In-situ crystallization catalyst and production line and preparation method thereof

Abstract

The invention relates to an in-situ crystallization catalyst and a production line and a preparation method thereof, the production line comprises a spraying box and a drying box, a plurality of spraying modules are arranged at the top of the spraying box, and each spraying module comprises a spraying disc; the first nozzle is arranged in the center of the spraying disc and conveys assistant slurry at high pressure; the multiple second nozzles are located at the edge of the spraying disc, kaolin slurry is conveyed into the second nozzles at high pressure, and the spraying directions of the second nozzles obliquely point to the optimal spraying diffusion layer of the first nozzle; the first annular electrode and the insulating ring are arranged at a mist outlet nozzle of the second nozzle, and the spring electrode and the insulating sleeve are arranged at a mist outlet nozzle of the first nozzle; and the electrostatic generator is used for outputting high-voltage charges with different polarities to the first annular electrode and the spring electrode respectively. According to the invention, charges with opposite polarities are applied to the assistant fogdrops and the kaolin fogdrops, so that the mixing efficiency and uniformity of the assistant fogdrops and the kaolin fogdrops can be improved under the condition of ensuring the mixing ratio of the two fogdrops.

Description

Technical Field

[0001] The present application relates to the technical field of industrial catalysis, and in particular to an in-situ crystallization catalyst and a production line and a preparation method thereof. Background Art

[0002] In-situ crystallization catalyst is a catalyst prepared by in-situ crystallization technology, in which the active components of the catalyst are directly crystallized and grown on a specific carrier material under controlled conditions to form a catalyst with a specific crystal structure and catalytic function. The characteristic of this catalyst is that the active components are tightly bound to the carrier, which can improve the stability and catalytic efficiency of the catalyst.

[0003] In the related art, a Chinese patent with application number CN202111502789.7 proposes a heavy oil-type in-situ crystallization catalyst. The kaolin microsphere raw material for preparing the catalyst contains a silicon-aluminum material, and the silicon-aluminum material has a pseudo-boehmite structure. Its anhydrous chemical expression is calculated by oxide weight: (0-0.2) Na2O: (4-30) SiO2: (70-96) Al2O3, which has a double pore distribution of 2-40n in-situ crystallization catalyst production line and 70-300n in-situ crystallization catalyst production line, a specific surface area greater than 500 and not more than 650 in-situ crystallization catalyst production line 2 / g, a pore volume of 2.1-2.8 in-situ crystallization catalyst production line l / g, and a ratio of pyridine infrared B acid amount to L acid amount measured at 200°C of 0.10-0.38. The preparation method is as follows: (1) preparing an in-situ crystallization product from kaolin microspheres; using kaolin as a raw material, adding deionized water and silicon-aluminum materials, spray drying the prepared mixed slurry to obtain kaolin spray microspheres, and then calcining, mixing with a silicon source, an alkaline solution, and a directing agent for crystallization, filtering, washing, and drying the filter cake to obtain an in-situ crystallization product; the amount of silicon-aluminum materials added is 1 to 10% of the mass of kaolin, preferably 2 to 8%; (2) the in-situ crystallization product is exchanged and calcined to prepare an in-situ crystallization catalyst; the in-situ crystallization product is exchanged and calcined with one or more of ammonium salts, rare earths, or phosphorus to obtain an in-situ crystallization catalyst.

[0004] Among them, when preparing kaolin spray microspheres, additives are generally added to the kaolin slurry, such as structural additives mainly composed of starch, graphite powder or carboxymethyl cellulose, which can improve the pore structure of the kaolin spray microspheres after drying and forming; or binders mainly composed of sodium silicate, silica sol, aluminum sol, pseudo-boehmite, etc., and the amount of these additives added is generally about 10% to 25% of the mass of kaolin. However, in the current preparation process, these raw materials are usually directly mixed to prepare the slurry, and the kaolin particle size selected is 2.5 to 3.5μ in-situ crystallization catalyst production line, which requires a long time to mix so that the additives in the kaolin slurry can achieve the purpose of sufficient mixing; and due to the addition of the adhesive, the efficiency of this uniform mixing is further reduced. Summary of the invention

[0005] In order to improve the problem of low uniform mixing efficiency of kaolin and additives in kaolin slurry, the present application provides an in-situ crystallization catalyst and a production line and preparation method thereof.

