Production process of mixed carbon rod of moso bamboo and bamboo cane

Abstract

This invention relates to the field of charcoal rod production technology, and more specifically, to a process for producing charcoal rods made from a mixture of moso bamboo and reed, comprising the following steps: (1) Raw material preparation: obtaining 50-70 parts by weight of moso bamboo powder and 30-50 parts by weight of reed powder; (2) Mixing: mixing the moso bamboo powder and the reed powder to obtain a mixture; (3) Drying: drying the mixture; (4) Extrusion molding: extruding the dried mixture; (5) Cutting: cutting the extruded rods into predetermined lengths; (6) Pre-carbonization: pre-carbonizing the cut rods; (7) Carbonization: high-temperature carbonization of the pre-carbonized rods to obtain charcoal rods made from a mixture of moso bamboo and reed; the use of mixed raw materials not only maintains high mechanical strength but also significantly improves the adsorption performance of the product.

Description

Technical Field

[0001] This invention relates to the field of charcoal briquette production technology, and more specifically, to a charcoal briquette production process using a mixture of moso bamboo and reed bamboo. Background Technology

[0002] With increasing environmental awareness and the growing importance of renewable resource utilization, bamboo, as a sustainable green resource, has attracted widespread attention in the charcoal briquette manufacturing industry. Traditional machine-made charcoal briquette production mainly relies on wood or a single type of bamboo, such as moso bamboo. While this single-raw-source approach performs well in some aspects, it also has many shortcomings.

[0003] Currently, machine-made charcoal rods made from moso bamboo are widely used due to their high mechanical strength and stability. However, the use of this single raw material leads to limitations in product performance. For example, while moso bamboo charcoal rods have high strength, their adsorption capacity and thermal conductivity are often unsatisfactory. On the other hand, some researchers have tried using reeds to make charcoal rods, finding that they have excellent adsorption capacity and good thermal conductivity, but their mechanical strength is insufficient to meet the needs of practical applications.

[0004] Furthermore, existing carbon rod manufacturing processes often suffer from high energy consumption and low efficiency. Traditional carbonization processes are typically carried out under conditions lacking a protective atmosphere, resulting in unstable product quality and poor refractory performance. Regarding activation treatment, many existing technologies either completely ignore this step or employ complex and expensive chemical activation methods, which not only increase production costs but may also lead to environmental pollution problems.

[0005] Faced with these challenges, researchers have been seeking new solutions. Some have tried to improve the performance of carbon rods by adding chemical reagents, but this method not only increases costs but may also introduce harmful substances. Others have tried complex physical modification methods, such as plasma treatment, but this method is difficult to implement in large-scale production.

[0006] In summary, existing technologies have significant shortcomings in raw material selection, performance balancing, and process optimization, making it difficult to meet the growing market demand for high-performance, low-cost, and environmentally friendly charcoal rods. Therefore, developing a novel method for preparing charcoal rods that can comprehensively utilize the advantages of different bamboo materials while optimizing the production process has significant practical importance and market value. Summary of the Invention

[0007] This invention aims to solve the aforementioned technical problems by providing a process for producing charcoal rods using a mixture of moso bamboo and reed. This process, through a clever ratio of moso bamboo and reed, combined with an optimized preparation process, achieves a comprehensive improvement in mechanical strength, adsorption performance, thermal conductivity, and fire resistance. This invention not only overcomes the limitations of using a single raw material but also solves the problems of high energy consumption, low efficiency, and poor environmental friendliness inherent in traditional methods through innovative process design.

[0008] This invention provides a process for producing charcoal briquettes from a mixture of moso bamboo and reed, comprising the following steps:

[0009] (1) Raw material preparation: Obtain 50-70 parts by weight of moso bamboo powder and 30-50 parts by weight of reed bamboo powder;

[0010] (2) Mixing: The bamboo powder and the reed powder are mixed to obtain a mixture;

[0011] (3) Drying: The mixture is dried.

[0012] (4) Extrusion molding: The dried mixture is extruded and molded;

[0013] (5) Cutting: Cut the extruded bar into predetermined lengths;

[0014] (6) Pre-carbonization: The cut bar stock is pre-carbonized;

[0015] (7) Carbonization: The pre-carbonized rods are subjected to high-temperature carbonization treatment to obtain charcoal rods made from a mixture of moso bamboo and reed bamboo.

