Photocatalytic carbon dioxide reduction reaction device

Abstract

The application provides a kind of photocatalytic carbon dioxide reduction reaction device, it relates to photocatalytic reaction equipment technical field, including: reactor body, microreactor, the microreactor is made of several vertical layering staggered catalytic wallboard splicing combination, inlet and outlet, gas distribution plate and catalytic reaction frame, the catalytic reaction frame includes optical fiber lamp tube strip and vortex generator, the vortex generator includes venturi and spoiler, the gas that passes through venturi is blocked by spoiler to make it produce karman vortex street phenomenon, the gas hole is opened on catalytic wallboard in the application to improve the contact area of gas and catalytic wallboard, in addition, venturi and spoiler are also provided in the reaction channel, the gas that passes through venturi is blocked by spoiler to make it produce karman vortex street phenomenon, to make gas form vortex in the reaction channel, break the boundary layer of reaction gas, improve the efficiency of photocatalytic reaction.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of photocatalytic reaction equipment, in particular to a photocatalytic carbon dioxide reduction reaction device. BACKGROUND

[0002] The large consumption of fossil energy brings two severe problems to human beings: energy crisis and environmental problems. This has become a common challenge faced by the development of countries all over the world. It is generally believed that the excessive emission of CO2 is the main cause of a series of extreme environmental change problems such as global warming, land desertification and ocean acidification. Therefore, the reduction of CO2 has become a problem that needs to be solved by countries all over the world.

[0003] The photocatalytic reduction of CO2 technology can reduce CO2 to CH3OH, CH3CH2OH and other fuels, which not only can reduce the concentration of CO2 in the atmosphere, but also can realize the conversion and storage of energy. In the reaction process of photocatalytic reduction of CO2, the reactor as the core device directly determines whether the reaction can be carried out efficiently and stably. However, the existing photocatalytic CO2 reduction reactor has many challenges in the aspects of light energy utilization rate, contact area of reactants and catalyst, mass transfer efficiency and catalyst separation and recovery, which seriously affects the further development and industrial application of the photocatalytic reduction of CO2 technology.

[0004] In the prior art, the publication number is "CN1836777A", which is a regular net-shaped porous carbon carrier suitable for catalyst and a preparation method thereof, and a regular photocatalyst obtained by loading a photocatalyst on the carrier and a preparation method thereof. The carbon carrier of the catalyst is a net-shaped porous carbon carrier, which can be directly prepared on a support and firmly bonded, has high mechanical strength and adsorption performance, and fundamentally avoids problems such as falling of the carrier from the support. The secondary loading of the carrier is carried out in a coating manner, so that the thickness of the carbon layer of the carrier can be easily controlled. Through carbonization and activation, the surface area and pore structure of the carbon carrier can be controlled in a wide range, so that the carrier suitable for different catalysts can be manufactured to adapt to different actual situations. The regular photocatalyst loaded on the carbon carrier is a photocatalyst with adsorption and reactivity, which has the characteristics of high light flux and low pressure drop, and can be conveniently used for gas phase or liquid phase pollution treatment.

[0005] However, the device still has obvious defects in use: the above device is provided with dense air holes, which increases the resistance of gas flow, thereby affecting the reaction efficiency. In addition, there are reactors with large hole diameters in the prior art, but the smooth flow of gas flow will form a boundary layer of reaction gas. The boundary layer of reaction gas refers to the thin layer area with significant velocity gradient and concentration gradient formed near the solid surface in the reactor when the reaction gas contacts the surface of the solid catalyst or other solid boundaries, such as reactor wall, due to the viscosity of fluid and the blocking effect of solid surface. The existence of the gas boundary will increase the mass transfer resistance and further limit the reaction rate. SUMMARY

[0006] The purpose of the present application is to provide a photocatalytic carbon dioxide reduction reaction device to solve the problems raised in the background art.

