High-pressure-resistant gas-solid phase photo-thermal reaction device for fixed bed

Abstract

The invention belongs to the technical field of catalytic equipment, and particularly relates to a high-pressure-resistant gas-solid phase photo-thermal reaction device for a fixed bed. When the high-pressure-resistant gas-solid phase photo-thermal reaction device for the fixed bed works, reaction gas enters a reaction tube main body through a gas inlet in the upper part of the reaction tube main body; reaction gas flows through a catalyst on the porous catalyst placing platform, gas reaction is accelerated, then the reaction gas is discharged through the gas outlet in the lower portion of the reaction tube body, the volume of an inner cavity of the reaction tube body is reduced through the arrangement of the tube body, the flow speed of the gas in the reaction tube body is reduced, and the contact time of the gas and the catalyst is prolonged. Meanwhile, due to the arrangement of the porous catalyst placing platform, the contact area between the gas and the catalyst is increased, the reaction rate of the gas is further increased, and the gas conversion rate and the yield are higher.

Description

Technical Field

[0001] The present invention belongs to the technical field of catalytic equipment, and particularly relates to a high-pressure-resistant gas-solid phase photothermal reaction device for a fixed bed. Background Art

[0002] Heterogeneous catalysis, as an important form of modern industrial catalytic technology, its core characteristic lies in that the catalytic reaction occurs in a multi-phase interface system such as solid-liquid, solid-gas or liquid-gas. Through the selective adsorption and activation of reactants by the active sites on the surface of the solid catalyst, the reaction activation energy is significantly reduced and the rearrangement of surface chemical bonds is promoted, and finally the controllable desorption of products is realized. With the recyclability of the catalytic system, high process cleanliness and the feasibility of large-scale industrial applications, this technology has formed industrial applications in the fields of chemical synthesis, drug preparation and pollution control. However, its technical bottlenecks are also relatively significant, mainly reflected in the weakening of catalyst activity by surface poisoning effects, mass transfer limitation caused by microporous structures, and insufficient utilization rate of reaction centers in heterogeneous systems.

[0003] As a typical continuous flow reaction system, the fixed bed reactor has significant advantages because the gas-solid two-phase exhibits a plug flow characteristic along the axial direction: the orderly distribution of its concentration gradient along the axial direction significantly inhibits the backmixing phenomenon, and the maintenance of the concentration gradient of reactants per unit volume is conducive to promoting the reaction kinetics process. By precisely controlling the reaction temperature field and pressure field, this type of reactor is irreplaceable in chemical process intensification and laboratory catalytic performance evaluation. However, it should be noted that the traditional fixed bed reactor has inherent limitations in structural design: the conventional pipe diameter setting leads to a reduction in the axial contact time between reactants and the catalyst, significantly weakening the space-time conversion efficiency of the intrinsic active sites of the catalyst; more critically, the limited laminar gas distribution mode can only achieve the surface flux of catalyst particles, and lacks the penetration effect on the three-dimensional structure of the catalyst, resulting in the mass transfer process at the gas-solid interface being restricted by the laminar mass transfer theory limit, and ultimately causing a significant attenuation of the macroscopic catalytic efficiency.

[0004] Therefore, a high-pressure-resistant gas-solid phase photothermal reaction device for a fixed bed is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-pressure-resistant gas-solid phase photothermal reaction device for a fixed bed to solve the above problems.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] A high-pressure-resistant gas-solid phase photothermal reaction device for a fixed bed, comprising: a reaction tube body, a light window is arranged at the top end of the reaction tube body, a tube body is coaxially penetrated in the reaction tube body, the top end of the tube body is hermetically arranged, a gap is left between the outer side wall of the tube body and the inner side wall of the reaction tube body, the tube body is located at the lower part of the reaction tube body, the bottom end of the reaction tube body is hermetically arranged, an air inlet and an air outlet are communicated on the outer side wall of the reaction tube body, the air outlet is located at the lower part of the reaction tube body, the air inlet is located at the upper part of the reaction tube body, a porous catalyst placement platform is further arranged in the reaction tube body, the porous catalyst placement platform is located above the tube body and between the air inlet and the air outlet, and a catalyst is arranged on the porous catalyst placement platform.