[0006] The first aspect of the present application provides an in-situ crystallization catalyst production line adopting the following technical solution: An in-situ crystallization catalyst production line includes a microsphere spray device and a drying box. The microsphere spray device includes a spray box connected to the drying box. A plurality of spray modules are arranged on the top of the spray box. The spray modules include: A spray plate, mounted on the top of the spray box; A first nozzle is disposed at the center of the spray disc and is connected to a first slurry pipe, wherein the first slurry pipe carries an auxiliary agent slurry at high pressure; A second nozzle is provided in plurality and is located at the edge of the spray disk, wherein the plurality of second nozzles are distributed in an equally spaced circular array about the central axis of the spray disk, the second nozzle is connected to a second slurry pipe, in which kaolin slurry is transported at high pressure, and the spray direction of the second nozzle is obliquely directed toward the optimal spray diffusion layer of the first nozzle; The first annular electrode and the insulating ring are arranged at the mist outlet of the second nozzle, A spring electrode, with an insulating sleeve disposed at the mist outlet of the first nozzle; and The electrostatic generator is used to output high voltage charges of different polarities to the first annular electrode and the spring electrode respectively.

[0007] Furthermore, the spring electrode is configured as a conical helical spring, and its minimum inner diameter end is larger than the outer diameter of the first nozzle, and its maximum inner diameter is smaller than the diffusion diameter of the first nozzle at its optimal spray diffusion layer.

[0008] Furthermore, the axial length of the spring electrode is smaller than the distance between the first nozzle mist outlet and its optimal spray diffusion layer.

[0009] Furthermore, the spray basin is provided with a vibration unit for applying a vibration frequency close to the resonance frequency of the spring electrode to the spring electrode.

[0010] Furthermore, the spray box is provided with a second annular electrode corresponding to the optimal spray diffusion layer of the first nozzle, the inner diameter of the second annular electrode is larger than the outer diameter of the spray disk, the second annular electrode is connected to the electrostatic generator and the electrostatic generator outputs a high-voltage charge with the same polarity as the high-voltage charge on the first annular electrode.

[0011] Furthermore, a spray diffusion angle of the second nozzle is smaller than a spray diffusion angle of the first nozzle.

[0012] Furthermore, the first annular electrode is in a cone shape, and its closing end is close to the second nozzle.

[0013] Furthermore, the joint between the spray box and the drying box is provided with an air guide cone cover with a closed end extending into the drying box.

[0014] The second aspect of the present application provides an in-situ crystallization catalyst preparation method using the following technical solution: A method for preparing an in-situ crystallization catalyst, based on the above-mentioned in-situ crystallization catalyst production line, comprises the following steps: S1. The kaolin and deionized water are mixed to form a kaolin slurry, and the additive is mixed with deionized water in a ratio to form an additive slurry; S2. passing the kaolin slurry into the plurality of second nozzles at high pressure, passing the auxiliary agent slurry into the first nozzle at high pressure, controlling the spray flow rate ratio of the plurality of second nozzles and the first nozzle according to the ratio of kaolin to the auxiliary agent, preparing kaolin spray microspheres in the spray box, drying them in the drying box, calcining them, mixing them with a silicon source, an alkaline solution, and a directing agent for crystallization, filtering, washing, and drying the filter cake to obtain an in-situ crystallization product; S3. exchanging and calcining the in-situ crystallization product with one or more of ammonium salt, rare earth or phosphorus to obtain an in-situ crystallization catalyst.

[0015] The third aspect of the present application provides an in-situ crystallization catalyst using the following technical solution: An in-situ crystallization catalyst is prepared by the above-mentioned in-situ crystallization catalyst preparation method.

