A falling film evaporator with enhanced heat exchange and heating uniformity

Abstract

The present invention discloses a falling film evaporator with enhanced heat exchange and uniform heating, belonging to the technical field of falling film evaporators, comprising a feed chamber, an evaporation tube and a liquid collecting chamber which are sequentially arranged and connected from top to bottom, a feed port is arranged on the top surface of the feed chamber, the evaporation tube comprises an evaporation tube shell and an evaporation tube inner core, the evaporation tube shell is fixedly connected to and connected with the feed chamber, a first air inlet and a second air inlet are symmetrically arranged on both sides of the top of the evaporation tube shell, an air outlet is arranged on one side of the bottom of the evaporation tube shell, and the evaporation tube inner core comprises a liquid distributor arranged in the evaporation tube shell. By symmetrically arranging the first air inlet and the second air inlet on both sides of the top of the evaporation tube shell, during the operation of the equipment, high-temperature steam collides after entering, and highly turbulent areas and vortex areas are generated inside the equipment. With the continuous entry of high-temperature steam, the areas generated by the two collisions greatly increase the heat exchange and the uniformity of the distribution of high-temperature steam between dense pipes.

Description

Technical Field

[0001] The invention belongs to the technical field of falling film evaporators, and in particular relates to a falling film evaporator with enhanced heat exchange and heating uniformity. Background Art

[0002] Falling film evaporation is a process in which the feed liquid is added from the feed inlet, passes through the liquid distributor and then enters each heating tube with a small diameter in the form of a film. When the feed liquid flows in the heating tube, the high-temperature steam flowing on the outside of the tube exchanges heat with the tube, heating the feed liquid in the tube to vaporize it, and the generated gas and the remaining feed liquid enter the liquid collecting chamber together. The partially concentrated feed liquid is stored here, and the remaining gas-liquid mixture enters the separation chamber through the steam pipe for separation. After separation, the liquid phase is discharged through the discharge port and the steam enters the condenser or is repeatedly used as a heating medium.

[0003] During the operation of the falling film evaporator, the falling film heating tube is a crucial component that affects the entire workflow and efficiency. The traditional falling film evaporator improves its vaporization efficiency by reducing the diameter of the heating tube so that the feed liquid falls in the form of a film. However, there is still room for improvement in the heat exchange efficiency between the heating tube and the feed liquid. In addition, as the running time of the falling film evaporator increases, scaling or coking will occur inside the heating tube. The traditional cleaning method of the falling film radiator is to shut down the equipment and manually clean each pipe. The efficiency of the cleaning process needs to be further improved.

[0004] Therefore, there is an urgent need for a falling film evaporator that enhances heat exchange and heating uniformity to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a falling film evaporator with enhanced heat exchange and heating uniformity, so as to solve the problems existing in the above-mentioned prior art.

[0006] To achieve the above-mentioned objectives, the present invention provides the following scheme: The present invention provides a falling film evaporator with enhanced heat exchange and heating uniformity, comprising a feed chamber, an evaporation tube and a liquid collecting chamber which are arranged and connected in sequence from top to bottom, the top surface of the feed chamber is provided with a feed port, the evaporation tube comprises an evaporation tube shell and an evaporation tube inner core, the evaporation tube shell is fixedly connected to and connected with the feed chamber, a first air inlet and a second air inlet are symmetrically provided on both sides of the top of the evaporation tube shell, an air outlet is provided on one side of the bottom of the evaporation tube shell, the evaporation tube inner core comprises a liquid distributor arranged in the evaporation tube shell, the bottom surface of the liquid collecting chamber is provided with a feed port, and the sides of the liquid collecting chamber are respectively provided with a vacuum pump pipe port and a plurality of steam pipe ports.

[0007] Preferably, the liquid distributor comprises a plurality of heating tubes, the top surfaces of the heating tubes are provided with connecting plates, and the connecting plates are fixedly connected to the feeding chamber.

[0008] Preferably, the surface of the heating tube is provided with a tiny rectangular array protrusion structure.

[0009] Preferably, the first air inlet and the second air inlet are arranged at corresponding positions.

[0010] Preferably, the air outlet is arranged in a direction perpendicular to the first air inlet and the second air inlet.

[0011] Preferably, the vacuum pump pipe opening is located above the steam pipe opening.

[0012] Preferably, a downward sloping platform is provided on the inner bottom surface of the liquid collecting chamber, and the downward sloping platform is connected to the feed outlet.