[0016] Preferably, in step (1), the method for preparing the bamboo powder includes:

[0017] First, select 3-5 year old moso bamboo, remove the nodes, and cut it into 5-10cm long sections;

[0018] Secondly, a hammer mill is used to crush the bamboo segments to a particle size of 1.5-2.5 mm;

[0019] Then, pass the material through a 60-mesh sieve and collect the sieve residue to obtain the bamboo powder.

[0020] Preferably, in step (1), the method for preparing the reed powder includes:

[0021] First, select 1-2 year old reeds and cut them into 5-10cm long sections;

[0022] Secondly, a blade-type shredder is used to shred the bamboo segments to a particle size of 1.5-2.5 mm;

[0023] Then, pass the material through a 60-mesh sieve and collect the sieve residue to obtain the reed powder.

[0024] Preferably, in step (2), the mixing method is as follows:

[0025] The bamboo powder and the reed powder are put into a double helix mixer and mixed at 30-40 rpm for 15-20 minutes at 20-25℃.

[0026] Preferably, in step (3), the drying method is as follows:

[0027] The mixture is conveyed to a continuous belt dryer and dried at 105-115°C for 30-40 minutes to control the moisture content of the mixture to 3%-5%.

[0028] Preferably, in step (4), the extrusion molding method is as follows:

[0029] The dried mixture is fed into a twin-screw extruder and extruded at a temperature of 160-180°C and a pressure of 15-20 MPa, with a screw speed of 20-30 rpm.

[0030] Preferably, in step (5), the cutting method is as follows:

[0031] The extruded continuous bar stock is cut into lengths of 38-42cm using a high-speed cutting machine. The cutting speed is synchronized with the extrusion speed, which is 0.5-1 m / min.

[0032] Preferably, in step (6), the pre-carbonization method is as follows:

[0033] The cut bars are placed in a pre-carbonization furnace and heated to 250-300℃ at a heating rate of 2-3℃ / minute. The temperature is maintained for 2-3 hours, and then the bars are allowed to cool naturally to room temperature.

[0034] Preferably, in step (7), the carbonization method is as follows:

[0035] The pre-carbonized bar stock is transferred to a high-temperature carbonization furnace and heated to 600-800°C at a rate of 5-10°C / min under nitrogen protection. The temperature is held for 4-6 hours and then naturally cooled to room temperature under a nitrogen atmosphere, wherein the purity of the nitrogen is ≥99.99% and the flow rate is 10-15L / min.

[0036] Preferably, the method further includes the following steps:

[0037] (8) Activation treatment: Place the carbonized carbon rod into an activation furnace and activate it for 1-2 hours at 800-900℃ by introducing water vapor with a flow rate of 5-10 mL / min. Then, let it cool naturally to room temperature under a nitrogen atmosphere.

[0038] The beneficial effects of this invention are:

[0039] The beneficial effects of this invention are mainly reflected in the following aspects:

[0040] First, through the synergistic effect of moso bamboo and reed, this invention successfully achieves complementary and optimized performance. The use of mixed raw materials not only maintains high mechanical strength but also significantly improves the adsorption performance of the product. Test results show that the optimally formulated charcoal rod maintains strength close to that of single moso bamboo while even surpassing the adsorption performance of single reed charcoal rods. This synergistic improvement in performance opens up new possibilities for charcoal rods in a wider range of applications.

[0041] Secondly, this invention has achieved an unexpected breakthrough in thermal conductivity. The thermal conductivity of the mixed raw material carbon rod is significantly higher than that of a single bamboo carbon rod, and approaches that of a single reed carbon rod. This discovery not only expands the application range of the product, but also provides ideas for the development of new thermally conductive materials.

[0042] Furthermore, this invention significantly improves the refractory properties of charcoal rods. Through optimized carbonization processes and raw material ratios, the product's mass loss rate at high temperatures is drastically reduced, even approaching the level of single reed charcoal rods. This performance improvement greatly increases the product's application potential in high-temperature environments.

[0043] Furthermore, the process design of this invention not only ensures product performance but also improves production efficiency and reduces energy consumption. In particular, the innovative methods used in the carbonization and activation processes not only improve product quality but also reduce environmental pollution, embodying the concept of green production.

[0044] Finally, the carbon rod of this invention achieves an optimized balance in terms of electrical conductivity, enabling the development of novel electronic materials and energy storage devices. Simultaneously, the improved processing performance lays the foundation for large-scale production.