[0008] In the high-pressure-resistant gas-solid phase photothermal reaction device for a fixed bed of the present invention, a third flange is fixedly connected to the bottom end of the reaction tube body, the third flange is coaxially arranged with the reaction tube body, a fourth flange is fixedly installed on the third flange, and the bottom end of the tube body is coaxially and fixedly connected to the fourth flange.

[0009] In the high-pressure-resistant gas-solid phase photothermal reaction device for a fixed bed of the present invention, the light window includes a second flange coaxially and fixedly connected to the top end of the reaction tube body, a first flange is coaxially and fixedly connected to the second flange, and a light-transmitting member is arranged between the first flange and the second flange.

[0010] In the high-pressure-resistant gas-solid phase photothermal reaction device for a fixed bed of the present invention, a first convex groove is circumferentially and fixedly connected to the bottom surface of the third flange, the first convex groove is coaxially arranged with the third flange, a third groove is circumferentially formed on the top surface of the fourth flange, the third groove is located outside the tube body, the third groove is coaxially arranged with the fourth flange, the first convex groove extends into the third groove, and an O-ring is arranged between the first convex groove and the third groove.

[0011] In the high-pressure-resistant gas-solid phase photothermal reaction device for a fixed bed of the present invention, a limiting protrusion is fixedly connected to the bottom end of the fourth flange.

[0012] In the high-pressure-resistant gas-solid phase photothermal reaction device for a fixed bed of the present invention, a threaded hole is formed in the limiting protrusion, the threaded hole is coaxially arranged with the tube body, and the threaded hole is communicated with the inner cavity of the tube body.

[0013] In the high-pressure resistant gas-solid phase photothermal reaction device for fixed bed of the present invention, a first stepped groove is circumferentially formed on the bottom surface of the first flange. The first stepped groove is located at the inner edge of the first flange and is coaxially arranged with the first flange. A second stepped groove is circumferentially formed on the top surface of the second flange. The second stepped groove is located at the inner edge of the second flange and is coaxially arranged with the second flange. The outer edge of the light-transmitting member is located between the first stepped groove and the second stepped groove.

[0014] In the high-pressure resistant gas-solid phase photothermal reaction device for fixed bed of the present invention, another O-ring is circumferentially arranged on the bottom wall of the second stepped groove, and the light-transmitting member abuts against the O-ring.

[0015] In the high-pressure resistant gas-solid phase photothermal reaction device for fixed bed of the present invention, a limiting member is fixedly connected to the top end of the pipe body. The limiting member is located inside the reaction tube main body, and the porous catalyst placement platform is arranged on the limiting member.

[0016] In the high-pressure resistant gas-solid phase photothermal reaction device for fixed bed of the present invention, a first snap ring and a second snap ring are coaxially and fixedly connected to the outer side wall of the reaction tube main body. The first snap ring and the second snap ring are respectively close to both ends of the reaction tube main body.

[0017] Compared with the prior art, the present invention has the following advantages and technical effects:

[0018] When the high-pressure resistant gas-solid phase photothermal reaction device for fixed bed of the present invention is working, the reaction gas enters the reaction tube main body through the air inlet at the upper part of the reaction tube main body. The reaction gas flows through the catalyst on the porous catalyst placement platform to accelerate the gas reaction, and then is discharged through the air outlet at the lower part of the reaction tube main body. The setting of the pipe body reduces the volume of the inner cavity of the reaction tube main body, reduces the flow rate of the gas in the reaction tube main body, increases the contact time between the gas and the catalyst, and improves the efficiency of changing the atmosphere during use. At the same time, the setting of the porous catalyst placement platform increases the contact area between the gas and the catalyst, further improves the reaction rate of the gas, makes the gas conversion rate higher and the output higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the following described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings:

[0020] Figure 1 It is a top view of the present invention;

[0021] Figure 2This is the front view of the present invention;

[0022] Figure 3 This is the schematic diagram of the internal structure of the present invention;

[0023] Figure 4 This is the comparison chart of the hydrogen production performance under pure thermal conditions of the methanol steam reforming reaction between the glass reaction tube and the reaction device of the present invention;

[0024] Figure 5 This is the comparison chart of the hydrogen production performance of the reaction device of the present invention under pure thermal and photo-thermal coupling conditions of the methanol steam reforming reaction;

