, the casing, the plate edge joint, and the shell side joint to form an integral heat exchanger.

- If it is a single process, both sides of the board are covered at the front end; if it is a multi-flow, one of the board side is at the front end cover, and the other side of the board is connected to the rear end cover.

[Second application example]

In the second application example, the side flow heat exchanger plate and the isolating zone heat exchanger plate are combined to realize the detachable multi-flow plate and shell heat exchanger of the heat exchange core body (for example, 4, 6, 8, 10 and any even flow) The number of achievable processes can be virtually any value based on each heat exchanger plate, and there is no such limitation of even processes.

- Two types of heat exchange plates are respectively pressed according to embodiments and modifications of the present invention. Wherein, the first type is an isolating zone heat exchange plate according to a modification of the present invention, and the second type is a side flow heat exchanger plate according to an embodiment of the present invention, and the heat exchanger plate of this type is only applicable to the rear end cover. In the process.

- A plurality of isolation zone heat exchange plates are alternately welded together along the perimeter and the round holes to form a heat exchange core portion in all other processes except for the two processes adjacent to the back end cover.

- A plurality of side flow heat exchange plates are alternately welded together along the periphery and the round holes to form a heat exchange core portion of the two processes adjacent to the rear end cover.

- Welding the heat exchange core, the flanged front end cover, the heat exchange core and the plate side joints together to form a core assembly.

- Welding the circular housing, the rear pressure plate, the shell side mating flange and the shell side joint together to form a housing assembly.

- The core assembly and the housing assembly are clamped together by a plurality of bolts arranged around the periphery of the flange to complete the integral heat exchanger with an annular gasket between the flanges. In this multi-flow plate and shell heat exchanger, the two nozzles on the side of the plate are on the front end cover. It can therefore be opened for mechanical cleaning.

In the above embodiments and modifications, the shell-side flow (shell side) and the plate-side flow (plate length) of the plate-and-shell heat exchanger according to the technical solution of the present invention are equal in number but opposite in direction, thereby realizing the plate side. The pure countercurrent state of the fluid and shell side fluids, and maximizes the heat exchange efficiency between the hot and cold fluids. However, it is particularly emphasized that in the plate and shell heat exchanger of the invention, the plate-pass design according to the invention and the shell-side design according to the prior art can be used in combination, in other words, depending on the specific industrial application, only according to the invention The technical solution to modify the board side process, which has a certain cost advantage especially in the transformation of the traditional plate and shell heat exchanger.

It is to be understood that the various embodiments of the present invention have been described and illustrated, and the invention is not limited thereto, but may be embodied in other ways within the scope of the subject matter defined by the appended claims. For example, for industrial applications (evaporators, condensers) in which a phase change occurs on one side of the fluid, a fluid that does not undergo a phase change can be arranged on the side of the side flow heat exchanger plate of the present invention to increase the single phase heat transfer coefficient. And arrange the phase change fluid to the shell side. However, there is no need to set a baffle on the shell side. This enables efficient design of the Part 1 process to the 2 process. Furthermore, for example, for industrial applications (evaporators, condensers) where a phase change occurs on one or both sides of the fluid and there is a need for overheating or undercooling, the fluid in which the phase change occurs may also be arranged in the side flow described in the present invention. The plate side of the heat exchanger plate. One side partition of the same heat exchanger plate is used for evaporation or condensation, and the other side partition can be used for overheating or undercooling, which enables efficient design of the Part 1 flow to 2 process. Also, for example, the outer casing, the end plate, and the heat exchange plate may have an elliptical shape or the like. Such an elliptical shape is included in the term "circular" in the context of this specification. The heat exchanger can also have additional flow passages, and the plurality of end plates and outer casing can thus have more than one respective inlet and outlet port.

The above disclosure is only the preferred embodiment of the present invention, and of course, the scope of the present invention is not limited thereto, and thus the equivalent change according to the scope of the present invention remains the present invention. The scope covered by Ming. It is to be understood that the above description is intended to be illustrative rather than limiting. For example, the above embodiments (and/or aspects thereof) can be used in combination with each other. In addition, many modifications may be made to adapt a particular situation or material to the invention without departing from the scope of the invention. Many other embodiments and modifications within the scope and spirit of the claims will be apparent to those skilled in the art.

