Fly ash-based porous high-flux tubular reaction device, its preparation method and application

Abstract

The present invention provides a fly ash-based porous high-flux tubular reaction device, a preparation method and application thereof, and belongs to the technical field of chemical equipment. The fly ash-based porous high-flux tubular reaction device includes at least one tube-in-tube assembly, which includes a base tube and a sleeve, the sleeve is sleeved on the outside of the base tube, a reaction chamber is formed between the inner wall of the sleeve and the outer wall of the base tube, and a porous layer formed by sintering fly ash is provided on the outer wall of the base tube. Ultrafine fly ash is sprayed on the outer surface of the base tube and sintered into a porous layer. The preparation method is simple. Since no pore-forming agent is added, the porous layer is mainly composed of micron-level pores, which is conducive to improving heat transfer efficiency and is conducive to the reaction of the medium therein. A small-scale experiment of preparing xylene by disproportionation of toluene was carried out using the above-mentioned fly ash-based porous high-flux tubular reaction device. The experimental results show that the toluene conversion rate reaches 53%-55%, the selectivity of xylene reaches 29%-30.5%, and the product yield ratio reaches 0.82-0.83.

Description

Technical Field

[0001] The present invention belongs to the technical field of chemical equipment, and particularly relates to a fly ash-based porous high-flux tubular reaction device, a preparation method thereof, and an application thereof. Background Art

[0002] A high-flux tubular heat exchanger is an efficient heat exchanger for enhancing boiling heat transfer. Its main feature is to manufacture a metal porous layer on the outer surface or inner surface of a metal smooth tube, which can achieve efficient heat transfer under a low temperature difference. The core component in a high-flux heat exchanger is a high-flux heat exchange tube. A sintered high-flux tube refers to a high-efficiency heat exchange tube with a porous surface of a specific structure sintered on the surface of an ordinary heat exchange tube by using powder metallurgy. The cavities and pores of the surface porous layer are interconnected, which can significantly enhance boiling heat transfer, and the heat transfer effect can be increased by more than 20 times. It is applicable to boiling heat transfer occasions with phase change and is widely used in engineering fields such as oil refining, petrochemical, and chemical industries. The base tube materials of high-flux heat exchange tubes mainly include copper-nickel alloy tubes, carbon steel tubes, heat-resistant steel tubes, etc. The powder usually sintered on their surfaces mainly consists of FeNi alloy or CuNi alloy.

[0003] Due to its stable properties, acid and alkali resistance, and high temperature resistance, fly ash, and at the same time, the fly ash particles with a nanometer diameter have a good pore size distribution and good strength. After appropriate processing, it can be used for the preparation of catalyst carriers, which will be more conducive to the occurrence of some chemical reactions. In the prior art, for example, the Chinese invention patent with the patent number CN202110306743.1 discloses a fly ash additive porous layer tubular reaction device and a preparation method thereof. Using fly ash and a pore-forming agent as raw materials, a porous layer structure is prepared on the inner wall of the base tube by using 3D additive printing technology, and a porous layer tubular reaction device is formed by combining with a sleeve. However, the above fly ash additive porous layer tubular reaction device has the following problems: The porous layer formed by the participation of the pore-forming agent has uneven void distribution. When the reaction medium (such as toluene) is in the tubular reaction device, the resistance is large and the flow rate is slow, resulting in a low reaction efficiency. For example, when the above fly ash additive porous layer tubular reaction device is used for the toluene disproportionation reaction to prepare xylene, the toluene conversion rate is less than 10%. Summary of the Invention

[0004] Based on this, the present invention provides a fly ash-based porous high-flux tubular reaction device to solve the technical problem of low conversion rate when the fly ash additive porous layer tubular reaction device in the prior art is used in the actual chemical reaction process.

[0005] The present invention also provides a preparation method of the above fly ash-based porous high-flux tubular reaction device.

[0006] The present invention also provides an application of the above fly ash-based porous high-flux tubular reaction device as a reaction vessel for toluene disproportionation to prepare xylene.

[0007] The technical solution of the present invention to solve the above technical problems is as follows:

[0008] A fly ash-based porous high-flux tubular reaction device includes at least one tube bundle assembly. The tube bundle assembly includes a base tube and a sleeve. The sleeve is sleeved outside the base tube, and a reaction chamber is formed between the inner wall of the sleeve and the outer wall of the base tube. A porous layer formed by sintering fly ash is provided on the outer wall of the base tube.

