Carbon dioxide high-temperature hydrogenation catalyst evaluation device

Abstract

The utility model provides a carbon dioxide high-temperature hydrogenation catalyst evaluation device, which relates to the technical field of catalyst evaluation and comprises a rack, an electric furnace and a quartz tube are mounted on one side of the rack, a protective cover is arranged on the outer side of the quartz tube, an observation port is arranged on the protective cover and the electric furnace close to the middle, and the electric furnace is positioned on the outer side of the protective cover. A protection auxiliary assembly is installed on the outer side of the observation opening. The outer side of the quartz tube is sleeved with the stainless steel protective cover, extra support and protection are provided for the quartz tube, pressure borne by the quartz tube is reduced, and therefore the risk of breakage or damage of the quartz tube is reduced, the stainless steel protective cover not only has the compression resistance function, but also enhances the structural stability and safety of the whole device, and the service life of the device is prolonged. The protective cover can disperse and bear the pressure from the external environment, it is ensured that no accident happens in the normal operation process of the device, meanwhile, observation openings are formed in the protective cover and the electric furnace, the reaction condition in the quartz tube can be observed conveniently, and photo-thermal reaction can be conducted conveniently.

Description

Technical Field

[0001] The utility model relates to the technical field of catalyst evaluation, in particular to a device for evaluating a carbon dioxide high-temperature hydrogenation catalyst. Background Art

[0002] The current carbon dioxide recovery and utilization technologies include pressure swing adsorption, membrane separation, absorption and catalytic conversion. Among them, carbon dioxide catalytic hydrogenation is of particular importance. Carbon dioxide can react with hydrogen to produce low-carbon compounds such as methane, methanol, methyl ether, formic acid and its derivatives.

[0003] The catalytic hydrogenation of carbon dioxide needs to be reacted through a carbon dioxide hydrogenation catalyst evaluation device. After searching, the Chinese patent application number: CN202023345805.X discloses a carbon dioxide hydrogenation catalyst evaluation device, including a frame, a gas mixer and a reactor are arranged in the frame, a feed pipe is connected to the gas mixer, the feed pipe is connected to a filter, the gas mixer is connected to the reactor, a discharge pipe is arranged at the bottom of the reactor, and a back pressure valve is arranged on the discharge pipe. The structural design of the utility model is ingenious and reasonable, and the practicality is strong. The gas must be filtered by the filter before it is transported to the gas mixer to remove impurities in the gas, improve the quality of the raw gas, and thus improve the reaction quality. At the same time, a back pressure valve is arranged on the discharge pipe of the reactor, and the system pressure of the entire device is stabilized by the back pressure valve to improve the overall operation safety performance.

[0004] As can be seen from the above, the carbon dioxide high temperature hydrogenation catalyst evaluation device in the prior art mainly focuses on reducing impurities in the gas, while using a back pressure valve to stabilize the system pressure of the entire device. However, the carbon dioxide high temperature hydrogenation catalyst evaluation device in the prior art usually places an electric furnace directly on the outside of the quartz tube when in use. After being heated by the electric furnace, the quartz tube needs to withstand high temperatures. Due to the thermal expansion effect, there may be a pressure difference between the inside and outside of the quartz tube. This thermal pressure may cause the quartz tube to deform or rupture. In addition, if there is no protective cover outside the quartz tube, it is easy to cause local overheating or uneven temperature of the quartz tube, reducing the accuracy of the reaction data.

[0005] Therefore, there are areas for improvement. In view of this, a device for evaluating a carbon dioxide high-temperature hydrogenation catalyst is provided. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of the present application is to propose a carbon dioxide high-temperature hydrogenation catalyst evaluation device, the specific scheme is as follows: it includes a frame, an electric furnace and a quartz tube are installed on one side of the frame, a protective cover is arranged on the outside of the quartz tube, observation ports are opened near the middle of the protective cover and the electric furnace, the electric furnace is located on the outside of the protective cover, and a protective auxiliary component is installed on the outside of the observation port.

