Heat exchanger with cleaning function

Abstract

The heat exchanger with the cleaning function comprises an upper tube box, an upper tube plate, a shell, a lower tube plate and a lower tube box which are sequentially arranged from top to bottom, and a plurality of heat exchange tubes are arranged in the shell. Cleaning pipes are further distributed in the shell, the cleaning pipes are distributed among the heat exchange pipes and between the heat exchange pipes and the inner wall of the shell, and a plurality of spraying holes are evenly distributed in the side walls of the cleaning pipes; and a cleaning medium inlet and a cleaning medium outlet at the two ends of the cleaning pipe are respectively fixed on the outer wall of the shell. The cleaning pipe is arranged in the shell, and the spraying holes are formed in the side wall of the cleaning pipe, so that on one hand, cleaning media can be introduced into the cleaning pipe to deeply clean the inner wall of the shell and the outer wall of the heat exchange pipe, the heat exchange efficiency of the heat exchanger is improved, and the service life of the heat exchanger is prolonged; and on the other hand, high-temperature steam can be introduced into the cleaning pipe before the heat exchanger runs, so that the temperature of the equipment is quickly increased, the initial activation time of the catalyst is shortened, and the production efficiency is improved.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchanger equipment, and in particular to a heat exchanger with a self-cleaning function. Background Art

[0002] The structure of PVC converter is mostly fixed tube plate heat exchanger, which has good heat exchange efficiency, low cost, simple manufacturing and high economy. There are two main processes for PVC production, one is calcium carbide method and the other is ethylene method. Due to the limitation of natural resources, my country mainly uses calcium carbide method, and the reaction of the mixed gas of vinyl chloride and acetylene with the catalyst in the heat exchange tube of the converter is the main core of this process.

[0003] The heat exchange medium in the shell of the PVC converter is hot water. The converters in the northwest region of my country mostly use groundwater pumped from the ground. After repeated high-temperature heating and circulation processes, it will deposit and scale inside the shell of the converter, which will greatly reduce the service life and conversion efficiency of the converter. Summary of the invention

[0004] The present application provides a heat exchanger with a self-cleaning function, which solves the problem that scaling occurs inside the shell side of the existing heat exchanger, thereby greatly reducing the service life and conversion efficiency of the heat exchanger.

[0005] The present application provides a heat exchanger with a self-cleaning function, comprising an upper tube box, an upper tube sheet, a shell, a lower tube sheet and a lower tube box which are arranged in sequence from top to bottom, wherein a plurality of heat exchange tubes are arranged inside the shell; the upper tube box and the lower tube box are respectively provided with a tube-side medium inlet and a tube-side medium outlet, and the side wall of the shell is provided with a shell-side medium inlet and a shell-side medium outlet; a cleaning pipe is also arranged inside the shell, and the cleaning pipe is arranged between the plurality of heat exchange tubes and between the heat exchange tubes and the inner wall of the shell, and a plurality of spray holes are evenly arranged on the side wall of the cleaning pipe; the cleaning medium inlet and the cleaning medium outlet at both ends of the cleaning pipe are respectively fixed on the outer wall of the shell, and valves are provided on the cleaning medium inlet and the cleaning medium outlet.

[0006] In the technical solution provided in the present application, a cleaning pipe is arranged in the shell, and a plurality of spray holes are arranged on the side wall of the cleaning pipe. On the one hand, a cleaning medium can be introduced into the cleaning pipe and sprayed out through the plurality of spray holes on the side wall of the cleaning pipe to deeply clean the inner wall of the shell and the outer wall of the heat exchange tube, thereby improving the heat exchange efficiency and service life of the heat exchanger. On the other hand, high-temperature steam can be introduced into the cleaning pipe before the heat exchanger is operated, and the high-temperature steam sprayed out through the spray holes can be used to assist in heating the shell, so that the equipment can be heated up quickly, the initial activation time of the catalyst can be shortened, and the production efficiency can be improved.

