CN117925290A - Method for preparing biomass fuel from pulping waste - Google Patents
Method for preparing biomass fuel from pulping waste Download PDFInfo
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- CN117925290A CN117925290A CN202410323729.6A CN202410323729A CN117925290A CN 117925290 A CN117925290 A CN 117925290A CN 202410323729 A CN202410323729 A CN 202410323729A CN 117925290 A CN117925290 A CN 117925290A
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- biomass fuel
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- pulping waste
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- 238000004537 pulping Methods 0.000 title claims abstract description 153
- 239000002699 waste material Substances 0.000 title claims abstract description 124
- 239000002028 Biomass Substances 0.000 title claims abstract description 88
- 239000000446 fuel Substances 0.000 title claims abstract description 88
- 238000000034 method Methods 0.000 title claims abstract description 70
- 238000000465 moulding Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims description 64
- 239000002131 composite material Substances 0.000 claims description 48
- 239000007787 solid Substances 0.000 claims description 37
- DNIAPMSPPWPWGF-UHFFFAOYSA-N Propylene glycol Chemical compound CC(O)CO DNIAPMSPPWPWGF-UHFFFAOYSA-N 0.000 claims description 36
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 36
- 239000000654 additive Substances 0.000 claims description 30
- 230000000996 additive effect Effects 0.000 claims description 30
- 238000013329 compounding Methods 0.000 claims description 25
- 238000002156 mixing Methods 0.000 claims description 24
- 150000001875 compounds Chemical class 0.000 claims description 23
- 239000000126 substance Substances 0.000 claims description 21
- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims description 20
- VCJMYUPGQJHHFU-UHFFFAOYSA-N iron(3+);trinitrate Chemical compound [Fe+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O VCJMYUPGQJHHFU-UHFFFAOYSA-N 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 15
- 238000002360 preparation method Methods 0.000 claims description 15
- 238000005904 alkaline hydrolysis reaction Methods 0.000 claims description 13
- 239000000440 bentonite Substances 0.000 claims description 13
- 229910000278 bentonite Inorganic materials 0.000 claims description 13
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims description 13
- 239000010459 dolomite Substances 0.000 claims description 13
- 229910000514 dolomite Inorganic materials 0.000 claims description 13
- 239000002440 industrial waste Substances 0.000 claims description 13
- 239000000843 powder Substances 0.000 claims description 13
- IMQLKJBTEOYOSI-GPIVLXJGSA-N Inositol-hexakisphosphate Chemical compound OP(O)(=O)O[C@H]1[C@H](OP(O)(O)=O)[C@@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@H](OP(O)(O)=O)[C@@H]1OP(O)(O)=O IMQLKJBTEOYOSI-GPIVLXJGSA-N 0.000 claims description 12
- IMQLKJBTEOYOSI-UHFFFAOYSA-N Phytic acid Natural products OP(O)(=O)OC1C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C(OP(O)(O)=O)C1OP(O)(O)=O IMQLKJBTEOYOSI-UHFFFAOYSA-N 0.000 claims description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 12
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 12
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 12
- 229940068041 phytic acid Drugs 0.000 claims description 12
- 235000002949 phytic acid Nutrition 0.000 claims description 12
- 239000000467 phytic acid Substances 0.000 claims description 12
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 12
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 12
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 11
- BNGXYYYYKUGPPF-UHFFFAOYSA-M (3-methylphenyl)methyl-triphenylphosphanium;chloride Chemical compound [Cl-].CC1=CC=CC(C[P+](C=2C=CC=CC=2)(C=2C=CC=CC=2)C=2C=CC=CC=2)=C1 BNGXYYYYKUGPPF-UHFFFAOYSA-M 0.000 claims description 10
- 229920001213 Polysorbate 20 Polymers 0.000 claims description 10
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 239000000256 polyoxyethylene sorbitan monolaurate Substances 0.000 claims description 10
- 235000010486 polyoxyethylene sorbitan monolaurate Nutrition 0.000 claims description 10
- 229940068977 polysorbate 20 Drugs 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 238000001704 evaporation Methods 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 238000002203 pretreatment Methods 0.000 claims description 4
- 238000001291 vacuum drying Methods 0.000 claims 2
- 238000002485 combustion reaction Methods 0.000 abstract description 26
- 230000007774 longterm Effects 0.000 abstract description 12
- 238000003860 storage Methods 0.000 abstract description 6
- 238000004064 recycling Methods 0.000 abstract description 5
- 239000002994 raw material Substances 0.000 description 28
- 239000003921 oil Substances 0.000 description 11
- 239000000779 smoke Substances 0.000 description 11
- 239000010902 straw Substances 0.000 description 11
- 229920001131 Pulp (paper) Polymers 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 6
- 238000001514 detection method Methods 0.000 description 6
- 229920002678 cellulose Polymers 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 101710121765 Endo-1,4-beta-xylanase Proteins 0.000 description 4
- 102000004190 Enzymes Human genes 0.000 description 4
- 108090000790 Enzymes Proteins 0.000 description 4
- 241001349804 Juncus alpinoarticulatus Species 0.000 description 4
- 241000209140 Triticum Species 0.000 description 4
- 235000021307 Triticum Nutrition 0.000 description 4