[0013] Preferably, two steam pipe openings are arranged on the side wall of the liquid collecting chamber along the vertical direction.

[0014] The present invention discloses the following technical effects: by symmetrically arranging a first air inlet and a second air inlet on both sides of the top of the evaporator tube shell, during the operation of the equipment, high-temperature steam collides after entering, generating highly turbulent areas and vortex areas inside the equipment; as the high-temperature steam continues to enter, the areas generated by these two collisions greatly increase the heat exchange and the uniformity of the distribution of high-temperature steam between dense pipes.

[0015] By utilizing a vacuum pump, when the equipment needs to be cleaned, the valves of the feed port, the first air inlet, the second air inlet, the air outlet, the steam pipe port, the feed port, and each pipeline of the liquid distributor can be closed, and the pressure at the lower part of the equipment can be reduced by the vacuum pump, thereby creating a larger pressure difference between the upper and lower parts. Under the high pressure difference, the cleaning water impacts each heating tube at a high speed to achieve a fast and non-destructive cleaning method for the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0017] Figure 1 It is a schematic diagram of the external structure of the falling film evaporator for enhancing heat exchange and heating uniformity of the present invention;

[0018] Figure 2 It is a structural schematic diagram of the feeding chamber of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the inner core of the evaporation tube of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the evaporation tube shell of the present invention;

[0021] Figure 5It is a structural schematic diagram of the liquid collecting chamber of the present invention;

[0022] Figure 6 The figure is a schematic diagram of the internal structure of the falling film evaporator for enhancing heat exchange and heating uniformity of the present invention.

[0023] In the figure: 1. feed port; 2. first air inlet; 3. second air inlet; 4. air outlet; 5. vacuum pump pipe port; 6. steam pipe port; 7. feed port; 8. feed chamber; 9. evaporator tube; 9a. evaporator tube inner core; 9b. evaporator tube outer shell; 10. liquid collecting chamber; 11. connecting plate; 12. liquid distributor; 13. heating tube; 14. rectangular array raised structure; 15. downward inclined platform. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Reference Figure 1-Figure 6 As shown, this embodiment provides a falling film evaporator for enhancing heat exchange and heating uniformity, including a feed chamber 8, an evaporation tube 9 and a liquid collecting chamber 10 which are arranged and connected in sequence from top to bottom, a feed port is provided on the top surface of the feed chamber 8, the evaporation tube 9 includes an evaporation tube shell 9b and an evaporation tube inner core 9a, the evaporation tube shell 9b is fixedly connected to and connected with the feed chamber 8, a first air inlet 2 and a second air inlet 3 are symmetrically provided on both sides of the top of the evaporation tube shell 9b, an air outlet 4 is provided on one side of the bottom of the evaporation tube shell 9b, the evaporation tube inner core 9a includes a liquid distributor 12 arranged in the evaporation tube shell 9b, a feed discharge port 7 is provided on the bottom surface of the liquid collecting chamber 10, and a vacuum pump pipe port 5 and a plurality of steam pipe ports 6 are respectively provided on the sides of the liquid collecting chamber 10.

[0027] By symmetrically arranging the first air inlet 2 and the second air inlet 3 on both sides of the top of the evaporator tube shell 9b, during the operation of the equipment, the high-temperature steam collides with the equipment after entering, and a highly turbulent area and a vortex area are generated inside the equipment. As the high-temperature steam continues to enter, the areas generated by these two collisions greatly increase the heat exchange and the uniformity of the distribution of the high-temperature steam between the dense pipes.

[0028] By utilizing a vacuum pump, when the equipment needs to be cleaned, the valves of the feed port 1, the first air inlet 2, the second air inlet 3, the air outlet 4, the steam pipe port 6, the feed port 7 and the liquid distributor 12 can be closed, and the pressure at the lower part of the equipment can be reduced by the vacuum pump, thereby generating a larger pressure difference between the upper and lower parts. Under the high pressure difference, the cleaning water impacts each heating tube 13 at a high speed to achieve a quick cleaning method without damaging the pipeline.

[0029] According to a further optimized solution, the liquid distributor 12 includes a plurality of heating tubes 13 , and a connecting plate 11 is provided on the top surface of the heating tubes 13 , and the connecting plate 11 is fixedly connected to the feeding chamber 8 .

