Surface-functionalized fiber-reinforced guide plate for desulfurization system and preparation method of surface-functionalized fiber-reinforced guide plate

Abstract

The invention discloses a surface-functionalized fiber-reinforced guide plate for a desulfurization system and a preparation method of the surface-functionalized fiber-reinforced guide plate, and belongs to the field of chemical engineering. The preparation method of the guide plate comprises the steps of continuous alumina fiber preparation, fiber reinforced guide plate preparation and chemical vapor deposition surface function strengthening. Surface functionalization is carried out by adopting a chemical vapor deposition method, a silicon salt precursor is subjected to a gas phase chemical reaction under the action of ozone, and generated active silica species are diffused and deposited on the surface of the guide plate and in pores, so that a silicon-based oxide coating firmly combined with a substrate is formed; the bonding strength of the coating and a matrix is much higher than that of a traditional physical adsorption coating; finally, the wear resistance and washing resistance of the guide plate are improved through the functionalized surface, and the Si-O bond on the surface can effectively inhibit heterogeneous nucleation and adhesion of gypsum and other substances in the desulfurization slurry, so that the anti-scaling capacity of the guide plate is improved.

Description

A surface-functionalized fiber-reinforced baffle plate for desulfurization systems and its preparation method Technical Field

[0001] This invention belongs to the field of desulfurization, specifically relating to a surface-functionalized fiber-reinforced guide plate for a desulfurization system and its preparation method. Background Technology

[0002] In coal-fired power plants and industrial flue gas desulfurization systems, baffles are key components ensuring uniform flue gas distribution. They are typically located in the inlet flue of the desulfurization tower or inside the absorption tower. Their core function is to optimize the flue gas flow path, reduce eddies and dead zones, thereby improving desulfurization efficiency and preventing localized ash or scale buildup. The airflow distribution and anti-scaling performance of the baffles directly determine desulfurization efficiency and operational stability. However, in actual operation, baffles face significant challenges. For example, in coal-fired power plants, flue gas parameters (such as dust concentration and temperature) often deviate from design values, leading to ash accumulation or blockage in the baffle area, affecting airflow distribution. Furthermore, the overall operational stability of the desulfurization system is affected by fluctuations in coal quality, equipment aging, and changes in operating parameters. As part of the system, the effectiveness of the baffle is indirectly related to fluctuations in desulfurization efficiency, which in some power plants fails to reach expected levels due to improper design or operation. Moreover, baffles require high maintenance, necessitating regular cleaning of accumulated ash, but this operation is complex and costly. Meanwhile, when the system is upgraded or modified, the design of the baffle plate may be difficult to adapt to new flue gas conditions (such as changes in coal quality), leading to long-term operational risks.

[0003] Traditional metal, fiberglass, or ordinary ceramic baffles have long faced severe challenges. These include corrosion and aging caused by acidic slurry environments, flow channel blockage due to gypsum and ash adhesion, material brittleness or insufficient strength making it difficult to withstand high-velocity erosion, and thermal shock damage from temperature fluctuations. These defects force frequent system downtime for maintenance, increasing operation and maintenance costs and hindering the continuous improvement of desulfurization efficiency. The development of surface-functionalized fiber-reinforced baffles aims to systematically address the inherent defects of traditional materials and promote the upgrading of desulfurization technology. By combining continuous alumina fiber reinforcement with a porous ceramic matrix, the mechanical strength, erosion resistance, and corrosion resistance of the baffles are significantly improved, fundamentally extending component life. A scale-resistant coating is constructed using chemical vapor deposition surface functionalization technology, effectively inhibiting gypsum adhesion and reducing flow resistance and maintenance frequency. The lightweight porous structure design reduces tower load while ensuring load-bearing performance and enables the resource utilization of solid waste such as fly ash. Summary of the Invention

[0004] The present invention addresses the aforementioned deficiencies by providing a surface-functionalized fiber-reinforced guide plate for desulfurization systems.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] A method for preparing a surface-functionalized fiber-reinforced baffle plate for a desulfurization system, the method being as follows:

[0007] (1) Preparation of continuous alumina fibers

[0008] Aluminum salt and deionized water are mixed and stirred under constant temperature water bath conditions to form aluminum sol. Then, silicon salt and polyvinyl alcohol are added and stirring is continued. Dilute nitric acid solution is added dropwise to adjust the pH to obtain a mixed sol. The mixed sol is then aged under a second constant temperature water bath condition. After aging, the mixed sol is transferred to a vacuum drying oven and degassed under constant temperature vacuum conditions to obtain a uniform spinning sol.

