Clean production process for producing charcoal from bamboo sawdust and co-producing biomass pyrolysis by-products

Abstract

The invention relates to the technical field of biomass resource utilization, and discloses a clean production process for preparing charcoal from bamboo sawdust and co-producing biomass pyrolysis by-products, which sequentially comprises the steps of raw material pretreatment, firewood rod forming, high-temperature carbonization, flue gas resource and environment-friendly treatment and finished product treatment. The technical problems of low raw material utilization rate, high energy consumption, low pollutant emission and low additional value of byproducts in the prior art are solved by optimizing the raw material treatment flow, strengthening the regulation and control of the carbonization process and efficiently recovering flue gas waste heat and pyrolysis byproducts. Raw material refining treatment is achieved through laser particle size detection and PLC linkage control, flue gas waste heat is recycled through the fin type heat exchanger, the quality of bamboo charcoal and by-products is optimized in combination with the temperature-flow linkage regulation and control technology, the raw material utilization rate is increased, the energy consumption cost is reduced, and standard emission of pollutants is achieved; the economic and environmental benefits of resource utilization of the bamboo sawdust are obviously improved.

Description

Technical Field

[0001] This invention relates to the field of biomass resource utilization technology, specifically a clean production process for the co-production of bamboo shavings charcoal and biomass pyrolysis byproducts. Background Technology

[0002] Bamboo shavings, a waste product generated during bamboo processing, are abundant in resources. Through high-temperature carbonization, they can be transformed into bamboo charcoal with high adsorption properties, while simultaneously producing pyrolysis byproducts such as wood vinegar, wood tar, and combustible gases, demonstrating significant economic and environmental value. However, existing bamboo shavings charcoal production and byproduct treatment processes still suffer from numerous technical shortcomings: Poor raw material processing: bamboo chips contain many impurities and have uneven particle size. Traditional screening and crushing processes rely on manual control, resulting in a raw material utilization rate of only about 85%. Furthermore, the subsequently formed firewood sticks are prone to cracking, affecting the stability of carbonization. High energy consumption costs: The flue gas generated during the carbonization process reaches a temperature of 150-200℃, which directly enters the condensation system, causing a large amount of waste heat to be lost. The drying process requires additional external energy such as electricity or gas, and the energy consumption cost accounts for more than 30%. Environmental issues are prominent: the flue gas contains acidic gases ( If particulate matter is not thoroughly purified and is directly emitted, it can easily cause environmental pollution. Low added value of by-products: Wood vinegar and wood tar have low content of effective components (such as acetic acid and light tar) due to untimely collection or crude purification processes, making it difficult to fully realize their economic value.

[0003] Therefore, developing a clean production process for bamboo shavings charcoal production and pyrolysis by-product co-production with high raw material utilization, low energy consumption, environmental compliance, and high added value of by-products has become an urgent technical problem to be solved. Summary of the Invention

[0004] (a) Technical problems to be solved To address the shortcomings of existing technologies, this invention provides a clean production process for the co-production of bamboo shavings charcoal and biomass pyrolysis byproducts. This process achieves efficient resource utilization of bamboo shavings, reduces production energy consumption, decreases pollutant emissions, and increases the added value of pyrolysis byproducts.

