Graphite paper self-cleaning tar removal method

Abstract

The invention discloses a graphite paper self-cleaning tar-removing method, and particularly relates to the field of graphite paper processing, and the graphite paper self-cleaning tar-removing method comprises the following steps: S1, selecting graphite paper with excellent thermal conductivity and chemical stability, and ensuring uniform thickness and smooth surface of the graphite paper; the self-adsorption characteristic of the graphite paper is utilized, tar in combustible gas can be effectively adsorbed, the self-weight stripping characteristic of the graphite paper after adsorption is utilized, the whole adsorption capacity of the graphite paper can be controlled not to be too large while the tar is adsorbed, caking with too large volume is not formed, and the installation part is selected in the cyclone dust collector and a front end pipeline; the irregular graphite paper wrapped with tar can be efficiently separated in a cyclone dust collector after adsorption, the graphite paper can still keep good thermal stability, bonding performance, wear resistance and corrosion resistance in a high-temperature environment in a bonding mode, direct construction can be conducted at the temperature of 400-1000 DEG C, and the coating performance is not affected.

Description

Technical Field

[0001] The invention relates to the field of graphite paper processing, and more particularly to a method for self-cleaning and removing tar from graphite paper. Background Art

[0002] The biomass carbonization process is a process of converting biomass materials (such as wood, crop residues, livestock and poultry manure, etc.) into biochar by pyrolysis under high temperature and anoxic conditions. A variety of by-products will be produced in this process, including gas, liquid (tar wood vinegar) and solid (biochar). Among them, the treatment of tar is a key issue in the biomass carbonization process, because tar is a complex oily mixture produced during the pyrolysis of biomass, and its main components include: aromatic hydrocarbons such as benzene, toluene, and xylene; phenols such as phenol and cresol; heterocyclic compounds such as pyridine and furan; aliphatic compounds such as alkanes and olefins. In addition, the tar component is easy to condense, and the viscosity is high after condensation. It is easy to adsorb and bond to the ash particles in the air flow and then agglomerate, which eventually leads to blockage of equipment and pipelines, which will seriously affect the continuous operation time of the equipment.

[0003] Several existing biomass carbonization process tar cleaning technologies and their characteristics are as follows:

[0004] 1. Thermal cracking method, that is, the tar molecules are cracked into small molecular gaseous compounds under high temperature conditions, thereby reducing the amount of tar. This method is highly efficient and can significantly reduce the amount of tar, but the overall energy consumption is high, the investment cost is also large, and it is often limited by the choice of carbonization temperature, resulting in a situation where the carbonization temperature and the appropriate temperature for tar thermal cracking cannot be well matched.

[0005] 2. Catalytic cracking method, that is, using catalysts to promote the cracking of tar at a lower temperature. This technology has low energy consumption and lower temperature requirements than thermal cracking method, but the catalyst used in the process is easy to deactivate, especially for carbonization equipment with large processing capacity. The catalyst replacement cycle is shorter, and it is necessary to select a suitable catalyst. In addition, high-performance catalysts are expensive and the process is complicated.

[0006] 3. Water washing method, that is, removing water-soluble components in tar by water washing. This technical process is simple, easy to operate, and has low investment cost, but it can only remove most of the water-soluble components. Most of the remaining tar requires organic solvents to dissolve, and this part of the non-water-soluble components is too viscous, which can easily affect the ability of the equipment to operate continuously. In addition, the wastewater generated by this technology requires special treatment, otherwise it may cause groundwater pollution. The treatment efficiency is also relatively low, and it is not suitable for the continuous operation of large-scale pyrolysis carbonization units.

[0007] 4. Mechanical separation refers to the separation of tar through cyclone separators, filters or electric coke collectors. It is simple to operate and easy to maintain, but the separation efficiency is limited and the tar cannot be completely removed. It is more suitable for gases with low tar content and has limited processing capacity.

[0008] 5. Adsorption method refers to the use of activated carbon, molecular sieve and other adsorption materials to adsorb harmful components in tar. The adsorption effect is good, and it can remove a variety of harmful components. The operation is simple and easy to control. However, the fixation and separation scheme of the adsorption material is difficult, and the cost of adsorption materials such as molecular sieve is relatively high.

[0009] 6. Biological treatment, that is, using microorganisms to degrade organic matter in tar. Biological treatment is environmentally friendly and does not produce secondary pollution, but it takes a long time to process, has low efficiency, poor operating stability, and requires the control of appropriate biological reaction conditions, and the process is complex.