[0007] Preferably, a catalyst layer is placed inside the quartz tube, and quartz wool is provided at both upper and lower ends of the catalyst layer.

[0008] Preferably, the position of the catalyst layer corresponds to the position of the observation port.

[0009] Preferably, the protective auxiliary component includes a pair of first sliding blocks, the first sliding blocks are respectively slidably connected to sliding rails arranged on both sides of the observation port, and a sealing plate is arranged between the pair of first sliding blocks.

[0010] Preferably, two second sliding blocks are slidably disposed at the lower ends of the two slide rails, respectively, and a rectangular plate is disposed between the two second sliding blocks.

[0011] Preferably, through grooves are provided on both upper and lower sides of the rectangular plate, and a transparent plate is slidably arranged in the through grooves.

[0012] Preferably, symmetrical connecting rods are arranged on the upper side of the transparent plate, and the upper ends of the two connecting rods are connected by a transverse plate.

[0013] Preferably, the transverse plate is fixed to the upper side of the sealing plate by a first latch.

[0014] Preferably, the transparent plate is fixed in the rectangular plate by a second latch.

[0015] Preferably, a symmetrical limiting block is provided on the lower side of the sealing plate, and the connecting rod is slidably provided in the limiting block.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) By installing a stainless steel protective cover on the outside of the quartz tube, the quartz tube is provided with additional support and protection, the pressure on the quartz tube is reduced, and the risk of its rupture or damage is reduced. The stainless steel protective cover not only provides pressure resistance, but also enhances the structural stability and safety of the entire device. The protective cover can disperse and withstand the pressure from the external environment to ensure that no accidents will occur during the normal operation of the device. The stainless steel tube protective cover can assist the electric furnace to heat the quartz tube more evenly, avoiding local overheating or uneven temperature of the quartz tube, thereby ensuring the stability of the reaction and the accuracy of the reaction data. At the same time, observation ports are opened on the protective cover and the electric furnace to facilitate the observation of the catalyst reaction inside the quartz tube and also facilitate photothermal reaction.

[0018] (2) The observation port is sealed by a sealing plate, thereby strengthening the protection of the quartz tube by the protective cover. When the sealing plate slides, the rectangular plate and the transparent plate are moved to the observation port, which not only does not affect the use of the observation port, but also has a certain pressure resistance effect.

[0019] (3) The transparent plate slides inside the rectangular plate, which facilitates the removal of the transparent plate and makes it easier to replace the transparent plate when it is damaged.

[0020] (4) By setting up an observation port, it is convenient to observe the changes in the physical and chemical properties of the catalyst during the reaction while carrying out the thermal catalytic reaction, and to carry out the photothermal catalytic reaction, thereby transforming the traditional fossil energy into the green economic solar energy. This not only reduces the emission of greenhouse gases and saves costs, but also meets the current requirements of sustainable development. It is also more conducive to comparing the effects of the activation energy of photothermal catalysis and the activation energy of thermal catalysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model;

[0022] Figure 2 This is a schematic diagram of the internal structure of an electric furnace according to an embodiment of the utility model;

[0023] Figure 3 It is a schematic cross-sectional view of the protective cover structure of an embodiment of the utility model;

[0024] Figure 4 This is a schematic diagram of the structure of the protective auxiliary component of an embodiment of the utility model;

[0025] Figure 5 This is a schematic diagram of the transparent plate structure of an embodiment of the utility model.

[0026] Figure numerals: 1. frame; 2. quartz tube; 3. electric furnace; 4. protective cover; 41. observation port; 42. slide rail; 5. quartz wool; 6. catalyst layer; 7. protective auxiliary component; 71. first slider; 72. sealing plate; 73. first latch; 74. limit block; 75. second slider; 76. rectangular plate; 77. transparent plate; 78. connecting rod; 79. second latch. DETAILED DESCRIPTION

[0027] The present invention will be further described in detail below in conjunction with the embodiments and drawings, but the implementation methods of the present invention are not limited thereto.

