A preparation process for pure apple wood biomass pellets

Abstract

The present invention relates to the technical field of pellet fuels, and specifically to a preparation process for pure apple wood biomass pellet fuels, which includes the following steps: S1: Selection of base materials. Apple wood is selected as the base material, and the storage time of the trimmed apple wood is less than six months; S2: Pretreatment of base materials. The base materials are pretreated, and the pretreatment steps include cleaning, slicing, and crushing; S3: Pulping treatment. The pretreated base materials are mixed with water for pulping treatment to obtain pulp. In the present invention, white rot fungi can effectively degrade the lignin component of apple wood, and Aspergillus niger can decompose cellulose and hemicellulose. The synergistic effect of the two can effectively decompose the organic substances in apple wood. Through microbial metabolism and decomposition, cellulose is converted into lipids and aromatic compounds. Compared with the original cellulose, lipids and aromatic compounds have a higher energy density, which plays a role in increasing the calorific value of the fuel.

Description

Technical Field

[0001] The present invention relates to the technical field of pellet fuels, and specifically to a preparation process for pure apple wood biomass pellet fuels. Background Art

[0002] Pure apple wood biomass pellet fuels are made from apple branches. They are green and environmentally friendly, have a lower cost than traditional fossil fuels, burn stably, and can efficiently supply heat and generate electricity. They are a highly potential renewable energy source and are widely used in the fields of life and industry.

[0003] In the prior art, pure apple wood biomass pellet fuels are made into pellet fuels with apple wood as the base material. Due to the low density of apple wood, the stored energy is low, and after carbonization to make fuels, their combustion performance is poor. Based on this, the present invention provides a preparation process for pure apple wood biomass pellet fuels. Summary of the Invention

[0004] The purpose of the present invention is to provide a preparation process for pure apple wood biomass pellet fuels. The pure apple wood biomass pellet fuels prepared by the present invention not only have good calorific value performance but also excellent combustion time performance, effectively improving the use performance of biomass pellet fuels.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A preparation process for pure apple wood biomass pellet fuels, comprising the following steps:

[0006] S1: Selection of base material, select apple wood as the base material, and the storage time of the pruned apple wood is less than six months;

[0007] S2: Pretreatment of base material, perform pretreatment on the base material, and the steps of pretreatment include cleaning, cutting, and crushing;

[0008] S3: Pulping treatment, mix the pretreated base material with water for pulping treatment to obtain a pulp;

[0009] S4: Preparation of treatment liquid, mix the treatment liquid with the pulp to obtain a mixture;

[0010] S5: Fermentation treatment, add fermentation material to the mixture, and after static fermentation, obtain the main material;

[0011] S6: Dehydration treatment, perform static precipitation treatment on the main material, remove the supernatant, and then press and dehydrate the obtained precipitate to obtain a dry material;

[0012] S7: Pelletizing treatment, after the dry material undergoes premixing treatment, send it into a pelletizer for pelletizing treatment to obtain pellet materials;

[0013] S8: Carbonization treatment, send the pellet materials into a carbonization furnace for carbonization treatment to obtain pure apple wood biomass pellet fuels.

[0014] Further, the method for pre-treating the base material is as follows: apple wood is immersed in clean water for 4 - 6 h, and after soaking, it is placed in a ventilated place and left to stand for 24 - 36 h. Then, it is cut, with the cutting length being 6 - 10 cm. The cut apple wood is sent into a hammer mill for crushing treatment to complete the pre-treatment of the base material.

[0015] Further, the particle size of the crushing treatment in S2 is ≤ 5 mm.

[0016] Further, the method for pulping treatment is as follows: the pre-treated base material is mixed with water and soaked for 4 - 6 d. The mass of the water is 3 - 5 times the mass of the pre-treated base material. After soaking, cellulase is added, and the mass of the cellulase is 0.4 - 0.6% of the mass of the water. Then, it is soaked for another 4 - 6 d, and during the soaking process, stirring treatment is carried out every 2 - 4 h. The soaked product is sent into a refiner for refining to obtain pulp.

[0017] Further, the raw materials of the treatment liquid are composed of methanol, water, naphtha, alkylphenol polyoxyethylene ether, cyclohexyl nitrate, hydrogen peroxide, and potassium tert-butoxide, and the mass ratio of each raw material is 10:(1 - 3):(2 - 4):(2 - 4):(0.4 - 0.6):(0.6 - 0.8):(1.2 - 1.4).

