Falling film reboiler

Abstract

The utility model belongs to the technical field of reboilers, and discloses a falling film reboiler, which comprises a cylinder, an upper seal head and a lower seal head, a heat exchange tube is arranged in the cylinder through a tube plate, an air inlet is arranged on the upper seal head, a high-boiling residue outlet is arranged on the lower seal head, and the lower seal head is provided with a high-boiling residue outlet. A feed port, an emptying port, a thermal medium inlet, a thermal medium outlet, a discharge port and an emptying port are formed in the cylinder body; the device further comprises a double-layer distributor, a pressure balance pipe and an air hole. According to the improved distributor, materials can be uniformly distributed and flow into the heat exchange tubes, ideal liquid film thickness is formed, liquid is uniformly discharged, the gasification rate is ensured, the materials are prevented from going bad, and the heat exchange efficiency is improved; the machining difficulty and the installation difficulty are reduced, the machining efficiency of the equipment is improved, and the reduction of the equipment performance caused by the installation horizontal error is also reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of reboilers, in particular to a falling film reboiler. Background Art

[0002] Falling film reboiler is a kind of equipment used for evaporation separation, which is often used for heat-sensitive materials. Due to the heat sensitivity of the materials, they cannot be heated for a long time at the operating temperature, so falling film reboiler is used. The working process of falling film reboiler is as follows: the liquid from the bottom of the tower is sent to the top of the falling film reboiler by means of a pump, distributed on the tube sheet, and pushed downward by gravity to flow on the tube wall to form a liquid film and vaporize. Since the material flows downward, it is suitable for processing solid-containing materials. Its disadvantage is that a distributor needs to be set at the entrance of the tube, which requires a large investment, high operating costs, and a high repair rate.

[0003] The existing falling film reboiler generally adopts the traditional liquid distribution plate, which mainly includes tooth type, guide tube type and single plate type. The disadvantage is that the processing accuracy of the liquid downcomer of the distribution plate is high, and the distribution plate and the cylinder must be kept absolutely level during the welding process. Otherwise, it will cause liquid deviation and uneven distribution during the production process, resulting in excessive liquid film thickness in some downcomer main pipes and some downcomer pipes, affecting the heat exchange effect of the reboiler. If the material stays too long under a certain operating temperature condition, coking will occur and block the inner wall of the heat exchange tube. Utility Model Content

[0004] In order to solve the above technical problems, the utility model provides a falling film reboiler. The technical solution adopted by the utility model is as follows:

[0005] A falling film reboiler comprises a cylinder, an upper end cap and a lower end cap, wherein heat exchange tubes are arranged in the cylinder through an upper tube sheet and a lower tube sheet, an air inlet is arranged on the upper end cap, a high boiling point outlet is arranged on the lower end cap, and a feed inlet, a venting port, a heat medium inlet, a heat medium outlet, a discharge port and a drain port are arranged on the cylinder;

[0006] It also includes a double-layer distributor, which is arranged in the cylinder and lower than the feed port. The double-layer distributor includes an upper distribution plate and a lower distribution plate. The upper distribution plate is evenly provided with a plurality of upper distribution holes, and the lower distribution plate is provided with a plurality of lower distribution holes. The upper distribution holes and the lower distribution holes are staggered with each other, and the lower distribution holes and the tube sheet holes of the upper tube sheet are staggered with each other. The aperture of the upper distribution hole is smaller than the aperture of the tube sheet hole, and the aperture of the lower distribution hole is smaller than the aperture of the upper distribution hole; a pressure balance pipe is penetrated by the upper distribution plate and the lower distribution plate, and the pressure balance pipe is provided with air holes.

[0007] The falling film reboiler provided by the utility model comprises a double-layer distributor, wherein the upper and lower distribution plates are provided with a plurality of distribution holes which are distributed in an interlaced manner, and a pressure balance pipe is provided. The distributor designed and modified by the utility model can evenly distribute the material into the heat exchange tube, thereby forming an ideal liquid film thickness, evenly discharging the liquid, ensuring the gasification rate, avoiding material deterioration, and improving the heat exchange efficiency; the difficulty of processing and installation is reduced, the processing efficiency of the equipment is improved, and the reduction of equipment performance caused by installation level errors is reduced.

[0008] Furthermore, the upper distribution holes and the lower distribution holes are arranged in a corner triangle arrangement.

[0009] Furthermore, the diameter of the upper distribution holes is 20-30 mm.

[0010] Furthermore, the diameter of the lower distribution holes is 10-20 mm.

[0011] Furthermore, a nozzle is provided at the discharge end of the feed port.

[0012] The utility model provides a falling film reboiler. The design of the distributor can evenly distribute the material into the heat exchange tube, form an ideal liquid film with uniform thickness, ensure the gasification rate, avoid material deterioration, and improve the heat exchange efficiency; and reduce the difficulty of processing and installation, improve the processing efficiency of the equipment, and reduce the reduction of equipment performance due to installation level error. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the falling film reboiler of the utility model;

[0014] Figure 2 For this utility model Figure 1 A magnified schematic diagram;

[0015] Figure 3 It is a structural schematic diagram of the upper distribution plate of the utility model;

[0016] Figure 4 This is a schematic diagram of the structure of the lower distribution plate of the utility model;

[0017] Figure 5 It is a schematic diagram of the positions of the upper distribution holes, lower distribution holes and tube sheet holes of the utility model.

