Co-production process for preparing liquid fertilizer and biomass carbon from waste melon seedlings

Abstract

The invention relates to the technical field of agricultural waste recovery, and particularly discloses a co-production process for preparing a liquid fertilizer and biomass carbon from waste melon seedlings. Comprising the following steps: S1, crushing waste melon seedlings to obtain crushed melon seedlings; s2, the crushed melon seedlings are subjected to filter pressing separation, and melon seedling wet residues and melon seedling juice are obtained; s3, drying the wet residues of the melon seedlings to obtain dry materials of the melon seedlings; s4, carrying out carbonization treatment on the dry melon seedling material to obtain biomass charcoal and high-temperature oil gas; s5, carrying out cooling treatment on the biomass charcoal to obtain cooled biomass charcoal; s6, the generated waste heat passes through a heat storage station to rotate; s7, carrying out molding treatment on the cooled biomass charcoal to obtain a biomass charcoal product; and S8, sequentially carrying out disinfection treatment, ingredient mixing and fertilizer fermentation on the melon seedling juice. The co-production process can be used in the field of agricultural waste resourceful treatment, and has the advantages of high process integration level, sufficient resource utilization rate and low energy consumption.

Description

Technical Field

[0001] This application relates to the field of agricultural waste recycling technology, and more specifically, it relates to a co-production process for producing liquid fertilizer and biomass carbon from waste melon vines. Background Technology

[0002] In the field of agricultural waste recycling technology, discarded melon vines can be widely adapted to agricultural production, energy supply, and environmental governance scenarios through various technical pathways such as fertilizer, feed, energy, materials, and ecological methods. Their advantages are reflected in high resource utilization, achieving reduction, harmlessness, and resource recovery of agricultural waste, and alleviating environmental pollution caused by straw burning. They also have significant economic value, expanding the added value of agricultural products and providing farmers with additional income channels. Furthermore, the recycling technology is mature, easy to operate, and low in cost, making it easy to promote in rural areas.

[0003] A search revealed a melon-promoting enzyme liquid fertilizer and its application in publication number CN112500222A. The aim is to overcome the obstacles of continuous cropping of greenhouse melons while simultaneously achieving the harmless decomposition and utilization of agricultural waste. This invention's enzyme liquid fertilizer can improve soil nutrient utilization, enhance soil physical and chemical properties, comprehensively improve soil structure, making it loose, breathable, water-retentive, fertilizer-retaining, drought-resistant, flood-resistant, and increasing soil temperature. The beneficial microorganisms contained in the enzyme liquid fertilizer can kill pathogens in the soil, overcome crop replanting diseases, control the occurrence of pests and diseases, and can stably increase yield and improve fruit quality.

[0004] The aforementioned application involves turning waste melon peels and vines into enzyme liquid fertilizer, which can fully decompose agricultural resource waste. However, its treatment method is relatively simple, only producing liquid fertilizer through fermentation process. It does not separate and diversify the solid and liquid components of the melon vines, and also lacks energy recovery design, resulting in insufficient resource utilization of solid components, high overall energy consumption, and limiting the efficiency and economic benefits of resource recycling. Summary of the Invention

[0005] To address the issues of insufficient resource utilization of solid components and high overall energy consumption resulting from the production of enzyme liquid fertilizer from discarded melon peels and vines, this application provides a co-production process for producing liquid fertilizer and biomass carbon from discarded melon vines.

[0006] This application provides a co-production process for producing liquid fertilizer and biomass carbon from waste melon vines, using the following technical solution: A co-production process for producing liquid fertilizer and biochar from waste melon vines includes the following steps: S1. The waste melon vines are crushed to obtain crushed melon vines; S2. The crushed melon vines obtained in S1 are separated by pressure filtration to obtain wet melon vine residue and melon vine juice; S3. The wet residue of melon vines obtained in S2 is dried to obtain dried melon vine material with a moisture content of ≤15%; S4. Carbonize the dried melon vines obtained in S3 to obtain biochar and high-temperature oil and gas. S5. Cool the biochar obtained in S4 to obtain cooled biochar. S6. The waste heat generated during the carbonization process of S4 and the waste heat generated during the cooling process of S5 are recycled through the heat storage station and then used to supply the heat for the carbonization process of S4 and the drying process of S3. S7. The cooled biochar is shaped to obtain biochar products. S8. The melon vine juice obtained in S2 is disinfected, mixed with ingredients, and fermented with fertilizer in sequence to obtain agricultural liquid fertilizer.

