Plate heat exchanger

Abstract

The present application relates to heat exchange device technical field, in order to solve the problem of big heat exchange efficiency attenuation of the existing plate heat exchanger in the use process, provide a kind of plate heat exchanger, including shell, heat exchange cavity is provided in shell, the sidewall of shell is respectively provided with first fluid inlet and first fluid outlet with heat exchange cavity communication, heat exchange plate group is provided in heat exchange cavity, heat exchange plate group includes multiple heat exchange plates, second fluid passage is provided in heat exchange plate;Second fluid inlet and second fluid outlet are also provided on shell;Heat exchange plate includes two heat exchange fins, two heat exchange fins are welded to form heat exchange plate, second fluid passage is formed between heat exchange fin, first communication port and second communication port for communicating second fluid passage are also provided on heat exchange plate, first communication port is communicated with second fluid inlet, second communication port is communicated with second fluid outlet;First fluid is process medium, and second fluid is heat exchange medium;It also includes the cleaning structure for the automatic cleaning of heat exchange plate surface.

Description

TECHNICAL FIELD

[0001] The present application relates to heat exchange device technical field, specifically to a plate heat exchanger. BACKGROUND

[0002] The heat exchanger is a kind of equipment that the part heat of hot fluid is transferred to cold fluid, is widely applied in petroleum chemical industry and the heat exchange field needing heat exchange. The existing plate heat exchanger includes multiple heat exchange sheets, the flow channel of hot fluid or cold fluid is arranged in heat exchange sheet, and the flow channel of cold fluid or hot fluid is formed between multiple heat exchange sheets, then hot fluid and cold fluid are input, and heat exchange operation is realized in the flow process of hot fluid and cold fluid.

[0003] However, although for other heat exchangers, the plate heat exchanger because the area of heat exchange sheet is relatively large, so the heat exchange efficiency is relatively high. But in the use process, it is found that the heat exchange efficiency is relatively high at the beginning, after using for a period of time, the heat exchange efficiency is reduced a lot, and the heat exchange efficiency attenuation is large. SUMMARY

[0004] The present application aims to provide a plate heat exchanger to solve the problem of large heat exchange efficiency attenuation of the existing plate heat exchanger in the use process.

[0005] The basic scheme provided by the present application is: plate heat exchanger, including shell, the heat exchange cavity is arranged in shell, the first fluid inlet and the first fluid outlet are arranged on the side wall of shell and communicated with heat exchange cavity, the heat exchange plate group is arranged in heat exchange cavity, the heat exchange plate group includes multiple heat exchange plates, and the second fluid channel is arranged in heat exchange plate;Second fluid inlet and second fluid outlet are further arranged on the shell;

[0006] Wherein: the heat exchange plate includes two heat exchange sheets, and the two heat exchange sheets are welded to form the heat exchange plate, the second fluid channel is formed between the heat exchange sheets, and the first communication port and the second communication port communicated with the second fluid channel are further arranged on the heat exchange plate, the first communication port is communicated with the second fluid inlet, and the second communication port is communicated with the second fluid outlet;The first fluid is process medium, and the second fluid is heat exchange medium;Further including the cleaning structure for automatically cleaning the surface of heat exchange plate.

[0007] The working principle and beneficial effects of the basic scheme are as follows: in the prior art, the heat exchanger is formed by fastening multiple heat exchange plates together by screws, and the multiple heat exchange plates are prone to fouling, and once the heat exchange plates are fouled, the heat exchange efficiency of the heat exchange plates will decrease, resulting in attenuation of the heat exchange efficiency; in the scheme, the heat exchange plate is composed of two heat exchange plates, and compared with the prior art, the multiple heat exchange plates in the heat exchange plate group are relatively independently arranged, so that the flow channel between the heat exchange plates is widened, and the surface of the heat exchange plate is cleaned by the cleaning mechanism, the widened flow channel also facilitates cleaning of the cleaning structure, so that the heat exchange efficiency is less likely to decrease, and the attenuation of the heat exchange efficiency is lower than that of the prior art.

[0008] Preferred scheme one: as a preferred scheme of the basic scheme, the surface of the heat exchange plate is provided with a corrugated structure. Beneficial effects: in the scheme, the corrugated structure increases the surface area of the heat exchange plate, thereby improving the heat exchange efficiency.

[0009] Preferred scheme two: as a preferred scheme of the basic scheme, the shell further comprises a partition plate for partitioning the heat exchange cavity. Beneficial effects: in the scheme, the partition plate can partition the heat exchange cavity in the shell, thereby prolonging the heat exchange stroke in the heat exchange cavity and improving the heat exchange efficiency.