[0018] Further, the treatment liquid is prepared by the following method: methanol, water, and naphtha are weighed as required and added into a mixer. The mixer is set to stir at 200 - 300 r / min for 10 - 20 min. Then, alkylphenol polyoxyethylene ether, cyclohexyl nitrate, hydrogen peroxide, and potassium tert-butoxide are weighed as required and added into the mixer. The mixer is set to stir at 800 - 1000 r / min for 20 - 30 min to obtain the treatment liquid.

[0019] Further, the mass of the treatment liquid is 0.06 - 0.12% of the mass of the pulp.

[0020] Further, the method for fermentation treatment is as follows: white rot fungi and Aspergillus niger are inoculated into the mixture, and the inoculation amount is 1.2 - 1.6%. The mass ratio of the white rot fungi to Aspergillus niger is 1:3. After inoculation, the mixture is fermented at a temperature of 32 - 34 °C and a humidity of 70 - 72% for 7 - 9 d to obtain the main material.

[0021] Further, the method of granulation treatment is as follows: the main material is added into a reaction kettle, and the reaction kettle is set to heat up to 60 - 70 °C. After the temperature rise is completed, waste engine oil is added, and the mass of the waste engine oil is 5 - 7% of the mass of the main material. The reaction kettle is set to carry out heat preservation stirring treatment at 600 - 800 r / min for 40 - 60 min to complete the premixing treatment of the dry material. The dry material after the premixing treatment is sent into a granulator for treatment to obtain granular materials, and the granulation diameter is 6 - 10 mm.

[0022] Further, the method of carbonization treatment is as follows: the granular materials are added into a carbonization furnace, and the carbonization furnace is set to have a heating rate of 10 - 20 °C / min and heat up to 580 - 620 °C, and then keep warm for 4 - 6 h to obtain pure apple wood biomass pellet fuel.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] 1. In the present invention, through the pulping and fermentation treatment of apple wood in the preparation process of biomass pellet fuel, after apple wood is inoculated with white rot fungi and Aspergillus niger, by using the different metabolic characteristics and enzyme systems of white rot fungi and Aspergillus niger, white rot fungi can effectively degrade the lignin component of apple wood, and Aspergillus niger can decompose cellulose and hemicellulose. The two work together to effectively decompose the organic substances in apple wood, and through microbial metabolism and decomposition, cellulose is converted into lipids and aromatic compounds. Lipids and aromatic compounds have a higher energy density compared with the original cellulose, which plays a role in increasing the calorific value of the fuel.

[0025] 2. In the present invention, through the addition of treatment liquid in the fuel preparation process, among them, methanol and naphtha have good volatility and flammability, which can play a role in improving the combustion performance of the fuel. Alkylphenol polyoxyethylene ether, as a surfactant, can improve the dispersibility of various components in the slurry, make their mixing more uniform, and is beneficial to the subsequent fermentation and combustion processes. By using the oxidation effect of cyclohexyl nitrate and hydrogen peroxide, the reaction activity of the raw materials can be improved, the role of microorganisms in the fermentation process can be promoted, and at the same time, it is also helpful for the oxidation reaction of the fuel during the combustion process, further improving the combustion efficiency. Specific Embodiments

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0027] It should be noted that the raw materials used in the following embodiments are all commercially available raw materials.

[0028] Example 1

[0029] A preparation process of pure apple wood biomass pellet fuel, comprising the following steps:

[0030] S1: Selection of base material, using apple wood as the base material, and the storage time of the trimmed apple wood is less than six months;

[0031] S2: Pretreatment of base material, performing pretreatment on the base material, and the steps of pretreatment include cleaning, cutting, and crushing;

[0032] S3: Pulping treatment, mixing the pretreated base material with water for pulping treatment to obtain pulp;

[0033] S4: Preparation of treatment liquid, mixing the treatment liquid with the pulp for mixing treatment to obtain a mixture;

[0034] S5: Fermentation treatment, adding fermentation material to the mixture, and after static fermentation, obtaining the main material;

[0035] S6: Dewatering treatment, performing static precipitation treatment on the main material, removing the supernatant, and subjecting the obtained precipitate to pressing and dewatering treatment to obtain dry material;

[0036] S7: Pelletizing treatment, after the dry material undergoes premixing treatment, feeding it into a pelletizing machine for pelletizing treatment to obtain pelletized material;

[0037] S8: Carbonization treatment, feeding the pelletized material into a carbonization furnace for carbonization treatment to obtain pure apple wood biomass pellet fuel.

