CN115449407B - Environment-friendly nano hydrocarbon fuel and preparation method thereof - Google Patents
Environment-friendly nano hydrocarbon fuel and preparation method thereof Download PDFInfo
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- 239000000446 fuel Substances 0.000 title claims abstract description 135
- 239000004215 Carbon black (E152) Substances 0.000 title claims abstract description 102
- 229930195733 hydrocarbon Natural products 0.000 title claims abstract description 99
- 150000002430 hydrocarbons Chemical class 0.000 title claims abstract description 99
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000003245 coal Substances 0.000 claims abstract description 200
- 239000001257 hydrogen Substances 0.000 claims abstract description 107
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 107
- 239000000843 powder Substances 0.000 claims abstract description 80
- 239000002002 slurry Substances 0.000 claims abstract description 52
- 239000002245 particle Substances 0.000 claims abstract description 31
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000009826 distribution Methods 0.000 claims abstract description 10
- 239000007788 liquid Substances 0.000 claims abstract description 8
- 239000002105 nanoparticle Substances 0.000 claims abstract description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 101
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 48
- 239000002994 raw material Substances 0.000 claims description 44
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 29
- 238000000034 method Methods 0.000 claims description 29
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 27
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 25
- 229910052799 carbon Inorganic materials 0.000 claims description 25
- 239000012752 auxiliary agent Substances 0.000 claims description 24
- 239000000377 silicon dioxide Substances 0.000 claims description 24
- 239000012071 phase Substances 0.000 claims description 23
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 22
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 22
- 239000000292 calcium oxide Substances 0.000 claims description 22
- 239000007790 solid phase Substances 0.000 claims description 21
- 239000007787 solid Substances 0.000 claims description 19
- 239000007791 liquid phase Substances 0.000 claims description 18
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 claims description 17
- 238000010298 pulverizing process Methods 0.000 claims description 17
- 239000007789 gas Substances 0.000 claims description 16
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 16
- 239000003250 coal slurry Substances 0.000 claims description 13
- 229920005610 lignin Polymers 0.000 claims description 12
- GCLGEJMYGQKIIW-UHFFFAOYSA-H sodium hexametaphosphate Chemical compound [Na]OP1(=O)OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])OP(=O)(O[Na])O1 GCLGEJMYGQKIIW-UHFFFAOYSA-H 0.000 claims description 12
- 235000019982 sodium hexametaphosphate Nutrition 0.000 claims description 12
- 239000001577 tetrasodium phosphonato phosphate Substances 0.000 claims description 12
- 150000002431 hydrogen Chemical class 0.000 claims description 11
- 230000001804 emulsifying effect Effects 0.000 claims description 10
- 238000002156 mixing Methods 0.000 claims description 9
- 239000002817 coal dust Substances 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 238000007709 nanocrystallization Methods 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 25
- 230000000694 effects Effects 0.000 abstract description 20
- 230000008901 benefit Effects 0.000 abstract description 9
- 125000004435 hydrogen atom Chemical class [H]* 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 11
- 239000000654 additive Substances 0.000 description 9
- 238000004090 dissolution Methods 0.000 description 9
- 238000013112 stability test Methods 0.000 description 9
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 8
- 230000000996 additive effect Effects 0.000 description 7
- 239000002910 solid waste Substances 0.000 description 7
- 239000002253 acid Substances 0.000 description 6
- 239000002956 ash Substances 0.000 description 6
- 238000003756 stirring Methods 0.000 description 6
- 239000010881 fly ash Substances 0.000 description 5
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- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000011978 dissolution method Methods 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 239000000725 suspension Substances 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
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- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 238000005065 mining Methods 0.000 description 3
- 231100000719 pollutant Toxicity 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 239000000779 smoke Substances 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 125000004429 atom Chemical group 0.000 description 2
- 229910001570 bauxite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000010883 coal ash Substances 0.000 description 2
- 239000002864 coal component Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000000605 extraction Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
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- 239000012535 impurity Substances 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
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- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
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- 229910021392 nanocarbon Inorganic materials 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
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- 238000004626 scanning electron microscopy Methods 0.000 description 1
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Classifications
-
- 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
- C10L1/00—Liquid carbonaceous fuels
- C10L1/02—Liquid carbonaceous fuels essentially based on components consisting of carbon, hydrogen, and oxygen only
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The application provides an environment-friendly nano hydrocarbon fuel and a preparation method thereof. The nano hydrocarbon fuel is a liquid fuel containing water, powder and additional hydrogen, wherein the powder contains coal gangue and high-quality coal, the weight ratio of the coal gangue to the high-quality coal is 1:2-1:3, the particle size distribution of the powder is D50 of 1.6-3.0 mu m, D90 of 5-20 mu m and D97 of less than or equal to 42 mu m. The adopted nano hydrocarbon fuel has the advantages of micro-nano particle size, high surface activity, sufficient combustion after entering a boiler, high combustion efficiency and high burnout rate, and has higher heat value under the same working condition compared with the traditional coal water slurry.
Description
Technical Field
The invention relates to the field of environment-friendly fuels, in particular to an environment-friendly nano hydrocarbon fuel and a preparation method thereof.
Background
At present, the consumption proportion of coal energy in China is about 60%, a large amount of gangue is produced in the process of mining, washing and selecting by coal mine enterprises, and the gangue is piled up to about 40 hundred million tons. The generation and the stockpiling of the gangue bring a great deal of problems of environmental pollution, potential safety hazard and the like.
Because gangue or inferior coal contains more nonflammable mineral impurities, the characteristics of low heat value, huge yield and the like, the utilization of solid wastes is not greatly progressed all around the field.
The content of alumina in the gangue ash in the inner Mongolian quaiger mining area is very high, usually about 40% -50%, which is close to the content of Al 2O3 in the middle-grade bauxite in China, and is a valuable regenerated aluminum-containing mineral resource. The quasi-energy group company develops a core process technology for extracting aluminum oxide from aluminum silicon powder by a one-step acid dissolution method for 15 years, and has industrialized implementation conditions.