[0010] Preferred scheme three: as a preferred scheme of the basic scheme, the cleaning structure comprises a high-pressure cleaning pipe, and the cleaning pipe is provided with a cleaning nozzle on the side wall. Beneficial effects: in the scheme, the high-pressure cleaning pipe and the cleaning nozzle can realize high-pressure flushing operation on the surface of the heat exchange plate, which is simple to operate, and the high-pressure flushing mode can improve the cleaning degree of the surface of the heat exchange plate.

[0011] Preferred scheme four: as a preferred scheme of the preferred scheme three, the cleaning structure further comprises a control module for controlling the high-pressure cleaning pipe to perform automatic cleaning operation. Beneficial effects: in the scheme, the control module realizes automation of the cleaning operation, thereby improving the cleaning efficiency.

[0012] Preferred scheme five: as a preferred scheme of the preferred scheme four, the cleaning structure further comprises an X-axis moving structure and a Y-axis moving structure, the X-axis moving structure is used to control the high-pressure cleaning pipe to move along the X-axis direction, and the Y-axis moving structure is used to control the high-pressure cleaning pipe to move along the Y-axis direction. Beneficial effects: in the scheme, the cooperation of the X-axis moving structure and the Y-axis moving structure realizes movement of the high-pressure cleaning pipe in the X-axis and Y-axis directions, so that the high-pressure cleaning pipe can clean both sides of the heat exchange plate, thereby ensuring the cleaning effect. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is a front view of the plate heat exchanger embodiment of the present application.

[0014] Figure 2 for Figure 1 Top view;

[0015] Figure 3 for Figure 1 The left view;

[0016] Figure 4 for Figure 1 A partial structural diagram of the heat exchanger assembly;

[0017] Figure 5 for Figure 1 A schematic diagram of the cleaning structure. Detailed Implementation

[0018] The following detailed description illustrates the specific implementation method:

[0019] The reference numerals in the accompanying drawings include: housing 1, cover plate 10, first channel 11, fluid channel 12, heat exchange plate 2, partition plate connection port 22, X-axis moving rod 16, Y-axis moving rod 17, motor 14, first fluid inlet 3, first fluid outlet 4, second fluid inlet 5, second fluid outlet 6, sludge discharge port 9, partition plate 21, second fluid connection port 18, second fluid connection inlet 19, second fluid connection outlet 20, cleaning structure 7, high-pressure cleaning pipe 7-A, cleaning nozzle 7-B, X-axis guide hole 7-E, Y-axis guide hole 7-F.

[0020] The basic implementation examples are as follows: Figures 1 to 5 As shown: a plate heat exchanger, including an open shell 1 and a cover plate 10 that matches the shell 1. In this embodiment, the shell 1 is a rectangular shell 1. A heat exchange cavity is provided inside the shell 1. The front side wall and the rear side of the shell 1 are respectively provided with a first fluid inlet 3 and a first fluid outlet 4 that communicate with the heat exchange cavity. The first fluid inlet 3 and the first fluid outlet 4 are arranged opposite to each other and communicated through a first channel 11.

[0021] A heat exchange plate assembly is provided inside the heat exchange chamber. The heat exchange plate assembly includes multiple heat exchange plates 2. The distance between two adjacent heat exchange plates 2 is 1-10mm. A second fluid channel 12 is provided inside the heat exchange plate 2. Specifically, the heat exchange plate 2 includes two heat exchange fins. The two heat exchange fins are welded to form the heat exchange plate 2. A second fluid channel 12 is formed between the heat exchange fins. The surface of the heat exchange fins is provided with a corrugated structure to enhance the heat exchange area of ​​the heat exchange plate 2.

[0022] A second fluid inlet is provided at the bottom of the casing 1, such as... Figure 2As shown, the left side wall of the shell 1 is provided with a second fluid inlet 5 and a second fluid outlet 6, and the heat exchange plate 2 is also provided with a first communication port and a second communication port communicating with the second fluid channel 12, the first communication port communicates with the second fluid inlet through the fluid channel 12, and the second communication port communicates with the second fluid outlet, specifically, the first communication port is arranged at the bottom end of the heat exchange plate 2, and the second communication port is arranged at the top end of the heat exchange plate 2, the bottom ends of the plurality of heat exchange plates 2 are arranged on the first communication pipe, and the first communication pipe is provided with a second fluid communication port 18 corresponding to the plurality of heat exchange plates 2, and the top ends of the plurality of heat exchange plates 2 are arranged on the second communication pipe, and the second communication pipe is provided with a second fluid communication inlet 19 corresponding to the plurality of heat exchange plates 2, and the second fluid channel 12 in the heat exchange plate 2 communicates with the second communication pipe through the second fluid outlet. Figure 4 As shown, the second fluid channel 12 in the heat exchange plate 2 communicates with the first communication pipe through the second fluid inlet, the top ends of the plurality of heat exchange plates 2 are arranged on the second communication pipe, the second communication pipe is provided with a second fluid communication inlet 19 corresponding to the plurality of heat exchange plates 2, and the second fluid channel 12 in the heat exchange plate 2 communicates with the second communication pipe through the second fluid outlet; the first fluid is a process medium, and the second fluid is a heat exchange medium. The first fluid pressure is 0.001Mpa-0.3Mpa, and the second fluid pressure is 0.01Mpa-0.3Mpa.

