Quartz-lined high pressure thermal catalytic reactor

Abstract

The utility model discloses a quartz lining pipe type high pressure hot catalytic reactor relates to catalytic experimental equipment technical field is equipped with the reaction tube, quartz pipe structure and thermocouple in the jar body, the quartz pipe bottom end cover of quartz pipe structure is combined and is provided with the porous sieve plate, and the inside is filled with catalyst, and the outside is fixed with the elastic buckle, the elastic buckle and the reaction tube in the limit ring airtight cooperation card setting, install and fix quartz pipe structure in the reaction tube, the measuring end of thermocouple is located below the lower end of quartz pipe. The utility model discloses the quartz pipe is set up away from the end of reaction tube, and the airtight connection between quartz pipe and reaction tube is guaranteed by the elastic buckle, and the sleeve pipe is accurately sleeved to the outside of quartz pipe without connecting the sleeve of screw sleeve, avoid the contact connection of sleeve pipe and quartz pipe when installing the threaded cooperation of connecting screw sleeve and reaction tube, and then effectively avoid the quartz pipe end to be pressed and broken, while maintaining the visual loading advantage of quartz pipe, guarantee the normal operation of experiment.

Description

Technical Field

[0001] This utility model relates to the field of catalytic experimental equipment technology, specifically to a reactor for gas-solid catalytic carbon dioxide hydrogenation reaction. Background Technology

[0002] Carbon dioxide hydrogenation catalysis is a typical catalytic reaction that can convert carbon dioxide into high-value chemicals, achieving carbon neutrality. A highly efficient catalyst is the core of the carbon dioxide hydrogenation catalytic reaction; a highly active carbon dioxide catalyst can effectively improve the carbon dioxide conversion rate in the reaction and achieve targeted selectivity of the products.

[0003] Fixed-bed reactors are a widely used type of reactor for evaluating catalyst activity in experiments. Existing fixed-bed reactors typically load the catalyst to be evaluated into a long quartz tube, which is inserted into the reaction tube and radially supported and limited by annular support rings. Connecting threaded sleeves are fitted at both ends of the reaction tube. The inner side of the outer wall of the connecting threaded sleeve has internal threads, and a cylindrical sleeve is located at the center of the inner wall. The reaction tube, with external threads at its end, is threaded into the connecting threaded sleeve, ensuring the sleeve fits snugly over the end of the long quartz tube, thus providing airtight communication between the long quartz tube and the inlet or outlet pipe. However, in actual operation, when tightening the connecting threaded sleeves at the end of the reaction tube, the sleeve may not be accurately positioned to fit over the end of the long quartz tube, leading to the quartz tube end being crushed and breaking. This not only affects the normal progress of the experiment but also unreasonably increases the cost of experimental equipment. While alternative materials such as stainless steel tubes can be used to replace long quartz tubes to address the issue of easily broken ends, these alternative materials lack the advantage of visual monitoring during the loading process. It's impossible to directly determine whether the amount of catalyst loaded meets experimental requirements by measuring the height of the loaded catalyst; instead, other methods such as weighing and calculation are needed, making the loading operation cumbersome and inefficient. Furthermore, in existing technologies, the reaction temperature measured in fixed-bed reactors is the temperature below and outside the long quartz tube, which differs significantly from the actual reaction temperature inside the catalyst bed, inevitably negatively impacting experimental accuracy. In addition, existing fixed-bed reactors employ a sequential loading mode where catalyst is loaded and used on demand, resulting in time-consuming, inefficient, and difficult-to-standardize loading procedures. Utility Model Content

[0004] This invention aims to overcome the shortcomings of the existing technology by providing a quartz-lined high-pressure thermocatalytic reactor.

[0005] The present invention adopts the following technical solution to solve the technical problem: a quartz-lined high-pressure thermocatalytic reactor, wherein the reaction tube is installed and fixed inside the tank, and its inlet and outlet extend from the top and bottom of the tank to the outside of the tank, respectively. It is also provided with a quartz tube structure and a thermocouple located inside the tank. The quartz tube structure is disposed inside the reaction tube and is located at the end away from the reaction tube, and includes a quartz tube, a porous sieve plate and an elastic buckle; The quartz tube is a circular tube structure with openings at both ends, and the bottom end is covered by the porous sieve plate. The quartz tube is filled with catalyst. An elastic buckle with a frustum-shaped structure that is larger at the top and smaller at the bottom is fixed to the outside of the quartz tube. A ring-shaped limiting ring is fixed inside the reaction tube at the installation position corresponding to the quartz tube structure. The elastic buckle is airtightly engaged with the limiting ring to install and fix the quartz tube structure inside the reaction tube. The measuring end of the thermocouple is located below the lower end of the quartz tube.