[0005] (II) Technical Solution To achieve the above objectives, the present invention provides the following technical solution: a clean production process for the co-production of bamboo shavings charcoal and biomass pyrolysis by-products, comprising the following steps: S1. Raw material pretreatment: Bamboo shavings are dried with hot air at 160-250℃ to a moisture content of 6%-12%. The dried bamboo shavings are first subjected to primary crushing, and the coarse material separated by sieving is returned to secondary crushing. At the same time, metal impurities are removed by magnetic separation. A laser particle size analyzer is installed between the primary crushing and sieving. The secondary crushing adopts a frequency converter and is controlled by a PLC control system to ensure that the proportion of bamboo powder with a particle size ≤1mm is ≥95%. S2. Bamboo stick forming: The pretreated bamboo powder is fed into the forming machine, the forming cylinder temperature is controlled, and the forming temperature is adjusted to 260-320℃ according to the moisture content of the bamboo powder. The bamboo powder is then extruded into dense and smooth bamboo sticks. S3. High-temperature carbonization: The fuel briquettes are fed into the carbonization kiln and fired at high temperature through the control system, transforming the fuel briquettes into high-temperature bamboo charcoal with well-developed pores and good adsorption properties; 3 sets of thermocouples are installed in the carbonization kiln to monitor the carbonization temperature in real time. S4. Flue Gas Resource Utilization and Environmental Protection: The flue gas generated during carbonization is first separated by a cyclone separator to recover uncarbonized bamboo shavings and return them to the raw material processing stage for reuse; the residual gas is then treated sequentially by water mist dust removal, bag filter + settling chamber dust removal, and electrostatic dust removal, before entering a condenser to separate wood tar and wood vinegar; after purification, the flue gas recovers residual heat through a finned heat exchanger to preheat the cold air for use in the bamboo shavings drying process in step 1; the remaining combustible gas is used as auxiliary fuel for the drying and carbonization processes; a variable frequency induced draft fan is installed at the flue gas outlet, controlled by temperature-flow linkage: when the carbonization temperature is 500-600℃, the fan flow rate is adjusted to 1200 m³ / h. To enhance the collection of wood vinegar; when the carbonization temperature is 700-1000℃, the air volume of the induced draft fan should be adjusted to 800. To optimize the quality of wood tar and bamboo charcoal; S5. Finished product processing: Cool the high-temperature bamboo charcoal to room temperature, screen it, and pack it into boxes; the recovered wood tar and wood vinegar are purified, graded, and packaged separately.

[0006] Furthermore, in S1, the speed adjustment range of the variable frequency pulverizer is 500-1500 r / min.

[0007] Furthermore, in step S2, the temperature of the forming cylinder is controlled to be 340-350℃.

[0008] Furthermore, in S3, the high-temperature carbonization temperature range of the carbonization kiln is 500-1000℃.

[0009] Furthermore, in S4, the preheating temperature of the cold air is 80-100℃.

[0010] Furthermore, in S4, the heat exchange area of ​​the finned heat exchanger is 50. It is used to transfer the residual heat of flue gas at 150-200℃ to cold air.

[0011] Furthermore, in step S4, the separated wood tar is used as a raw material for coatings.

[0012] Furthermore, in step S4, the separated wood vinegar is used as an agricultural antibacterial agent.

