CN113604265A

CN113604265A - Environment-friendly biomass fuel and production process thereof

Info

Publication number: CN113604265A
Application number: CN202111056003.3A
Authority: CN
Inventors: 崔学武
Original assignee: Tangshan Huayi Biomass Fuel Co ltd
Current assignee: Tangshan Huayi Biomass Fuel Co ltd
Priority date: 2021-09-09
Filing date: 2021-09-09
Publication date: 2021-11-05
Anticipated expiration: 2041-09-09
Also published as: CN113604265B

Abstract

The invention discloses an environment-friendly biomass fuel and a preparation method thereof, wherein agricultural and forestry wastes with high grease content are used as biomass matrix raw materials, and are subjected to enzymolysis, fermentation, supercritical treatment, curing and foaming, then mixed with a filler, and subjected to compression molding, substances harmful to the environment are not generated in the preparation process, and the obtained biomass fuel is environment-friendly and efficient, has excellent combustion performance, high calorific value, low smoke dust, good coking and slagging resistant effect, has slight fruity flavor during combustion, and does not generate pungent smell.

Description

Environment-friendly biomass fuel and production process thereof

Technical Field

The invention belongs to the technical field of biological energy, and particularly relates to an environment-friendly biomass fuel and a production process thereof.

Background

The biomass fuel is characterized in that biomass materials are combusted to serve as fuel, but the biomass materials, such as straw, furfural, bagasse and the like, are directly combusted to generate high-pollution substances, and the high-pollution substances are contrary to the social development requirements of high efficiency, environmental protection and sustainable development. Therefore, in practical application, the biomass fuel is mainly biomass Briquette (BMF), which is a novel clean fuel that is prepared by processing agricultural and forestry waste materials in a series of processes and can be directly combusted in various shapes.

The agricultural and forestry wastes of the commonly used biomass fuel, such as most used straws, have high contents of inorganic elements such as K, Na, Cl, S, Ca, Si, P and the like, and are easy to cause coking and slagging in the combustion process. Patent CN 107365609B provides a biomass rod fuel with excellent anti-slagging performance and a preparation method thereof, however, the components of the biomass rod fuel are added with various raw materials containing heavy metal elements, such as lanthanum oxide, copper sulfate, ferric chloride, manganese oxide, copper nitrate, cobalt nitrate, etc., during combustion, smoke is large, heavy metal components are released into the environment, and are difficult to be utilized by organisms, which causes serious environmental pollution.

Disclosure of Invention

The biomass raw material contains high content of inorganic elements, which is a main reason for slagging of the biomass fuel. Aiming at the defects in the prior art, the invention provides an environment-friendly biomass fuel production process, which comprises the following steps:

(1) according to the weight parts, 70-90 parts of biomass matrix and 3-10 parts of filler are put into a mixer and stirred for 30-60min at 500rpm under 300-;

(2) extruding the premix by a molding granulator to obtain a product with a density of 0.8-1.2g/cm³The biomass fuel has the diameter of 8-10mm and the moisture content of 3-5 wt%.

The filler is prepared from chlorite and tourmaline according to the mass ratio of 3: (2-5).

The chlorite can improve the ash fusion point of the biomass matrix and reduce slag bonding, but has good expansibility and is easy to generate smoke dust during combustion. The negative ions generated by the tourmaline can capture and adsorb the particle pollutants, thereby reducing the pollution of the particle pollutants generated by expansion during combustion to the environment and reducing the generation amount of smoke dust.

The preparation method of the biomass matrix comprises the following steps:

cleaning and airing litchi shells, litchi seeds, durian shells, durian kernels, longan shells, longan seeds, pomegranate peels and pomegranate seeds, respectively crushing and sieving by a sieve of 10-40 meshes to obtain litchi shell powder, litchi seed powder, durian shell powder, durian kernel powder, longan shell powder, longan seed powder, pomegranate peel powder and pomegranate seed powder, and mixing and stirring uniformly to obtain the biomass matrix.

The biomass matrix comprises litchi shell powder, litchi seed powder, durian shell powder, durian seed powder, longan shell powder, longan seed powder, pomegranate rind powder and pomegranate seed powder in a mass ratio of (10-20): (15-35): (30-50): (20-40): (10-20): (10-25): (15-30): (10-20).