[0016] In summary, the beneficial technical effects of this application are: 1. When preparing kaolin spray microspheres, kaolin and deionized water are first uniformly mixed into kaolin slurry, and then various additives with set ratios are mixed with deionized water into additive slurry, and the kaolin slurry is passed into multiple second slurry pipes at high pressure, and the additive slurry is passed into the first slurry pipe at high pressure, and the flow rates of the spray droplets from the first nozzle and the second nozzle are controlled by the first flow solenoid valve and the second flow solenoid valve, so that when the first nozzle sprays the additive slurry, the multiple second nozzles arranged around it also spray the kaolin slurry, and efficient mixing can be performed while ensuring the ratio of the additive slurry and the kaolin slurry; 2. When the electrostatic generator is working, it outputs high-voltage positive charge to the first annular electrode and high-voltage negative charge to the spring electrode, so that the additive droplets sprayed from the first nozzle are negatively charged, and the kaolin droplets sprayed from the second nozzle are positively charged. In this way, the additive droplets and the kaolin droplets can be mixed under the mutual attraction of their own positive and negative charges. Compared with conventional stirring and mixing, this method can greatly promote the mixing efficiency of kaolin and additives; and because the two are mixed in the form of droplets, the mixing uniformity of the two can be greatly promoted; 3. By setting the spring electrode as a conical coil spring so that its cone shape is close to the diffusion model of the additive droplets sprayed from the first nozzle, the spring electrode can charge the additive droplets more evenly; at the same time, the spring electrode is subjected to high-frequency vibration with the help of a vibration unit, so that the spring electrode can not only charge the additive droplets, but also further add oblique kinetic energy to the additive droplets, improve the uniformity of the additive droplets, and make the additive droplets have sufficient kinetic energy to diffuse to the surrounding side, so as to further promote the capture and combination of the additive droplets and the kaolin droplets on the surrounding side. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a cross-sectional view of the overall structure of an embodiment of the present application; Figure 2 yes Figure 1 A partial enlarged schematic diagram of part A.

[0018] Description of reference numerals: 1. Drying oven; 2. Spray box; 3. Spray disc; 311. First nozzle; 312. First slurry pipe; 321. Second nozzle; 322. Second slurry pipe; 41. a first annular electrode; 42. a second annular electrode; 51. Spring electrode; 52. Vibration unit; 6. Electrostatic generator; 7. Air guide cone cover; 81. A first flow solenoid valve; 82. A second flow solenoid valve; 9. Insulated wall. DETAILED DESCRIPTION

[0019] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0020] The present application embodiment discloses an in-situ crystallization catalyst production line. Figure 1 and Figure 2 , which includes a microsphere spray device and a drying box 1, the microsphere spray device includes a spray box 2 connected to the drying box 1, and a plurality of spray modules are arranged on the top of the spray box 2, and the spray modules include: A spray plate 3 is installed on the top of the spray box 2; The first nozzle 311 is disposed at the center of the spray disc 3 and is connected to a first slurry pipe 312. The first slurry pipe 312 transports the auxiliary agent slurry at high pressure. The first slurry pipe 312 is connected to a first flow electromagnetic valve 81. There are multiple second nozzles 321 located at the edge of the lower end surface of the spray disk 3. The multiple second nozzles 321 are distributed in an equally spaced circular array around the central axis of the spray disk 3. The second nozzle 321 is connected to a second slurry pipe 322. Kaolin slurry is transported at high pressure in the second slurry pipe 322. The second slurry pipe 322 is connected to a second flow solenoid valve 82. The spray direction of the second nozzle 321 is obliquely directed to the optimal spray diffusion layer of the first nozzle 311, and the droplets sprayed by the multiple second nozzles 321 just completely surround and cover the droplets sprayed by the first nozzle 311 at the optimal spray diffusion layer. Moreover, in the specific configuration, the ratio of the number of second nozzles 321 to the number of first nozzles 311 can be the ratio of the weight proportions of kaolin to the additive; alternatively, the additive slurry flow rate and the total kaolin slurry flow rate are respectively controlled by the first flow solenoid valve 81 and the second flow solenoid valve 82, so that the weight proportions of the additive and the weight proportions of kaolin sprayed simultaneously by the first nozzle 311 and multiple second nozzles 321 reach a set ratio to ensure that the ratio of the two meets the requirements.

[0021] The first annular electrode 41 and the insulating ring are arranged at the mist outlet of the second nozzle 321. The spring electrode 51 is insulated and sleeved at the mist outlet of the first nozzle 311, wherein the first nozzle 311 and the second nozzle 321 are both grounded; and The electrostatic generator 6 is used to output high-voltage charges of different polarities to the first annular electrode 41 and the spring electrode 51, respectively. For example, in a specific example, the first annular electrode 41 is supplied with a high-voltage positive charge, and the spring electrode 51 is supplied with a high-voltage negative charge. An insulating wall 9 is provided between the first annular electrode 41 and the spring electrode 51 to reduce the interference of the electric field therebetween. The insulating wall 9 is made of insulating ceramic and its height is suitable so as not to interfere with the passage of droplets sprayed from the second nozzle 321 to the first nozzle 311.

