CN110331020B

CN110331020B - Preparation method of moistureproof high-energy biomass granular fuel

Info

Publication number: CN110331020B
Application number: CN201910571430.1A
Authority: CN
Inventors: 孟凡辉; 郑洋; 崔涛; 孟伟
Original assignee: Anhui Jevo Recycling Agriculture Development Co ltd
Current assignee: Anhui Jevo Recycling Agriculture Development Co ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-11-03
Anticipated expiration: 2039-06-28
Also published as: CN110331020A

Abstract

The invention discloses a preparation method of damp-proof high-energy biomass granular fuel, belonging to the technical field of biomass fuel, the invention utilizes activated sludge to carry out hydrothermal treatment on plant straw powder and the like which are biomass raw materials, and then utilizes digested sludge to synthesize energy-containing macromolecules in a positioning way, all the components are mixed and granulated to organically combine and use the biomass energy activated sludge, nitrated sludge and plant straw powder, the produced biomass granular fuel has good caking property, high heat energy value, high combustion efficiency and small combustion pollution, is beneficial to the construction of ecological environment, and can enhance the combustion effect and improve the combustion heat value by properly adding some charcoal slag powder, and the combination and collocation of various raw materials including nitrated sludge, an activating agent, polyethylene glycol nitrate and the like in the fuel can be beneficial to the storage of the fuel, avoid the fuel from being affected with moisture and getting damp again, thereby improving the combustion quality of the fuel, meanwhile, the problem of poor combustion heat energy value caused by fuel wetting is avoided.

Description

Preparation method of moistureproof high-energy biomass granular fuel

Technical Field

The invention belongs to the field of biomass fuels, and particularly relates to a preparation method of a moistureproof high-energy biomass granular fuel.

Background

The energy is inseparable from the sustainable survival development of human beings, the construction and development of social and economic culture and the healthy and prosperous of the earth biosphere. At present, human beings mainly use disposable fossil fuels such as petroleum, natural gas and coal as energy sources, and the energy sources face the problem of resource exhaustion, and cause the problems of change of global climate and natural conditions, serious environmental pollution, balance destruction of ecology and ecological system thereof, and the like in the process of utilization, and the hydrogen is gradually accepted by scientists and society as a pollution-free energy source capable of being continuously supplied. The activated sludge is a general name of microbial communities and organic substances and inorganic substances attached to the microbial communities, is an aerobic biological treatment substance and is mainly used for treating sewage and wastewater. The complex microorganisms in the activated sludge form a complex food chain with organic nutrients in the wastewater, wherein the microbial population mainly comprises bacteria, protozoa, algae, and the like. The traditional physical mechanical mixing method for preparing the high-energy fuel generally has the problems of insufficient raw material supply, serious environmental pollution, more byproducts and poor process safety. The biosynthesis technology can overcome the defects of the traditional physical mechanical mixing method technology and is a common urgent need for technical change in the field of high-energy fuel preparation, the traditional high-energy dye preparation technology usually takes petroleum, natural gas, coal and derived products thereof as raw materials for production, safety problems and sexual problems exist in the aspects of high-energy fuel supply and stability under the condition of world, particularly under the condition of shortage of nonrenewable petrochemical resources in China, and although the petrochemical fuel still belongs to a leading product in economic development at present, the current situation that the energy consumption is large and the emission of pollutants such as carbon dioxide, sulfur dioxide, smoke dust, oxides and the like is large is faced, and the sustainable development strategy is extremely unfavorable. The green biomass fuel is used as a new technology, is a common urgent demand of technical change in the field of high-energy fuel preparation, uses carbohydrates such as glucose, xylose and the like as raw materials, is a biomass renewable resource, has huge manufacturing quantity every year on the earth, has strategic significance for solving the problem of resource shortage in China, is influenced by petroleum crisis and needs of social sustainable development on energy and environmental protection from the middle and later stages of the last century, and has widely aroused the heat tide of utilization of renewable energy sources in the world. The novel biological renewable energy is rapidly developed, but present biomass particles are easy to be wetted, so that the weight is increased, the combustion effect is influenced, the mildew is easy to occur due to the reason of the biomass raw material, the common heat value of the present biomass fuel is low, the slag bonding is easy, and the technical personnel in the field need to develop the novel moisture-proof high-energy biomass fuel urgently.