Preferably, the preparation method of the biomass matrix comprises the following steps:

s1: cleaning and airing litchi shells, litchi seeds, durian shells, durian kernels, longan shells, longan seeds, pomegranate peels and pomegranate seeds, respectively crushing and sieving by a sieve of 10-40 meshes to obtain litchi shell powder, litchi seed powder, durian shell powder, durian kernel powder, longan shell powder, longan seed powder, pomegranate peel powder and pomegranate seed powder, and mixing and stirring uniformly to obtain matrix powder;

the matrix powder comprises litchi shell powder, litchi seed powder, durian shell powder, durian seed powder, longan shell powder, longan seed powder, pomegranate rind powder and pomegranate seed powder in a mass ratio of (10-20): (15-35): (30-50): (20-40): (10-20): (10-25): (15-30): (10-20).

S2: mixing base powder according to a material-liquid ratio of 1 g: (5-14) soaking the mixture in water to obtain a mixed solution I, adding 0.5-1% of hydrolase by weight of the mixed solution I, reacting at normal temperature for 4-6h, adding 0.2-0.6% of microorganism by weight of the mixed solution I, placing in a transparent fermentation tank, standing in the open, and fermenting at 22-26 ℃ for 1-3d to obtain a matrix fermentation liquid;

the hydrolase is a mixture of cellulase, hemicellulase and ligninase.

Preferably, the hydrolase is cellulase, hemicellulase and ligninase according to the mass ratio of (3-5): (1-2): (5-8).

The microorganism is a mixture of a fermentation microorganism and oil-producing microalgae.

Preferably, the oil-producing microalgae is Isochrysis galbana.

The fermentation microorganism is saccharomyces cerevisiae and/or fusarium oxysporum.

Preferably, the fermentation microorganism is prepared from saccharomyces cerevisiae and fusarium oxysporum according to a mass ratio of 1: (1.5-3).

S3: pouring the matrix fermentation liquor into supercritical CO₂In the device, ethanol with the weight of 30-50% of the weight of the matrix fermentation liquid is added for static reaction for 50-120min at the reaction temperature of 200 ℃ and the pressure of 10-30Mpa, and after the reaction is finished and the temperature is naturally cooled to the room temperature, the supercritical CO is added₂Discharging the device to normal pressure, and respectively collecting the extracting solution and the solid residue;

s4: adding 25 wt% of ammonia water into the extracting solution obtained in the step S3, wherein the volume ratio of the extracting solution to the 25 wt% of ammonia water is 1: (0.4-1), standing and layering after stirring, mixing the upper layer liquid with the solid residue obtained in the step S3, and standing for 1-2 hours to obtain a reaction product;

s5: and (3) drying the reaction product in an oven at 75-100 ℃ to obtain the biomass matrix.

The biomass raw material is treated by adopting a synchronous saccharification and co-fermentation method, the molecular weight of lignocellulose in the matrix is reduced by enzymolysis and fermentation, and the combustibility is improved. The abundant cellulose, hemicellulose and lignin in the matrix powder are decomposed into monosaccharides such as glucose and xylose under the action of hydrolase, so as to provide nutrients for the growth and metabolism of microorganisms, and the saccharomyces cerevisiae mainly utilizes the glucose as a substrate to ferment and generate a large amount of carbon dioxide, ethanol and a small amount of esters, so that inorganic salts and other components which are easy to cause slagging phenomenon are promoted to be dissolved out of the matrix structure; supercritical CO at high temperature₂Under the conditions, the alcohol and the rich grease of the matrix powder can be subjected to in-situ transesterification by a one-step method to generate the biomass fuel with high added value: biodiesel. In the supercritical pressure relief process, liquid components such as biodiesel, alcohol, acid, ester and the like are discharged from a matrix structure to form an extracting solution, the extracting solution is treated by ammonia water to obtain upper-layer liquid (refined biodiesel), meanwhile, pores in solid residues are enlarged after supercritical reaction, and when the solid residues are mixed with the upper-layer liquid, the biodiesel can be adsorbed and uniformly distributed in the obtained biomass matrix, so that the combustion performance of the biomass matrix is obviously improved. The biodiesel has high oxygen content, basically contains no sulfur, reduces pollution and improves the heat value of the biomass fuel. The lower layer liquid containing most inorganic salt can be removed by ammonia water treatment, and the slagging phenomenon is reduced. The oil-producing microalgae can absorb carbon dioxide through photosynthesis to generate oil, so that the oil content of the matrix fermentation liquor can be increased, and the biodiesel content can be further increased. When the saccharomyces cerevisiae and the oil-producing microalgae are used in a mixed mode, mutual promotion is achieved, metabolites of the saccharomyces cerevisiae provide sufficient carbon sources for photosynthesis of the oil-producing microalgae, oil production of the oil-producing microalgae is promoted, the yield of biodiesel is improved, the heat value of biomass fuel is further improved, the photosynthesis of the oil-producing microalgae provides oxygen required for propagation of the saccharomyces cerevisiae, growth of the saccharomyces cerevisiae is promoted, and the generation speed of the metabolites is further improved.