[0023] The second fluid inlet and the second fluid outlet 6 are respectively connected with the corresponding specially arranged inlet communication pipe and outlet communication pipe, and are connected by welding, or can be connected by high-pressure pipe thread connection.

[0024] The shell 1 is also provided with a partition plate 21 which can cut off the heat exchange cavity according to the heat exchange stroke, the arrangement of the partition plate 21 makes the heat exchange cavity have two heat exchange strokes; the partition plate 21 is provided with a partition plate communication port 22, and the arrangement of the partition plate communication port 22 makes the heat exchange cavities on both sides of the partition plate 21 communicate.

[0025] The shell 1 is also provided with a cleaning structure 7, specifically, as shown in the figure, Figure 5 The cleaning structure 7 includes a movable block, an X-axis moving rod 16 and a Y-axis moving rod 17, the movable block is provided with an X-axis guide hole 7-E in the horizontal direction, the X-axis moving rod 16 passes through the X-axis guide hole 7-E, the movable block is provided with a Y-axis guide hole 7-F in the width direction, and the Y-axis moving rod 17 passes through the Y-axis guide hole 7-F. The movable block is also provided with an L-shaped water pipe guide hole, and a high-pressure cleaning pipe 7-A is connected with the movable block after passing through the water pipe guide hole. Preferably, the X-axis moving rod 16 and the Y-axis moving rod 17 are respectively driven by a motor 14, and the cleaning structure 7 further includes a control module for controlling the motor 14 to move according to a preset cleaning track, so as to realize the automatic movement of the X-axis moving rod 16 and the Y-axis moving rod 17, and achieve the purpose of automatic cleaning.

[0026] A plurality of cleaning nozzles 7-B are arranged on the side wall of the high-pressure cleaning pipe 7-A, and the cleaning nozzles 7-B are arranged corresponding to the concave parts in the corrugated structure on the surface of the heat exchange fin, and a sludge discharge port 9 is further arranged on the bottom plate of the shell 1.

[0027] The implementation process is as follows: in this embodiment, the natural gas partial oxidation acetylene hot carbon black water is used as the process medium, and the desalted soft water is used as the heat exchange medium, that is, the first fluid is the natural gas partial oxidation acetylene hot carbon black water, and the second fluid is the desalted soft water. In use, the plate heat exchanger in this embodiment is used, the first fluid flows into the heat exchange cavity through the first fluid inlet 3, and then flows out of the heat exchange cavity through the first fluid outlet; the second fluid flows into the heat exchange plate 2 through the second fluid inlet, and then flows out of the shell 1 through the second fluid outlet 6 on the shell 1; since the heat exchange plate group is located in the heat exchange cavity, the second fluid in the heat exchange plate 2 exchanges heat with the first fluid in the heat exchange cavity during the flow of the second fluid in the heat exchange plate 2, so that the heat exchange purpose is achieved.

[0028] When it is necessary to clean the heat exchange plate 2, the control module controls the X-axis moving rod 16 and the Y-axis moving rod 17 to move in the shell 1 according to the preset moving track, so as to drive the movable block to move in the shell 1, and the high-pressure cleaning pipe 7-A connected to the movable block is filled with clean water, the clean water is sprayed out of the high-pressure cleaning pipe 7-A through the cleaning nozzle 7-B, and the surface of the heat exchange plate 2 is high-pressure washed, so that the automatic cleaning operation of the heat exchange plate 2 is achieved.

[0029] In this embodiment, the natural gas partial oxidation acetylene hot carbon black water is taken as the first fluid, and the desalted soft water is taken as the second fluid for heat exchange experiment. The natural gas acetylene hot carbon black water has a temperature of 78℃, contains a small amount of carbon black, is easy to adhere to the pipeline, and has a turbidity of 18NTU-25NTU. The conventional plate heat exchanger has an area of 20m 2 The plate heat exchanger of this embodiment has a heat exchange area of 20m 2 The point temperature instrument is a field mechanical temperature instrument.

[0030] Comparative Example 1

[0031] The natural gas acetylene hot carbon black water is taken as the first fluid, and the soft water is taken as the second fluid for cooling heat exchange experiment on the conventional plate heat exchanger. The experimental data are shown in Table 1 below.

