Methane catalytic cracking hydrogen production reactor

Abstract

The utility model belongs to the technical field of methane catalytic cracking hydrogen production, and particularly relates to a reactor for methane catalytic cracking hydrogen production. The upper end of a reaction tube of the reactor is provided with a produced gas outlet, and the lower end of the reaction tube is provided with a methane inlet; the catalyst feeding hole and the catalyst outlet are respectively formed in the upper part and the lower part of the reaction tube; and a plurality of ultrasonic crusher amplitude-change poles are also arranged at the lower part of the reaction tube and are used for crushing solid carbon coated on the surface of the catalyst. The methane catalytic cracking hydrogen production reactor disclosed by the utility model can work in real time in the reaction process, a carbon layer which is deactivated and descends to the surface of a catalyst at the lower part of the reaction tube can be continuously removed, shutdown operation is not needed, the maintenance period is shortened, and the continuity and the economic benefit of industrial production are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of methane catalytic cracking hydrogen production, and particularly relates to a methane catalytic cracking hydrogen production reactor. Background Art

[0002] Methane cracking technology for hydrogen production has attracted considerable attention due to its ability to effectively reduce carbon emissions and produce high-purity hydrogen at a low cost. Methane cracking decomposes methane into hydrogen and solid carbon, producing hydrogen without CO2 emissions. However, during the cracking reaction, solid carbon deposits on the catalyst surface, significantly reducing catalyst activity and thus affecting reaction efficiency and hydrogen production.

[0003] In the existing technology, high temperature treatment, chemical cleaning or physical scraping are usually used to remove carbon deposits and restore catalyst activity. Although these methods are effective to a certain extent, they have the following problems:

[0004] High-temperature treatment: Carbon removal from catalysts under high-temperature conditions usually requires temperatures greater than 800°C, which not only consumes a lot of energy but also places high demands on reactor equipment, easily causing equipment wear and structural damage to the catalyst itself.

[0005] Chemical cleaning: Chemical agents are used to clean carbon deposits on the catalyst surface. Although this can achieve a partial removal effect, chemicals are usually corrosive and can easily damage reactor equipment. In addition, the treatment of chemical residues is complicated, which can lead to secondary pollution.

[0006] Physical scraping: Carbon deposits on the catalyst surface are removed by mechanical scraping, but this usually needs to be done during shutdown maintenance, which increases the complexity of the operation and the downtime of production, and reduces the overall economic benefits.

[0007] With the rapid growth of industrial demand for hydrogen and the stringent environmental regulations on carbon emissions, the limitations of existing technologies are becoming increasingly apparent. Therefore, a catalyst protection technology that can effectively remove carbon deposits in real time during the reaction is urgently needed to improve the efficiency of methane cracking to produce hydrogen and extend the life of the catalyst. Utility Model Content

[0008] The utility model aims to provide a methane catalytic cracking hydrogen production reactor, which can remove carbon deposits on the catalyst surface in real time by introducing ultrasonic technology into the methane cracking reactor.

[0009] In order to solve the above technical problems, the utility model provides a methane catalytic cracking hydrogen production reactor, comprising:

[0010] The reaction tube has a gas outlet at its upper end and a methane inlet at its lower end;

[0011] The catalyst feed port and the catalyst outlet are respectively arranged at the upper part and the lower part of the reaction tube; and

[0012] Several ultrasonic pulverizer horns are arranged at the lower part of the reaction tube to break up the solid carbon coated on the surface of the catalyst.

[0013] In one embodiment of the present application, the reaction tube includes a large-diameter tube and a small-diameter tube;

[0014] The upper end of the large diameter tube is provided with the gas production outlet, and the lower end is connected to the upper end of the small diameter tube;

[0015] A methane inlet is provided at the lower end of the small-diameter tube;

[0016] The catalyst feeding port is arranged on the large diameter tube;

[0017] The ultrasonic pulverizer horn and catalyst outlet are arranged on the small-diameter tube.

[0018] In one embodiment of the present application, the inner diameter ratio of the large-diameter tube to the small-diameter tube is 1.2 to 3.2.

[0019] In one embodiment of the present application, the length ratio of the large-diameter tube to the small-diameter tube is 0.15-0.8.

[0020] In one embodiment of the present application, a plurality of temperature sensors are provided on the reaction tube for detecting the temperature inside the reaction tube.

[0021] In one embodiment of the present application, a washing port is further provided at the bottom of the reaction tube.

[0022] In one embodiment of the present application, a filter is provided in the reaction tube below the catalyst outlet.