[0018] Description of the markings in the figure:

[0019] 1. Cylinder; 2. Upper head; 3. Lower head; 4. Air inlet; 5. High boiling material outlet; 6. Feed inlet; 7. Vent; 8. Heat medium outlet; 9. Heat medium inlet; 10. Drain port; 11. Upper distribution plate; 12. Lower distribution plate; 13. Pressure balance pipe; 14. Air vent; 15. Upper distribution hole; 16. Lower distribution hole; 17. Tube sheet hole; 18. Nozzle; 19. Discharge port; 20 Upper tube sheet; 21 Lower tube sheet. DETAILED DESCRIPTION

[0020] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings.

[0021] Example:

[0022] like Figure 1-Figure 5 As shown, a falling film reboiler comprises a cylinder 1, an upper head 2 and a lower head 3, wherein heat exchange tubes are arranged in the cylinder 1 through an upper tube sheet 20 and a lower tube sheet 21, an air inlet 4 is arranged on the upper head 2, a high boiling material outlet 5 is arranged on the lower head 3, and a feed port 6, a vent port 7, a heat medium inlet 9, a heat medium outlet 8, a discharge port 19, a drain port 10 and a double-layer distributor are arranged on the cylinder 1. The double-layer distributor is arranged in the cylinder 1 and is lower than the feed port 6. The double-layer distributor includes an upper distribution plate 11 and a lower distribution plate 12. The upper distribution plate 11 is evenly provided with a plurality of upper distribution holes 15, and the lower distribution plate 12 is provided with a plurality of lower distribution holes 16. The upper distribution holes 15 and the lower distribution holes 16 are arranged in a regular triangle arrangement. The upper distribution holes 15 and the lower distribution holes 16 are staggered with each other, and the lower distribution holes 16 and the tube sheet holes 17 of the upper tube sheet 20 are staggered with each other. The aperture of the upper distribution hole 15 is smaller than the aperture of the tube sheet hole 17, and the aperture of the lower distribution hole 16 is smaller than the aperture of the upper distribution hole 15. In this embodiment, the aperture of the upper distribution hole 15 is 25 mm, and the aperture of the lower distribution hole 16 is 15 mm. The hole spacing between the upper distribution holes 15 is 37 mm, and the hole spacing between the lower distribution holes 16 is 37 mm. A pressure balancing pipe 13 is provided through the upper distribution plate 11 and the lower distribution plate 12. In the present embodiment, the diameter of the pressure balancing pipe 13 is 89 mm. An air hole 14 is provided on the pressure balancing pipe 13. In the present embodiment, the diameter of the air hole 14 is 10 mm. In order to distribute the material more evenly, a nozzle 18 is provided at the discharge end of the feed port 6.

[0023] The falling film reboiler provided by the utility model comprises a double-layer distributor, wherein the upper and lower distribution plates are provided with a plurality of distribution holes which are distributed in an interlaced manner, and a pressure balance pipe is provided. The distributor designed and modified by the utility model can evenly distribute the material into the heat exchange tube, forming an ideal liquid film with uniform thickness, thereby ensuring the gasification rate, avoiding material deterioration, and improving the heat exchange efficiency; the difficulty of processing and installation is reduced, the processing efficiency of the equipment is improved, and the reduction of equipment performance caused by installation level errors is also reduced.

[0024] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A falling film reboiler, comprising a cylinder, an upper head and a lower head, wherein the cylinder is provided with heat exchange tubes through an upper tube sheet and a lower tube sheet, an air inlet is provided on the upper head, a high boiling point outlet is provided on the lower head, and a feed inlet, a venting port, a heat medium inlet, a heat medium outlet, a discharge port and a drain port are provided on the cylinder; characterized in that: It also includes a double-layer distributor, which is arranged in the cylinder and lower than the feed port. The double-layer distributor includes an upper distribution plate and a lower distribution plate. The upper distribution plate is evenly provided with a plurality of upper distribution holes, and the lower distribution plate is evenly provided with a plurality of lower distribution holes. The upper distribution holes and the lower distribution holes are staggered with each other, and the lower distribution holes and the tube sheet holes of the upper tube sheet are staggered with each other. The aperture of the upper distribution hole is smaller than the aperture of the tube sheet hole, and the aperture of the lower distribution hole is smaller than the aperture of the upper distribution hole; a pressure balance pipe is penetrated by the upper distribution plate and the lower distribution plate, and the pressure balance pipe is provided with a vent hole.

2. The falling film reboiler according to claim 1, characterized in that: The upper distribution holes and the lower distribution holes are arranged in a corner triangle arrangement.

3. The falling film reboiler according to claim 1, characterized in that: The aperture of the upper distribution holes is 20-30 mm.

4. The falling film reboiler according to claim 1, characterized in that: The aperture of the lower distribution holes is 10-20 mm.

5. The falling film reboiler according to claim 1, characterized in that: A nozzle is arranged at the discharge end of the feed port.

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