CN114806668A - Preparation method of environment-friendly sludge solidified fuel - Google Patents
Preparation method of environment-friendly sludge solidified fuel Download PDFInfo
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- CN114806668A CN114806668A CN202210554789.XA CN202210554789A CN114806668A CN 114806668 A CN114806668 A CN 114806668A CN 202210554789 A CN202210554789 A CN 202210554789A CN 114806668 A CN114806668 A CN 114806668A
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
- C10L5/445—Agricultural waste, e.g. corn crops, grass clippings, nut shells or oil pressing residues
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
- C10L5/447—Carbonized vegetable substances, e.g. charcoal, or produced by hydrothermal carbonization of biomass
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/46—Solid fuels essentially based on materials of non-mineral origin on sewage, house, or town refuse
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/02—Combustion or pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/08—Drying or removing water
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/28—Cutting, disintegrating, shredding or grinding
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L2290/00—Fuel preparation or upgrading, processes or apparatus therefore, comprising specific process steps or apparatus units
- C10L2290/54—Specific separation steps for separating fractions, components or impurities during preparation or upgrading of a fuel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention discloses a preparation method of an environment-friendly sludge solidified fuel; the preparation method comprises the steps of mixing straw particles and municipal sludge, and then sequentially carrying out acidolysis, mesophase generation and carbonization to obtain the solidified fuel. Acidolysis, intermediate phase generation, carbonization and molding are all realized through hydrothermal reaction; adding hydrochloric acid during acidolysis; adding calcium carbonate in the intermediate phase generation; adding sorbitan oleate solution during carbonization. The method uses hydrochloric acid to carry out acidolysis on a straw-sludge mixture, and then carries out calcium carbonate combined hydrothermal reaction; on one hand, the acidity of the hydrothermal product is reduced by utilizing the reaction of calcium carbonate and hydrochloric acid, and the problem of remaining caused by acidolysis is solved. On the other hand, calcium chloride generated by the reaction of calcium carbonate and hydrochloric acid can reduce the carbonization temperature of acidolysis products so as to reduce the energy consumption of fuel production; meanwhile, the calcium carbonate is combined with hydrothermal reaction, so that micromolecular organic matters such as glucose, fructose, amino acid and the like can be promoted to generate carbon microspheres, and the heat value of the solid fuel is increased.
Description
Technical Field
The invention relates to the technical field of environmental protection and renewable energy, in particular to a preparation method of an environment-friendly sludge solidified fuel.
Background
Municipal sludge is a by-product of sewage treatment, and its composition is complex, mainly consisting of carbohydrates, proteins, lipids, lignin and ash, and in addition, it contains heavy metals, viruses, bacteria and other microorganisms, and without proper treatment it will cause secondary pollution, which will cause considerable harm to ecological safety and human health. Along with the development of domestic sewage treatment industry, the sludge production is increasing day by day, the sludge production in 2015 in China exceeds 4000 million tons, and 34 million tons of municipal solid waste are estimated to be produced in 2050 in the world every year according to the effective sewage treatment rate.
At present, the treatment method of activated sludge of sewage plants in cities and towns in China mainly comprises a landfill method, a land comprehensive utilization method and a burning method. Sludge landfill is limited by site selection and landfill capacity; the land comprehensive utilization method is usually limited by pathogenic bacteria, toxic organic matters and heavy metals in the sludge; the incineration method has the advantages of thorough treatment, large investment, high reduction degree, small occupied area, high resource utilization rate and the like compared with other two harmless treatments, but also has the problems of large investment, high running cost and the like. Therefore, in order to meet the requirements of sludge treatment at the present stage, various novel sludge treatment methods are continuously developed. Sludge carbonization is used as a novel sludge treatment technology, and the principle of the sludge carbonization is to heat carbonized sludge under the anoxic or anaerobic condition to crack organic matters in the sludge to generate combustible volatile gas mainly comprising hydrocarbon, and the sludge is dried by utilizing energy in the combustible gas, so that sludge carbide with stable chemical properties is produced by fully utilizing the self energy of the sludge.
The sludge carbonization technology has higher application value, mainly comprises low-temperature carbonization and high-temperature carbonization, and can effectively treat sludge, separate and eliminate pollutants contained in the sludge. Compared with treatment methods such as drying or direct incineration and the like, although the residual product after the treatment by the sludge carbonization technology has the advantages of high carbon content, large heat productivity and the like, the method also has the problems of relatively high energy consumption of high-temperature carbonization, loss of low-temperature carbonization heat value, easy secondary pollution of pyrolysis liquid and the like. The sludge contains a large amount of combustible organic matters and certain lignocellulose, the low calorific value is more than 11000kJ/kg, the organic matters in the sludge can be converted into clean energy, the waste reduction is realized, meanwhile, the clean energy is obtained, and the win-win situation of environment and energy can be realized. Therefore, an environment-friendly sludge solid fuel preparation method is urgently needed to realize the harmlessness, reduction and resource utilization of sludge and relieve the environmental problem and the energy problem.