[0025] Figure 6 This is the comparison chart of the hydrogen production performance of the methanol steam reforming reaction under pure thermal and photo-thermal coupling conditions in the reaction device of the present invention with a quartz glass sheet and a porous catalyst placement platform;

[0026] Figure 7 This is the comparison chart of the gas flow at the porous catalyst placement platform and the quartz glass sheet in the present invention;

[0027] Wherein, 1. Reaction tube main body; 2. First flange; 3. Second flange; 4. Air inlet; 5. First snap ring; 6. Second snap ring; 7. Air outlet; 8. Third flange; 9. Fourth flange; 10. Limit projection; 11. Light window; 12. First step groove; 13. Second step groove; 14. Limiting member; 15. First convex groove; 16. Third groove; 17. Translucent member. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the drawings and specific implementation manners.

[0030] Refer to Figures 1 to 3, the present invention discloses a high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed, comprising: a reaction tube main body 1, a light window 11 is arranged at the top of the reaction tube main body 1, a tube body is coaxially penetrated in the reaction tube main body 1, the top of the tube body is hermetically arranged, a gap is left between the outer side wall of the tube body and the inner side wall of the reaction tube main body 1, the tube body is located in the lower part of the reaction tube main body 1, the bottom of the reaction tube main body 1 is hermetically arranged, an air inlet 4 and an air outlet 7 are communicated with the outer side wall of the reaction tube main body 1, the air outlet 7 is located in the lower part of the reaction tube main body 1, the air inlet 4 is located in the upper part of the reaction tube main body 1, a porous catalyst placement platform is further arranged in the reaction tube main body 1, the porous catalyst placement platform is located above the tube body and between the air inlet 4 and the air outlet 7, and the catalyst is arranged on the porous catalyst placement platform.

[0031] When the high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed of the present invention is working, the reaction gas enters the reaction tube main body 1 through the air inlet 4 in the upper part of the reaction tube main body 1, the reaction gas flows through the catalyst on the porous catalyst placement platform, accelerating the gas reaction, and then is discharged through the air outlet 7 in the lower part of the reaction tube main body 1. The setting of the tube body reduces the volume of the inner cavity of the reaction tube main body 1, reduces the flow rate of the gas in the reaction tube main body 1, increases the contact time between the gas and the catalyst, improves the efficiency of changing the atmosphere during use, and can reach 300 °C and 3 Mpa in the actual use process; meanwhile, the setting of the porous catalyst placement platform increases the contact area between the gas and the catalyst, further improves the reaction rate of the gas, makes the gas conversion rate higher and the output higher.

[0032] The reaction tube main body 1 is a straight tube, and the processing and manufacturing process becomes simple;

[0033] The incident light source directly irradiates the catalyst on the horizontally placed porous catalyst placement platform through the light window 11 at the top of the reaction tube main body 1, and has a higher irradiation density compared with the "T"-type reaction tube, which can significantly improve the light gain effect in the photothermal coupling reaction;

[0034] In a feasible solution, a third flange 8 is fixedly connected to the bottom end of the reaction tube main body 1, the third flange 8 is coaxially arranged with the reaction tube main body 1, a fourth flange 9 is fixedly installed on the third flange 8, and the bottom end of the tube body is coaxially and fixedly connected to the fourth flange 9.

[0035] The tube body is fixedly installed in the lower part of the reaction tube main body 1 through the fourth flange 9, and the installation is more convenient.

[0036] The material of the tube body is steel.

[0037] In a feasible solution, the light window 11 includes a second flange 3 coaxially and fixedly connected to the top end of the reaction tube main body 1, a first flange 2 is coaxially and fixedly connected to the second flange 3, and a light transmissive member 17 is arranged between the first flange 2 and the second flange 3.

[0038] The light-transmitting member 17 is clamped and fixed to the top end of the reaction tube body 1 through the first flange 2 and the second flange 3.

[0039] The light-transmitting member 17 is high-pressure-resistant sapphire glass.

