CN214065808U

CN214065808U - Heat exchanger and pentanediol distillation system

Info

Publication number: CN214065808U
Application number: CN202022866001.8U
Authority: CN
Inventors: 周明何; 周兆昌; 周俊; 周邦福; 张金全; 周火琴
Original assignee: Zhejiang Boadge Chemical Co ltd
Current assignee: Zhejiang Boadge Chemical Co ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2021-08-27
Anticipated expiration: 2030-12-03

Abstract

The utility model discloses a heat exchanger, which relates to the technical field of chemical equipment, and comprises a heat exchanger used for a pentanediol distillation system, and is characterized by comprising a shell, a first seal head positioned on one side of the shell and a second seal head positioned on the other side of the shell; the shell is provided with a U-shaped expansion joint along the axial direction, and the U-shaped expansion joint comprises more than one U-shaped part which are sequentially connected. The utility model also provides a pentanediol distillation system, including a heat exchanger, still include distillation column reboiler, distillation column and backwash tank, distillation column reboiler export and distillation column entry intercommunication, the first entry intercommunication of distillation column export and heat exchanger, the first export of heat exchanger and backwash tank entry intercommunication, the backwash tank export divide into first branch road and second branch road, first branch road and distillation column intercommunication, second branch road and bin intercommunication. The technical effect of the utility model lies in that it makes the inside water shortage district that does not exist of device, guarantees that temperature difference stress is even, makes the difficult fracture of welding seam.

Description

Heat exchanger and pentanediol distillation system

Technical Field

The utility model relates to a chemical industry equipment technical field, concretely relates to heat exchanger and pentanediol distillation system.

Background

Pentanediol, a colorless transparent liquid, is soluble in organic solvents such as alcohols, ethers and ethyl acetate, and is commonly used as an organic synthesis intermediate for the manufacture of polyesters, polyethers and perfumes.

However, the heat exchanger in the relevant preparation system for the pentanediol is in a single-pass mode, cooling water enters from left and exits from right, two water shortage areas are formed at the welding seam between the tube plate and the tube array, the welding seam in the area is subjected to the drastic change of temperature difference stress, equipment is damaged due to the cracking of the welding seam, repair is often needed, production is affected, and cost is increased.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The technical problem to the easy fracture of the welding seam in the water shortage district among the one-way heat exchanger, the utility model provides a heat exchanger and pentanediol distillation system, it makes the inside no water shortage district that does not exist of device, guarantees that the difference in temperature stress is even, makes the difficult fracture of welding seam.

2. Technical scheme

In order to solve the above problem, the utility model provides a technical scheme does:

a heat exchanger is used for a pentanediol distillation system and comprises a shell, a first end socket and a second end socket, wherein the first end socket is positioned on one side of the shell, and the second end socket is positioned on the other side of the shell;

the shell is provided with a U-shaped expansion joint along the axial direction, and the U-shaped expansion joint comprises more than one U-shaped part which are sequentially connected;

a first inlet is formed in one end of the shell, a first outlet is formed in the other end of the shell, tubes are uniformly distributed in the shell along the axial direction, tube arrays for supporting the tubes are arranged on two sides of the shell, and one ends of the tubes are communicated with the second seal head;

the lower end of the first seal head is provided with a second inlet, the upper end of the first seal head is provided with a second outlet, and a partition board which is distributed along the axial direction is arranged in the first seal head so as to divide the first seal head into a first seal head I and a second seal head II; the other end of the tube array positioned on one side of the axis of the partition plate is communicated with the first sealing head; the other end of the tube array positioned on the other side of the axis of the clapboard is communicated with the second first seal head;

the first seal head and the shell connecting part and the second seal head and the shell connecting part are provided with sealing rings.

Optionally, the radius of the turn of the U-shaped portion is greater than or equal to 3 times of the wall thickness of the U-shaped expansion joint.

Optionally, the U-shaped expansion joint and the shell are integrally formed.

Optionally, the inner wall of the second end socket is provided with a heat insulation layer.

Optionally, the number of the tubes is increased from top to bottom and then decreased.

Optionally, the material of the partition plate is stainless steel.

Optionally, the sealing ring is a fluorine-coated O-shaped sealing ring, the fluorine-coated O-shaped sealing ring includes an outer coating layer and an inner core layer, the outer coating layer wraps the outer side of the inner core layer, the outer coating layer is made of polytetrafluoroethylene, and the inner core layer is made of elastic rubber.

Optionally, the strake is a circular plate with a matched shell cross section, and the strake comprises two semicircles, and the semicircular cross sections are respectively provided with a groove and a protrusion which are matched with each other.

