Out-tube falling film type photocatalytic reactor and photocatalytic reaction system

Abstract

The utility model belongs to the technical field of chemical equipment, and particularly relates to an out-tube falling film type photocatalytic reactor and a photocatalytic reaction system. The out-tube falling film type photocatalytic reactor comprises a shell, the upper portion of the shell is provided with a liquid-phase material inlet and a heat exchange medium outlet, the lower portion of the shell is provided with a heat exchange medium inlet and a discharge port, a plurality of falling film tubes and a plurality of light source tubes are arranged between the liquid-phase material inlet and the discharge port, and all the falling film tubes and the light source tubes are arranged in parallel in the vertical direction. And a plurality of falling film tubes in a regular polygon array are arranged around each light source tube. The periphery of each light source tube is provided with a plurality of falling film tubes in a regular polygon array, so that the uniformity of light source irradiation in the photocatalytic reaction process can be improved, the reaction time is shortened, the production steps are simplified, the reaction efficiency is improved, and the product quality and yield are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of chemical equipment, in particular to a pipe outside falling film type photocatalytic reactor and photocatalytic reaction system. BACKGROUND

[0002] As an environmentally friendly green technology, photocatalysis can be applied in the field of energy to convert low-density solar energy into clean energy hydrogen energy with high density, and can also be applied in the field of environment to degrade and mineralize organic and inorganic pollutants in the environment by using light energy. At present, photocatalysis has been expanded from the initial photocatalytic decomposition of hydrogen to photocatalytic treatment of wastewater, nitrogen fixation and carbon sequestration, dye-sensitized solar cells, photocatalytic environmental purification materials, photocatalytic reactions and many other fields.

[0003] Photocatalytic reaction refers to a chemical reaction process under external environmental irradiation. The photocatalytic reactor is a key equipment used in the photocatalytic production process, and its performance plays a crucial role in the effect of photocatalytic reaction. When titanium dioxide is irradiated by ultraviolet light, the valence electrons of titanium dioxide will be excited to jump, thereby generating hole-electron pairs. The electrons and holes react with adsorbed water and oxygen to generate active hydrogen oxygen radicals and other strong oxidizing active substances. These active substances can completely oxidize organic matter in water and gas to generate carbon dioxide and water.

[0004] The photocatalytic reactor is a device that uses light energy to catalyze chemical reactions. However, in the prior art, the photocatalytic reactor generally adopts a kettle type structure. The internal structure of this photocatalytic reactor is limited, the light source is not reasonably arranged, and the uniformity of light is poor, which leads to low photocatalytic efficiency, reduces the reaction rate and reaction efficiency. The operation mode of this photocatalytic reactor is usually intermittent, which cannot realize continuous production, further reduces production efficiency, increases production cost, and makes it difficult to accurately control temperature, pressure and other parameters in the reaction process, increases instability and uncertainty, and has adverse effects on product quality and yield. Practical new type content

[0005] In view of the above-mentioned shortcomings of the prior art, the present application provides a pipe outside falling film type photocatalytic reactor and photocatalytic reaction system to solve the above-mentioned problems of poor light uniformity, low photocatalytic efficiency, increased production cost, difficulty in accurately controlling temperature, pressure and other parameters in the reaction process, increased instability and uncertainty, and adverse effects on product quality and yield.

[0006] To achieve the above-mentioned purpose, the scheme of the present application is as follows:

[0007] The utility model provides a kind of outside tube falling film type photocatalytic reactor, the outside tube falling film type photocatalytic reactor includes shell, the upper portion of the shell is equipped with liquid phase material inlet and heat exchange medium outlet, the lower portion of the shell is equipped with heat exchange medium inlet and discharge port, between the liquid phase material inlet and the discharge port are equipped with several falling film tubes and several light source tubes, all the falling film tubes and the light source tubes are vertically parallel, between the liquid phase material inlet and the falling film tube are equipped with several stages of liquid phase distributor, the periphery of each light source tube is equipped with several falling film tubes in regular polygon array.

[0008] The principle of the outside tube falling film type photocatalytic reactor of the utility model is that by setting several falling film tubes in regular polygon array around each light source tube, the uniformity of light source irradiation in photocatalytic reaction process can be increased, and then the reaction time is shortened, the production steps are simplified, the reaction efficiency is improved, and the product quality and yield are improved.