[0009] Under nitrogen gas conditions, a uniform spinning sol is extruded into the high-temperature channel of a dry spinning machine, and then the gel fibers are collected by a winding machine. The gel fibers are then placed in a muffle furnace for low-temperature dehydration and high-temperature pre-oxidation to obtain continuous alumina fibers.

[0010] (2) Preparation of fiber-reinforced guide plate

[0011] Weigh fly ash, bauxite, silicon dioxide, sintering aid, and continuous alumina fiber prepared in step (1), mix them, and place them in a ball mill for ball milling. After ball milling, add organic foaming agent, binder, and deionized water, and wet mix them in a mixer to form a billet. Then inject the billet into a porous mold for extrusion molding, and place the molded billet in a vacuum freeze dryer for freeze drying to form a porous lightweight billet.

[0012] The porous lightweight preform is placed in a high-temperature atmosphere sintering furnace and first calcined at low temperature under nitrogen conditions, and then calcined at high temperature under oxygen conditions to form a fiber-reinforced guide plate.

[0013] (3) Enhancement of surface functionality through chemical vapor deposition

[0014] After washing and drying the fiber-reinforced guide plate prepared in step (2), it was placed in a chemical vapor deposition chamber. After evacuation, nitrogen gas was introduced and the temperature was raised. Finally, the silicon salt was carried into the chemical vapor deposition chamber by nitrogen gas, and ozone was introduced at the same time for deposition. After deposition, it was placed in a muffle furnace for high-temperature calcination to obtain a surface-functionalized fiber-reinforced guide plate.

[0015] Furthermore, the aluminum salt in step (1) is basic aluminum acetate, the silicon salt is tetraethyl orthosilicate, the dilute nitric acid is a nitric acid solution with a mass fraction of 5-10%, and the mass ratio of aluminum salt, deionized water, silicon salt and polyvinyl alcohol is 1:(2-3):(0.4-0.8):(0.05-0.10), and the pH is adjusted to 3-4.

[0016] Furthermore, in step (1), the temperature of the constant temperature water bath stirring is 70~90℃, and the stirring speed is 100~150rpm; the temperature of the secondary constant temperature water bath is 40~60℃, and the duration of the secondary constant temperature water bath is 24~48h; the temperature of the constant temperature vacuum is 25~35℃, and the vacuum degree of the constant temperature vacuum is 10. -3 ~10 -5 Pa, the degassing time is 2~4h.

[0017] Furthermore, in step (1), the pressure of nitrogen gas introduced is 0.5~0.8MPa, the rate of nitrogen gas introduction is 10~20mL / min, the temperature of the high-temperature tunnel is 120~150℃, and the rotation speed of the winding machine is 50~100rpm; the temperature of low-temperature dehydration is 350~450℃, and the time of low-temperature dehydration is 1~2h; the temperature of high-temperature pre-oxidation is 800~1000℃, and the time of high-temperature pre-oxidation is 2~4h.

[0018] Furthermore, in step (2), the sintering aid is glass powder, the organic foaming agent is carboxymethyl cellulose, and the binder is a polyvinyl alcohol solution with a mass fraction of 10-15%.

[0019] The mass ratio of fly ash, bauxite, silica, sintering aid, continuous alumina fiber, organic foaming agent, binder, and deionized water is 1: (0.3~0.6): (0.1~0.2): (0.05~0.1): (0.08~0.16): (0.05~0.10): (0.1~0.2): (0.2~0.4).

[0020] Furthermore, in step (2), the ball milling speed is 200~400 rpm, the ball milling time is 2~4 h; the wet mixing time is 1~2 h; the extrusion molding pressure is 4~8 MPa; the freeze drying temperature is -40~-50℃, the freeze drying time is 48~96 h; the nitrogen gas introduction rate is 20~40 mL / min; the low temperature calcination temperature is 500~600℃, the low temperature calcination time is 2~4 h; the oxygen introduction rate is 30~60 mL / min; the high temperature calcination temperature is 1350~1450℃, the high temperature calcination time is 3~6 h.

