Process for the preparation of biomass fuels using musk-t high polymers

Abstract

The present application provides a method for preparing biomass fuel by using musk-T high polymer. The method comprises the following steps: crushing the musk-T high polymer; pretreating, alkali treating and enzymolysis treating the biomass material; mixing the high polymer powder, the enzymolysis treated biomass material and a combustion improver to obtain a mixture; and finally pressing and cutting the mixture to obtain the biomass fuel in the form of particles. The musk-T high polymer biomass fuel prepared by the method has the advantages that the exhaust gas after combustion is mainly carbon dioxide and water, the ash produced by combustion is mainly mineral salts and oxides such as sodium carbonate, magnesium sulfate, aluminum oxide, aluminum phosphate, potassium carbonate and calcium oxide, and the ash produced by combustion can be used as a fertilizer. Therefore, the musk-T high polymer is suitable to be used as a biomass fuel, and the recycling of the high polymer has the advantages of economy and environmental protection.

Description

Technical Field

[0001] This invention relates to the field of biomass fuel preparation, and more specifically, to a method for preparing biomass fuel using musk-T polymer. Background Technology

[0002] Synthetic musk fragrances are classified into three types: nitro musk, polycyclic musk, and macrocyclic musk. Currently, nitro musk is the most widely used globally, accounting for approximately 50%, and is characterized by its ease of synthesis and low cost. Polycyclic musk is the second most used, accounting for about 45% of the total. Natural macrocyclic musk, due to its high synthesis difficulty and limited raw material sources, accounts for only about 5% of the total. Because macrocyclic musk is the main component of natural musk, has stable properties, and is non-toxic, research on macrocyclic musk has reached a fever pitch.

[0003] Ethylene tridecanoate diester (trade name: Musk-T), a next-generation product, is the most economical macrocyclic musk. Ethylene tridecanoate diester has a sweet musky aroma, strong fixative properties, stable fragrance, and good diffusion. In fragrances, it enhances, rounds, and improves the overall aroma performance, making it an indispensable raw material for blending high-grade fragrances. The Musk-T polymer obtained during its production can be used as biomass fuel. Biomass fuel refers to the combustion of biomass materials as fuel. Biomass materials are materials derived from living organisms such as animals, plants, and microorganisms, mainly composed of organic polymers. Chemically, biomass is primarily composed of carbon, hydrogen, and oxygen. The combustion exhaust gas produced by musk-T polymer is mainly carbon dioxide and water, and the ash produced is mainly mineral salts and oxides such as sodium carbonate, magnesium sulfate, aluminum oxide, aluminum phosphate, potassium carbonate and calcium oxide. The ash produced can be used as fertilizer. Therefore, musk-T polymer is suitable as a biomass fuel. The recycling of polymer has important economic and environmental characteristics. Summary of the Invention

[0004] This invention provides a method for preparing biomass fuel using musk-T polymer. The polymer obtained from the musk-T production line is mixed with biomass materials to prepare biomass fuel. The recycling of the polymer is an economical and environmentally friendly application.

[0005] To address the aforementioned technical problems, this invention provides a method for preparing biomass fuel using musk-T polymer, comprising the following steps:

[0006] S1: Polymer Pretreatment

[0007] 15-25 parts of the polymer are pulverized and passed through a 20-mesh sieve to obtain polymer powder;

[0008] S2: Biomass material pretreatment

[0009] Crush 20-60 parts of corn stalks, 20-60 parts of rice stalks and 20-60 parts of sawdust to 30-50 mesh, mix them together to obtain mixture A;

[0010] S3: Alkali treatment

[0011] Mixture A was treated with an aqueous sodium hydroxide solution;

[0012] S4: Enzymatic hydrolysis

[0013] The alkali-treated mixture A was enzymatically hydrolyzed with hydrolyzing enzyme;

[0014] S5: Drying

[0015] The enzymatically hydrolyzed mixture A is dried at a low temperature, maintaining the drying temperature at 40-60℃;

[0016] S6: Hybrid

[0017] Mix 15-25 parts of polymer powder, 60-180 parts of dried mixture A, and 0.9-1.5 parts of combustion improver evenly to obtain mixture B;

[0018] S7: Granulation

[0019] The mixture B is pressed and cut to obtain the biomass fuel in granular form.