Fusarium oxysporum can effectively utilize glucose and xylose to produce ethanol by fermentation, and generally has antagonistic action with Saccharomyces cerevisiae. In experiments, the unexpected discovery that the biomass fuel prepared by simultaneously using the fusarium oxysporum and the saccharomyces cerevisiae for fermentation has better properties. Fusarium oxysporum is preferentially fermented by using glucose in an environment where glucose and xylose exist at the same time to produce ethanol, and is in a competitive relationship with saccharomyces cerevisiae at the moment. Because the invention adopts the synchronous saccharification and co-fermentation method, the glucose consumption speed is high, the system is easy to maintain at a low glucose level, and the forward progress of the enzymolysis reaction is promoted. The low glucose level also promotes fusarium oxysporum to ferment by utilizing xylose, further promotes the enzymolysis reaction, improves the conversion rate of wood fiber and improves the content of ethanol. On the other hand, the saccharomyces cerevisiae fermentation metabolite also contains organic acids, so that the pH of the system is reduced, on the contrary, the fusarium oxysporum fermentation metabolite is alkaline, so that the pH of the system is increased, the fusarium oxysporum fermentation metabolite and the saccharomyces cerevisiae fermentation metabolite are neutralized, the pH value of the system is maintained in a relatively stable range, the oil-producing microalgae is ensured to keep higher bioactivity, the oil yield is improved, and the biodiesel yield is improved.

Supercritical CO at high temperature₂In the environment, part of substances in the reaction product are carbonized, the heat value is high, the structure is loose, and the flammability is improved.

Further preferably, the preparation method of the biomass matrix comprises the following steps:

the hydrolase is a mixture of cellulase, hemicellulase and ligninase.

Preferably, the oil-producing microalgae is Isochrysis galbana.

s5: putting the reaction product into a condensation reflux device, adding water and a curing agent, stirring at 500rpm for 3-7min at 200-: (10-20): (4-8): (5-10);

the curing agent is a stone flower seed glue.

The preparation method of the stone flower seed gum comprises the following steps:

at room temperature, the mixture of the lithospermum seeds in a weight ratio of 1 g: (20-50) soaking in water for 15-30min, extracting under the ultrasonic conditions of 25-40kHz and 200-400W for 8-15min, stirring at 600rpm of 300-10 min, filtering, taking out filter residue, and freeze-drying the filtrate to obtain the agar seed gum.

The foaming agent is calcium bicarbonate.

S6: pouring out the foamed matrix while the foamed matrix is hot, and placing the foamed matrix in an oven for drying at 75-100 ℃ to obtain the biomass matrix.

CO-fermenting by simultaneous saccharification and supercritical CO₂Most of lignocellulose in the solid residue obtained by the in-situ transesterification treatment is degraded into a combustible small molecular structure. Adding agar seed gum, absorbing liquid, swelling, combining with foaming agent calcium bicarbonate to form solid gel, coating and fixing biodiesel in the extractive solution on the solid structure of biomass matrix, and decomposing calcium bicarbonate under heating to generate CO₂And calcium carbonate solids, CO₂The generation of (a) and the gelling process occur simultaneously, and the formed gel has abundant pores. The calcium carbonate also has the function of sulfur fixation, and the sulfur-fixing agent is not required to be added separately, so that the emission of sulfur dioxide is reduced. After drying, the gel shrinks into a skeleton with certain mechanical strength, and the skeleton is supported to form a loose porous biomass matrix, so that the components such as biodiesel are firmly and uniformly distributed in the biomass matrix. After being extruded and formed by a granulator, the heat value is improved, the contact with oxygen is increased, the generation of carbon monoxide is reduced, the burnout rate is improved, smoke dust and coking slag bonding are reduced, and the environmental pollution is reduced.

