Methods for producing low-carbon, negative-carbon products using agricultural and forestry waste as raw materials

Abstract

The present invention relates to a method for producing low-carbon and negative-carbon products using agricultural and forestry waste as raw materials, which includes three steps: ecological cultivation transformation, fiberization transformation, and manufacturing of finished products. The present invention can effectively increase the production capacity and land value of infertile and polluted land such as desertified land and alkalized land, and is useful for improving the soil quality of infertile and polluted land such as desertified land and alkalized land. In addition, the composite material has excellent degradable performance, and further improves its mechanical performance and tensile performance. Compared with traditional fully degradable products, the energy consumption and cost of the composite material production are greatly reduced, and one of the main raw materials in the production process is biomass resources, which can achieve the purpose of obtaining "low-carbon" and "negative carbon" products in the production stage.

Description

[Technical field]

[0001] The present invention relates to a method for producing low-carbon, negative-carbon products using agricultural and forestry waste as raw materials, and belongs to the field of environmentally friendly technology. [Background technology]

[0002] Under the guidance of the "dual carbon" strategy, all industries in China have launched the application of carbon emission reduction technologies and the research, development and manufacturing of negative carbon products. In the field of material manufacturing and processing, if low-carbon / negative carbon materials are produced using biomass-derived raw materials such as plants instead of petroleum-based raw materials, carbon emissions from raw materials in the product production stage can be saved. In addition, if the biomass raw materials used are derived from plants grown on non-arable land such as tidal flats, carbon exchange resources can be created for product production, while further increasing the economic value of land and effectively improving soil quality. In addition, by adopting highly efficient processing and manufacturing technologies and equipment and reducing energy consumption from raw materials to products, carbon emissions in the product production and processing stages can be further reduced.

[0003] At present, relevant research and testing is mainly focused on the development and design of negative carbon / low carbon processes in related industries, and there is very little research on final negative carbon / low carbon products, so there is a lack of mature low carbon / negative carbon product development, production and manufacturing processes and equipment. In addition, some of the currently used biomass raw materials use food, which has problems such as food waste and high costs, and the related production, processing and manufacturing technologies and equipment have problems such as high energy consumption and large carbon emissions, and there are obvious shortcomings and room for improvement in key utilization stages, cost reduction, efficiency improvement, manufacturing and application of high-value products, and carbon emission management and control of the entire production process.

[0004] To address the above challenges, it is necessary to develop methods to use agricultural and forestry waste, which is low-cost and has a wide range of sources, as raw materials to produce low-carbon / negative-carbon products through advanced processing processes and equipment, in order to meet the needs of actual use and industry development. Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention provides a method for producing low-carbon and negative-carbon products using agricultural and forestry waste as raw materials to solve the bottlenecks and shortcomings in the prior art. [Means for solving the problem]

[0006] A method for producing low-carbon, negative-carbon products using agricultural and forestry waste as raw materials, comprising: S1 step of carrying out ecological cultivation and modification, which includes first selecting land to be improved, and cultivating and cultivating carbon-fixing economic plants that can produce high-performance and high-yield plant fiber strains on the selected land; S2 step of fiber conversion, in which the economic plants cultivated in S1 step are periodically harvested and collected, the collected plant raw materials are crushed and sieved, and the plant fiber waste obtained through sieving is modified and activated to obtain activated plant fibers; and S3 step for producing a finished product, which comprises finishing the activated plant fiber raw material obtained in S2 step to obtain a low carbon product.

[0007] Furthermore, in step S1, the land to be improved is desertified land, saline-alkali land, or heavy metal-contaminated land, and the high-performance, high-yield plant fiber strain is co-cultivated with one or more of eucalyptus, poplar, ramie, jute, blue hemp, hemp, hemp, flax, rough hemp, red hemp, kenaf, Chinese larkspur, and barley.

[0008] Furthermore, in the step S2, during the modification activation operation, one or more of an acid treatment, an alkali treatment, and a heat treatment are used.

[0009] Furthermore, the low-carbon products obtained in S3 are three types of products: biocarbon, a composite material of plant fiber material and fully degradable material, and fully degradable bio-based material.