[0040] In a feasible solution, a first convex groove 15 is circumferentially and fixedly connected to the bottom surface of the third flange 8. The first convex groove 15 is coaxially arranged with the third flange 8. A third concave groove 16 is circumferentially formed on the top surface of the fourth flange 9. The third concave groove 16 is located outside the tube body. The third concave groove 16 is coaxially arranged with the fourth flange 9. The first convex groove 15 extends into the third concave groove 16, and an O-ring is arranged between the first convex groove 15 and the third concave groove 16.

[0041] By providing the mutually adapted first convex groove 15 and the third concave groove 16, and simultaneously arranging an O-ring between the first convex groove 15 and the third concave groove 16, the sealing performance of the connection between the third flange 8 and the fourth flange 9 is enhanced.

[0042] In a feasible solution, a limiting projection 10 is fixedly connected to the bottom end of the fourth flange 9.

[0043] The cross-section of the limiting projection 10 is a regular hexagon. The reaction tube body 1 can be disassembled by clamping the limiting projection 10 with a bench vice.

[0044] In a feasible solution, a threaded hole is formed in the limiting projection 10. The threaded hole is coaxially arranged with the tube body and communicates with the inner cavity of the tube body.

[0045] The thermocouple can be installed on the limiting projection 10 through the threaded hole, and the measuring end of the thermocouple extends into the top end of the tube body to realize the temperature measurement of the catalyst placement area.

[0046] In a feasible solution, a first stepped groove 12 is circumferentially formed on the bottom surface of the first flange 2. The first stepped groove 12 is located at the inner edge of the first flange 2 and is coaxially arranged with the first flange 2. A second stepped groove 13 is circumferentially formed on the top surface of the second flange 3. The second stepped groove 13 is located at the inner edge of the second flange 3 and is coaxially arranged with the second flange 3. The outer edge of the light-transmitting member 17 is located between the first stepped groove 12 and the second stepped groove 13.

[0047] The outer edge of the light-transmitting member 17 is located between the first stepped groove 12 and the second stepped groove 13, preventing the light-transmitting member 17 from shifting and affecting the light illumination.

[0048] In a feasible solution, another O-ring is circumferentially arranged on the bottom wall of the second stepped groove 13. The light-transmitting member 17 abuts against the O-ring. The sealing performance of the connection between the second stepped groove 13 and the light-transmitting member 17 is increased.

[0049] In a feasible solution, a limiting member 14 is fixedly connected to the top end of the pipe body. The limiting member 14 is located inside the reaction tube main body 1, and the porous catalyst placement platform is arranged on the limiting member 14.

[0050] The limiting member 14 is a circular porous plate for placing the porous catalyst placement platform.

[0051] In a feasible solution, a first clamping ring 5 and a second clamping ring 6 are coaxially and fixedly connected to the outer side wall of the reaction tube main body 1. The first clamping ring 5 and the second clamping ring 6 are respectively close to both ends of the reaction tube main body 1.

[0052] The first clamping ring 5 and the second clamping ring 6 are provided to facilitate fixing the reaction tube main body 1 in the heating sleeve.

[0053] The first specific example:

[0054] The inner diameter of the reaction tube main body 1 is 25 - 40 mm, the outer diameter is 27 - 45 mm, the wall thickness is 2 - 5 mm, and the total length is 30 - 50 cm;

[0055] The width of the second flange ring is 5 - 10 mm, and the width of the third flange ring is 2 - 5 mm;

[0056] The distance between the first clamping ring 5 and the second flange 3 is 2 - 10 cm, and the distance between the second clamping ring 6 and the third flange 8 is 2 - 10 cm;

[0057] Threads are provided on both the air inlet 4 and the air outlet 7;

[0058] The inner diameter of the first flange 2 is equal to the inner diameter of the reaction tube main body 1;

[0059] The difference between the outer diameter of the pipe body and the inner diameter of the reaction tube main body 1 is 1 - 3 mm, the radius of the threaded hole is 2 - 4 mm, and the thickness of the limiting protrusion 10 is 5 - 10 mm.

[0060] The thickness of the light-transmitting member 17 is 0.5 - 10 cm;

[0061] The porous catalyst placement platform is made of porous materials with chemical inertness, including but not limited to glass sand core, microporous breathable corundum ceramic sheet, micron silicon carbide foam ceramic sheet, etc.