[0007] By adopting the above technical solution, the integrated process of crushing, filtration, drying, carbonization, cooling, waste heat recovery, molding, and liquid fertilizer fermentation is used to separately utilize the solid and liquid components of melon vines. The juice of melon vines is rich in nutrients such as nitrogen, phosphorus, and potassium and can be directly used for the preparation of liquid fertilizer. The wet residue of melon vines is converted into biochar through carbonization. At the same time, the process recovers waste heat to reduce energy consumption. Therefore, the full utilization of waste melon vines is realized, producing high-value-added biochar and agricultural liquid fertilizer, and achieving both environmental and economic benefits.

[0008] Preferably, in step S1, the pulverization process controls the pulverization length of the melon vines to be ≤10mm.

[0009] By adopting the above technical solution, the melon vines are cut into smaller sizes using a fine crushing process, which increases the specific surface area of ​​the material. This facilitates more complete separation of juice in the subsequent pressure filtration step, reduces residual moisture, and provides uniformly sized raw materials for the carbonization process to promote uniform pyrolysis reaction. Therefore, the overall juice extraction efficiency and carbonization reaction efficiency are improved, resulting in higher quality intermediate products.

[0010] Preferably, in step S2, the solid content of the wet residue of melon vines obtained after pressure filtration is controlled to be 40% to 60%.

[0011] By adopting the above technical solution, the solid content of the wet residue of melon vines after pressure filtration is controlled within this specific range, so that the wet residue maintains a certain structural strength for easy transportation and drying, while avoiding the increase in drying energy consumption due to excessive solid content or the insufficient extraction of juice due to excessively low solid content. This balances the solid-liquid separation effect with the energy consumption of subsequent processing, thus providing raw materials with suitable moisture content for drying and carbonization processes and optimizing the economics of the process.

[0012] Preferably, in step S3, the drying temperature is 80℃~120℃ and the drying time is 30~90 minutes.

[0013] By adopting the above technical solution, the moisture content of the wet residue of melon vines can be reduced to the level required for carbonization in a short time due to the relatively low temperature drying process. This avoids the thermal denaturation of organic matter or loss of nutrients that may be caused by high temperature and long-term drying, while retaining the volatile active ingredients in the raw materials. Therefore, it lays the foundation for the carbonization preparation of high-quality biochar and reduces energy consumption.

[0014] Preferably, in step S4, the carbonization treatment is negative pressure combustion pyrolysis, the pyrolysis temperature is 400℃~600℃, and the pyrolysis time is 30~120 minutes.

[0015] By adopting the above technical solution, pyrolysis under negative pressure and specific temperature and time conditions creates an oxygen-free or low-oxygen environment, causing the organic matter in the dried melon vines to undergo thermal decomposition without complete combustion, generating biochar mainly composed of fixed carbon and volatile high-temperature oil and gas. By controlling the temperature and time, the pore structure and yield of the biochar can be adjusted, thus realizing the transformation of dried melon vines into high-value biochar and recyclable energy, and improving resource utilization.

[0016] Preferably, in step S5, the cooling process specifically involves: using a heat exchange medium to perform non-contact heat exchange with the high-temperature biochar to reduce the temperature of the biochar, and recovering the waste heat generated during the cooling process through the heat storage station.

[0017] By adopting the above technical solution, the non-contact heat exchange method is used to cool biochar, avoiding the pollution that may be introduced by the direct contact of the cooling medium with the product. At the same time, the sensible heat carried by the high-temperature biochar is recovered through heat exchange, and the waste heat is introduced into the heat storage system. Therefore, not only is the purity of the biochar product guaranteed, but the overall thermal efficiency of the process system is also improved, and the external energy demand is reduced.

[0018] Preferably, in step S6, the heat storage medium used in the heat storage station comprises a high specific heat capacity material formed by sintering TeO3, MgO and SiC.

[0019] By adopting the above technical solution, a high-performance heat storage medium composed of materials such as TeO3, MgO and SiC is used. This medium has a high specific heat capacity and good thermal stability, which can effectively store the intermittent waste heat released during the carbonization and cooling processes, and stably release heat to supply the drying and carbonization processes when needed. Therefore, the cascade utilization and dynamic matching of internal thermal energy of the process are realized, the dependence on external energy is reduced, and the continuity of system operation is enhanced.