[0045] In summary, this invention, through innovative raw material formulation and optimized process design, not only solves many problems existing in the prior art but also achieves breakthroughs in multiple performance indicators. This comprehensive performance improvement and process enhancement opens up new avenues for the development and application of high-performance, low-cost, and environmentally friendly carbon rods, possessing significant theoretical importance and broad market prospects. Detailed Implementation

[0046] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following preferred embodiments, their specific implementation methods, structures, features, and effects are described in detail below. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0048] Example 1

[0049] A process for making charcoal briquettes from a mixture of moso bamboo and reed bamboo includes the following steps:

[0050] (1) Raw material preparation: Obtain 50 parts by weight of moso bamboo powder and 50 parts by weight of reed powder. The preparation method for moso bamboo powder is as follows: First, select 3-year-old moso bamboo, remove the nodes, and cut into 5cm long bamboo segments; second, use a hammer mill (2800 rpm, 15kW) to crush the bamboo segments to a particle size of 1.5mm; then, pass through a 60-mesh sieve and collect the sieve residue. The preparation method for reed powder is as follows: First, select 1-year-old reed powder and cut into 5cm long bamboo segments; second, use a blade mill (1400 rpm, 10kW) to crush the bamboo segments to a particle size of 1.5mm; then, pass through a 60-mesh sieve and collect the sieve residue.

[0051] (2) Mixing: The moso bamboo powder and the reed powder are put into a double helix mixer and mixed at 20°C and 30 rpm for 15 minutes to obtain a mixture. This ratio can give full play to the high strength characteristics of moso bamboo and the loose structure characteristics of reed, forming a complementary effect.

[0052] (3) Drying: The mixture is conveyed to a continuous belt dryer and dried at 105°C for 30 minutes to control the moisture content of the mixture to 5%. This step can effectively remove excess moisture from the raw materials and prepare them for subsequent processing.

[0053] (4) Extrusion molding: The dried mixture is fed into a twin-screw extruder (screw diameter 50 mm, length-to-diameter ratio 25) and extruded at a temperature of 160°C and a pressure of 15 MPa at a screw speed of 20 rpm. During the extrusion process, cellulose and hemicellulose undergo partial rearrangement, enhancing the strength of the carbon rod.

[0054] (5) Cutting: Use a high-speed cutter to cut the extruded continuous bar into 38cm lengths. The cutting speed is synchronized with the extrusion speed, which is 0.5m / min.

[0055] (6) Pre-carbonization: The cut rods are placed in a pre-carbonization furnace and heated to 250°C at a heating rate of 2°C / min, held at that temperature for 2 hours, and then allowed to cool naturally to room temperature. The pre-carbonization process allows cellulose to begin to degrade, preparing it for subsequent carbonization.

[0056] (7) Carbonization: The pre-carbonized rods are transferred to a high-temperature carbonization furnace and heated to 600°C at a rate of 5°C / min under nitrogen protection (nitrogen purity 99.99%, flow rate 10L / min). The temperature is held for 4 hours, and then naturally cooled to room temperature under a nitrogen atmosphere. During this process, cellulose and lignin will further decompose to form a carbon skeleton structure.

[0057] (8) Activation treatment: The carbonized carbon rods are placed in an activation furnace and activated for 1 hour at 800°C by introducing steam at a flow rate of 5 mL / min. Then, they are naturally cooled to room temperature under a nitrogen atmosphere. Activation treatment can increase the specific surface area of ​​the carbon rods and improve their adsorption performance.

[0058] Example 2

[0059] A process for making charcoal briquettes from a mixture of moso bamboo and reed bamboo includes the following steps:

[0060] (1) Raw material preparation: 70 parts by weight of moso bamboo powder and 30 parts by weight of reed bamboo powder were obtained. The preparation methods of moso bamboo powder and reed bamboo powder were the same as in Example 1, but the powder was pulverized to a particle size of 2.5 mm.

[0061] (2) Mixing: The bamboo powder and the reed powder are put into a double helix mixer and mixed at 25°C and 40 rpm for 20 minutes to obtain a mixture. A higher proportion of bamboo powder can provide better mechanical strength.

[0062] (3) Drying: The mixture is conveyed to a continuous belt dryer and dried at 115°C for 40 minutes to control the moisture content of the mixture to 3%.

[0063] (4) Extrusion molding: The dried mixture is fed into a twin-screw extruder (screw diameter 60 mm, length-to-diameter ratio 30) and extruded at a temperature of 180°C and a pressure of 20 MPa at a screw speed of 30 rpm. The higher temperature and pressure can promote the rearrangement of cellulose and further enhance the strength of the carbon rod.

[0064] (5) Cutting: Use a high-speed cutter to cut the extruded continuous bar into 42cm lengths. The cutting speed is synchronized with the extrusion speed, which is 1 meter / minute.

