CN110331021B - Method for improving combustion heat efficiency of straw biomass charcoal - Google Patents
Method for improving combustion heat efficiency of straw biomass charcoal Download PDFInfo
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- CN110331021B CN110331021B CN201910571618.6A CN201910571618A CN110331021B CN 110331021 B CN110331021 B CN 110331021B CN 201910571618 A CN201910571618 A CN 201910571618A CN 110331021 B CN110331021 B CN 110331021B
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- 239000002028 Biomass Substances 0.000 title claims abstract description 93
- 239000010902 straw Substances 0.000 title claims abstract description 90
- 239000003610 charcoal Substances 0.000 title claims abstract description 45
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005245 sintering Methods 0.000 claims abstract description 52
- 238000002156 mixing Methods 0.000 claims abstract description 38
- 239000000446 fuel Substances 0.000 claims abstract description 31
- 238000010438 heat treatment Methods 0.000 claims abstract description 8
- 239000010445 mica Substances 0.000 claims abstract description 8
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 7
- 239000000203 mixture Substances 0.000 claims abstract description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 20
- 238000002360 preparation method Methods 0.000 claims description 19
- 239000000843 powder Substances 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 11
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 10
- 239000007864 aqueous solution Substances 0.000 claims description 10
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 10
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 8
- 238000003763 carbonization Methods 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 244000068988 Glycine max Species 0.000 claims description 6
- 235000010469 Glycine max Nutrition 0.000 claims description 6
- 235000007164 Oryza sativa Nutrition 0.000 claims description 6
- 240000008042 Zea mays Species 0.000 claims description 6
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims description 6
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims description 6
- 235000005822 corn Nutrition 0.000 claims description 6
- 235000009566 rice Nutrition 0.000 claims description 6
- 239000004576 sand Substances 0.000 claims description 6
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 6
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 6
- 239000012300 argon atmosphere Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 238000005520 cutting process Methods 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 239000011148 porous material Substances 0.000 claims description 5
- 239000002244 precipitate Substances 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 239000006228 supernatant Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 2
- 240000007594 Oryza sativa Species 0.000 claims 1
- 238000010000 carbonizing Methods 0.000 abstract description 5
- 238000003825 pressing Methods 0.000 abstract description 5
- 239000007789 gas Substances 0.000 abstract description 3
- 229910052783 alkali metal Inorganic materials 0.000 abstract description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 150000001875 compounds Chemical class 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 7
- 239000002893 slag Substances 0.000 description 6
- 241000209094 Oryza Species 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 4
- 230000008021 deposition Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000012535 impurity Substances 0.000 description 3
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000007619 statistical method Methods 0.000 description 2
- 241000609240 Ambelania acida Species 0.000 description 1
- 239000004484 Briquette Substances 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000010905 bagasse Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- -1 sawdust Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
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
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
- C10L5/447—Carbonized vegetable substances, e.g. charcoal, or produced by hydrothermal carbonization of biomass
-
- 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
- C10L9/00—Treating solid fuels to improve their combustion
- C10L9/10—Treating solid fuels to improve their combustion by using additives
-
- 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
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Processing Of Solid Wastes (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
The invention relates to the technical field of modern agricultural industry, and discloses a method for improving the combustion thermal efficiency of straw biomass charcoal, which comprises the steps of doping a prepared sintering aid into pretreated biomass straws in the production process of biomass charcoal fuel by researching the combustion characteristic and the law of the combustion dynamics principle, uniformly mixing the mixture in a high-speed mixing mill, pressing the mixture into blocks, placing the blocks into a high-temperature resistant mica plate container, sending the blocks into a muffle furnace for heating and carbonizing to obtain the fuel, wherein the structural characteristic of the biomass charcoal can accelerate the circulation of oxygen, improve the heat transfer efficiency, rapidly raise the ambient temperature around the biomass charcoal, ensure continuous, stable and high-speed combustion, improve the combustion thermal efficiency, prevent alkali metal elements in ash from generating low-melting-point compounds, reduce the slagging rate, improve the slagging temperature of the straw biomass charcoal fuel, and solve the problem of easy caking and slagging in the combustion process of the straw biomass charcoal, and the emission of harmful gases in the combustion process is also obviously reduced.