[0020] Furthermore, the polymer in step S1 is a byproduct obtained during the preparation of musk-T;

[0021] The preparation process of the musk-T includes the following steps:

[0022] ① Raw material preparation: Prepare 250-300 parts of tridecanoic acid and 80-100 parts of ethylene glycol;

[0023] ② Polymerization reaction: Add 250-300 parts of tridecanoic acid to a 1000L stainless steel polymerization reactor, add 80-100 parts of ethylene glycol, control the temperature at 150-160℃, react for 4-6 hours, then distill to recover about 20-30 parts of ethylene glycol, to obtain 310-370 parts of crude product from the polymerization reaction, which can be directly used as raw material in the next step of the reaction;

[0024] ③ Depolymerization reaction: Place 310-370 parts of the crude product obtained in step ② into two 500L stainless steel depolymerization reactors, add 2-4 parts of catalyst to each reactor. The catalyst is composed of inorganic salts such as sodium carbonate, alumina, and magnesium sulfate. Raise the temperature to 280-320℃ and depolymerize under vacuum for 5-8 hours to obtain 285-300 parts of musk-T crude product and 15-25 parts of polymer.

[0025] ④ Flash evaporation: Place 285-300 parts of the crude musk-T product obtained in step ③ into a 3000L stainless steel fractionating kettle, and carry out crude evaporation under a vacuum of 2000-4000Pa and a temperature of 180-210℃ to obtain 275-285 parts of musk-T product. The remaining polyester after flash evaporation is put back into the depolymerization reaction and recycled continuously.

[0026] ⑤ Fractionation: 275-285 parts of musk-T product obtained in step ④ are fed into a 2000L fractionation kettle for distillation. Under vacuum, the temperature is controlled at 180-220℃ to obtain 250-270 parts of musk-T finished product. The remaining polyester after distillation is put back into the depolymerization process for recycling.

[0027] Further, step S1 includes the following steps:

[0028] S1.1: First, spread the polymer obtained in the preparation process of musk-T on a cool and ventilated ground, turn it over every 15-30 minutes, and let the polymer cool naturally.

[0029] S1.2: Spread the cooled polymer evenly on the sieve plate in the dryer;

[0030] S1.3: Continuously move the sieve plate to make the clumped polymer shake and spread it more evenly;

[0031] S1.4: Preheated hot air is introduced into the dryer to dry the polymer on the sieve plate until the moisture content is 15-20 wt%.

[0032] S1.5: The dried polymer is put into a pulverizer for pulverization to obtain polymer powder that passes through a 20-mesh sieve.

[0033] Further, step S2 includes the following steps:

[0034] S2.1: Dry 20-60 parts of corn stalks, 20-60 parts of rice stalks and 20-60 parts of sawdust until the moisture content is ≤12wt%.

[0035] S2.2: The dried corn stalks, rice stalks and sawdust are crushed to obtain corn stalk powder, rice stalk powder and sawdust powder, and then passed through a 30-50 mesh sieve;

[0036] S2.3: Mix corn stalk powder, rice stalk powder and sawdust powder in a ratio of 1:1:1 to obtain mixture A.

[0037] Furthermore, step S3 includes the following steps:

[0038] S3.1: Mix mixture A with 10-20wt% sodium hydroxide aqueous solution at a ratio of 1:5-10 to obtain mixture I;

[0039] S3.2: Heat mixture I to 65-80℃ and maintain for 5-8 hours;

[0040] S3.3: Filter the heated mixture I again and keep the filter residue for later use;

[0041] S3.4: Wash the filter residue with clean water 3-5 times to obtain the alkali-treated mixture A.

