A high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed

Abstract

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. 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 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 tube 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.

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. By virtue of 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 limitations caused by microporous structures, and insufficient utilization of reaction centers in heterogeneous systems, etc.

[0003] As a typical continuous flow reaction system, the fixed bed reactor has significant advantages due to the plug flow characteristics of its gas-solid two phases 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 reactant concentration gradient 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 main body, a light window is arranged at the top of the reaction tube main body, a tube body is coaxially penetrated in the reaction tube main body, 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, the tube body is located in the lower part of the reaction tube main body, the bottom of the reaction tube main body is hermetically arranged, an air inlet and an air outlet are communicated on the outer side wall of the reaction tube main body, the air outlet is located in the lower part of the reaction tube main body, the air inlet is located in the upper part of the reaction tube main body, a porous catalyst placement platform is further arranged in the reaction tube main 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 main body, the third flange is coaxially arranged with the reaction tube main 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 main 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 a 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 a 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 a fixed bed of the present invention, a limiting member is fixedly connected to the top end of the tube 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 a fixed bed of the present invention, a first snap ring and a second snap ring are coaxially 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 a 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 tube 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 drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts:

[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 during the methanol steam reforming reaction of 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 under pure thermal and photo-thermal coupling conditions during the methanol steam reforming reaction of the reaction device of the present invention;

[0025] Figure 6 This is the comparison chart of the hydrogen production performance under pure thermal and photo-thermal coupling conditions during the methanol steam reforming reaction 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. Light transmissive 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making 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 accompanying 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 on 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 a 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, and improves the efficiency of changing the atmosphere during use. The actual use process can reach 300 °C and 3 Mpa; 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.

[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 from the light window 11 at the top of the reaction tube main body 1, and has a higher irradiation density compared with a "T"-shaped 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 fixedly connected to the top end of the reaction tube main body 1, a first flange 2 is coaxially 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 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. 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 at the same time 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 protrusion 10 is fixedly connected to the bottom end of the fourth flange 9.

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

[0044] In a feasible solution, a threaded hole is formed in the limiting protrusion 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 protrusion 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 tube 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 inner edge 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 tube 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] Mix Al2O3 and calcium aluminate cement according to a mass ratio of 7:3, and ball-mill and dry-mix them 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 it for 1 h, then place it in an oven at 110 °C to dry to a constant weight, and finally pass it 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 them 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 and form it under a pressure of 35 Mpa. After demolding, let it air-dry naturally for 24 h, then place it in an oven at 110 °C to dry 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 respectively. The catalyst is the same catalyst, the flow rate of the carrier gas (N2) is 30 ml / min, the flow rate of methanol-water (molar ratio 1:1) is 0.05 ml / min, and 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, and 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, 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: The photothermal methanol steam reforming reaction is carried out using the reaction device of the present invention. In this example, the catalyst is the same as that in the second specific example. The flow rate of the carrier gas (N2) 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 pure thermal and photothermal coupling reaction conditions is as Figure 5 shown. The hydrogen production under photothermal coupling reaction conditions is significantly more than that under 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 a 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 its rich pore structure, the porous catalyst placement platform can enable the gas flow to 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. is based on the orientation or positional relationship shown in the drawings, and is 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 thus cannot be construed as a limitation of the present invention.

[0070] The above-described embodiments are only descriptions of the preferred embodiments 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 resistant gas-solid phase photothermal reaction device for a fixed bed, characterized in that, Comprising: A reaction tube body (1), at the top of the reaction tube body (1) there is a light window (11), coaxially penetrating through the reaction tube body (1) is a tube body, the top of the tube body is hermetically arranged, there is a gap between the outer side wall of the tube body and the inner side wall of the reaction tube body (1), the tube body is located in the lower part of the reaction tube body (1), the bottom of the reaction tube body (1) is hermetically arranged, on the outer side wall of the reaction tube body (1) there are communicated an air inlet (4) and an air outlet (7), the air outlet (7) is located in the lower part of the reaction tube body (1), the air inlet (4) is located in the upper part of the reaction tube body (1), inside the reaction tube body (1) there is also provided a porous catalyst placement platform, the porous catalyst placement platform is located above the tube body and between the air inlet (4) and the air outlet (7), and a catalyst is arranged on the porous catalyst placement platform; The light window (11) includes a second flange (3) coaxially fixed to the top of the reaction tube body (1), coaxially fixed to the second flange (3) is a first flange (2), and between the first flange (2) and the second flange (3) there is a light transmissive member (17); At the bottom of the reaction tube body (1) there is fixed a third flange (8), the third flange (8) is coaxially arranged with the reaction tube body (1), on the third flange (8) there is fixedly installed a fourth flange (9), and the bottom of the tube body is coaxially fixed to the fourth flange (9); On the bottom surface of the third flange (8) there is circumferentially fixed a first convex groove (15), the first convex groove (15) is coaxially arranged with the third flange (8), on the top surface of the fourth flange (9) there is circumferentially opened a third groove (16), the third groove (16) is located outside the tube body, the third groove (16) is coaxially arranged with the fourth flange (9), the first convex groove (15) extends into the third groove (16), and between the first convex groove (15) and the third groove (16) there is an O-ring; On the bottom surface of the first flange (2) there is circumferentially opened a first step groove (12), the first step groove (12) is located at the inner edge of the first flange (2) and is coaxially arranged with the first flange (2), on the top surface of the second flange (3) there is circumferentially opened a second step groove (13), the second step groove (13) is located at the inner edge of the second flange (3) and is coaxially arranged with the second flange (3), and the outer edge of the light transmissive member (17) is located between the first step groove (12) and the second step groove (13).

2. The high-pressure-resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 1, wherein: At the bottom of the fourth flange (9) there is fixed a limit projection (10).

3. A high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed, characterized in that: On the limit projection (10) there is opened a threaded hole, the threaded hole is coaxially arranged with the tube body, and the threaded hole communicates with the inner cavity of the tube body.

4. The high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed according to claim 1, characterized in that: On the bottom wall of the second step groove (13) there is circumferentially arranged another O-ring, and the light transmissive member (17) abuts against the O-ring.

5. A high-pressure resistant gas-solid phase photothermal reaction device for a fixed bed, 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 main body (1), and the porous catalyst placement platform is arranged on the limiting member (14).

6. 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 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).

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