Disclosure of Invention
The invention aims to provide a preparation method of an environment-friendly sludge solidified fuel aiming at the problems in the background technology. The method can not only reduce the carbonization temperature of the sludge and reduce the energy consumption, but also improve the heat value of the carbonized sludge.
In order to achieve the purpose of the invention, the technical scheme provided by the invention is as follows:
in a first aspect, the invention provides a preparation method of an environment-friendly sludge solidified fuel, which comprises the following steps:
step one, acid hydrolysis. Mixing the straw particles, municipal sludge and hydrochloric acid, and carrying out hydrothermal reaction at the temperature of 80-100 ℃.
And step two, generating an intermediate phase. And (3) adding calcium carbonate particles into the hydrothermal reaction product obtained in the first step, and carrying out hydrothermal reaction at the temperature of 140-150 ℃.
And step three, carbonizing. And (3) adding a sorbitan oleate solution into the hydrothermal reaction product obtained in the second step, and carrying out hydrothermal reaction at the temperature of 180-210 ℃ in a nitrogen atmosphere.
And step four, molding. Carrying out solid-liquid separation on the hydrothermal reaction product in the third step; and drying the obtained solid-phase product to obtain the environment-friendly sludge solidified fuel.
Preferably, the preparation process of the straw particles is as follows: cutting the straws into straw sections with the length of 20-30 mm, and drying the straw sections to constant weight; and then grinding the straw sections by a high-speed grinder, and after grinding is finished, obtaining straw particles with the particle size of less than 0.3mm by using a 20-60-mesh sample sieve.
Preferably, in the first step, the hydrothermal reaction is carried out for 30min under the condition of stirring speed of 300 rpm.
Preferably, in the second step, the hydrothermal reaction is carried out for 60min at a stirring speed of 300 rpm.
Preferably, in the third step, the hydrothermal reaction is carried out for 60min under the condition of stirring speed of 300 rpm.
Preferably, the mass ratio of the municipal sludge, the straws, the hydrochloric acid, the calcium carbonate and the sorbitan oleate solution added in each step is (28-32): (35-40): (15-20): 4-8): 5-10).
Preferably, the municipal sludge has a water content of 80%.
Preferably, the mass fraction of the hydrochloric acid is 20% to 25%.
Preferably, the mass fraction of the sorbitan oleate solution is 2.5%.
In a second aspect, the invention provides an environment-friendly sludge solidified fuel, which is obtained by mixing straw particles and municipal sludge, and then sequentially carrying out acidolysis, mesophase generation, carbonization and molding; acidolysis, intermediate phase generation and carbonization are all realized through hydrothermal reaction; adding hydrochloric acid during acidolysis; adding calcium carbonate in the intermediate phase generation; adding sorbitan oleate solution during carbonization.
The invention has the beneficial effects that:
1. the method uses hydrochloric acid to carry out acidolysis on a straw-sludge mixture, and then carries out calcium carbonate combined hydrothermal reaction; on one hand, the acidity of the hydrothermal product is reduced by utilizing the reaction of calcium carbonate and hydrochloric acid, and the problem of remaining caused by acidolysis is solved. On the other hand, the calcium chloride generated by the reaction of the calcium carbonate and the hydrochloric acid can reduce the specific resistance of the sludge, so that the dehydration performance of the sludge is improved, the water content of the sludge is reduced, and the carbon content of the fuel obtained in the subsequent carbonization process is improved; in addition, the generated calcium chloride can reduce the temperature of the sludge subjected to hydrothermal treatment (hydrothermal decomposition is carried out at the temperature of 140-150 ℃), so that the energy consumption of fuel production is reduced; meanwhile, the calcium carbonate is combined with hydrothermal reaction, so that micromolecular organic matters such as glucose, fructose, amino acid and the like can be promoted to generate carbon microspheres, and the heat value of the solid fuel is increased.
2. After the calcium carbonate is subjected to combined hydrothermal reaction, performing Span80 combined hydrothermal reaction; span80 is used as a lipophilic nonionic surfactant, and can enable an intermediate product formed after further hydrothermal decomposition of hemicellulose and lignin generated by acid hydrolysis to be adsorbed on carbon microspheres formed by hydrothermal carbonization; after further condensation polymerization, oxidation, polymerization and other reactions, the formation of pseudo lignin can be promoted; the pseudo lignin can play a role in binding in the solid fuel forming process, so that the forming performance of the fuel is improved.