[0042] Further, step S4 includes the following steps:

[0043] S4.1: Immerse the alkali-treated mixture A in the enzymatic hydrolysis solution at a material-to-liquid ratio of 1:8-15, adjust the pH value to 5-7, and enzymatically hydrolyze for 5-8 hours at a temperature of 35-50℃.

[0044] S4.2: Filter the solution after enzymatic hydrolysis in step S4.1 and keep the filter residue for later use;

[0045] S4.3: Wash the filter residue with clean water 3-5 times to obtain the enzymatically hydrolyzed mixture A.

[0046] Furthermore, the combustion aid in step S6 is composed of black shale, potassium chlorate, industrial salt, charcoal and manganese dioxide in a ratio of (7-9):(7-9):(0.5-1.5):(1-3):(0.5-1.5).

[0047] Furthermore, in step S7, the size of the biomass fuel compression mold is (2-3) mm × (2-3) mm × (2-3) mm.

[0048] Furthermore, in step S7, the pressing process is carried out in two stages. The pressure of the first pressing is 15-25 MPa and the pressing time is 15-20 min. The pressure of the second pressing is 30-40 MPa and the pressing time is 15-25 min.

[0049] The advantages and beneficial effects of this invention are as follows:

[0050] 1. The musk-T polymer biomass fuel prepared by this invention produces mainly carbon dioxide and water as exhaust gas after combustion. The ash produced by combustion mainly consists of mineral salts and oxides such as sodium carbonate, magnesium sulfate, aluminum oxide, aluminum phosphate, potassium carbonate, and calcium oxide. The ash produced by combustion can be used as fertilizer. Therefore, musk-T polymer is suitable as a biomass fuel, and the recycling of the polymer has economical and environmentally friendly applications.

[0051] 2. In the process of pulverizing the polymer in the musk-T production line, the present invention continuously moves the sieve plate, causing the agglomerated polymer to shake and spread more evenly, thus improving the drying effect of the polymer.

[0052] 3. Adding combustion improvers to the mixture of polymers and biomaterials can improve the combustion efficiency of biomass fuels.

[0053] 4. During the pressing process, the biomass fuel is pressed twice, resulting in a solid texture, dense structure, strong adhesion, and good durability, thus extending the combustion time of the biomass fuel. Attached Figure Description

[0054] Figure 1 This is a flowchart of the method for preparing biomass fuel used in an embodiment of the present invention.

[0055] Figure 2 This is a diagram showing the raw material ratios used in the preparation of biomass fuel in this embodiment of the invention. Detailed Implementation

[0056] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is further described in conjunction with specific embodiments. However, this invention is not limited to these embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. In this invention, unless otherwise specified, all parts and percentages are units of mass, and the equipment and raw materials used are commercially available or commonly used in the art. Unless otherwise specified, the methods in the following embodiments are conventional methods in the art. Example 1

[0057] A method for preparing biomass fuel using musk-T polymer, such as Figures 1-2 As shown, it includes the following steps:

[0058] S1: Polymer Pretreatment

[0059] First, the polymer obtained in the preparation process of musk-T is spread evenly on a cool and ventilated ground. It is turned over every 15 minutes to allow the polymer to cool naturally, which increases the cooling speed. The cooled polymer is then spread evenly on the sieve plate in the dryer. The sieve plate is moved continuously to shake the clumps of polymer and spread it more evenly, which makes the polymer dry more evenly. Preheated hot air is sent into the dryer to dry the polymer on the sieve plate until the moisture content is 15 wt%. 15 portions of the dried polymer are put into a pulverizer for pulverization to obtain polymer powder that passes through a 20-mesh sieve.

[0060] S2: Biomass material pretreatment

[0061] 20 parts corn stalks, 20 parts rice stalks, and 20 parts sawdust were dried until the moisture content was ≤12wt%. The dried corn stalks, rice stalks, and sawdust were then pulverized to obtain corn stalk powder, rice stalk powder, and sawdust powder, which were then passed through a 40-mesh sieve. The corn stalk powder, rice stalk powder, and sawdust powder were then mixed in a 1:1:1 ratio to obtain mixture A.