Disclosure of Invention

The invention aims to provide a preparation method of a moistureproof high-energy biomass granular fuel aiming at the existing problems.

The invention is realized by the following technical scheme:

step one, hydrothermal treatment of modified activated sludge:

adding water into 82-93 parts by weight of modified activated sludge to enable the water content of the modified activated sludge to be 67.3-71.2%, crushing 115-138 parts by weight of plant straw powder and 2.1-5.4 parts by weight of ethylenediamine di-o-phenyl sodium diacetate to 300-400 meshes, crushing 22-31 parts by weight of charcoal slag powder to 100-300 meshes, and preparing 15-20 parts by weight of edible alkaline water with the mass fraction of 2-5% for later use; uniformly mixing the crushed mixture of the plant straw powder and the ethylenediamine di-o-phenyl sodium diacetate with edible alkaline water, and stacking for 6-10 hours to obtain a mixture A; uniformly mixing the mixture A with the obtained modified activated sludge, charcoal slag powder and an active agent, heating the mixture A in a microwave hydrothermal kettle at 180-200 ℃ for 1.5-2 h while stirring, cooling, preserving heat for 0.5-0.8 h after cooling to 100-105 ℃, and cooling to obtain a hydrothermal treated mixture B, wherein the microwave heating frequency is 2400-2500 MHz;

step two, fixed transformation of digested sludge

100-115 parts of nitrosation sludge with stable properties are taken and placed in a membrane bioreactor, 1-2 periods are carried out under the anaerobic condition that the pH is 7.1-7.6, the DO is 0.4-0.6 mg/L, the temperature is 16-20 ℃ and the ammonia nitrogen concentration is 160-180 mg/L, each period is 2-4 h/day, then the effluent filtrate is centrifuged for 2-10 minutes at 4000-5000 r/min, the solid is taken and dried in a vacuum drying box at 20-30 ℃ in the shade, nitrification sludge containing 16-20% of water is obtained, the nitrification sludge is placed in a ball mill and ground into powder particles of 40-100 meshes, in addition of acetone, the weight ratio of the nitrification sludge to the acetone is 1: 2-5, and the nitrification sludge and the acetone are placed in a high-speed mixer and fully mixed; carrying out ultrasonic treatment on the uniformly mixed sample, wherein the working frequency of ultrasonic waves is 20-30 kHz, the treatment time is 4-8 minutes, then placing the sample into a constant-temperature water bath reaction kettle at the temperature of 20-25 ℃, adding water bath oscillation time for 20-30 minutes, then carrying out 1-2 cycles with the oscillation frequency of 150-180 times/minute under the anaerobic condition that the pH is 7.5-8.2, the DO is 0.6-0.8 mg/L, the temperature is 20-23 ℃, and the ammonia nitrogen concentration is 235-250 mg/L, collecting sludge residues after the reaction is finished, and airing to obtain an active sludge mixture containing the polyhydroxy fatty acid ester;

step three, preparation of damp-proof high-energy biomass granular fuel

And (3) uniformly mixing the mixture B obtained in the step one after the hydrothermal treatment, the mixture containing the energy polyhydroxyalkanoate activated sludge obtained in the step two and the polyethylene glycol nitrate according to the weight ratio of 2-5: 1: 0.01, and granulating to obtain the moisture-proof high-energy biomass granular fuel.