[0007] To achieve the above purpose, the present application provides the following technical scheme:

[0008] A photocatalytic carbon dioxide reduction reaction device, comprising:

[0009] A reactor body composed of a base, an outer shell and a top cover, the base, the outer shell and the top cover enclosing a reactor cavity;

[0010] A microreactor composed of a plurality of vertically stacked and staggered catalytic wall plates spliced and combined, forming a plurality of rectangular array arranged reaction channels from bottom to top, the catalytic wall plates being coated with a photocatalyst;

[0011] An inlet and outlet port, the inlet and outlet port comprising a reaction gas inlet and a reaction product outlet, the reaction gas inlet being arranged below the outer shell, the reaction product outlet being arranged above the outer shell, the reaction gas inlet and the reaction product outlet both being in communication with the inside of the reactor cavity;

[0012] A gas distribution plate fixedly installed on the assembly groove opened in the outer shell, the gas distribution plate being provided with gas diffusion holes in a rectangular array corresponding to the reaction channels, the microreactor being fixedly installed above the gas distribution plate, the reaction gas inlet being arranged below the gas diffusion holes, the reaction gas entering the reactor cavity through the reaction gas inlet and forming a small gas flow through the gas diffusion holes opened in the gas distribution plate, and finally entering the reaction channels formed by the microreactor;

[0013] The catalytic reaction frame is fixedly installed in a rectangular array on the gas distribution plate, is inserted into the reaction channel of the micro reactor in a one-to-one correspondence, and comprises a fiber light tube strip and a vortex generator, wherein the vortex generator is provided with not less than two groups, is fixedly connected with the fiber light tube strip, is supported by the fiber light tube strip to be distributed at different heights in the reaction channel, and comprises a Venturi tube and a spoiler, wherein the spoiler is fixedly installed at the gas outlet end of the Venturi tube, blocks the gas passing through the Venturi tube to generate the Karman vortex street phenomenon, and further breaks the boundary layer of the reaction gas to improve the efficiency of the photocatalytic reaction.

[0014] Preferably, the catalytic wall plate is provided with gas holes and splicing grooves, the gas holes are one or a combination of triangle, quadrilateral, pentagon, hexagon and circle, and the three-dimensional connecting channels for gas flow are formed in the micro reactor through the gas holes.

[0015] Preferably, the reaction gas inlet is used for introducing carbon dioxide and water vapor required for reaction, and the reaction product outlet is used for discharging the reaction product.

[0016] Preferably, the reactor body above the shell is further provided with a sampling port, and the sampling port is connected with a gas sampling system.

[0017] Preferably, the gas sampling system comprises an external sampling tube, a gas box, a hollow pump, an exhaust pipe and a magnetic valve, the hollow pump is communicated with the gas box through a pipeline, the magnetic valves are respectively installed on the pipe bodies at two ends of the gas box, and the pipe bodies at two ends of the gas box are communicated with the external sampling tube and the exhaust pipe through the magnetic valves.

[0018] Preferably, the shell is further provided with a mounting groove for inserting the catalytic wall plate of the micro reactor.

[0019] Preferably, the vortex generator is provided with two, the Venturi tube is a hollow pipe body structure with the smallest middle pipe diameter and continuously increasing pipe diameters on both sides, the gas bag groove is further provided at the smallest pipe diameter of the Venturi tube, the pipe diameter adjusting film is provided outside the gas bag groove, the inflation degree of the pipe diameter adjusting film is adjusted by pumping air into the gas bag groove, and the pipe diameter of the Venturi tube is adjusted.

[0020] Preferably, the gas bag groove provided on the Venturi tube is communicated with the pump air pipe provided outside the shell through the gas channel provided on the Venturi tube and the fiber light tube strip, the pump air pipe is provided with a pair, and the same pump air pipe is used for synchronously adjusting the pipe diameters of the Venturi tubes arranged at the same height.

[0021] The pump air pipe is communicated with the double-way air pump through a three-way pipe, and the double-way air pump is used to adjust the pipe diameter of the Venturi tube at the same height.