[0062] S3: Alkali treatment

[0063] Mixture A and 12wt% sodium hydroxide aqueous solution are mixed evenly in a ratio of 1:6 to obtain mixture I. Mixture I is heated to 70℃ and maintained for 6 hours. Then, the heated mixture I is filtered and the filter residue is kept for later use. The filter residue is washed 5 times with clean water to obtain alkali-treated mixture A. The utilization rate of straw is improved after alkali treatment.

[0064] S4: Enzymatic hydrolysis

[0065] The alkali-treated mixture A was immersed in the enzymatic hydrolysate at a ratio of 1:12, the pH was adjusted to 6, and the mixture was enzymatically hydrolyzed at 40℃ for 6 hours. The hydrolyzed solution was filtered, and the filter residue was kept for later use. The filter residue was washed 5 times with clean water to obtain the enzymatically hydrolyzed mixture A.

[0066] S5: Drying

[0067] The enzymatically hydrolyzed mixture A was dried at a low temperature, with the drying temperature maintained at 50℃.

[0068] S6: Hybrid

[0069] Mix 15 parts of polymer powder, 60 parts of dried mixture A, and 1.2 parts of combustion aid evenly. The combustion aid is composed of black shale, potassium chlorate, industrial salt, charcoal, and manganese dioxide in a ratio of 8:8:1:2:1 to obtain mixture B.

[0070] S7: Granulation

[0071] When pressing mixture B, it is pressed twice. The first pressing pressure is 20MPa and the pressing time is 15min. The second pressing pressure is 35MPa and the pressing time is 25min. The pressing mold size is 3mm×3mm×3mm. Then it is cut to obtain the biomass fuel in pellet form.

[0072] Furthermore, the polymer in step S1 is a byproduct obtained during the preparation of musk-T;

[0073] The preparation process of the musk-T includes the following steps:

[0074] ① Raw material preparation: Prepare 250 parts of tridecanoic acid and 80 parts of ethylene glycol;

[0075] ② Polymerization reaction: 250 parts of tridecanoic acid were added to a 1000L stainless steel polymerization reactor, and 80 parts of ethylene glycol were added. The temperature was controlled at 150℃. After 6 hours of reaction, the water generated in the reaction was distilled out through the gas phase outlet pipe at the top of the reactor. After condensation, it entered the polymerization receiving tank. About 20 parts of ethylene glycol were recovered by distillation, and 310 parts of crude product from the polymerization reaction were obtained, which was directly used as raw material in the next step of the reaction.

[0076] ③ Depolymerization reaction: The 310 parts of crude product obtained in step ② were placed into two 500L stainless steel depolymerization reactors. Three parts of catalyst were added to each reactor. The catalyst was composed of inorganic salts such as sodium carbonate, alumina, and magnesium sulfate. The temperature was raised to 290℃ and the depolymerization reaction was carried out under vacuum for 6 hours to obtain 285 parts of musk-T crude product and 15-25 parts of polymer.

[0077] ④ Flash evaporation: The 285 parts of the crude musk-T product obtained in step ③ are placed into a 3000L stainless steel fractionating kettle. Under a vacuum of 2000Pa and a temperature of 180℃, crude evaporation is carried out to obtain 275 parts of musk-T product. The remaining polyester after flash evaporation is put back into the depolymerization reaction and recycled continuously.