The method takes the coal gangue and other inferior coals as raw materials, and from the two aspects of environmental protection and economic benefit, the clean fuel with relatively excellent performance is prepared, the requirements of user combustion equipment on coal quality are met, and the problems of large solid waste environmental pollution and the like are solved. Meanwhile, on the basis of keeping the resource characteristics of coal fuel, the raw material resource characteristics of coal are fully developed, alumina is produced by using high-alumina fly ash, the coal is pushed to be converted from single fuel to fuel and raw material, the high-value utilization of coal gangue is realized, the dilemma of bauxite resource shortage in China is relieved, and the method has great practical significance and long-term strategic significance.
Disclosure of Invention
The invention mainly aims to provide an environment-friendly nano hydrocarbon fuel and a preparation method thereof, so as to solve the problem of low added value of fuel in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided an environment-friendly nano hydrocarbon fuel, which is a liquid fuel containing water, a powder and additional hydrogen, wherein the powder comprises coal gangue and high-quality coal, the weight ratio of the coal gangue to the high-quality coal is 1:2-1:3, the particle size distribution of the powder is D50 of 1.6-3.0 μm, D90 of 5-20 μm, and D97 is not more than 42 μm.
Further, the coal gangue contains 10-12% of carbon, 30-40% of alumina, 30-35% of silica, 0.05-0.15% of calcium oxide and 1.0-2.5% of ferric oxide in percentage by weight; and/or the carbon content in the high-quality coal is 63% -75%, the alumina content is 11% -15%, the silica content is 6% -10%, the calcium oxide content is 0.5% -2.0%, and the ferric oxide content is 1.0% -2.0%;
preferably, the carbon content in the high-quality coal is 70% -75%, the alumina content is 13% -15%, the silica content is 8% -10%, the calcium oxide content is 1.5% -2.0%, and the ferric oxide content is 1.0% -2.0%;
preferably, the particle size distribution of the powder is D50 of 1.6-2.0 μm, D90 of 5-15 μm and D97 of less than or equal to 30 μm.
Further, the content of the powdery material is 65 to 68wt%, preferably, the ash content of the high-quality coal is not more than 30wt%, more preferably, the calorific value of the high-quality coal is 5500 to 7000 kilocalories.
Further, the nano hydrocarbon fuel is placed in a closed container, and the additional hydrogen comprises solid phase hydrogen, free liquid phase hydrogen and free gas phase hydrogen, preferably, the solid phase hydrogen is 1.1-1.3 times of the hydrogen content in the powder, and further preferably, the solid phase hydrogen is 1.2-1.3 times of the hydrogen content in the powder; preferably, the content of free liquid phase hydrogen is 400 to 800ppm; preferably, the content of free gas phase hydrogen in the gas phase component of the nano hydrocarbon fuel is 600-1000 ppm.
According to another aspect of the present application, there is provided a method for preparing an environment-friendly nano hydrocarbon fuel, the method comprising the steps of: step S1, mixing gangue with high-quality coal according to a weight ratio of 1:2-1:3 to obtain raw material coal; s2, pre-crushing raw material coal to obtain pre-crushed coal powder, wherein the median granularity of the pre-crushed coal powder is 40-80 meshes; s3, mixing the pre-crushed coal powder with water, and performing nanocrystallization crushing to obtain a nano coal powder slurry, wherein D50 of the nano coal powder is 1.6-3.0 mu m, D90 of the nano coal powder is 5-20 mu m, and D97 of the nano coal powder is 30-42 mu m; and S4, carrying out hydrogen attaching treatment on the nano coal powder slurry to obtain the environment-friendly nano hydrocarbon fuel.
Further, the coal gangue contains 10-12% of carbon, 30-40% of alumina, 30-35% of silica, 0.05-0.15% of calcium oxide and 1.0-2.5% of ferric oxide in percentage by weight; and/or the carbon content in the high-quality coal is 63% -75%, the alumina content is 11% -15%, the silica content is 6% -10%, the calcium oxide content is 0.5% -2.0%, and the ferric oxide content is 1.0% -2.0%;
Preferably, the carbon content in the high-quality coal is 70% -75%, the alumina content is 13% -15%, the silica content is 8% -10%, the calcium oxide content is 1.5% -2.0%, and the ferric oxide content is 1.0% -2.0.
Further, the part of the pre-crushed coal powder is less than or equal to 15 percent of the part with 150 meshes by weight, and/or the part of the pre-crushed coal powder is more than or equal to 15 percent of the part with 30 meshes by weight;
Preferably, the part of the pre-crushed coal powder is smaller than 150 meshes and smaller than or equal to 10 percent, and/or the part of the pre-crushed coal powder is larger than 30 meshes and smaller than or equal to 10 percent, and/or the passing rate of the pre-crushed coal powder is between 5 and 20 meshes and is 100 percent;
further preferably, step S2 includes coarse pulverizing raw coal to obtain coarse pulverized coal having a particle diameter of 1 to 3mm by a first stage coarse pulverizing, and fine pulverizing the coarse pulverized coal to obtain pre-pulverized coal by a second stage fine pulverizing.
Further, D50 of the nanometer coal powder is 1.6-2.0 mu m, D90 is 5-15 mu m, and D97 is less than or equal to 30 mu m; preferably, the solid content of the nano coal powder slurry is 65-68%.
Further, step S3 includes: step S31, mixing the pre-pulverized coal and water, performing nano-pulverization to obtain nano-pulverized coal pulverized slurry, step S32, adding an auxiliary agent into the nano-pulverized coal pulverized slurry to obtain nano-pulverized coal slurry,
Preferably, the auxiliary agent is added into the nano coal powder slurry in an emulsifying shearing mode, more preferably, the rotating speed of an emulsifying shearing machine is 2800-3000 r/s, the emulsifying time is 25-30 minutes, and even more preferably, the auxiliary agent is added into the nano coal powder slurry for multiple times.