[0013] (iii) Beneficial technical effects This invention employs a refined processing technology combining primary crushing, laser particle size detection, and PLC-linked secondary crushing. This, combined with magnetic separation for impurity removal and cyclone gas-material separation for recovering uncarbonized particles, ensures that bamboo powder with a particle size ≤1mm consistently accounts for ≥95%, improving raw material utilization and significantly reducing resource waste. A three-stage purification process—water mist dust removal, bag filter, settling chamber dust removal, and electrostatic dust removal—deeply removes particulate matter from flue gas, resulting in low emission concentrations and emissions that meet environmental protection requirements. Furthermore, the process fully recovers and purifies pyrolysis byproducts such as wood tar and wood vinegar, avoiding soil and water pollution caused by the indiscriminate discharge of byproducts in traditional processes, thus achieving clean production. The quality of bamboo charcoal is significantly optimized: the high-temperature precision carbonization process of this invention results in bamboo charcoal with well-developed pores and a specific surface area of ​​820-980. / g, with excellent adsorption performance. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] A clean production process for the co-production of bamboo shavings charcoal and biomass pyrolysis byproducts, characterized by comprising the following steps: Raw material pretreatment: First, the bamboo shavings are dried with hot air at 160-250℃, controlling the moisture content to 6%-12%. After drying, the bamboo shavings undergo primary crushing. The particle size distribution of the crushed bamboo powder is monitored in real time using a laser particle size analyzer. Coarse material with a particle size greater than 1mm is returned to the secondary crushing process. The secondary crushing uses a variable frequency crusher with an adjustable speed within the range of 500-1500r / min. The PLC control system links the laser particle size detection with the crusher speed to ensure that the proportion of bamboo powder with a particle size ≤1mm is ≥95%. At the same time, a magnetic separation process is used to remove metal impurities from the bamboo shavings to avoid affecting the operation of subsequent equipment and product quality. Firewood rod forming: The pretreated bamboo powder is fed into the forming machine. The forming cylinder temperature is fixed at 340-350℃. The forming temperature is dynamically adjusted to 260-320℃ according to the actual moisture content of the bamboo powder. The firewood rods with high density and smooth surface are made by spiral extrusion. High-temperature carbonization: The fuel briquettes are fed into the carbonization kiln, which is equipped with three sets of thermocouples to monitor the carbonization temperature of different areas in real time. The control system precisely regulates the firing process so that the fuel briquettes can be carbonized at high temperatures within the range of 500-1000℃, transforming them into high-temperature bamboo charcoal with well-developed pores and excellent adsorption properties. The flue gas containing combustible gases, tar and other components generated during the carbonization process is introduced into the subsequent resource utilization system. Flue gas resource utilization and environmental protection treatment: Gas-material separation: The flue gas first passes through a cyclone gas-material separation device to recover the uncarbonized bamboo shavings particles, which are then returned to the raw material pretreatment stage for reuse, thereby improving the utilization rate of raw materials; Multi-stage dust removal: The residual gas passes through three stages of treatment in sequence: water mist dust removal, bag filter + settling chamber dust removal and electrostatic dust removal, which deeply removes particulate matter in the flue gas and avoids pollutant emissions; Waste heat recovery: After flue gas purification, a heat exchanger with a surface area of ​​50 mm is installed. The finned heat exchanger transfers the waste heat of the flue gas at 150-200℃ to the cold air, preheats the cold air to 80-100℃ and then uses it in the bamboo chip drying process, complementing the original heating system and reducing external energy consumption. By-product separation: The flue gas after waste heat recovery enters the condensation equipment to separate wood tar and wood vinegar. Wood tar can be used as a raw material for coatings, and wood vinegar can be used as an agricultural antibacterial agent. Gas recovery: The combustible gas remaining after condensation and separation is collected and used as auxiliary fuel in the drying and carbonization processes, realizing the recycling of energy; Interlocking Control: A variable frequency induced draft fan is installed at the flue gas outlet. Based on the temperature data monitored by thermocouples inside the carbonization kiln, the fan volume is controlled via temperature-flow linkage: when the carbonization temperature is 500-600℃, the air volume is adjusted to 1200. To enhance the collection efficiency of wood vinegar; when the carbonization temperature is 700-1000℃, adjust the air volume to 800. This optimizes the quality of wood tar and the adsorption performance of bamboo charcoal.

[0016] Finished product processing: After the high-temperature bamboo charcoal is cooled to room temperature, unqualified products are removed by screening, and qualified bamboo charcoal is packaged and sold; the recovered wood tar and wood vinegar are further purified and graded, and then packaged separately for export to increase the added value of the products.

[0017] Pollutant emission test: The method of "Determination of particulate matter and sampling of gaseous pollutants in exhaust gas from stationary sources" (GB / T16157-1996) was adopted, and a flue gas sampler was used to collect samples at the flue gas emission outlet; Bamboo charcoal quality test, specific surface area: the BET nitrogen adsorption method (GB / T 19587-2017) was used for testing.