[0009] Preferably, the porosity of the porous layer is 80%-90%.

[0010] Preferably, the thickness of the porous layer is 0.5 mm - 3 mm.

[0011] Preferably, the outer diameter of the base tube is 3 mm - 5 mm.

[0012] Preferably, the inner diameter of the sleeve is 10 mm - 50 mm.

[0013] A preparation method of a fly ash-based porous high-flux tubular reaction device as described above includes the following steps:

[0014] a. Prepare basic materials, where the basic materials include ultrafine fly ash with a mesh size of 2000 and a sieving rate ≥ 95%;

[0015] b. Provide a base tube, and spray the basic materials on the outer wall of the base tube;

[0016] c. Microwave sintering is performed to form a porous layer on the outer wall of the base tube from the basic materials;

[0017] d. Provide a sleeve, and assemble the sleeve and the base tube with a porous layer to form the tube bundle assembly;

[0018] e. Assemble at least one tube bundle assembly to form the fly ash-based porous high-flux tubular reaction device.

[0019] Preferably, in step a, the basic materials further include α-SiC, and the mass ratio of α-SiC to the ultrafine fly ash is 1% - 5%.

[0020] Preferably, in step b, before spraying the basic materials on the outer wall of the base tube, a bonding resin is brushed on the outer wall of the base tube.

[0021] Preferably, in step b, before brushing the bonding resin on the outer wall of the base tube, the outer wall of the base tube is polished to be rough.

[0022] An application of a fly ash-based porous high-flux tubular reaction device as described above as a chemical reaction device.

[0023] Compared with the prior art, the present invention has at least the following advantages:

[0024] The present invention provides a fly ash-based porous high-flux tubular reaction device, which includes a tube bundle assembly. The tube bundle assembly includes a base tube and a sleeve tube, and a porous layer formed by sintering fly ash is provided on the outer wall of the base tube. On the one hand, setting the porous layer formed by sintering fly ash on the outer wall of the base tube simplifies the preparation process; on the other hand, the porosity distribution of the porous layer formed by sintering fly ash is uniform, which is beneficial to reducing the fluid resistance, improving the phenomenon of large pressure difference and slow flow rate of the medium in the reactor, and improving the reaction efficiency.

[0025] The present invention also provides a preparation method of the above fly ash-based porous high-flux tubular reaction device. Ultrafine fly ash is sprayed on the outer surface of the base tube and sintered into a porous layer. The production method is simple. Since no pore-forming agent is added, the porous layer is mainly composed of micron-sized pores, which is beneficial to improving the heat transfer efficiency and facilitating the reaction of the medium therein.

[0026] In the present invention, a small-scale experiment on toluene disproportionation to prepare xylene is carried out by using the above fly ash-based porous high-flux tubular reaction device. The experimental results show that the toluene conversion rate reaches 53%-55%, the selectivity to p-xylene reaches 29%-30.5%, and the product yield ratio reaches 0.82-0.83. Description of the Drawings

[0027] Figure 1 It is a schematic structural diagram of a fly ash-based porous high-flux tubular reaction device according to an embodiment.

[0028] Figure 2 It is an electron microscope scanning photograph of the porous layer.

[0029] Figure 3 It is a schematic equipment flow diagram of a fly ash-based porous high-flux tubular reaction device according to an embodiment.

[0030] Figure 4 It is a gas chromatogram of the product obtained from the experiment on toluene disproportionation to prepare xylene by using the fly ash-based porous high-flux tubular reaction device prepared by the present invention according to an embodiment.

[0031] Figure 5 It is a gas chromatogram of the product obtained from the experiment on toluene disproportionation to prepare xylene by using the fly ash-based porous high-flux tubular reaction device prepared by the present invention according to another embodiment.

[0032] Figure 6 It is a gas chromatogram of the product obtained from the experiment on toluene disproportionation to prepare xylene by using the fly ash-based porous high-flux tubular reaction device prepared by the present invention according to another embodiment.