Preferably, the auxiliary agent comprises any one or more of lignin, sodium hexametaphosphate and sulfonate,
More preferably, the addition amount of sodium hexametaphosphate is 3 to 6 per mill based on the dry weight of the solid in the nano coal powder slurry, and/or the addition amount of lignin is 0.7 to 1.1 per mill, and/or the addition amount of sulfonate is 1.3 to 2.2 per mill.
Further, in the step S4, hydrogen is introduced into the nano pulverized coal slurry to perform hydrogen-attaching treatment, preferably, the amount of hydrogen introduced into the nano pulverized coal slurry formed by each ton of raw material coal is 2.0-6.0 m 3.
By applying the technical scheme of the application, the adopted nano hydrocarbon fuel has the advantages of micro-nano particle size, high surface activity, sufficient combustion after entering a boiler, high combustion efficiency and high burnout rate, and has higher heat value under the same working condition compared with the traditional coal water slurry. Meanwhile, by compounding the gangue with the high-quality coal, the cost of raw material coal is saved, the problem of massive solid waste pollution of the gangue is solved, the emission amount of bottom slag is low, SO 2、NOx and smoke emission are greatly reduced, the power generation energy consumption is reduced, and the pollutant emission is reduced. The nano hydrocarbon fuel has the advantages of improved activity of aluminum silicon powder after combustion, high dissolution rate, high-quality raw materials in the subsequent step of extracting aluminum oxide by a one-step acid dissolution method, and realization of upgrading of the dual value of coal gangue from bulk solid waste to fuel and raw materials.
Drawings
The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:
FIG. 1 is a schematic diagram showing the results of the particle size test of the hydrocarbon nanofuel finished product of example 1 of the present invention;
FIG. 2 shows the microscopic morphology of the hydrocarbon nanofuel baking powder part of example 1 of the present invention under a 1 μm scale of Scanning Electron Microscope (SEM) analysis;
fig. 3 shows the microscopic morphology of the hydrocarbon nanofuel baking powder part of example 1 of the present invention under a10 μm scale of Scanning Electron Microscope (SEM) analysis.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
As analyzed by the background technology of the application, the prior art cannot fully utilize the coal gangue which exists in a large amount because of the fact that the coal gangue contains more nonflammable mineral impurities and has low heat value, and in order to solve the problem, the application provides an environment-friendly nano hydrocarbon fuel and a preparation method thereof.
According to an exemplary embodiment of the application, an environment-friendly nano hydrocarbon fuel is provided, which is a liquid fuel containing water, powder and hydrogen, wherein the powder comprises coal gangue and high-quality coal, the weight ratio of the coal gangue to the high-quality coal is 1:2-1:3, the particle size distribution of the powder is D50 of 1.6-3.0 mu m, D90 of 5-20 mu m and D97 of less than or equal to 42 mu m.
The nano hydrocarbon fuel has the advantages of micro-nano particle size, high surface activity, sufficient combustion after entering a boiler, high combustion efficiency and high burnout rate, and has higher heat value under the same working condition compared with the traditional coal water slurry. Meanwhile, by compounding the gangue with the high-quality coal, the cost of raw material coal is saved, the problem of massive solid waste pollution of the gangue is solved, the emission amount of bottom slag is low, SO 2、NOx and smoke emission are greatly reduced, the power generation energy consumption is reduced, and the pollutant emission is reduced. The nano hydrocarbon fuel has the advantages of improved activity of aluminum silicon powder after combustion, high dissolution rate, high-quality raw materials in the subsequent step of extracting aluminum oxide by a one-step acid dissolution method, and realization of upgrading of the dual value of coal gangue from bulk solid waste to fuel and raw materials.
The raw material coal components (such as carbon content, al 2O3, siO 2 and the like) including coal gangue and high-quality coal can influence the heat value, fluidity, viscosity and other performances of the fuel, and researchers of the application find that the surface activity and surface energy of particles are obviously enhanced under the micro-nano state of the powder, and the raw material coal components (such as carbon content, or the contents of silica, alumina, calcium oxide, ferric oxide and the like of main ash components are also obviously different, so that the surface activity and surface energy of slurry are also obviously different, and the applicable technological parameters and additive selection of the prepared nano hydrocarbon fuel are influenced, thereby influencing the concentration and granularity of the finished nano hydrocarbon fuel. In some embodiments of the present application, in order to further improve the performance of the nano hydrocarbon fuel, the carbon content in the coal gangue is 10% -12%, the alumina content is 30% -40%, the silica content is 30% -35%, the calcium oxide content is 0.05% -0.15%, the iron oxide content is 1.0% -2.5%, and the influence of other components except the above compounds in the raw material coal including the coal gangue and the high-quality coal on the nano hydrocarbon fuel is small, and no content requirement exists.
The high-quality coal refers to coal having a relatively high carbon content, for example, coal having a carbon content of 60% or more. In some embodiments, in order to further improve the performance of the nano hydrocarbon fuel, the high-quality coal has a carbon content of 63% -75%, an alumina content of 11% -15%, a silica content of 6% -10%, a calcium oxide content of 0.5% -2.0% and an iron oxide content of 1.0% -2.0%, and the high-quality coal with the composition has a wide source and is helpful for improving the combustion performance of the hydrocarbon fuel. In some preferred embodiments, the high-quality coal has a carbon content of 70% -75%, an alumina content of 13% -15%, a silica content of 8% -10%, a calcium oxide content of 1.5% -2.0%, an iron oxide content of 1.0% -2.0%, and better combustion performance.
In some embodiments, in order to further improve the performance of the nano hydrocarbon fuel, the particle size distribution of the powder is D50 of 1.6-2.0 μm, D90 of 5-15 μm, and D97 of less than or equal to 30 μm, the nano hydrocarbon fuel with the particle size distribution has good combustion performance, and the activity of aluminum silicon powder in the generated fly ash after combustion is higher, especially when alumina is extracted by a "one-step acid dissolution method" of a quasi-energy group company, the dissolution rate of the aluminum silicon powder is further improved, even if compared with the extracted aluminum silicon powder after homogeneous coal combustion, the dissolution rate of the aluminum silicon powder of the nano hydrocarbon fuel with the particle size distribution is significantly improved.