[0022] Specifically, refer to Figure 1 and Figure 2 The spring electrode 51 is configured as a conical helical spring, and its minimum inner diameter end is larger than the outer diameter of the first nozzle 311, and its maximum inner diameter is smaller than the diffusion diameter of the first nozzle 311 at its optimal spray diffusion layer. The axial length of the spring electrode 51 is smaller than the distance between the mist outlet of the first nozzle 311 and its optimal spray diffusion layer; wherein the optimal spray diffusion layer refers to the area where the spray droplets are most evenly distributed.

[0023] In addition, a vibration unit 52 is provided on the spray basin for applying a vibration frequency close to the resonant frequency of the spring electrode 51. The vibration frequency can be equal to the resonant frequency of the spring electrode 51, or can be less than the resonant frequency of the spring electrode 51. In the present embodiment, the vibration frequency is slightly less than the vibration frequency of the spring electrode 51 to prevent the spring electrode 51 from experiencing metal fatigue due to long-term operation. The vibration unit 52 can be a mechanical vibrator or an electromagnetic vibrator, and the smallest inner diameter end of the spring electrode 51 is mounted on the output end of the vibration unit 52.

[0024] Therefore, when preparing kaolin spray microspheres, kaolin and deionized water are first evenly mixed into kaolin slurry, and then various additives with set ratios are mixed with deionized water to form additive slurry. The kaolin slurry is passed into multiple second slurry tubes 322 at high pressure, and the additive slurry is passed into the first slurry tube 312 at high pressure. The flow rate of droplets sprayed from the first nozzle 311 and the second nozzle 321 is controlled by the first flow solenoid valve 81 and the second flow solenoid valve 82, so that when the first nozzle 311 sprays the additive slurry, the multiple surrounding second nozzles 321 also spray the kaolin slurry, so that efficient mixing can be achieved while ensuring the ratio of the additive slurry and the kaolin slurry.

[0025] At the same time, when the electrostatic generator 6 is working, it outputs high-voltage positive charge to the first annular electrode 41 and high-voltage negative charge to the spring electrode 51, so that the auxiliary agent droplets sprayed from the first nozzle 311 are negatively charged, and the kaolin droplets sprayed from the second nozzle 321 are positively charged. In this way, the auxiliary agent droplets and the kaolin droplets can be mixed under the mutual attraction of their own positive and negative charges. Compared with conventional stirring and mixing, this method can greatly promote the mixing efficiency of kaolin and auxiliary agents; and because the two are mixed in the form of droplets, the mixing uniformity of the two can be greatly promoted.

[0026] Moreover, since the spring electrode 51 is configured as a conical coil spring, its cone shape is close to the diffusion model of the auxiliary agent droplets sprayed from the first nozzle 311, so that the spring electrode 51 can charge the auxiliary agent droplets more evenly; at the same time, the vibration unit 52 applies high-frequency vibration to the spring electrode 51, so that the spring electrode 51 can not only charge the auxiliary agent droplets, but also further add oblique kinetic energy to the auxiliary agent droplets and improve the uniformity of the auxiliary agent droplets, so that the auxiliary agent droplets have sufficient kinetic energy to diffuse to the surrounding side, so as to further promote the capture and combination of the auxiliary agent droplets and the kaolin droplets on the surrounding side.

[0027] At the same time, in order to cooperate with the diffusion effect of the auxiliary agent droplets to the surrounding side under the action of the vibration unit 52, a second annular electrode 42 corresponding to the optimal spray diffusion layer of the first nozzle 311 is also arranged in the spray box 2. The inner diameter of the second annular electrode 42 is larger than the outer diameter of the spray disk 3. The second annular electrode 42 is connected to the electrostatic generator 6 and the electrostatic generator 6 outputs a high-voltage charge with the same polarity as the high-voltage charge on the first annular electrode 41, such as the high-voltage positive charge as described above.

[0028] In this way, under the action of the electric field of the second annular electrode 42, a repulsive force is applied to the positively charged kaolin droplets surrounding the auxiliary agent droplets, so that the kaolin droplets sprayed from the second nozzle 321 tend to move closer to the auxiliary agent droplets, thereby further promoting the mixing efficiency of the kaolin droplets and the auxiliary agent droplets.