[0038] Further, the method for pretreating the base material is: immersing the apple wood in clean water for 4 h, allowing it to stand in a ventilated place for 24 h after immersion, then performing cutting treatment with a cutting length of 6 cm, and feeding the cut apple wood into a hammer mill for crushing treatment to complete the pretreatment of the base material.

[0039] Further, the particle size of the crushing treatment in S2 is ≤ 5 mm.

[0040] Further, the method for pulping treatment is: mixing the pretreated base material with water, soaking for 4 d, the mass of water being 3 times the mass of the pretreated base material, adding cellulase after soaking, the mass of cellulase being 0.4% of the mass of water, continuing to soak for 4 d, and performing stirring treatment every 2 h during the soaking process, and feeding the soaked product into a refiner for refining to obtain pulp.

[0041] Further, the raw materials of the treatment liquid are composed of methanol, water, naphtha, alkylphenol polyoxyethylene ether, cyclohexyl nitrate, hydrogen peroxide, and potassium tert-butoxide, and the mass ratio of each raw material is 10:(1):(2):(2):(0.4):(0.6):(1.2).

[0042] Further, the treatment liquid is prepared by the following method: Weigh methanol, water and naphtha as needed and add them to a mixer. The mixer is set to stir at 200 r / min for 10 min. Then, weigh alkylphenol polyoxyethylene ether, cyclohexyl nitrate, hydrogen peroxide and potassium tert-butoxide as needed and add them to the mixer. The mixer is set to stir at 800 r / min for 20 min to obtain the treatment liquid.

[0043] Further, the mass of the treatment liquid is 0.06% of the mass of the slurry.

[0044] Further, the fermentation treatment method is as follows: Inoculate white rot fungus and Aspergillus niger into the mixture, with an inoculation amount of 1.2%. The mass ratio of white rot fungus to Aspergillus niger is 1:3. After inoculation, the mixture is fermented at a temperature of 32 °C and a humidity of 70% for 7 d to obtain the main material.

[0045] Further, the granulation treatment method is as follows: Add the main material to a reaction kettle. The reaction kettle is set to heat up to 60 °C. After heating, add waste engine oil, and the mass of the waste engine oil is 5% of the mass of the main material. The reaction kettle is set to keep warm and stir at 600 r / min for 40 min to complete the premixing treatment of the dry material. The dry material after the premixing treatment is sent to a granulator for treatment to obtain granular materials, and the granulation diameter is 6 mm.

[0046] Further, the carbonization treatment method is as follows: Add the granular materials to a carbonization furnace. The carbonization furnace is set to have a heating rate of 10 °C / min and heat up to 580 °C, and keep warm for 4 h to obtain pure apple wood biomass pellet fuel.

[0047] Example Two

[0048] A preparation process of pure apple wood biomass pellet fuel includes the following steps:

[0049] S1: Selection of base material. Select apple wood as the base material, and the storage time of the trimmed apple wood is less than six months.

[0050] S2: Pretreatment of base material. Pretreat the base material, and the pretreatment steps include cleaning, cutting and crushing.

[0051] S3: Pulping treatment. Mix the pretreated base material with water for pulping treatment to obtain slurry.

[0052] S4: Preparation of treatment liquid. Mix the treatment liquid with the slurry to obtain a mixture.

[0053] S5: Fermentation treatment. Add fermentation materials to the mixture, and after static fermentation, obtain the main material.

[0054] S6: Dehydration treatment. Perform static precipitation treatment on the main material, remove the supernatant, and press and dehydrate the obtained precipitate to obtain dry materials.

[0055] S7: Granulation process. After the dry materials are pre-mixed, they are sent into a granulator for granulation to obtain granular materials.

[0056] S8: Carbonization process. The granular materials are sent into a carbonization furnace for carbonization to obtain pure apple wood biomass pellet fuel.

[0057] Furthermore, the method for the pretreatment of the base material is as follows: The apple wood is immersed in clean water for 5 h. After the immersion is completed, it is placed in a ventilated place and left to stand for 30 h. Then, it is subjected to a cutting process, and the cutting length is 8 cm. The apple wood after cutting is sent into a hammer mill for crushing to complete the pretreatment of the base material.

[0058] Furthermore, in S2, the particle size of the crushing process is ≤5 mm.