In some embodiments, the ash content of the high-quality coal is less than or equal to 30wt%, and preferably, the heat value of the high-quality coal is 5500-7000 kilocalories, which is beneficial to further improving the heat value of the nano hydrocarbon fuel and improving the burnout rate thereof.
The solid content of the nano hydrocarbon fuel can be determined by combining the slurry concentration and the use requirement of the powder, and the stable suspension with higher solid content can be formed due to the composition and the particle size characteristics of the nano hydrocarbon fuel. In some embodiments of the application, the powder is present in an amount of 65wt% to 68wt%, preferably 66.5wt% to 68wt%.
The above-mentioned additional hydrogen is a hydrogen element that can be burned in addition to the hydrogen element contained in the raw material coal, which is added to the liquid fuel in order to increase the fuel combustion performance and the heat value, and the manner of adding the additional hydrogen and the state of the hydrogen in the fuel are not limited. The micro-nano pulverized coal has extremely small particle size and large specific surface area and surface energy, so that the micro-nano pulverized coal has a plurality of special physical and chemical properties, and a large number of active atoms exist on the surface of pulverized coal particles, so that various atoms or molecules are easily adsorbed, a large amount of hydrogen can be adsorbed, and the heat value of fuel is greatly improved. In some embodiments of the present application, the nano-hydrocarbon fuel is placed in a closed container and the additional hydrogen includes solid phase hydrogen, free liquid phase hydrogen, and free gas phase hydrogen. The solid-phase hydrogen refers to hydrogen solidified on the surface of nano-scale pulverized coal powder, and occupies most of the attached hydrogen, the free liquid-phase hydrogen exists in nano-hydrocarbon fuel liquid in a free-state hydrogen molecular form, and the other part of free gas-phase hydrogen exists in a space which is not filled with fuel slurry in a closed container for containing nano-hydrocarbon fuel. When the nano hydrocarbon fuel is combusted, the nano hydrocarbon fuel is generally conveyed through a closed pipeline, is sprayed into a combustion furnace after being mechanically atomized, and gas phase, liquid phase and solid phase hydrogen in the nano hydrocarbon fuel are combusted together, so that the heat value of the fuel can be increased, and the coal dust in the fuel can be fully combusted, so that the overall heat value of the fuel is further improved. In some embodiments, the solid phase hydrogen is 1.1-1.3 times of the hydrogen content in the powder, and more preferably, the solid phase hydrogen is 1.2-1.3 times of the hydrogen content in the powder, so that the heat value of the nano hydrocarbon fuel can be further improved.
In some embodiments, the free liquid phase hydrogen is present in an amount of 400 to 800ppm, i.e., 400 to 800 milligrams of free liquid phase hydrogen per kilogram of liquid portion of the nanocarbon hydrogen fuel.
In some embodiments, the amount of free gas phase hydrogen in the nano hydrocarbon fuel gas phase component is 600 to 1000ppm, i.e., 600 to 1000mL of free gas phase hydrogen per cubic gas phase component. It is further preferable that the content of free gas phase hydrogen is 800 to 1000ppm.
According to another exemplary embodiment of the present application, there is provided a method for preparing an environment-friendly nano hydrocarbon fuel, which comprises the steps of: step S1, mixing gangue with high-quality coal according to a weight ratio of 1:2-1:3 to obtain raw material coal; step S2, pre-crushing raw material coal to obtain pre-crushed coal dust; s3, mixing the pre-crushed coal powder with water, and performing nanocrystallization crushing to obtain nano coal powder slurry, wherein D50 of the nano coal powder is 1.6-3.0 mu m; and S4, carrying out hydrogen attaching treatment on the nano coal powder slurry to obtain the environment-friendly nano hydrocarbon fuel.
The nano hydrocarbon fuel prepared by the method has the advantages of micro-nano particle size, high surface activity, sufficient combustion after entering a boiler, high combustion efficiency and high burnout rate, and has higher heat value under the same working condition compared with the traditional coal water slurry.
The high-quality coal and the gangue in the preparation method can be selected in the prior art, and in some embodiments of the application, the carbon content in the gangue is 10-12% by weight, the alumina content is 30-40% by weight, the silica content is 30-35% by weight, the calcium oxide content is 0.05-0.15% by weight, and the ferric oxide content is 1.0-2.5% by weight; the high-quality coal contains 63% -75% of carbon, 11% -15% of alumina, 6% -10% of silicon dioxide, 0.5% -2.0% of calcium oxide and 1.0% -2.0% of ferric oxide; preferably, the carbon content in the high-quality coal is 70% -75%, the alumina content is 13% -15%, the silica content is 8% -10%, the calcium oxide content is 1.5% -2.0%, and the ferric oxide content is 1.0% -2.0.
The step S2 is to pre-pulverize the raw material coal, so as to obtain a more suitable particle size distribution of the raw material, so as to facilitate the subsequent nano-pulverizing process, in some embodiments of the present application, the median particle size of the pre-pulverized coal is 40-80 mesh, the pre-pulverized coal is less than 150 mesh and less than or equal to 15% by weight, and/or the pre-pulverized coal is greater than 30 mesh and less than or equal to 15% by weight, so that the particle size is more uniform, and the efficiency of the subsequent nano-pulverizing is improved. In some preferred embodiments, to further increase the pulverizing efficiency, the pre-pulverized coal is less than 150 mesh fraction 10% by weight, and/or the pre-pulverized coal is greater than 30 mesh fraction 10% by weight. In some embodiments, the passing rate of the pre-pulverized coal is 100% in 5-20 meshes, namely the particle size of the pulverized coal is within 5-20 meshes through pre-pulverization treatment, so that the method is more beneficial to obtaining higher productivity and better pulverization effect through nano pulverization.
