A falling film reboiler

Abstract

This utility model discloses a falling film reboiler, including an upper tube box, a tube sheet connected to the bottom of the upper tube box, a distribution plate inside the upper tube box connected to the upper end face of the tube sheet, a plurality of liquid inlet slots evenly opened at the bottom of the distribution plate, a feed pipe connected to the side wall of the upper tube box, the feed pipe communicating with the inside of the tube box, a plurality of heat exchange tubes vertically connected to the lower end of the tube sheet, a film distributor connected to the upper end of the heat exchange tubes, the upper and lower ends of the film distributor being a liquid inlet and a connecting part, respectively, the liquid inlet extending into the cavity of the distribution plate, the connecting part inserted into the upper end of the heat exchange tubes, the liquid inlet having a first layer of tangential windows and a second layer of tangential windows from bottom to top. This application has a compact structure, is easy to operate, has high heat transfer efficiency, a wide operating load range, is not prone to short circuits, and can achieve good film distribution in the range of 50% to 140% of the circulating flow rate.

Description

Technical Field

[0001] This utility model relates to the technical field of falling film reboilers, and more specifically, to a falling film reboiler. Background Technology

[0002] Falling film heat exchangers are widely used in pharmaceuticals, food processing, chemicals, environmental protection, and energy. A falling film heat exchanger adds a liquid film-forming device to a conventional heat exchanger, forming a falling film structure including a film distribution device and heat exchange tubes. The liquid enters the heat exchange tubes through the film distribution device, which acts as a flow guide. Influenced by the structure of the film distribution device, the liquid flows along a specific streamline, quickly covering the inner wall of the heat exchange tubes to form a liquid film. This film is maintained and flows downwards along the heat exchange tubes, exchanging heat with the fluid outside the tubes during this flow. In traditional falling film heat exchangers, during feeding, the liquid tends to flow directly into the center of the heat exchange tubes, leading to uneven liquid film distribution and a "short-circuit" phenomenon, severely affecting heat transfer efficiency and limiting the operating load range. Utility Model Content

[0003] In view of the above-mentioned technical problems in related technologies, this utility model provides a falling film reboiler that can solve the above problems.

[0004] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows: A falling film reboiler includes an upper tube box, a tube sheet connected to the bottom of the upper tube box, a distribution plate inside the upper tube box connected to the upper end face of the tube sheet, a plurality of liquid inlet slots evenly opened at the bottom of the distribution plate, a feed pipe connected to the side wall of the upper tube box, the feed pipe communicating with the inside of the upper tube box, a plurality of heat exchange tubes vertically connected to the lower end of the tube sheet, a film distributor connected to the upper end of the heat exchange tubes, the upper and lower ends of the film distributor being a liquid inlet and a connecting part, respectively, the liquid inlet extending into the cavity of the distribution plate, the connecting part being inserted into the upper end of the heat exchange tubes, and the liquid inlet having a first layer of tangential windows and a second layer of tangential windows sequentially from bottom to top.

[0005] Furthermore, the distribution disk has a cylindrical structure, and the top of the distribution disk is uniformly provided with several continuous triangular notches.

[0006] Furthermore, both the first-layer tangential window and the second-layer tangential window contain a number of windows, with the number of windows in each layer being ≥3.

[0007] Furthermore, the film applicator is perpendicular to the tube sheet, and a plurality of windows of the first layer of tangential windows are evenly distributed on the same horizontal plane, and a plurality of windows of the second layer of tangential windows are evenly distributed on the same horizontal plane, with the plurality of windows of the first layer of tangential windows and the plurality of windows of the second layer of tangential windows being staggered.

[0008] Furthermore, the opening shape of the window is an oblique rectangular slot.

[0009] Furthermore, the opening angle of the rectangular slot is 45° to 90°.

[0010] Furthermore, a tear duct is provided at the bottom of the liquid inlet section.

[0011] The beneficial effects of this utility model are: the present application has a compact structure, is easy to operate, has high heat transfer efficiency, a large operating load range, is not prone to short circuit, and can achieve good membrane distribution in the range of 50% to 140% of circulation flow. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the structure of a falling film reboiler according to an embodiment of the present invention; Figure 2 This is a front view of the distribution disk described in this embodiment of the utility model; Figure 3 This is an axial cross-sectional view of the film applicator described in an embodiment of this utility model; Figure 4 yes Figure 3 Cross-sectional view of AA; Figure 5 yes Figure 3 Cross-sectional view of BB.