[0020] Preferably, in the disinfection process of step S8, high-temperature steam disinfection is used, wherein the disinfection temperature is controlled at 70℃~95℃ and the disinfection time is maintained at 15~30 minutes.

[0021] By adopting the above technical solution, the use of high-temperature steam to pasteurize the vine juice can effectively kill harmful microorganisms such as pathogens and insect eggs carried in the juice under specific temperature and time parameters. For example, downy mildew pathogens or aphid eggs may be present. At the same time, it avoids overheating and destroying the nutrients in the juice, such as vitamins and organic acids. Therefore, it provides a hygienic and safe raw material basis for the subsequent fermentation and preparation of liquid fertilizer, and ensures the biological stability of the liquid fertilizer product.

[0022] Preferably, in the ingredient mixing step S8, one or more of a nitrogen source, a phosphorus source, or a potassium source are added to the sterilized melon vine juice, and humic acid is added; the ratio of the total mass of the added nitrogen source, phosphorus source, or potassium source to the mass of the melon vine juice is controlled at 5% to 15%, and the amount of humic acid added is controlled at 1% to 5% of the mass of the melon vine juice.

[0023] By adopting the above technical solution, by supplementing the juice of melon vines with inorganic nutrients to adjust the carbon-nitrogen ratio to a suitable range for microbial fermentation, and by adding humic acid as a natural composting agent and nutrient carrier, humic acid can chelate nutrient elements and stimulate microbial activity. Therefore, the nutrient balance of the fermentation substrate is optimized, the nutrient content and fertilizer effect of the final liquid fertilizer product are improved, and it is more in line with the needs of crop growth.

[0024] Preferably, in step S8, the fertilizer fermentation specifically involves adding a fermentation agent to the mixed materials for fermentation, wherein the fermentation agent includes at least one of yeast and Bacillus subtilis; and the fermentation temperature is controlled at 25℃~40℃, and the fermentation time is maintained at 7 days~30 days.

[0025] By adopting the above technical solution, due to the inoculation of specific compound microbial agents and the aerobic or facultative anaerobic fermentation under controlled temperature conditions, the microbial community such as yeast and Bacillus subtilis can synergistically decompose the organic matter in the vine juice, producing active ingredients such as organic acids and enzymes. Controlling the fermentation temperature and time ensures the dominant growth and metabolic activities of beneficial microorganisms. Therefore, the vine juice is transformed into a stable liquid fertilizer product rich in easily absorbed nutrients and beneficial microorganisms, thereby improving the biological activity and application effect of the fertilizer.

[0026] In summary, this application has the following beneficial effects: 1. This application adopts an integrated process of crushing, filtration, drying, carbonization, cooling, waste heat recovery, molding and liquid fertilizer fermentation to separately utilize the solid and liquid components in melon vines. The process recovers waste heat from carbonization and cooling through a heat storage station and supplies it to the drying and carbonization stages, reducing overall energy consumption. Therefore, it achieves full utilization of waste melon vines and simultaneously produces high-value-added biochar and agricultural liquid fertilizer.

[0027] 2. In this application, it is preferred to set up a pressure filter separation before drying and use a heat storage station to recover waste heat to supply the carbonization and drying stages. The pressure filter controls the solid content of the wet residue to provide raw materials with suitable moisture content for drying and carbonization, while the waste heat recovery realizes the cascade utilization of waste heat from carbonization and cooling. Therefore, it achieves the effects of improving process energy configuration, reducing external energy demand, and reducing processing costs.

[0028] 3. The method of this application, through the synergistic combination of disinfection treatment of melon vine juice, ingredient mixing and fertilizer fermentation, controls the temperature and time during disinfection to kill harmful microorganisms, and supplements nitrogen, phosphorus, potassium and humic acid in the ingredients to improve the nutrition of the fermentation substrate. At the same time, specific bacterial agents are inoculated and temperature and time are controlled during fermentation. Therefore, the melon vine juice is transformed into a stable liquid fertilizer product rich in easily absorbed nutrients and beneficial microorganisms, thereby improving the biological activity of the fertilizer and the agricultural application effect. Attached Figure Description

[0029] Figure 1 This is a flowchart of a co-production process for producing liquid fertilizer and biomass carbon from waste melon vines, as proposed in this application. Detailed Implementation

[0030] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] Technical concept: In the recycling of agricultural waste, discarded melon peels and vines are made into enzyme liquid fertilizer, which can fully decompose agricultural resource waste. However, the treatment method is relatively simple, only producing liquid fertilizer through fermentation process. It does not separate and diversify the solid and liquid components of the melon vines, and also lacks energy recovery design. As a result, the resource utilization of solid components is insufficient, the overall energy consumption is high, and the efficiency and economic benefits of resource recycling are limited.