[0078] ⑤ Fractionation: The 275 parts of musk-T product obtained in step ④ are fed into a 2000L fractionation kettle for distillation. Under vacuum, the temperature is controlled at 180℃ to obtain 250 parts of musk-T finished product. The remaining polyester after distillation is put back into the depolymerization process for recycling. Example 2

[0079] A method for preparing biomass fuel using musk-T polymer, such as Figures 1-2 As shown, it includes the following steps:

[0080] S1: Polymer Pretreatment

[0081] First, the polymer obtained in the preparation process of musk-T is spread evenly on a cool and ventilated ground. It is turned over every 15 minutes to allow the polymer to cool naturally, which increases the cooling speed. The cooled polymer is then spread evenly on the sieve plate in the dryer. The sieve plate is moved continuously to shake the clumps of polymer and spread it more evenly, which makes the polymer dry more evenly. Preheated hot air is sent into the dryer to dry the polymer on the sieve plate until the moisture content is 15-20 wt%. 15 parts of the dried polymer are put into a pulverizer for pulverization to obtain polymer powder that passes through a 20-mesh sieve.

[0082] S2: Biomass material pretreatment

[0083] 30 parts corn stalks, 30 parts rice stalks, and 30 parts sawdust were dried until the moisture content was ≤12wt%. The dried corn stalks, rice stalks, and sawdust were then pulverized to obtain corn stalk powder, rice stalk powder, and sawdust powder, which were then passed through a 40-mesh sieve. The corn stalk powder, rice stalk powder, and sawdust powder were then mixed in a 1:1:1 ratio to obtain mixture A.

[0084] S3: Alkali treatment

[0085] Mixture A and 12wt% sodium hydroxide aqueous solution are mixed evenly in a ratio of 1:6 to obtain mixture I. Mixture I is heated to 70℃ and maintained for 6 hours. Then, the heated mixture I is filtered and the filter residue is kept for later use. The filter residue is washed 5 times with clean water to obtain alkali-treated mixture A. The utilization rate of straw is improved after alkali treatment.

[0086] S4: Enzymatic hydrolysis

[0087] The alkali-treated mixture A was immersed in the enzymatic hydrolysate at a ratio of 1:12, the pH was adjusted to 6, and the mixture was enzymatically hydrolyzed at 40℃ for 6 hours. The hydrolyzed solution was filtered, and the filter residue was kept for later use. The filter residue was washed 5 times with clean water to obtain the enzymatically hydrolyzed mixture A.

[0088] S5: Drying

[0089] The enzymatically hydrolyzed mixture A was dried at a low temperature, with the drying temperature maintained at 50℃.

[0090] S6: Hybrid

[0091] Mix 15 parts of polymer powder, 90 parts of dried mixture A, and 1.2 parts of combustion aid evenly. The combustion aid is composed of black shale, potassium chlorate, industrial salt, charcoal, and manganese dioxide in a ratio of 8:8:1:2:1 to obtain mixture B.

[0092] S7: Granulation

[0093] When pressing mixture B, it is pressed twice. The first pressing pressure is 20MPa and the pressing time is 15min. The second pressing pressure is 35MPa and the pressing time is 25min. The pressing mold size is 3mm×3mm×3mm. Then it is cut to obtain the biomass fuel in pellet form.

[0094] Furthermore, the polymer in step S1 is a byproduct obtained during the preparation of musk-T;

[0095] The preparation process of the musk-T includes the following steps:

[0096] ① Raw material preparation: Prepare 250 parts of tridecanoic acid and 80 parts of ethylene glycol;

[0097] ② Polymerization reaction: 250 parts of tridecanoic acid were added to a 1000L stainless steel polymerization reactor, and 80 parts of ethylene glycol were added. The temperature was controlled at 150℃. After 6 hours of reaction, the water generated in the reaction was distilled out through the gas phase outlet pipe at the top of the reactor. After condensation, it entered the polymerization receiving tank. About 20 parts of ethylene glycol were recovered by distillation, and 310 parts of crude product from the polymerization reaction were obtained, which was directly used as raw material in the next step of the reaction.