[0018] Example 1 A clean production process for the co-production of bamboo shavings charcoal and biomass pyrolysis byproducts, characterized by comprising the following steps: Raw material pretreatment: First, the bamboo shavings are dried with hot air at 160℃, controlling the moisture content to 8% to ensure the subsequent molding and carbonization effects. After drying, the bamboo shavings undergo primary crushing. The particle size distribution of the crushed bamboo powder is monitored in real time using a laser particle size analyzer. Coarse materials with a particle size greater than 1mm are returned to the secondary crushing process. The secondary crushing uses a variable frequency crusher with an adjustable speed within the range of 800r / min. The PLC control system links the laser particle size detection with the crusher speed to ensure that the proportion of bamboo powder with a particle size ≤1mm is ≥96%. At the same time, a magnetic separation process is used to remove metal impurities from the bamboo shavings. Bamboo powder molding: Pretreated bamboo powder is fed into a molding machine. The molding cylinder temperature is fixed at 350℃, and the molding temperature is dynamically adjusted to 280℃ according to the actual moisture content of the bamboo powder. The powder is then produced using a screw extrusion method to achieve a density of 1.2. Smooth-surfaced firewood sticks; High-temperature carbonization: The fuel briquettes are fed into a carbonization kiln, which is equipped with three sets of thermocouples to monitor the carbonization temperature of different areas in real time. The control system precisely regulates the firing process, first raising the temperature to 550℃ and maintaining it for 1.5 hours, then raising it to 800℃ and maintaining it for 2 hours to complete the high-temperature carbonization. This process transforms the briquettes into high-temperature bamboo charcoal with well-developed pores and excellent adsorption properties. The flue gas containing combustible gases and tar generated during the carbonization process is introduced into the subsequent resource recovery system. Flue gas resource utilization and environmental protection treatment: Gas-material separation: The flue gas first passes through a cyclone gas-material separation device to recover the uncarbonized bamboo shavings particles, which are then returned to the raw material pretreatment stage for reuse, thereby improving the utilization rate of raw materials; Multi-stage dust removal: The residual gas passes through three stages of treatment in sequence: water mist dust removal, bag filter + settling chamber dust removal and electrostatic dust removal, which deeply removes particulate matter in the flue gas and avoids pollutant emissions; Waste heat recovery: After flue gas purification, a heat exchanger with a surface area of ​​50 mm is installed. The finned heat exchanger transfers the waste heat of the 150°C flue gas to the cold air, preheats the cold air to 80°C, and then uses it in the bamboo shavings drying process. This complements the original heating system and reduces external energy consumption. Byproduct separation: The flue gas after waste heat recovery enters the condensation equipment to separate wood tar and wood vinegar; Gas recovery: The combustible gas remaining after condensation and separation is collected and used as auxiliary fuel in the drying and carbonization processes, realizing the recycling of energy; Interlocking Control: A variable frequency induced draft fan is installed at the flue gas outlet. Based on the temperature data monitored by thermocouples inside the carbonization kiln, the fan volume is controlled via temperature-flow linkage: when the carbonization temperature is 500℃, the air volume is adjusted to 1200... To enhance the collection efficiency of wood vinegar; when the carbonization temperature is 700℃, adjust the air volume to 800. This optimizes the quality of wood tar and the adsorption performance of bamboo charcoal.

[0019] Finished product processing: After the high-temperature bamboo charcoal is cooled to room temperature, unqualified products are removed by screening, and qualified bamboo charcoal is packaged and sold; the recovered wood tar and wood vinegar are further purified and graded, and then packaged separately for export to increase the added value of the products.