[0009] Optionally, the light source tubes are arranged in regular polygon array.

[0010] Specifically, by arranging the light source tubes in regular polygon array, the uniformity of light source irradiation in photocatalytic reaction process can be further increased, and then the reaction time is shortened, the production steps are simplified, the reaction efficiency is improved, and the product quality and yield are improved.

[0011] Optionally, the inner wall of the shell is provided with a light-reflecting coating.

[0012] Specifically, by adding a light-reflecting coating to the inner wall of the shell, the light reflected by the light-reflecting coating can further shorten the reaction time, simplify the production steps, improve the reaction efficiency, and improve the product quality and yield.

[0013] Optionally, the upper part of the falling film tube is sleeved with a liquid phase distributor, the liquid phase distributor is funnel-shaped, and the bottom of the liquid phase distributor is provided with a plurality of distribution holes.

[0014] Specifically, by sleeving the liquid phase distributor to the upper part of the falling film tube, the liquid phase distributor is funnel-shaped, and the bottom of the liquid phase distributor is provided with a plurality of distribution holes, the distribution holes can enhance the uniformity of liquid phase material distribution, and then the reaction time is further shortened, the production steps are simplified, the reaction efficiency is improved, and the product quality and yield are improved.

[0015] Optionally, the diameter of the distribution hole is 3-5 mm.

[0016] Specifically, the present application can keep the flow rate of liquid phase material within a proper range while enhancing the distribution uniformity of liquid phase material by setting the aperture of the distribution holes to 3-5mm, thereby further shortening the reaction time, simplifying the production steps, improving the reaction efficiency, and improving the product quality and yield.

[0017] Optionally, all the distribution holes are uniformly distributed on the bottom of the liquid phase distributor.

[0018] Specifically, the present application can improve the distribution uniformity of liquid phase material by setting all the distribution holes to be uniformly distributed on the bottom of the liquid phase distributor, thereby further shortening the reaction time, simplifying the production steps, improving the reaction efficiency, and improving the product quality and yield.

[0019] Optionally, all the distribution holes are distributed on the side close to the falling film tube.

[0020] Specifically, the present application can make liquid phase material be distributed to the outer wall of the falling film tube through the distribution holes, avoid the waste of liquid phase material, shorten the distribution time, improve the reaction efficiency, and improve the product quality and yield by setting all the distribution holes to be distributed on the side close to the falling film tube.

[0021] Optionally, the shell further comprises a support for supporting the light source tube and the falling film tube, and the support is in a grid structure formed by intersecting a plurality of grid bars.

[0022] Optionally, the falling film tube is transparent or translucent.

[0023] Specifically, the present application can make the light source penetrate the falling film tube and reflect light, thereby further improving the photocatalytic reaction efficiency by setting the falling film tube to be transparent or translucent.

[0024] In a second aspect, the present application provides a photocatalytic reaction system, which comprises the falling film type photocatalytic reactor outside the tube as described above. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0026] Figure 1 Structure diagram of the falling film type photocatalytic reactor outside the tube of embodiment 1;

[0027] Figure 2 As Figure 1 A cross-sectional view of the middle shell body is shown in Fig. 1.

[0028] Figure 3 As Figure 1 A distribution diagram of the light source tubes and falling film tubes is shown in Fig. 2.

[0029] Figure 4 As Figure 1 A top view of the liquid distributor and falling film tubes in the falling film light catalytic reactor outside the tubes is shown in Fig. 3.

[0030] Figure 5 As Figure 1 A structural diagram of the support is shown in Fig. 4.

[0031] Reference signs

[0032] 1 - shell body, 11 - light-reflecting coating, 12 - liquid phase material inlet, 13 - heat exchange medium outlet, 14 - heat exchange medium inlet, 15 - power line cavity, 16 - discharge port, 17 - support, 171 - grating bar, 18 - power line tube opening, 19 - fixing plate

[0033] 2 - falling film tube

[0034] 3 - light source tube

[0035] 4 - liquid phase distributor, 41 - distribution hole DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0038] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description and cannot be understood as indicating or implying the relative importance of the technical features or implying the number of the technical features indicated. Therefore, the features limited by "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text is to include three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of the ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0039] The present application provides a kind of outside tube falling film type photocatalytic reactor, comprising:

[0040] Shell 1, the inner wall of shell 1 is provided with reflective coating 11, the upper portion of shell 1 is provided with gas inlet 12, liquid phase material inlet 13 and heat exchange medium outlet 14, the lower portion of shell is provided with heat exchange medium inlet 15 and discharge port 17, liquid phase material inlet 13 and discharge port 17 are provided with a plurality of falling film tubes 2 and a plurality of light source tubes 3, all falling film tubes 2 and light source tubes 3 are vertically parallel, each light source tube 3 is provided with a plurality of falling film tubes 2 in regular polygon array around, light source tube 3 is arranged in regular polygon array, falling film tube 2 adopts transparent or translucent falling film tube;

[0041] Shell 1 is also provided with support 17 for supporting light source tube 3, support 17 is in the form of grid structure formed by a plurality of grid bars 171.

[0042] In the present application, the upper portion of falling film tube 2 is provided with liquid phase distributor 4, liquid phase distributor 4 is in the form of funnel, the bottom of liquid phase distributor 4 is provided with a plurality of distribution holes 41, the aperture of distribution hole 41 is 3-5mm, all distribution holes 41 are uniformly distributed in the bottom of liquid phase distributor 4, and all distribution holes 41 are distributed along the side close to falling film tube 2.

[0043] Another embodiment of the present application also provides a kind of photocatalytic reaction system, which comprises the outside tube falling film type photocatalytic reactor as described above.

[0044] In the following description, a large number of details are discussed to provide a more thorough explanation of the embodiments of the present application, however, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details.

[0045] Example 1

[0046] Please refer toFigure 1 , Figure 1 It is a structural schematic diagram of the outside-tube falling-film type photocatalytic reactor of the embodiment, which comprises a shell 1.

[0047] Please refer to Figure 1 and Figure 2 The inner wall of the shell 1 is provided with a light-reflecting coating 11, and the shell 1 is provided with a support 17. The upper part of the shell 1 is provided with a power line opening 18, a liquid-phase material inlet 12, a heat exchange medium outlet 14, and a fixing plate 19 for fixing the light source tube 3. The lower part of the shell 1 is provided with a heat exchange medium inlet 14 and a discharge outlet 16. The upper part of the shell 1 is provided with a power line cavity 15 for accommodating the connecting line (i.e. the electric wire) of the light source tube 3 to avoid the safety hazard caused by the contact between the connecting line and the liquid-phase material. A plurality of falling-film tubes 2 and a plurality of light source tubes 3 are arranged between the liquid-phase material inlet 11 and the discharge outlet 16. All the falling-film tubes 2 and the light source tubes 3 are arranged in parallel along the vertical direction. A plurality of stages of liquid-phase distributors 4 are arranged between the liquid-phase material inlet 11 and the falling-film tubes 2. The reflecting material of the light-reflecting coating 11 can be polypropylene resin or the like. The falling-film tubes 2 are fixed to the inner wall of the shell 1 by a tube plate. The falling-film tubes 2 are made of transparent or translucent falling-film tubes.

[0048] Specifically, the embodiment can reflect the light irradiated by the light source through the light-reflecting coating 11, thereby shortening the reaction time, simplifying the production steps, improving the reaction efficiency, and improving the product quality and yield. The embodiment is advantageous for the light source to penetrate the falling-film tubes 2, reflect the light, and further improve the photocatalytic reaction efficiency by arranging the falling-film tubes 2 to be made of transparent or translucent falling-film tubes.

[0049] Please refer to Figure 3 A plurality of falling-film tubes 2 arranged in a regular polygonal array are arranged around each light source tube 3. The light source tubes 3 are arranged in a regular polygonal array. The light source of the light source tube 3 can be ultraviolet light or the like.

[0050] Specifically, the embodiment can increase the uniformity of the light source irradiation in the photocatalytic reaction process by arranging the light source tubes 3 to be arranged in a regular polygonal array, thereby shortening the reaction time, simplifying the production steps, improving the reaction efficiency, and improving the product quality and yield.

[0051] Please refer to Figure 4 The upper part of the falling-film tube 2 is sleeved with a liquid-phase distributor 4. The liquid-phase distributor 4 is in the shape of a funnel. A plurality of distribution holes 41 are formed in the bottom of the liquid-phase distributor 4. The diameter of the distribution holes 41 is 3-5 mm. All the distribution holes 41 are distributed on the side close to the falling-film tube. All the distribution holes 41 are uniformly distributed on the bottom of the liquid-phase distributor.