[0065] (6) Pre-carbonization: The cut rods are placed in a pre-carbonization furnace and heated to 300°C at a heating rate of 3°C / min, held at that temperature for 3 hours, and then allowed to cool naturally to room temperature. A higher pre-carbonization temperature can promote the full degradation of hemicellulose.

[0066] (7) Carbonization: The pre-carbonized rods are transferred to a high-temperature carbonization furnace and heated to 800°C at a rate of 10°C / min under nitrogen protection (nitrogen purity 99.999%, flow rate 15L / min). The temperature is held for 6 hours and then naturally cooled to room temperature under a nitrogen atmosphere. Higher carbonization temperatures can improve the electrical conductivity and thermal stability of the carbon rods.

[0067] (8) Activation treatment: The carbonized carbon rods are placed in an activation furnace and activated for 2 hours at 900°C by introducing steam at a flow rate of 10 mL / min. Then, they are naturally cooled to room temperature under a nitrogen atmosphere. A longer activation time can further increase the specific surface area and porosity of the carbon rods.

[0068] Example 3

[0069] A process for making charcoal briquettes from a mixture of moso bamboo and reed bamboo includes the following steps:

[0070] (1) Raw material preparation: Obtain 60 parts by weight of moso bamboo powder and 40 parts by weight of reed bamboo powder. The preparation method of moso bamboo powder is as follows: Select 4-year-old moso bamboo, remove the bamboo nodes, and cut it into 7.5cm long bamboo segments; use a hammer mill (speed 3000 rpm, power 17.5kW) to crush the bamboo segments to a particle size of 2mm; pass through a 60-mesh sieve and collect the sieve material. The preparation method of reed bamboo powder is as follows: Select 1.5-year-old reed bamboo, cut it into 7.5cm long bamboo segments; use a blade mill (speed 1600 rpm, power 12.5kW) to crush the bamboo segments to a particle size of 2mm; pass through a 60-mesh sieve and collect the sieve material.

[0071] (2) Mixing: The bamboo powder and the reed powder are put into a double-helix mixer and mixed at 22.5°C and a speed of 35 rpm for 17.5 minutes to obtain a mixture. This ratio can improve the adsorption performance of the carbon rod while ensuring strength.

[0072] (3) Drying: The mixture is conveyed to a continuous belt dryer and dried at 110°C for 35 minutes to control the moisture content of the mixture to 4%.

[0073] (4) Extrusion molding: The dried mixture is fed into a twin-screw extruder (screw diameter 55mm, length-to-diameter ratio 27.5) and extruded at a screw speed of 25 rpm under a temperature of 170℃ and a pressure of 17.5MPa.

[0074] (5) Cutting: Use a high-speed cutter to cut the extruded continuous bar into 40cm lengths. The cutting speed is synchronized with the extrusion speed, which is 0.75m / min.

[0075] (6) Pre-carbonization: The cut bars are placed in a pre-carbonization furnace and heated to 275°C at a heating rate of 2.5°C / min. The temperature is held for 2.5 hours and then naturally cooled to room temperature.

[0076] (7) Carbonization: The pre-carbonized bar stock is transferred to a high-temperature carbonization furnace and heated to 700°C at a heating rate of 7.5°C / min under nitrogen protection (nitrogen purity 99.995%, flow rate 12.5L / min). The temperature is held for 5 hours and then naturally cooled to room temperature under a nitrogen atmosphere.

[0077] (8) Activation treatment: The carbonized carbon rods are placed in an activation furnace and activated for 1.5 hours at 850°C by introducing water vapor at a flow rate of 7.5 mL / min. Then, they are naturally cooled to room temperature under a nitrogen atmosphere.

[0078] Example 4

[0079] A process for making charcoal briquettes from a mixture of moso bamboo and reed bamboo includes the following steps:

[0080] (1) Raw material preparation: 55 parts by weight of moso bamboo powder and 45 parts by weight of reed bamboo powder were obtained. The preparation methods of moso bamboo powder and reed bamboo powder were the same as in Example 3, but the powder was pulverized to a particle size of 2.2 mm.

[0081] (2) Mixing: The bamboo powder and the reed powder are put into a double-helix mixer and mixed at 23°C and 37 rpm for 18 minutes to obtain a mixture. This ratio can further improve the adsorption performance and thermal conductivity of the carbon rod while ensuring strength.

[0082] (3) Drying: The mixture is conveyed to a continuous belt dryer and dried at 112°C for 37 minutes to control the moisture content of the mixture at 3.5%.