[0028] The carbon dioxide high-temperature hydrogenation catalyst evaluation device in the prior art mainly focuses on reducing impurities in the gas, and uses a back-pressure valve to stabilize the system pressure of the entire device. However, the carbon dioxide high-temperature hydrogenation catalyst evaluation device in the prior art usually places an electric furnace directly on the outside of the quartz tube when in use. After being heated by the electric furnace, the quartz tube needs to withstand high temperatures. Due to the thermal expansion effect, a pressure difference may occur between the inside and outside of the quartz tube. This thermal pressure may cause the quartz tube to deform or rupture. Secondly, when heated by the electric furnace, the quartz tube is prone to local overheating or uneven temperature, thereby ensuring the stability of the reaction and the accuracy of the reaction data. In order to solve the above problems, the following solution is proposed.

[0029] For details, please refer to Figures 1 to 5 As shown, it includes a frame 1, an electric furnace 3 and a quartz tube 2 are installed on one side of the frame 1, the electric furnace 3 is used for heating, a protective cover 4 is arranged on the outside of the quartz tube 2, the protective cover 4 is made of stainless steel, stainless steel is a corrosion-resistant alloy steel, and can resist chemical corrosion and oxidation in a variety of environments, an observation port 41 is provided near the middle of the protective cover 4 and the electric furnace 3, the observation port 41 is convenient for the experimenter to observe the reaction situation inside the quartz tube 2, and is convenient for photothermal reaction, and the electric furnace 3 is located on the outside of the protective cover 4.

[0030] The inner diameter of the quartz tube 2 is 6 mm and the length is 68.5 mm, wherein the upper section of the quartz tube 2 is 37.5 mm long and the lower section is 31 mm long, with a quartz sand core in the middle. A catalyst layer 6 is placed on the inner quartz sand core of the quartz tube 2, and a layer of quartz wool 5 is placed at the upper and lower ends of the catalyst layer 6. Before starting the reaction, the catalyst needs to be pretreated under normal pressure and high-purity N2. Then, the mixed raw gas (H2 and CO2 mixed gas) is passed into the fixed bed reactor until the reactor pressure reaches 3 MPa, maintaining a certain air velocity, and the temperature range of the catalyst activity evaluation is 200°C to 450°C. All products are detected online in real time by a gas chromatograph (Agilent7890B), and data at each temperature point is collected and the product components are analyzed. The pipe between the outlet of the fixed bed reactor and the inlet of the gas chromatograph is wrapped with a heating belt with a temperature of 120°C to avoid methanol condensation.

[0031] like Figure 3 As shown, the position of the catalyst layer 6 corresponds to the position of the observation port 41, which is convenient for experimenters to conduct photothermal reactions and observe changes in the physical and chemical properties of the catalyst. The electric furnace 3 is fixed by a pair of locks, one side of which is provided with a handle to facilitate the opening of the electric furnace 3, so that the electric furnace 3 does not affect the use of the observation port 41.

[0032] Furthermore, a protective auxiliary component 7 is installed on the outer side of the observation port 41, and the protective auxiliary component 7 includes a pair of first sliders 71, and the first sliders 71 are slidably connected to the slide rails 42 set on both sides of the observation port 41, and a sealing plate 72 is set between the pair of first sliders 71. The sealing plate 72 seals the observation port 41 when it is not in use, thereby enhancing the pressure resistance of the protective cover 4.

[0033] In addition, two second sliding blocks 75 are slidably set at the lower ends of the two slide rails 42, and a rectangular plate 76 is set between the two second sliding blocks 75. Through grooves are provided on the upper and lower sides of the rectangular plate 76, and a transparent plate 77 is slidably set in the through groove. The transparent plate 77 can be made of transparent quartz glass. When the observation port 41 is used, the sealing plate 72 is moved upward, and the rectangular plate 76 moves with the transparent plate 77 to the observation port 41 to block the observation port 41, thereby isolating the quartz tube 2 in the protective cover 4, thereby improving safety, making the originally opaque 72 become transparent 77, and increasing visibility while maintaining the original stability.

