A jacket heat exchanger with adjustable inner roundness

Abstract

The present invention relates to the technical field of jacket heat exchangers, and particularly relates to a jacket heat exchanger with adjustable roundness, which includes a cylindrical body and a heat exchange jacket. The heat exchange jacket includes a semi-circular tube group circumferentially distributed around the outer wall of the cylindrical body. A plurality of semi-circular pipes in the semi-circular tube group are axially distributed along the cylindrical body, and a welding strip fixed to the outer wall of the cylindrical body is provided between two adjacent semi-circular pipes. The jacket heat exchanger further includes a roundness adjusting device, which includes a support frame fixed on the outer side of the heat exchange jacket and a plurality of adjusting columns installed on the support frame and circumferentially distributed around the outer side of the heat exchange jacket in a separated manner. The plurality of adjusting columns are adjustably connected to the support frame and indirectly extrude the side wall of the cylindrical body by pressing against the welding strip to different degrees. During installation, operate the plurality of adjusting columns to press against the outer wall of the cylindrical body to different degrees to adjust the roundness of the inner wall of the cylindrical body; even after the heat exchanger has been operating for a period of time, the adjusting columns can be operated again as needed for adjustment, and the maintenance is convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of jacket heat exchangers, and particularly to a jacket heat exchanger with adjustable roundness of the inner circle. Background Art

[0002] Heat exchangers (heat exchangers or reactors) are widely used in the petrochemical industry. Compared with cylindrical jacket heat exchangers, jacket heat exchangers with external jacket forms such as spiral guide plates or semi-circular pipes have thinner cylinder walls, save material usage, have a relatively low cost, faster fluid flow velocity in the outer cooling jacket, higher heat transfer efficiency, reduced energy consumption, and more compact structures. The form of the cooling jacket can refer to the appendix of Chinese document with publication number CN2822760Y Figure 2 ~5. The cooling jacket on the outer side of the cylinder includes a closed spiral guide plate flat steel welded full-flow jacket structure, a semi-circular pipe welded full-flow jacket structure, an angle steel welded full-flow jacket structure, and a semi-circular pipe laminated welded full-flow jacket structure. Cooling water is introduced into the cooling jacket, and the material is cooled through the side wall of the cylinder. By adopting the form of the cooling jacket, the metal wall thickness of the jacket can be appropriately reduced, the thermal resistance of the metal wall for heat conduction can be reduced, and thus the heat exchange capacity of the cooling jacket can be improved.

[0003] For ordinary petrochemical reaction processes, the cylinder needs to meet the heat exchange requirements, and the roundness requirement for the inner wall of the cylinder is not high. Even if it is moderately deformed after working for a period of time, it is still within an acceptable range. However, in chemical reactions of condensation and crystallization, such as Chinese patent documents with publication numbers CN206008091, CN112316476A, CN204637634U, CN203244806U, CN115038515A, etc., all disclose the technology of setting a rotating scraper (scraper knife) inside the cylinder to scrape off the crystals on the inner wall of the cylinder. In practice, the crystallizer of PX (p-xylene) is also like this.

[0004] Existing Problems

[0005] (1) The scraper will exert a large extrusion force on the inner wall of the cylinder. On the one hand, the inner wall of the cylinder will be deformed by extrusion, which will affect the strength of the cylinder. On the other hand, the deformation of the cylinder will change the roundness or the integrity of the circle, and thus will change the gap between the scraper and the inner wall (roundness refers to the degree to which the cross-section of a workpiece approaches a theoretical circle. When the difference between the maximum radius and the minimum radius is zero, the roundness is zero. The measuring tool is a roundness instrument, and its use is to measure the roundness of annular workpieces), reducing the scraping efficiency.

[0006] (2) The existing cooling jacket is tightly spirally arranged on the outer side of the cylinder, and the spiral welding is difficult. Moreover, almost the entire outer side of the cylinder is covered by the cooling jacket. It is only possible to adjust the roundness of the cylinder from the inside during the processing and manufacturing stage of the heat exchanger. It is difficult to adjust the roundness of the cylinder from the outside across the cooling jacket after it is put into use.