[0023] The beneficial effects of the present invention are as follows: the reaction tube of the methane catalytic cracking hydrogen production reactor is provided with a gas outlet at the upper end and a methane inlet at the lower end; the catalyst feed port and catalyst outlet are respectively provided at the upper and lower portions of the reaction tube; and the lower portion of the reaction tube is also provided with a plurality of ultrasonic pulverizer horns for breaking up solid carbon coated on the catalyst surface. The methane catalytic cracking hydrogen production reactor of the present invention can operate in real time during the reaction process, continuously removing the carbon layer on the surface of the catalyst that has deactivated and fallen to the lower portion of the reaction tube, without requiring downtime, thus reducing maintenance cycles and improving the continuity and economic benefits of industrial production.

[0024] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0025] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a schematic diagram of a preferred embodiment of the methane catalytic cracking hydrogen production reactor of the present invention.

[0028] In the picture:

[0029] Reaction tube 1, large diameter tube 11, gas production outlet 111, small diameter tube 12, methane gas inlet 121, catalyst feeding port 2, catalyst outlet 3, ultrasonic crusher horn 4, temperature sensor 5, washing port 6, filter 7. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] See also Figure 1 In one embodiment of the present application, a methane catalytic cracking hydrogen production reactor includes: a reaction tube 1, a gas production outlet 111 is provided at the upper end thereof, and a methane gas inlet 121 is provided at the lower end thereof; a catalyst feeding port 2 and a catalyst outlet 3 are respectively provided at the upper and lower parts of the reaction tube 1; and a plurality of ultrasonic crusher amplitude rods 4 are provided at the lower part of the reaction tube 1 for breaking up the solid carbon coated on the catalyst surface.

[0032] In this embodiment, as the reaction occurs, the catalyst is gradually coated by the by-product solid carbon and deactivated. During this process, the catalyst particle size and density gradually increase, and gradually settle to the lower area of the reaction tube 1. The solid carbon coated on the surface of the catalyst can be broken up by a number of ultrasonic grinder amplitude rods 4, thereby reactivating the catalyst.

[0033] Furthermore, the reaction tube 1 includes a large diameter tube 11 and a small diameter tube 12; the upper end of the large diameter tube 11 is provided with the gas production outlet 111, and the lower end is connected to the upper end of the small diameter tube 12; the lower end of the small diameter tube 12 is provided with a methane inlet 121; the catalyst feeding port 2 is provided on the large diameter tube 11; the ultrasonic crusher amplitude rod 4 and the catalyst outlet 3 are provided on the small diameter tube 12.

[0034] In this embodiment, since the diameter of the large-diameter tube 11 is larger than that of the small-diameter tube 12, when the catalyst is fluidized to the large-diameter tube 11, the diameter increases and the flow rate decreases, and the catalyst will fall back into the small-diameter tube 12. The by-product solid carbon will be carried out of the large-diameter tube 11 by the carrier gas due to its small particle size, thereby realizing the separation of the catalyst and the solid carbon.

[0035] Optionally, the inner diameter ratio of the large diameter tube 11 to the small diameter tube 12 is 1.2 to 3.2. Preferably, the inner diameter ratio of the large diameter tube 11 to the small diameter tube 12 can be 2.

[0036] Optionally, the length ratio of the large diameter tube 11 to the small diameter tube 12 is 0.15 to 0.8. Preferably, the length ratio of the large diameter tube 11 to the small diameter tube 12 can be 0.25.

[0037] In this embodiment, the reaction tube 1 is provided with a plurality of temperature sensors 5 for detecting the temperature inside the reaction tube 1. Optionally, a plurality of temperature sensors 5 may be distributed from top to bottom.

[0038] In this embodiment, optionally, a washing port 6 is further provided at the bottom of the reaction tube 1 for injecting a washing liquid or gas when the reaction tube 1 needs to be flushed.

[0039] In this embodiment, optionally, a filter screen 7 is provided in the reaction tube 1 below the catalyst outlet 3 . The filter screen 7 can prevent the catalyst from entering the methane inlet 121 .

[0040] In this embodiment, optionally, the reaction tube 1 can be a stainless steel cylinder structure with a heat-insulating material attached to the outside, and an electric heater is provided between the heat-insulating material and the reactor as a heating source.

[0041] In this embodiment, the ultrasonic pulverizer horn 4 is optionally connected to an ultrasonic pulverizer, which can convert electrical energy into mechanical vibrations, which are then amplified by the horn, so that the ultrasonic energy is more concentratedly transmitted to the material. The ultrasonic pulverizer horn 4 can be provided with multiple horns as needed.

