In-tube falling film type photocatalytic reactor

Abstract

The utility model relates to the technical field of chemical equipment, in particular to an in-tube falling film type photocatalytic reactor. The in-tube falling film type photocatalytic reactor comprises a shell, an air inlet, a liquid inlet and a first heat exchange medium inlet and outlet are formed in the upper portion of the shell, a second heat exchange medium inlet and outlet is formed in the lower portion of the shell, a discharging port is formed in the bottom of the shell, a plurality of falling film tubes are fixedly arranged between the liquid inlet and the discharging port, and all the falling film tubes are arranged in parallel in the vertical direction. A plurality of stages of liquid phase distributors are arranged between the liquid inlet and the falling film pipes, and light source pipes are arranged in all the falling film pipes in a sleeving manner. According to the scheme, liquid to be treated can flow through the inner wall of the falling film tube in a film shape through the falling film tube and the liquid phase distributor, and the light source tube is arranged in the falling film tube in a sleeving manner, so that the contact area of a liquid phase material flowing through the inner wall of the falling film tube and a light source can be increased, the light source utilization rate is improved, the reaction efficiency is improved, the energy consumption is reduced, and the yield and quality are improved.

Description

Technical Field

[0001] This application relates to the field of chemical equipment technology, specifically to an in-tube falling film photocatalytic reactor. Background Technology

[0002] A photocatalytic reactor is a device that uses light energy to catalyze chemical reactions. Compared with traditional reactors, the design of a photocatalytic reactor is more complex. In addition to considering the mass transfer and mixing, contact between reactants and catalysts, flow patterns, reaction kinetics, catalyst loading, and temperature control of traditional reactors, a photocatalytic reactor must also consider factors such as the configuration of the light source, the propagation and distribution of light within the reactor, the uniformity and transparency of illumination, and the characteristics of the light source.

[0003] The performance of a photocatalytic reactor is closely related to the uniformity of light illumination and reaction efficiency. For efficient photocatalytic reactions, uniform light distribution and effective utilization of light energy are crucial. However, traditional photocatalytic reactors are mostly of the batch type. Due to limitations in the reactor's internal structure and unreasonable light source arrangement, uneven illumination occurs. The uppermost layer of the reaction liquid receives ample light, while the lower layer receives less light, affecting the catalytic efficiency of the photocatalyst. This results in some areas of the photocatalyst failing to fully utilize light energy, thus reducing the reaction rate and efficiency. Secondly, batch photocatalytic reactors typically operate intermittently, meaning that after each feeding, the reaction proceeds for a period of time, then the product is discharged and the feed is repeated. This operation method cannot achieve continuous production, limiting the improvement of production efficiency. Furthermore, intermittent operation also increases operational complexity and cost. Moreover, the reaction conditions (such as temperature, pressure, and light intensity) of batch photocatalytic reactors are often difficult to control precisely. This can lead to instability and uncertainty in the reaction process, affecting the quality and yield of the product. Utility Model Content

[0004] In view of the shortcomings of the prior art described above, in order to achieve the above objectives, the solution of this application is as follows:

[0005] This utility model provides an in-tube falling film photocatalytic reactor, which includes: a shell, an air inlet, a liquid inlet and a first heat exchange medium inlet and outlet at the upper part of the shell, a second heat exchange medium inlet and outlet at the lower part of the shell, a discharge port at the bottom of the shell, a plurality of falling film tubes fixedly arranged between the liquid inlet and the discharge port, all of the falling film tubes being arranged vertically in parallel, a plurality of liquid phase distributors being arranged between the liquid inlet and the falling film tubes, and a light source tube being sleeved inside all the falling film tubes.

[0006] As described above, the in-tube falling film photocatalytic reactor of this application has the following beneficial effects:

[0007] In this scheme, the liquid to be treated can flow through the inner wall of the falling film tube in a film-like manner through the falling film tube and the liquid phase distributor. By placing the light source tube inside the falling film tube, the contact area between the liquid phase material flowing through the inner wall of the falling film tube and the light source can be increased, thereby improving the utilization rate of the light source, thus improving the reaction efficiency, reducing energy consumption, and increasing the yield and quality.

[0008] Optionally, a film distributor is provided between the last-stage liquid phase distributor and the falling film tube.