[0010] 7. Plasma treatment, which uses high-energy plasma to crack tar molecules into simple small molecules. This type of technology is highly efficient, can quickly decompose tar, and can handle high-concentration tar. Its essential logic is similar to high-temperature thermal cracking tar removal technology, but it consumes more energy, has expensive equipment costs, and the related equipment is relatively complex, and requires a high level of professional technical support.

[0011] In order to solve the above problems, a technical solution is now provided. Summary of the invention

[0012] In order to overcome the above-mentioned defects of the prior art, an embodiment of the present invention provides a method for self-cleaning and removing tar from graphite paper to solve the problems raised in the above-mentioned background technology.

[0013] To achieve the above object, the present invention provides the following technical solutions:

[0014] A method for self-cleaning and removing tar from graphite paper comprises the following steps:

[0015] Step S1, selecting graphite paper with excellent thermal conductivity and chemical stability, ensuring that its thickness is uniform and the surface is flat;

[0016] Step S2, using the high temperature resistant inorganic silicate modified solution as a base material, mixing yttrium oxide, lanthanum oxide, cerium oxide, neodymium oxide and zirconium powder in a certain proportion to obtain a mixture, and fully stirring the mixture with the inorganic silicate modified solution until a uniform high temperature resistant binder is formed;

[0017] Step S3, cleaning the inner wall of the dust collector and its auxiliary equipment to ensure that the surface is free of oil, dust and other impurities;

[0018] Step S4, evenly coating the mixed high temperature resistant adhesive on the inner wall of the cyclone dust collector, and immediately attaching the graphite paper after coating the high temperature resistant adhesive;

[0019] Step S5, performing a curing process after attaching the graphite paper;

[0020] Step S6, setting a slag discharge port on the cyclone dust collector, and connecting a spiral slag discharger to the lower part of the cyclone dust collector.

[0021] In a preferred embodiment, in step S1, it is ensured that the specification of the graphite paper meets the required coverage area, and a graphite paper with a thickness between 0.1-0.5 mm is selected.

[0022] In a preferred embodiment, in step S3, the metal surface is sandblasted or polished to ensure the adhesion of the high temperature resistant adhesive.

[0023] In a preferred embodiment, in step S4, the coating thickness should be controlled between 0.1-0.3 mm;

[0024] After attaching the graphite paper, use a roller to gently press the graphite paper so that the graphite paper is fully in contact with the high temperature resistant adhesive.

[0025] In a preferred embodiment, in step S5, curing is performed at a temperature of about 200-500° C., and the material is allowed to stand for more than 24 hours after curing. During the curing process, it is ensured that the environment is free of vibration and external force interference.

[0026] In a preferred embodiment, in step S6, a comprehensive inspection is performed after the installation is completed to ensure that all connection parts are tight and there is no air leakage.

[0027] In a preferred embodiment, in step S6, the bonding and curing of the graphite paper are observed.

[0028] In a preferred embodiment, in step S6, tar will condense on the graphite paper, and will continue to accumulate and thicken. When the tar accumulated on the surface of the graphite paper reaches a critical weight, it will automatically fall off.

[0029] The technical effects and advantages of the graphite paper self-cleaning and tar removal method of the present invention are as follows:

[0030] 1. Multiple layers of graphite paper are arranged in the outlet airflow path of the carbonization equipment, and the high adsorption of graphite paper is used to adsorb the tar components in the airflow layer by layer. When the graphite paper adsorbs a certain amount of tar, it is desorbed by the self-weight of the graphite paper. The tar automatically drips into the collection device under the action of gravity. Combined with the enhanced cyclone separator, the tiny tar particles and other impurities in the airflow are further separated to improve the gas purification effect. This method makes full use of the high adsorption and high temperature resistance of graphite paper, combined with cyclone separation technology, to achieve efficient capture and treatment of tar, and reduce equipment maintenance and environmental pollution;

[0031] 2. Select inorganic binder composite materials with high temperature stability, such as yttrium oxide, lanthanum oxide, cerium oxide, neodymium oxide and zirconium powder in a reasonable ratio to ensure the strength and durability of the binder at high temperatures. Through experimental research, determine the optimal curing temperature range of the binder. The curing temperature range should be between 200-500°C to ensure the stability of the binder's performance at high temperatures, while avoiding excessively high temperatures that may cause the decomposition or failure of the binder. This method not only improves the bonding strength and stability of graphite paper in high temperature environments, but also ensures its long-term effectiveness and reliability during the carbonized tar treatment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the graphite paper attached to the cyclone dust collector of the present invention before use.