[0007] (3) To provide the strength of the cylinder body, reduce deformation and maintain roundness, the conventional technical means is to increase the thickness of the cylinder body. However, this will reduce the heat exchange efficiency and it is difficult to balance the high heat exchange efficiency of the thin-walled cylinder body and the high strength to prevent roundness deformation. Summary of the Invention

[0008] In view of the above technical problems existing in the prior art, the present invention provides a jacket heat exchanger with adjustable inner roundness.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] Provide a jacket heat exchanger with adjustable inner roundness, including a cylindrical body and a heat exchange jacket. The feature is that: the heat exchange jacket includes a semi-circular tube group circumferentially distributed around the outer wall of the cylindrical body. A plurality of semi-circular pipes in the semi-circular tube group are axially distributed along the cylindrical body. A welding band fixed to the outer wall of the cylindrical body is provided between adjacent two semi-circular pipes. Each welding band includes a plurality of welding parts spaced along the axial direction of the cylindrical body. An overflow channel is formed between the upper and lower adjacent welding parts, so that a plurality of semi-circular pipes communicate with each other;

[0011] The jacket heat exchanger further includes a roundness adjusting device. The roundness adjusting device includes a support frame fixed on the outer side of the heat exchange jacket and a plurality of adjusting columns installed on the support frame and circumferentially distributed and separated on the outer side of the heat exchange jacket. The plurality of adjusting columns are adjustably connected to the support frame to indirectly extrude the side wall of the cylindrical body by pressing against the welding band to different degrees.

[0012] As a further optional solution, the support frame is in a circular ring shape, and the plurality of adjusting columns are arranged uniformly or non-uniformly around the support frame.

[0013] As a further optional solution, the central axis of the adjusting column coincides with the radial direction of the cylindrical body.

[0014] As a further optional solution, the number of the roundness adjusting devices is multiple, and the multiple roundness adjusting devices are arranged along the axial direction of the cylindrical body.

[0015] As a further optional solution, the adjusting column is an activity riveting structure, and the support frame is fixed with a nut through which the adjusting column is threaded.

[0016] As a further optional solution, an elastic pad structure is provided at the end of the adjusting column, and the adjusting column indirectly presses against the welding band by pressing against the gasket.

[0017] As a further optional solution, the elastic pad structure is a V-shaped metal strip, and both sides of the elastic pad structure abut against the outer walls of adjacent two semi-circular pipes, and the adjusting column abuts against the opening of the elastic pad structure; or the elastic pad structure is a washer.

[0018] As a further alternative, the roundness adjusting device further includes a supporting seat disposed outside the heat exchange jacket, and the supporting frame is fixed to the cylindrical body through the supporting seat.

[0019] As a further alternative, the number of supporting seats corresponding to each roundness adjusting device is multiple, and the multiple supporting seats are arranged around the cylindrical body evenly or unevenly, and the adjusting columns are arranged between every two adjacent supporting seats.

[0020] As a further alternative, a welding structure is provided between the adjusting column and the supporting frame and / or between the adjusting column and the heat exchange jacket. After rotating and adjusting the degree to which the adjusting column abuts against the welding belt, the welding structure welds and fixes the adjusting column.

[0021] Advantages of the present invention:

[0022] A jacket heat exchanger with adjustable inner roundness of the present invention has the following advantages:

[0023] (1) The semi-circular pipes of the heat exchange jacket are distributed along the axial direction of the cylindrical body, and the straight welding is less difficult. Moreover, the welding belt is in contact with the cylindrical body, providing conditions for adjusting the roundness of the cylindrical body from the outside.

[0024] (2) Since the multiple adjusting columns of the roundness adjusting device are connected to the supporting frame and indirectly abut against the side wall of the cylindrical body by abutting against the welding belt of the heat exchange jacket, the strength of the cylindrical body is enhanced on the basis of not changing the original wall thickness to ensure the heat exchange efficiency, and it is not easy to deform under the internal extrusion force.

[0025] (3) The multiple adjusting columns are adjustably connected to the supporting frame. During installation, the multiple adjusting columns are operated to abut against the outer wall of the cylindrical body to different degrees to adjust the circularity of the inner wall of the cylindrical body; even after the heat exchanger has worked for a period of time, the adjusting columns can be operated again for adjustment according to needs, and the maintenance is convenient. Brief Description of the Drawings

[0026] Figure 1 It is a schematic structural diagram of a jacket heat exchanger with adjustable inner roundness in the embodiment.

[0027] Figure 2 It is a schematic diagram of the distribution of multiple roundness adjusting devices on the outside of the cylindrical body in the embodiment.