[0021] Furthermore, the silicon salt mentioned in step (3) is tetraethyl orthosilicate, and the mass ratio of fiber-reinforced perforated plate to silicon salt is 1:(0.01~0.03); the drying temperature is 120~140℃, and the drying time is 4~8h; the vacuum degree of vacuuming is 10. -3 ~10 -5The nitrogen gas is introduced at a rate of 100-150 mL / min, the temperature is increased to 350-450℃, the ozone gas is introduced at a rate of 20-40 mL / min, the high-temperature calcination temperature is 500-600℃, and the high-temperature calcination time is 2-4 h.

[0022] The desulfurization system described in the technical solution of this invention includes, but is not limited to, the following structure: an absorption tower, a slurry circulation pump, an oxidation fan, a demister, and a slurry treatment unit. The absorption tower is provided with a slurry pool, and from the top of the flue gas inlet, from bottom to top, it is provided with a surface-functionalized fiber-reinforced guide plate, a stepped turbulence enhancement unit, and a swirl-coupled spray layer.

[0023] Beneficial effects:

[0024] (1) In order to avoid the high energy consumption and grain coarsening problems of traditional melt spinning or impregnation sintering methods, this invention uses molecular-level mixing of aluminum salt and silicon salt in sol state and combines polyvinyl alcohol as a spinning aid to achieve micro-uniformity of each component in the precursor stage. At the same time, the solvent is rapidly evaporated in the high-temperature channel by dry spinning, so that the gel fiber can better maintain axial orientation and reduce defects during the formation process. In addition, the preparation process of continuous alumina fiber is carried out under relatively mild chemical and temperature conditions, avoiding the high energy consumption and grain coarsening problems caused by high temperature. The continuous alumina fiber converted from gel fiber by high temperature pre-oxidation treatment can outperform the brittle short-cut or coarse-grained fibers prepared by traditional methods in terms of flexibility and strength due to its fine-grained structure and low impurity content. This provides performance support for improving the mechanical strength of the guide plate.

[0025] (2) To avoid the problem of low porosity caused by traditional direct molding sintering or simple casting, this invention utilizes the introduction of continuous alumina fibers to effectively bridge cracks and dissipate energy through load transfer between the fiber-ceramic matrix interface, fundamentally overcoming the inherent brittleness of traditional ceramic materials; at the same time, by using organic foaming agents combined with vacuum freeze-drying technology, a uniform, interconnected and controllable three-dimensional network with pore structure is constructed in situ within the green body, allowing for more precise control of the porosity and pore size distribution of the guide plate; in addition, this invention ensures uniform dispersion of fibers in the green body through wet mixing and extrusion molding, avoiding powder agglomeration caused by dry mixing; the freeze-drying process removes moisture by ice crystal sublimation, avoiding pore structure collapse caused by the surface tension of liquid water, and preserving the porous skeleton; finally, the segmented calcination under a nitrogen / oxygen atmosphere can achieve both low-temperature safe removal of organic matter and high-temperature atmosphere control to complete the sintering of the matrix ceramic, ultimately obtaining a composite guide plate green body with lightweight, high specific strength and excellent thermal shock resistance;

[0026] (3) In order to avoid the problem of low bonding strength between the surface coating and the substrate material caused by traditional surface modification technologies such as surface spraying, dip coating or electroplating, the present invention adopts chemical vapor deposition for surface functionalization. The silicon salt precursor undergoes a gas-phase chemical reaction under the action of ozone, and the generated active silicon oxide species diffuse and deposit on the surface of the guide plate and inside the pores, forming a silicon-based oxide coating that is firmly bonded to the substrate. The bonding strength between the coating and the substrate is much higher than that of the traditional coating with physical adsorption. Finally, the wear resistance and scouring resistance of the guide plate are improved through this functionalized surface. The Si-O bond on its surface can effectively inhibit the heterogeneous nucleation and adhesion of substances such as gypsum in the desulfurization slurry, thereby improving the anti-scaling ability of the guide plate. Detailed Implementation

[0027] The present invention will be further described below with reference to embodiments, but the scope of protection of the present invention is not limited thereto:

[0028] Example 1

[0029] (1) Preparation of continuous alumina fibers

[0030] 30g of basic aluminum acetate and 60g of deionized water were mixed and stirred at 100rpm in a 70℃ constant temperature water bath to form an aluminum sol. Then, 12g of tetraethyl orthosilicate and 1.5g of polyvinyl alcohol were added and stirring continued. A 5% (w / w) dilute nitric acid solution was added dropwise to adjust the pH to 3, resulting in a mixed sol. The mixed sol was then aged in a 40℃ constant temperature water bath for 48 hours. After aging, the mixed sol was transferred to a vacuum drying oven and dried under constant temperature and vacuum (vacuum degree 10) at 25℃. -3 Degassing was performed for 4 hours under conditions of Pa) to obtain a uniform spinning sol;