[0034] Therefore, in order to prompt the rectangular plate 76 to move together when the sealing plate 72 moves, symmetrical connecting rods 78 are set on the upper side of the transparent plate 77, and the upper ends of the two connecting rods 78 are connected by a cross plate, and the cross plate is fixed to the upper side of the sealing plate 72 by a first latch 73, thereby improving the stability of the transparent plate 77. Furthermore, the transparent plate 77 is fixed in the rectangular plate 76 by a second latch 79, so that the sealing plate 72 moves with the transparent plate 77. At the same time, after removing the first latch 73 and the second latch 79, it is convenient to disassemble the transparent plate 77.

[0035] At the same time, a symmetrical limit block 74 is provided on the lower side of the sealing plate 72 , and the connecting rod 78 is slidably provided in the limit block 74 , so as to increase the sliding stability of the connecting rod 78 .

[0036] The specific working principle of a carbon dioxide high temperature hydrogenation catalyst evaluation device: when using the observation port 41, open the electric furnace 3, slide the sealing plate 72 upward, and move the sealing plate 72 upward with the rectangular plate 76 and the transparent plate 77, and then when the transparent plate 77 moves to the observation port 41, the reaction situation inside the quartz tube 2 can be observed through the observation port 41 or a photothermal catalytic reaction can be performed, and the protective cover 4 is set on the outside of the quartz tube 2 to improve the pressure resistance of the quartz tube 2. Prevent the quartz tube 2 from deformation or rupture.

[0037] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A carbon dioxide high temperature hydrogenation catalyst evaluation device, characterized in that: The invention comprises a frame (1), an electric furnace (3) and a quartz tube (2) are mounted on one side of the frame (1), a protective cover (4) is arranged on the outside of the quartz tube (2), an observation port (41) is provided near the middle of the protective cover (4) and the electric furnace (3), the electric furnace (3) is located on the outside of the protective cover (4), and a protective auxiliary component (7) is mounted on the outside of the observation port (41).

2. The carbon dioxide high temperature hydrogenation catalyst evaluation device according to claim 1, characterized in that: A catalyst layer (6) is placed inside the quartz tube (2), and quartz wool (5) is arranged at both the upper and lower ends of the catalyst layer (6).

3. The carbon dioxide high temperature hydrogenation catalyst evaluation device according to claim 2, characterized in that: The position of the catalyst layer (6) corresponds to the position of the observation port (41).

4. The carbon dioxide high temperature hydrogenation catalyst evaluation device according to claim 1, characterized in that: The protective auxiliary component (7) comprises a pair of first sliding blocks (71), wherein the first sliding blocks (71) are respectively slidably connected to sliding rails (42) arranged on both sides of the observation port (41), and a sealing plate (72) is arranged between the pair of first sliding blocks (71).

5. The carbon dioxide high temperature hydrogenation catalyst evaluation device according to claim 4, characterized in that: Two second sliding blocks (75) are slidably arranged at the lower ends of the two sliding rails (42), and a rectangular plate (76) is arranged between the two second sliding blocks (75).

6. The carbon dioxide high temperature hydrogenation catalyst evaluation device according to claim 5, characterized in that: The rectangular plate (76) has through grooves on both the upper and lower sides, and a transparent plate (77) is slidably arranged in the through grooves.

7. The carbon dioxide high temperature hydrogenation catalyst evaluation device according to claim 6, characterized in that: Symmetrical connecting rods (78) are arranged on the upper side of the transparent plate (77), and the upper ends of the two connecting rods (78) are connected by a transverse plate.

8. The carbon dioxide high temperature hydrogenation catalyst evaluation device according to claim 7, characterized in that: The transverse plate is fixed to the upper side of the sealing plate (72) via a first latch (73).

9. The carbon dioxide high temperature hydrogenation catalyst evaluation device according to claim 8, characterized in that: The transparent plate (77) is fixed in the rectangular plate (76) via a second latch (79).

10. The carbon dioxide high temperature hydrogenation catalyst evaluation device according to claim 9, characterized in that: A symmetrical limiting block (74) is arranged on the lower side of the sealing plate (72), and the connecting rod (78) is slidably arranged in the limiting block (74).

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