The utility model provides a pentanediol distillation system, includes a heat exchanger, still includes distillation column reboiler, distillation column and backwash tank, distillation column reboiler export with distillation column entry intercommunication, the distillation column export with the first entry intercommunication of heat exchanger, the first export of heat exchanger with backwash tank entry intercommunication, the backwash tank export is divided into first branch road and second branch road, first branch road and distillation column intercommunication, second branch road and bin intercommunication, the backwash tank is located the heat exchanger lower extreme, the bin is located the backwash tank lower extreme.

Optionally, the first branch and the second branch are both provided with a manual valve.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect: it makes the inside lack of water district of device, guarantees that the temperature difference stress is even.

Drawings

Fig. 1 is a schematic structural diagram of a heat exchanger according to an embodiment of the present invention;

fig. 2 is a schematic diagram of a pentanediol distillation system according to an embodiment of the present invention.

In the figure: 1. a housing; 2. a first end enclosure; 21. a first seal head; 22. a second first end enclosure; 3. a second end enclosure; 4. a U-shaped expansion joint; 41. a U-shaped portion; 5. a first inlet; 6. a first outlet; 7. arranging pipes; 8. a strake; 9. a second inlet; 10. A second outlet; 11. a partition plate; 12. a seal ring; 13. a heat preservation and insulation layer.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings. The utility model discloses in words such as first, second, be for the description the utility model discloses a technical scheme is convenient and set up, and does not have specific limiting action, is general finger, right the technical scheme of the utility model does not constitute limiting action. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art. The technical solutions in the same embodiment and between the technical solutions in different embodiments can be arranged and combined to form a new technical solution without contradiction or conflict, which is all within the scope of the present invention.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

With reference to fig. 1-2, the present invention provides a heat exchanger for a pentanediol distillation system, comprising a housing 1, a first end enclosure 2 located at one side of the housing 1, and a second end enclosure 3 located at the other side of the housing 1;

the shell 1 is provided with a U-shaped expansion joint 4 along the axial direction, and the U-shaped expansion joint 4 comprises more than one U-shaped part 41 which are connected in sequence;

a first inlet 5 is formed in one end of the shell 1, a first outlet 6 is formed in the other end of the shell 1, the tubes 7 are uniformly distributed in the shell 1 along the axial direction, the two sides of the shell 1 are provided with tube arrays 8 for supporting the tubes 7, and one ends of the tubes 7 are communicated with the second seal head 3;

a second inlet 9 is formed in the lower end of the first seal head 2, a second outlet 10 is formed in the upper end of the first seal head 2, and a partition plate 11 which is distributed along the axial direction is arranged in the first seal head 2 so as to divide the first seal head 2 into a first seal head 21 and a second seal head 22; the other end of the tube array 7 positioned on one side of the axis of the clapboard 11 is communicated with a first seal head 21; the other end of the tube array 7 positioned on the other side of the axis of the clapboard 11 is communicated with the second first seal head 22;

and sealing rings 12 are arranged at the joint of the first seal head 2 and the shell 1 and the joint of the second seal head 3 and the shell 1.

During specific work, cooling water enters the first sealing head 21 from the second inlet 9, then sequentially passes through the tube nest 7, the second sealing head 3, the tube nest 7 and the first sealing head two 22, finally is discharged from the second outlet 10, meanwhile, gas pentanediol enters the shell 1 from the first inlet 5, the gas pentanediol is liquefied into liquid pentanediol through the tube nest 7 containing the cooling water, and the liquid pentanediol is finally discharged from the first outlet 6. This heat exchanger has increased U type expansion joint 4 in the middle part of tubulation 7, when having the difference in temperature, can guarantee that casing 1 has the space of freely stretching out and drawing back, makes the difference in temperature stress even, and U type portion 41 can be one or more, can guarantee when the difference in temperature is great, also can make casing 1 freely stretch out and draw back, prevents that the casing from being destroyed because of the inflation. The heat exchanger is double-pass, so that the welding seam area welded by the strake 8 and the shell and tube 7 is full of water flow, and the water shortage area does not exist, so that the welding seam is not easy to crack.

Specifically, in order to increase the strength of the U-shaped expansion joint 4 and increase the service life of the U-shaped expansion joint, the radius of the turning part of the U-shaped part 41 is greater than or equal to 3 times of the wall thickness of the U-shaped expansion joint 4, so that the expansion joint is ensured to have a certain elastic compensation amount, otherwise, the wall thickness is too large, which causes the rigidity to increase and the flexibility to decrease until the expansion joint fails.