[0032] This application discloses a co-production process for producing liquid fertilizer and biochar from waste melon vines. The process includes the following steps: S1, crushing the waste melon vines to obtain crushed melon vines; S2, separating the crushed melon vines by pressure filtration to obtain wet melon vine residue and melon vine juice; S3, drying the wet melon vine residue to obtain dried melon vine material; S4, carbonizing the dried melon vine material to obtain biochar and high-temperature oil gas; S5, cooling the biochar to obtain cooled biochar; S6, recycling the generated waste heat through a heat storage station; S7, molding the cooled biochar to obtain the biochar product; and S8, sequentially disinfecting, mixing, and fermenting the melon vine juice.

[0033] This application adopts an integrated process of crushing, filtration, drying, carbonization, cooling, waste heat recovery, molding, and liquid fertilizer fermentation to separately utilize the solid and liquid components in melon vines. The process recovers waste heat from carbonization and cooling through a heat storage station and supplies it to the drying and carbonization stages, reducing overall energy consumption. Therefore, it achieves full utilization of waste melon vines and simultaneously produces high-value-added biochar and agricultural liquid fertilizer.

[0034] Example 1: This example provides a co-production process for producing liquid fertilizer and biochar from waste melon vines, comprising the following steps: S1. The waste melon vines are crushed to obtain crushed melon vines.

[0035] The crushing length is controlled at 2mm.

[0036] S2. The crushed melon vines obtained in S1 are separated by pressure filtration to obtain wet melon vine residue and melon vine juice.

[0037] The solid content of the wet residue from the melon vines was controlled at 40%.

[0038] S3. The wet residue of melon vines obtained in S2 is dried to obtain dried melon vine material with a moisture content of ≤15%.

[0039] The drying temperature is 80℃ and the drying time is 30 minutes.

[0040] S4. Carbonize the dried melon vines obtained in S3 to obtain biochar and high-temperature oil and gas.

[0041] The pyrolysis temperature is 400℃ and the pyrolysis time is 30 minutes.

[0042] S5. Cool the biochar obtained in S4 to obtain cooled biochar.

[0043] In this process, the temperature of the biomass char is reduced by non-contact heat exchange with the heat exchange medium, and the waste heat generated during the cooling process is recovered through the heat storage station.

[0044] S6. The waste heat generated during the carbonization process of S4 and the waste heat generated during the cooling process of S5 are recycled through the heat storage station and then used to supply the heat for the carbonization process of S4 and the drying process of S3.

[0045] The thermal storage medium used in the thermal storage station includes a high specific heat capacity material made of tellurium trioxide, magnesium oxide and silicon carbide sintered together.

[0046] S7. The cooled biochar is shaped to obtain the biochar product.

[0047] S8. The melon vine juice obtained in S2 is disinfected, mixed with ingredients, and fermented with fertilizer in sequence to obtain agricultural liquid fertilizer.

[0048] During the disinfection process, the disinfection temperature is controlled at 70℃ and the disinfection time is maintained at 15 minutes.

[0049] In the ingredient mixing process, the ratio of the total mass of added nitrogen, phosphorus or potassium sources to the mass of melon vine juice is controlled at 5%, and the amount of humic acid added is controlled at 1% of the mass of melon vine juice.

[0050] In the fertilizer fermentation process, the fermentation agents include yeast and Bacillus subtilis; the fermentation temperature is controlled at 25℃, and the fermentation time is maintained at 7 days.

[0051] Example 2: This example provides a co-production process for producing liquid fertilizer and biochar from waste melon vines, comprising the following steps: S1. The waste melon vines are crushed to obtain crushed melon vines.

[0052] The crushing length is controlled at 5mm.

[0053] S2. The crushed melon vines obtained in S1 are separated by pressure filtration to obtain wet melon vine residue and melon vine juice.

[0054] The solid content of the wet residue from the melon vines was controlled at 50%.

[0055] S3. The wet residue of melon vines obtained in S2 is dried to obtain dried melon vine material with a moisture content of ≤15%.

[0056] The drying temperature is 100℃ and the drying time is 60 minutes.