The pre-crushing process may be performed according to the prior art, the present application is not limited, and in some embodiments of the present application, the pre-crushing process in step S2 includes coarse crushing raw coal to obtain coarse crushed coal powder with a particle diameter of 1-3 mm, and fine crushing the coarse crushed coal powder to obtain pre-crushed coal powder.
The above-mentioned nano pulverizing method can be selected from the prior art, and can be used for obtaining the above-mentioned grain size range, in some preferred embodiments, D50 of nano pulverized coal is 1.6-2.0 micrometers, D90 is 5-15 micrometers, D97 is less than or equal to 30 micrometers, and the grain size of nano pulverized coal is finer, so that it is favorable for further raising content and stability of additional hydrogen.
In some embodiments of the present application, in the step S3, a proper amount of water is added to make the solid content of the nano pulverized coal slurry 65% -68%, and by using the preparation method of the present application, the nano hydrocarbon fuel with the solid content can maintain good suspension stability and has a high heat value.
In some embodiments of the present application, the step S3 includes: step S31, mixing the pre-pulverized coal and water, performing nano-pulverization to obtain nano-pulverized coal pulverized slurry, and step S32, adding an auxiliary agent into the nano-pulverized coal pulverized slurry to obtain nano-pulverized coal slurry. The auxiliary agent has the main functions of changing the fluidity, preventing the agglomeration of the nano coal powder and promoting the stable suspension of the nano coal powder slurry. The addition mode of the auxiliary agent can refer to the prior art, for example, the additive is added into the nano coal powder slurry in an emulsifying shearing mode. In some embodiments of the application, the emulsifying shears rotate at 2800-3000 rpm for a period of 25-30 minutes. In some preferred embodiments, the adjunct is added to the pulverized nano-coal slurry in multiple portions. In some embodiments, the slurry is pre-dispersed by shearing and emulsifying for 5 minutes before adding the auxiliary agent, and then 30-40% of the total amount of the required additive is added; stirring for 5-10 min, and adding 30-40% of the total amount of the required additives again; after stirring for 5-10 min, adding all the rest additives, and stirring for 10-15 min.
The specific types of the auxiliary agents can be selected from substances with the dispersing effect in the prior art, in some embodiments of the application, the auxiliary agents comprise any one or more of lignin, sodium hexametaphosphate and sulfonate, the dispersibility of the auxiliary agents on the nano coal dust slurry is good, and the time of layering or precipitation of the nano hydrocarbon fuel can be further delayed after the auxiliary agents are added, wherein the sulfonate can be common sulfonate such as sodium sulfonate and potassium sulfonate. Preferably, the dry weight of the solid in the nano coal powder slurry is taken as a reference, the addition amount of sodium hexametaphosphate is 3 to 6 per mill, and/or the addition amount of lignin is 0.7 to 1.1 per mill, and/or the addition amount of sulfonate is 1.3 to 2.2 per mill, so that the nano coal powder slurry has a good dispersing effect on coal powder, has good fluidity, and can further delay the time of layering or precipitation of fuel. More preferably, the additive is compounded by lignin, sodium hexametaphosphate and sulfonate, and based on the dry weight of the solid, the additive amount of sodium hexametaphosphate is 4.5-6 per mill, the additive amount of lignin is 0.7-0.9 per mill, and the additive amount of sulfonate is 1.3-1.7 per mill, so that the solid has better fluidity, more proper apparent viscosity and better stability. According to the application, researchers find that when materials are in a micro-nano state, many physical characteristics and chemical characteristics are fundamentally different from those of the materials in a conventional state, the particle size of a finished product of the nano hydrocarbon fuel is micro-nano, and as the specific surface area of ultrafine particles is large, the influence of electronic effect, hydroxyl effect, van der Waals force and the like on the particles is increased in geometric coefficient, the particles are promoted to be attracted and extruded with each other, namely, agglomeration phenomenon occurs, the particles are mainly represented as further increase of viscosity in fluid, and the effect of gravity on the fluid is very little at the moment, so that the nano hydrocarbon fuel has high viscosity and excellent suspension stability.
In the step 4, the specific process of carrying out the hydrogen attaching treatment on the nano pulverized coal slurry may refer to the prior art, for example, a mode of introducing hydrogen into the nano pulverized coal slurry, and a specific operation method refers to the prior art, which is not described herein. In some embodiments of the application, the amount of hydrogen introduced into the nano coal powder slurry formed by each ton of raw material coal is 2.0-6.0 m 3.
The advantageous effects that can be achieved by the present application will be further described below with reference to examples and comparative examples.
Example 1
(1) Preparing raw material coal
And determining to select coal in the quasiell region of the inner Mongolia quasimon group company as a raw material coal type, wherein the mass ratio of the gangue to the high-quality coal is 1:2.
The coal gangue contains 11% of carbon, 38% of alumina, 33% of silicon dioxide, 0.1% of calcium oxide and 1.5% of ferric oxide.
The high-quality coal is refined coal in a quaighur mining area, the heat value is 6500 kilocalories, the ash content is 25wt%, and the specific components are as follows: the carbon content is 72%, the alumina content is 14%, the silica content is 9%, the calcium oxide content is 1.7% and the ferric oxide content is 1.5%.
(2) Pre-crushing
The pre-crushing is divided into coarse crushing and fine crushing, wherein the coarse crushing is to crush raw coal with the diameter of 10-30 mm to 1-3 mm by using a csj-250 type crusher to obtain coarse crushing coal powder; and then feeding the coarse pulverized coal into a WN-20 pulverizer for fine pulverization to obtain the pre-pulverized coal, wherein the median particle size of the pre-pulverized coal is 60 meshes, 8% is less than 150 meshes, 8% is greater than 30 meshes, and 100% is 15 meshes.
(3) Nanometer crushing
The pre-pulverized coal is sent into a nanometer pulverizer to prepare nanometer pulverized coal pulverized slurry with the solid content of 66 percent.