Specifically, in order to prevent the joint of the U-shaped expansion joint 4 and the shell 1 from cracking and increase the service life of the heat exchanger, the U-shaped expansion joint 4 and the shell 1 are integrally formed.

Specifically, in order to maintain the temperature of the cooling water, the inner wall of the second end socket 3 is provided with a heat insulation layer 13.

Specifically, in order to ensure that the gaps between the tubes 7 are equal, the number of the tubes 7 is increased from top to bottom and then decreased.

Specifically, in order that the partition plate 11 rusts in the cooling water for a long time, the material of the partition plate 11 is stainless steel.

Specifically, in order to increase the sealing performance of the heat exchanger, the sealing ring 12 is a fluorine-coated O-shaped sealing ring 12, the fluorine-coated O-shaped sealing ring 12 comprises an outer coating layer and an inner core layer, the outer coating layer is wrapped on the outer side of the inner core layer, the outer coating layer is made of polytetrafluoroethylene, and the inner core layer is made of elastic rubber.

Specifically, for the ease of dismouting, and connect reliably, strake 8 is the circular slab of casing cross-section adaptation, and strake 8 includes two semicircles, and the semicircle cross-section is equipped with the recess and the arch of mutually supporting respectively.

The utility model also provides a pentanediol distillation system, including a heat exchanger, still include the distillation column reboiler, distillation column and backwash tank, distillation column reboiler export and distillation column entry intercommunication, the first entry 5 intercommunications of distillation column export and heat exchanger, the first export of heat exchanger 6 and backwash tank entry intercommunication, the backwash tank export divide into first branch road and second branch road, first branch road and distillation column intercommunication, second branch road and bin intercommunication, the backwash tank is located the heat exchanger lower extreme, the bin is located the backwash tank lower extreme.

During specific application, raw materials sequentially pass through a distillation tower reboiler and a distillation tower, solid particle impurities in the raw materials are removed to obtain gas pentanediol, the gas pentanediol is liquefied into liquid pentanediol through a heat exchanger, then the liquid pentanediol flows into a reflux groove, then one part of the liquid pentanediol flows into the distillation tower through a first branch circuit in a backflow mode to be continuously distilled, and the other part of the liquid pentanediol flows into a storage tank through a second branch circuit, wherein the reflux groove is located at the lower end of the heat exchanger, the storage tank is located at the lower end of the reflux groove, a water pump can be reduced, and distillation cost is saved.

Specifically, in order to control the switches of the first branch and the second branch at any time, the first branch and the second branch are both provided with manual valves.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. A heat exchanger is used for a pentanediol distillation system and is characterized by comprising a shell, a first end socket and a second end socket, wherein the first end socket is positioned on one side of the shell, and the second end socket is positioned on the other side of the shell;

2. The heat exchanger of claim 1, wherein the U-turn radius is equal to or greater than 3 times the U-expansion joint wall thickness.

3. A heat exchanger according to claim 2 wherein the U-shaped expansion joint and the housing are integrally formed.

4. The heat exchanger according to claim 1, wherein the inner wall of the second head is provided with a heat insulation layer.

5. A heat exchanger according to claim 1 wherein the number of tubes increases from top to bottom and decreases.

6. A heat exchanger according to claim 1, wherein the material of the partition is stainless steel.

7. The heat exchanger according to claim 1, wherein the seal ring is a fluorine-coated O-ring, the fluorine-coated O-ring comprises an outer coating layer and an inner core layer, the outer coating layer is wrapped outside the inner core layer, the outer coating layer is made of polytetrafluoroethylene, and the inner core layer is made of elastic rubber.

8. The heat exchanger according to claim 1, wherein the strake is a circular plate with a matched shell cross section, and the strake comprises two semicircles, and the semicircular cross section is respectively provided with a groove and a protrusion which are matched with each other.

9. A pentanediol distillation system comprising a heat exchanger according to any one of claims 1 to 8, further comprising a distillation column reboiler, a distillation column, and a reflux drum, wherein the distillation column reboiler outlet communicates with the distillation column inlet, the distillation column outlet communicates with the heat exchanger first inlet, the heat exchanger first outlet communicates with the reflux drum inlet, the reflux drum outlet is divided into a first branch and a second branch, the first branch communicates with the distillation column, the second branch communicates with a storage tank, the reflux drum is located at the lower end of the heat exchanger, and the storage tank is located at the lower end of the reflux drum.

10. A pentanediol distillation system according to claim 9, wherein each of said first branch and said second branch is provided with a manual valve.