- 239000004480 active ingredient Substances 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 241000196324 Embryophyta Species 0.000 description 3
- 239000003513 alkali Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 238000007493 shaping process Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- 244000025254 Cannabis sativa Species 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 238000003672 processing method Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 235000014676 Phragmites communis Nutrition 0.000 description 1
- 244000082204 Phyllostachys viridis Species 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229920003086 cellulose ether Polymers 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- -1 sawdust Substances 0.000 description 1
- 239000004449 solid propellant Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention provides a method for preparing biomass fuel from pulping waste, and belongs to the field of recycling of pulping waste. The method for preparing biomass fuel from pulping waste comprises the following steps: pretreatment and molding. The method for preparing the biomass fuel from the pulping waste can effectively solve the problems of low heat value, high ash content and obvious slagging existing in the biomass fuel prepared from the pulping waste; and simultaneously improves the anti-falling performance and long-term stability of the biomass fuel prepared by the pulping waste, and further avoids the problems of reduced combustion quality, reduced heat value and poor combustion performance of the biomass fuel prepared by the pulping waste in the long-term storage process.
Description
Technical Field
The invention relates to the field of pulping waste recycling, in particular to a method for preparing biomass fuel from pulping waste.
Background
The paper pulp is a fibrous substance prepared by taking plant fibers as raw materials and adopting different processing methods, and can be divided into mechanical paper pulp, chemical paper pulp and chemical mechanical paper pulp according to the processing methods; the fiber raw materials can be divided into wood pulp, straw pulp, hemp pulp, reed pulp, cane pulp, bamboo pulp, broken cloth pulp and the like according to the used fiber raw materials; but also can be classified into refined pulp, bleached pulp, unbleached pulp, high-yield pulp, semi-chemical pulp and the like according to different purities. Pulp is commonly used in the manufacture of paper and board; refined pulp is often used as a raw material for producing cellulose derivatives such as cellulose esters and cellulose ethers, in addition to specialty papers. The existing pulping process is to pulp raw materials such as grass sheets, straw, wood and the like under certain temperature and pressure conditions, cause cellulose to absorb water in a short time, and disintegrate into pulp after the cellulose structure collapses, so that the cellulose pulp is finally prepared.
However, a certain amount of pulping waste is generated in the pulping process, the recycling value of the pulping waste is low, and the common treatment method is to use the pulping waste as an alternative fuel and directly apply the pulping waste to the combustion heat supply process of power plants, cement plants and the like.
The biomass fuel is prepared by combusting combustible biomass materials as fuel and is generally prepared from agricultural and forestry waste (such as straw, sawdust, bagasse, rice chaff and the like). The biomass fuel is obviously different from fossil fuel, is a renewable resource, has wide raw material sources and relatively low production cost. Meanwhile, carbon dioxide released by biomass fuel in the combustion process is mainly absorbed and fixed from the atmosphere in the growth process of plants, so that carbon emission is relatively low and pollution to the environment is small.
The existing biomass fuel prepared by pulping waste has the problems of low heat value, large ash content and obvious slag formation; although the existing biomass fuel preparation process can be added with an ignition agent, an anti-slagging agent and the like to improve the defects of the biomass fuel, the existing biomass fuel preparation process has poor compatibility with pulping waste in actual preparation, and the technical problems of the biomass fuel prepared by the pulping waste cannot be obviously improved; the addition of various auxiliary materials also leads to easy fragmentation and unsatisfactory anti-drop performance of the prepared biomass fuel. Furthermore, in the long-term storage process of the biomass fuel prepared by adopting pulping waste, the problems of reduced combustion quality, reduced heat value and poor combustion performance exist, and the long-term stability of the biomass fuel is still to be further improved.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method for preparing biomass fuel from pulping waste, which can effectively solve the problems of low heat value, high ash content and obvious slagging existing in biomass fuel prepared from pulping waste; and simultaneously improves the anti-falling performance and long-term stability of the biomass fuel prepared by the pulping waste, and further avoids the problems of reduced combustion quality, reduced heat value and poor combustion performance of the biomass fuel prepared by the pulping waste in the long-term storage process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a method for preparing biomass fuel from pulping waste comprises the following steps: pretreatment and molding.