[0010] Furthermore, the reforming activation treatment device used during the reforming activation work includes an apparatus frame, a working chamber, a transport roller passage, a steam generator, an atomizing head, a spray head, an electric heating device, a reflux fan, a chemical tank, a spray pump and a driving circuit, the apparatus frame is a frame structure having a rectangular cross section and an axis distributed parallel to a horizontal plane, the working chamber and the transport roller passage are both fitted into the apparatus frame and distributed parallel to the axis of the apparatus frame, the working chamber is a chamber structure having a rectangular cross section, both ends of the transport roller passage are located outside the working chamber, and 50% to 80% of the effective length of the transport roller passage is fitted into the working chamber, the interval distance between the transport roller passage and the bottom of the working chamber is 10 mm or more, the atomizing head is a plurality of heads, fitted into the working chamber and connected to the bottom of the working chamber, and located below the transport roller passage, and the axis of each atomizing head and the lower end surface of the transport roller passage are at an angle of 30° to 50°. The spray heads are connected in parallel and communicate with the steam generator, the spray heads and the electric heating device are each multiple, fitted into the working chamber and connected at the top of the working chamber, the axes of the spray heads and the electric heating device intersect with the upper end surface of the transport roller passage and form an angle of 30° to 90°, the spray heads are connected in parallel and communicate with each other through the guide pipe spray pump, the spray pump is further connected to the drug tank through the guide pipe, the upper end surface of the working chamber is provided with only one reflux port, the reflux port is connected to the reflux fan through the guide pipe, the reflux fan is further connected to the steam generator, the steam generator, the reflux fan, the drug tank, the spray pump and the driving circuit are all connected to the outer surface of the device frame, and the driving circuit is further electrically connected to the transport roller passage, the steam generator, the electric heating device, the reflux fan, the drug tank and the spray pump.

[0011] Furthermore, the electric heating device is either an electric heating wire or a far-infrared radiation heating device, and each electric heating device is connected in parallel with each other and distributed at intervals from the spray head.

[0012] Furthermore, the transport roller passage is slidably connected to both the inner surface of the device frame and the inner surface of the working chamber through a lifting drive mechanism, the axis of the lifting drive mechanism and the axis of the device frame are vertically distributed, the lifting drive mechanism is electrically connected to a drive circuit, and the lifting drive mechanism is one of a hydraulic cylinder, a pneumatic cylinder, an electric telescopic lever, and a gear rack mechanism.

[0013] Furthermore, in the biocarbon production method, the activated plant fiber obtained in step S2 is first heated to 120°C to 500°C in an oxygen-blocking environment, continued to be heated for 20 to 60 minutes, and then molded in a screw extruder to obtain a biocarbon product, and the particle size of the modified and activated plant fiber obtained in step S2 is 500 mesh or more.

[0014] Furthermore, in the manufacturing method of the composite material of plant fiber and fully degradable material, the activated plant fiber and fully degradable material obtained in step S2 are first blended, and then the blended material is added to a screw extrusion granulator for extrusion. During the extrusion process, multiple side feed devices are provided in the screw extrusion granulator, and auxiliary materials are added to the blended material of the activated plant fiber and fully degradable material through the side feed devices, and extrusion molding is performed by the screw extrusion granulator to obtain composite material particles of plant fiber and fully degradable material.

[0015] Furthermore, in the method for producing a completely degradable bio-based material, the activated plant fiber obtained in step S2 is first added to a fermentation reactor to carry out biological fermentation, the fermented product is separated and purified, and finally the purified product is extruded and granulated using a screw extrusion granulator to obtain a completely degradable bio-based material, and the particle size of the activated plant fiber obtained in step S2 is 1000 mesh or more. Effect of the Invention

[0016] The present invention has the following advantages:

[0017] (1) Introduce high-performance, high-yield plants to infertile, contaminated land such as desertified land and alkalized land, achieve soil environment improvement and highly efficient carbon fixation in plants, produce high-performance plant fiber, and effectively increase the productivity and land value of infertile, contaminated land such as desertified land and alkalized land, and also help improve the soil quality of infertile, contaminated land such as desertified land and alkalized land.

[0018] (2) The performance and quality of composite materials made of plant fibers and fully degradable materials meet relevant Chinese standards. The addition of long fibers further improves the mechanical and tensile properties of the materials. Fully degradable bio-based materials and bio-carbon are produced from biomass resources, and achieve energy savings, consumption reduction, cost reduction and efficiency improvement compared with traditional fossil energy production process routes.

[0019] (3) Composite products of plant fibers and fully degradable materials replace part of the fully degradable materials with low-cost plant fibers, significantly reducing raw material costs and showing obvious reductions in production costs compared with fully degradable products sold on the market. Fully degradable bio-based materials and bio-carbon products use lower-cost, superior-performance plant fibers as raw materials, which can effectively reduce production costs.