[0009] In this scheme, the film distributor installed between the last-stage liquid phase distributor and the falling film tube can increase the uniformity of the distribution of the liquid to be treated as it flows through the inner wall of the falling film tube in a film-like manner, improve the distribution effect of the liquid phase material on the inner wall of the falling film tube, further increase the contact area between the liquid phase material flowing through the inner wall of the falling film tube and the light source, improve the utilization rate of the light source, and thus improve the reaction efficiency, reduce energy consumption, and improve the yield and quality.

[0010] Optionally, the film applicator can be a nozzle or a swirl-type film applicator.

[0011] Optionally, the inner wall of the swirl-type film distributor is provided with a spiral guide groove.

[0012] In this scheme, the spiral guide groove set on the inner wall of the swirling film distributor allows the liquid material to enter the falling film tube in a swirling manner. Therefore, after the material enters the falling film tube, it has an initial circumferential velocity, which can slow down its radial aggregation, thereby making the material form a uniform film on the inner wall of the falling film tube.

[0013] Optionally, the falling film tube may be a transparent falling film tube or a semi-transparent falling film tube.

[0014] In this scheme, a transparent or semi-transparent falling film tube is used, which is beneficial for the penetration and irradiation of the light source, further improving the reaction efficiency in the photocatalytic reaction process, further reducing energy consumption, and improving yield and quality.

[0015] Optionally, the in-tube falling film photocatalytic reactor further includes a grid plate for supporting the light source plate, the grid plate having a plurality of grid strips, the top of the grid strips abutting against the bottom of the light source tube.

[0016] Optionally, the bottom of the final stage liquid phase distributor is provided with several gas phase channel ports and liquid phase distribution ports.

[0017] Optionally, all of the gas phase passages are evenly distributed at the bottom of the last-stage liquid phase distributor.

[0018] In this scheme, by setting all the gas phase channel openings to be evenly distributed at the bottom of the last stage liquid phase distributor, the uniformity of gas phase material distribution can be increased, which is conducive to the full reaction of gas phase material and liquid phase material, improving the reaction efficiency in the photocatalytic reaction process, further reducing energy consumption, and increasing yield and quality.

[0019] Optionally, all the liquid phase distribution ports are evenly distributed at the bottom of the last stage liquid phase distributor.

[0020] In this scheme, by uniformly distributing all the liquid phase distribution ports at the bottom of the last stage liquid phase distributor, the uniformity of liquid phase material distribution can be increased, which is conducive to the full reaction of liquid phase material and gas phase material, improving the reaction efficiency in the photocatalytic reaction process, further reducing energy consumption, and increasing yield and quality.

[0021] Optionally, the aperture of all the gas phase channel ports is larger than the aperture of the liquid phase distribution ports.

[0022] Optionally, a plurality of liquid phase distribution ports are distributed around the gas phase channel port.

[0023] In this scheme, by distributing several liquid phase distribution ports around the gas phase channel, it is beneficial to enable the liquid phase material and the gas phase material to react fully, improve the reaction efficiency in the photocatalytic reaction process, further reduce energy consumption, and improve yield and quality.

[0024] Optionally, all the liquid phase distribution ports are evenly distributed around the gas phase channel ports.

[0025] In this scheme, by uniformly distributing all the liquid phase distribution ports around the gas phase channel port, the contact between the liquid phase material and the gas phase material can be effectively increased, which is conducive to the full reaction of the liquid phase material and the gas phase material, improving the reaction efficiency in the photocatalytic reaction process, further reducing energy consumption, and increasing yield and quality.

[0026] Optionally, the aperture of the liquid phase distribution port is 1-10 mm.

[0027] In this scheme, setting the aperture of the liquid phase distribution port to 1-10 mm is beneficial to ensure uniform distribution of the liquid phase material, which in turn facilitates the full reaction between the liquid phase material and the gas phase material, improves the reaction efficiency in the photocatalytic reaction process, further reduces energy consumption, and increases yield and quality. If the aperture of the liquid phase distribution port is less than 1 mm, the diversion effect of the liquid phase material is not obvious. If the aperture of the liquid phase distribution port is greater than 10 mm, the liquid phase material tends to flow through the inner wall of the falling film tube in a stream rather than a film, which is not conducive to the reaction. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the in-tube falling film photocatalytic reactor of Example 1;

[0030] Figure 2 This is a schematic diagram showing the distribution of the falling film tube and the light source tube in Example 1;

[0031] Figure 3 This is a schematic diagram of the last stage liquid phase distributor in Example 1;

[0032] Figure 4 This is a schematic diagram of the grating plate in Example 1.