[0062] Synthesis method of the porous catalyst placement platform:

[0063] Al 2 O 3Mix with calcium aluminate cement according to a mass ratio of 7:3, and dry mix by ball milling for 30 min (200 r / min) to obtain a composite sintering aid. Weigh 100 g of the composite sintering aid and mix it with 300 g of deionized water in a beaker. After magnetic stirring (800 r / min) at 40 °C for 4 h, let it stand in an oven at 40 °C for 12 h. After standing, stir for 1 h, then place it in an oven at 110 °C to dry to constant weight, and finally pass through a sieve (325 mesh) to obtain a premixed powder.

[0064] Place silicon carbide, premixed powder, and graphite (pore former) with a mass ratio of 87.5:12.5:15 in a high-efficiency mixer and dry mix for 1 h to obtain a mixed powder. Use a stirrer to stir the mixed powder and PVA solution (10% of the mass of the mixed powder) evenly to obtain a mud material. After the mud material is aged for 24 h, place it in a steel mold, form it under a pressure of 35 Mpa, air dry naturally for 24 h after demolding, then dry it in an oven at 110 °C for 24 h, and finally calcine it in an air atmosphere at 1450 °C for 3 h to obtain a porous ceramic material (heating rate 2 °C / min, cooling rate 5 °C / min). The size of the obtained porous ceramic material is Ф28 mm × 2 mm, which is the porous catalyst placement platform.

[0065] The second specific example: Use a quartz glass reaction tube (inner diameter 1 cm, outer diameter 2 cm) and the reaction device of the present invention to carry out the methanol steam reforming reaction. The catalyst is the same catalyst, and the carrier gas (N 2 ) flow rate is 30 ml / min, and the methanol-water (molar ratio 1:1) flow rate is 0.05 ml / min. The reaction temperature and pressure are 210 °C and 0.1 Mpa respectively; when using the quartz glass reaction tube, the catalyst is clamped in the middle of the quartz glass reaction tube with quartz wool. When using the reaction device of the present invention, the catalyst is placed on the porous catalyst placement platform, and the catalyst dosage is 30 mg; after the substrate passes through the fixed bed reaction, measure the tail gas flowing out of the fixed bed to obtain the tail gas flow rate, and calibrate the tail gas hydrogen by gas chromatography to calculate the hydrogen production. The results are as Figure 4 shown. Under the same reaction conditions, different hydrogen production amounts are measured for the two reaction tubes, indicating that the reaction device of the present invention has a higher substrate conversion rate and product yield. The reason is that the reaction device of the present invention has a larger inner diameter than the quartz glass reaction tube. Under the same feed of reactants and carrier gas, the gas flow rate in the reaction device of the present invention is slower, and the contact time between the substrate and the catalyst is longer, so that the substrate conversion is more complete and the product yield is higher. Therefore, it has the characteristic of high conversion, and this characteristic can be extended to the photothermal coupling reaction.

[0066] The third specific example: Use the reaction device of the present invention to carry out the photothermal methanol steam reforming reaction. In this example, the catalyst is the same as that in the second specific example, and the carrier gas (N 2The flow rate is 30 ml / min, the flow rate of methanol-water (molar ratio 1:1) is 0.05 ml / min, the reaction temperature and pressure are 190 °C and 0.1 Mpa respectively, and the light power density of the light source used is 500 mW·cm -2 , and the hydrogen production under the pure thermal and photothermal coupling reaction conditions is as Figure 5 shown. The hydrogen production under the photothermal coupling reaction conditions is significantly more than that under the pure thermal reaction conditions, indicating that the present invention has universality for photothermal coupling type reactions.

[0067] The fourth specific example: Using the reaction device of the present invention, three reaction tube bodies 1 are provided. A porous catalyst placement platform carrying a catalyst is placed in one reaction tube body 1, a quartz glass sheet is placed in another reaction tube body 1, and only the porous catalyst placement platform is placed in the third one; other conditions are the same as those in the third specific example; the hydrogen production rates of the quartz glass sheet and the porous ceramic material under pure thermal and photothermal coupling conditions are calculated as shown in the appendix Figure 6 shown;

[0068] Using the porous catalyst placement platform of the present invention can significantly increase the hydrogen production both under pure thermal and photothermal coupling conditions. The reason is that when the gas flow passes through the reaction tube body 1, since the quartz glass sheet blocks the passage of the gas flow, the gas flow flows from the side, and the mass transfer between the gas flow and the catalyst only occurs on the surface of the catalyst. Moreover, the by-products generated by the reaction will accumulate on the glass sheet and thus poison the catalyst; while due to the rich pore structure of the porous catalyst placement platform, the gas flow can pass through the catalyst, improving the mass transfer effect. At the same time, the generated by-products seep out through the pores, preventing the catalyst from being poisoned. The schematic diagrams of the gas flow through the quartz glass sheet and the porous catalyst placement platform are as Figure 7 shown.