The pretreatment method comprises the steps of collecting and combining pulping waste liquid of an alkaline hydrolysis working section, an enzymolysis working section and a pulping working section in the pulping process, evaporating and concentrating until the solid content is 40-45wt% to obtain concentrated pulping waste liquid; crushing pulping waste materials of a material preparation working section in the pulping process until the length is not more than 1.5mm, and obtaining crushed pulping waste materials; and then adding the concentrated pulping waste liquid, the crushed pulping waste material, the composite additive, the industrial waste oil and the propylene glycol into a mixing kettle, stirring and mixing for 20-40min, and standing for 2-3h to obtain a pretreatment substance.
In the pretreatment, the pulping waste liquid in the alkaline hydrolysis section is alkaline waste liquid containing small-size solids (such as pulping raw material residues) which is left after the solid raw materials are separated and removed by adopting alkaline liquor to treat pulping raw materials (such as Chinese alpine rush, wheat straw, straw and the like);
The pulping waste liquid in the enzymolysis section is the enzymolysis waste liquid containing small-sized solids (such as enzymolysis residues) which is left after the alkaline hydrolysis pulping raw material is treated by enzyme (such as xylanase, glucanase and the like) and the solid raw material is separated and removed;
The pulping waste liquid of the pulping section is the pulping waste liquid containing a small amount of solids, which is generated in the pulping process.
In the pretreatment, the weight ratio of the concentrated pulping waste liquid to the crushed pulping waste material to the composite additive to the industrial waste oil to the propylene glycol is 5-6:100-105:25-29:8-10:3-4.
The industrial waste oil can be selected from waste gasoline and waste lubricating oil.
The composite additive is prepared by the following steps: pretreatment, primary compounding and secondary compounding.
The pretreatment method comprises the steps of putting active carbon, bentonite and dolomite powder into a high-speed mixer, mixing for 5-10min at a rotating speed of 1000-1500rpm, spraying polysorbate-20, mixing for 10-20min continuously, and drying to obtain a pretreatment substance.
In the pretreatment, the weight ratio of the active carbon to the bentonite to the dolomite powder to the polysorbate-20 is 5-6:3-4:1-1.5:0.2-0.3.
The primary compounding method comprises the steps of adding a pretreatment into primary compound liquid with the weight being 3-4 times that of the pretreatment, stirring for 10-20min, heating to 40-50 ℃, and preserving heat; then dripping sodium hydroxide solution with the concentration of 0.8-1mol/L at the dripping rate of 0.6-0.8mL/min, stopping dripping the sodium hydroxide solution until the pH value is 7.5-8, continuously stirring for 20-30min, standing for 3-4h, filtering out solid matters, washing the solid matters by using deionized water with the weight of 4-5 times, drying at 110-120 ℃ for 7-9h, roasting at 220-250 ℃ for 2-3h, and naturally cooling to obtain the primary compound.
In the primary compounding, the primary compounding liquid is deionized water solution in which ferric nitrate, aluminum nitrate and cerium nitrate are dissolved; the mass concentration of ferric nitrate in the primary composite liquid is 9-10wt%, the mass concentration of aluminum nitrate is 9-10wt%, and the mass concentration of cerium nitrate is 4-4.5wt%.
The secondary compounding method is that the primary compound, sodium carboxymethyl cellulose, polyvinyl alcohol 2488 and phytic acid are put into a mixer, mixed evenly at 600-800rpm, and granulated into particles with the particle size of 1-1.5mm, and the composite additive is prepared.
In the secondary compounding, the weight ratio of the primary compound to the sodium carboxymethyl cellulose to the polyvinyl alcohol 2488 to the phytic acid is 100-110:1-1.5:3-4:0.3-0.4.
The molding method comprises the steps of putting a pretreated substance into a mold of a hot press molding machine, molding at 70-75MPa and 120-130 ℃ for 30-40s, and demolding to obtain a molded blank; and then placing the molded green body in an environment with the vacuum degree of 0.06-0.08MPa, and drying at 80-90 ℃ until the water content is less than 8wt percent to prepare the biomass fuel.