[0057] S4. Carbonize the dried melon vines obtained in S3 to obtain biochar and high-temperature oil and gas.

[0058] The pyrolysis temperature is 500℃ and the pyrolysis time is 75 minutes.

[0059] S5. Cool the biochar obtained in S4 to obtain cooled biochar.

[0060] In this process, the temperature of the biomass char is reduced by non-contact heat exchange with the heat exchange medium, and the waste heat generated during the cooling process is recovered through the heat storage station.

[0061] S6. The waste heat generated during the carbonization process of S4 and the waste heat generated during the cooling process of S5 are recycled through the heat storage station and then used to supply the heat for the carbonization process of S4 and the drying process of S3.

[0062] The thermal storage medium used in the thermal storage station includes a high specific heat capacity material made of tellurium trioxide, magnesium oxide and silicon carbide sintered together.

[0063] S7. The cooled biochar is shaped to obtain the biochar product.

[0064] S8. The melon vine juice obtained in S2 is disinfected, mixed with ingredients, and fermented with fertilizer in sequence to obtain agricultural liquid fertilizer.

[0065] During the disinfection process, the disinfection temperature is controlled at 85℃ and the disinfection time is maintained at 20 minutes.

[0066] In the ingredient mixing process, the ratio of the total mass of added nitrogen, phosphorus or potassium sources to the mass of melon vine juice is controlled at 10%, and the amount of humic acid added is controlled at 3% of the mass of melon vine juice.

[0067] In the fertilizer fermentation process, the fermentation agents include yeast and Bacillus subtilis; the fermentation temperature is controlled at 30℃, and the fermentation time is maintained at 15 days.

[0068] Example 3: This example provides a co-production process for producing liquid fertilizer and biochar from waste melon vines, comprising the following steps: S1. The waste melon vines are crushed to obtain crushed melon vines.

[0069] The crushing length is controlled at 10mm.

[0070] S2. The crushed melon vines obtained in S1 are separated by pressure filtration to obtain wet melon vine residue and melon vine juice.

[0071] The solid content of the wet residue from the melon vines was controlled to be 60%.

[0072] S3. The wet residue of melon vines obtained in S2 is dried to obtain dried melon vine material with a moisture content of ≤15%.

[0073] The drying temperature is 120℃ and the drying time is 90 minutes.

[0074] S4. Carbonize the dried melon vines obtained in S3 to obtain biochar and high-temperature oil and gas.

[0075] The pyrolysis temperature is 600℃ and the pyrolysis time is 120 minutes.

[0076] S5. Cool the biochar obtained in S4 to obtain cooled biochar.

[0077] In this process, the temperature of the biomass char is reduced by non-contact heat exchange with the heat exchange medium, and the waste heat generated during the cooling process is recovered through the heat storage station.

[0078] S6. The waste heat generated during the carbonization process of S4 and the waste heat generated during the cooling process of S5 are recycled through the heat storage station and then used to supply the heat for the carbonization process of S4 and the drying process of S3.

[0079] The thermal storage medium used in the thermal storage station includes a high specific heat capacity material made of tellurium trioxide, magnesium oxide and silicon carbide sintered together.

[0080] S7. The cooled biochar is shaped to obtain the biochar product.

[0081] S8. The melon vine juice obtained in S2 is disinfected, mixed with ingredients, and fermented with fertilizer in sequence to obtain agricultural liquid fertilizer.

[0082] During the disinfection process, the disinfection temperature is controlled at 95℃ and the disinfection time is maintained at 30 minutes.

[0083] In the ingredient mixing process, the ratio of the total mass of added nitrogen, phosphorus or potassium sources to the mass of melon vine juice is controlled at 15%, and the amount of humic acid added is controlled at 5% of the mass of melon vine juice.

[0084] In the fertilizer fermentation process, the fermentation agents include yeast and Bacillus subtilis; the fermentation temperature is controlled at 40℃, and the fermentation time is maintained at 30 days.

[0085] Comparative Example 1: This comparative example refers to the content of Example 1, except that the crushing length in S1 is controlled at 1.2 mm, and the rest is the same as Example 1.

[0086] Comparative Example 2: This comparative example refers to the content of Example 1, except that the solid content of the wet residue of the melon vine is controlled at 24% in S2, and the rest of the content is the same as that of Example 1.

[0087] Comparative Example 3: This comparative example refers to the content of Example 1, except that the drying temperature in S3 is controlled at 48°C, and the rest is the same as Example 1.