Further, the modified activated sludge in the step (1) is activated sludge subjected to alkali catalytic modification treatment, and the specific modification method comprises the steps of taking out bioactive sludge precipitated in a sedimentation tank, drying in the shade and dehydrating the taken-out bioactive sludge to ensure that the water content of the dehydrated activated sludge is 48.5-52.5%, adding quicklime accounting for 2-5% of the total weight of the activated sludge, uniformly stirring, then aging, dry distilling and activating in a high-temperature reaction furnace under nitrogen atmosphere to volatilize part of biological organic matters, carrying out alkalization and pyrolysis on the activated sludge, aging in an ultraviolet aging box with the aging temperature of 120-150 ℃ for 50-100min, the dry distilling temperature of 310-400 ℃, the dry distilling time of 5-15 min, activating by introducing acetic acid vapor, the activating temperature of 200-350 ℃, and the activating time of 10-15 min, the temperature of the acetic acid steam is 230-280 ℃, and the mass concentration of acetic acid in the acetic acid steam is 5-10%.

Further, the active agent in the first step is composed of 20-28 parts of ferrocene, 1.5-2.1 parts of sodium dodecyl benzene sulfonate, 1.5-1.8 parts of glycerol and 10-13 parts of sodium citrate.

Further, the nitrite accumulation rate of the nitrified sludge in the second step is 49-55%.

Further, the polyethylene glycol nitrate in the third step is obtained by carrying out nitration reaction on polyethylene glycol in a mixture of nitric acid and diethyl ether, wherein the content of a nitration group accounts for 5-10%, and the relative molecular mass is 1000-20000.

Further, the plant straw powder in the first step is one or more of tortoise shell and dragon stem powder, dragon bone powder, perennial drynaria herb and peanut straw.

The invention has the beneficial effects that:

the hydrothermal treatment and the modified activated sludge of the ethylenediamine di-o-phenyl sodium diacetate are used as matrix materials, the hydrothermal method is adopted, the activated sludge with strong cohesiveness is used as a raw material, and the activated sludge not only contains organic matters such as protein, fat and polysaccharide, and has good cohesiveness, but also has good heat value. The dehydrated activated sludge as the adhesive can improve the strength of the granular fuel, so that the sludge is treated in the high-temperature gasification furnace, not only pollution is prevented, but also the sludge is a loosening agent, the porosity structure of the granular fuel can be improved, the gasification reactivity of the fuel is improved, and carbon residue in ash slag is reduced. The activated sludge is a material containing a large amount of organic matters, the content of volatile components is high, and the volatile components are rapidly decomposed and escaped under high-temperature heating, so that the granular fuel forms a good loose structure, the porosity and the inner surface of the granular fuel are increased, and the gasification activity of the granular fuel is greatly improved; the plant straw powder is rich in bioactive substances such as phytosterol, amino acid, flavonoid compounds, polysaccharide and the like. The phytosterol comprises sitosterol, campesterol, brassicasterol and the like, the sterol substances belong to low-polarity compounds, amino acid is used as a basic composition unit of protein, the functions of directly removing free radicals, resisting mildew, viruses and bacteria are achieved, the bamboo shoot liquid contains rich amino acid, polysaccharide, flavone glycoside and other water-soluble components with ageing resistance, the combustion performance and the moisture resistance of the granular fuel are indirectly improved, separation, classification and purification are carried out in a membrane bioreactor controlled according to the interception amount, and the polyhydroxy fatty acid ester active sludge mixture containing high molecules is directionally synthesized under the anaerobic condition. Ammonia nitrogen from stably digested sludge is subjected to biological activity treatment, a combustible polyhydroxyalkanoate activated sludge mixture is provided, the waterproof performance is greatly improved due to the positioning biosynthesis of a long-chain high-molecular compound, and a small amount of polyethylene glycol nitrate has good compatibility with biomass fuel particles, so that the waterproof performance of the granular fuel is indirectly improved due to the molecular polarity, and the granular fuel is a combustion improver and is promoted to burn quickly. And the heat value of the granular fuel is further improved by better synergistic cooperation of the hydrothermal reaction and the nitrified sludge of the activated sludge. The raw materials are widely available, the plant straw powder is from the plant resources which are frequently discarded in life, the cost is low, the preparation method is simple, the moisture-proof performance is realized, and the granular fuel has longer service life.