The addition agent in this example was 5% sodium hexametaphosphate, 0.8% lignin and 1.5% sodium sulfonate based on dry solids weight. The addition of the auxiliary agent comprises the following steps: firstly, the nano coal dust crushed slurry is sheared and emulsified for 5 minutes, the rotating speed of an emulsifying shearing machine is 2800 r/s, the slurry is pre-dispersed, then 35 percent of the total amount of the auxiliary agent is added, and stirring is continued for 5 minutes at the same rotating speed. 35% of the total amount of auxiliary agent was added again and stirring was continued for 8 minutes. And finally, adding all the residual auxiliary agents, and continuously stirring for 12 minutes to obtain the nano coal powder slurry.
(4) Hydrogen attached
Introducing hydrogen into the nano coal powder slurry, and introducing the hydrogen amount: the amount of introduced hydrogen is 4.5m 3 per 1 ton of dry basis based on the dry weight of nano hydrocarbon fuel solid. And (5) sub-packaging to obtain a nano hydrocarbon fuel finished product.
Finished product test
Particle size testing: the particle size of the nano coal powder was detected by using a shimadzu SALD-3101 laser particle sizer, and the test result is d50=1.8 μm (as shown in fig. 1), d90=13 μm, d97=25 μm.
The obtained nano hydrocarbon fuel was dried and scanned for its microscopic morphology by scanning electron microscopy (zeiss SUPRATM, germany) as shown in figures 2 and 3.
Hydrogen content test
Solid phase hydrogen: according to DL/T568-2013 rapid analysis method of fuel elements, a high-temperature combustion-infrared thermal conductivity combined measurement method is adopted to detect the solid-phase hydrogen content of nano hydrocarbon fuel, and meanwhile, raw coal with the same dry basis weight and composition is analyzed. The solid phase hydrogen content was 1.25 times the hydrogen content in the feed coal.
Free liquid phase hydrogen: and (3) heating the quantitatively removed nano hydrocarbon fuel finished product in a closed oil bath, and measuring the hydrogen content in the evaporated gas by adopting a gas chromatography. The content of free liquid phase hydrogen obtained by conversion was 700ppm.
Free gas phase hydrogen: and detecting the content of hydrogen in the gas in the bottle by using a direct bottle opening detection mode for the nano hydrocarbon fuel sample, and measuring the content of free gas phase hydrogen to be 950ppm.
Viscosity test: the viscosity of the slurry was measured using a Hark VT550 type rotational viscometer, measuring 780 Pa.s.
Stability test: according to the GBT18856.5-2008 water-coal-slurry stability test method, a certain amount of uniform nano hydrocarbon fuel sample is placed in a container, after the nano hydrocarbon fuel sample is placed for 7d under a specified condition, the container is inclined to enable the nano hydrocarbon fuel to flow out freely, then the container is vertically inverted for 8Min, the mass of residues in the container is weighed, and the static stability of the nano hydrocarbon fuel is represented by the mass fraction of the residues of the nano hydrocarbon fuel in the nano hydrocarbon fuel sample. The test results are: the residue of the nano hydrocarbon fuel accounts for 13% of the nano hydrocarbon fuel sample. Heat value test: according to the measurement method of the oxygen bomb calorimeter, the test result shows that compared with the raw material coal with the same weight contained in the fuel, the heat value of the nano hydrocarbon raw material of the embodiment is improved by 16%.
Combustion conditions: experiments are carried out on a 1MW horizontal cylindrical test furnace which is specially designed and built for testing the combustion characteristics of slurry fuel, liquid fuel and solid powder fuel at Zhejiang university, and the burnout rate is 96.38%.
Activity of fly ash: the coal ash obtained after the combustion of the nano hydrocarbon fuel in the embodiment is mixed with hydrochloric acid for reaction, the hydrochloric acid and alumina in the coal ash are subjected to chemical reaction, and the aluminum is leached into the slurry. The residue obtained after the extraction of alumina, i.e. the composition of the white mud sample, is shown in table 1 below,
TABLE 1
The dissolution rate calculation method is as follows:
the acid method is used for dissolving out Al 2O1/SiO2＝MHA/S in the components before dissolving out and Al 2O3/SiO2＝BNA/S in the components after dissolving out by utilizing the characteristic that SiO 2 is indissolvable in acid, and the dissolution rate can be calculated according to the following formula
As can be seen from the data in table 1, the dissolution rate was 91.45%.
The following examples and comparative examples were tested in the same manner as in example 1.
Example 2
The difference from example 1 is that: (1) The mass ratio of the gangue to the high-quality coal is 1:3, the calorific value of the high-quality coal is 5800 kilocalories, the ash content is 25wt%, and the specific components are as follows: the carbon content is 64%, the alumina content is 12.5%, the silica content is 6.8%, the calcium oxide content is 0.7% and the ferric oxide content is 1.5%; (3) The solid content of the nano coal powder slurry is 67%, the addition amount of the auxiliary agent is 4.0 per mill based on the dry weight of the solid, the addition amount of lignin is 1.0 per mill, and the addition amount of potassium sulfonate is 2.0 per mill; (4) The amount of hydrogen introduced was 3.5m 3.
The finished particle size of the obtained nano hydrocarbon fuel is d50=2.5 μm, d90=17 μm and d97=38 μm; the solid phase hydrogen content is 1.21 times of the hydrogen content in the raw material coal; the free liquid phase hydrogen content was 590ppm; free gas phase hydrogen content 840ppm; the apparent viscosity of the slurry of this example was 800mpa.s; the stability test results were: the residue of the nano hydrocarbon fuel accounts for 11% of the nano hydrocarbon fuel sample (standing for 7 days).
Compared with the raw material coal with the same weight contained in the fuel, the nano hydrocarbon fuel of the embodiment has the heat value improved by 14 percent. The burnout rate was 96.23%.
The components of the white mud sample obtained after alumina extraction from the burned fly ash are shown in table 2 below,
TABLE 2
As can be seen from the data in table 2, the fly ash dissolution rate for this example was 90.56%.