[0033] In the figure: Tube bundle assembly 100, base tube 110, sleeve 120, reaction chamber 130, porous layer 140. Detailed implementation manners

[0034] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The following will further describe the technical solutions of the present invention in conjunction with the drawings of the embodiments of the present invention. The present invention is not limited to the following specific implementation manners.

[0035] It should be understood that the same or similar reference numerals in the drawings of the embodiments correspond to the same or similar components. In the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "front", "rear", "left", "right", "top", "bottom", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, 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. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] Please refer to Figure 1 , in a specific implementation manner of the present invention, a fly ash-based porous high-flux tubular reaction device is used for chemical reactions, especially for chemical reactions accompanied by heat release during the reaction process. For example, the fly ash-based porous high-flux tubular reaction device is used for the reaction process of toluene disproportionation to prepare xylene.

[0037] The fly ash-based porous high-flux tubular reaction device includes at least one tube bundle assembly 100. The tube bundle assembly 100 includes a base tube 110 and a sleeve 120. The sleeve 120 is sleeved outside the base tube 110. A reaction chamber 130 is formed between the inner wall of the sleeve 120 and the outer wall of the base tube 110. A porous layer 140 formed by sintering fly ash is provided on the outer wall of the base tube 110.

[0038] Preferably, the porosity of the porous layer 140 is 80%-90%. Further, in the porous layer 140, the proportion of pores with a pore size in the micron range is not less than 80%.

[0039] In some preferred implementation manners, the thickness of the porous layer 140 is 0.5 mm - 3 mm, preferably 1 mm - 3 mm, and more preferably 2 mm - 3 mm.

[0040] In some preferred embodiments, the outer diameter of the base tube 110 is 3 mm - 5 mm, preferably 4 mm - 5 mm. The inner diameter of the base tube 110 can be selected according to actual circumstances. In some embodiments, the base tube 110 is a solid tube (i.e., the inner diameter of the base tube 110 is 0), which is applicable to certain chemical reactions that do not require heat exchange. Preferably, the inner diameter of the base tube 110 is 1 mm - 4 mm to be applicable to certain chemical reactions that require heat exchange. For example, during the preparation of xylene by toluene disproportionation reaction, a heat removal medium can be introduced into the tube of the base tube 110 to improve the yield and selectivity of the toluene disproportionation reaction.

[0041] In some preferred embodiments, the inner diameter of the sleeve 120 is 10 mm - 50 mm, preferably 15 mm - 30 mm. In this way, a reaction chamber 130 with a size of 2 mm - 42 mm, preferably 5 mm - 15 mm, is formed on the surface between the sleeve 120 and the porous layer 140. During the chemical reaction process, the reaction medium flows through the reaction chamber 130 and contacts the porous layer 140 provided on the outer wall of the base tube 110, and reacts directly or under the action of a catalyst. Since the pore distribution of the porous layer 140 is mostly in the micron level and the pore distribution is uniform, the flow rate of the reaction medium is effectively guaranteed, which is beneficial to improving the conversion rate and / or selectivity.

[0042] On the one hand, setting the porous layer 140 formed by sintering fly ash on the outer wall of the base tube 110 simplifies the preparation process. On the other hand, the porous layer 140 formed by sintering fly ash has a uniform porosity distribution, which is beneficial to reducing the fluid resistance, improving the phenomenon of large pressure difference and slow flow rate of the medium in the reactor, and improving the reaction efficiency.

[0043] For example, a small-scale experiment on the preparation of xylene by toluene disproportionation using the above-mentioned fly ash-based porous high-flux tubular reaction device shows that the toluene conversion rate reaches 53% - 55%, the selectivity for p-xylene reaches 29% - 30.5%, and the product yield ratio reaches 0.82 - 0.83.

[0044] In yet another specific embodiment of the present invention, a preparation method of a fly ash-based porous high-flux tubular reaction device as described above includes the following steps:

[0045] a. Prepare basic materials, which include ultrafine fly ash with a mesh size of 2000 and a sieving rate ≥ 95%;

[0046] b. Provide a base tube 110, and spray the basic materials on the outer wall of the base tube 110;

[0047] c. Microwave sintering is carried out to form a porous layer 140 on the outer wall of the base tube 110 with the basic materials;

[0048] d. Provide the sleeve 120, assemble the sleeve 120 and the base tube 110 with the porous layer 140 to form the tube bundle assembly 100;

[0049] e. Assemble at least one of the tube bundle assemblies 100 to form the fly ash-based porous high-flux tubular reactor.