[0033] Figure 2 Schematic diagram of the working mechanism of graphite paper in the cyclone dust collector of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Example 1

[0036] The present invention provides a method for self-cleaning and removing tar from graphite paper, which specifically comprises the following steps:

[0037] Step S1, selecting graphite paper with excellent thermal conductivity and chemical stability, ensuring that its thickness is uniform and the surface is flat;

[0038] Step S2, using the high temperature resistant inorganic silicate modified solution as a base material, mixing yttrium oxide, lanthanum oxide, cerium oxide and zirconium powder in a certain proportion to obtain a mixture, and fully stirring the mixture with the inorganic silicate modified solution until a uniform high temperature resistant binder is formed;

[0039] Step S3, cleaning the inner wall of the dust collector and its auxiliary equipment to ensure that the surface is free of oil, dust and other impurities;

[0040] Step S4, evenly coating the mixed high temperature resistant adhesive on the inner wall of the cyclone dust collector, and immediately attaching the graphite paper after coating the high temperature resistant adhesive;

[0041] Step S5, performing a curing process after attaching the graphite paper;

[0042] Step S6, setting a slag discharge port on the cyclone dust collector, and connecting a spiral slag discharger to the lower part of the cyclone dust collector.

[0043] In step S1, ensure that the specification of the graphite paper meets the required coverage area, and select graphite paper with a thickness of 0.1 mm.

[0044] In step S3, the metal surface is sandblasted or polished to ensure the adhesion of the high temperature resistant adhesive.

[0045] In step S4, the coating thickness should be controlled at 0.1 mm;

[0046] After attaching the graphite paper, use a roller to gently press the graphite paper so that the graphite paper is fully in contact with the high temperature resistant adhesive.

[0047] In step S5, curing is performed at a temperature of 200° C. and the material is allowed to stand for more than 24 hours after curing. During the curing process, it is ensured that the environment is free of vibration and external force interference.

[0048] In step S6, after the installation is completed, a comprehensive inspection is performed to ensure that all connection parts are tight and there is no air leakage. In step S6, the bonding and curing of the graphite paper are observed. In step S6, the tar will condense on the graphite paper, accumulate and thicken continuously, and the tar accumulated on the surface of the graphite paper will automatically fall off when it reaches a critical weight.

[0049] Example 2

[0050] The present invention provides a method for self-cleaning and removing tar from graphite paper, which specifically comprises the following steps:

[0051] Step S1, selecting graphite paper with excellent thermal conductivity and chemical stability, ensuring that its thickness is uniform and the surface is flat;

[0052] Step S2, using the high temperature resistant inorganic silicate modified solution as a base material, mixing yttrium oxide, lanthanum oxide, cerium oxide and zirconium powder in a certain proportion to obtain a mixture, and fully stirring the mixture with the inorganic silicate modified solution until a uniform high temperature resistant binder is formed;

[0053] Step S3, cleaning the inner wall of the dust collector and its auxiliary equipment to ensure that the surface is free of oil, dust and other impurities;

[0054] Step S4, evenly coating the mixed high temperature resistant adhesive on the inner wall of the cyclone dust collector, and immediately attaching the graphite paper after coating the high temperature resistant adhesive;

[0055] Step S5, performing a curing process after attaching the graphite paper;

[0056] Step S6, setting a slag discharge port on the cyclone dust collector, and connecting a spiral slag discharger to the lower part of the cyclone dust collector.

[0057] In step S1, ensure that the specification of the graphite paper meets the required coverage area, and select graphite paper with a thickness of 0.3 mm.

[0058] In step S3, the metal surface is sandblasted or polished to ensure the adhesion of the high temperature resistant adhesive.

[0059] In step S4, the coating thickness should be controlled at 0.2 mm;

[0060] After attaching the graphite paper, use a roller to gently press the graphite paper so that the graphite paper is fully in contact with the high temperature resistant adhesive.

[0061] In step S5, curing is performed at a temperature of 350° C. and the film is left to stand for more than 24 hours after curing. During the curing process, it is ensured that the environment is free of vibration and external force interference.

[0062] In step S6, after the installation is completed, a comprehensive inspection is performed to ensure that all connection parts are tight and there is no air leakage. In step S6, the bonding and curing of the graphite paper are observed. In step S6, the tar will condense on the graphite paper, accumulate and thicken continuously, and the tar accumulated on the surface of the graphite paper will automatically fall off when it reaches a critical weight.