[0015] In the picture: 1. Upper tube box; 2. Distribution plate; 21. Liquid inlet groove; 22. Triangular notch; 3. Feed pipe; 4. Film distributor; 41. Liquid inlet section; 42. Connection section; 5. Heat exchange tube; 6. Tube sheet; 7. First layer tangential window; 8. Second layer tangential window. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0017] like Figure 1-5 As shown, this utility model discloses a falling film reboiler, including an upper tube box 1. The bottom of the upper tube box 1 is connected to a tube sheet 6. A distribution plate 2 is provided inside the upper tube box 1. The distribution plate 2 is connected to the upper end face of the tube sheet 6. A plurality of liquid inlet slots 21 are evenly opened at the bottom of the distribution plate 2. A feed pipe 3 is provided on the side wall of the upper tube box 1. The feed pipe 3 communicates with the inside of the upper tube box 1. A plurality of heat exchange tubes 5 are vertically connected to the lower end of the tube sheet 6. A film distributor 4 is connected to the upper end of the heat exchange tubes 5. The upper and lower ends of the film distributor 4 are respectively a liquid inlet part 41 and a connecting part 42. The liquid inlet part 41 extends into the cavity of the distribution plate 2. The connecting part 42 is inserted into the upper end of the heat exchange tubes 5. The liquid inlet part 41 is provided with a first layer of tangential windows 7 and a second layer of tangential windows 8 from bottom to top.

[0018] In a specific embodiment of this application, the liquid material enters the upper tube box 1 through the feed pipe 3, and then enters the cavity of the distribution plate 2 through the liquid inlet hole 21 at the bottom of the distribution plate 2. When the liquid material accumulates to a certain height (at the window), it enters the tube of the film distributor 4 through the window on the film distributor 4. The liquid material entering through the window impacts the inner wall of the film distributor 4 in a tangential direction, forming a swirling flow on the inner wall of the film distributor 4. Under the combined action of centrifugal force and gravity, it is evenly attached to the inner wall of the film distributor and flows smoothly into the heat exchange tube 5, avoiding the liquid material on the tube sheet 6 from flowing directly into the center of the tube of the film distributor, causing a liquid short circuit.

[0019] In one specific embodiment of this application, the inlet section 41 of the film distributor 4 is provided with two layers of windows, namely a first tangential window 7 and a second tangential window 8. The upper and lower windows are staggered, and the distance between the two layers of windows is determined by the operating load range, which can achieve good film distribution in the range of 50% to 140% of the circulating flow rate. When the operating flow rate is small, film distribution is performed by the first tangential window 7, and when the operating flow rate is large, film distribution can be increased through the second tangential window 8.

[0020] In a specific embodiment of this application, such as Figure 2 As shown, the top of the distribution plate 2 is uniformly provided with several continuous triangular notches 22. When the liquid rises above the upper edge of the distribution plate, it is uniformly guided to stabilize the liquid level on the tube sheet 6.

[0021] In a specific embodiment of this application, such as Figure 3 As shown, a tear hole 411 is provided at the bottom of the liquid inlet section 41 to ensure that no liquid accumulates on the tube sheet 6 after operation is stopped.

[0022] In a specific embodiment of this application, such as Figure 4-5 As shown, both the first-layer tangential window 7 and the second-layer tangential window 8 contain four windows. The opening angle of the window in the first-layer tangential window 7 is 45°, and the opening angle of the window in the second-layer tangential window 8 is 90°.

[0023] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A falling film reboiler characterized by, The system includes an upper tube box (1), with a tube sheet (6) connected to its bottom. A distribution plate (2) is located inside the upper tube box (1) and connected to the upper surface of the tube sheet (6). The bottom of the distribution plate (2) is evenly provided with several inlet slots (21). A feed pipe (3) is located on the side wall of the upper tube box (1) and communicates with the interior of the upper tube box (1). The lower end of the tube sheet (6) is vertically... A number of heat exchange tubes (5) are directly connected. The upper end of the heat exchange tube (5) is connected to a film distributor (4). The upper and lower ends of the film distributor (4) are a liquid inlet (41) and a connecting part (42), respectively. The liquid inlet (41) extends into the cavity of the distribution plate (2). The connecting part (42) is inserted into the upper end of the heat exchange tube (5). The liquid inlet (41) is provided with a first layer of tangential windows (7) and a second layer of tangential windows (8) from bottom to top.

2. A falling film reboiler according to claim 1, characterized in that The distribution disk (2) is a cylindrical structure, and the top of the distribution disk (2) is uniformly provided with several continuous triangular notches (22).

3. A falling film reboiler as claimed in claim 1, wherein, The first layer tangential window (7) and the second layer tangential window (8) each contain a number of windows, and the number of windows in each layer is ≥3.

4. A falling film reboiler according to claim 3, characterized in that, The film applicator (4) is perpendicular to the tube sheet (6). Several windows of the first layer tangential window (7) are evenly distributed on the same horizontal plane. Several windows of the second layer tangential window (8) are evenly distributed on the same horizontal plane. Several windows of the first layer tangential window (7) and several windows of the second layer tangential window (8) are staggered.

5. A falling film reboiler as claimed in claim 3, wherein, The opening shape of the window is an oblique rectangular slot.

6. A falling film reboiler according to claim 5, wherein, The opening angle of the rectangular slot is 45° to 90°.

7. A falling film reboiler as claimed in claim 1, wherein, The bottom of the liquid inlet (41) is provided with a tear hole (411).

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