[0050] Specifically, first, ultra-fine fly ash with a sieve passing rate of ≥95% and a mesh size of 2000 is screened as the base material. The base material is sprayed onto the outer surface of the base tube 110 with an outer diameter of 5 mm prepared by a high-pressure spray gun to form a coating of about 3 mm. The base tube 110 coated with the fly ash coating is first microwave-dried at a temperature of 100°C ± 10°C for 1 h, and then microwave-sintered at a temperature of 850°C - 1000°C for 10 s - 1800 s. After cooling, the porous layer 140 is formed on the outer wall of the base tube 110. The prepared sleeve 120 with an inner diameter of 15 mm is sleeved on the outside of the base tube 110 with the porous layer 140, so that the cross-section of the sleeve 120 is concentric with that of the base tube 110, and the tube bundle assembly 100 is assembled. According to the above method, a number of the tube bundle assemblies 100 with the same structure are manufactured and assembled to form the fly ash-based porous high-flux tubular reactor.

[0051] It should be noted that, first, in the embodiment of the present invention, there is no need to additionally add a pore-forming agent (such as NaHCO 3 etc.), but the agglomeration effect of ultra-fine fly ash itself at high temperature is utilized to form spherical channels. Therefore, in the formed porous layer 140, the pore structure is mainly micron-sized pores, which is more conducive to the progress of chemical reactions.

[0052] Secondly, when the base material only contains ultra-fine fly ash, the temperature of microwave sintering needs to reach above 800°C. Preferably, the microwave sintering temperature is 850°C - 1000°C. At the same time, the time of microwave sintering needs to reach 900 s - 1800 s, otherwise the porosity of the porous layer 140 will be relatively low and cannot meet the requirements of the chemical reaction process.

[0053] In a preferred embodiment, to reduce the microwave sintering temperature and shorten the microwave sintering time, in step a, the base material further includes α-SiC, and the content of α-SiC is 1 wt% - 5 wt%. Preferably, the content of α-SiC is 1 wt% - 2 wt%. Adding a small amount of α-SiC to the base material, by virtue of the strong wave absorption property of α-SiC, local hot spots are formed in the porous layer 140, so that during the sintering process of the porous layer 140, the local temperature rises, enabling the sintering of the porous layer 140 to be completed at a lower sintering temperature and in a shorter sintering time, which is beneficial to reducing energy consumption. At the same time, due to the presence of α-SiC, the strength and wear resistance of the porous layer 140 are increased, which is beneficial to extending the service life of the fly ash-based porous high-flux tubular reactor device.

[0054] Experiments show that by adding 1% of α-SiC to the base material and sintering at a sintering temperature of 850°C - 1000°C for 15 s - 60 s, the porous layer 140 with uniform pore distribution and mainly micron-sized pores can be obtained.

[0055] In some preferred embodiments, to facilitate the formation of a uniform coating formed by the base material on the outer wall of the base tube 110, in step b, before spraying the base material on the outer wall of the base tube 110, a bonding resin is brushed on the outer wall of the base tube 110. The bonding resin is a resin with a boiling point lower than 600°C and having a certain bonding property or adsorption property. Before spraying the base material, the bonding resin is brushed on the outer wall of the base tube 110 so that the base material can adhere to the outer wall of the base tube 110. During the sintering process, the bonding resin volatilizes, which helps to form a pore structure.

[0056] Furthermore, to improve the bonding property between the porous layer 140 and the outer wall of the base tube 110, prevent the porous layer 140 from falling off during use, and extend the service life, in step b, before brushing the bonding resin on the outer wall of the base tube 110, the outer wall of the base tube 110 is polished rough. The rough surface of the polished base tube 110 is interlocked with the porous layer 140, thereby improving the bonding force between the base tube 110 and the porous layer 140.

[0057] In yet another specific embodiment of the present invention, there is an application of the fly ash-based porous high-flux tubular reactor device as described above as a chemical reaction equipment. Preferably, the above fly ash-based porous high-flux tubular reactor device is used as a reaction vessel for toluene disproportionation to prepare xylene, which is beneficial to improving the conversion rate of toluene and the selectivity of p-xylene.