[0063] Example 3

[0064] The present invention provides a method for self-cleaning and removing tar from graphite paper, which specifically comprises the following steps:

[0065] Step S1, selecting graphite paper with excellent thermal conductivity and chemical stability, ensuring that its thickness is uniform and the surface is flat;

[0066] Step S2, using the high temperature resistant inorganic silicate modified solution as a base material, mixing yttrium oxide, lanthanum oxide, cerium oxide and zirconium powder in a certain proportion to obtain a mixture, and fully stirring the mixture with the inorganic silicate modified solution until a uniform high temperature resistant binder is formed;

[0067] Step S3, cleaning the inner wall of the dust collector and its auxiliary equipment to ensure that the surface is free of oil, dust and other impurities;

[0068] Step S4, evenly coating the mixed high temperature resistant adhesive on the inner wall of the cyclone dust collector, and immediately attaching the graphite paper after coating the high temperature resistant adhesive;

[0069] Step S5, performing a curing process after attaching the graphite paper;

[0070] Step S6, setting a slag discharge port on the cyclone dust collector, and connecting a spiral slag discharger to the lower part of the cyclone dust collector.

[0071] In step S1, ensure that the specification of the graphite paper meets the required coverage area, and select graphite paper with a thickness of 0.5 mm.

[0072] In step S3, the metal surface is sandblasted or polished to ensure the adhesion of the high temperature resistant adhesive.

[0073] In step S4, the coating thickness should be controlled at 0.3 mm;

[0074] After attaching the graphite paper, use a roller to gently press the graphite paper so that the graphite paper is fully in contact with the high temperature resistant adhesive.

[0075] In step S5, curing is performed at a temperature of 500° C. and the cured product is left to stand for more than 24 hours. During the curing process, it is ensured that the environment is free of vibration and external force interference.

[0076] In step S6, after the installation is completed, a comprehensive inspection is performed to ensure that all connection parts are tight and there is no air leakage. In step S6, the bonding and curing of the graphite paper are observed. In step S6, the tar will condense on the graphite paper, accumulate and thicken continuously, and the tar accumulated on the surface of the graphite paper will automatically fall off when it reaches a critical weight.

[0077] In the above-mentioned embodiments 1, 2 and 3, Figure 1 and Figure 2 , Figure 1 Marks 1, 2, 3, 4 and 5 correspond to the gas outlet pipe, the outer wall of the cyclone dust collector, the inner wall of the cyclone dust collector, the graphite paper and the slag outlet, respectively; Figure 2 Marks 1, 2, 3, 4, 5 and 6 correspond to the gas outlet pipe, the outer wall of the cyclone dust collector, the inner wall of the cyclone dust collector, the graphite paper, the graphite paper that falls off after layered adsorption and the slag outlet, respectively.

[0078] During actual operation Figure 2 As shown, the falling of graphite paper in the upper main contact area indicates that it has fallen due to its own weight, and the lighter color indicates that layered peeling has occurred; the darker color of the middle graphite paper indicates effective adsorption; the adsorption amount of the lower graphite paper is small, without major changes, and it is durable. The curled-up graphite paper at the bottom indicates that it has fallen after adsorption, and its size is large and irregular, ensuring enhanced separation effect. The slag unloading position should be cleaned regularly to prevent excessive accumulation of tar and carbon powder mixture, ensuring long-term stable operation of the system.

[0079] Experimental results and analysis

[0080] Example 1

[0081] Tar condensation and shedding: The cyclone dust collector was applied to the waste gas treatment system containing tar. After 72 hours of operation, it was observed that tar began to condense and gradually accumulate on the surface of the graphite paper. After 120 hours of operation, the tar accumulated on the surface of the graphite paper reached a critical weight and began to fall off automatically. The tar that fell off was smoothly discharged through the spiral slag discharger. According to statistics, during these 120 hours, the efficiency of graphite paper in effectively capturing tar reached 90%, and there was no significant increase in airflow resistance or equipment operation failure due to tar adhesion.

[0082] Changes in graphite paper performance: The thermal conductivity and chemical stability of graphite paper were tested before and after the experiment. In terms of thermal conductivity, the thermal conductivity of graphite paper was 1500W / (m·K) before the experiment and 1425W / (m·K) after the experiment, indicating that the adhesion and shedding process of tar has little effect on the thermal conductivity of graphite paper.