[0032] Table 1: Cooling heat exchange operation data of hot carbon black water of conventional plate heat exchanger

[0033]

[0034] Example 1

[0035] The natural gas acetylene hot carbon black water is taken as the first fluid, and the soft water is taken as the second fluid for operation experiment on the plate heat exchanger of this embodiment without periodic cleaning. The experimental data are shown in Table 2 below.

[0036] Table 2: Cooling heat exchange operation data of hot carbon black water of plate heat exchanger of this embodiment

[0037]

[0038] Example 2

[0039] The hot carbon black water from the production of acetylene from natural gas was used as the first fluid, and soft water was used as the second fluid to run the plate heat exchanger of the present application, and automatic cleaning was performed every 8 hours. The test data are shown in Table 3 below.

[0040] Table 3 Hot carbon black water cooling and heat exchange running data of the plate heat exchanger of the present application

[0041]

[0042] Comparative analysis of Example 1, Example 2 and Comparative Example 1:

[0043] As shown in Table 1 and Table 2, after running for 96 hours, the outlet water temperature of the first fluid of Example 1 increased by 27.5%, and the outlet water temperature of the first fluid of Example 2 increased by 22.5%, which indicates that the heat exchange efficiency of the plate heat exchanger of the present application is reduced better than that of the conventional plate heat exchanger.

[0044] As shown in Table 1 and Table 3, after running for 96 hours, the outlet water temperature of the first fluid of Example 1 increased by 27.5%, while the outlet water temperature of the first fluid of Example 1 increased by 2.5%, the outlet water temperature of the second fluid of Example 1 decreased by 18%, and the outlet water temperature of the first fluid of Example 2 decreased by 1.3%, which indicates that the heat exchange effect of the plate heat exchanger of the present application decays much better than that of the conventional plate heat exchanger.

[0045] As shown in Table 2 and Table 3, because Example 1 does not have automatic cleaning, after running for 96 hours, the outlet water temperature of the first fluid of Example 1 increased by 22.5%, while the outlet water temperature of the first fluid of Example 2 increased by 2.5%, the outlet water temperature of the second fluid of Example 1 decreased by 16%, and the outlet water temperature of the first fluid of Example 2 decreased by 1.3%, which indicates that online automatic cleaning has a great influence on the high-efficiency operation of the plate heat exchanger of the present application.

[0046] Based on the above examples, it is verified that the plate heat exchanger of the present application is obviously superior to the conventional plate heat exchanger in terms of anti-blocking performance and outlet water temperature stability of the heat exchange medium.

[0047] The above-mentioned are only embodiments of the present application, and the common knowledge of specific structures and characteristics in the scheme is not described too much herein. The ordinary skilled person in the art knows all the ordinary technical knowledge in the field of the present application before the application date or the priority date, can know all the prior art in the field, and has the ability to apply conventional experimental means before that date. The ordinary skilled person in the art can perfect and implement the present scheme under the guidance of the present application, combined with their own ability. Some typical known structures or known methods should not be an obstacle for the ordinary skilled person in the art to implement the present application. It should be noted that, for those skilled in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application. These will not affect the effect and practicality of the patent. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A plate heat exchanger, comprising a shell, wherein a heat exchange cavity is provided inside the shell, a first fluid inlet and a first fluid outlet communicating with the heat exchange cavity are respectively provided on the side wall of the shell, a heat exchange plate assembly is provided inside the heat exchange cavity, the heat exchange plate assembly includes multiple heat exchange plates, and a second fluid channel is provided inside the heat exchange plates; the shell is also provided with a second fluid inlet and a second fluid outlet; Its features are: The heat exchange plate includes two heat exchange plates welded together to form the heat exchange plate, with a second fluid channel formed between the heat exchange plates. The heat exchange plate also has a first connecting port and a second connecting port communicating with the second fluid channel. The first connecting port communicates with the second fluid inlet, and the second connecting port communicates with the second fluid outlet. The first fluid is a process medium, and the second fluid is a heat exchange medium. The heat exchange plate also includes a cleaning structure for automatically cleaning its surface. The cleaning structure includes a high-pressure cleaning pipe with cleaning nozzles on its sidewall. The heat exchange plates have a corrugated structure, and the cleaning nozzles correspond to the recessed portions of the corrugated structure on the heat exchange plate surface. The cleaning structure further includes an X-axis moving structure and a Y-axis moving structure. The X-axis moving structure controls the high-pressure cleaning pipe to move along the X-axis, and the Y-axis moving structure controls the high-pressure cleaning pipe to move along the Y-axis.

2. The plate heat exchanger according to claim 1, characterized in that: The housing also includes a partition plate that separates the heat exchange chamber, and the lower end of the partition plate is provided with a communication port.

3. The plate heat exchanger according to claim 1, characterized in that: The cleaning structure also includes a control module for controlling the high-pressure cleaning pipe to perform automatic cleaning operations.

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