Description
Technical Field
The invention belongs to the technical field of modern agricultural industry, and particularly relates to a method for improving combustion heat efficiency of straw biomass charcoal.
Background
Biomass fuel: the biomass fuel is prepared by burning biomass materials as fuel, mainly agricultural and forestry wastes (such as straw, sawdust, bagasse, rice chaff and the like) generally, and is mainly different from fossil fuel. In the current national policy and environmental protection standard, the direct combustion biomass belongs to a high-pollution fuel, is only used in a rural large stove and is not allowed to be used in a city. The application of biomass fuel, which is actually mainly biomass briquette fuel, is a novel clean fuel which is prepared by taking agricultural and forestry wastes as raw materials and preparing the raw materials into various briquettes, granules and the like through the processes of crushing, mixing, extruding, drying and the like and can be directly combusted.
Straw biomass charcoal fuel has been used in various industries as a new commercial energy. And because of its high density, high calorific value, regular shape, mobility are good, very convenient can realize burning automatic control, can save the energy cost of large amount for the enterprise. The research of the biomass charcoal fuel in China starts late, the technology is relatively backward, the phenomena that ash deposition and slag formation are easy to occur in the combustion process of the straw biomass charcoal and are not beneficial to combustion are mainly reflected, the combustion process is blocked, the combustion thermal efficiency is low, and the further development and utilization of the straw biomass charcoal dye are seriously restricted by the defect.
Disclosure of Invention
The invention aims to provide a method for improving the combustion heat efficiency of straw biomass charcoal, which aims to solve the problem that the straw biomass charcoal is easy to agglomerate and slag in the combustion process, and the discharge amount of harmful gas in the combustion process is also obviously reduced.
The invention is realized by the following technical scheme:
a method for improving combustion heat efficiency of straw biomass charcoal comprises the steps of mixing a prepared sintering aid into pretreated biomass straws in a biomass charcoal fuel production process, wherein the mixing amount is 0.074-0.076% of the mass of the biomass straws, uniformly mixing the biomass straws in a high-speed mixing roll, pressing the biomass straws into blocks, placing the blocks into a high-temperature resistant mica plate container, feeding the blocks into a muffle furnace for heating, and carbonizing, wherein the preparation method of the sintering aid comprises the following steps:
(1) weighing 310 g of 300-inch sand mud powder and 40-45 g of silicon nitride fine powder, placing the mixture in a vibration mill, mixing the mixture for 2-3 hours, adding 2200-inch sand sodium carbonate aqueous solution while stirring, adding 0.45-0.47 g of sodium dodecyl sulfate after mixing uniformly, continuously stirring for 2-3 hours, standing for 6-8 hours, then carrying out centrifugal treatment for 30-40 minutes at 3000-3500 rpm, pouring out supernatant liquid, and placing the obtained solid precipitate in an oven with the temperature of 100-inch sand 105 ℃ for drying for 10-12 hours;
(2) mixing the dried material prepared in the step (1) with carbon powder according to the mass ratio of 7-8:1, grinding, sieving with a 140-fold-150-mesh sieve, then placing in a vacuum silicon carbide sintering furnace, sintering in an argon atmosphere, heating to 1800-fold-1900 ℃ at the sintering temperature rise speed of 13-14 ℃/min, preserving heat for 3-4 hours, and naturally cooling to room temperature to obtain the sintering aid.
As a further description of the above scheme, in the carbonization process, the temperature rise of the muffle furnace is divided into 3 stages, the temperature rise speed of the first stage is 3.0-3.5 ℃/min, the temperature rises to 230 ℃ for 220-.
As a further description of the above scheme, the prepared sintering aid has a thermal conductivity of between 210-215W/m.K.