[0020] Example 2 A clean production process for the co-production of bamboo shavings charcoal and biomass pyrolysis byproducts, characterized by comprising the following steps: Raw material pretreatment: First, the bamboo shavings are dried with hot air at 250℃, controlling the moisture content to 10% to ensure the subsequent molding and carbonization effects. After drying, the bamboo shavings are first crushed, and the particle size distribution of the crushed bamboo powder is monitored in real time by a laser particle size analyzer. Coarse materials with a particle size greater than 1mm are returned to the second-stage crushing process. The second-stage crushing uses a variable frequency crusher with an adjustable speed within the range of 1200r / min. The laser particle size detection and crusher speed are linked through a PLC control system to ensure that the proportion of bamboo powder with a particle size ≤1mm is ≥97%. At the same time, a magnetic separation process is used to remove metal impurities from the bamboo shavings. Bamboo stick forming: Pretreated bamboo powder is fed into a forming machine. The forming cylinder temperature is fixed at 350℃, and the forming temperature is dynamically adjusted to 320℃ according to the actual moisture content of the bamboo powder. The powder is then formed using a screw extrusion method to achieve a density of 1.3. Smooth-surfaced firewood sticks; High-temperature carbonization: The fuel briquettes are fed into a carbonization kiln, which is equipped with three sets of thermocouples to monitor the carbonization temperature of different areas in real time. The control system precisely regulates the firing process, first raising the temperature to 600℃ and maintaining it for 1.5 hours, then raising it to 900℃ and maintaining it for 2 hours to complete the high-temperature carbonization. This process transforms the briquettes into high-temperature bamboo charcoal with well-developed pores and excellent adsorption properties. The flue gas containing combustible gases and tar generated during the carbonization process is introduced into the subsequent resource recovery system. Flue gas resource utilization and environmental protection treatment: Gas-material separation: The flue gas first passes through a cyclone gas-material separation device to recover the uncarbonized bamboo shavings particles, which are then returned to the raw material pretreatment stage for reuse, thereby improving the utilization rate of raw materials; Multi-stage dust removal: The residual gas passes through three stages of treatment in sequence: water mist dust removal, bag filter + settling chamber dust removal and electrostatic dust removal, which deeply removes particulate matter in the flue gas and avoids pollutant emissions; Waste heat recovery: After flue gas purification, a heat exchanger with a surface area of ​​50 mm is installed. The finned heat exchanger transfers the waste heat of the 200℃ flue gas to the cold air, preheats the cold air to 100℃ and then uses it in the bamboo chip drying process, complementing the original heating system and reducing external energy consumption. Byproduct separation: The flue gas after waste heat recovery enters the condensation equipment to separate wood tar and wood vinegar; Gas recovery: The combustible gas remaining after condensation and separation is collected and used as auxiliary fuel in the drying and carbonization processes, realizing the recycling of energy; Interlocking Control: A variable frequency induced draft fan is installed at the flue gas outlet. Based on the temperature data monitored by thermocouples inside the carbonization kiln, the fan volume is controlled via temperature-flow linkage: when the carbonization temperature is 600℃, the air volume is adjusted to 1200... To enhance the collection efficiency of wood vinegar; when the carbonization temperature is 1000℃, adjust the air volume to 800. This optimizes the quality of wood tar and the adsorption performance of bamboo charcoal.

[0021] Finished product processing: After the high-temperature bamboo charcoal is cooled to room temperature, unqualified products are removed by screening, and qualified bamboo charcoal is packaged and sold; the recovered wood tar and wood vinegar are further purified and graded, and then packaged separately for export to increase the added value of the products.