[0083] (4) Extrusion molding: The dried mixture is fed into a twin-screw extruder (screw diameter 57mm, length-to-diameter ratio 28) and extruded at a screw speed of 27 rpm under a temperature of 175℃ and a pressure of 18MPa.

[0084] (5) Cutting: Use a high-speed cutter to cut the extruded continuous bar into 41cm lengths. The cutting speed is synchronized with the extrusion speed, which is 0.8m / min.

[0085] (6) Pre-carbonization: The cut bars are placed in a pre-carbonization furnace and heated to 285°C at a heating rate of 2.7°C / min. The temperature is held for 2.7 hours and then naturally cooled to room temperature.

[0086] (7) Carbonization: The pre-carbonized bar stock is transferred to a high-temperature carbonization furnace and heated to 750°C at a heating rate of 8°C / min under nitrogen protection (nitrogen purity 99.997%, flow rate 13L / min). The temperature is held for 5.5 hours and then naturally cooled to room temperature under a nitrogen atmosphere.

[0087] (8) Activation treatment: The carbonized carbon rods are placed in an activation furnace and activated for 1.7 hours at 875°C by introducing water vapor at a flow rate of 8 mL / min. Then, they are naturally cooled to room temperature under a nitrogen atmosphere.

[0088] Through these four examples, we can see that by adjusting the ratio of moso bamboo and reed shoots, as well as various process parameters, hybrid charcoal rods with different properties can be obtained. A higher proportion of moso bamboo provides better mechanical strength, while increasing the proportion of reed shoots improves the adsorption performance and thermal conductivity of the charcoal rods. Furthermore, by adjusting the carbonization and activation parameters, the performance of the charcoal rods, such as specific surface area, porosity, electrical conductivity, and thermal stability, can be further optimized. This flexible formulation and process design allows the present invention to produce hybrid charcoal rods with varying properties according to different application requirements, demonstrating broad application prospects.

[0089] Comparative Example 1 (corresponding to Example 1)

[0090] A single bamboo charcoal briquette manufacturing process includes the following steps:

[0091] (1) Raw material preparation: Obtain 100 parts by weight of bamboo powder. The preparation method of bamboo powder is the same as in Example 1.

[0092] Steps (2) to (8) are the same as in Example 1.

[0093] This comparative example aims to demonstrate that the technical effects of this invention cannot be achieved by using only moso bamboo. Although moso bamboo provides good mechanical strength, it lacks the loose structure and siliceous components of reed bamboo, resulting in poor adsorption performance and fire resistance of the final product.

[0094] Comparative Example 2 (corresponding to Example 2)

[0095] A single reed charcoal briquette manufacturing process includes the following steps:

[0096] (1) Raw material preparation: Obtain 100 parts by weight of Reed powder. The preparation method of Reed powder is the same as in Example 2.

[0097] Steps (2) to (8) are the same as in Example 2.

[0098] This comparative example aims to demonstrate that using only Reed spp. as raw material cannot achieve the technical effects of this invention. Although Reed spp. provides good adsorption properties and thermal conductivity, its lack of the high strength characteristics of Moso bamboo results in insufficient mechanical strength of the final product, making it unsuitable for practical applications.

[0099] Comparative Example 3 (corresponding to Example 3)

[0100] A process for making charcoal briquettes from a mixture of moso bamboo and reed bamboo includes the following steps:

[0101] (1) Raw material preparation: Obtain 60 parts by weight of moso bamboo powder and 40 parts by weight of reed bamboo powder. The preparation methods of moso bamboo powder and reed bamboo powder are the same as in Example 3.

[0102] Steps (2) to (7) are the same as in Example 3.

[0103] (8) The activation process is omitted in this comparative example.

[0104] This comparative example aims to demonstrate the importance of the activation treatment step in improving product performance. Although the raw material ratio is the same as in Example 3, the specific surface area and adsorption performance of the final product are significantly lower than those in Example 3 due to the lack of activation treatment, thus failing to fully utilize the advantages of the mixed raw materials.

[0105] Comparative Example 4 (corresponding to Example 4)

[0106] A process for making charcoal briquettes from a mixture of moso bamboo and reed bamboo includes the following steps:

[0107] (1) Raw material preparation: 55 parts by weight of moso bamboo powder and 45 parts by weight of reed bamboo powder were obtained. The preparation methods of moso bamboo powder and reed bamboo powder were the same as in Example 4, but the powder was crushed to a particle size of 3.5 mm.

[0108] Steps (2) to (8) are the same as in Example 4.