[0059] Furthermore, the method for the pulping process is as follows: The base material after pretreatment is mixed with water and soaked for 5 d. The mass of water is 4 times the mass of the base material after pretreatment. After the soaking is completed, cellulase is added, and the mass of cellulase is 0.5% of the mass of water. Soaking continues for another 5 d, and during the soaking process, stirring is carried out every 3 h. The product obtained after soaking is sent into a refiner for pulping to obtain pulp.

[0060] Furthermore, the raw materials of the treatment liquid are composed of methanol, water, naphtha, alkylphenol polyoxyethylene ether, cyclohexyl nitrate, hydrogen peroxide, and potassium tert-butoxide, and the mass ratio of each raw material is 10:(2):(3):(3):(0.5):(0.7):(1.3).

[0061] Furthermore, the treatment liquid is prepared by the following method: Weigh methanol, water, and naphtha as required and add them into a mixer. The mixer is set to stir at 250 r / min for 15 min. Then, weigh alkylphenol polyoxyethylene ether, cyclohexyl nitrate, hydrogen peroxide, and potassium tert-butoxide as required and add them into the mixer. The mixer is set to stir at 900 r / min for 25 min to obtain the treatment liquid.

[0062] Furthermore, the mass of the treatment liquid is 0.09% of the mass of the pulp.

[0063] Furthermore, the method for the fermentation process is as follows: White rot fungi and Aspergillus niger are inoculated into the mixture, and the inoculation amount is 1.4%. The mass ratio of white rot fungi to Aspergillus niger is 1:3. After the inoculation is completed, the mixture is fermented at a temperature of 33 °C and a humidity of 71% for 8 d to obtain the main material.

[0064] Further, the granulation treatment method is as follows: The main material is added into the reaction kettle, and the reaction kettle is set to heat up to 65°C. After the temperature rise is completed, waste engine oil is added, and the mass of the waste engine oil is 6% of the mass of the main material. The reaction kettle is set to carry out heat preservation stirring treatment at 700 r / min for 50 min to complete the premixing treatment of the dry material. The dry material after the premixing treatment is sent into a granulator for treatment to obtain granular material, and the granulation diameter is 8 mm.

[0065] Further, the carbonization treatment method is as follows: The granular material is added into the carbonization furnace, and the carbonization furnace is set to have a heating rate of 15°C / min and heat up to 600°C, and then keep it warm for 5 h to obtain pure apple wood biomass granular fuel.

[0066] Example 3

[0067] A preparation process of pure apple wood biomass granular fuel includes the following steps:

[0068] S1: Selection of base material. Apple wood is selected as the base material, and the storage time of the pruned apple wood is less than six months.

[0069] S2: Pretreatment of base material. The base material is pretreated, and the pretreatment steps include cleaning, cutting, and crushing.

[0070] S3: Pulping treatment. The base material after the pretreatment is mixed with water for pulping treatment to obtain pulp.

[0071] S4: Preparation of treatment liquid. The treatment liquid is mixed with the pulp to obtain a mixture.

[0072] S5: Fermentation treatment. Fermentation material is added to the mixture, and after standing fermentation, the main material is obtained.

[0073] S6: Dewatering treatment. The main material is subjected to standing precipitation treatment, and after removing the supernatant, the obtained precipitate is pressed and dehydrated to obtain dry material.

[0074] S7: Granulation treatment. After the dry material is subjected to premixing treatment, it is sent into a granulator for granulation treatment to obtain granular material.

[0075] S8: Carbonization treatment. The granular material is sent into a carbonization furnace for carbonization treatment to obtain pure apple wood biomass granular fuel.

[0076] Further, the method for pretreating the base material is as follows: The apple wood is immersed in clean water for 6 h. After the immersion is completed, it is placed in a ventilated place and left to stand for 36 h, and then cutting treatment is carried out. The cutting length is 10 cm. The apple wood after cutting is sent into a hammer mill for crushing treatment to complete the pretreatment of the base material.

[0077] Further, in S2, the particle size of the crushing treatment is ≤5 mm.

[0078] Further, the method of pulping treatment is as follows: The base material after pretreatment is mixed with water and soaked for 6 days. The mass of water is 5 times that of the base material after pretreatment. After soaking, cellulase is added. The mass of cellulase is 0.6% of the mass of water. Then, it is soaked for another 6 days, and during the soaking process, stirring treatment is carried out every 4 hours. The product obtained after soaking is sent to a refiner for refining to obtain pulp.

