Preparation process of pure apple wood biomass pellet fuel

Abstract

The invention relates to the technical field of granular fuel, in particular to a pure apple wood biomass granular fuel preparation process which comprises the following steps: S1, base material selection: selecting apple wood as a base material, and storing the pruned apple wood for less than six months; s2, pretreatment of the base material: the base material is pretreated, and the pretreatment comprises the steps of cleaning, slitting and crushing; and S3, pulping treatment: mixing the pretreated base material with water for pulping treatment to prepare the slurry. According to the method, the white-rot fungi can effectively degrade lignin components of the apple wood, the aspergillus niger can decompose cellulose and hemicellulose, the white-rot fungi and the aspergillus niger have a synergistic effect, organic substances in the apple wood can be effectively decomposed, and the cellulose is converted into lipid and aromatic compounds through microbial metabolism and decomposition; compared with the original cellulose, the lipid and aromatic compound have higher energy density and play a role in increasing the calorific value of the fuel.

Description

Technical Field

[0001] The invention relates to the technical field of pellet fuels, in particular to a preparation process of pure applewood biomass pellet fuel. Background Art

[0002] Pure apple wood biomass pellet fuel is made from apple branches. It is green and environmentally friendly, has a lower cost than traditional fossil fuels, burns stably, and can efficiently provide heat and electricity. It is a highly promising renewable energy source and is widely used in life and industry.

[0003] In the prior art, pure apple wood biomass pellet fuel is made of apple wood as a base material. Since apple wood has a low density, its reserve energy is low, and its combustion performance is poor after being carbonized into fuel. Based on this, the present invention provides a preparation process of pure apple wood biomass pellet fuel. Summary of the invention

[0004] The purpose of the present invention is to provide a preparation process of pure apple wood biomass pellet fuel. The pure apple wood biomass pellet fuel prepared by the present invention not only has good calorific value performance, but also has excellent burning time performance, which effectively improves the use performance of the biomass pellet fuel.

[0005] To achieve the above object, the present invention provides the following technical solution: a process for preparing pure apple wood biomass pellet fuel, comprising the following steps: 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; S5: fermentation treatment, adding fermentation material to the mixed material, standing and fermenting, and obtaining 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; S8: Carbonization treatment: the pellets are sent into a carbonization furnace for carbonization treatment to obtain pure apple wood biomass pellet fuel.

[0006] Furthermore, the base material pretreatment method 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 base material pretreatment.

[0007] Furthermore, the particle size of the crushing process in S2 is ≤5mm.

[0008] Furthermore, the pulping method is as follows: the pretreated base material is mixed with water, and soaked for 4 to 6 days, the mass of the water is 3 to 5 times the mass of the pretreated base material, cellulase is added after soaking, the mass of the cellulase is 0.4 to 0.6% of the mass of the water, and the soaking is continued for 4 to 6 days, stirring is performed every 2 to 4 hours during the soaking process, and the product obtained from the soaking is sent to a pulping machine for pulping to obtain a pulp.

[0009] 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 the raw materials is 10: (1-3): (2-4): (2-4): (0.4-0.6): (0.6-0.8): (1.2-1.4).

[0010] Furthermore, 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.

[0011] Furthermore, the mass of the treatment liquid is 0.06-0.12% of the mass of the slurry.

[0012] Furthermore, the fermentation method is as follows: white rot fungi and black Aspergillus are inoculated 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 at a temperature of 32-34°C and a humidity of 70-72%, to obtain the main material.

[0013] Furthermore, 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 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 granular material, and the granulation diameter is 6-10mm.

[0014] Furthermore, the carbonization treatment method is: adding pellets into a carbonization furnace, setting the carbonization furnace to a heating rate of 10-20°C / min, heating to 580-620°C, and keeping the temperature for 4-6 hours to obtain pure apple wood biomass pellet fuel.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, during the preparation of biomass pellet fuel, apple wood is pulped and fermented. After the apple wood is inoculated with white rot fungi and black Aspergillus, the different metabolic characteristics and enzyme systems of the white rot fungi and black Aspergillus are utilized. The white rot fungi can effectively degrade the lignin component of the apple wood, and the black Aspergillus can decompose cellulose and hemicellulose. The two act synergistically to effectively decompose the organic matter in the apple wood, and convert the cellulose into lipids and aromatic compounds through microbial metabolism and decomposition. Compared with the original cellulose, the lipids and aromatic compounds have higher energy density, thereby improving the calorific value of the fuel.

[0016] 2. In the present invention, by adding the treatment liquid during the fuel preparation process, methanol and naphtha have good volatility and flammability, which can improve the combustion performance of the fuel. Alkylphenol polyoxyethylene ether, as a surfactant, can improve the dispersibility of various components in the slurry, making the mixing more uniform, which is beneficial to the subsequent fermentation and combustion process. 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 the combustion process, further improving the combustion efficiency. DETAILED DESCRIPTION

[0017] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0018] It should be noted that the raw materials used in the following examples are all commercially available raw materials.