[0022] Compared with the prior art, the present application has the following advantages:

[0023] The micro-reactor structure is spliced in layers, the contact area of the gas and the catalytic wall plate is increased through the air holes on the catalytic wall plate, and the Venturi tube and the spoiler are arranged in the reaction channel, the gas passing through the Venturi tube is blocked by the spoiler to generate the Karman vortex street phenomenon, so that the vortex is formed in the reaction channel, the boundary layer of the reaction gas is broken, and the efficiency of the photocatalytic reaction is improved. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is an overall structure explosion schematic diagram of the present application;

[0025] Figure 2 It is a local enlarged structure sectional view schematic diagram of the catalytic reaction frame of the present application;

[0026] Figure 3 It is a catalytic reaction frame connection structure schematic diagram of the present application;

[0027] Figure 4 It is a horizontal direction sectional view schematic diagram of the shell of the present application;

[0028] Figure 5 It is an overall structure schematic diagram of the micro-reactor of the present application;

[0029] Figure 6 It is an overall structure schematic diagram of the present application;

[0030] Figure 7 It is a catalytic wall plate structure schematic diagram of the present application;

[0031] Figure 8 It is a reaction gas inlet and reaction product outlet installation position schematic diagram of the present application.

[0032] In the figure: 1 reactor body, 2 base, 3 shell, 4 top cover, 5 micro-reactor, 6 catalytic wall plate, 7 reaction channel, 8 reaction gas inlet, 9 reaction product outlet, 10 gas distribution plate, 11 gas diffusion hole, 12 catalytic reaction frame, 13 optical fiber lamp strip, 14 vortex generator, 15 Venturi tube, 16 spoiler, 17 air hole, 18 splicing groove, 19 sampling port, 20 external sampling tube, 21 gas box, 22 hollow pump, 23 exhaust pipe, 24 magnetic control valve, 25 installation groove, 26 air bag groove, 27 pipe diameter adjusting film, 28 pump air pipe, 29 regulating electromagnetic valve, 30 three-way pipe. DETAILED DESCRIPTION

[0033] The technical solutions in the embodiments of the present application will be clearly and completely described 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 of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0034] Please refer to Figures 1-8 The present application provides a technical solution:

[0035] Embodiment one:

[0036] A photocatalytic carbon dioxide reduction reaction device, comprising:

[0037] A reactor body 1, the reactor body 1 is composed of a base 2, an outer shell 3 and a top cover 4, and the base 2, the outer shell 3 and the top cover 4 form a reactor inner cavity;

[0038] A microreactor 5, the microreactor 5 is composed of a plurality of vertically stacked and staggered catalytic wall plates 6, and forms a plurality of rectangular array arranged reaction channels 7 from bottom to top, and the catalytic wall plates 6 are coated with a photocatalyst;

[0039] An inlet and outlet, the inlet and outlet includes a reaction gas inlet 8 and a reaction product outlet 9, the reaction gas inlet 8 is arranged below the outer shell 3, the reaction product outlet 9 is arranged above the outer shell 3, and the reaction gas inlet 8 and the reaction product outlet 9 are both in communication with the inside of the reactor inner cavity;

[0040] A gas distribution plate 10, the gas distribution plate 10 is fixedly installed on the assembly groove in the outer shell 3, the gas distribution plate 10 is provided with a plurality of gas diffusion holes 11 in a rectangular array corresponding to the reaction channels 7, the microreactor 5 is fixedly installed above the gas distribution plate 10, the reaction gas inlet 8 is arranged below the gas diffusion holes 11, the reaction gas enters the reactor inner cavity through the reaction gas inlet 8, passes through the gas diffusion holes 11 in the gas distribution plate 10 to form a small gas flow, and finally enters the reaction channels 7 formed by the microreactor 5;

[0041] The catalytic reaction frame 12 is fixedly installed on the gas distribution plate 10 in a rectangular array. The catalytic reaction frame 12 is inserted into the reaction channel 7 of the microreactor 5 in a one-to-one correspondence. The catalytic reaction frame 12 includes fiber optic lamp strips 13 and eddy current generators 14. There are no less than two sets of eddy current generators 14. The eddy current generators 14 are fixedly connected to the fiber optic lamp strips 13. The fiber optic lamp strips 13 support the eddy current generators 14 so that they are distributed at different heights in the reaction channel 7. The eddy current generator 14 includes a venturi tube 15 and a turbulence blunt body 16. The turbulence blunt body 16 is fixedly installed at the gas outlet end of the venturi tube 15. The turbulence blunt body 16 blocks the gas passing through the venturi tube 15, thereby generating a Karman vortex street phenomenon, which breaks the boundary layer of the reaction gas and improves the efficiency of the photocatalytic reaction.