As a further description of the above scheme, the prepared sintering aid has a porosity of between 42 and 44%.
As a further description of the above scheme, the pore size of the prepared sintering aid is between 5 and 10 microns.
As a further description of the above scheme, the preparation process of the pretreated biomass straw is as follows: cleaning and impurity-removing the biomass straws, drying at the temperature of 100-110 ℃ until the water content is 6-8%, and then cutting into sections with the length of 2-4 mm.
As a further description of the above scheme, the biomass straw raw material used in the preparation of the straw biomass charcoal fuel is one or more of corn straw, soybean straw and rice straw.
As a further description of the scheme, the mass concentration of the sodium carbonate aqueous solution in the step (1) is 2.6-3.0%.
Compared with the prior art, the invention has the following advantages: in order to solve the problem that ash deposition, slag formation and the like are easy to occur in the combustion process of the existing straw biomass charcoal and are not beneficial to combustion, the invention provides a method for improving the combustion heat efficiency of the straw biomass charcoal, by researching the combustion characteristics and the law of the combustion dynamics principle, in the production process of biomass charcoal fuel, the prepared sintering aid is mixed into the pretreated biomass straws with the mixing amount being 0.074-0.076% of the mass of the biomass straws, the biomass straws are uniformly mixed in a high-speed mixing mill and then pressed into blocks, the blocks are placed in a high-temperature resistant mica plate container and sent into a muffle furnace for heating, and carbonization is carried out to obtain fuel, the structural characteristics of the fuel can accelerate the circulation of oxygen, improve the heat transfer efficiency, quickly raise the ambient temperature around the biomass charcoal, ensure the continuous and stable high-speed operation of combustion, improve the combustion heat efficiency, and prevent alkali metal elements in ash from generating low-melting compounds, reduces the slagging rate, improves the slagging temperature of the straw biomass charcoal fuel, improves the slagging temperature of the fuel by 500-600 ℃ on the original basis, solves the problem that the straw biomass charcoal is easy to agglomerate and slag in the combustion process, and the discharge amount of harmful gas in the combustion process is also obviously reduced, the combustion thermal efficiency of the prepared straw biomass charcoal fuel is obviously improved through a simulation combustion test, the invention effectively solves the problems that the combustion is not facilitated by the ash deposition, slag formation and the like easily generated in the combustion process of the existing straw biomass charcoal, improves the utilization value of straw waste and the strength on environmental protection, can realize the practical significance of resource maximization utilization and environmental protection, the biomass energy source has higher value for development of biomass energy, obviously promotes the healthy and rapid development of national economy and improves the problem of environmental improvement, and is a technical scheme which is extremely worthy of popularization and application.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described with reference to specific embodiments, and it should be understood that the specific embodiments described herein are only used for explaining the present invention and are not used for limiting the technical solutions provided by the present invention.
Example 1
A method for improving combustion heat efficiency of straw biomass charcoal comprises the steps of mixing a prepared sintering aid into pretreated biomass straws in a biomass charcoal fuel production process, wherein the mixing amount is 0.074% of the mass of the biomass straws, uniformly mixing the biomass straws in a high-speed mixing roll, pressing the biomass straws into blocks, placing the blocks into a high-temperature resistant mica plate container, feeding the blocks into a muffle furnace for heating and carbonizing, and the preparation method of the sintering aid comprises the following steps:
(1) weighing 300 g of white mud powder and 40 g of silicon nitride fine powder, placing the white mud powder and the silicon nitride fine powder in a vibration mill, mixing for 2 hours, adding 2200 ml of sodium carbonate aqueous solution under stirring, adding 0.45 g of lauryl sodium sulfate after mixing uniformly, continuously stirring for 2 hours, standing for 6 hours, then centrifuging for 30 minutes at 3000 r/min, pouring out supernatant liquor, and placing the obtained solid precipitate in an oven at 100 ℃ for drying for 10 hours;
(2) and (2) mixing the dried material prepared in the step (1) with carbon powder according to the mass ratio of 7:1, grinding, sieving with a 140-mesh sieve, placing in a vacuum silicon carbide sintering furnace, sintering in an argon atmosphere at the sintering temperature rise speed of 13 ℃/min, raising the temperature to 1800 ℃, preserving heat for 3 hours, and naturally cooling to room temperature to obtain the sintering aid.