[0006] Furthermore, the quartz tube structure also includes a positioning buckle; The quartz tube is fixed with a positioning buckle and an elastic buckle, which are frustoconical structures with a larger top and a smaller bottom, respectively, from top to bottom. The positioning buckle is airtightly fitted and locked inside the reaction tube.

[0007] Furthermore, the quartz tube structure also includes a thermocouple sheath; The thermocouple sheath is installed through the center of the porous sieve plate and fixed to the porous sieve plate. Its top end extends to the middle of the axis of the quartz tube, and its bottom end extends to the lower part of the outside of the quartz tube. The measuring end of the thermocouple extends into the thermocouple sheath from the lower end of the thermocouple sheath.

[0008] Furthermore, the pore size of the sieve on the porous sieve plate is 0.6 to 0.8 times the minimum particle size of the catalyst, and the porosity is 40% to 60%.

[0009] Furthermore, the aperture of the sieve holes on the porous sieve plate increases from the center to the edge.

[0010] Furthermore, the diameter of the sieve holes at the center of the porous sieve plate is 20% to 30% smaller than the diameter of the sieve holes at the edge.

[0011] Furthermore, an upper fixing plate and a lower fixing plate are fixed inside the tank, and the reaction tube is installed and fixed inside the tank through the upper fixing plate and the lower fixing plate.

[0012] Furthermore, the elastic buckle and the positioning buckle are made of graphite.

[0013] Furthermore, the thermocouple is a type K thermocouple.

[0014] This invention provides a quartz-lined high-pressure thermocatalytic reactor, which has the following advantages: 1. The quartz tube of this utility model is positioned at the end away from the reaction tube. The airtight connection between the quartz tube and the reaction tube is ensured by an elastic buckle. The sleeve, which does not require a connecting threaded sleeve, is precisely fitted onto the outside of the quartz tube, avoiding contact between the sleeve and the quartz tube when the connecting threaded sleeve and the reaction tube are installed. This effectively prevents the end of the quartz tube from being crushed by pressure, and ensures the normal progress of the experiment while maintaining the advantage of visual loading of the quartz tube.

[0015] 2. This utility model is equipped with a thermocouple sleeve for heat conduction between the middle of the quartz tube axis and the bottom of the quartz tube. The thermocouple can accurately obtain the temperature inside the catalyst bed by measuring the temperature inside the thermocouple sleeve, realizing in-situ monitoring of the catalyst bed temperature. The temperature measurement accuracy can reach ±0.5℃, and the response time is less than 3s, which is beneficial to improving experimental accuracy and efficiency.

[0016] 3. The quartz tube structure of this utility model is convenient for catalyst loading and can be pre-loaded. The specifications and dimensions of the quartz tube can be customized according to experimental needs (it can be filled to the brim, and there is no need to measure the loading amount during loading), which further simplifies the loading process. The loaded quartz tube structure is plug-and-play, which greatly simplifies the catalyst loading operation in the experiment and helps to improve experimental efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the front half-section structure of this utility model; Figure 2 This is a partially enlarged front view half-section structural schematic diagram of the present invention; Figure 3 This is an isometric half-section diagram of the quartz tube structure of this utility model.