[0020] (4) The biomass resources adopted in the production process of this project can realize industrial "low carbon" and produce "negative carbon" products, helping to achieve the national "dual carbon" goal.

[0021] The present invention will now be described in detail with reference to the drawings and specific embodiments. [Brief description of the drawings]

[0022] [Figure 1] 2 is a flow chart of the method of the present invention. [Diagram 2] FIG. 2 is a structural schematic diagram of a reforming activation treatment device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] In order to realize the technical means, creative features, and achieve the objectives and effects of the present invention, the present invention will be further described in conjunction with the following specific embodiments.

[0024] As shown in FIG. 1, a method for producing low-carbon negative carbon products using agricultural and forestry waste as raw materials, S1 step of carrying out ecological cultivation and modification, which includes first selecting land to be improved, and cultivating and cultivating carbon-fixing economic plants that can produce high-performance and high-yield plant fiber strains on the selected land; S2 step of fiber conversion, in which the economic plants cultivated in S1 step are periodically harvested and collected, the collected plant raw materials are crushed and sieved, and the plant fiber waste obtained through sieving is modified and activated to obtain activated plant fibers; and S3 step for producing a finished product, which comprises finishing the activated plant fiber raw material obtained in S2 step to obtain a low carbon product.

[0025] In this embodiment, in step S1, the land to be improved is desertified land, saline-alkali land, or heavy metal-contaminated land, and the high-performance and high-yield plant fiber strains are co-cultivated with one or more of eucalyptus, poplar, ramie, jute, blue hemp, hemp, hemp, flax, rough hemp, red hemp, kenaf, Chinese larkspur, and barley.

[0026] In the step S2, during the modification activation process, one or more of an acid treatment, an alkali treatment, and a heat treatment are used.

[0027] As shown in FIG. 2, the reforming activation treatment device used during the reforming activation operation further includes an apparatus frame 1, a working chamber 2, a transport roller passage 3, a steam generator 4, an atomizing head 5, a spray head 6, an electric heating device 7, a reflux fan 8, a chemical tank 9, a spray pump 10, and a drive circuit 11. The apparatus frame 1 is a frame structure having a rectangular cross section and an axis parallel to a horizontal plane. The working chamber 2 and the transport roller passage 3 are both fitted into the apparatus frame 1 and are parallel to the axis of the apparatus frame 1. The working chamber 2 has a rectangular cross section, both ends of the transport roller passage 3 are located outside the working chamber 2, and 50% to 80% of the effective length of the transport roller passage 3 is fitted into the working chamber 2, and the distance between the transport roller passage 3 and the bottom of the working chamber 2 is 10 mm or more. The atomizing heads 5 are multiple, fitted into the working chamber 2 and connected to the bottom of the working chamber 2, and located below the transport roller passage 3. The axis of each atomizing head 5 and the lower end surface of the transport roller passage 3 are inclined at an angle of 30°. The atomizing heads 5 are connected in parallel and communicate with the steam generating device 4. The spray heads 6 and the electric heating device 7 are each a plurality of units, fitted into the working chamber 2 and connected at the top of the working chamber 2. The axes of the spray heads 6 and the electric heating device 7 cross the upper end surface of the transport roller passage 3 and form an angle of 30° to 90°. The spray heads 6 are connected in parallel and communicate with each other through the guide pipe spray pump 10. The spray pump 10 further has a guide pipe The working chamber 2 is provided on the upper end surface thereof with a single reflux port 12, which is connected to a reflux fan 8 via a guide pipe, and the reflux fan 8 is further connected to a steam generator 4. The steam generator 4, the reflux fan 8, the chemical tank 9, the spray pump 10 and the drive circuit 11 are all connected to the outer surface of the device frame 1, and the drive circuit 11 is further electrically connected to the transport roller passage 3, the steam generator 4, the electric heating device 7, the reflux fan 8, the chemical tank 9 and the spray pump 10.

[0028] More preferably, the electric heating device 7 is either an electric heating wire or a far-infrared radiation heating device, and the electric heating devices 7 are connected in parallel with each other and distributed at intervals from the spray head 6 .

[0029] In addition, the transport roller passage 3 is slidably connected to both the inner surfaces of the equipment frame 1 and the working chamber 2 via a lifting drive mechanism 13, the axis of the lifting drive mechanism 13 and the axis of the equipment frame 1 are vertically distributed, the lifting drive mechanism 13 is electrically connected to a drive circuit 11, and the lifting drive mechanism 13 is any one of a hydraulic cylinder, a pneumatic cylinder, an electric telescopic lever, and a gear rack mechanism.