Has the advantages that: the biomass fuel is prepared by mixing the agricultural and forestry wastes with high grease content as a biomass matrix raw material with a filler after enzymolysis, fermentation, supercritical treatment, solidification and foaming, and then performing compression molding.

Detailed Description

The raw materials used in the examples were as follows:

the litchi rind, litchi seed, durian rind, durian seed, longan rind, longan seed, pomegranate rind, pomegranate seed are obtained by extracting rind and seed from commercially available litchi, durian, longan, pomegranate.

The Litchi (Litchi chinensis Sonn.) variety is March red.

The durian (Durio zibethinus Murr) is golden pillow.

The longan (Dimocarpus longan Long.) is of the variety of the ancient mountain II.

The pomegranate (Punica grandium L.) is jade seed.

Tourmaline with purity of 99 percent and granularity of 600 meshes, and a processing plant for Shengtai mineral products in Lingshou county.

Chlorite, 325 mesh in granularity, Lingshou county Shuolong product processing plant, with a cargo number of sl-9852.

Fusarium oxysporum (Fusarium oxysporum), China center for agricultural microbial culture Collection, accession number ACCC 30373.

Saccharomyces cerevisiae (Saccharomyces cerevisiae), China center for Industrial culture Collection of microorganisms, accession number CICC 13009.

Isochrysis galbana (Isochrysis galbana), Hakkaido Biotech, Inc., number GY-D66.

The cellulase, Chengdu Wanxiang Hongrun Biotechnology Co Ltd, has an active substance content of 99%, an enzyme activity of 10 ten thousand U/g, and an enzyme activity preservation rate of 99%.

The hemicellulase, a grand elephant and macro-moisture biotechnology limited company, has the effective substance content of 99 percent, the enzyme activity of 10 ten thousand U/g and the enzyme activity preservation rate of 99 percent.

Lignin enzyme, Shandonogejie Biotech Co., Ltd., enzyme activity of 1 ten thousand U/g, and enzyme activity preservation rate of 99.99%.

Geranium seed (Nicandra physiaoides (L) Gaertn) is commercially available.

Example 1

The production process of the environment-friendly biomass fuel comprises the following steps:

(1) putting 85 parts of biomass matrix and 7 parts of filler into a mixer by weight, and stirring at 400rpm for 50min to obtain uniformly mixed premix;

(2) extruding and molding the premix by a molding granulator to obtain the premix with the density of 1.0g/cm³And the biomass fuel has the diameter of 8mm and the moisture content of 4wt percent.

The filler is prepared from chlorite and tourmaline according to the mass ratio of 3: 4.

The preparation method of the biomass matrix comprises the following steps:

cleaning and airing litchi shells, litchi seeds, durian shells, durian kernels, longan shells, longan seeds, pomegranate peels and pomegranate seeds, respectively crushing and sieving by a 30-mesh sieve to obtain litchi shell powder, litchi seed powder, durian shell powder, durian kernel powder, longan shell powder, longan seed powder, pomegranate peel powder and pomegranate seed powder, wherein the mass ratio of the litchi shell powder, litchi seed powder, durian shell powder, durian kernel powder, longan seed powder, pomegranate peel powder and pomegranate seed powder is 15: 20: 40: 30: 18: 20: 25: 18, mixing and stirring evenly to obtain the biomass matrix.

Example 2

The preparation method of the biomass matrix comprises the following steps:

s1: cleaning and airing litchi shells, litchi seeds, durian shells, durian kernels, longan shells, longan seeds, pomegranate peels and pomegranate seeds, respectively crushing and sieving by a 30-mesh sieve to obtain litchi shell powder, litchi seed powder, durian shell powder, durian kernel powder, longan shell powder, longan seed powder, pomegranate peel powder and pomegranate seed powder, wherein the mass ratio of the litchi shell powder, litchi seed powder, durian shell powder, durian kernel powder, longan seed powder, pomegranate peel powder and pomegranate seed powder is 15: 20: 40: 30: 18: 20: 25: 18, mixing and stirring evenly to obtain matrix powder.