Example 3
The difference from example 1 is that: the solid content of the nano coal powder slurry is 68%.
The solid phase hydrogen content is 1.3 times of the hydrogen content in the raw materials; the free liquid phase component hydrogen content was 800ppm; the free hydrogen gas phase component contained 1000ppm hydrogen; the apparent viscosity of the slurry of this example was 800mpa.s; the stability test results were: the residue of the nano hydrocarbon fuel accounts for 12% of the nano hydrocarbon fuel sample (standing for 7 days).
Compared with the raw material coal with the same weight contained in the fuel, the nano hydrocarbon fuel of the embodiment has 17 percent of heat value improvement amplitude. The burnout rate is 95.88%.
Example 4
The difference from example 1 is that: the solid content of the nano coal powder slurry is 65%.
The solid phase hydrogen content is 1.23 times of the hydrogen content in the raw materials; the free liquid phase component hydrogen content was 600ppm; the free hydrogen gas phase component contained 850ppm hydrogen; the apparent viscosity of the slurry of this example is 760mpa.s; the stability test results were: the residue of the nano hydrocarbon fuel accounts for 14% of the nano hydrocarbon fuel sample (standing for 7 days).
Compared with the raw material coal with the same weight contained in the fuel, the nano hydrocarbon fuel of the embodiment has the heat value improved by 15 percent. The burnout rate was 95.89%.
Example 5
The difference from example 1 is that the auxiliary agent does not contain lignin, and the addition amounts of sodium hexametaphosphate and sodium sulfonate are 5.5 per mill and 1.8 per mill respectively.
The solid phase hydrogen content is 1.08 times of the hydrogen content in the raw materials; the free liquid phase component hydrogen content was 420ppm; the free hydrogen gas phase component contained 580ppm hydrogen; the apparent viscosity of the slurry of this example was at 890mpa.s; the stability test results were: the residue of the nano hydrocarbon fuel accounts for 9.5% of the nano hydrocarbon fuel sample (standing for 7 days).
Compared with the raw material coal with the same weight contained in the fuel, the nano hydrocarbon fuel of the embodiment has the heat value improved by 11 percent. The burnout rate is 95.95%.
Example 6
The difference from example 1 is that the auxiliary agent does not contain sulfonate, and the addition amounts of sodium hexametaphosphate and lignin are 6 per mill and 1.3 per mill respectively.
The solid phase hydrogen content is 1.06 times of the hydrogen content in the raw materials; the free liquid phase component hydrogen content was 390ppm; the free hydrogen gas phase component contained 540ppm hydrogen; the apparent viscosity of the slurry of this example was 920mpa.s; the stability test results were: the residue of the nano hydrocarbon fuel was 9.0% of the nano hydrocarbon fuel sample (standing for 7 days).
Compared with the raw material coal with the same weight contained in the fuel, the nano hydrocarbon fuel of the embodiment has the heat value improved by 11 percent. The burnout rate is 95.96%.
Example 7
The difference from example 1 is that the auxiliary agent is sodium hexametaphosphate only, and the addition amount is 7.3 per mill.
The solid phase hydrogen content is 1.03 times of the hydrogen content in the raw materials; the free liquid phase component hydrogen content was 380ppm; the free hydrogen gas phase component contained 492ppm hydrogen; the apparent viscosity of the slurry of this example is 1010mpa.s; the stability test results were: the residue of the nano hydrocarbon fuel accounts for 8.8% of the nano hydrocarbon fuel sample (standing for 7 days).
Compared with the raw material coal with the same weight contained in the fuel, the nano hydrocarbon fuel of the embodiment has the heat value improved by 10 percent. The burnout rate is 95.98%.
Comparative example 1
The difference from example 1 is that (4) hydrogen attachment was not performed.
Compared with the raw material coal with the same weight contained in the fuel, the obtained fuel has the heat value improved by 1.2 percent; the burnout rate is 95.32%, and the combustion process is in progress.
Comparative example 2
The difference from example 1 is that d50=10.5 μm, d90=43 μm, d97=97 μm of the nano pulverized coal.
The solid phase hydrogen content is 1.013 times of the hydrogen content in the raw materials; the free liquid phase component hydrogen content was 102ppm; the free hydrogen gas phase component contained 126ppm hydrogen; the apparent viscosity of the slurry of this example 650mpa.s; the stability test results were: the residue of the nano hydrocarbon fuel accounts for 15% of the nano hydrocarbon fuel sample (standing for 7 days).
Compared with the raw material coal with the same weight contained in the fuel, the nano hydrocarbon fuel of the embodiment has the heat value of 1.5 percent; the burnout rate was 94.77%.
From the above description, it can be seen that the above embodiments of the present application achieve the following technical effects: the nano hydrocarbon fuel has the advantages of micro-nano particle size, high surface activity, sufficient combustion after entering a boiler, high combustion efficiency and high burnout rate, and has higher heat value under the same working condition compared with the traditional coal water slurry. Meanwhile, the emission amount of bottom slag is low, SO that the emission of SO 2、NOx and smoke dust is greatly reduced, the power generation energy consumption is reduced, and the emission of pollutants is reduced. The nano hydrocarbon fuel has the advantages of improved activity of aluminum silicon powder after combustion, high dissolution rate, high quality raw materials in the subsequent aluminum oxide preparation link, and realization of upgrading of the coal gangue from bulk solid waste to fuel and raw materials.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (26)
1. An environment-friendly nano hydrocarbon fuel is a liquid fuel containing water, powder and additional hydrogen, and is characterized in that the powder comprises coal gangue and high-quality coal, the weight ratio of the coal gangue to the high-quality coal is 1:2-1:3, the particle size distribution of the powder is D50 of 1.6-3.0 mu m, D90 of 5-20 mu m and D97 of less than or equal to 42 mu m;
The nanometer hydrocarbon fuel is placed in a closed container, the additional hydrogen comprises solid-phase hydrogen, free liquid-phase hydrogen and free gas-phase hydrogen, and the solid-phase hydrogen is 1.1-1.3 times of the hydrogen content in the powder.