[0033] Figure Labels

[0034] 1-Shell, 11-Liquid inlet, 12-First heat exchange medium inlet / outlet, 13-Power cable inlet, 14-Air inlet, 15-Discharge outlet, 16-Grate plate, 161-Grate bar, 17-Tube sheet, 18-Second heat exchange medium inlet / outlet;

[0035] 2-Falling film tube;

[0036] 3-Liquid phase distributor, 31-Gas phase channel inlet, 32-Liquid phase distribution inlet;

[0037] 4-Light source tube;

[0038] 5-Film applicator; Detailed Implementation

[0039] 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. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0041] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the word "and / or" throughout the text means including three parallel solutions; taking "A and / or B" as an example, it includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0042] Traditional photocatalytic reactors are mostly of the batch type. Due to the limitations of the reactor's internal structure and the unreasonable arrangement of the light source, uneven illumination occurs. The uppermost layer of the reaction liquid receives sufficient light, while the lower layer receives less light, affecting the catalytic efficiency of the photocatalyst. This results in some areas of the photocatalyst failing to fully utilize light energy, thus reducing the reaction rate and efficiency. Batch-type photocatalytic reactors typically operate in a batch manner, meaning that after each feeding, the reaction proceeds for a period of time, then the product is discharged and the feed is repeated. This operation method cannot achieve continuous production, limiting the improvement of production efficiency. Batch operation also increases operational complexity and cost. The reaction conditions (such as temperature, pressure, and light intensity) of batch-type photocatalytic reactors are often difficult to control precisely. This may lead to instability and uncertainty in the reaction process, affecting technical problems such as product quality and yield.

[0043] Based on the above-mentioned technical problems, one embodiment of this utility model provides an in-tube falling film photocatalytic reactor, comprising: a shell 1, an air inlet 14, a liquid inlet 11, and a first heat exchange medium inlet / outlet 18 at the upper part of the shell 1, a second heat exchange medium inlet / outlet 12 at the lower part of the shell 1, a discharge outlet 15 at the bottom of the shell 1, a plurality of falling film tubes 2 fixedly arranged between the liquid inlet 11 and the discharge outlet 15, all falling film tubes 2 arranged vertically in parallel, a plurality of stages of liquid phase distributors 3 arranged between the liquid inlet 11 and the falling film tubes 2, a light source tube 4 sleeved inside each falling film tube 2, and a film distributor 5 arranged between the last stage of liquid phase distributor 3 and the falling film tube 2, the film distributor 5 being a nozzle or a cyclone film distributor, the falling film tubes 2 being transparent or semi-transparent falling film tubes, and also including... A grid plate 16 is used to support the light source tube 3. The grid plate 16 is provided with several grid strips 161. The top end of the grid strips 161 abuts against the bottom end of the light source tube 2. The bottom of the last stage liquid phase distributor 3 is provided with several gas phase channel ports 31 and liquid phase distribution ports 32. All gas phase channel ports 31 are evenly distributed at the bottom of the last stage liquid phase distributor 3. All liquid phase distribution ports 32 are evenly distributed at the bottom of the last stage liquid phase distributor 3. The aperture of the gas phase channel port 31 is larger than the aperture of the liquid phase distribution port 32. Several liquid phase distribution ports 32 are distributed around the gas phase channel port 31. The aperture of the liquid phase distribution port 32 is 1-10mm.

[0044] Numerous details are explored in the following description to provide a more thorough explanation of embodiments of the present invention; however, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0045] Example 1

[0046] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of the in-tube falling film photocatalytic reactor in this embodiment.

[0047] Please continue reading. Figure 1 The in-tube falling film photocatalytic reactor includes a shell 1. The upper part of the shell 1 has an air inlet 14, a liquid inlet 11, and a first heat exchange medium inlet / outlet 18. The lower part of the shell 1 has a second heat exchange medium inlet / outlet 12 and a power cord port 13. The bottom of the shell 1 has a discharge port 15. Several falling film tubes 2 are fixedly arranged between the liquid inlet 11 and the discharge port 15. All falling film tubes 2 are arranged vertically in parallel. Several stages of liquid phase distributors 3 are provided between the liquid inlet 11 and the falling film tubes 2. The discharge port 15 includes, but is not limited to, flange connections; other discharge methods, such as a bent-off discharge port, can also be used.