[0098] ③ Depolymerization reaction: The 310 parts of crude product obtained in step ② were placed into two 500L stainless steel depolymerization reactors. Three parts of catalyst were added to each reactor. The catalyst was composed of inorganic salts such as sodium carbonate, alumina, and magnesium sulfate. The temperature was raised to 290℃ and the depolymerization reaction was carried out under vacuum for 6 hours to obtain 285 parts of musk-T crude product and 15-25 parts of polymer.

[0099] ④ Flash evaporation: The 285 parts of the crude musk-T product obtained in step ③ are placed into a 3000L stainless steel fractionating kettle. Under a vacuum of 2000Pa and a temperature of 180℃, crude evaporation is carried out to obtain 275 parts of musk-T product. The remaining polyester after flash evaporation is put back into the depolymerization reaction and recycled continuously.

[0100] ⑤ Fractionation: The 275 parts of musk-T product obtained in step ④ are fed into a 2000L fractionation kettle for distillation. Under vacuum, the temperature is controlled at 180℃ to obtain 250 parts of musk-T finished product. The remaining polyester after distillation is put back into the depolymerization process for recycling. Example 3

[0101] A method for preparing biomass fuel using musk-T polymer, such as Figures 1-2 As shown, it includes the following steps:

[0102] S1: Polymer Pretreatment

[0103] First, the polymer obtained in the preparation process of musk-T is spread evenly on a cool and ventilated ground. It is turned over every 15 minutes to allow the polymer to cool naturally, which increases the cooling speed. The cooled polymer is then spread evenly on the sieve plate in the dryer. The sieve plate is moved continuously to shake the clumps of polymer and spread it more evenly, which makes the polymer dry more evenly. Preheated hot air is sent into the dryer to dry the polymer on the sieve plate until the moisture content is 15-20 wt%. 15 parts of the dried polymer are put into a pulverizer for pulverization to obtain polymer powder that passes through a 20-mesh sieve.

[0104] S2: Biomass material pretreatment

[0105] 40 parts of corn stalks, 40 parts of rice stalks, and 40 parts of sawdust were dried until the moisture content was ≤12wt%. The dried corn stalks, rice stalks, and sawdust were then pulverized to obtain corn stalk powder, rice stalk powder, and sawdust powder, which were then passed through a 40-mesh sieve. The corn stalk powder, rice stalk powder, and sawdust powder were then mixed in a 1:1:1 ratio to obtain mixture A.

[0106] S3: Alkali treatment

[0107] Mixture A and 12wt% sodium hydroxide aqueous solution are mixed evenly in a ratio of 1:6 to obtain mixture I. Mixture I is heated to 70℃ and maintained for 6 hours. Then, the heated mixture I is filtered and the filter residue is kept for later use. The filter residue is washed 5 times with clean water to obtain alkali-treated mixture A. The utilization rate of straw is improved after alkali treatment.

[0108] S4: Enzymatic hydrolysis

[0109] The alkali-treated mixture A was immersed in the enzymatic hydrolysate at a ratio of 1:12, the pH was adjusted to 6, and the mixture was enzymatically hydrolyzed at 40℃ for 6 hours. The hydrolyzed solution was filtered, and the filter residue was kept for later use. The filter residue was washed 5 times with clean water to obtain the enzymatically hydrolyzed mixture A.

[0110] S5: Drying

[0111] The enzymatically hydrolyzed mixture A was dried at a low temperature, with the drying temperature maintained at 50℃.

[0112] S6: Hybrid

[0113] Mix 15 parts of polymer powder, 120 parts of dried mixture A, and 1.2 parts of combustion aid evenly. The combustion aid is composed of black shale, potassium chlorate, industrial salt, charcoal, and manganese dioxide in a ratio of 8:8:1:2:1 to obtain mixture B.

[0114] S7: Granulation

[0115] When pressing mixture B, it is pressed twice. The first pressing pressure is 20MPa and the pressing time is 15min. The second pressing pressure is 35MPa and the pressing time is 25min. The pressing mold size is 3mm×3mm×3mm. Then it is cut to obtain the biomass fuel in pellet form.