[0019] Embodiment 1

[0020] A process for preparing pure apple wood biomass pellet fuel comprises the following steps: 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; S5: fermentation treatment, adding fermentation material to the mixed material, standing and fermenting, and obtaining 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; S8: Carbonization treatment: the pellets are sent into a carbonization furnace for carbonization treatment to obtain pure apple wood biomass pellet fuel.

[0021] Furthermore, the method for pretreating the base material is as follows: the apple wood is immersed in clean water for 4 hours, and after the immersion is completed, it is placed in a ventilated place for 24 hours, and then cut into pieces with a cutting length of 6 cm. The cut apple wood is sent to a hammer mill for crushing to complete the pretreatment of the base material.

[0022] Furthermore, the particle size of the crushing process in S2 is ≤5 mm.

[0023] Furthermore, the pulping method is as follows: the pretreated base material is mixed with water and soaked for 4 days, the mass of the water is 3 times the mass of the pretreated base material, cellulase is added after soaking, the mass of the cellulase is 0.4% of the mass of the water, and the soaking is continued for 4 days. During the soaking process, stirring is performed every 2 hours, and the product obtained by soaking is sent to a pulping machine for pulping to obtain a pulp.

[0024] 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 the raw materials is 10: (1): (2): (2): (0.4): (0.6): (1.2).

[0025] Furthermore, 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 200r / min and stirred for 10 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 800r / min and stirred for 20 minutes to prepare the treatment liquid.

[0026] Furthermore, the mass of the treatment liquid is 0.06% of the mass of the slurry.

[0027] Furthermore, the fermentation method is as follows: white rot fungi and black Aspergillus are inoculated into the mixture, the inoculation amount is 1.2%, the mass ratio of white rot fungi to black Aspergillus is 1:3, after the inoculation is completed, the mixture is fermented at a temperature of 32°C and a humidity of 70% for 7 days to obtain the main material.

[0028] Furthermore, the granulation method is as follows: the main material is added into the reactor, the reactor is set to heat up to 60°C, and after the heating is completed, waste oil is added, the mass of the waste oil is 5% of the mass of the main material, the reactor is set to 600r / min for heat preservation and stirring for 40min, the premixing of the dry material is completed, and the premixed dry material is sent to the granulator for processing to obtain granular material, and the granulation diameter is 6mm.

[0029] Furthermore, 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°C / min, the temperature is raised to 580°C, and the temperature is kept for 4 hours to obtain pure apple wood biomass pellet fuel.

[0030] Embodiment 2

[0031] A process for preparing pure apple wood biomass pellet fuel comprises the following steps: 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; S5: fermentation treatment, adding fermentation material to the mixed material, standing and fermenting, and obtaining 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; S8: Carbonization treatment: the pellets are sent into a carbonization furnace for carbonization treatment to obtain pure apple wood biomass pellet fuel.

[0032] Furthermore, the method for pretreating the base material is as follows: the apple wood is immersed in clean water for 5 hours, and after the immersion is completed, it is placed in a ventilated place for 30 hours, and then cut into pieces with a cutting length of 8 cm. The cut apple wood is sent to a hammer mill for crushing to complete the pretreatment of the base material.

[0033] Furthermore, the particle size of the crushing process in S2 is ≤5 mm.

[0034] Furthermore, the pulping method is as follows: the pretreated base material is mixed with water and soaked for 5 days, the mass of the water is 4 times the mass of the pretreated base material, cellulase is added after soaking, the mass of the cellulase is 0.5% of the mass of the water, and the soaking is continued for 5 days. During the soaking process, stirring is performed every 3 hours, and the product obtained by soaking is sent to a pulping machine for pulping to obtain a pulp.

[0035] 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 the raw materials is 10: (2): (3): (3): (0.5): (0.7): (1.3).

[0036] Furthermore, 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 250r / min and stirred for 15 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 900r / min and stirred for 25 minutes to prepare the treatment liquid.

[0037] Furthermore, the mass of the treatment liquid is 0.09% of the mass of the slurry.

[0038] Furthermore, the fermentation method is as follows: white rot fungi and black Aspergillus are inoculated into the mixture, the inoculation amount is 1.4%, the mass ratio of white rot fungi to black Aspergillus 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 days to obtain the main material.

[0039] Furthermore, the granulation method is as follows: the main material is added into the reactor, the reactor is set to heat up to 65°C, waste oil is added after heating is completed, the mass of the waste oil is 6% of the mass of the main material, the reactor is set to 700r / min for heat preservation and stirring for 50min, the premixing of the dry material is completed, and the premixed dry material is sent to the granulator for processing to obtain granular material, and the granulation diameter is 8mm.

[0040] Furthermore, 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 15°C / min, the temperature is raised to 600°C, and the temperature is kept for 5 hours to obtain pure apple wood biomass pellet fuel.

[0041] Embodiment 3

[0042] A process for preparing pure apple wood biomass pellet fuel comprises the following steps: 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; S5: fermentation treatment, adding fermentation material to the mixed material, standing and fermenting, and obtaining 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; S8: Carbonization treatment: the pellets are sent into a carbonization furnace for carbonization treatment to obtain pure apple wood biomass pellet fuel.