2. The nano hydrocarbon fuel according to claim 1, wherein the carbon content in the coal gangue is 10% -12%, the alumina content is 30% -40%, the silica content is 30% -35%, the calcium oxide content is 0.05% -0.15%, and the ferric oxide content is 1.0% -2.5% by weight; and/or the high-quality coal has 63-75% of carbon, 11-15% of alumina, 6-10% of silicon dioxide, 0.5-2.0% of calcium oxide and 1.0-2.0% of ferric oxide.
3. The nano hydrocarbon fuel according to claim 2, wherein the carbon content in the high-quality coal is 70% -75%, the alumina content is 13% -15%, the silica content is 8% -10%, the calcium oxide content is 1.5% -2.0%, and the iron oxide content is 1.0% -2.0%.
4. The nano hydrocarbon fuel according to claim 2, wherein the particle size distribution of the powder is D50 of 1.6-2.0 μm, D90 of 5-15 μm and D97 of less than or equal to 30 μm.
5. The nano hydrocarbon fuel according to claim 1, wherein the powder is 65wt% to 68wt%.
6. The nano hydrocarbon fuel according to claim 1, wherein ash content of the high quality coal is 30wt% or less.
7. The nano hydrocarbon fuel according to claim 1, wherein the high-quality coal has a calorific value of 5500 to 7000 kcal.
8. The nano hydrocarbon fuel according to claim 1, wherein the solid phase hydrogen is 1.2 to 1.3 times the hydrogen content in the powder.
9. The nano hydrocarbon fuel according to claim 1, wherein the content of the free liquid phase hydrogen is 400 to 800ppm.
10. The nano hydrocarbon fuel according to claim 1, wherein the content of free gas phase hydrogen in the gas phase component of the nano hydrocarbon fuel is 600 to 1000ppm.
11. A method for preparing the environment-friendly nano hydrocarbon fuel according to any one of claims 1 to 10, comprising the steps of:
step S1, mixing gangue with high-quality coal according to a weight ratio of 1:2-1:3 to obtain raw material coal;
s2, pre-crushing the raw material coal to obtain pre-crushed coal dust;
s3, mixing the pre-crushed coal powder with water, and performing nanocrystallization crushing to obtain a nano coal powder slurry, wherein D50 of the nano coal powder is 1.6-3.0 mu m, D90 of the nano coal powder is 5-20 mu m, and D97 of the nano coal powder is 30-42 mu m;
and S4, carrying out hydrogen attaching treatment on the nano coal dust slurry to obtain the environment-friendly nano hydrocarbon fuel.
12. The preparation method of claim 11, wherein the coal gangue comprises, by weight, 10% -12% of carbon, 30% -40% of alumina, 30% -35% of silica, 0.05% -0.15% of calcium oxide and 1.0% -2.5% of ferric oxide;
And/or the high-quality coal has 63-75% of carbon, 11-15% of alumina, 6-10% of silicon dioxide, 0.5-2.0% of calcium oxide and 1.0-2.0% of ferric oxide.
13. The method according to claim 12, wherein the high-quality coal has a carbon content of 70 to 75%, an alumina content of 13 to 15%, a silica content of 8 to 10%, a calcium oxide content of 1.5 to 2.0% and an iron oxide content of 1.0 to 2.0.
14. The method of claim 11, wherein the median particle size of the pre-pulverized coal is 40 to 80 mesh by weight; the part of the pre-crushed coal powder smaller than 150 meshes is less than or equal to 15 percent, and/or the part of the pre-crushed coal powder larger than 30 meshes is less than or equal to 15 percent.
15. The method of claim 14, wherein the pre-pulverized coal is less than 150 mesh fraction 10% by weight, and/or the pre-pulverized coal is greater than 30 mesh fraction 10% by weight, and/or the pre-pulverized coal has a 5-20 mesh passage of 100%.
16. The method according to claim 14, wherein the step S2 comprises, by weight, coarse pulverizing the raw coal to obtain coarse pulverized coal having a particle diameter of 1 to 3mm, and fine pulverizing the coarse pulverized coal to obtain the pre-pulverized coal.
17. The method according to claim 11, wherein the D50 of the nano coal powder is 1.6-2.0 μm, D90 is 5-15 μm, and D97 is less than or equal to 30 μm.
18. The method of claim 17, wherein the nano coal powder slurry has a solids content of 65% to 68%.
19. The method according to claim 11, wherein the step S3 comprises:
Step S31, mixing the pre-pulverized coal and water, performing nano-pulverization to obtain nano-pulverized coal pulverized slurry,
And S32, adding an auxiliary agent into the nano pulverized coal slurry to obtain the nano pulverized coal slurry.
20. The method of claim 19, wherein the auxiliary agent is added to the nano-sized coal powder slurry by emulsifying and shearing.
21. The method according to claim 20, wherein the emulsifying shear has a rotation speed of 2800 to 3000 rpm and an emulsifying period of 25 to 30 minutes.
22. The method of claim 20, wherein the auxiliary agent is added to the nano-pulverized coal slurry in multiple portions.
23. The method of claim 19, wherein the auxiliary agent comprises any one or more of lignin, sodium hexametaphosphate, and sulfonate.
24. The preparation method according to claim 23, wherein the sodium hexametaphosphate addition is 3-6 per mill based on the dry weight of the solids in the nano coal powder slurry, and/or the lignin addition is 0.7-1.1 per mill, and/or the sulfonate addition is 1.3-2.2 per mill.
25. The method according to claim 11, wherein in the step S4, the hydrogen-attaching treatment is performed by introducing hydrogen into the nano pulverized coal slurry.
26. The method of claim 25, wherein the amount of hydrogen introduced into the nano coal powder slurry formed per ton of the raw coal is 2.0-6.0 m 3.
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