[0018] In the picture: 1. Tank body; 11. Upper fixing plate; 12. Lower fixing plate; 2. Reaction tube; 21. Gas inlet; 22. Gas outlet; 23. Limiting ring; 3. Quartz tube structure; 31. Quartz tube; 32. Porous sieve plate; 33. Elastic buckle; 34. Thermocouple sheath; 35. Positioning buckle; 4. Thermocouple. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] A quartz-lined high-pressure thermocatalytic reactor, such as Figures 1-3 As shown, its structural relationship is as follows: the reaction tube 2 is installed and fixed inside the tank 1, and its air inlet 21 and air outlet 22 extend from the top and bottom of the tank 1 to the outside of the tank 1, respectively. A quartz tube structure 3 and a thermocouple 4 are also provided inside the tank 1. The quartz tube structure 3 is located inside the reaction tube 2 and is positioned at the end away from the reaction tube 2. It includes a quartz tube 31, a porous sieve plate 32, and an elastic buckle 33. The quartz tube 31 is a circular tube structure with openings at both ends. A porous sieve plate 32 is installed at the bottom end. The quartz tube 31 is filled with a catalyst. An elastic buckle 33 with a frustum-shaped structure that is larger at the top and smaller at the bottom is fixed to the outside of the quartz tube 31. A ring-shaped limiting ring 23 is fixed inside the reaction tube 2 at the installation position corresponding to the quartz tube structure 3. The elastic buckle 33 is airtightly engaged with the limiting ring 23 to install and fix the quartz tube structure 3 inside the reaction tube 2. The airtight fit between the elastic buckle 33 and the limiting ring 23 prevents gas from flowing out directly without passing through the quartz tube 31 to react with the catalyst, thus ensuring sufficient reaction between the gas and the catalyst and guaranteeing the accuracy of the experimental results.

[0021] The measuring end of thermocouple 4 is located below the lower end of quartz tube 31.

[0022] Preferably, the quartz tube structure 3 also includes a positioning buckle 35; The quartz tube 31 is fixed with a positioning buckle 35 and an elastic buckle 33, which are truncated cone-shaped structures with a larger top and a smaller bottom, respectively, from top to bottom. The positioning buckle 35 is airtightly fitted into the reaction tube 2.

[0023] The radial positioning of the quartz tube structure 3 is achieved, and the circumferential movement of the quartz tube structure 3 within the reaction tube 2 is limited and guided. At the same time, the positioning buckle 35 and the airtight engagement with the reaction tube 2 further improve the airtightness of the connection between the quartz tube structure 3 and the reaction tube 2, which is conducive to improving the accuracy of the experimental results.

[0024] Preferably, the quartz tube structure 3 further includes a thermocouple sheath 34; The thermocouple sheath 34 is installed through the center of the porous sieve plate 32 and fixed to the porous sieve plate 32. Its top end extends to the middle of the axis of the quartz tube 31 and its bottom end extends to the lower part of the outside of the quartz tube 31. The measuring end of thermocouple 4 extends into thermocouple sheath 34 from the lower end of thermocouple sheath 34.

[0025] Preferably, the pore size of the sieve holes on the porous sieve plate 32 is 0.6 to 0.8 times the minimum particle size of the catalyst, and the porosity is 40% to 60%.

[0026] Preferably, the aperture of the sieve holes on the porous sieve plate 32 increases from the center to the edge.

[0027] Preferably, the aperture of the sieve holes at the center of the porous sieve plate 32 is 20% to 30% smaller than the aperture of the sieve holes at the edge.

[0028] Preferably, an upper fixing plate 11 and a lower fixing plate 12 are fixed inside the tank body 1, and the reaction tube 2 is installed and fixed inside the tank body 1 through the upper fixing plate 11 and the lower fixing plate 12.

[0029] Preferably, the elastic buckle 33 and the positioning buckle 35 are made of graphite.

[0030] Preferably, the thermocouple is a type K thermocouple, and the thermocouple is further preferably WRK-230K GH3039 φ60-1200℃.

[0031] In practical use, the following process is included: The first step is to insert the catalyst to be evaluated into the quartz tube 31 through the opening at the top of the quartz tube 31, and then seal the opening at the top of the quartz tube 31 with quartz wool.

[0032] The second step is to insert the quartz tube structure 3 into the reaction tube 2 from the upper end of the reaction tube 2, so that the quartz tube structure 3 moves down along the reaction tube 2 under the limiting and guiding action of the positioning buckle 35 until the elastic buckle 33 and the limiting ring 23 are airtightly engaged.

[0033] The third step is to insert the measuring end of thermocouple 4 into thermocouple sheath 34 from the lower end of reaction tube 2.

[0034] The fourth step is to introduce reaction gas into the reaction tube 2 through the air inlet 21 until the pressure in the reaction tube 2 reaches 3 MPa. If there is no leakage after maintaining the pressure for 10 minutes, the airtightness is considered qualified, and then proceed to the fifth step. Otherwise, if airtightness issues arise during the pressure holding process, check the airtightness of each interface by applying soapy water to identify the leak point. After the check is completed, stop the gas supply and reduce the pressure to resolve the airtightness issue at the leak point, and then proceed to step four again.