[0031] Under nitrogen gas conditions (nitrogen pressure of 0.5 MPa and nitrogen gas flow rate of 10 mL / min), a uniform spinning sol was extruded into the high-temperature channel of a dry spinning machine (temperature of the high-temperature channel is 120°C). Then, gel fibers were collected by a winding machine (winding speed of 50 rpm). The gel fibers were then placed in a muffle furnace for low-temperature dehydration at 350°C for 2 hours and then pre-oxidized at 800°C for 4 hours to obtain continuous alumina fibers.

[0032] (2) Preparation of fiber-reinforced guide plate

[0033] Weigh 50g fly ash, 15g bauxite, 5g silica, 2.5g glass powder, and 4g of continuous alumina fiber prepared in step (1), mix them, and place them in a ball mill at 200 rpm for 4 hours. After ball milling, add 2.5g carboxymethyl cellulose, 5g polyvinyl alcohol solution with a mass fraction of 10%, and 10g deionized water. Wet mix them in a mixer for 1 hour to form a billet. Then, inject the billet into a porous mold for extrusion molding (the extrusion molding pressure is 4 MPa). Place the molded billet in a vacuum freeze dryer at -40℃ for 96 hours to freeze dry, forming a porous lightweight billet.

[0034] The porous lightweight preform was placed in a high-temperature atmosphere sintering furnace and first calcined at 500℃ for 4 hours under nitrogen gas (nitrogen gas introduction rate of 20 mL / min), and then calcined at 1350℃ for 6 hours under oxygen gas (oxygen introduction rate of 30 mL / min) to form a fiber-reinforced guide plate.

[0035] (3) Enhancement of surface functionality through chemical vapor deposition

[0036] The fiber-reinforced guide plate (76g) prepared in step (2) was washed and dried at 120°C for 8 hours, then placed in a chemical vapor deposition chamber and evacuated (vacuum degree 10). -3 After passing through the chemical vapor deposition chamber (CCVD) at a rate of 100 mL / min, nitrogen gas is introduced and the temperature is raised to 350 °C. Finally, 0.76 g of tetraethyl orthosilicate is introduced into the CCVD chamber using nitrogen gas, while ozone is introduced at a rate of 20 mL / min for deposition. After deposition, the material is placed in a muffle furnace and calcined at 500 °C for 4 h to obtain a surface-functionalized fiber-reinforced guide plate.

[0037] (4) Performance testing

[0038] Bulk density test: The Archimedes' displacement method was used to test the bulk density of the functionalized fiber-reinforced guide plate, and the result was 0.9 g / cm³. 3 ;

[0039] Thermal shock stability test: The sample was heated to 350°C in a muffle furnace and then quickly immersed in room temperature water for quenching. After 5 cycles, the surface cracks of the sample were observed. The surface functionalized fiber-reinforced guide plate showed no obvious cracks after 5 cycles of thermal shock test.

[0040] Corrosion resistance test: Prepare 200 mL of acidic NaCl solution with pH 2 (adjust the pH of the NaCl solution with hydrochloric acid, and the mass fraction of NaCl is 10%), then immerse the surface functionalized fiber reinforced guide plate in the acidic NaCl solution for 96 h, and measure the mass change of the sample before and after immersion. The mass of the surface functionalized fiber reinforced guide plate decreased by 0.08% before and after immersion.

[0041] Example 2

[0042] (1) Preparation of continuous alumina fibers

[0043] 30g of basic aluminum acetate and 90g of deionized water were mixed and stirred at 150rpm in a 90℃ constant temperature water bath to form an aluminum sol. Then, 24g of tetraethyl orthosilicate and 3g of polyvinyl alcohol were added and stirring continued. A 10% (w / w) dilute nitric acid solution was added dropwise to adjust the pH to 4 to obtain a mixed sol. The mixed sol was then aged in a 60℃ constant temperature water bath for 24 hours. After aging, the mixed sol was transferred to a vacuum drying oven and dried under constant temperature and vacuum (vacuum degree 10) at 35℃. -5 Degassing was performed for 2 hours under conditions of Pa) to obtain a uniform spinning sol;

[0044] Under nitrogen gas conditions (nitrogen pressure of 0.8 MPa and nitrogen gas flow rate of 20 mL / min), a uniform spinning sol was extruded into the high-temperature channel of a dry spinning machine (temperature of 150°C). The gel fibers were then collected by a winding machine (winding speed of 100 rpm). The gel fibers were then placed in a muffle furnace for low-temperature dehydration at 450°C for 1 hour and then pre-oxidized at 1000°C for 2 hours to obtain continuous alumina fibers.