Claims

A side-flow plate-and-shell heat exchanger plate as a side flow heat exchanger plate for a plate-and-shell heat exchanger, characterized in that: the side flow heat exchanger plate flows on the side of the plate by means of a plate side baffle The track forms two lateral sections, wherein the length of the plate side baffle is less than the radial length of the heat exchanger plate to allow the plate side fluid to flow between two lateral sections that are in communication at one end, the plate side fluid The entry and exit circular holes are respectively disposed on both sides of the other end where the two lateral partitions are not connected.
The side-flow plate-and-shell heat exchanger plate according to claim 1, wherein the side flow heat exchanger plates are supported by a single shell side baffle, a bottom baffle, and left and right baffles. The shell side flow passages form two lateral sections that are in communication, and a shell side baffle of the shell side fluid and the sheet side fluid in a countercurrent state is realized.
A side-flow plate-and-shell heat exchanger plate as an isolation zone heat exchanger plate for a plate-and-shell heat exchanger, characterized in that: the heat exchanger plate of the isolation zone flows on the side of the plate by means of a plate side baffle The track forms two lateral sections, wherein the length of the plate side baffle is equal to the radial length of the heat exchanger plate, and two mutually separated lateral zones are formed in the plate side flow path, and respectively in the two A pair of inlet and outlet holes for the fluid on the side of the plate are disposed at upper and lower ends of the mutually separated lateral partitions.
The side-flow plate-and-shell heat exchanger plate according to claim 3, wherein the heat exchanger plate of the isolation zone is guided by two shell side baffles, bottom and top baffles, and left and right sides The plate forms two lateral partitions separated from each other at the shell side flow passage, and realizes a shell side baffle in which the shell side fluid and the plate side fluid are in a countercurrent state.
The side-flow plate-and-shell heat exchanger plate according to any one of claims 1 to 4, wherein the heat exchange plate is circular or elliptical.
The multi-flow detachable shell-and-shell heat exchanger according to claim 5, wherein the heat exchange plate can obtain different thermal performance by changing geometric characteristics, and the heat exchanger plate has different geometric characteristics. Can be mixed and arranged in the same heat exchange core.
A multi-flow detachable shell-and-shell heat exchanger according to claim 6 wherein said geometric features comprise a smooth surface, a V-shaped fish wave, a circular or irregular pit, a stud, and the like. For strengthening the structure of heat exchange.
A multi-process detachable shell-and-shell heat exchanger comprising a front and rear end cover, a casing and a heat exchange core, characterized in that a plurality of side flow heat exchanger plates according to claim 1 or 2 are arranged along the periphery and in and out The round holes are alternately welded together to form the heat exchange core in which the plate side flow path and the shell side flow path alternate with each other.
A multi-process detachable shell-and-shell heat exchanger comprising a front and rear end cover, a casing and a heat exchange core, characterized in that a plurality of side flow heat exchanger plates according to claim 1 or 2 are arranged along the periphery and in and out The round holes are alternately welded together to form a heat exchange core portion of the two processes abutting the rear end cover, and the plurality of isolation zone heat exchange plates according to claim 3 or 4 are alternately welded along the periphery and the inlet and outlet holes. Together, a heat exchange core portion of all other processes except the two processes immediately adjacent to the back end cover is formed.
The multi-flow detachable shell-and-shell heat exchanger according to claim 9, wherein the side flow heat exchanger plate is used for completing the flow direction rotation in the longitudinal direction, and the rear end cover does not need to be provided with a plate. A side joint, the heat exchange core can be detached from the housing.
The multi-flow detachable shell-and-shell heat exchanger according to claim 8 or 9, wherein the plate side flow passage and the shell side flow passage are formed by planar contact between adjacent heat exchange plates, and Shell side flow, baffle and isolation mechanisms do not require soldering.
The multi-flow detachable shell and tube heat exchanger of claim 11 wherein said shell side flow, baffle and isolation means may be partially or completely replaced by a welded structure or other sealing structure.
The multi-flow detachable shell-and-shell heat exchanger according to claim 12, wherein the relative flow directions between adjacent heat exchange passages are set to be completely reverse flow, completely co-current flow, and reverse co-directional mixing. Flow or cross flow to achieve thermal optimization under different application conditions.