[0007] In some embodiments, the cleaning pipe includes an upper uniformly distributed pipe, a lower uniformly distributed pipe and a plurality of first connecting pipes, and the two ends of the plurality of first connecting pipes are respectively connected to the upper uniformly distributed pipe and the lower uniformly distributed pipe; the cleaning medium inlet is connected to the upper uniformly distributed pipe, and the cleaning medium outlet is connected to the lower uniformly distributed pipe. By setting the upper uniformly distributed pipe and the lower uniformly distributed pipe, the coverage of the cleaning pipe can be expanded and the cleaning effect can be improved.

[0008] In some embodiments, the upper uniformly distributed tube and the lower uniformly distributed tube both include a plurality of concentrically arranged annular tubes, which are connected by a second connecting tube. By designing the uniformly distributed tube as a plurality of concentrically arranged annular tubes, the cleaning range of the uniformly distributed tube can cover the entire radial cross-section of the shell, ensuring that the cleaning tube can clean the interior of the shell without dead angles, thereby improving the cleaning effect.

[0009] In some embodiments, there are multiple cleaning medium inlets and multiple cleaning medium outlets, and the multiple cleaning medium inlets and multiple cleaning medium outlets are evenly arranged along the circumference of the outer wall of the shell. By setting multiple cleaning medium inlets and multiple cleaning medium outlets, the cleaning efficiency and auxiliary heating efficiency are improved, and time cost is saved.

[0010] In certain embodiments, a plurality of the first connecting tubes and a plurality of heat exchange tubes are arranged alternately, so as to facilitate all-round cleaning of all the heat exchange tubes and improve the effect of cleaning the outer wall of the heat exchange tubes.

[0011] In some embodiments, the bottom side wall of the shell is provided with a drain outlet, and the drain outlet is provided with a valve. By providing the drain outlet on the bottom side wall of the shell and providing the valve at the drain outlet, it is convenient to discharge the sewage after cleaning the shell and ensure the sealing of the shell when the heat exchanger is running.

[0012] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The drawings in this application are used to illustrate preferred embodiments, so that those skilled in the art can clearly understand various other advantages and benefits, and should not be considered as limitations of this application. In addition, the same reference numerals are used throughout the drawings to represent the same or similar components.

[0014] Figure 1 This is a schematic diagram of the internal structure of a heat exchanger with a self-cleaning function in one embodiment of the present application;

[0015] Figure 2This is a schematic diagram of the connection structure between the upper uniformly distributed pipe and the lower uniformly distributed pipe in one embodiment of the present application;

[0016] Figure 3 This is a schematic diagram of the structure of the upper uniformly distributed tube or the lower uniformly distributed tube in one embodiment of the present application;

[0017] Icons: 1. Upper tube box; 2. Upper tube sheet; 3. Shell; 4. Lower tube sheet; 5. Lower tube box; 6. Heat exchange tube; 7. Tube-side medium inlet; 8. Tube-side medium outlet; 9. Shell-side medium inlet; 10. Shell-side medium outlet; 11. Cleaning tube; 12. Spray hole; 13. Cleaning medium inlet; 14. Cleaning medium outlet; 15. Upper uniformly distributed tube; 16. Lower uniformly distributed tube; 17. First connecting tube; 18. Annular tube; 19. Second connecting tube; 20. Sewage outlet. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two (including two), unless otherwise clearly and specifically defined.

[0021] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0022] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0023] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0024] See also Figure 1-Figure 3 The embodiment of the present application provides a heat exchanger with a self-cleaning function, comprising an upper tube box 1, an upper tube sheet 2, a shell 3, a lower tube sheet 4 and a lower tube box 5 which are arranged in sequence from top to bottom, wherein a plurality of heat exchange tubes 6 are arranged inside the shell 3, and the two ends of the heat exchange tubes 6 are respectively connected to the upper tube sheet 2 and the lower tube sheet 4; the upper tube box 1 is provided with a tube-side medium inlet 7, and the lower tube box 5 is provided with a tube-side medium outlet 8; a shell-side medium inlet 9 and a shell-side medium outlet 10 are provided on the side wall of the shell 3; a cleaning pipe 11 is also arranged inside the shell 3, and the cleaning pipe 11 is arranged between the plurality of heat exchange tubes 6 and between the heat exchange tubes 6 and the inner wall of the shell 3, and a plurality of spray holes 12 are evenly arranged on the side wall of the cleaning pipe 11; a cleaning medium inlet 13 and a cleaning medium outlet 14 at both ends of the cleaning pipe 11 respectively penetrate the shell 3 and are fixed on the outer wall of the shell 3, and a valve is provided on the cleaning medium inlet 13 and the cleaning medium outlet 14 (in the specific implementation process, the cleaning medium inlet 13 and the cleaning medium outlet 14 can also be temporarily blocked by a plug).