[0022] Example 3 A clean production process for the co-production of bamboo shavings charcoal and biomass pyrolysis byproducts, characterized by comprising the following steps: Raw material pretreatment: First, the bamboo shavings are dried with hot air at 190℃, controlling the moisture content to 9% to ensure the subsequent molding and carbonization effects. After drying, the bamboo shavings undergo primary crushing. The particle size distribution of the crushed bamboo powder is monitored in real time using a laser particle size analyzer. Coarse materials with a particle size greater than 1mm are returned to the secondary crushing process. The secondary crushing uses a variable frequency crusher with an adjustable speed within the range of 1400r / min. The PLC control system links the laser particle size detection with the crusher speed to ensure that the proportion of bamboo powder with a particle size ≤1mm is ≥96.2%. At the same time, a magnetic separation process is used to remove metal impurities from the bamboo shavings. Bamboo powder molding: Pretreated bamboo powder is fed into a molding machine. The molding cylinder temperature is fixed at 346℃, and the molding temperature is dynamically adjusted to 290℃ according to the actual moisture content of the bamboo powder. The powder is then produced using a screw extrusion method to a density of 1.27. Smooth-surfaced firewood sticks; High-temperature carbonization: The fuel briquettes are fed into a carbonization kiln, which is equipped with three sets of thermocouples to monitor the carbonization temperature of different areas in real time. The control system precisely regulates the firing process, first raising the temperature to 560℃ and maintaining it for 1.5 hours, then raising it to 850℃ and maintaining it for 2 hours to complete the high-temperature carbonization. This process transforms the briquettes into high-temperature bamboo charcoal with well-developed pores and excellent adsorption properties. The flue gas containing combustible gases and tar generated during the carbonization process is introduced into the subsequent resource recovery system. Flue gas resource utilization and environmental protection treatment: Gas-material separation: The flue gas first passes through a cyclone gas-material separation device to recover the uncarbonized bamboo shavings particles, which are then returned to the raw material pretreatment stage for reuse, thereby improving the utilization rate of raw materials; Multi-stage dust removal: The residual gas passes through three stages of treatment in sequence: water mist dust removal, bag filter + settling chamber dust removal and electrostatic dust removal, which deeply removes particulate matter in the flue gas and avoids pollutant emissions; Waste heat recovery: After flue gas purification, a heat exchanger with a surface area of ​​50 mm is installed. The finned heat exchanger transfers the waste heat of the 180°C flue gas to the cold air, preheats the cold air to 90°C, and then uses it in the bamboo shavings drying process. This complements the original heating system and reduces external energy consumption. Byproduct separation: The flue gas after waste heat recovery enters the condensation equipment to separate wood tar and wood vinegar; Gas recovery: The combustible gas remaining after condensation and separation is collected and used as auxiliary fuel in the drying and carbonization processes, realizing the recycling of energy; Interlocking Control: A variable frequency induced draft fan is installed at the flue gas outlet. Based on the temperature data monitored by thermocouples inside the carbonization kiln, the fan volume is controlled via temperature-flow linkage: when the carbonization temperature is 550℃, the air volume is adjusted to 1200. To enhance the collection efficiency of wood vinegar; when the carbonization temperature is 900℃, adjust the air volume to 800. This optimizes the quality of wood tar and the adsorption performance of bamboo charcoal.

[0023] Finished product processing: After the high-temperature bamboo charcoal is cooled to room temperature, unqualified products are removed by screening, and qualified bamboo charcoal is packaged and sold; the recovered wood tar and wood vinegar are further purified and graded, and then packaged separately for export to increase the added value of the products.

[0024] Comparative Example 1 Raw materials: bamboo chips from the same batch as in Example 1, with the same initial state.

[0025] Process parameters: Raw material processing: only one-stage crushing + manual sieving, no laser particle size detection and PLC linkage, the proportion of bamboo powder with a particle size ≤1mm after crushing is 65%; naturally dried to a moisture content of 15%, no magnetic separation impurity removal step.

[0026] Bar molding: Using a standard molding machine, the molding cylinder temperature lacks precise control (approximately 330℃), the molding temperature is fixed at 290℃, and the bar density is 0.9. (The surface is prone to cracking); High-temperature carbonization: Traditional earthen kiln carbonization, temperature 900℃ (no thermocouple monitoring, temperature difference ±50℃), no precise temperature control; Flue gas treatment: Only simple bag filter dust collection, without cyclone gas-material separation, waste heat recovery and condensation separation system, flue gas is directly emitted, and wood tar and wood vinegar are naturally collected (without purification). Finished product processing: Bamboo charcoal is screened after natural cooling, and by-products are packaged without grading.

[0027] Table 1: Performance Tests

[0028] As shown in Table 1, the raw material utilization rate of all examples was consistently above 98%, which was higher than the 84.7% of Comparative Example 1. This was mainly due to the two-stage crushing linkage control and the uncarbonized particle recovery process.

[0029] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0030] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0031] Those skilled in the art should understand that the above descriptions are merely several specific embodiments of the present invention, and not all embodiments.