3. In the process of the Span80 combined hydrothermal reaction, the Span80 enables macromolecular organic matters such as heavy oil and the like existing in a liquid phase to be adsorbed on hydrothermal carbon formed by the hydrothermal reaction, so that the carbonization yield of the solid fuel is improved, and the heat value of the solid fuel is increased; in addition, macromolecular organic matters adsorbed on the hydrothermal carbon are combined together through condensation polymerization and oxidation reaction, so that the particle stacking density of the solid fuel is improved, and the quality of the solid fuel is improved.
4. The invention adopts hydrochloric acid combined with hydrothermal to carry out acidolysis reaction on the sludge and the straws, thereby not only promoting the generation of protein, polysaccharide, cellulose, lignin, micromolecule glucose, fructose, amino acid and the like, reducing the content of sludge bound water, but also promoting the dehydrogenation reaction of subsequent products to form more H 2 Inhibition of decarboxylation to produce less CO 2 Thereby increasing the carbon content of the solid fuel.
Detailed Description
The present invention will be further described below.
The preparation method of the environment-friendly sludge solidified fuel comprises the following steps:
cutting naturally air-dried straws into the length of 20-30 mm, placing the straws in a drying oven at 105 ℃ for heating and drying to constant weight, then putting the completely dried straws into a high-speed pulverizer for grinding, and after grinding, using a 60-mesh sample sieve to obtain a sample with the particle size of less than 0.3 mm.
And step two, adding the municipal sludge, the hydrochloric acid and the sample obtained in the step one into a high-pressure hydrothermal reaction kettle device, and carrying out hydrothermal reaction for 30min under the conditions that the hydrothermal temperature is 80-100 ℃ and the stirring speed is 300 rpm.
And step three, opening the high-pressure hydrothermal reaction kettle device, adding calcium carbonate particles into the device, and carrying out hydrothermal reaction for 60min under the conditions that the hydrothermal temperature is 140-150 ℃ and the stirring speed is 300 rpm.
Opening the high-pressure hydrothermal reaction kettle device, adding a Span80 (Sorbitan oleate) solution into the device, and removing air in the high-pressure kettle by adopting high-purity nitrogen; and then carrying out hydrothermal reaction for 60min under the conditions that the hydrothermal temperature is 180-210 ℃ and the stirring speed is 300 rpm. The Span80 solution was specifically a dispersion of Span80 in hot water.
And step five, naturally cooling the high-pressure hydrothermal reaction kettle device to below 85 ℃ in the air, carrying out solid-liquid separation on the mixture in the high-pressure hydrothermal reaction kettle device, then shaping the solid product obtained by separation, and drying the solid product at 105 ℃ to obtain the environment-friendly sludge solidified fuel.
Specific examples are provided for the above preparation method as follows:
example 1
On the basis of the preparation method of the environment-friendly sludge solidified fuel, the hydrothermal temperature in the fourth step is 180 ℃.
The relative parts by weight of the raw materials in each step are as follows: 30 parts of municipal sludge, 39 parts of straw, 18 parts of hydrochloric acid, 5 parts of calcium carbonate and 8 parts of Span80 solution. Wherein the water content of the municipal sludge is 80%, the mass fraction of the hydrochloric acid is 23%, and the mass fraction of the Span80 solution is 2.5%.
The fuel obtained in the example was tested for calorific value and particle density, and the specific indices are detailed in table 1.
Example 2
On the basis of the preparation method of the environment-friendly sludge solidified fuel, the hydrothermal temperature in the fourth step is 200 ℃.
The relative parts by weight of the raw materials in each step are as follows: 30 parts of municipal sludge, 39 parts of straw, 18 parts of hydrochloric acid, 5 parts of calcium carbonate and 8 parts of Span80 solution. Wherein the water content of the municipal sludge is 80%, the mass fraction of the hydrochloric acid is 23%, and the mass fraction of the Span80 solution is 2.5%.
The fuel obtained in the example was tested for calorific value and particle density, and the specific indices are detailed in table 1.
Example 3
On the basis of the preparation method of the environment-friendly sludge solidified fuel, the hydrothermal temperature in the fourth step is 210 ℃.
The relative parts by weight of the raw materials in each step are as follows: 30 parts of municipal sludge, 39 parts of straw, 18 parts of hydrochloric acid, 5 parts of calcium carbonate and 8 parts of Span80 solution. Wherein the water content of the municipal sludge is 80%, the mass fraction of the hydrochloric acid is 23%, and the mass fraction of the Span80 solution is 2.5%.
The fuel obtained in the embodiment is subjected to detection of the calorific value and the particle density, and the obtained specific indexes are detailed in table 1.
Example 4
On the basis of the preparation method of the environment-friendly sludge solidified fuel, hydrochloric acid is not added in the first step, and the hydrothermal temperature in the fourth step is 210 ℃.