[0042] In one application scenario, fresh catalyst is added through catalyst feed port 2, then the catalyst feed port 2 and catalyst outlet 3 are closed. The methane inlet valve is opened, and heated methane gas enters reaction tube 1 through methane inlet 121. After passing through filter screen 7, methane forms an upward airflow within reaction tube 1, fluidizing the catalyst within. A temperature sensor 5 monitors the temperature within reaction tube 1 in real time. Simultaneously, the catalyst catalyzes methane to produce hydrogen and solid carbon. As the catalytic cracking reaction proceeds, the catalyst is gradually coated with the byproduct solid carbon, deactivating it. During this process, the catalyst particle size and density gradually increase, gradually settling to the lower middle region of reaction tube 1. The ultrasonic pulverizer horn 4 emits ultrasonic waves forward and in all directions, breaking up the solid carbon coating the catalyst surface and reactivating the catalyst. As the catalyst fluidizes into the large-diameter tube 11, the increased diameter reduces the flow rate, causing it to fall back into the small-diameter tube 12. However, the byproduct solid carbon, due to its smaller particle size, is carried out of the large-diameter tube 11 by the carrier gas, thus separating the catalyst from the solid carbon. The generated hydrogen and the remaining methane by-product carbon enter the recovery section through the top gas outlet 111. After one reaction cycle, the catalyst is discharged from the catalyst outlet 3. If necessary, detergent is added through the washing port 6 to clean the reactor.

[0043] In summary, the methane catalytic cracking hydrogen production reactor of the present invention has the following advantages:

[0044] 1. Most existing technologies require shutdown or periodic maintenance to remove carbon deposits on the catalyst surface. However, the methane catalytic cracking hydrogen production reactor of the present invention can work in real time during the reaction process, continuously removing the carbon layer on the catalyst surface through ultrasound, without the need for shutdown operation, reducing maintenance cycles and improving the continuity and economic benefits of industrial production;

[0045] 2. Compared with existing high-temperature treatment methods, the methane catalytic cracking hydrogen production reactor of this utility model can remove carbon deposits at room temperature or lower temperature, significantly reducing energy consumption; in addition, it avoids damage to catalysts and equipment caused by high temperature, thereby extending the service life of the equipment;

[0046] 3. Ultrasonic technology can effectively break up and peel off carbon deposits on the catalyst surface through high-frequency vibration, preventing the carbon layer from forming a dense covering layer, ensuring the exposure and sustainable use of active sites on the catalyst surface; this physical vibration method is different from traditional mechanical scraping, avoiding mechanical damage and additional operational complexity.

[0047] 4. The ultrasonic frequency can be flexibly adjusted to cope with different catalysts or catalytic systems.

[0048] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0049] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection.

[0050] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0051] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A methane catalytic cracking hydrogen production reactor, characterized in that: include: A reaction tube (1) is provided with a gas production outlet (111) at its upper end and a methane gas inlet (121) at its lower end; A catalyst feed port (2) and a catalyst outlet (3) are respectively arranged at the upper and lower parts of the reaction tube (1); and A plurality of ultrasonic pulverizer horns (4) are arranged at the lower part of the reaction tube (1) and are used to break up the solid carbon coated on the surface of the catalyst.

2. The methane catalytic cracking hydrogen production reactor according to claim 1, characterized in that: The reaction tube (1) comprises a large-diameter tube (11) and a small-diameter tube (12); The upper end of the large-diameter tube (11) is provided with the gas production outlet (111), and the lower end is communicated with the upper end of the small-diameter tube (12); The lower end of the small-diameter tube (12) is provided with a methane inlet (121); The catalyst feeding port (2) is arranged on the large diameter tube (11); The ultrasonic pulverizer horn (4) and the catalyst outlet (3) are arranged on a small-diameter tube (12).

3. The methane catalytic cracking hydrogen production reactor according to claim 2, characterized in that: The inner diameter ratio of the large diameter tube (11) to the small diameter tube (12) is 1.2 to 3.

2.

4. The methane catalytic cracking hydrogen production reactor according to claim 2, characterized in that: The length ratio of the large diameter tube (11) to the small diameter tube (12) is 0.15 to 0.

8.

5. The methane catalytic cracking hydrogen production reactor according to claim 1, characterized in that: The reaction tube (1) is provided with a plurality of temperature sensors (5) for detecting the temperature inside the reaction tube (1).

6. The methane catalytic cracking hydrogen production reactor according to claim 1, characterized in that: The bottom of the reaction tube (1) is also provided with a washing port (6).

7. The methane catalytic cracking hydrogen production reactor according to claim 1, characterized in that: A filter screen (7) is provided in the reaction tube (1) below the catalyst outlet (3).

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