Compared with the prior art, the invention has the following advantages:

the invention discloses a biomass granular fuel, which is characterized in that when in actual use, biomass energy active sludge, nitrified sludge and plant straw powder are organically combined for use, the produced biomass granular fuel has good caking property, high heat value, high combustion efficiency and little combustion pollution, is beneficial to the construction of ecological environment, and the proper addition of some charcoal slag powder can enhance the combustion effect and improve the heat value of combustion.

Detailed Description

Example 1

The invention is realized by the following technical scheme:

step one, hydrothermal treatment of modified activated sludge:

adding water into 93 parts of modified activated sludge by weight to enable the water content of the modified activated sludge to be 71.2%, crushing 138 parts of plant straw powder and 5.4 parts of ethylenediamine di-o-phenyl sodium diacetate to 400 meshes, crushing 31 parts of charcoal slag powder to 300 meshes, and preparing 20 parts of edible alkaline water with the mass fraction of 5% for later use; uniformly mixing the crushed mixture of the plant straw powder and the ethylenediamine di-o-phenyl sodium diacetate with edible alkaline water, and stacking for 10 hours to obtain a mixture A; uniformly mixing the mixture A with the obtained modified activated sludge, charcoal slag powder and an active agent, then heating the mixture in a microwave hydrothermal kettle at 200 ℃ for 1.5-2 h while stirring, cooling, preserving heat for 0.8h after cooling to 105 ℃, and cooling to obtain a hydrothermal treated mixture B, wherein the microwave heating frequency is 2500 MHz;

step two, fixed transformation of digested sludge

105 parts of nitrosation sludge with stable property is taken and placed in a membrane bioreactor, 1 cycle is carried out under the anaerobic condition that the pH is 7.1, the DO is 0.6mg/L, the temperature is 20 ℃, and the ammonia nitrogen concentration is 180mg/L, each cycle is 4 h/day, then the effluent filtrate is centrifuged for 10 minutes at 5000r/min, the solid is taken and dried in a vacuum drying box at 30 ℃ to obtain nitration sludge containing 20 percent of water, the nitration sludge is placed in a ball mill to be ground into 100-mesh powdery fine particles, in addition of acetone, the weight ratio of the nitration sludge to the acetone is 1: 5, and the nitration sludge and the acetone are placed in a high-speed mixer and fully mixed; carrying out ultrasonic treatment on the uniformly mixed sample, wherein the working frequency of ultrasonic waves is 30kHz, the treatment time is 8 minutes, then placing the sample in a constant-temperature water bath reaction kettle at 25 ℃, adding water bath, oscillating for 30 minutes, oscillating for 180 times/minute, carrying out 2 cycles under the anaerobic condition that the pH is 8.2, the DO is 0.6-0.8 mg/L, the temperature is 23 ℃, and the ammonia nitrogen concentration is 250mg/L, collecting sludge residues after the reaction is finished, and airing to obtain an active sludge mixture containing the energy polyhydroxyalkanoate;

step three, preparation of damp-proof high-energy biomass granular fuel

And (3) uniformly mixing the mixture B obtained in the step one after the hydrothermal treatment, the mixture containing the energy polyhydroxyalkanoate activated sludge obtained in the step two and the polyethylene glycol nitrate according to the weight ratio of 2: 1: 0.01, and granulating to obtain the moisture-proof high-energy biomass granular fuel.

Further, the modified activated sludge in the step (1) is activated sludge subjected to alkali catalytic modification treatment, and the specific modification method comprises the following steps: taking out the biological activated sludge precipitated in the sedimentation tank, drying and dehydrating the biological activated sludge in the shade, adding quicklime accounting for 5 percent of the total weight of the activated sludge after the dehydrated activated sludge has the water content of 52.5 percent, uniformly stirring, then aging, dry distilling and activating in a high temperature reaction furnace under nitrogen atmosphere to volatilize part of biological organic matter, alkalifying and pyrolyzing the activated sludge to obtain the activated sludge, aging at 150 ℃ for 100min in a 315nm ultraviolet aging box, at 400 ℃ for 15min, activating by introducing acetic acid vapor, at 350 ℃ for 15min, the temperature of the acetic acid steam is 280 ℃, and the mass concentration of acetic acid in the acetic acid steam is 10%.