Compared with the prior art, the invention has the beneficial effects that:
(1) According to the method for preparing biomass fuel from pulping waste, the biomass fuel is prepared by utilizing pulping waste and pulping waste liquid generated in the pulping process, and a pretreatment product is prepared by combining a composite additive, industrial waste oil and propylene glycol in the pretreatment process; the pretreated matter is molded and dried to prepare biomass fuel; meanwhile, in the preparation of the composite additive, after the pretreatment substance is prepared by combining activated carbon, bentonite and dolomite powder, the pretreatment substance is combined with the active ingredients in primary composite liquid in an in-situ generation mode in primary composite, so that the primary composite is prepared, the combustion stability of biomass fuel is improved, the emission of flue gas is reduced, the combustion is promoted fully, and the slagging in the combustion process of the biomass fuel is reduced; in the secondary compounding, the primary compound is combined with each active ingredient, so that the combination property of the compound additive and other raw materials in pretreatment is improved, and the combustion performance of the biomass fuel is improved; the technical means are mutually matched, so that the problems of low heat value, high ash content and obvious slag formation in biomass fuel prepared by pulping waste can be effectively solved; and simultaneously improves the anti-falling performance and long-term stability of the biomass fuel prepared by the pulping waste, and further avoids the problems of reduced combustion quality, reduced heat value and poor combustion performance of the biomass fuel prepared by the pulping waste in the long-term storage process.
(2) According to the method for preparing the biomass fuel from the pulping waste, the combustion heat value of the prepared biomass fuel is 18.2-18.8MJ/kg, the slagging rate is 0.94-1.01%, the ash content is 8.7-8.8wt%, the smoke emission is 9.0-9.2kg/h, the smoke blackness is less than or equal to 1 level, the recycling of the pulping waste can be effectively realized, waste materials are changed into valuable materials, and the biomass fuel with good combustion performance is prepared.
(3) According to the method for preparing the biomass fuel from the pulping waste, the prepared biomass fuel has good anti-falling performance, the anti-falling performance of the biomass fuel is 99.74-99.80% through experiments, and the compressive strength is 63.1-64.2MPa.
(4) The method for preparing biomass fuel from pulping waste has good long-term stability, the combustion heat value of the biomass fuel still can reach 17.7-18.4MJ/kg after the biomass fuel is kept stand and stored for 8 months in an environment with the temperature of 30 ℃ and the relative humidity of 60%, the slagging rate still can reach 0.95-1.02%, the ash content still can reach 8.8-9.0wt%, the smoke emission still can reach 9.0-9.3kg/h, the smoke blackness is less than or equal to 1 level, the falling resistance still can reach 99.44-99.52%, and the compressive strength still can reach 61.8-63.1MPa.
(5) The method for preparing biomass fuel from pulping waste can effectively utilize pulping waste generated in the large-scale pulping process to prepare biomass fuel, has simple preparation process, is suitable for being matched with large-scale pulping, and realizes recycling of pulping waste.
Detailed Description
Specific embodiments of the present invention will now be described in order to provide a clearer understanding of the technical features, objects and effects of the present invention.
Example 1
A method for preparing biomass fuel by pulping waste material specifically comprises the following steps:
1. pretreatment of
Collecting and combining pulping waste liquid of an alkaline hydrolysis working section, an enzymolysis working section and a pulping working section in the pulping process, evaporating and concentrating until the solid content is 40wt% to obtain concentrated pulping waste liquid; crushing pulping waste materials of a material preparation working section in the pulping process until the length is not more than 1.5mm, and obtaining crushed pulping waste materials; and then adding the concentrated pulping waste liquid, the crushed pulping waste material, the composite additive, the industrial waste oil and the propylene glycol into a mixing kettle, stirring and mixing for 20min, and standing for 2h to obtain a pretreated substance.
Wherein, the pulping waste liquid in the alkaline hydrolysis section is alkaline waste liquid containing small-sized solid matters (such as pulping raw material residues) which is left after the solid raw materials are separated and removed by adopting alkali liquor to treat pulping raw materials (such as Chinese alpine rush, wheat straw, straw and the like).
The pulping waste liquid in the enzymolysis section is the enzymolysis waste liquid containing small-sized solid matters (such as enzymolysis residues) which is left after the alkaline hydrolysis pulping raw material is treated by enzyme (such as xylanase, glucanase and the like) and the solid raw material is separated and removed.
The pulping waste liquid of the pulping section is the pulping waste liquid containing a small amount of solids, which is generated in the pulping process.
The weight ratio of the concentrated pulping waste liquid to the crushed pulping waste material to the composite additive to the industrial waste oil to the propylene glycol is 5:100:25:8:3.