[0029] In addition, the spray diffusion angle of the second nozzle 321 is smaller than the spray diffusion angle of the first nozzle 311 to ensure the uniformity of mixing of kaolin droplets and auxiliary agent droplets; and the first annular electrode 41 is conical, and its closing end is close to the second nozzle 321 to match the conical distribution of droplets sprayed from the first nozzle 311 as much as possible, thereby ensuring the uniformity of charge loading of the kaolin droplets by the first annular electrode 41.

[0030] At the same time, refer to Figure 1 and Figure 2In order to prevent the hot air in the drying box 1 from causing significant interference to the mixing of the kaolin droplets and the auxiliary agent droplets, in another feasible embodiment, an air guide cone 7 with a closed end extending into the drying box 1 is further provided at the joint of the spray box 2 and the drying box 1, and the closed end inner diameter of the air guide cone 7 is smaller than the outer diameter of the spray disc 3. In this way, under the influence of the air guide cone 7, the probability of the hot air in the drying box 1 surging into the spray box 2 is low, and it will not cause significant interference to the mixed droplets of the kaolin droplets and the auxiliary agent droplets.

[0031] The present application discloses a method for preparing an in-situ crystallization catalyst. Based on the above-mentioned in-situ crystallization catalyst production line, refer to Figure 1 , which comprises the following steps: S1. The kaolin is mixed with deionized water to form a kaolin slurry, and the additive is mixed with deionized water in a ratio to form an additive slurry; S2. Passing kaolin slurry into multiple second nozzles 321 at high pressure, passing auxiliary agent slurry into the first nozzle 311 at high pressure, controlling the spray flow rate ratio of multiple second nozzles 321 and the first nozzle 311 according to the ratio of kaolin and auxiliary agent, preparing kaolin spray microspheres in the spray box 2, drying in the drying box 1, and then calcining, mixing with silicon source, alkaline solution and directing agent for crystallization, filtering, washing and drying the filter cake to obtain an in-situ crystallization product; S3. The in-situ crystallization product is exchanged and calcined with one or more of ammonium salt, rare earth or phosphorus to obtain an in-situ crystallization catalyst.

[0032] Among them, in step S2, the first nozzle 311 and the multiple second nozzles 321 spray auxiliary agent droplets and kaolin droplets respectively, and then use the different charges applied to the auxiliary agent droplets and kaolin droplets by the spring electrode 51 and the first annular electrode 41 to promote the mixing efficiency and mixing uniformity of the two.

[0033] The embodiment of the present application discloses an in-situ crystallization catalyst, which is prepared by the above-mentioned in-situ crystallization catalyst preparation method.

[0034] The implementation principle of an in-situ crystallization catalyst production line in the embodiment of the present application is: When preparing kaolin spray microspheres, kaolin and deionized water are first uniformly mixed into kaolin slurry, and then various additives with set ratios are mixed with deionized water to form additive slurry. The kaolin slurry is passed into multiple second slurry pipes 322 at high pressure, and the additive slurry is passed into the first slurry pipe 312 at high pressure. The flow rate of droplets sprayed from the first nozzle 311 and the second nozzle 321 is controlled by the first flow solenoid valve 81 and the second flow solenoid valve 82, so that when the first nozzle 311 sprays the additive slurry, the multiple surrounding second nozzles 321 also spray the kaolin slurry.

[0035] At the same time, when the electrostatic generator 6 is working, it outputs high-voltage positive charge to the first annular electrode 41 and high-voltage negative charge to the spring electrode 51, so that the auxiliary agent droplets sprayed from the first nozzle 311 are negatively charged, and the kaolin droplets sprayed from the second nozzle 321 are positively charged. In this way, the auxiliary agent droplets and the kaolin droplets can be mixed under the mutual attraction of their own positive and negative charges. Compared with conventional stirring and mixing, this method can greatly promote the mixing efficiency of kaolin and auxiliary agents; and because the two are mixed in the form of droplets, the mixing uniformity of the two can be greatly promoted.

[0036] Moreover, since the spring electrode 51 is configured as a conical coil spring, its cone shape is close to the diffusion model of the auxiliary agent droplets sprayed from the first nozzle 311, so that the spring electrode 51 can charge the auxiliary agent droplets more evenly; at the same time, the vibration unit 52 applies high-frequency vibration to the spring electrode 51, so that the spring electrode 51 can not only charge the auxiliary agent droplets, but also further add oblique kinetic energy to the auxiliary agent droplets and improve the uniformity of the auxiliary agent droplets, so that the auxiliary agent droplets have sufficient kinetic energy to diffuse to the surrounding side, so as to further promote the capture and combination of the auxiliary agent droplets and the kaolin droplets on the surrounding side.