[0048] Specifically, in this embodiment, the film distributor set between the last-stage liquid phase distributor 3 and the falling film tube 2 can increase the uniformity of the distribution of the liquid to be treated as it flows through the inner wall of the falling film tube in a film-like manner, improve the distribution effect of the liquid phase material on the inner wall of the falling film tube 2, further increase the contact area between the liquid phase material flowing through the inner wall of the falling film tube 2 and the light source, improve the utilization rate of the light source, and thus improve the reaction efficiency, reduce energy consumption, and improve the yield and quality.

[0049] Please see Figure 1 and Figure 2 All falling film tubes 2 are internally fitted with light source tubes 4. A film distributor 5 is provided between the last-stage liquid phase distributor 3 and the falling film tube 2. The film distributor 5 is either a nozzle or a vortex-type film distributor. The falling film tube 2 is a transparent or semi-transparent falling film tube. The upper and lower parts of the shell 1 are provided with tube plates 17 for fixing the falling film tube 2. The falling film tube 2 is either a transparent or semi-transparent falling film tube. A film distributor 2 is provided between the last-stage liquid phase distributor 3 and the falling film tube 2. The film distributor 2 is either a nozzle or a vortex-type film distributor. The vortex-type film distributor is fixed to the top of the falling film tube. The inner wall of the vortex-type film distributor is provided with a spiral guide groove. For the specific structure of the vortex-type film distributor, please refer to CN114405050A. The first-stage liquid phase distributor 3 can be a tubular liquid distributor, a jet liquid distributor, a disc liquid distributor, or a tank liquid distributor. Tubular liquid distributors, jet liquid distributors, disc liquid distributors, and tank liquid distributors are existing technologies and will not be described in detail here.

[0050] Specifically, in this embodiment, the spiral guide grooves on the inner wall of the swirling film distributor 2 allow the liquid material to enter the falling film tube 2 in a swirling manner. Therefore, the material has an initial circumferential velocity upon entering the falling film tube 2, which slows down its radial aggregation, resulting in a uniform film formation on the inner wall of the falling film tube 2. In this embodiment, the falling film tube 2 is a transparent or semi-transparent tube, which facilitates the penetration and irradiation of the light source, further improving the reaction efficiency in the photocatalytic reaction process, further reducing energy consumption, and increasing yield and quality.

[0051] Please see Figure 3 The bottom of the last-stage liquid phase distributor 3 is provided with several gas phase channel ports 31 and liquid phase distribution ports 32. All gas phase channel ports 31 are evenly distributed at the bottom of the last-stage liquid phase distributor 3, and all liquid phase distribution ports 32 are evenly distributed at the bottom of the last-stage liquid phase distributor 3. The aperture of the gas phase channel port 31 is larger than the aperture of the liquid phase distribution port 32. Several liquid phase distribution ports 32 are distributed around the gas phase channel port 31. The aperture of the liquid phase distribution port 32 is 1-10mm.

[0052] In this embodiment, by uniformly distributing all gas phase channel openings 31 at the bottom of the last-stage liquid phase distributor 3, the uniformity of gas phase material distribution can be increased, which is conducive to the full reaction of gas phase material and liquid phase material, improving the reaction efficiency in the photocatalytic reaction process, further reducing energy consumption, and increasing yield and quality. In this embodiment, by uniformly distributing all liquid phase distribution openings 32 at the bottom of the last-stage liquid phase distributor 3, the uniformity of liquid phase material distribution can be increased, which is conducive to the full reaction of liquid phase material and gas phase material, improving the reaction efficiency in the photocatalytic reaction process, further reducing energy consumption, and increasing yield and quality. In this embodiment, by distributing several liquid phase distribution openings 32 around the gas phase channel opening 31, it is beneficial to allow the liquid phase material and gas phase material to react fully, improving the reaction efficiency in the photocatalytic reaction process, further reducing energy consumption, and increasing yield and quality. In this embodiment, by uniformly distributing all liquid phase distribution openings 32 around the gas phase channel opening 31, it is possible to effectively increase the contact between liquid phase material and gas phase material, which is beneficial to allow the liquid phase material and gas phase material to react fully, improving the reaction efficiency in the photocatalytic reaction process, further reducing energy consumption, and increasing yield and quality. In this embodiment, setting the aperture of the liquid phase distribution port to 1-10 mm is beneficial for uniform distribution of the liquid phase material, which in turn facilitates the full reaction between the liquid phase material and the gas phase material, improves the reaction efficiency in the photocatalytic reaction process, further reduces energy consumption, and increases yield and quality. If the aperture of the liquid phase distribution port is less than 1 mm, the diversion effect of the liquid phase material is not obvious. If the aperture of the liquid phase distribution port is greater than 10 mm, the liquid phase material tends to flow through the inner wall of the falling film tube in a stream rather than a film, which is not conducive to the reaction.