[0052] Specifically, the embodiment sets the liquid phase distributor 4 on the upper part of the falling film tube 3, the liquid phase distributor 4 is funnel-shaped, and the bottom of the liquid phase distributor 4 is provided with a plurality of distribution holes 41, which can enhance the uniformity of the distribution of the liquid phase material, and further shorten the reaction time, simplify the production steps, improve the reaction efficiency, improve the product quality and yield. By setting the diameter of the distribution hole 41 to 3-5mm, the uniformity of the distribution of the liquid phase material can be enhanced while keeping the flow rate of the liquid phase material within an appropriate range, thereby further shortening the reaction time, simplifying the production steps, improving the reaction efficiency, improving the product quality and yield.

[0053] By setting all the distribution holes 41 to be uniformly distributed on the bottom of the liquid phase distributor 4, the uniformity of the distribution of the liquid phase material can be improved, thereby further shortening the reaction time, simplifying the production steps, improving the reaction efficiency, improving the product quality and yield. All the distribution holes are distributed along the side close to the falling film tube. By setting all the distribution holes 41 to be uniformly distributed along the side close to the falling film tube 3, it is beneficial to distribute the liquid phase material along the distribution holes 41 to the outer wall of the falling film tube 3, avoid waste of the liquid phase material, shorten the distribution time, improve the reaction efficiency, improve the product quality and yield.

[0054] Please refer to Figure 5 The support 17 is used for supporting the light source tube 3, the support 17 is formed by intersecting a plurality of grid bars 171, the support 17 is in a grid structure, and the top end of the grid bar 171 abuts against the bottom end of the light source tube 3.

[0055] The principle of the falling film type photocatalytic reactor outside the tube is that by setting a plurality of falling film tubes 2 in a regular polygon array around each light source tube 3, the uniformity of the light source irradiation in the photocatalytic reaction process can be improved, thereby shortening the reaction time, simplifying the production steps, improving the reaction efficiency, improving the product quality and yield.

[0056] The above embodiments only exemplarily illustrate the principle and effect of the present application, and are not used to limit the present application. Any person skilled in the art can modify or change the above embodiments without departing from the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by those skilled in the art without departing from the spirit and technical thought disclosed by the present application should be covered by the claims of the present application.

Claims

1. A photocatalytic reactor of the outside-down falling film type, characterized in that, The outer-tube falling-film photocatalytic reactor comprises a shell, an upper portion of the shell is provided with a liquid-phase material inlet and a heat exchange medium outlet, a lower portion of the shell is provided with a heat exchange medium inlet and a discharge outlet, a plurality of falling-film tubes and a plurality of light source tubes are arranged between the liquid-phase material inlet and the discharge outlet, all the falling-film tubes and the light source tubes are arranged in parallel along the vertical direction, a plurality of falling-film tubes in a regular polygonal array are arranged around each light source tube.

2. The outside-tube falling-film photocatalytic reactor according to claim 1, wherein The light source tubes are arranged in a regular polygonal array.

3. The outside-tube falling-film photocatalytic reactor according to claim 1, wherein An inner wall of the shell is provided with a light-reflecting coating.

4. The outside-tube falling-film photocatalytic reactor according to claim 1, wherein An upper portion of each falling-film tube is sleeved with a liquid-phase distributor, the liquid-phase distributor is funnel-shaped, a bottom of the liquid-phase distributor is provided with a plurality of distribution holes.

5. The outside-tube falling-film photocatalytic reactor according to claim 4, wherein The diameter of each distribution hole is 3-5 mm.

6. The outside-tube falling-film photocatalytic reactor according to claim 4, wherein All the distribution holes are uniformly distributed on the bottom of the liquid-phase distributor.

7. The outside-tube falling-film photocatalytic reactor according to claim 4, wherein All the distribution holes are distributed on a side close to the falling-film tube.

8. The outside-tube falling-film photocatalytic reactor according to claim 1, wherein The shell is further provided with a support for supporting the light source tubes, the support is in a grid-shaped structure formed by a plurality of grid bars intersecting with each other.

9. The outside-tube falling-film photocatalytic reactor according to claim 1, wherein The falling-film tubes are transparent or semi-transparent.

10. A photocatalytic reaction system characterized by comprising: The photocatalytic reaction system comprises the outer-tube falling-film photocatalytic reactor according to any one of claims 1-9.

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