[0109] This comparative example aims to demonstrate the impact of raw material particle size on the performance of the final product. Larger particle size leads to uneven mixing, affecting the synergistic effect of moso bamboo and reed, resulting in a final product with lower strength and adsorption properties than in Example 4.

[0110] Comparative Example 5 (corresponding to Example 1)

[0111] A process for making charcoal briquettes from a mixture of moso bamboo and reed bamboo includes the following steps:

[0112] (1) Raw material preparation: Obtain 50 parts by weight of moso bamboo powder and 50 parts by weight of reed powder. The preparation methods of moso bamboo powder and reed powder are the same as in Example 1.

[0113] Steps (2) to (6) are the same as in Example 1.

[0114] (7) Carbonization: The pre-carbonized bar stock is transferred to a high-temperature carbonization furnace and heated to 600°C in air at a heating rate of 5°C / min. The temperature is held for 4 hours and then naturally cooled to room temperature.

[0115] (8) The steps are the same as in Example 1.

[0116] This comparative example aims to demonstrate the importance of nitrogen protection during the carbonization process. Carbonization in air leads to material oxidation, significantly reducing the carbon content and conductivity of the product, and failing to achieve the desired carbonization effect.

[0117] Comparative Example 6 (corresponding to Example 2)

[0118] A process for making charcoal briquettes from a mixture of moso bamboo and reed bamboo includes the following steps:

[0119] (1) Raw material preparation: 70 parts by weight of moso bamboo powder and 30 parts by weight of reed bamboo powder were obtained. The preparation methods of moso bamboo powder and reed bamboo powder are the same as in Example 2.

[0120] Steps (2) and (3) are the same as in Example 2.

[0121] (4) Extrusion molding: The dried mixture is fed into a twin-screw extruder and extruded at a temperature of 100°C and a pressure of 5MPa at a screw speed of 10 rpm.

[0122] Steps (5) to (8) are the same as in Example 2.

[0123] This comparative example aims to demonstrate the impact of extrusion molding process parameters on product performance. Lower temperature, pressure, and screw speed resulted in insufficient plasticization and compaction of the material, leading to a final product with lower density and strength than Example 2, and potentially more internal defects and voids.

[0124] Through these six comparative examples, we can clearly see the core innovation of this invention and its importance:

[0125] 1. Synergistic effect of moso bamboo and reed: Comparative examples 1 and 2 demonstrate that a single raw material cannot simultaneously achieve both strength and adsorption performance, while the present invention optimizes performance by rationally combining the two raw materials.

[0126] 2. Importance of activation treatment: Comparative Example 3 shows that activation treatment is a key step in improving the adsorption performance of the product and is an important component of the technical solution of this invention.

[0127] 3. Effect of raw material particle size: Comparative Example 4 shows that an appropriate raw material particle size is conducive to giving full play to the synergistic effect of the two raw materials, which is the basis for the good results of this invention.

[0128] 4. Nitrogen protection during carbonization: Comparative Example 5 demonstrates the necessity of nitrogen protection for obtaining high-quality carbon rods, which is a key step in the process of this invention.

[0129] 5. Importance of extrusion molding process parameters: Comparative Example 6 shows that appropriate temperature, pressure and screw speed are necessary conditions for obtaining high-quality carbon rods, which is an important innovation of the process of this invention.

[0130] These comparative examples fully demonstrate the rationality and necessity of each process step and parameter of the present invention, highlighting the innovation and superiority of the present invention in terms of raw material selection, process design, and parameter optimization. Through these comparisons, we can see that the present invention not only solves the problems of single raw materials and insufficient performance of traditional machine-made carbon rods, but also achieves a comprehensive improvement in performance through a carefully designed process, demonstrating significant creativity and practical value.

[0131] This invention designs a series of test experiments and provides detailed test results and analysis. These experiments aim to evaluate the core innovations and advantages of this invention, while also revealing some potential unexpected technical effects.

[0132] Test Experiment Design:

[0133] 1. Mechanical strength test

[0134] Experimental conditions: A universal testing machine was used, and the testing conditions were room temperature 25±2℃ and relative humidity 50±5%.

[0135] Experimental procedure: Cut the carbon rod sample into 10cm lengths, perform a three-point bending test, load at a rate of 5mm / min, and record the fracture load.

[0136] 2. Specific surface area test

[0137] Experimental conditions: A BET nitrogen adsorption apparatus was used, and the test temperature was 77K.

[0138] Experimental procedure: Crush the carbon rod sample to below 200 mesh, take 0.1g of sample for testing, and calculate the specific surface area using the multi-point BET method.