[0058] The following further illustrates the technical solutions and technical effects of the present invention through specific experimental examples.

[0059] I. Preparation of the porous layer

[0060] Experimental Example 1

[0061] Prepare a steel pipe (base pipe) with an outer diameter of 5 mm, roughen the outer surface, and coat it with a layer of epoxy resin. Take ultrafine fly ash with a 95% sieve passing rate of 2000 mesh, and spray it on the outer surface of the steel pipe with a high-pressure spray gun to form a 3-mm-thick coating. The steel pipe coated with the coating is first microwave-dried at 100 °C for 60 min, and then gradually heated to 850 °C and microwave-sintered for 60 min to form the porous layer 140. The SEM image of the obtained porous layer 140 is as shown in Figure 3 shown. It can be seen that a porous layer with a uniform pore distribution is formed on the outer surface of the base pipe, and the pores are mainly micron-sized. The microstructure of the porous layer of the sintered high-flux heat exchange tube obtained in this way meets the conditions of an ideal vaporization core. Since the pores and voids in the porous layer are interconnected, the depth of the pores is ensured. At a low degree of superheat, while the bubbles absorb heat and grow in the porous layer and detach from the pores, the liquid flows into the porous layer from the connected tunnels around the pores to form a continuous enhanced heat transfer process.

[0062] Experimental Example 2

[0063] Prepare a steel pipe (base pipe) with an outer diameter of 5 mm, roughen the outer surface, and coat it with a layer of epoxy resin. Take ultrafine fly ash with a 95% sieve passing rate of 2000 mesh, and spray it on the outer surface of the steel pipe with a high-pressure spray gun to form a 3-mm-thick coating. The steel pipe coated with the coating is first microwave-dried at 100 °C for 60 min, and then gradually heated to 1000 °C and microwave-sintered for 30 min to form the porous layer 140.

[0064] Experimental Example 3

[0065] Prepare a steel pipe (base pipe) with an outer diameter of 5 mm, roughen the outer surface, and coat it with a layer of epoxy resin. Take ultrafine fly ash with a 95% sieve passing rate of 2000 mesh, and spray it on the outer surface of the steel pipe with a high-pressure spray gun to form a 3-mm-thick coating. The steel pipe coated with the coating is first microwave-dried at 100 °C for 60 min, and then gradually heated to 850 °C and microwave-sintered for 60 s to form the porous layer 140.

[0066] Table 1 shows the porosity of the porous layers obtained in Experimental Examples 1 to 3. It can be seen that porous layers with a uniform pore distribution are obtained in Experimental Examples 1 to 3, and the porosity in the porous layer is 82.3% - 84.2%. Comparing the reaction conditions of Experimental Example 3, adding α-SiC to the ultrafine fly ash can significantly shorten the sintering time and is beneficial to improving the sintering efficiency.

[0067] Table 1 Statistical results of the porous layer preparation experiments

[0068] Item Temperature / ℃ Time / min Pore distribution Porosity Experimental Example 1 850 60 Uniform 84.2％ Experimental Example 2 1000 30 Uniform 82.3％ Experimental Example 3 850 1 Uniform 83.2％

[0069] II. Preparation of Xylene by Toluene Disproportionation

[0070] Experimental Example 4

[0071] As Figure 2 , assemble in sequence according to the equipment order of preheater - vaporizer - fly ash-based porous high-flux tubular reaction device to form a reaction system, and install a thermocouple and N 2 purge pipeline. Using toluene as the raw material, after vaporization and raising to the disproportionation reaction temperature, it is introduced into the fly ash-based porous high-flux tubular reaction device for reaction. Collect the reaction products after the reaction is stable, and calculate the toluene conversion rate X r , p-xylene selectivity S p , product yield ratio X / B.

[0072] As a comparative example, replace the above fly ash-based porous high-flux tubular reaction device with a porous layer tubular reaction device prepared by the Chinese invention patent with the patent number CN202110306743.1 and a reaction vessel equipped with a zeolite molecular sieve catalyst. After the reaction is stable, collect the reaction products after the reaction is stable, and calculate the toluene conversion rate X r , p-xylene selectivity S p , product yield ratio X / B.