[0025] In the technical solution provided in the present application, a cleaning pipe 11 is arranged in the shell 3, and a plurality of spray holes 12 are arranged on the side wall of the cleaning pipe 11. On the one hand, a cleaning medium can be introduced into the cleaning pipe 11 and sprayed out through the plurality of spray holes 12 on the side wall of the cleaning pipe 11, so as to deeply clean the inner wall of the shell 3 and the outer wall of the heat exchange tube 6, thereby improving the heat exchange efficiency and service life of the heat exchanger; on the other hand, high-temperature steam can be introduced into the cleaning pipe 11 before the heat exchanger is operated, and the high-temperature steam sprayed out through the spray holes 12 can be used to assist in heating the shell 3, so that the equipment can be heated up quickly, the initial activation time of the catalyst can be shortened, and the production efficiency can be improved.

[0026] Please continue reading Figure 2 In some embodiments, the cleaning pipe 11 includes an upper uniformly distributed pipe 15, a lower uniformly distributed pipe 16 and a plurality of first connecting pipes 17, and the two ends of the plurality of first connecting pipes 17 are respectively connected to the upper uniformly distributed pipe 15 and the lower uniformly distributed pipe 16; the cleaning medium inlet 13 is connected to the upper uniformly distributed pipe 15, and the cleaning medium outlet 14 is connected to the lower uniformly distributed pipe 16. By setting the upper uniformly distributed pipe 15 and the lower uniformly distributed pipe 16, the coverage of the cleaning pipe 11 can be expanded and the cleaning effect can be improved.

[0027] Please continue reading Figure 3 In some embodiments, the upper uniformly distributed tube 15 and the lower uniformly distributed tube 16 each include three concentrically arranged annular tubes 18 (the specific number can be flexibly adjusted according to actual conditions), and the three concentrically arranged annular tubes 18 are connected by a second connecting tube 19. By designing the uniformly distributed tube as three concentrically arranged annular tubes 18, the cleaning range of the uniformly distributed tube can cover the entire radial cross-section of the shell 3, ensuring that the cleaning tube 11 can clean the inside of the shell 3 without dead angles, thereby improving the cleaning effect.

[0028] Please continue reading Figure 2 , Figure 3 In some embodiments, there are four cleaning medium inlets 13 and four cleaning medium outlets 14 (the specific number can be flexibly adjusted according to actual conditions). The four cleaning medium inlets 13 and the four cleaning medium outlets 14 are evenly arranged along the circumference of the outer wall of the shell 3. By setting four cleaning medium inlets 13 and four cleaning medium outlets 14, the cleaning efficiency and auxiliary heating efficiency are improved, and time cost is saved.

[0029] Please continue reading Figure 1 In some embodiments, a plurality of the first connecting tubes 17 and a plurality of the heat exchange tubes 6 are arranged alternately, so as to facilitate all-round cleaning of all the heat exchange tubes 6 and improve the cleaning effect of the outer wall of the heat exchange tubes 6 .

[0030] Please continue reading Figure 1In some embodiments, a sewage outlet 20 is provided on the bottom side wall of the shell 3, and the sewage outlet 20 is provided with a valve (in the specific implementation process, the sewage outlet 20 can also be temporarily blocked with a plug). By providing a sewage outlet 20 on the bottom side wall of the shell 3 and providing a valve at the sewage outlet 20, it is convenient to discharge sewage after cleaning the shell 3 and ensure the sealing of the shell 3 when the heat exchanger is running.