Claims

1. A clean production process for the co-production of charcoal from bamboo shavings and by-products from biomass pyrolysis, characterized in that, Includes the following steps: S1. Raw material pretreatment: Bamboo shavings are dried with hot air at 160-250℃ to a moisture content of 6%-12%. The dried bamboo shavings are first subjected to primary crushing, and the coarse material separated by sieving is returned to secondary crushing. At the same time, metal impurities are removed by magnetic separation. A laser particle size analyzer is installed between the primary crushing and sieving. The secondary crushing adopts a frequency converter and is controlled by a PLC control system to ensure that the proportion of bamboo powder with a particle size ≤1mm is ≥95%. S2. Bamboo stick forming: The pretreated bamboo powder is fed into the forming machine, the forming cylinder temperature is controlled, and the forming temperature is adjusted to 260-320℃ according to the moisture content of the bamboo powder. The bamboo powder is then extruded into dense and smooth bamboo sticks. S3. High-temperature carbonization: The fuel briquettes are fed into the carbonization kiln and fired at high temperature through the control system, transforming the fuel briquettes into high-temperature bamboo charcoal with well-developed pores and good adsorption properties; 3 sets of thermocouples are installed in the carbonization kiln to monitor the carbonization temperature in real time. S4. Flue gas resource utilization and environmental protection treatment: The flue gas generated by carbonization is first separated by cyclone gas-material separation, and the uncarbonized bamboo shavings are recovered and returned to the raw material processing stage for reuse. The residual gas is sequentially treated by water mist dust removal, bag filter + settling chamber dust removal, and electrostatic dust removal, and then enters the condenser to separate wood tar and wood vinegar. After purification, the flue gas recovers residual heat through a finned heat exchanger to preheat the cold air for use in the bamboo shavings drying process in step 1. The remaining combustible gas is used as auxiliary fuel for the drying and carbonization processes. A variable frequency induced draft fan is installed at the flue gas outlet, controlled by temperature-flow linkage: when the carbonization temperature is 500-600℃, the fan flow rate is adjusted to 1200 m³ / h. To enhance the collection of wood vinegar; when the carbonization temperature is 700-1000℃, the air volume of the induced draft fan should be adjusted to 800. To optimize the quality of wood tar and bamboo charcoal; S5. Finished product processing: Cool the high-temperature bamboo charcoal to room temperature, screen it, and pack it into boxes; the recovered wood tar and wood vinegar are purified, graded, and packaged separately.

2. The clean production process for co-producing bamboo shavings charcoal and biomass pyrolysis by-products according to claim 1, characterized in that, In S1, the speed adjustment range of the variable frequency pulverizer is 500-1500 r / min.

3. The clean production process for co-producing bamboo shavings charcoal and biomass pyrolysis by-products according to claim 1, characterized in that, In step S2, the temperature of the forming cylinder is controlled to be 340-350℃.

4. The clean production process for co-producing bamboo shavings charcoal and biomass pyrolysis by-products according to claim 1, characterized in that, In S3, the high-temperature carbonization temperature range of the carbonization kiln is 500-1000℃.

5. The clean production process for co-producing bamboo shavings charcoal and biomass pyrolysis by-products according to claim 1, characterized in that, In S4, the preheating temperature of the cold air is 80-100℃.

6. The clean production process for co-producing bamboo shavings charcoal and biomass pyrolysis by-products according to claim 1, characterized in that, In S4, the heat exchange area of ​​the finned heat exchanger is 50. It is used to transfer the residual heat of flue gas at 150-200℃ to cold air.

7. The clean production process for co-producing bamboo shavings charcoal and biomass pyrolysis by-products according to claim 1, characterized in that, In step S4, the separated wood tar is used as a raw material for coatings.

8. The clean production process for co-producing bamboo shavings charcoal and biomass pyrolysis by-products according to claim 1, characterized in that, In step S4, the separated wood vinegar is used as an agricultural antibacterial agent.

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