[0035] Fifth step: shut off the reaction gas supply, purge the reaction tube 2 with argon gas through inlet 21 for a period of time, then shut off the argon gas supply, and purge the reaction tube 2 with hydrogen gas through inlet 21 to activate the catalyst. Then shut off the hydrogen gas supply and purge the reaction gas into the reaction tube 2 through inlet 21 again to conduct the experiment.

[0036] Step 6: After the experiment is completed, reduce the temperature and pressure, and remove the quartz tube structure 3 from the reaction tube 2.

[0037] The filling process in the first step described above can be replaced by pre-filling.

[0038] During pre-filling, the catalyst is loaded into a custom-made quartz tube 31, sealed, and stored in a warehouse, and inventory information is established; during evaluation, the pre-filled quartz tube structure 3 can be used according to the inventory information.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A quartz-lined high-pressure thermocatalytic reactor, wherein a reaction tube (2) is installed and fixed inside a tank (1), and its inlet (21) and outlet (22) extend from the top and bottom of the tank (1) to the outside of the tank (1), respectively, characterized in that: It also includes a quartz tube structure (3) and a thermocouple (4) located inside the tank (1); The quartz tube structure (3) is located inside the reaction tube (2) and is disposed at the end away from the reaction tube (2), including a quartz tube (31), a porous sieve plate (32) and an elastic buckle (33). The quartz tube (31) has a circular tube structure with open ends, and the bottom end is covered by the porous sieve plate (32). The quartz tube (31) is filled with catalyst. The quartz tube (31) is fixed with an elastic buckle (33) with a frustum-shaped structure that is larger at the top and smaller at the bottom. A ring-shaped limiting ring (23) is fixed inside the reaction tube (2) at the installation position corresponding to the quartz tube structure (3). The elastic buckle (33) is airtightly engaged with the limiting ring (23) to install and fix the quartz tube structure (3) inside the reaction tube (2). The measuring end of the thermocouple (4) is located below the lower end of the quartz tube (31).

2. The quartz-lined high-pressure thermocatalytic reactor according to claim 1, characterized in that: The quartz tube structure (3) also includes a positioning buckle (35); The quartz tube (31) is fixed with a positioning buckle (35) and an elastic buckle (33) with a frustum-shaped structure that is larger at the top and smaller at the bottom, respectively, from top to bottom. The positioning buckle (35) is airtightly fitted into the reaction tube (2).

3. The quartz-lined high-pressure thermocatalytic reactor according to claim 1, characterized in that: The quartz tube structure (3) also includes a thermocouple sheath (34); The thermocouple sheath (34) is set through the center of the porous sieve plate (32) and is fixed to the porous sieve plate (32). Its top end extends to the middle of the axis of the quartz tube (31) and its bottom end extends to the outside and below of the quartz tube (31). The measuring end of the thermocouple (4) extends into the thermocouple sheath (34) from the lower end of the thermocouple sheath (34).

4. The quartz-lined high-pressure thermocatalytic reactor according to claim 1, characterized in that: The pore size of the porous sieve plate (32) is 0.6 to 0.8 times the minimum particle size of the catalyst, and the porosity is 40% to 60%.

5. The quartz-lined high-pressure thermocatalytic reactor according to claim 4, characterized in that: The diameter of the sieve holes on the porous sieve plate (32) increases from the center to the edge.

6. The quartz-lined high-pressure thermocatalytic reactor according to claim 5, characterized in that: The diameter of the sieve holes at the center of the porous sieve plate (32) is 20% to 30% smaller than the diameter of the sieve holes at the edge.

7. The quartz-lined high-pressure thermocatalytic reactor according to claim 1, characterized in that: The tank (1) is fixed with an upper fixing plate (11) and a lower fixing plate (12), and the reaction tube (2) is installed and fixed in the tank (1) through the upper fixing plate (11) and the lower fixing plate (12).

8. The quartz-lined high-pressure thermocatalytic reactor according to claim 2, characterized in that: The elastic buckle (33) and the positioning buckle (35) are made of graphite.

9. The quartz-lined high-pressure thermocatalytic reactor according to claim 1, characterized in that: The thermocouple is a type K thermocouple.

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