[0042] In this embodiment, the reactor body 1 serves as the main structure of the reaction, consisting of a top cover 4, an outer shell 3, and a base 2 arranged at the top, middle, and bottom. The base 2, outer shell 3, and top cover 4 enclose the reactor cavity, and a microreactor 5 is disposed within this cavity. The microreactor 5 is composed of several vertically stacked and interlaced catalytic wall plates 6, forming a three-dimensional airflow channel. The catalytic wall plates 6 are coated with a photocatalyst, and gas reacts with the photocatalyst to generate gas. The outer shell 3 also has mounting slots 25 for inserting the catalytic wall plates 6 of the microreactor 5, ensuring stable installation of the microreactor 5 within the outer shell 3. In this embodiment, the reaction gas... The gas consists of vapor and carbon dioxide. The reaction gas inlet 8 is used to introduce the carbon dioxide and water vapor required for the reaction, and the reaction product outlet 9 is used to discharge the reaction products. Both the reaction gas inlet 8 and the reaction product outlet 9 are located on the outer shell 3. The catalytic wall plate 6 has pores 17 and splicing grooves 18. The pores 17 are regular polygonal or circular openings, thus forming a three-dimensional connecting channel for gas flow inside the microreactor 5. The splicing grooves 18 are used for assembling the microreactor 5. Gas flows from bottom to top through the gas distribution plate 10 located at the bottom of the microreactor 5, and gas diffusion holes 11 are provided on the gas distribution plate 10. (Refer to the attached instruction manual.) Figure 3It can be seen that the gas diffusion holes 11 are located directly below each reaction channel, the reaction gas enters the reactor cavity through the reaction gas inlet 8, and passes through the gas diffusion holes 11 opened on the gas distribution plate 10 to form a small gas flow, and finally enters the reaction channel 7 formed by the microreactor 5, in addition, the catalytic reaction frame 12 is inserted in the reaction channel 7, a group of catalytic reaction frames 12 are opened in each reaction channel 7, the catalytic reaction frame 12 includes a fiber light pipe strip 13 and a vortex generator 14, the fiber light pipe strip 13 is used to connect the external circuit to provide sufficient light environment for the reaction, the fiber light pipe strip 13 is fixedly installed on the pipe strip structure to form a fiber light bead, and the fiber light pipe strip 13 also serves as a support mechanism of the vortex generator 14, the vortex generator 14 includes a Venturi tube 15 and a turbulence bluff body 16, the Venturi tube 15 is a hollow pipe structure with the smallest intermediate pipe diameter and continuously increasing pipe diameters on both sides, the gas flow increases after passing through the Venturi tube due to the decrease of the pipe diameter, and the turbulence bluff body 16 is arranged at the outlet end of the Venturi tube 15, so that the passing gas flow forms a Karman vortex street, the Karman vortex street refers to the alternating vortex column formed downstream of the object when the fluid passes around the bluff body, which is a classic phenomenon in fluid dynamics, the formation of the Karman vortex street can make the gas flow passing through the Venturi tube 15 form a vortex, so as to break the boundary layer of the reaction gas, and then play a role in improving the photocatalytic reaction, the setting of the catalytic reaction frame makes the reaction gas flow form a stable vortex without the need to introduce electrical components, and the setting of no less than two groups of vortex generators makes the gas flowing through the reaction channel 7 fully contact the surface of the catalytic wall plate 6, so as to improve the reaction rate.

[0043] Example two:

[0044] The reactor body 1 above the shell 3 is also provided with a sampling port 19, and the sampling port 19 is connected with a gas sampling system.