[0053] Please see Figure 1 and Figure 4 The in-tube falling film photocatalytic reactor also includes a grid plate 16 for supporting the light source tube 3. The grid plate 16 is provided with a number of grid strips 161. The top end of the grid strips 161 abuts against the bottom end of the light source tube 4. The grid strips 161 are provided with cavities for placing the power line of the light source tube 4.

[0054] In this embodiment, by adding a grid plate 16 for supporting the light source tube 3, the grid plate 16 is provided with a plurality of grid strips 161. The top end of the grid strips 161 abuts against the bottom end of the light source tube 4. The grid strips 161 can support the light source tube 4, and the power cord of the light source tube 4 can be placed through the cavity added by the grid strips 161. This improves the aesthetics while avoiding contact between the material and the power cord of the light source tube 4, thus improving safety.

[0055] The principle of the in-tube falling film photocatalytic reactor in this embodiment is as follows:

[0056] In this scheme, the liquid to be treated can flow through the inner wall of the falling film tube 2 in a film-like manner through the falling film tube 2 and the liquid phase distributor 3. By installing the light source tube 4 inside the falling film tube 2, the contact area between the liquid phase material flowing through the inner wall of the falling film tube 2 and the light source can be increased, thereby improving the utilization rate of the light source, thus improving the reaction efficiency, reducing energy consumption, and increasing the yield and quality.

[0057] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A falling film photocatalytic reactor with an in-tube design, characterized in that, The in-tube falling film photocatalytic reactor includes a shell. The upper part of the shell is provided with an air inlet, a liquid inlet, and a first heat exchange medium inlet and outlet. The lower part of the shell is provided with a second heat exchange medium inlet and outlet. The bottom of the shell is provided with a discharge port. A plurality of falling film tubes are fixedly arranged between the liquid inlet and the discharge port. All the falling film tubes are arranged vertically in parallel. A plurality of liquid phase distributors are provided between the liquid inlet and the falling film tubes. A light source tube is sleeved inside all the falling film tubes.

2. The in-tube falling film photocatalytic reactor as described in claim 1, characterized in that, A film distributor is provided between the final stage liquid phase distributor and the falling film tube; And / or, the falling film tube is a transparent falling film tube or a semi-transparent falling film tube.

3. The in-tube falling film photocatalytic reactor as described in claim 2, characterized in that, The film applicator is either a nozzle or a swirl-type film applicator.

4. The in-tube falling film photocatalytic reactor as described in claim 1, characterized in that, It also includes a grid plate for supporting the light source plate, the grid plate having a plurality of grid strips, the top of the grid strips abutting against the bottom of the light source tube.

5. The in-tube falling film photocatalytic reactor as described in claim 1, characterized in that, The bottom of the final stage liquid phase distributor has several gas phase channel ports and liquid phase distribution ports.

6. The in-tube falling film photocatalytic reactor as described in claim 5, characterized in that, All of the gas phase channel openings are evenly distributed at the bottom of the last stage liquid phase distributor; And / or, all of the liquid phase distribution ports are evenly distributed at the bottom of the last stage liquid phase distributor.

7. The in-tube falling film photocatalytic reactor as described in claim 5, characterized in that, The aperture of the gas phase channel is larger than the aperture of the liquid phase distribution port.

8. The in-tube falling film photocatalytic reactor as described in claim 5, characterized in that, Several liquid phase distribution ports are distributed around the gas phase channel opening.

9. The in-tube falling film photocatalytic reactor as described in claim 8, characterized in that, All the liquid phase distribution ports are evenly distributed around the gas phase channel ports.

10. The in-tube falling film photocatalytic reactor as described in claim 5, characterized in that, The aperture of the liquid phase distribution port is 1-10 mm.

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