[0116] Furthermore, the polymer in step S1 is a byproduct obtained during the preparation of musk-T;

[0117] The preparation process of the musk-T includes the following steps:

[0118] ① Raw material preparation: Prepare 250 parts of tridecanoic acid and 80 parts of ethylene glycol;

[0119] ② Polymerization reaction: 250 parts of tridecanoic acid were added to a 1000L stainless steel polymerization reactor, and 80 parts of ethylene glycol were added. The temperature was controlled at 150℃. After 6 hours of reaction, the water generated in the reaction was distilled out through the gas phase outlet pipe at the top of the reactor. After condensation, it entered the polymerization receiving tank. About 20 parts of ethylene glycol were recovered by distillation, and 310 parts of crude product from the polymerization reaction were obtained, which was directly used as raw material in the next step of the reaction.

[0120] ③ Depolymerization reaction: The 310 parts of crude product obtained in step ② were placed into two 500L stainless steel depolymerization reactors. Three parts of catalyst were added to each reactor. The catalyst was composed of inorganic salts such as sodium carbonate, alumina, and magnesium sulfate. The temperature was raised to 290℃ and the depolymerization reaction was carried out under vacuum for 6 hours to obtain 285 parts of musk-T crude product and 15-25 parts of polymer.

[0121] ④ Flash evaporation: The 285 parts of the crude musk-T product obtained in step ③ are placed into a 3000L stainless steel fractionating kettle. Under a vacuum of 2000Pa and a temperature of 180℃, crude evaporation is carried out to obtain 275 parts of musk-T product. The remaining polyester after flash evaporation is put back into the depolymerization reaction and recycled continuously.

[0122] ⑤ Fractionation: The 275 parts of musk-T product obtained in step ④ are fed into a 2000L fractionation kettle for distillation. Under vacuum, the temperature is controlled at 180℃ to obtain 250 parts of musk-T finished product. The remaining polyester after distillation is put back into the depolymerization process for recycling.

[0123] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for preparing biomass fuel using musk-T polymer, characterized in that, Includes the following steps: S1: Polymer Pretreatment 15-25 parts of the polymer are pulverized and passed through a 20-mesh sieve to obtain polymer powder; S2: Biomass material pretreatment Crush 20-60 parts of corn stalks, 20-60 parts of rice stalks and 20-60 parts of sawdust to 30-50 mesh, mix them together to obtain mixture A; S3: Alkali treatment Mixture A was treated with an aqueous sodium hydroxide solution; S4: Enzymatic hydrolysis The alkali-treated mixture A was enzymatically hydrolyzed with hydrolyzing enzyme; S5: Drying The enzymatically hydrolyzed mixture A is dried at a low temperature, maintaining the drying temperature at 40-60℃; S6: Hybrid Mix 15-25 parts of polymer powder, 60-180 parts of dried mixture A, and 0.9-1.5 parts of combustion improver evenly to obtain mixture B; S7: Granulation The mixture B is pressed and cut to obtain the biomass fuel in granular form; Step S1 includes the following steps: S1.1: First, spread the polymer obtained in the preparation process of musk-T on a cool and ventilated ground, turn it over every 15-30 minutes, and let the polymer cool naturally. S1.2: Spread the cooled polymer evenly on the sieve plate in the dryer; S1.3: Continuously move the sieve plate to make the clumped polymer shake and spread it more evenly; S1.4: Preheated hot air is introduced into the dryer to dry the polymer on the sieve plate until the moisture content is 15-20 wt%. S1.5: The dried polymer is put into a pulverizer for pulverization to obtain polymer powder that passes through a 20-mesh sieve; The combustion aid in step S6 is composed of black shale, potassium chlorate, industrial salt, charcoal and manganese dioxide in a ratio of (7-9):(7-9):(0.5-1.5):(1-3):(0.5-1.5).