[0037] Unless otherwise defined, the technical terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The words "first", "second", "third" and similar words used in the specification and claims of this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and similar words do not indicate a quantitative limit, but indicate that there is at least one. "Include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0038] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. An in-situ crystallization catalyst production line, comprising a microsphere spray device and a drying oven (1), characterized in that: The microsphere spray device comprises a spray box (2) connected to the drying box (1), and a plurality of spray modules are arranged on the top of the spray box (2), and the spray modules include: A spray plate (3) mounted on the top of the spray box (2); A first nozzle (311) is disposed at the center of the spray disc (3) and is connected to a first slurry pipe (312), wherein the first slurry pipe (312) transports auxiliary agent slurry at high pressure; A plurality of second nozzles (321) are provided and located at the edge of the spray disc (3), the plurality of second nozzles (321) are distributed in a circular array with equal spacing about the central axis of the spray disc (3), the second nozzles (321) are connected to a second slurry pipe (322), kaolin slurry is transported in the second slurry pipe (322) under high pressure, and the spray direction of the second nozzles (321) is obliquely directed toward the optimal spray diffusion layer of the first nozzle (311); A first annular electrode (41), an insulating ring, is arranged at the mist outlet of the second nozzle (321). a spring electrode (51), an insulating sleeve disposed at the mist outlet of the first nozzle (311); and The electrostatic generator (6) is used to output high voltage charges of different polarities to the first annular electrode (41) and the spring electrode (51), respectively.

2. The in-situ crystallization catalyst production line according to claim 1, characterized in that: The spring electrode (51) is configured as a conical helical spring, and its minimum inner diameter end is larger than the outer diameter of the first nozzle (311), and its maximum inner diameter is smaller than the diffusion diameter of the first nozzle (311) at its optimal spray diffusion layer.

3. The in-situ crystallization catalyst production line according to claim 2, characterized in that: The axial length of the spring electrode (51) is less than the distance between the mist outlet of the first nozzle (311) and its optimal spray diffusion layer.

4. The in-situ crystallization catalyst production line according to claim 3, characterized in that: The spray basin is provided with a vibration unit (52) for applying a vibration frequency close to the resonance frequency of the spring electrode (51) to the spring electrode (51).

5. The in-situ crystallization catalyst production line according to claim 1, characterized in that: The spray box (2) is provided with a second annular electrode (42) corresponding to the optimal spray diffusion layer of the first nozzle (311); the inner diameter of the second annular electrode (42) is larger than the outer diameter of the spray disk (3); the second annular electrode (42) is connected to the electrostatic generator (6) and the electrostatic generator (6) outputs a high-voltage charge having the same polarity as the high-voltage charge on the first annular electrode (41).

6. The in-situ crystallization catalyst production line according to claim 1, characterized in that: The spray diffusion angle of the second nozzle (321) is smaller than the spray diffusion angle of the first nozzle (311).

7. The in-situ crystallization catalyst production line according to claim 1, characterized in that: The first annular electrode (41) is in the shape of a cone, and its closing end is close to the second nozzle (321).

8. The in-situ crystallization catalyst production line according to claim 1, characterized in that: The joint between the spray box (2) and the drying box (1) is provided with an air guide cone (7) whose closed end extends into the drying box (1).

9. A method for preparing an in-situ crystallization catalyst, based on an in-situ crystallization catalyst production line according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. The kaolin and deionized water are mixed to form a kaolin slurry, and the additive is mixed with deionized water in a ratio to form an additive slurry; S2. passing the kaolin slurry into the plurality of second nozzles (321) at high pressure, passing the auxiliary agent slurry into the first nozzle (311) at high pressure, controlling the spray flow rate ratio of the plurality of second nozzles (321) and the first nozzle (311) according to the ratio of kaolin to auxiliary agent, preparing kaolin spray microspheres in the spray box (2), drying them in the drying box (1), calcining them, mixing them with a silicon source, an alkaline solution and a directing agent for crystallization, filtering, washing and drying the filter cake to obtain an in-situ crystallization product; S3. exchanging and calcining the in-situ crystallization product with one or more of ammonium salt, rare earth or phosphorus to obtain an in-situ crystallization catalyst.

10. An in-situ crystallization catalyst, characterized in that: The catalyst is prepared by the in-situ crystallization catalyst preparation method as claimed in claim 9.

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