[0031] The working process of the cleaning pipe 11 in this application is as follows:

[0032] When it is necessary to clean the inside of the shell 3, first open the valve of the drain port 20 to discharge the residual medium in the shell 3, and then close the valve of the drain port 20; then open the valves of the cleaning medium inlet 13 and the cleaning medium outlet 14, and close the valves of the shell-side medium inlet 9 and the shell-side medium outlet 10; introduce the cleaning medium into the shell 3 through the cleaning medium inlet 13 to clean the impurities such as scale adhered to the inner wall of the shell 3 and the outer wall of the heat exchange tube 6. After the cleaning is completed, close the valves of the cleaning medium inlet 13 and the cleaning medium outlet 14, open the valve of the drain port 20, discharge the sewage in the shell 3, and then close the drain port 20.

[0033] After the heat exchanger is transported to the equipment site, it is necessary to carry out temperature and pressure testing and initial temperature and activation of the catalyst. Due to the large internal volume of the equipment, it often takes several days to complete the initial activation of the catalyst through the temperature increase of the shell inlet and outlet. When the equipment needs to be heated by auxiliary heat, the valves of the shell medium inlet 9 and the shell medium outlet 10 are first closed, and then the valves of the cleaning medium inlet 13, the cleaning medium outlet 14 and the sewage outlet 20 are opened. Then, high-temperature and high-pressure steam is introduced into the cleaning pipe 11. The steam is sprayed out along the spray holes 12 on the side walls of the uniform distribution pipe and the first connecting pipe 17 and is evenly distributed to the inside of the shell 3. The condensed water is discharged from the sewage outlet 20, thereby realizing rapid heating of the inside of the shell 3, reducing the test preparation time before equipment operation, and improving production efficiency.

[0034] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no contradiction or conflict, the various technical features mentioned in the embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A heat exchanger with a self-cleaning function, comprising an upper tube box (1), an upper tube sheet (2), a shell (3), a lower tube sheet (4) and a lower tube box (5) arranged in sequence from top to bottom, wherein a plurality of heat exchange tubes (6) are arranged inside the shell (3); the upper tube box (1) and the lower tube box (5) are respectively provided with a tube-side medium inlet (7) and a tube-side medium outlet (8), and the side wall of the shell (3) is provided with a shell-side medium inlet (9) and a shell-side medium outlet (10); characterized in that: A cleaning pipe (11) is also arranged in the shell (3); the cleaning pipe (11) is arranged between the plurality of heat exchange pipes (6) and between the heat exchange pipes (6) and the inner wall of the shell (3); a plurality of spray holes (12) are evenly arranged on the side wall of the cleaning pipe (11); and the cleaning medium inlet (13) and the cleaning medium outlet (14) at both ends of the cleaning pipe (11) are respectively fixed on the outer wall of the shell (3).

2. A heat exchanger with self-cleaning function according to claim 1, characterized in that: The cleaning pipe (11) comprises an upper uniformly distributed pipe (15), a lower uniformly distributed pipe (16) and a plurality of first connecting pipes (17), the two ends of the plurality of first connecting pipes (17) being respectively connected to the upper uniformly distributed pipe (15) and the lower uniformly distributed pipe (16); the cleaning medium inlet (13) is connected to the upper uniformly distributed pipe (15), and the cleaning medium outlet (14) is connected to the lower uniformly distributed pipe (16).

3. A heat exchanger with self-cleaning function according to claim 2, characterized in that: The upper uniformly distributed pipe (15) and the lower uniformly distributed pipe (16) both include a plurality of concentrically arranged annular pipes (18), and the concentrically arranged annular pipes (18) are connected via a second connecting pipe (19).

4. The heat exchanger with self-cleaning function according to claim 2, characterized in that: A plurality of cleaning medium inlets (13) and cleaning medium outlets (14) are provided, and the plurality of cleaning medium inlets (13) and the plurality of cleaning medium outlets (14) are evenly arranged along the circumference of the outer wall of the shell (3).

5. The heat exchanger with self-cleaning function according to claim 2, characterized in that: The plurality of first connecting tubes (17) and the plurality of heat exchange tubes (6) are arranged alternately.

6. The heat exchanger with self-cleaning function according to claim 1, characterized in that: The bottom side wall of the shell (3) is provided with a sewage outlet (20).

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