[0030] In this embodiment, the low-carbon products obtained in S3 are three types of products: biocarbon, a composite material of plant fiber material and fully degradable material, and fully degradable bio-based material.

[0031] Furthermore, in the biocarbon production method, the activated plant fiber obtained in step S2 is first heated to 120°C to 500°C in an oxygen-blocking environment, continued to be heated for 20 to 60 minutes, and then molded in a screw extruder to obtain a biocarbon product, and the particle size of the modified and activated plant fiber obtained in step S2 is 500 mesh or more.

[0032] Here, when heating in an oxygen-blocking environment, the heat source is either superheated steam or high-temperature nitrogen gas.Furthermore, in the case of the composite material of the plant fiber and the completely degradable material, the activated plant fiber and the completely degradable material obtained in step S2 are first blended, and then the blended material is added to a screw extrusion granulator for extrusion, and during the extrusion process, the screw extrusion granulator is equipped with a plurality of side feed devices, and the blended material of the activated plant fiber and the completely degradable material is added with the side feed devices, and extrusion molding is performed by the screw extrusion granulator to obtain composite material particles of the plant fiber and the completely degradable material.

[0033] Furthermore, in the method for producing a completely degradable bio-based material, the activated plant fiber obtained in step S2 is first added to a fermentation reactor to carry out biological fermentation at a fermentation temperature of 25°C to 50°C, the product after fermentation is separated and purified, and finally, the purified product is extruded and granulated by a screw extruder to obtain a completely degradable bio-based material, and the particle size of the activated plant fiber obtained in step S2 is 1000 mesh or more. The fully degradable material used is any one of PLA (polylactic acid), PHA (polyhydroxyalkanoate), PBAT (polybutylene adipate / terephthalate), and PCL (polycaprolactone). The present invention has the following advantages.

[0034] (1) Introduce high-performance, high-yield plants to infertile, contaminated land such as desertified land and alkalized land, achieve soil environment improvement and highly efficient carbon fixation in plants, produce high-performance plant fiber, and effectively increase the productivity and land value of infertile, contaminated land such as desertified land and alkalized land, and also help improve the soil quality of infertile, contaminated land such as desertified land and alkalized land.

[0035] (2) The performance and quality of composite materials made of plant fibers and fully degradable materials meet relevant Chinese standards. The addition of long fibers further improves the mechanical and tensile properties of the materials. Fully degradable bio-based materials and bio-carbon are produced from biomass resources, and achieve energy savings, consumption reduction, cost reduction and efficiency improvement compared with traditional fossil energy production process routes.

[0036] (3) Composite products of plant fibers and fully degradable materials use low-cost plant fibers to partially replace fully degradable materials, significantly reducing raw material costs and demonstrating a significant reduction in production costs compared with fully degradable products sold on the market. Fully degradable bio-based materials and bio-carbon products use lower-cost, high-performance plant fibers as raw materials, effectively reducing production costs. (4) The biomass resources adopted in the production process of this project can realize industrial "low carbon" and produce "negative carbon" products, helping to achieve the national "dual carbon" goal.

[0037] The above shows and describes the basic principle, main features and advantages of the present invention. Those skilled in the art can understand that the present invention is not limited to the above-mentioned embodiments, and the above-mentioned embodiments and descriptions in the specification are only illustrative of the principles of the present invention, and the present invention can also have various modifications and improvements without departing from the spirit and scope of the present invention, and all of these modifications and improvements are within the scope of the present invention that is claimed for protection. The scope of protection that the present invention is protected by is defined by the appended claims and their equivalents.

Claims

1. A method for producing low-carbon, negative-carbon products using agricultural and forestry waste as raw materials, comprising: S1 step of carrying out ecological cultivation and modification, which includes first selecting land to be improved, and cultivating and cultivating carbon fixing economic plants that can produce high-performance and high-yield plant fiber strains on the selected land; S2 step of fiber conversion, in which the economic plants grown in S1 step are periodically harvested and collected, the collected plant raw materials are crushed and sieved, and the plant fiber waste obtained through sieving is modified and activated to obtain activated plant fibers; A method for producing low-carbon, negative-carbon products using agricultural and forestry waste as raw materials, comprising: a step S3 for producing a finished product, in which the activated plant fiber raw material obtained in the step S2 is finished and processed to obtain a low-carbon product.

2. The method for producing low-carbon minus-carbon products using agricultural and forestry waste as raw materials, as described in claim 1, characterized in that in step S2, during the modification and activation work, one or a combination of acid treatment, alkali treatment, and heat treatment is used.