[0073] It was experimentally found that when using the porous layer tubular reaction device prepared by the Chinese invention patent with the patent number CN202110306743.1, due to its too small tube diameter and too large reaction pressure difference, it is basically impossible to obtain xylene products. Table 2 summarizes the experimental conditions and toluene conversion rate X r , p-xylene selectivity S p , product yield ratio X / B in Experimental Example 4. Among them, the fly ash-based porous high-flux tubular reaction device prepared in the present invention is named Reactor Type I, and the reactor equipped with zeolite molecular sieve is named Reactor Type II.

[0074] Table 2 Experimental Results of Toluene Disproportionation Reaction

[0075]

[0076]

[0077] Refer to together Figures 4 - 6, It can be seen that under the same reaction temperature, reaction pressure and liquid hourly space velocity, when toluene disproportionation reaction is carried out to prepare xylene, by using the fly ash-based porous high-flux tubular reaction device prepared by the present invention, the toluene conversion rate is 51%-55%, and compared with the reactor equipped with zeolite molecular sieve, the conversion rate is increased by 3%-4.5%. The para-xylene selectivity is 27%-30.5%, and compared with the reactor equipped with zeolite molecular sieve, the conversion rate is increased by 2%. The product yield ratio is 0.78-0.83, and compared with the reactor equipped with zeolite molecular sieve, the product yield ratio is increased by 0.4-0.8.

[0078] Obviously, the above-mentioned embodiments of the present invention are only examples for clearly explaining the present invention, rather than limiting the implementation manners of the present invention. For those of ordinary skill in the art, other different forms of changes or modifications can be made on the basis of the above description. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A fly ash-based porous high-flux tubular reaction device, comprising at least one tube bundle assembly, the tube bundle assembly including a base tube and a sleeve, the sleeve being sleeved outside the base tube, and a reaction chamber being formed between the inner wall of the sleeve and the outer wall of the base tube. Characterized in that, A porous layer formed by sintering fly ash is provided on the outer wall of the base tube, the fly ash being ultra-fine fly ash with a mesh size of 2000 meshes and a sieving rate of ≥95%, and the sintering process being free of pore-forming agents.

2. The fly ash-based porous high-flux tubular reaction device according to claim 1, Characterized in that, The porosity of the porous layer is 80%-90%.

3. The fly ash-based porous high-flux tubular reaction device according to claim 1, Characterized in that, The thickness of the porous layer is 0.5 mm - 3 mm.

4. The fly ash-based porous high-flux tubular reaction device according to claim 2, Characterized in that, The outer diameter of the base tube is 3 mm - 5 mm.

5. The fly ash-based porous high-flux tubular reaction device according to claim 1, Characterized in that, The inner diameter of the sleeve is 10 mm - 50 mm.

6. A preparation method of the fly ash-based porous high-flux tubular reaction device according to any one of claims 1-5, Characterized in that, It includes the following steps: a. Prepare basic materials, the basic materials including ultra-fine fly ash with a mesh size of 2000 meshes and a sieving rate of ≥95%; b. Provide a base tube, and spray the basic materials on the outer wall of the base tube; c. Microwave sintering to form a porous layer on the outer wall of the base tube with the basic materials; d. Provide a sleeve, and assemble the sleeve and the base tube with a porous layer to form the tube bundle assembly; e. Assemble at least one tube bundle assembly to form the fly ash-based porous high-flux tubular reaction device.

7. The preparation method of the fly ash-based porous high-flux tubular reaction device according to claim 6, Characterized in that, In step a, the basic materials further include α-SiC, and the mass ratio of α-SiC to the ultra-fine fly ash is 1%-5%.

8. The preparation method of the fly ash-based porous high-flux tubular reaction device according to claim 6, Characterized in that, In step b, before spraying the basic materials on the outer wall of the base tube, brush a bonding resin on the outer wall of the base tube.

9. The preparation method of the fly ash-based porous high-flux tubular reaction device according to claim 8, Characterized in that, In step b, before brushing the bonding resin on the outer wall of the base tube, grind the outer wall of the base tube to be rough.

10. An application of the fly ash-based porous high-flux tubular reaction device according to any one of claims 1-5 as a chemical reaction device.

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