The preparation method of the composite additive comprises the following steps:
1) Pretreatment of
Putting active carbon, bentonite and dolomite powder into a high-speed mixer, mixing for 5min at 1000rpm, spraying polysorbate-20, mixing for 10min, and drying to obtain the pretreatment product.
Wherein the weight ratio of the active carbon to the bentonite to the dolomite powder to the polysorbate-20 is 5:3:1:0.2.
2) Disposable composite
Adding the pretreated substance into the primary composite liquid with the weight being 3 times that of the pretreated substance, stirring for 10min, heating to 40 ℃, and preserving heat; then dripping sodium hydroxide solution with the concentration of 0.8mol/L at the dripping rate of 0.6L/min, stopping dripping the sodium hydroxide solution when the pH value is 7.5, continuously stirring for 20min, standing for 3h, filtering out solid matters, washing the solid matters with deionized water with the weight of 4 times, drying at 110 ℃ for 7h, roasting at 220 ℃ for 2h, and naturally cooling to obtain the primary compound.
Wherein the primary composite liquid is deionized water solution in which ferric nitrate, aluminum nitrate and cerium nitrate are dissolved; the mass concentration of ferric nitrate in the primary composite liquid is 9wt%, the mass concentration of aluminum nitrate is 9wt%, and the mass concentration of cerium nitrate is 4wt%.
3) Secondary compounding
Adding the primary compound, sodium carboxymethyl cellulose, polyvinyl alcohol 2488 and phytic acid into a mixer, uniformly mixing at 600rpm, and granulating to obtain granules with the particle size of 1mm to obtain the composite additive.
Wherein, the weight ratio of the primary compound to the sodium carboxymethyl cellulose to the polyvinyl alcohol 2488 to the phytic acid is 100:1:3:0.3.
2. Shaping
Putting the pretreated matter into a die of a hot press forming machine, forming at the forming pressure of 70MPa and the forming temperature of 120 ℃ for 30s, and demolding to obtain a formed blank; and then placing the molded green body in an environment with the vacuum degree of 0.06MPa, and drying at 80 ℃ until the water content is less than 8wt% to prepare the biomass fuel.
Example 2
A method for preparing biomass fuel by pulping waste material specifically comprises the following steps:
1. pretreatment of
Collecting and combining pulping waste liquid of an alkaline hydrolysis working section, an enzymolysis working section and a pulping working section in the pulping process, evaporating and concentrating until the solid content is 43wt% to obtain concentrated pulping waste liquid; crushing pulping waste materials of a material preparation working section in the pulping process until the length is not more than 1.5mm, and obtaining crushed pulping waste materials; and then adding the concentrated pulping waste liquid, the crushed pulping waste material, the composite additive, the industrial waste oil and the propylene glycol into a mixing kettle, stirring and mixing for 30min, and standing for 2.5h to obtain a pretreated substance.
Wherein, the pulping waste liquid in the alkaline hydrolysis section is alkaline waste liquid containing small-sized solid matters (such as pulping raw material residues) which is left after the solid raw materials are separated and removed by adopting alkali liquor to treat pulping raw materials (such as Chinese alpine rush, wheat straw, straw and the like).
The pulping waste liquid in the enzymolysis section is the enzymolysis waste liquid containing small-sized solid matters (such as enzymolysis residues) which is left after the alkaline hydrolysis pulping raw material is treated by enzyme (such as xylanase, glucanase and the like) and the solid raw material is separated and removed.
The pulping waste liquid of the pulping section is the pulping waste liquid containing a small amount of solids, which is generated in the pulping process.
The weight ratio of the concentrated pulping waste liquid to the crushed pulping waste material to the composite additive to the industrial waste oil to the propylene glycol is 5.4:103:28:9:3.6.
The preparation method of the composite additive comprises the following steps:
1) Pretreatment of
Putting active carbon, bentonite and dolomite powder into a high-speed mixer, mixing for 8min at 1300rpm, spraying polysorbate-20, mixing for 15min, and drying to obtain the pretreatment product.
Wherein the weight ratio of the active carbon to the bentonite to the dolomite powder to the polysorbate-20 is 5.5:3.7:1.3:0.25.
2) Disposable composite
Adding the pretreated substance into the primary composite liquid with the weight being 3.5 times that of the pretreated substance, stirring for 15min, heating to 45 ℃, and preserving heat; then dripping sodium hydroxide solution with the concentration of 0.9mol/L at the dripping rate of 0.7mL/min, stopping dripping the sodium hydroxide solution until the pH value is 7.8, continuously stirring for 25min, standing for 3.5h, filtering out solid matters, washing the solid matters by using deionized water with the weight of 4.5 times, drying at 115 ℃ for 8h, roasting at 235 ℃ for 2.5h, and naturally cooling to obtain the primary compound.