[0045] (2) Preparation of fiber-reinforced guide plate

[0046] Weigh 50g fly ash, 30g bauxite, 10g silica, 5g glass powder, and 8g of continuous alumina fiber prepared in step (1), mix them, and place them in a ball mill at 400 rpm for 2 hours. After ball milling, add 5g carboxymethyl cellulose, 10g polyvinyl alcohol solution with a mass fraction of 15%, and 20g deionized water. Wet mix them in a mixer for 2 hours to form a billet. Then, inject the billet into a porous mold for extrusion molding (the extrusion molding pressure is 8 MPa). Place the molded billet in a vacuum freeze dryer at -50℃ for 48 hours to freeze dry, forming a porous lightweight billet.

[0047] The porous lightweight preform was placed in a high-temperature atmosphere sintering furnace and first calcined at 600℃ for 2 hours under nitrogen gas (nitrogen gas introduction rate of 40 mL / min), and then calcined at 1450℃ for 3 hours under oxygen gas (oxygen introduction rate of 60 mL / min) to form a fiber-reinforced guide plate.

[0048] (3) Enhancement of surface functionality through chemical vapor deposition

[0049] The fiber-reinforced guide plate (97g) prepared in step (2) was washed and dried at 140°C for 4 hours, then placed in a chemical vapor deposition chamber and evacuated (vacuum degree 10). -5After passing through the chemical vapor deposition chamber (CCVD) at a rate of 150 mL / min, nitrogen gas is introduced and the temperature is raised to 450 °C. Finally, 2.91 g of tetraethyl orthosilicate is introduced into the CCVD chamber using nitrogen gas, while ozone is introduced at a rate of 40 mL / min for deposition. After deposition, the material is placed in a muffle furnace and calcined at 600 °C for 2 hours to obtain a surface-functionalized fiber-reinforced guide plate.

[0050] (4) Performance testing

[0051] Bulk density test: The Archimedes' displacement method was used to test the bulk density of the functionalized fiber-reinforced guide plate, and the result was 1.1 g / cm³. 3 ;

[0052] Thermal shock stability test: The sample was heated to 350°C in a muffle furnace and then quickly immersed in room temperature water for quenching. After 5 cycles, the surface cracks of the sample were observed. The surface functionalized fiber-reinforced guide plate showed no obvious cracks after 5 cycles of thermal shock test.

[0053] Corrosion resistance test: Prepare 200 mL of acidic NaCl solution with pH 2 (adjust the pH of the NaCl solution with hydrochloric acid, and the mass fraction of NaCl is 10%), then immerse the surface functionalized fiber reinforced guide plate in the acidic NaCl solution for 96 h, and measure the mass change of the sample before and after immersion. The mass of the surface functionalized fiber reinforced guide plate decreased by 0.05% before and after immersion.

Claims

1. A method for preparing a surface-functionalized fiber-reinforced guide plate for a desulfurization system, characterized in that: The preparation method of the surface functionalized fiber-reinforced guide plate is as follows: (1) Preparation of continuous alumina fiber: Alumina salt and deionized water are mixed and stirred under constant temperature water bath conditions to form aluminum sol. Then, silicon salt and polyvinyl alcohol are added and stirred. Dilute nitric acid solution is added to adjust the pH to obtain mixed sol. The mixed sol is then aged under a second constant temperature water bath condition. After aging, the mixed sol is transferred to a vacuum drying oven and degassed under constant temperature vacuum conditions to obtain uniform spinning sol. Under nitrogen gas conditions, the uniform spinning sol is squeezed into the high temperature channel of the dry spinning machine. Then, gel fibers are collected by the winding machine. The gel fibers are then placed in a muffle furnace for low temperature dehydration and high temperature pre-oxidation to obtain continuous alumina fiber. (2) Preparation of fiber-reinforced guide plate: Fly ash, bauxite, silicon dioxide, sintering aid, and the continuous alumina fiber prepared in step (1) are weighed. Aluminum fibers are mixed and placed in a ball mill for ball milling. After ball milling, organic foaming agent, binder and deionized water are added and wet-mixed in a mixer to form a billet. Then the billet is injected into a porous mold for extrusion molding. The formed billet is then placed in a vacuum freeze dryer for freeze drying to form a porous lightweight billet. The porous lightweight billet is placed in a high-temperature atmosphere sintering furnace and first calcined at low temperature under nitrogen conditions, and then calcined at high temperature under oxygen conditions to form a fiber-reinforced guide plate. (3) Chemical vapor deposition surface functional enhancement: The fiber-reinforced guide plate prepared in step (2) is washed and dried and placed in a chemical vapor deposition chamber. After vacuuming, nitrogen is introduced and the temperature is raised. Finally, nitrogen is used to carry silicon salt into the chemical vapor deposition chamber, and ozone is introduced for deposition. After deposition, it is placed in a muffle furnace for high-temperature calcination to obtain a surface-functionalized fiber-reinforced guide plate.