Further, the active agent in the step one comprises 28 parts of ferrocene, 2.1 parts of sodium dodecyl benzene sulfonate, 1.8 parts of glycerol and 13 parts of sodium citrate.

Further, the nitrite accumulation rate of the nitrified sludge in the second step is 55%.

Further, the polyethylene glycol nitrate in the third step is obtained by carrying out nitration reaction on polyethylene glycol in a mixture of nitric acid and diethyl ether, wherein the content of a nitration group accounts for 10%, and the relative molecular mass is 20000.

Further, the plant straw powder in the first step is tortoise shell and dragon stem powder, dragon bone powder, perennial drynaria and peanut straw.

Example 2

The invention is realized by the following technical scheme:

step one, hydrothermal treatment of modified activated sludge:

adding water into 82 parts of modified activated sludge according to parts by weight to enable the water content of the modified activated sludge to be 67.3%, crushing 115 parts of plant straw powder and 2.1 parts of ethylenediamine di-o-phenyl sodium diacetate to 400 meshes, crushing 22 parts of charcoal slag powder to 300 meshes, and preparing 15 parts of edible alkaline water with the mass fraction of 2% for later use; uniformly mixing the crushed mixture of the plant straw powder and the ethylenediamine di-o-phenyl sodium diacetate with edible alkaline water, and stacking for 6 hours to obtain a mixture A; uniformly mixing the mixture A with the obtained modified activated sludge, charcoal slag powder and an active agent, then heating the mixture in a microwave hydrothermal kettle at 180 ℃ for 1.5 hours while stirring, cooling, and then preserving heat for 0.8 hour after cooling to 100 ℃, and cooling to obtain a hydrothermal treated mixture B, wherein the microwave heating frequency is 2400-2500 MHz;

step two, fixed transformation of digested sludge

100-115 parts of nitrosation sludge with stable properties are taken and placed in a membrane bioreactor, 1-2 periods are carried out under the anaerobic condition that the pH is 7.1, the DO is 0.4mg/L, the temperature is 16 ℃ and the ammonia nitrogen concentration is 160mg/L, each period is 2-4 h/day, then the effluent filtrate is centrifuged for 2 minutes at 4000r/min, the solid is taken and dried in a vacuum drying box at 30 ℃ to obtain nitration sludge containing 16-20% of water, the nitration sludge is placed in a ball mill to be ground into fine particles of 40-100 meshes of powder, the weight ratio of the nitration sludge to the acetone is 1: 5 in the addition of acetone, and the nitration sludge and the acetone are placed in a high-speed mixer and fully mixed; carrying out ultrasonic treatment on the uniformly mixed sample, wherein the working frequency of ultrasonic waves is 20kHz, the treatment time is 4 minutes, then placing the sample into a constant-temperature water bath reaction kettle at the temperature of 20-25 ℃, adding water bath, oscillating for 20 minutes, oscillating for 180 times/minute, carrying out 2 cycles under the anaerobic condition that the pH is 7.5, the DO is 0.6mg/L, the temperature is 23 ℃, and the ammonia nitrogen concentration is 250mg/L, collecting sludge residues after the reaction is finished, and airing to obtain an active sludge mixture containing the energy polyhydroxyalkanoate;

step three, preparation of damp-proof high-energy biomass granular fuel

And (3) uniformly mixing the mixture B obtained in the step one after the hydrothermal treatment, the mixture containing the energy polyhydroxyalkanoate activated sludge obtained in the step two and the polyethylene glycol nitrate according to the weight ratio of 5: 1: 0.01, and granulating to obtain the moisture-proof high-energy biomass granular fuel.