[0083] Example 2

[0084] Tar condensation and shedding: The cyclone dust collector was applied to the waste gas treatment system containing tar. After 60 hours of operation, it was observed that tar began to condense and gradually accumulate on the surface of the graphite paper. After 100 hours of operation, the tar accumulated on the surface of the graphite paper reached a critical weight and began to fall off automatically. The tar that fell off was smoothly discharged through the spiral slag discharger. According to statistics, during these 100 hours, the efficiency of graphite paper in effectively capturing tar reached 94%, and there was no significant increase in airflow resistance or equipment operation failure due to tar adhesion.

[0085] Changes in graphite paper performance: The thermal conductivity and chemical stability of graphite paper were tested before and after the experiment. In terms of thermal conductivity, the thermal conductivity of graphite paper was 1500W / (m·K) before the experiment and 1465W / (m·K) after the experiment, indicating that the adhesion and shedding process of tar has little effect on the thermal conductivity of graphite paper.

[0086] Example 3

[0087] Tar condensation and shedding: The cyclone dust collector was applied to the waste gas treatment system containing tar. After 80 hours of operation, it was observed that tar began to condense and gradually accumulate on the surface of the graphite paper. When it was operated for 130 hours, the tar accumulated on the surface of the graphite paper reached a critical weight and began to fall off automatically. The tar that fell off was smoothly discharged through the spiral slag discharger. According to statistics, during these 130 hours, the efficiency of graphite paper in effectively capturing tar reached 88%, and there was no significant increase in airflow resistance or equipment operation failure due to tar adhesion.

[0088] Changes in graphite paper performance: The thermal conductivity and chemical stability of graphite paper were tested before and after the experiment. In terms of thermal conductivity, the thermal conductivity of graphite paper was 1500W / (m·K) before the experiment and 1405W / (m·K) after the experiment, indicating that the adhesion and shedding process of tar has little effect on the thermal conductivity of graphite paper.

[0089] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0090] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for self-cleaning and removing tar from graphite paper, characterized in that: The steps include: Step S1, selecting graphite paper with excellent thermal conductivity and chemical stability, ensuring that its thickness is uniform and the surface is flat; Step S2, using the high temperature resistant inorganic silicate modified solution as a base material, mixing yttrium oxide, lanthanum oxide, cerium oxide and zirconium powder in a certain proportion to obtain a mixture, and fully stirring the mixture with the inorganic silicate modified solution until a uniform high temperature resistant binder is formed; Step S3, cleaning the inner wall of the dust collector and its auxiliary equipment to ensure that the surface is free of oil, dust and other impurities; Step S4, evenly coating the mixed high temperature resistant adhesive on the inner wall of the cyclone dust collector, and immediately attaching the graphite paper after coating the high temperature resistant adhesive; Step S5, performing a curing process after attaching the graphite paper; Step S6, setting a slag discharge port on the cyclone dust collector, and connecting a spiral slag discharger to the lower part of the cyclone dust collector.

2. A graphite paper self-cleaning and tar removal method according to claim 1, characterized in that: In step S1, ensure that the specification of the graphite paper meets the required coverage area, and select graphite paper with a thickness between 0.1-0.5 mm.

3. A graphite paper self-cleaning and tar removal method according to claim 1, characterized in that: In step S3, the metal surface is sandblasted or polished to ensure the adhesion of the high temperature resistant adhesive.

4. A graphite paper self-cleaning and tar removal method according to claim 1, characterized in that: In step S4, the coating thickness should be controlled between 0.1-0.3 mm; After attaching the graphite paper, use a roller to gently press the graphite paper so that the graphite paper is fully in contact with the high temperature resistant adhesive.

5. A graphite paper self-cleaning and tar removal method according to claim 1, characterized in that: In step S5, curing is performed at a temperature of about 200-500° C., and after curing, it is left to stand for more than 24 hours. During the curing process, it is ensured that the environment is free of vibration and external force interference.

6. A graphite paper self-cleaning and tar removal method according to claim 1, characterized in that: In step S6, a comprehensive inspection is performed after the installation is completed to ensure that all connection parts are tight and there is no air leakage.

7. A graphite paper self-cleaning and tar removal method according to claim 1, characterized in that: In step S6, the bonding and curing of the graphite paper are observed.

8. A graphite paper self-cleaning and tar removal method according to claim 1, characterized in that: In step S6, the tar will condense on the graphite paper, and will continue to accumulate and thicken. When the tar accumulated on the surface of the graphite paper reaches a critical weight, it will automatically fall off.

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