2. The preparation method according to claim 1, characterized in that, The aluminum salt in step (1) is basic aluminum acetate, the silicon salt is tetraethyl orthosilicate, the dilute nitric acid is a nitric acid solution with a mass fraction of 5-10%, and the mass ratio of aluminum salt, deionized water, silicon salt and polyvinyl alcohol is 1:(2-3):(0.4-0.8):(0.05-0.10). The pH is adjusted to 3-4.

3. The preparation method according to claim 1, characterized in that, The temperature of the constant temperature water bath stirring in step (1) is 70~90℃, and the stirring speed is 100~150rpm; the temperature of the secondary constant temperature water bath is 40~60℃, and the duration of the secondary constant temperature water bath is 24~48h; the temperature of the constant temperature vacuum is 25~35℃, and the vacuum degree of the constant temperature vacuum is 10. -3 ~10 -5 Pa, the degassing time is 2~4h.

4. The preparation method according to claim 1, characterized in that, In step (1), the pressure of nitrogen gas introduced is 0.5~0.8MPa, the rate of nitrogen gas introduction is 10~20mL / min, the temperature of the high-temperature tunnel is 120~150℃, and the rotation speed of the winding machine is 50~100rpm; the temperature of low-temperature dehydration is 350~450℃, and the time of low-temperature dehydration is 1~2h; the temperature of high-temperature pre-oxidation is 800~1000℃, and the time of high-temperature pre-oxidation is 2~4h.

5. The preparation method according to claim 1, characterized in that, Step (2) The sintering aid is glass powder, the organic foaming agent is carboxymethyl cellulose, and the binder is a polyvinyl alcohol solution with a mass fraction of 10~15%; the mass ratio of fly ash, bauxite, silica, sintering aid, continuous alumina fiber, organic foaming agent, binder and deionized water is 1: (0.3~0.6): (0.1~0.2): (0.05~0.1): (0.08~0.16): (0.05~0.10): (0.1~0.2): (0.2~0.4).

6. The preparation method according to claim 1, characterized in that, The ball milling speed in step (2) is 200~400 rpm, the ball milling time is 2~4 h; the wet mixing time is 1~2 h; the extrusion molding pressure is 4~8 MPa; the freeze drying temperature is -40~-50℃, the freeze drying time is 48~96 h; the nitrogen gas introduction rate is 20~40 mL / min; the low temperature calcination temperature is 500~600℃, the low temperature calcination time is 2~4 h; The oxygen introduction rate is 30~60mL / min, the high-temperature calcination temperature is 1350~1450℃, and the high-temperature calcination time is 3~6h.

7. The preparation method according to claim 1, characterized in that, The silicon salt mentioned in step (3) is tetraethyl orthosilicate, and the mass ratio of fiber-reinforced perforated plate to silicon salt is 1:(0.01~0.03); the drying temperature is 120~140℃, and the drying time is 4~8h; the vacuum degree of vacuuming is 10. -3 ~10 -5 The nitrogen gas is introduced at a rate of 100-150 mL / min, the temperature is increased to 350-450℃, the ozone gas is introduced at a rate of 20-40 mL / min, the high-temperature calcination temperature is 500-600℃, and the high-temperature calcination time is 2-4 h.

8. A surface-functionalized fiber-reinforced baffle plate for a desulfurization system, characterized in that, It is prepared by the method described in any one of claims 1 to 7.