[0088] Comparative Example 4: This comparative example refers to the content of Example 1, except that the pyrolysis temperature in S4 is controlled at 240°C, and the rest is the same as Example 1.

[0089] Comparative Example 5: This comparative example refers to the content of Example 1, except that the disinfection temperature in S8 is controlled at 42°C, and the rest is the same as Example 1.

[0090] Comparative Example 6: This comparative example refers to the content of Example 1, except that the fertilizer fermentation temperature in S8 is controlled at 15°C, and the rest is the same as Example 1.

[0091] Performance testing Sample preparation: The test samples were prepared according to the process conditions described in Examples 1-3 and Comparative Examples 1-6 respectively; 100 kg of waste melon vines were taken from each group of experiments and processed according to the specific parameters of the corresponding examples or comparative examples to finally obtain biochar products and agricultural liquid fertilizer products; all samples were stored under the same environmental conditions to ensure the comparability of the results.

[0092] Process energy self-sufficiency rate detection: Through an online monitoring and metering system, the total amount of waste heat released in the carbonization and biochar cooling stages is recorded, as well as the total amount of heat energy actually used to supply the drying and carbonization stages after being recovered by the thermal storage station. Finally, the proportion of recovered and utilized heat energy to the total process heat energy demand is calculated, i.e., the energy self-sufficiency rate. This proportion reflects the degree to which the process reduces external energy demand.

[0093] Biomass carbon product performance testing: First, the biomass carbon yield is determined, which is the percentage of the mass of the obtained biomass carbon to the mass of the dry melon vines input; then, the physicochemical properties of the biomass carbon product are analyzed, including the determination of its fixed carbon content, ash content and pH value; the determination of biomass carbon yield and fixed carbon content is carried out in accordance with the relevant provisions in the agricultural industry standard "Biomass Charcoal".

[0094] Nutrient and bioactivity testing of agricultural liquid fertilizers: First, key nutrient indicators in the liquid fertilizer are measured, including the content of total nitrogen, available phosphorus, available potassium, and humic acid. At the same time, microbiological testing is performed on the liquid fertilizer product, and the total number of colonies of active beneficial microorganisms is determined by plate counting to assess its bioactivity. The determination of nutrient content follows the methods in the national standard "Water-soluble Fertilizers", and the determination of the number of viable microorganisms follows the relevant provisions in the national standard "Microbial Fertilizers".

[0095] The resource utilization rate of melon vines is tested by weighing the total mass of the initial waste melon vines, the mass of the final biomass carbon product, and the total mass of the agricultural liquid fertilizer product. The resource utilization rate is the percentage of the total mass of the final product to the total mass of the raw materials input. This indicator comprehensively reflects the efficiency of the process in converting waste into useful products.

[0096] Table 1: Product Quality Indicators

[0097] Table 2: Process Performance Indicators

[0098] Example Conclusion: As can be seen from Examples 1-3 and Comparative Example 1, and from Tables 1 and 2, controlling the crushing length within a suitable range helps to form a material structure that is conducive to pressure filtration, thereby ensuring the efficiency of subsequent solid-liquid separation and the quality of juice and wet residue, laying a good material foundation for obtaining high-quality biochar and highly active liquid fertilizer.

[0099] Based on Examples 1-3 and Comparative Example 2, and in conjunction with Table 2, it can be seen that controlling the solid content of the wet residue from the melon vines after pressure filtration within a relatively high range can reduce the moisture content in the wet residue, thereby reducing the energy consumption load of the subsequent drying process.

[0100] As can be seen from Examples 1-3 and Comparative Example 3, and from Tables 1 and 2, using a sufficiently high drying temperature can reduce the moisture content of the wet residue to a level suitable for carbonization. This not only provides stable raw materials for the carbonization stage, ensuring the yield and quality of biochar, but also makes it easier to match and balance the heat energy demand and waste heat recovery supply of the entire process.

[0101] As can be seen from Examples 1-3 and Comparative Example 4, and Table 1, the improved pyrolysis temperature can help achieve efficient and stable carbonization of biomass; a suitable temperature can promote the directional conversion of organic matter into biochar with high fixed carbon content, rather than remaining in an incomplete pyrolysis state at low temperatures, thereby ensuring that the biochar product has high stability and agricultural value.