[0028] Figure 3 It is a schematic structural diagram of the heat exchange jacket in the embodiment.

[0029] Figure 4 It is a schematic diagram of a semi-finished product of the heat exchange jacket in the embodiment.

[0030] Reference Signs:

[0031] Cylindrical body 1;

[0032] Circularity adjusting device 2, support frame 21, adjusting column 22, nut 23, gasket 24, and supporting seat 25.

[0033] Heat exchange jacket 3, semi-circular tube group 31, semi-circular pipe 32, welding strip 33, welding part 331, and flow-through channel 332;

[0034] Confluence pipe 4, scraper 5. Specific embodiments

[0035] The present invention will be described in detail below in conjunction with specific embodiments and the accompanying drawings.

[0036] An inner roundness adjustable jacket heat exchanger according to this embodiment, as Figures 1 to 3 shown, includes a cylindrical body 1 and a heat exchange jacket 3. In actual application, a rotatable scraper 5 is provided inside the cylindrical body 1, and the scraper 5 is in clearance fit with the inner wall of the cylindrical body 1 to scrape the materials on the inner wall of the cylindrical body 1. The heat exchange jacket 3 includes a semi-circular tube group 31 circumferentially distributed around the outer wall of the cylindrical body 1. A plurality of semi-circular pipes 32 of the semi-circular tube group 31 are axially distributed along the cylindrical body 1. A welding strip 33 fixed to the outer wall of the cylindrical body 1 is provided between adjacent two semi-circular pipes 32. Each welding strip 33 includes a plurality of welding parts 331 (i.e., Figure 3 the black-filled parts in Figure 4 shown) spaced along the axis of the cylindrical body 1. A flow-through channel 332 is formed between the upper and lower adjacent two welding parts 331, so that a plurality of semi-circular pipes 32 communicate with each other. The welding parts 331 of adjacent two welding strips 33 are arranged staggeredly. Confluence pipes 4 are respectively provided at the upper and lower parts of the cylindrical body 1, and both ends of a plurality of semi-circular tubes are respectively communicated with the corresponding confluence pipes 4. During actual processing, first, a plurality of semi-circular bending bodies as shown in

[0037] shown are punched out from a thin steel plate, and then they are fixedly wrapped outside the cylindrical body 1. The section where the roots of adjacent two semi-circular bending bodies are connected is the position of the welding strip 33.

[0038] In this embodiment, an elastic pad structure is provided at the end of the adjusting column 22, which can specifically be a gasket 24, a washer or other structures. The adjusting column 22 indirectly presses against the welding part 331 of the welding strip 33 by pressing against the gasket 24. The area of the gasket 24 is much larger than the end face area of the adjusting column 22, expanding the area of pressing against the cylindrical body 1. The gasket 24 is a V-shaped metal strip, and both sides of the gasket 24 abut against the outer walls of two adjacent semi-circular pipes 32, thus fitting snugly against the outer side wall of the heat exchange jacket 3. The adjusting column 22 presses against the opening of the gasket 24.

[0039] In this embodiment, the central axes of the adjusting columns 22 coincide with the radial direction of the cylindrical body 1, and the adjusting columns 22 press and adjust towards the radial direction of the cylindrical body 1 to prevent the cylindrical body 1 from undergoing unexpected deformation.

[0040] In this embodiment, the roundness adjusting device 2 further includes a plurality of supporting seats 25. The supporting seats 25 are in the shape of a flared U. The two ends of the supporting seats 25 are welded and fixed to the welding part 331, and the support frame 21 is fixed to the heat exchange jacket 3 through the supporting seats 25. In practice, a supporting structure can be additionally provided beside the heat exchanger to support the support frame 21. The plurality of supporting seats 25 are arranged uniformly or non-uniformly around the cylindrical body 1, and an adjusting column 22 is arranged between every two adjacent supporting seats 25.

[0041] Furthermore, a welding structure is provided between the adjusting column 22 and the nut 23 of the support frame 21. After rotating the adjusting column 22 to adjust the ideal degree of pressing against the welding part 331, the adjusting column 22 is firmly welded and fixed to enhance the stability of the cylindrical body 1 after adjustment. Similarly, in practice, a welding structure can also be provided between the adjusting column 22 and the heat exchange jacket 3.