[0079] Further, the raw materials of the treatment liquid are composed of methanol, water, naphtha, alkylphenol polyoxyethylene ether, cyclohexyl nitrate, hydrogen peroxide, and potassium tert-butoxide. The mass ratio of each raw material is 10:(3):(4):(4):(0.6):(0.8):(1.4).

[0080] Further, the treatment liquid is prepared by the following method: Weigh methanol, water, and naphtha as required and add them to a mixer. The mixer is set to stir at 300 r / min for 20 minutes. Then, weigh alkylphenol polyoxyethylene ether, cyclohexyl nitrate, hydrogen peroxide, and potassium tert-butoxide as required and add them to the mixer. The mixer is set to stir at 1000 r / min for 30 minutes to obtain the treatment liquid.

[0081] Further, the mass of the treatment liquid is 0.12% of the mass of the pulp.

[0082] Further, the method of fermentation treatment is as follows: White rot fungi and Aspergillus niger are inoculated into the mixture, and the inoculation amount is 1.6%. The mass ratio of white rot fungi to Aspergillus niger is 1:3. After inoculation, the mixture is fermented at a temperature of 34 °C and a humidity of 72% for 9 days to obtain the main material.

[0083] Further, the method of granulation treatment is as follows: The main material is added to a reaction kettle, and the reaction kettle is set to heat up to 70 °C. After heating, waste engine oil is added. The mass of waste engine oil is 7% of the mass of the main material. The reaction kettle is set to stir at 800 r / min for heat preservation for 60 minutes to complete the premixing treatment of the dry material. The dry material after premixing treatment is sent to a granulator for treatment to obtain granular material, and the granulation diameter is 10 mm.

[0084] Further, the method of carbonization treatment is as follows: The granular material is added to a carbonization furnace, and the carbonization furnace is set to have a heating rate of 20 °C / min and heat up to 620 °C, and then keep warm for 6 hours to obtain pure apple wood biomass pellet fuel.

[0085] Comparative Example 1. The difference between this comparative example and Example 1 is that in this comparative example, no premixing treatment is carried out.

[0086] Comparative Example 2. The difference between this comparative example and Example 1 is that in this comparative example, an equal amount of pine oil is selected to replace the treatment liquid.

[0087] Comparative Example 3: The difference between this comparative example and Example 1 is that no treatment liquid mixing treatment was carried out in this comparative example.

[0088] Comparative Example 4: The difference between this comparative example and Example 1 is that no fermentation treatment was carried out in this comparative example.

[0089] Performance test: Performance tests were carried out on the pure apple wood biomass pellet fuels prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3, and Comparative Example 4, and the obtained test data were recorded in the following table:

[0090]

[0091] It can be seen that the calorific value performance and combustion time performance of the pure apple wood biomass pellet fuels prepared in Comparative Examples 1, 2, 3, and 4 are lower than those in Examples 1, 2, and 3. This shows that: through the pulping and fermentation treatment of apple wood in the preparation process of biomass pellet fuel, after apple wood is inoculated with white rot fungi and Aspergillus niger, using the different metabolic characteristics and enzyme systems of white rot fungi and Aspergillus niger, white rot fungi can effectively degrade the lignin component of apple wood, and Aspergillus niger can decompose cellulose and hemicellulose. The two act synergistically to effectively decompose the organic matter in apple wood. Through microbial metabolism and decomposition, cellulose is converted into lipids and aromatic compounds. Lipids and aromatic compounds have a higher energy density compared to the original cellulose, which plays a role in increasing the calorific value of the fuel. Through the addition of treatment liquid in the fuel preparation process, among them, methanol and naphtha have good volatility and flammability, which can play a role in improving the combustion performance of the fuel. Alkylphenol polyoxyethylene ether, as a surfactant, can improve the dispersibility of various components in the slurry, making their mixing more uniform, which is beneficial to the subsequent fermentation and combustion processes. Utilizing the oxidation effect of cyclohexyl nitrate and hydrogen peroxide can improve the reaction activity of the raw materials, promote the role of microorganisms in the fermentation process, and also contribute to the oxidation reaction of the fuel during combustion, further improving the combustion efficiency.

[0092] By comparing and analyzing the relevant data in the table, it can be known that the pure apple wood biomass pellet fuel prepared by the present invention not only has good calorific value performance but also has excellent combustion time performance. This shows that the preparation process of the pure apple wood biomass pellet fuel provided by the present invention has a broader market prospect and is more suitable for popularization.