S2: mixing base powder according to a material-liquid ratio of 1 g: immersing 10mL of the solution in water to obtain a mixed solution I, and pouring the mixed solution I into supercritical CO₂Adding 40 wt% ethanol into the mixed solution I, and statically reacting for 80min at 230 deg.CThe pressure is 25Mpa, after the reaction is finished, the supercritical CO is naturally cooled to the room temperature₂Discharging the device to normal pressure, and respectively collecting the extracting solution and the solid residue;

s3: adding 25 wt% of ammonia water into the extracting solution obtained in the step S2, wherein the volume ratio of the extracting solution to the 25 wt% of ammonia water is 1: 0.6, standing and layering after stirring, mixing the upper layer liquid with the solid residue obtained in the step S2, and standing for 2 hours to obtain a reaction product;

s4: and (3) drying the reaction product in an oven at 80 ℃ for 24h to obtain the biomass matrix.

Example 3

The preparation method of the biomass matrix comprises the following steps:

S2: mixing base powder according to a material-liquid ratio of 1 g: immersing 10mL of the mixture in water to obtain a mixed solution I, adding hydrolase with the weight of 0.8% of the mixed solution I, reacting for 6 hours at normal temperature, adding microorganisms with the weight of 0.4% of the mixed solution I, placing the mixture in a transparent fermentation tank in the open, and fermenting for 2 days at 25 ℃ to obtain a matrix fermentation liquid;

the hydrolase is cellulase, hemicellulase and ligninase according to a mass ratio of 4: 1: 6.

The microorganism is prepared from fermentation microorganism and dinoflagellate such as a ball in a mass ratio of 6: 5.

The fermentation microorganism is saccharomyces cerevisiae.

S3: pouring the matrix fermentation liquor into supercritical CO₂Adding ethanol 40 wt% of the matrix fermentation liquid into the device, statically reacting for 80min at 230 deg.C and 25Mpa, naturally cooling to room temperature, and adding supercritical CO₂Discharging the device to normal pressure, and respectively collecting the extracting solution and the solid residue;

s4: adding 25 wt% of ammonia water into the extracting solution obtained in the step S3, wherein the volume ratio of the extracting solution to the 25 wt% of ammonia water is 1: 0.6, standing and layering after stirring, mixing the upper layer liquid with the solid residue obtained in the step S3, and standing for 2 hours to obtain a reaction product;

s5: and (3) drying the reaction product in an oven at 80 ℃ for 24h to obtain the biomass matrix.

Example 4

The preparation method of the biomass matrix comprises the following steps:

s1: cleaning and airing litchi shells, litchi seeds, durian shells, durian kernels, longan shells, longan seeds, pomegranate peels and pomegranate seeds, respectively crushing and sieving by a 30-mesh sieve to obtain litchi shell powder, litchi seed powder, durian shell powder, durian kernel powder, longan shell powder, longan seed powder, pomegranate peel powder and pomegranate seed powder, wherein the mass ratio of the litchi shell powder, litchi seed powder, durian shell powder, durian kernel powder, longan seed powder, pomegranate peel powder and pomegranate seed powder is 15: 20: 40: 30: 18: 20: 25: 18, mixing and stirring uniformly to obtain matrix powder;

The fermentation microorganism is saccharomyces cerevisiae.

s5: putting the reaction product into a condensation reflux device, adding water and a curing agent into the condensation reflux device, stirring at 300rpm for 5min, heating to 60 ℃, adding a foaming agent, continuously stirring for 1min, standing at 60 ℃ for foaming for 1h to obtain a foaming matrix, wherein the mass ratio of the reaction product to the water to the curing agent to the foaming agent is 100: 15: 5: 7;

the curing agent is a stone flower seed glue.

at room temperature, the mixture of the lithospermum seeds in a weight ratio of 1 g: soaking 30mL of the material liquid in water for 20min, extracting for 10min under the ultrasonic condition of 25kHz and 200W, stirring for 5min at 500rpm, filtering, taking out filter residue, and freeze-drying the filtrate to obtain the agar seed gum.