3. The reforming activation treatment device used in the reforming activation operation includes an apparatus frame, a working chamber, a transport roller passage, a steam generator, an atomizing head, a spray head, an electric heating device, a reflux fan, a chemical tank, a spray pump and a driving circuit, the apparatus frame is a frame structure with a rectangular cross section and an axis parallel to a horizontal plane, the working chamber and the transport roller passage are both fitted into the apparatus frame and are parallel to the axis of the apparatus frame, the working chamber is a chamber structure with a rectangular cross section, both ends of the transport roller passage are located outside the working chamber, and 50% to 80% of the effective length of the transport roller passage is fitted into the working chamber, the distance between the transport roller passage and the bottom of the working chamber is 10 mm or more, the atomizing head is a plurality of heads, fitted into the working chamber and connected to the bottom of the working chamber, and located below the transport roller passage, the axis of each head forms an angle of 30° to 90° with the lower end surface of the transport roller passage, the atomizing heads are connected in parallel, The method for producing low-carbon and negative-carbon products using agricultural and forestry waste as raw materials according to claim 1 or 2, characterized in that: the spray head and the electric heating device are each connected to a steam generating device, the spray head and the electric heating device are each multiple, fitted into the working chamber and connected at the top of the working chamber, the axes of the spray head and the electric heating device intersect with the upper end surface of the transport roller passage and form an included angle of 30° to 90°, the spray heads are connected in parallel and respectively communicate through the guide pipe spray pump, the spray pump further communicates with the chemical tank through the guide pipe, the upper end surface of the working chamber is provided with only one reflux port, the reflux port communicates with the reflux fan through the guide pipe, the reflux fan further communicates with the steam generating device, the steam generating device, the reflux fan, the chemical tank, the spray pump and the driving circuit are all connected to the outer surface of the device frame, and the driving circuit is further electrically connected to the transport roller passage, the steam generating device, the electric heating device, the reflux fan, the chemical tank and the spray pump.

4. The method for producing low-carbon negative-carbon products using agricultural and forestry waste as raw materials, as described in claim 3, characterized in that the electric heating device is either an electric heating wire or a far-infrared radiation heating device, and each electric heating device is connected in parallel with each other and distributed at an interval from the spray head.

5. The method for producing low-carbon and negative-carbon products using agricultural and forestry waste as raw materials as described in claim 3, characterized in that the transport roller passage is slidably connected to both the equipment frame and the inner surface of the working chamber via a lifting drive mechanism, the axis of the lifting drive mechanism and the axis of the equipment frame are vertically distributed, the lifting drive mechanism is electrically connected to a drive circuit, and the lifting drive mechanism is one of a hydraulic cylinder, a pneumatic cylinder, an electric telescopic lever, and a gear rack mechanism.

6. The method for producing low-carbon negative-carbon products using agricultural and forestry waste as raw materials, as described in claim 1, characterized in that the low-carbon products obtained in S3 are three types of products: biocarbon, a composite material of plant fiber material and fully degradable material, and fully degradable bio-based material.

7. In the bio-carbon production method, the activated plant fiber obtained in step S2 is first heated to 120°C to 500°C in an oxygen-blocking environment, and is continued to be heated for 20 to 60 minutes, and then extruded to obtain a bio-carbon product, and the particle size of the modified and activated plant fiber obtained in step S2 is all 500 mesh or more. This is the method for producing low-carbon negative-carbon products using agricultural and forestry waste as raw materials, as described in claim 6.

8. The method for producing low-carbon and negative-carbon products using agricultural and forestry waste as raw materials, as described in claim 7, characterized in that when producing the composite material of plant fiber and fully degradable material, the activated plant fiber and fully degradable material obtained in step S2 are first blended, and then the blended material is added to a screw extrusion granulator to perform extrusion. During the extrusion process, the screw extrusion granulator is equipped with multiple side feed devices, and auxiliary materials are added to the blended material of the activated plant fiber and fully degradable material through the side feed devices, and extrusion molding is performed by the screw extrusion granulator to obtain composite material particles of plant fiber and fully degradable material.

9. In the method for producing a fully degradable bio-based material, the activated plant fiber obtained in step S2 is first added to a fermentation reactor to carry out biological fermentation, the fermented product is separated and purified, and finally the purified product is extruded and granulated using a screw extrusion granulator to obtain a fully degradable bio-based material, characterized in that the particle size of the activated plant fiber obtained in step S2 is 1000 mesh or more.

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