2. The method for preparing biomass fuel using musk-T polymer according to claim 1, characterized in that, The polymer in step S1 is a byproduct obtained during the preparation of musk-T. The preparation process of the musk-T includes the following steps: ① Raw material preparation: Prepare 250-300 parts of tridecanoic acid and 80-100 parts of ethylene glycol; ② Polymerization reaction: 250-300 parts of tridecanoic acid are added to a 1000L stainless steel polymerization reactor, and 80-100 parts of ethylene glycol are added. The temperature is controlled at 150-160℃. After reacting for 4-6 hours, 20-30 parts of ethylene glycol are recovered by distillation to obtain 310-370 parts of crude product from the polymerization reaction, which can be directly used as raw material in the next step of the reaction. ③ Depolymerization reaction: Place 310-370 parts of the crude product obtained in step ② into two 500L stainless steel depolymerization reactors, add 2-4 parts of catalyst to each reactor (the catalyst is composed of sodium carbonate, alumina and magnesium sulfate), raise the temperature to 280-320℃, and depolymerize under vacuum for 5-8 hours to obtain 285-300 parts of musk-T crude product and 15-25 parts of polymer. ④ Flash evaporation: Place 285-300 parts of the crude musk-T product obtained in step ③ into a 3000L stainless steel fractionating kettle, and carry out crude evaporation under a vacuum of 2000-4000Pa and a temperature of 180-210℃ to obtain 275-285 parts of musk-T product. The remaining polyester after flash evaporation is put back into the depolymerization reaction and recycled continuously. ⑤ Fractionation: 275-285 parts of musk-T product obtained in step ④ are fed into a 2000L fractionation kettle for distillation. Under vacuum, the temperature is controlled at 180-220℃ to obtain 250-270 parts of musk-T finished product. The remaining polyester after distillation is put back into the depolymerization process for recycling.

3. The method for preparing biomass fuel using musk-T polymer according to claim 1, characterized in that, Step S2 includes the following steps: S2.1: Dry 20-60 parts of corn stalks, 20-60 parts of rice stalks and 20-60 parts of sawdust until the moisture content is ≤12wt%. S2.2: The dried corn stalks, rice stalks and sawdust are crushed to obtain corn stalk powder, rice stalk powder and sawdust powder, and then passed through a 40-mesh sieve; S2.3: Mix corn stalk powder, rice stalk powder and sawdust powder in a ratio of 1:1:1 to obtain mixture A.

4. The method for preparing biomass fuel using musk-T polymer according to claim 1, characterized in that, Step S3 includes the following steps: S3.1: Mix mixture A with 10-20wt% sodium hydroxide aqueous solution at a ratio of 1:5-10 to obtain mixture I; S3.2: Heat mixture I to 65-80℃ and maintain for 5-8 hours; S3.3: Filter the heated mixture I again and keep the filter residue for later use; S3.4: Wash the filter residue with clean water 3-5 times to obtain the alkali-treated mixture A.

5. A method for preparing biomass fuel using musk-T polymer according to claim 1, characterized in that, Step S4 includes the following steps: S4.1: Immerse the alkali-treated mixture A in the enzymatic hydrolysis solution at a material-to-liquid ratio of 1:8-15, adjust the pH value to 5-7, and enzymatically hydrolyze for 5-8 hours at a temperature of 35-50℃. S4.2: Filter the solution after enzymatic hydrolysis in step S4.1 and keep the filter residue for later use; S4.3: Wash the filter residue with clean water 3-5 times to obtain the enzymatically hydrolyzed mixture A.

6. The method for preparing biomass fuel using musk-T polymer according to claim 1, characterized in that, The size of the biomass fuel compression mold in step S7 is (2-3) mm × (2-3) mm × (2-3) mm.

7. A method for preparing biomass fuel using musk-T polymer according to claim 1, characterized in that, In step S7, the pressing process is performed twice. The pressure of the first pressing is 15-25 MPa and the pressing time is 15-20 min. The pressure of the second pressing is 30-40 MPa and the pressing time is 15-25 min.

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