[0102] As can be seen from Examples 1-3 and Comparative Example 5, and Table 1, disinfecting the vine juice can ensure the subsequent targeted fertilizer fermentation. Disinfection can eliminate or inhibit miscellaneous bacteria and harmful microorganisms in the raw materials, creating a favorable growth environment for the subsequent addition of beneficial fermentation agents, thereby ensuring the bioactivity and safety of the liquid fertilizer product.

[0103] As can be seen from Examples 1-3 and Comparative Example 6, and Table 1, controlling the fermentation temperature within a suitable range can activate and maintain the high metabolic activity of the fermentation agent. The suitable fermentation temperature is conducive to the rapid proliferation and efficient metabolism of microorganisms, thereby decomposing and transforming the organic matter in the juice and synthesizing active substances, ultimately obtaining a high-quality liquid fertilizer product with improved nutrient form and high biological activity.

[0104] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A co-production process for producing liquid fertilizer and biochar from waste melon vines, characterized in that, Includes the following steps: S1. The waste melon vines are crushed to obtain crushed melon vines; S2. The crushed melon vines obtained in S1 are separated by pressure filtration to obtain wet melon vine residue and melon vine juice; S3. The wet residue of melon vines obtained in S2 is dried to obtain dried melon vine material with a moisture content of ≤15%; S4. Carbonize the dried melon vines obtained in S3 to obtain biochar and high-temperature oil and gas. S5. Cool the biochar obtained in S4 to obtain cooled biochar. S6. The waste heat generated during the carbonization process of S4 and the waste heat generated during the cooling process of S5 are recycled through the heat storage station and then used to supply the heat for the carbonization process of S4 and the drying process of S3. S7. The cooled biochar is shaped to obtain biochar products. S8. The melon vine juice obtained in S2 is disinfected, mixed with ingredients, and fermented with fertilizer in sequence to obtain agricultural liquid fertilizer.

2. The co-production process for producing liquid fertilizer and biomass carbon from waste melon vines according to claim 1, characterized in that, In step S1, the pulverization process controls the pulverization length of the melon vines to be ≤10mm.

3. The co-production process for producing liquid fertilizer and biomass carbon from waste melon vines according to claim 1, characterized in that, In step S2, the solid content of the wet residue of melon vines obtained after pressure filtration is controlled to be 40% to 60%.

4. The co-production process for producing liquid fertilizer and biomass carbon from waste melon vines according to claim 1, characterized in that, In step S3, the drying temperature is 80℃~120℃ and the drying time is 30~90 minutes.

5. The co-production process for producing liquid fertilizer and biomass carbon from waste melon vines according to claim 1, characterized in that, In step S4, the carbonization process is performed by negative pressure combustion pyrolysis at a temperature of 400℃ to 600℃ for 30 to 120 minutes.

6. The co-production process for producing liquid fertilizer and biomass carbon from waste melon vines according to claim 1, characterized in that, In step S5, the cooling process specifically involves: using a heat exchange medium to perform non-contact heat exchange with the high-temperature biochar to reduce the temperature of the biochar, and recovering the waste heat generated during the cooling process through the heat storage station.

7. The co-production process for producing liquid fertilizer and biomass carbon from waste melon vines according to claim 1, characterized in that, In step S6, the heat storage medium used in the heat storage station comprises a high specific heat capacity material formed by sintering TeO3, MgO and SiC.

8. The co-production process for producing liquid fertilizer and biomass carbon from waste melon vines according to claim 1, characterized in that, In the disinfection process of step S8, high-temperature steam disinfection is used, with the disinfection temperature controlled between 70℃ and 95℃ and the disinfection time maintained between 15 and 30 minutes.

9. The co-production process for producing liquid fertilizer and biomass carbon from waste melon vines according to claim 1, characterized in that, In the ingredient mixing process of step S8, one or more of nitrogen, phosphorus, or potassium sources are added to the sterilized melon vine juice, along with humic acid. The ratio of the total mass of the added nitrogen, phosphorus, or potassium sources to the mass of the melon vine juice is controlled at 5% to 15%, and the amount of humic acid added is controlled at 1% to 5% of the mass of the melon vine juice.

10. The co-production process for producing liquid fertilizer and biomass carbon from waste melon vines according to claim 1, characterized in that, In step S8, fertilizer fermentation specifically involves adding a fermentation agent to the mixed materials for fermentation. The fermentation agent includes at least one of yeast and Bacillus subtilis. The fermentation temperature is controlled between 25°C and 40°C, and the fermentation time is maintained between 7 and 30 days.

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