The relative parts by weight of the raw materials in each step are as follows: 30 parts of municipal sludge, 39 parts of straw, 5 parts of calcium carbonate and 8 parts of Span80 solution. Wherein the water content of the municipal sludge is 80%, the mass fraction of the hydrochloric acid is 23%, and the mass fraction of the Span80 solution is 2.5%.
The fuel obtained in the example was tested for calorific value and particle density, and the specific indices are detailed in table 1.
Example 5
On the basis of the preparation method of the environment-friendly sludge solidified fuel, a Span80 solution is not added in the fourth step, and the hydrothermal temperature in the fourth step is 210 ℃.
The relative parts by weight of the raw materials in each step are as follows: 30 parts of municipal sludge, 39 parts of straw, 18 parts of hydrochloric acid and 5 parts of calcium carbonate. Wherein the water content of the municipal sludge is 80%, the mass fraction of the hydrochloric acid is 23%, and the mass fraction of the Span80 solution is 2.5%.
The fuel obtained in the example was tested for calorific value and particle density, and the specific indices are detailed in table 1.
TABLE 1 Geopolymer Strength testing
The experimental data in table 1 are combined to obtain that the solid fuel with high density and high heat value can be obtained after the sludge and biomass materials are subjected to a series of hydrothermal treatments by adopting the preparation method of the environment-friendly sludge solidified fuel, and the solid fuel can be used for replacing fuels such as coal and the like, so that the problem of recycling and harmless treatment of the sludge is solved. In addition, as can be seen from the experimental data of examples 4 and 5, the quality of the solid fuel can be remarkably improved by using hydrochloric acid for acidolysis in the step one and adding Span80 before hydrothermal carbonization in the step four.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above-mentioned embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may be made by those skilled in the art without departing from the principle of the invention.
Claims (10)
1. A preparation method of an environment-friendly sludge solidified fuel is characterized by comprising the following steps: the method comprises the following steps:
step one, mixing straw particles, municipal sludge and hydrochloric acid, and then carrying out hydrothermal reaction at the temperature of 80-100 ℃;
secondly, adding calcium carbonate particles into the hydrothermal reaction product obtained in the first step, and carrying out hydrothermal reaction at the temperature of 140-150 ℃;
step three, adding a sorbitan oleate solution into the hydrothermal reaction product obtained in the step two, and carrying out hydrothermal reaction at the temperature of 180-210 ℃ in a nitrogen atmosphere;
step four, carrying out solid-liquid separation on the hydrothermal reaction product obtained in the step three; and drying the obtained solid-phase product to obtain the environment-friendly sludge solidified fuel.
2. The method for preparing the environment-friendly sludge solidified fuel as claimed in claim 1, wherein: the preparation process of the straw particles is as follows: cutting the straws into straw sections with the length of 20-30 mm, and drying the straw sections to constant weight; and then grinding the straw sections by a high-speed grinder, and after grinding is finished, obtaining straw particles with the particle size of less than 0.3mm by using a 20-60-mesh sample sieve.
3. The method for preparing the environment-friendly sludge solidified fuel as claimed in claim 1, wherein: in the first step, the hydrothermal reaction is carried out for 30min under the condition of stirring speed of 300 rpm.
4. The method for preparing the environment-friendly sludge solidified fuel as claimed in claim 1, wherein: in the second step, the hydrothermal reaction was carried out for 60min at a stirring speed of 300 rpm.
5. The method for preparing the environment-friendly sludge solidified fuel as claimed in claim 1, wherein: in the third step, the hydrothermal reaction is carried out for 60min under the condition of stirring speed of 300 rpm.
6. The method for preparing the environment-friendly sludge solidified fuel as claimed in claim 1, wherein: the mass ratio of municipal sludge, straw, hydrochloric acid, calcium carbonate and sorbitan oleate added in each step is (28-32): (35-40): (15-20): 4-8): 5-10).
7. The method for preparing the environment-friendly sludge solidified fuel as claimed in claim 1, wherein: the water content of the municipal sludge is 80%.
8. The method for preparing the environment-friendly sludge solidified fuel as claimed in claim 1, wherein: the mass fraction of the hydrochloric acid is 20-25%.
9. The method for preparing the environment-friendly sludge solidified fuel as claimed in claim 1, wherein: the mass fraction of the sorbitan oleate solution is 2.5%.
10. An environment-friendly sludge solidified fuel is characterized in that: the composite material is obtained by mixing straw particles and municipal sludge, and then sequentially carrying out acidolysis, mesophase generation, carbonization and molding; acidolysis, intermediate phase generation and carbonization are all realized through hydrothermal reaction; adding hydrochloric acid during acidolysis; adding calcium carbonate in the intermediate phase generation; adding sorbitan oleate solution during carbonization.
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