[0093] In the description of this specification, the descriptions referring to the terms "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0094] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A process for preparing pure apple wood biomass pellet fuel, characterized by: The following steps are involved: S1: Selection of base material: apple wood is selected as the base material, and the storage time of apple wood under pruning is less than six months; S2: base material pretreatment, the base material is pretreated, and the pretreatment steps include cleaning, cutting and crushing; S3: pulping treatment, mixing the pretreated base material with water for pulping treatment to obtain slurry; S4: preparing a treatment liquid, mixing the treatment liquid with the slurry to obtain a mixture; The raw materials of the treatment liquid are composed of methanol, water, naphtha, alkylphenol polyoxyethylene ether, cyclohexyl nitrate, hydrogen peroxide, and potassium tert-butoxide, and the mass ratio of the raw materials is 10: (1-3): (2-4): (2-4): (0.4-0.6): (0.6-0.8): (1.2-1.4); S5: fermentation treatment, adding fermentation material to the mixed material, standing and fermenting, and obtaining the main material; The fermentation method comprises: inoculating white rot fungi and black Aspergillus into the mixture, the inoculation amount is 1.2-1.6%, the mass ratio of the white rot fungi to the black Aspergillus is 1:3, after the inoculation is completed, the mixture is fermented for 7-9 days under the conditions of temperature of 32-34° C. and humidity of 70-72%, to obtain the main material; S6: Dehydration treatment, the main material is subjected to static sedimentation treatment, after the supernatant is removed, the obtained precipitate is pressed and dehydrated to obtain a dry material; S7: Granulation treatment: after the dry materials are premixed, they are sent to a granulator for granulation treatment to obtain granular materials; The granulation method is as follows: the main material is added into a reactor, the reactor is set to heat up to 60-70°C, waste oil is added after the heating is completed, the mass of the waste oil is 5-7% of the mass of the main material, the reactor is set to 600-800r / min for heat preservation and stirring for 40-60min, the premixing of the dry material is completed, and the premixed dry material is sent to a granulator for processing to obtain granules, and the granulation diameter is 6-10mm; S8: Carbonization treatment: the pellets are sent into a carbonization furnace for carbonization treatment to obtain pure apple wood biomass pellet fuel.

2. The process for preparing pure apple wood biomass pellet fuel according to claim 1, characterized in that: The method for pretreating the base material is as follows: the apple wood is immersed in clean water for 4 to 6 hours, and after the immersion is completed, it is placed in a ventilated place for 24 to 36 hours, and then cut into pieces with a cutting length of 6 to 10 cm. The cut apple wood is sent to a hammer mill for crushing to complete the pretreatment of the base material.

3. The process for preparing pure apple wood biomass pellet fuel according to claim 2, characterized in that: The particle size of the crushing process in S2 is ≤5 mm.

4. The process for preparing pure apple wood biomass pellet fuel according to claim 1, characterized in that: The pulping method is as follows: the pretreated base material is mixed with water, and soaked for 4 to 6 days, wherein the mass of the water is 3 to 5 times the mass of the pretreated base material; after soaking, cellulase is added, wherein the mass of the cellulase is 0.4 to 0.6% of the mass of the water; the soaking is continued for 4 to 6 days, and stirring is performed every 2 to 4 hours during the soaking process; the product obtained by soaking is sent to a pulping machine for pulping to obtain pulp.

5. The process for preparing pure apple wood biomass pellet fuel according to claim 1, characterized in that: The treatment liquid is prepared by the following method: methanol, water and naphtha are weighed as needed and added into a mixer, the mixer is set to 200-300 r / min and stirred for 10-20 minutes, then alkylphenol polyoxyethylene ether, cyclohexyl nitrate, hydrogen peroxide and potassium tert-butoxide are weighed as needed and added into the mixer, the mixer is set to 800-1000 r / min and stirred for 20-30 minutes to prepare the treatment liquid.

6. The process for preparing pure apple wood biomass pellet fuel according to claim 1, characterized in that: The mass of the treatment liquid is 0.06-0.12% of the mass of the slurry.

7. The process for preparing pure apple wood biomass pellet fuel according to claim 1, characterized in that: The carbonization treatment method is as follows: the pellets are added into a carbonization furnace, the carbonization furnace is set to have a heating rate of 10-20°C / min, the temperature is raised to 580-620°C, and the temperature is kept for 4-6 hours to obtain pure apple wood biomass pellet fuel.

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