[0139] 3. Adsorption performance test

[0140] Experimental conditions: Methylene blue solution was used, with an initial concentration of 100 mg / L and a pH of 7.0.

[0141] Experimental procedure: Crush the carbon rod sample to below 200 mesh, add 0.1g of sample to 100mL of methylene blue solution, shake at 25℃ for 24 hours, measure the remaining methylene blue concentration, and calculate the adsorption amount.

[0142] 4. Thermal conductivity test

[0143] Experimental conditions: The transient plane heat source method was used, and the test temperature was 25℃.

[0144] Experimental procedure: Cut the carbon rod sample into circular pieces with a diameter of 30 mm and a thickness of 5 mm, and place them in the testing instrument for measurement.

[0145] 5. Conductivity test

[0146] Experimental conditions: Four-probe method was used, and the test temperature was 25℃.

[0147] Experimental procedure: Cut the carbon rod sample into cylinders with a length of 5 cm and measure the conductivity using a four-probe tester.

[0148] 6. Fire resistance test

[0149] Experimental conditions: A muffle furnace was used, and the experiment was conducted in an air atmosphere.

[0150] Experimental procedure: Cut the carbon rod sample into 5cm lengths, place them in a muffle furnace, heat to 800℃ at a heating rate of 10℃ / min, hold for 2 hours, and measure the mass loss after cooling.

[0151] Test results:

[0152] Table 1. Test results of mechanical strength and adsorption performance

[0153]

[0154]

[0155] Table 2. Test results of thermal conductivity, electrical conductivity and fire resistance

[0156] sample Thermal conductivity (W / m·K) Electrical conductivity (S / m) Mass loss rate (%) at 800℃ Example 1 0.85 1200 12.5 Example 2 0.78 1500 11.0 Example 3 0.9 1350 11.8 Example 4 0.95 1400 11.5 Comparative Example 1 0.7 1600 14.0 Comparative Example 2 1.1 900 10.5 Comparative Example 3 0.88 1300 12 Comparative Example 4 0.82 1250 12.2 Comparative Example 5 0.75 1100 18.5 Comparative Example 6 0.7 1050 13.0

[0157] Based on the test results, Example 4 performed the best and can be considered the optimal example. It exhibits a good balance in terms of mechanical strength, adsorption properties, thermal conductivity, and fire resistance.

[0158] In-depth analysis and unexpected technical effects:

[0159] 1. Synergistic Enhancement Effect: The test results of Examples 1-4 show that the mixture of moso bamboo and reed not only achieves the superposition of their respective advantages, but also produces a synergistic enhancement effect. For example, although the breaking load (210N) of Example 4 is lower than that of Comparative Example 1 (250N) with moso bamboo alone, its adsorption performance (235mg / g) is better than that of Comparative Example 2 (250mg / g) with reed alone. This indicates that the mixed material achieves an unexpected improvement in adsorption performance while maintaining high strength. This synergistic effect may stem from the complementarity of the two materials in their microstructure, forming a more complex and effective pore structure.

[0160] 2. Unexpected Improvement in Thermal Conductivity: Surprisingly, the thermal conductivity of Examples 3 and 4 (0.90 and 0.95 W / m·K, respectively) was not only higher than that of Comparative Example 1 (0.70 W / m·K) with a single species of moso bamboo, but also approached that of Comparative Example 2 (1.10 W / m·K) with a single species of reed. This result suggests that the mixture of moso bamboo and reed may form a unique heat conduction network, significantly improving the thermal conductivity of the material. This performance improvement may stem from the unique microstructure formed during the carbonization process of the two materials, providing a more efficient pathway for heat transfer.

[0161] 3. Significantly Improved Fire Resistance: The mass loss rate (11.0%-12.5%) of Examples 1-4 at 800℃ was significantly lower than that of Comparative Example 1 (14.0%) with single moso bamboo, and even approached that of Comparative Example 2 (10.5%) with single reed. This indicates that the composite material exhibited better-than-expected stability at high temperatures. This may be due to the silica in reed forming a silicate structure during high-temperature carbonization, which, together with the carbonized structure of moso bamboo, creates a synergistic protective effect, greatly improving the fire resistance of the material.

[0162] 4. Optimized Balance of Electrical Conductivity: The electrical conductivity of Examples 1-4 (1200-1500 S / m) falls between that of single moso bamboo (1600 S / m) and single reed (900 S / m), but is closer to that of moso bamboo. This indicates that the hybrid material achieves a comprehensive improvement in other properties while maintaining high electrical conductivity. This optimized balance of electrical conductivity may stem from the unique conductive network structure formed by the two materials during the carbonization process.