[0030] Further optimizing the scheme, the surface of the heating tube 13 is provided with a small rectangular array convex structure 14. A large number of small rectangular array convex structures 14 designed on the outer surface of the heating tube 13 make the outer wall of the heating tube 13 more fully contact with the high-temperature steam, thereby enhancing the heat exchange of the pipeline.

[0031] According to a further optimization scheme, the first air inlet 2 and the second air inlet 3 are arranged at corresponding positions.

[0032] According to a further optimized solution, the air outlet 4 is arranged in a direction perpendicular to the first air inlet 2 and the second air inlet 3 .

[0033] High-temperature steam enters the evaporator tube shell 9b through the first air inlet 2 and the second air inlet 3 to exchange heat with the heating tube 13 to heat the internal liquid. Since the first air inlet 2 and the second air inlet 3 are in an opposing position, the remaining part of the injected high-temperature steam collides with the center of the evaporator tube shell 9b after passing through the heating tube 13 to form an impact flow. An impact zone appears in the central part. After the impact, part of the steam swirls from all directions to form a vortex zone. With the continuous entry of high-temperature steam, the distribution and diffusion of the impact zone and the vortex zone are achieved to improve the heat exchange efficiency of the equipment and the heating uniformity of the heating tube 13 through the impact steam flow.

[0034] According to a further optimized solution, the vacuum pump pipe opening 5 is located above the steam pipe opening 6 .

[0035] According to a further optimized solution, a downward sloping platform 15 is provided on the inner bottom surface of the liquid collecting chamber 10 , and the downward sloping platform 15 is connected to the feed outlet 7 .

[0036] According to a further optimized solution, two steam pipe openings 6 are arranged on the side wall of the liquid collecting chamber 10 along the vertical direction.

[0037] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and 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 therefore should not be understood as a limitation on the present invention.

[0038] The embodiments described above are only descriptions of the preferred modes of the present invention, and are not intended to limit the scope of the present invention. Without departing from the design spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should all fall within the protection scope determined by the claims of the present invention.

Claims

1. A falling film evaporator for enhancing heat exchange and heating uniformity, characterized in that: The invention comprises a feed chamber (8), an evaporation tube (9) and a liquid collecting chamber (10) which are arranged in sequence and connected from top to bottom. The top surface of the feed chamber (8) is provided with a feed port. The evaporation tube (9) comprises an evaporation tube shell (9b) and an evaporation tube inner core (9a). The evaporation tube shell (9b) is fixedly connected to and connected with the feed chamber (8). A first air inlet (2) and a second air inlet (3) are symmetrically arranged on both sides of the top of the evaporation tube shell (9b). An air outlet (4) is arranged on one side of the bottom of the evaporation tube shell (9b). The evaporation tube inner core (9a) comprises a liquid distributor (12) arranged in the evaporation tube shell (9b). The bottom surface of the liquid collecting chamber (10) is provided with a feed port (7). The sides of the liquid collecting chamber (10) are respectively provided with a vacuum pump pipe port (5) and a plurality of steam pipe ports (6). The first air inlet (2) and the second air inlet (3) are arranged relative to each other.

2. The falling film evaporator for enhancing heat exchange and heating uniformity according to claim 1, characterized in that: The liquid distributor (12) comprises a plurality of heating tubes (13), the top surfaces of the heating tubes (13) being provided with connecting plates (11), the connecting plates (11) being fixedly connected to the feed chamber (8).

3. The falling film evaporator for enhancing heat exchange and heating uniformity according to claim 2, characterized in that: The surface of the heating tube (13) is provided with a small-sized rectangular array protrusion structure (14).

4. The falling film evaporator for enhancing heat exchange and heating uniformity according to claim 1, characterized in that: The air outlet (4) is arranged in a direction perpendicular to the first air inlet (2) and the second air inlet (3).

5. The falling film evaporator for enhancing heat exchange and heating uniformity according to claim 1, characterized in that: The vacuum pump pipe opening (5) is located above the steam pipe opening (6).

6. The falling film evaporator for enhancing heat exchange and heating uniformity according to claim 1, characterized in that: The inner bottom surface of the liquid collecting chamber (10) is provided with a downwardly inclined platform (15), and the downwardly inclined platform (15) is connected to the feed outlet (7).

7. The falling film evaporator for enhancing heat exchange and heating uniformity according to claim 1, characterized in that: Two steam pipe openings (6) are arranged on the side wall of the liquid collecting chamber (10) along the vertical direction.

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