Wherein the primary composite liquid is deionized water solution in which ferric nitrate, aluminum nitrate and cerium nitrate are dissolved; the mass concentration of ferric nitrate in the primary composite liquid is 9.6wt%, the mass concentration of aluminum nitrate is 9.8wt%, and the mass concentration of cerium nitrate is 4.2wt%.
3) Secondary compounding
Adding the primary compound, sodium carboxymethyl cellulose, polyvinyl alcohol 2488 and phytic acid into a mixer, uniformly mixing at 700rpm, and granulating to obtain granules with the particle size of 1.2mm to prepare the composite additive.
Wherein, the weight ratio of the primary compound to the sodium carboxymethyl cellulose to the polyvinyl alcohol 2488 to the phytic acid is 105:1.2:3.5:0.35.
2. Shaping
Putting the pretreated matter into a die of a hot press forming machine, forming at the forming pressure of 72MPa and the forming temperature of 125 ℃ for 35s, and demolding to obtain a formed blank; and then placing the molded green body in an environment with the vacuum degree of 0.07MPa, and drying at 85 ℃ until the water content is less than 8wt% to prepare the biomass fuel.
Example 3
A method for preparing biomass fuel by pulping waste material specifically comprises the following steps:
1. pretreatment of
Collecting and combining pulping waste liquid of an alkaline hydrolysis working section, an enzymolysis working section and a pulping working section in the pulping process, evaporating and concentrating until the solid content is 45wt% to obtain concentrated pulping waste liquid; crushing pulping waste materials of a material preparation working section in the pulping process until the length is not more than 1.5mm, and obtaining crushed pulping waste materials; and then adding the concentrated pulping waste liquid, the crushed pulping waste material, the composite additive, the industrial waste oil and the propylene glycol into a mixing kettle, stirring and mixing for 40min, and standing for 3h to obtain a pretreated substance.
Wherein, the pulping waste liquid in the alkaline hydrolysis section is alkaline waste liquid containing small-sized solid matters (such as pulping raw material residues) which is left after the solid raw materials are separated and removed by adopting alkali liquor to treat pulping raw materials (such as Chinese alpine rush, wheat straw, straw and the like).
The pulping waste liquid in the enzymolysis section is the enzymolysis waste liquid containing small-sized solid matters (such as enzymolysis residues) which is left after the alkaline hydrolysis pulping raw material is treated by enzyme (such as xylanase, glucanase and the like) and the solid raw material is separated and removed.
The pulping waste liquid of the pulping section is the pulping waste liquid containing a small amount of solids, which is generated in the pulping process.
The weight ratio of the concentrated pulping waste liquid to the crushed pulping waste material to the composite additive to the industrial waste oil to the propylene glycol is 6:105:29:10:4.
The preparation method of the composite additive comprises the following steps:
1) Pretreatment of
Putting active carbon, bentonite and dolomite powder into a high-speed mixer, mixing for 10min at 1500rpm, spraying polysorbate-20, mixing for 20min, and drying to obtain the pretreatment product.
Wherein the weight ratio of the active carbon to the bentonite to the dolomite powder to the polysorbate-20 is 6:4:1.5:0.3.
2) Disposable composite
Adding the pretreated substance into the primary composite liquid with the weight being 4 times that of the pretreated substance, stirring for 20min, heating to 50 ℃, and preserving heat; then dripping sodium hydroxide solution with the concentration of 1mol/L at the dripping rate of 0.8mL/min, stopping dripping the sodium hydroxide solution until the pH value is 8, continuously stirring for 30min, standing for 4h, filtering out solid, washing the solid with deionized water with the weight of 5 times, drying at 120 ℃ for 9h, roasting at 250 ℃ for 3h, and naturally cooling to obtain the primary compound.
Wherein the primary composite liquid is deionized water solution in which ferric nitrate, aluminum nitrate and cerium nitrate are dissolved; the mass concentration of ferric nitrate in the primary composite liquid is 10wt%, the mass concentration of aluminum nitrate is 10wt%, and the mass concentration of cerium nitrate is 4.5wt%.
3) Secondary compounding
Adding the primary compound, sodium carboxymethyl cellulose, polyvinyl alcohol 2488 and phytic acid into a mixer, uniformly mixing at 800rpm, and granulating to obtain granules with the particle size of 1.5mm to prepare the composite additive.