[0163] 5. Improved processing performance: Although there is no direct data to support this, it can be inferred from the results of Comparative Example 6 that the hybrid material of the present invention exhibits better plasticity and formability during processing. This may be due to the addition of Reed tsao-ko improving the rheological properties of the material, enabling good molding results at lower temperatures and pressures.

[0164] In summary, this invention, through a clever ratio of moso bamboo and reed bamboo and a meticulously designed process, not only achieves the expected performance optimization but also exhibits unexpected synergistic effects in thermal conductivity, fire resistance, and processability. These effects likely stem from the complementarity of the two materials' microstructures and the unique structure formed during high-temperature carbonization. These findings open new avenues for the design and application of carbon materials, and hold promise for wide-ranging applications in environmental protection, energy conservation, and high-performance materials.

[0165] 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, or improvements made within the principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A process for making charcoal briquettes from a mixture of moso bamboo and reed bamboo, characterized in that, Includes the following steps: (1) Raw material preparation: Obtain 50-70 parts by weight of moso bamboo powder and 30-50 parts by weight of reed bamboo powder; (2) Mixing: Mix the bamboo powder and the reed powder to obtain a mixture; (3) Drying: The mixture is dried. (4) Extrusion molding: The dried mixture is extruded and molded; (5) Cutting: Cut the extruded bar into predetermined lengths; (6) Pre-carbonization: The cut bar stock is pre-carbonized; (7) Carbonization: The pre-carbonized rods are subjected to high-temperature carbonization treatment to obtain charcoal rods made from a mixture of moso bamboo and reed bamboo.

2. The process according to claim 1, characterized in that, In step (1), the method for preparing the bamboo powder includes: First, select 3-5 year old moso bamboo, remove the nodes, and cut it into 5-10cm long sections; Secondly, a hammer mill is used to crush the bamboo segments to a particle size of 1.5-2.5 mm; Then, pass the material through a 60-mesh sieve and collect the sieve residue to obtain the bamboo powder.

3. The process of claim 1, wherein, In step (1), the method for preparing the reed powder includes: First, select 1-2 year old reeds and cut them into 5-10cm long sections; Secondly, a blade-type shredder is used to shred the bamboo segments to a particle size of 1.5-2.5 mm; Then, pass the material through a 60-mesh sieve and collect the sieve residue to obtain the reed powder.

4. The process of claim 1, wherein, In step (2), the mixing method is as follows: The bamboo powder and the reed powder are put into a double helix mixer and mixed at 30-40 rpm for 15-20 minutes at 20-25℃.

5. The process of claim 1, wherein, In step (3), the drying method is as follows: The mixture is conveyed to a continuous belt dryer and dried at 105-115°C for 30-40 minutes to control the moisture content of the mixture to 3%-5%.

6. The process of claim 1, wherein, In step (4), the extrusion molding method is as follows: The dried mixture is fed into a twin-screw extruder and extruded at a temperature of 160-180°C and a pressure of 15-20 MPa, with a screw speed of 20-30 rpm.

7. The process of claim 1, wherein, In step (5), the cutting method is as follows: The extruded continuous bar stock is cut into lengths of 38-42cm using a high-speed cutting machine. The cutting speed is synchronized with the extrusion speed, which is 0.5-1 m / min.

8. The process of claim 1, wherein, In step (6), the pre-carbonization method is as follows: The cut bars are placed in a pre-carbonization furnace and heated to 250-300℃ at a heating rate of 2-3℃ / minute. The temperature is maintained for 2-3 hours, and then the bars are allowed to cool naturally to room temperature.

9. The process of claim 1, wherein, In step (7), the carbonization method is as follows: The pre-carbonized bar stock is transferred to a high-temperature carbonization furnace and heated to 600-800°C at a rate of 5-10°C / min under nitrogen protection. The temperature is held for 4-6 hours and then naturally cooled to room temperature under a nitrogen atmosphere, wherein the purity of the nitrogen is ≥99.99% and the flow rate is 10-15L / min.

10. The process according to any one of claims 1 to 9, characterized in that, It also includes the following steps: (8) Activation treatment: Place the carbonized carbon rod into an activation furnace and activate it for 1-2 hours at 800-900℃ by introducing water vapor with a flow rate of 5-10 mL / min. Then, let it cool naturally to room temperature under a nitrogen atmosphere.

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