[0069] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention, rather than indicating or implying 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 construed as a limitation to the present invention.

[0070] The embodiments described above are only descriptions of the preferred modes of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. A high-pressure gas-solid phase photothermal reaction device for a fixed bed, characterized in that: include: A reaction tube body (1), wherein a light window (11) is arranged at the top of the reaction tube body (1), a tube body is coaxially penetrated in the reaction tube body (1), the top of the tube body is closed, a gap is left between the outer wall of the tube body and the inner wall of the reaction tube body (1), the tube body is located at the bottom of the reaction tube body (1), the bottom of the reaction tube body (1) is closed, an air inlet (4) and an air outlet (7) are connected on the outer wall of the reaction tube body (1), the air outlet (7) is located at the bottom of the reaction tube body (1), the air inlet (4) is located at the top of the reaction tube body (1), and a porous catalyst placement platform is also arranged in the reaction tube body (1), the porous catalyst placement platform is located above the tube body and between the air inlet (4) and the air outlet (7), and the catalyst is arranged on the porous catalyst placement platform.

2. The high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 1, characterized in that: A third flange (8) is fixedly connected to the bottom end of the reaction tube body (1), the third flange (8) being coaxially arranged with the reaction tube body (1), a fourth flange (9) being fixedly mounted on the third flange (8), and the bottom end of the tube body being coaxially fixedly connected to the fourth flange (9).

3. The high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 1, characterized in that: The light window (11) comprises a second flange (3) coaxially fixedly connected to the top end of the reaction tube body (1), a first flange (2) being coaxially fixedly connected to the second flange (3), and a light-transmitting member (17) being arranged between the first flange (2) and the second flange (3).

4. The high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 2, characterized in that: A first convex groove (15) is fixedly connected to the bottom surface of the third flange (8) in a circumferential direction, and the first convex groove (15) is coaxially arranged with the third flange (8). A third groove (16) is opened circumferentially on the top surface of the fourth flange (9), and the third groove (16) is located on the outer side of the tube body. The third groove (16) is coaxially arranged with the fourth flange (9), and the first convex groove (15) extends into the third groove (16). An O-ring is arranged between the first convex groove (15) and the third groove (16).

5. The high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 2, characterized in that: The bottom end of the fourth flange (9) is fixedly connected to a limiting protrusion (10).

6. The high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 5, characterized in that: The limiting protrusion (10) is provided with a threaded hole, the threaded hole is coaxially arranged with the tube body, and the threaded hole is connected with the inner cavity of the tube body.

7. The high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 3, characterized in that: A first step groove (12) is circumferentially formed on the bottom surface of the first flange (2), the first step groove (12) being located at the inner edge of the first flange (2) and being coaxially arranged with the first flange (2); a second step groove (13) is circumferentially formed on the top surface of the second flange (3), the second step groove (13) being located at the inner edge of the second flange (3) and being coaxially arranged with the second flange (3); and an outer edge of the light-transmitting member (17) is located between the first step groove (12) and the second step groove (13).

8. The high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 7, characterized in that: Another O-shaped gasket is circumferentially arranged on the bottom wall of the second step groove (13), and the light-transmitting member (17) abuts against the O-shaped gasket.

9. The high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 1, characterized in that: A limiting member (14) is fixedly connected to the top end of the tube body; the limiting member (14) is located inside the reaction tube body (1); and the porous catalyst placement platform is arranged on the limiting member (14).

10. The high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 1, characterized in that: A first clamping ring (5) and a second clamping ring (6) are coaxially fixedly connected to the outer wall of the reaction tube body (1); the first clamping ring (5) and the second clamping ring (6) are respectively close to two ends of the reaction tube body (1).

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