Wherein, the weight ratio of the primary compound to the sodium carboxymethyl cellulose to the polyvinyl alcohol 2488 to the phytic acid is 110:1.5:4:0.4.
2. Shaping
Putting the pretreated matter into a die of a hot press forming machine, forming at the forming pressure of 75MPa and the forming temperature of 130 ℃ for 40s, and demolding to obtain a formed blank; and then placing the molded green body in an environment with the vacuum degree of 0.08MPa, and drying at 90 ℃ until the water content is less than 8wt% to prepare the biomass fuel.
Comparative example 1
The technical scheme of the embodiment 2 is adopted, and the difference is that: 1) In the pretreatment process of preparing the composite additive, the use of bentonite and dolomite powder is omitted; 2) The secondary compounding step is omitted and an equivalent amount of primary compound is used in the pretreatment step instead of the compounding additive.
Comparative example 2
The technical scheme of the embodiment 2 is adopted, and the difference is that: in the preparation of the composite additive, the primary compounding step is omitted, and in the subsequent secondary compounding step, the pretreatment, ferric oxide, aluminum oxide, sodium carboxymethyl cellulose, polyvinyl alcohol 2488 and phytic acid are mixed and granulated to prepare the composite additive. Wherein, the addition amount of the pretreatment, ferric oxide, aluminum oxide, sodium carboxymethyl cellulose, polyvinyl alcohol 2488 and phytic acid is 105:30:30:1.2:3.5:0.35.
The biomass fuels were prepared by the methods of examples 1 to 3 and comparative examples 1 to 2, and the combustion heat value, the slagging rate, the ash content, the smoke emission, the smoke blackness, the drop resistance and the compressive strength of the biomass fuels were detected.
Specifically, the method for detecting the combustion heat value refers to the relevant regulations of the standard GB/T30727-2014 'method for measuring the heat value of solid biomass fuel', an automatic oxygen bomb calorimeter method is adopted for detection, each biomass fuel is detected three times respectively, and the average value is taken as the combustion heat value of the biomass fuel.
The detection method of the slagging rate refers to relevant regulations of the standard NB/T34025-2015 "test method of slagging property of biomass solid fuels".
The ash content detection method refers to the standard NY/T1881.5-2010, part 5 of the test method for solid biomass fuels: ash, related regulations.
The detection method of smoke emission and smoke blackness refers to the relevant regulations of the standard GB/T5468-1991 "boiler smoke testing method".
The drop resistance detection method is that the mass of the biomass fuel sample prepared by the methods of the examples 1-3 and the comparative examples 1-2 is respectively weighed and recorded as M 0; then respectively placing each biomass fuel sample at the position of 2M in height, and weighing the mass of the biomass fuel sample after free falling body falls to the ground without initial speed release, and recording the mass as M 1; the residual mass of the biomass fuel after falling is calculated to be the original mass percentage, namely (M 1/M0) multiplied by 100 percent. Three tests were performed on each biomass fuel, and an average was taken.
The compressive strength of the biomass fuel prepared by the methods of examples 1-3 and comparative examples 1-2 was measured by a universal tester.
The specific results are shown in the following table:
Further, the biomass fuels prepared by the methods of examples 1-3 and comparative examples 1-2 were placed in an environment with a temperature of 30 ℃ and a relative humidity of 60%, and after standing and storing for 8 months, the burning heat value, the slagging rate, the ash content, the smoke emission, the smoke blackness, the anti-drop property and the compressive strength of the biomass fuels after long-term storage were detected by the detection methods. The specific results are shown in the following table:
It can be seen that the method for preparing biomass fuel from pulping waste material of the invention prepares biomass fuel by utilizing pulping waste material and pulping waste liquid generated in the pulping process, and combines a composite additive, industrial waste oil and propylene glycol in the pretreatment process to prepare a pretreated matter; the pretreated matter is molded and dried to prepare biomass fuel; meanwhile, in the preparation of the composite additive, after the pretreatment substance is prepared by combining activated carbon, bentonite and dolomite powder, the pretreatment substance is combined with the active ingredients in primary composite liquid in an in-situ generation mode in primary composite, so that the primary composite is prepared, the combustion stability of biomass fuel is improved, the emission of flue gas is reduced, the combustion is promoted fully, and the slagging in the combustion process of the biomass fuel is reduced; in the secondary compounding, the primary compound is combined with each active ingredient, so that the combination property of the compound additive and other raw materials in pretreatment is improved, and the combustion performance of the biomass fuel is improved; the technical means are mutually matched, so that the problems of low heat value, high ash content and obvious slag formation in biomass fuel prepared by pulping waste can be effectively solved; and simultaneously improves the anti-falling performance and long-term stability of the biomass fuel prepared by the pulping waste, and further avoids the problems of reduced combustion quality, reduced heat value and poor combustion performance of the biomass fuel prepared by the pulping waste in the long-term storage process.
The percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. 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 (10)
1. A method for preparing biomass fuel by pulping waste, which is characterized by comprising the following steps: pretreatment and molding;
The pretreatment method comprises the steps of collecting and combining pulping waste liquid of an alkaline hydrolysis working section, an enzymolysis working section and a pulping working section in the pulping process, evaporating and concentrating until the solid content is 40-45wt% to obtain concentrated pulping waste liquid; crushing pulping waste materials of a material preparation working section in the pulping process to obtain crushed pulping waste materials; then adding concentrated pulping waste liquid, crushed pulping waste material, composite additive, industrial waste oil and propylene glycol into a mixing kettle, uniformly stirring and mixing, and standing to obtain a pretreated substance;
the composite additive is prepared by the following steps: pretreatment, primary compounding and secondary compounding;
The pretreatment method comprises the steps of putting active carbon, bentonite and dolomite powder into a high-speed mixer, uniformly mixing, spraying polysorbate-20, continuously mixing, and drying to obtain a pretreated substance;
The primary compounding method comprises the steps of adding a pretreatment into primary compound liquid, uniformly stirring, heating to 40-50 ℃, and preserving heat; then stirring and dripping sodium hydroxide solution until the pH value is 7.5-8, stopping dripping sodium hydroxide solution, continuing stirring, standing for 3-4h, filtering out solid matters, washing the solid matters by deionized water, drying, roasting, and naturally cooling to obtain a primary compound;
the primary composite liquid is deionized water solution in which ferric nitrate, aluminum nitrate and cerium nitrate are dissolved;
The secondary compounding method is that the primary compound, sodium carboxymethyl cellulose, polyvinyl alcohol 2488 and phytic acid are uniformly mixed and granulated to prepare the compound additive;
The molding method is that the pretreated matter is subjected to hot press molding and then is dried in vacuum until the water content is less than 8wt percent, so that the biomass fuel is prepared.
2. The method for preparing biomass fuel from pulping waste according to claim 1, wherein in the pretreatment, the weight ratio of the concentrated pulping waste liquid, the crushed pulping waste material, the composite additive, the industrial waste oil and the propylene glycol is 5-6:100-105:25-29:8-10:3-4.
3. The method for preparing biomass fuel from pulping waste according to claim 1, wherein in the pretreatment, the mixing speed is 1000-1500rpm;
The weight ratio of the active carbon to the bentonite to the dolomite powder to the polysorbate-20 is 5-6:3-4:1-1.5:0.2-0.3.
4. The method for preparing biomass fuel from pulping waste according to claim 1, wherein the weight ratio of the pretreatment to the primary composite liquid in the primary composite is 1:3-4.
5. The method for preparing biomass fuel from pulping waste according to claim 1, wherein in the primary compounding, the dropping rate of sodium hydroxide solution is 0.6-0.8mL/min;
The concentration of the sodium hydroxide solution is 0.8-1mol/L.
6. The method for preparing biomass fuel from pulping waste according to claim 1, wherein in the primary compounding, the drying temperature is 110-120 ℃ and the drying time is 7-9h;
The roasting temperature is 220-250 ℃ and the roasting time is 2-3h.
7. The method for preparing biomass fuel from pulping waste according to claim 1, wherein in the primary compounding, the mass concentration of ferric nitrate in the primary compounding liquid is 9-10wt%, the mass concentration of aluminum nitrate is 9-10wt%, and the mass concentration of cerium nitrate is 4-4.5wt%.
8. The method for preparing biomass fuel from pulping waste according to claim 1, wherein in the secondary compounding, the weight ratio of primary compound, sodium carboxymethyl cellulose, polyvinyl alcohol 2488 and phytic acid is 100-110:1-1.5:3-4:0.3-0.4.
9. The method for preparing biomass fuel from pulping waste according to claim 1, wherein in the forming, the forming pressure is 70-75MPa, the forming temperature is 120-130 ℃, and the forming time is 30-40s.
10. The method for preparing biomass fuel from pulping waste according to claim 1, wherein in the forming, the vacuum degree of vacuum drying is 0.06-0.08MPa, and the vacuum drying temperature is 80-90 ℃.
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