The foaming agent is calcium bicarbonate.

S6: pouring out the foaming matrix while the foaming matrix is hot, and placing the foaming matrix in an oven at 80 ℃ for drying for 24h to obtain the biomass matrix.

Example 5

The preparation method of the biomass matrix comprises the following steps:

The fermentation microorganism is fusarium oxysporum.

S3: pouring the matrix fermentation liquor into supercritical CO₂In the apparatus, a matrix is addedStatically reacting 40 wt% ethanol in the fermentation liquid at 230 deg.C under 25Mpa for 80min, naturally cooling to room temperature, and adding supercritical CO₂Discharging the device to normal pressure, and respectively collecting the extracting solution and the solid residue;

s5: putting the reaction product into a condensation reflux device, adding water and a curing agent, stirring at 300rpm for 5min, heating to 60 ℃, adding a foaming agent, continuing stirring for 1min, standing at 60 ℃ for foaming for 1h to obtain a foamed matrix, wherein the mass ratio of the reaction product to the water to the curing agent to the foaming agent is 100: : 15: 5: 7;

the curing agent is a stone flower seed glue.

The foaming agent is calcium bicarbonate.

Example 6

The preparation method of the biomass matrix comprises the following steps:

The microorganism is prepared from fermentation microorganism and dinoflagellate such as a ball in a mass ratio of 6: 5 composition

The fermentation microorganism is prepared from saccharomyces cerevisiae and fusarium oxysporum according to a mass ratio of 1: 1.5.

s5: putting the reaction product into a condensation reflux device, adding water and a curing agent, stirring at 300rpm for 5min, heating to 60 ℃, adding a foaming agent, continuing stirring for 1min, standing at 60 ℃ for foaming for 1h to obtain a foamed matrix, wherein the mass ratio of the reaction product to the water to the curing agent to the foaming agent is 100: 15: 5: 7;

the curing agent is a stone flower seed glue.

The foaming agent is calcium bicarbonate.

Test example 1

The environment-friendly biomass fuel of the embodiment is subjected to constant volume high-order heating value test, and the test is carried out by adopting an automatic oxygen bomb calorimeter method with reference to GB/T30727-. Each case was tested on 3 replicates and the average was calculated to obtain the test results. The specific test results are shown in table 1.

Table 1 table of heat generation amount test results

The biomass raw material selected by the invention contains rich lignocellulose and grease, the prepared biomass fuel has higher heat value, and example 2 is that the biomass raw material is subjected to high-temperature supercritical CO₂Partial components are carbonized under the condition, the heat value and the porosity are improved, and simultaneously, the components and alcohol are subjected to one-step method in-situ ester exchange to generate diesel oil in a biomass matrix, so that the heat value of the biomass fuel is obviously high. Example 3 supercritical CO at high temperature₂Synchronous saccharification and co-fermentation treatment are carried out before treatment, so that the flammability is improved; the production amount of the biodiesel is increased by selecting the oil-producing microalgae such as the microalgae balls and the like, and the calorific value is higher; example 4 supercritical CO at high temperature₂Adding curing agent and hair into the treated reaction productThe foaming agent is beneficial to the forming of the biomass matrix and the fixation of the biodiesel on the biomass matrix, the formed biomass matrix is porous, has a large specific surface area, is easy to contact with oxygen in the combustion process, and has a better combustion effect and a higher heat value; example 6 mixing and fermenting saccharomyces cerevisiae and fusarium oxysporum, and improving the ethanol and oil content by the mutual cooperation of the saccharomyces cerevisiae and the fusarium oxysporum, further improving the content of biodiesel and improving the heat value of fuel.

Test example 2

The smoke emission amount and the smoke pollutant emission concentration of the environment-friendly biomass fuel are tested by referring to GB/T5468-1991 boiler smoke test method and GB/T13271-2014 boiler atmospheric pollutant emission standard, and the diameter of the circular pipeline is 180 mm. Meanwhile, refer to GBZ/T300.34-2017 workplace air noxious substances determination part 34: rare earth metals and compounds thereof, GBZ/T300.33-2017 air noxious substance determination part 33: metals and their compounds, short-time sampling is performed, 15min of each smoke gas is collected at a flow rate of 5.0L/min, and the concentrations of metals and their compounds in the smoke are measured according to the total amount of each metal measured in a reference test standard. Each case was tested on 3 replicates and the average was calculated to obtain the test results. The specific test results are shown in tables 2 and 3.