Further, the modified activated sludge in the step (1) is activated sludge subjected to alkali catalytic modification treatment, and the specific modification method comprises the following steps: taking out the biological activated sludge precipitated in the sedimentation tank, drying and dehydrating the biological activated sludge in the shade, adding quicklime accounting for 5 percent of the total weight of the activated sludge after the dehydrated activated sludge has the water content of 48.5 percent, uniformly stirring, then aging, dry distilling and activating treatment are carried out in a high-temperature reaction furnace under the nitrogen atmosphere to volatilize part of biological organic matters, the activated sludge is obtained after alkalization and pyrolysis, the aging temperature is 120 ℃, the aging is carried out in an ultraviolet aging box with the wavelength of 315nm for 50min, the dry distilling temperature is 310 ℃, the dry distilling time is 5min, the activation is carried out by introducing acetic acid steam, the activation temperature is 200 ℃, the activation time is 10-15 min, the temperature of the acetic acid steam is 230 ℃, and the mass concentration of acetic acid in the acetic acid steam is 10%.

Further, the active agent in the step one is composed of 28 parts of ferrocene, 2.1 parts of sodium dodecyl benzene sulfonate, 1.8 parts of glycerol and 10 parts of sodium citrate.

Further, the polyethylene glycol nitrate in the third step is obtained by carrying out nitration reaction on polyethylene glycol in a mixture of nitric acid and diethyl ether, wherein the content of a nitration group accounts for 5%, and the relative molecular mass is 20000.

Comparative example 1

This comparative example 1 compares to example 1 in that no sodium ethylenediamine-di-o-phenylglycinate was added in step one except that the process steps were the same.

Comparative example 2

Compared with the example 2, in the comparative example 2, the plant straw powder is not added in the step one, except that the steps of the method are the same.

Comparative example 3

In this comparative example 3, compared to example 2, no charcoal ash was added in step one, except that the process steps were the same.

Comparative example 4

In this comparative example 4, as compared with example 2, no edible alkaline water was added in the second step, except that the steps of the method were the same.

Comparative example 5

This comparative example 5 compares to example 2 with no activator added in step one, except that the process steps are otherwise the same.

Comparative example 6

This comparative example 6 compares to example 2 in that no polyethylene glycol nitrate was added in step three, except that the process steps were otherwise the same.

Table 1 results of performance test of biomass pellet fuel of examples and comparative examples

Note: reference is made to GB/T213 coal calorific value measurement method unit Qnet. A method for measuring total sulfur in GB/T214 coal; NY/T18812 Biomass solid briquette fuel test method part 2 total moisture; NY/T18814 Biomass solid shaped Fuel test method part 4 volatile NY/T18815 Biomass solid shaped Fuel test method part 5; and detecting the ash DB11/T541-2008 biomass briquette fuel.

The biomass granular fuel material prepared by the method disclosed by the embodiment of the invention has the excellent properties of high heat value and moisture resistance.

Claims

1. A preparation method of a damp-proof high-energy biomass granular fuel is characterized by comprising the following steps:

step one, hydrothermal treatment of modified activated sludge:

adding water into 82-93 parts by weight of modified activated sludge to enable the water content of the modified activated sludge to be 67.3-71.2%, crushing 115-138 parts by weight of plant powder and 2.1-5.4 parts by weight of ethylenediamine di-o-phenyl sodium diacetate to 300-400 meshes, crushing 22-31 parts by weight of charcoal slag powder to 100-300 meshes, and preparing 15-20 parts by weight of edible alkaline water with the mass fraction of 2-5% for later use; uniformly mixing the crushed mixture of the plant powder and the ethylenediamine di-o-phenyl sodium diacetate with edible alkaline water, and stacking for 6-10 hours to obtain a mixture A; uniformly mixing the mixture A with the obtained modified activated sludge, charcoal slag powder and an active agent, then heating the hydrothermal kettle by microwaves while stirring to ensure that the temperature in the hydrothermal kettle is 180-200 ℃, cooling after processing for 1.5-2 h, preserving heat for 0.5-0.8 h after cooling to 100-105 ℃, and obtaining a mixture B after cooling, wherein the microwave heating frequency is 2400-2500 MHz;

step two, the fixed transformation of the digested sludge:

100-115 parts of nitrosation sludge with stable properties are taken and placed in a membrane bioreactor to react for 1-2 periods under the anaerobic condition that the pH is 7.1-7.6, the DO is 0.4-0.6 mg/L, the temperature is 16-20 ℃ and the ammonia nitrogen concentration is 160-180 mg/L, each period is 2-4 h/day, then the effluent filtrate is centrifuged for 2-10 minutes at 4000-5000 r/min, the solid is taken and dried in a vacuum drying box at 20-30 ℃ in the shade to obtain nitration sludge with water content of 16-20%, the nitration sludge is placed in a ball mill to be ground into powder particles of 40-100 meshes, then acetone is added to ensure that the weight ratio of the nitration sludge to the acetone is 1: 2-5, and the nitration sludge and the acetone are placed in a high-speed mixer and fully mixed; carrying out ultrasonic treatment on the uniformly mixed sample, wherein the working frequency of ultrasonic waves is 20-30 kHz, the treatment time is 4-8 minutes, then placing the sample in a constant-temperature water bath reaction kettle at the temperature of 20-25 ℃, oscillating for 20-30 minutes, oscillating for 150-180 times/minute, then carrying out 1-2 cycles under the anaerobic condition that the pH is 7.5-8.2, the DO is 0.6-0.8 mg/L, the temperature is 20-23 ℃, and the ammonia nitrogen concentration is 235-250 mg/L, wherein each cycle is 1-2 h/day, collecting sludge residues after the reaction is finished, and airing to obtain an active sludge mixture containing the energy polyhydroxyalkanoate;

step three, preparing the moistureproof high-energy biomass granular fuel:

2. The preparation method of the damp-proof high-energy biomass granular fuel as claimed in claim 1, wherein the modified activated sludge in the step (1) is activated sludge subjected to alkali catalytic modification treatment, and the modification method comprises the steps of taking out the biological activated sludge precipitated in a precipitation tank, drying and dehydrating the taken-out biological activated sludge in the shade, adding quicklime accounting for 2-5% of the total weight of the activated sludge after the water content of the dehydrated activated sludge is 48.5-52.5%, uniformly stirring, aging, performing dry distillation and activation treatment in a high-temperature reaction furnace under nitrogen atmosphere to volatilize part of biological organic matters, performing alkalization and pyrolysis on the activated sludge, aging in an ultraviolet aging oven of 315nm for 50-100min at the aging temperature of 120-150 ℃, the dry distillation temperature of 310-400 ℃ and the dry distillation time of 5-15 min, the activation is carried out by introducing acetic acid steam, the activation temperature is 200-350 ℃, the activation time is 10-15 min, the temperature of the acetic acid steam is 230-280 ℃, and the mass concentration of acetic acid in the acetic acid steam is 5-10%.

3. The preparation method of the moisture-proof high-energy biomass granular fuel as claimed in claim 1, wherein the active agent in the first step is composed of 20-28 parts of ferrocene, 1.5-2.1 parts of sodium dodecyl benzene sulfonate, 1.5-1.8 parts of glycerol and 10-13 parts of sodium citrate.

4. The preparation method of the moisture-proof high-energy biomass granular fuel as claimed in claim 1, wherein the nitrite accumulation rate of the nitrified sludge in the second step is 49-55%.

5. The preparation method of the moisture-proof high-energy biomass granular fuel as claimed in claim 1, wherein the polyethylene glycol nitrate in the third step is obtained by nitration of polyethylene glycol in a mixture of nitric acid and diethyl ether, the content of a nitrated group is 5-10%, and the relative molecular mass is 1000-20000.

6. The method for preparing the moisture-proof high-energy biomass granular fuel as claimed in claim 1, wherein the plant powder in the first step is one or more of tortoise shell and dragon bone powder, xerophyte, peanut straw.