[0043] Furthermore, the method for pretreating the base material is as follows: the apple wood is immersed in clean water for 6 hours, and after the immersion is completed, it is placed in a ventilated place for 36 hours, and then cut into pieces with a cutting length of 10 cm. The cut apple wood is sent to a hammer mill for crushing to complete the pretreatment of the base material.

[0044] Furthermore, the particle size of the crushing process in S2 is ≤5 mm.

[0045] Furthermore, the pulping method is as follows: the pretreated base material is mixed with water and soaked for 6 days, the mass of the water is 5 times the mass of the pretreated base material, cellulase is added after soaking, the mass of the cellulase is 0.6% of the mass of the water, and the soaking is continued for 6 days. During the soaking process, stirring is performed every 4 hours, and the product obtained by soaking is sent to a pulping machine for pulping to obtain a pulp.

[0046] 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 the raw materials is 10: (3): (4): (4): (0.6): (0.8): (1.4).

[0047] Furthermore, 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 300r / min and stirred for 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 1000r / min and stirred for 30 minutes to prepare the treatment liquid.

[0048] Furthermore, the mass of the treatment liquid is 0.12% of the mass of the slurry.

[0049] Furthermore, the fermentation method is as follows: white rot fungi and black Aspergillus are inoculated into the mixture, the inoculation amount is 1.6%, and the mass ratio of white rot fungi to black Aspergillus is 1:3. After the inoculation is completed, the mixture is fermented at a temperature of 34°C and a humidity of 72% for 9 days to obtain the main material.

[0050] Furthermore, the granulation method is as follows: the main material is added into the reactor, the reactor is set to heat up to 70°C, and after the heating is completed, waste oil is added, the mass of the waste oil is 7% of the mass of the main material, the reactor is set to 800r / min for heat preservation and stirring for 60min, the premixing of the dry material is completed, and the premixed dry material is sent to the granulator for processing to obtain granular material, and the granulation diameter is 10mm.

[0051] Furthermore, 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 20°C / min, the temperature is raised to 620°C, and the temperature is kept for 6 hours to obtain pure apple wood biomass pellet fuel.

[0052] Comparative Example 1: The difference between this comparative example and Example 1 is that no premixing process is performed in this comparative example.

[0053] 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 used to replace the treatment liquid.

[0054] Comparative Example 3: The difference between this comparative example and Example 1 is that: in this comparative example, no treatment liquid mixing treatment is performed.

[0055] Comparative Example 4: The difference between this comparative example and Example 1 is that no fermentation treatment is performed in this comparative example.

[0056] Performance test: The pure apple wood biomass pellet fuel prepared in Example 1, Example 2, Example 3, Comparative Example 1, Comparative Example 2, Comparative Example 3 and Comparative Example 4 was subjected to performance test, and the obtained test data is recorded in the following table:

[0057] It can be seen that the calorific value performance and combustion time performance of the pure apple wood biomass pellet fuel 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 process of preparing biomass pellet fuel, after the apple wood is inoculated with white rot fungi and black Aspergillus, the white rot fungi and black Aspergillus use different metabolic characteristics and enzyme systems. The white rot fungi can effectively degrade the lignin component of the apple wood, and the black Aspergillus can decompose cellulose and hemicellulose. The two work synergistically to effectively decompose the organic matter in the apple wood, and convert cellulose into lipids and aromatic compounds through microbial metabolism and decomposition. The lipids and aromatics Compared with the original cellulose, aromatic compounds have higher energy density and play a role in improving the calorific value of fuel. Through the addition of treatment liquid in the fuel preparation process, methanol and naphtha have good volatility and flammability, which can improve the combustion performance of fuel. Alkylphenol polyoxyethylene ether, as a surfactant, can improve the dispersion of various components in the slurry, making it more evenly mixed, which is beneficial to the subsequent fermentation and combustion process. The oxidation effect of cyclohexyl nitrate and hydrogen peroxide can be used to increase the reactivity of raw materials and promote the role of microorganisms in the fermentation process. At the same time, it also helps the oxidation reaction of fuel during combustion, further improving combustion efficiency.

[0058] By comparing and analyzing the relevant data in the table, it can be seen that the pure apple wood biomass pellet fuel prepared by the present invention not only has good calorific value performance, but also has excellent burning time performance. This shows that the preparation process of pure apple wood biomass pellet fuel provided by the present invention has a broader market prospect and is more suitable for promotion.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] 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 implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only 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; S5: fermentation treatment, adding fermentation material to the mixed material, standing and fermenting, and obtaining 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; 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 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).

6. The process for preparing pure apple wood biomass pellet fuel according to claim 5, 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.

7. 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.

8. The process for preparing pure apple wood biomass pellet fuel according to claim 1, characterized in that: The fermentation method is as follows: inoculating white rot fungi and black Aspergillus into a 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 at a temperature of 32-34° C. and a humidity of 70-72%, to obtain the main material.

9. The process for preparing pure apple wood biomass pellet fuel according to claim 1, characterized in that: 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 heat and stir at 600-800r / min 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 granular material, and the granulation diameter is 6-10mm.

10. 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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