[0045] The gas sampling system includes an external sampling pipe 20, a gas box 21, a hollow pump 22, an exhaust pipe 23 and a magnetic valve 24, the hollow pump 22 is communicated with the gas box 21 through a pipeline, the magnetic valves 24 are respectively installed on the pipe bodies at both ends of the gas box 21, and the pipe bodies at both ends of the gas box 21 are communicated with the external sampling pipe 20 and the exhaust pipe 23 through the magnetic valves 24.

[0046] In this embodiment, a sampling port 19 is arranged on the surgical 3, and communicates with the reactor body 1 through the sampling port 19, the structure of the reactor body 1 is fully disclosed, the magnetic valve 24 is arranged on the pipe body at both ends of the gas box 21, so that the conduction of different path pipe bodies can be carried out, and the gas is introduced into the gas box 21 in the negative pressure extraction process of the hollow pump 22, so that the gas is finally discharged from the exhaust pipe 23, and then the gas recovery pipe can be communicated on the gas box 21, so that the gas in the gas box 21 is further recovered into the reactor cavity, so that the gas recovery is fully carried out.

[0047] Embodiment three:

[0048] The vortex generator 14 is provided with two, the venturi 15 is a hollow pipe body structure with the minimum intermediate pipe diameter and the continuously increased pipe diameter on both sides, the gas bag groove 26 is also arranged at the minimum pipe diameter of the venturi 15, the pipe diameter adjusting film 27 is arranged outside the gas bag groove 26, the inflation degree of the pipe diameter adjusting film 27 is adjusted by pumping air into the gas bag groove 26, and the pipe diameter of the venturi 15 is adjusted.

[0049] In this embodiment, the gas bag groove 26 is further arranged at the minimum pipe diameter of the venturi 15, and the pipe diameter adjusting film 27 is arranged outside the gas bag groove 26, so that the pipe diameter can be adjusted by pumping air operation, which has the significance of adjusting the air flow through the venturi 15, thereby adjusting the vortex rotation speed of the gas formed behind the blunt body, and adjusting the reaction rate.

[0050] Embodiment four:

[0051] The gas bag groove 26 arranged on the venturi 15 is communicated with the pump air pipe 28 arranged outside the shell 3 through the venturi 15 and the air duct arranged on the optical fiber lamp strip 13, the pump air pipe 28 is arranged in pairs, and the same pump air pipe 28 is used to synchronously adjust the pipe diameter of a plurality of venturis 15 arranged at the same height.

[0052] The pump air pipe 28 is provided with a control electromagnetic valve 29, the pump air pipe 28 is communicated with a bidirectional air pump through a three-way pipe 30, and the pipe diameter of the venturi 15 at the same height is adjusted by the bidirectional air pump.

[0053] In this embodiment, the adjustment mode of the pipe diameter adjusting film 27 is further disclosed, and the adjustment mode of the pipe diameter adjusting film 27 is further disclosed, and the adjustment mode of the pipe diameter adjusting film 27 is further disclosed. Figure 2 and 3Each Venturi tube 15 is supported by four optical fiber lamp strips 13 arranged at the corners, two of which are hollow structures, and the air passages inside are respectively communicated with the air bag grooves 26 in the Venturi tubes 15 at different heights. The air passages inside the optical fiber lamp strips 13 are communicated with a two-way air pump through a pump air pipe 28, and the air pump is not shown in the figure. The two-way air pump pumps air into a three-way pipe 30, and according to the need, the corresponding control electromagnetic valve 29 is opened, so that the gas enters the corresponding optical fiber lamp strip 13, and finally enters the air bag groove 26 of the Venturi tube 15 at the corresponding height, thereby synchronously adjusting the inner diameter of the Venturi tube 15 at the same height.