Table 2 table of smoke and dust emission test results

Table 3 table of test results of heavy metal concentration in soot rows

	Heavy metal concentration (mg/m) in smoke³)
		Example 1	1.03
Example 3	0.82
		Example 6	0.66

The negative ions generated by the tourmaline can capture and adsorb particulate pollutants and heavy metals, thereby reducing the pollution of the particulate pollutants generated by expansion during combustion to the environment and obviously reducing the discharge amount of smoke and dust and the concentration of the pollutants. The biomass raw material subjected to synchronous saccharification and co-fermentation treatment is used as a matrix to prepare the biomass fuel, the content of inorganic salt is reduced, the emission amount and concentration of smoke dust and the concentration of heavy metal in the smoke dust are obviously reduced, the content of the biodiesel in the solidified and foamed biomass matrix is increased along with the increase of the yield of the biodiesel, the combustion is more thorough due to the existence of pores, and the emission amount of the smoke dust and the emission concentration of pollutants are reduced.

Test example 3

The slagging rate of the environment-friendly biomass fuel in the embodiment is tested by referring to GB/T1572-2018 'testing method for slagging property of coal', and the content of heavy metal in the environment-friendly biomass fuel slagging in the embodiment is tested by referring to GB/T12496.22-1999 'determination method for heavy metal in wood activated carbon testing method'. The specific test results are shown in table 4.

TABLE 4 test result table of slagging condition

	Slag formation Rate (%)	Heavy metal content
			Example 1	3.1	Fail to be qualified
Example 2	2.3	Qualified
			Example 3	1.2	Qualified
Example 4	0.6	Qualified
			Example 5	0.5	Qualified
Example 6	0.3	Qualified

Through processes of synchronous saccharification and co-fermentation, supercritical in-situ transesterification, solidification and foaming and the like, the content of inorganic salt components and the molecular weight of lignocellulose are reduced, the content of biodiesel is improved, biomass fuel is fully contacted with oxygen, the flammability and the burnout rate are improved in a synergistic manner, the slagging rate is obviously reduced, and the slagging rate is further reduced in the process of converting the biomass fuel into the biomass diesel.

Claims

1. The environment-friendly biomass fuel is characterized by comprising the following raw materials in parts by weight: 70-90 parts of biomass matrix and 3-10 parts of filler.

2. The environment-friendly biomass fuel according to claim 1, wherein the preparation method of the biomass matrix comprises the following steps:

3. The environment-friendly biomass fuel according to claim 1, wherein the preparation method of the biomass matrix comprises the following steps:

s5: and drying the reaction product to obtain the biomass matrix.

4. The environment-friendly biomass fuel according to claim 1, wherein the preparation method of the biomass matrix comprises the following steps:

5. The environment-friendly biomass fuel according to any one of claims 2 to 4, wherein the biomass matrix comprises litchi shell powder, litchi seed powder, durian shell powder, durian seed powder, longan shell powder, longan seed powder, pomegranate peel powder and pomegranate seed powder in a mass ratio of (10-20): (15-35): (30-50): (20-40): (10-20): (10-25): (15-30): (10-20).

6. The environmentally friendly biomass fuel of claim 3 or 4, wherein the microorganism is a mixture of a fermenting microorganism and an oil-producing microalgae.

7. The environmentally friendly biomass fuel of claim 6, wherein the fermenting microorganism is Saccharomyces cerevisiae and/or Fusarium oxysporum.

8. The environment-friendly biomass fuel according to claim 4, wherein the curing agent is agar seed gum, and the foaming agent is calcium bicarbonate;

9. The method for preparing the environment-friendly biomass fuel as set forth in any one of claims 1 to 8, characterized by comprising the steps of:

(1) according to the weight parts, putting the biomass matrix and the filler into a mixer, and stirring at 500rpm for 30-60min at 300-;