[0042] During installation, by observing whether the gap between the scraper inside the cylindrical body 1 and the inner wall of the cylindrical body 1 is too large or too small, and then rotating multiple adjusting columns 22 to press against the outer wall of the heat exchange jacket 3 to different degrees, the roundness of the inner wall of the cylindrical body 1 is adjusted to ensure a finer fit between the inner wall of the cylindrical body 1 and the scraper inside it, improving the scraping efficiency. Even after the heat exchanger has been working for a period of time, if there is a problem that the gap between the scraper and the inner wall of the cylindrical body 1 does not meet the requirements, the welding structure can be damaged and the adjusting column 22 can be turned again for adjustment. Moreover, the roundness adjusting device 2 remains installed outside the heat exchange jacket 3, enhancing the strength of the cylindrical body 1 on the basis of not changing the original wall thickness of the cylindrical body 1 to ensure the heat exchange efficiency.

[0043] In the description of the present invention, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] The standard parts used in the present invention can all be purchased from the market. The special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part all adopt conventional means such as bolts, rivets, and welding that are mature in the prior art. The machines, parts, and equipment all adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be elaborated here.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

[0046] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A jacket heat exchanger with adjustable inner roundness, comprising a cylindrical body and a heat exchange jacket, characterized in that: The heat exchange jacket includes a semi-circular tube group circumferentially distributed around the outer wall of the cylinder body. A plurality of semi-circular pipes in the semi-circular tube group are axially distributed along the cylinder body. A welding strip fixed to the outer wall of the cylinder body is provided between adjacent two semi-circular pipes. Each welding strip includes a plurality of welding parts spaced along the axial direction of the cylinder body. An overflow channel is formed between two adjacent welding parts up and down, so that a plurality of semi-circular pipes communicate with each other. The jacket heat exchanger further includes a circularity adjusting device. The circularity adjusting device includes a support frame fixed on the outer side of the heat exchange jacket and a plurality of adjusting columns installed on the support frame and circumferentially distributed around the outer side of the heat exchange jacket. The plurality of adjusting columns are adjustably connected to the support frame to indirectly extrude the side wall of the cylinder body by pressing against the welding strip to different degrees.

2. The jacket heat exchanger with adjustable inner roundness according to claim 1, wherein: The support frame is in a circular ring shape, and the plurality of adjusting columns are arranged evenly or unevenly around the support frame.

3. A jacket heat exchanger with adjustable inner roundness according to claim 1 or 2, characterized in that: The central axis of the adjusting column coincides with the radial direction of the cylinder body.

4. The jacket heat exchanger with adjustable inner roundness according to claim 1, characterized in that: The number of the circularity adjusting devices is multiple, and the multiple circularity adjusting devices are arranged along the axial direction of the cylinder body.

5. The jacket heat exchanger with adjustable inner roundness according to claim 1, characterized in that: The adjusting column is an activity riveting structure, and a nut through which the adjusting column passes in a threaded manner is fixed on the support frame.

6. The jacket heat exchanger with adjustable inner roundness according to claim 1 is characterized in that: An elastic pad structure is arranged at the end of the adjusting column, and the adjusting column indirectly presses against the welding strip by pressing against the elastic pad structure.

7. The jacket heat exchanger with adjustable inner roundness according to claim 6, characterized in that: The elastic pad structure is a V-shaped metal strip, and both sides of the elastic pad structure abut against the outer walls of two adjacent semi-circular pipes, and the adjusting column abuts against the opening of the elastic pad structure; or the elastic pad structure is a washer.

8. The jacket heat exchanger with adjustable inner roundness according to claim 1, characterized in that: The circularity adjusting device further includes a supporting seat arranged on the outer side of the heat exchange jacket, and the support frame is fixed to the cylinder body through the supporting seat.

9. The jacket heat exchanger with adjustable inner roundness according to claim 8, characterized in that: The number of the supporting seats corresponding to each circularity adjusting device is multiple, and the multiple supporting seats are arranged evenly or unevenly around the cylinder body, and the adjusting column is arranged between every two adjacent supporting seats.

10. The jacket heat exchanger with adjustable inner roundness according to claim 1, characterized in that: A welding structure is provided between the adjusting column and the support frame and / or between the adjusting column and the heat exchange jacket. After rotating and adjusting the degree of the adjusting column pressing against the welding strip, the welding structure welds and fixes the adjusting column.

Images