[0054] Although embodiments of the present application have been shown and described, it is to be understood that various modifications, substitutions, replacements and changes can be made to these embodiments without departing from the principles and spirit of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A photocatalytic carbon dioxide reduction reaction device, characterized in that, include: The reactor body consists of a base, an outer shell, and a top cover, which together form the reactor cavity. The microreactor is composed of several vertically stacked and staggered catalytic wall plates, which are spliced ​​together to form several rectangular arrays of reaction channels from bottom to top. The catalytic wall plates are coated with photocatalysts. The inlet and outlet include a reaction gas inlet and a reaction product outlet. The reaction gas inlet is located at the bottom of the outer shell, and the reaction product outlet is located at the top of the outer shell. Both the reaction gas inlet and the reaction product outlet are connected to the interior of the reactor cavity. A gas distribution plate is fixedly installed on an assembly slot inside the outer shell. The gas distribution plate has gas diffusion holes arranged in a rectangular array, corresponding one-to-one with the reaction channels. The microreactor is fixedly installed above the gas distribution plate. The reaction gas inlet is located below the gas diffusion holes. The reaction gas enters the inner cavity of the reactor through the reaction gas inlet and passes through the gas diffusion holes on the gas distribution plate to form a small gas flow, which finally enters the reaction channel formed by the microreactor. A catalytic reaction frame is fixedly mounted in a rectangular array on a gas distribution plate. Each catalytic reaction frame is inserted one-to-one into the reaction channel of the microreactor. The catalytic reaction frame includes fiber optic lamp strips and eddy current generators. At least two sets of eddy current generators are provided, and each eddy current generator is fixedly connected to the fiber optic lamp strips. The fiber optic lamp strips support the eddy current generators, allowing them to be distributed at different heights within the reaction channel. Each eddy current generator includes a Venturi tube and a turbulence-disrupting blunt body. The turbulence-disrupting blunt body is fixedly mounted at the gas outlet end of the Venturi tube. By obstructing the gas passing through the Venturi tube, the turbulence-disrupting blunt body generates a Karman vortex street phenomenon, thereby breaking the boundary layer of the reactant gas and improving the efficiency of the photocatalytic reaction. The eddy current generator is provided in two parts. The Venturi tube is a hollow tube structure with the smallest diameter in the middle and the diameters of the two sides continuously increasing. An air bladder groove is also provided at the smallest diameter of the Venturi tube. A diameter adjustment membrane is provided on the outside of the air bladder groove. The expansion degree of the diameter adjustment membrane is adjusted by inflating or deflating the air bladder groove, thereby adjusting the diameter of the Venturi tube. The air bladder groove at the minimum diameter of the Venturi tube is connected to the pump extraction pipe on the outside of the outer shell via the air passage on the Venturi tube and the fiber optic lamp strip. There is a pair of pump extraction pipes, and the same pump extraction pipe is used to simultaneously adjust the diameter of several Venturi tubes set at the same height.

2. The photocatalytic carbon dioxide reduction reaction device according to claim 1, characterized in that: The catalytic wall plate has pores and splicing grooves. The pores are one or more combinations of triangles, quadrilaterals, pentagons, hexagons, and circles, forming a three-dimensional connecting channel for gas flow inside the microreactor.

3. The photocatalytic carbon dioxide reduction reaction device according to claim 1, characterized in that: The reaction gas inlet is used to introduce carbon dioxide and water vapor required for the reaction, and the reaction product outlet is used to discharge the products generated in the reaction.

4. The photocatalytic carbon dioxide reduction reaction device according to claim 1, characterized in that: A sampling port is also provided on the reactor body above the outer shell, and a gas sampling system is connected to the sampling port.

5. The photocatalytic carbon dioxide reduction reaction device according to claim 4, characterized in that: The gas sampling system includes an external sampling tube, a gas box, a hollow pump, an exhaust pipe, and a magnetic valve. The hollow pump is connected to the gas box through a pipe. Magnetic valves are installed on the pipes at both ends of the gas box. The pipes at both ends of the gas box are connected to the external sampling tube and the exhaust pipe, respectively, through the magnetic valves.

6. The photocatalytic carbon dioxide reduction reaction device according to claim 1, characterized in that: The outer shell is also provided with an installation groove for inserting the catalytic wall plate of the microreactor.

7. The photocatalytic carbon dioxide reduction reaction device according to claim 6, characterized in that: Each pump extraction pipe is equipped with a control solenoid valve. The pump extraction pipe is connected to a bidirectional air pump via a three-way pipe. The bidirectional air pump is used to adjust the diameter of the venturi tube at the same height.

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