As a further description of the above scheme, in the carbonization process, the temperature rise of the muffle furnace is divided into 3 stages, the temperature rise speed in the first stage is 3.0 ℃/min, the temperature rises to 220 ℃, the temperature is maintained for 3 hours, the temperature rise speed in the second stage is 4.0 ℃/min, the temperature rises to 400 ℃, the temperature is maintained for 40 minutes, the temperature rise speed in the third stage is 11 ℃/min, the temperature rises to 950 ℃, the temperature is maintained for 20 minutes, and the muffle furnace is naturally cooled to the room temperature.
As a further description of the above scheme, the prepared sintering aid has a thermal conductivity of between 210-215W/m.K.
As a further description of the above scheme, the prepared sintering aid has a porosity of between 42 and 44%.
As a further description of the above scheme, the pore size of the prepared sintering aid is between 5 and 10 microns.
As a further description of the above scheme, the preparation process of the pretreated biomass straw is as follows: cleaning biomass straws, removing impurities, drying at 100 ℃ until the water content is 6-8%, and cutting into segments with the length of 2-4 mm.
As a further description of the above scheme, the biomass straw raw material used in the preparation of the straw biomass charcoal fuel is one or more of corn straw, soybean straw and rice straw.
As a further description of the above scheme, the mass concentration of the sodium carbonate aqueous solution in the step (1) is 2.6%.
Example 2
A method for improving combustion heat efficiency of straw biomass charcoal comprises the steps of mixing a prepared sintering aid into pretreated biomass straws in a biomass charcoal fuel production process, wherein the mixing amount is 0.075% of the mass of the biomass straws, uniformly mixing the biomass straws in a high-speed mixing roll, pressing the biomass straws into blocks, placing the blocks into a high-temperature resistant mica plate container, feeding the blocks into a muffle furnace for heating, and carbonizing, wherein the preparation method of the sintering aid comprises the following steps:
(1) weighing 305 g of white mud powder and 42 g of silicon nitride fine powder, placing the white mud powder and the silicon nitride fine powder in a vibration mill, mixing for 2.5 hours, adding 2250 ml of sodium carbonate aqueous solution under stirring, mixing uniformly, adding 0.46 g of sodium dodecyl sulfate, continuously stirring for 2.5 hours, standing for 7 hours, then carrying out centrifugal treatment for 35 minutes at 3200 revolutions per minute, pouring out supernatant liquor, and placing the obtained solid precipitate in an oven at 103 ℃ for drying for 11 hours;
(2) and (2) mixing the dried material prepared in the step (1) with carbon powder according to the mass ratio of 7.5:1, grinding, sieving with a 145-mesh sieve, placing in a vacuum silicon carbide sintering furnace, sintering in an argon atmosphere at the sintering temperature rise speed of 13.5 ℃/min, raising the temperature to 1850 ℃, preserving heat for 3.5 hours, and naturally cooling to room temperature to obtain the sintering aid.
As a further description of the above scheme, in the carbonization process, the temperature rise of the muffle furnace is divided into 3 stages, the temperature rise rate in the first stage is 3.2 ℃/min, the temperature rises to 225 ℃, the temperature is maintained for 3.5 hours, the temperature rise rate in the second stage is 4.2 ℃/min, the temperature rises to 405 ℃, the temperature is maintained for 45 minutes, the temperature rise rate in the third stage is 11.5 ℃/min, the temperature rises to 955 ℃, the temperature is maintained for 25 minutes, and the muffle furnace is naturally cooled to room temperature.
As a further description of the above scheme, the prepared sintering aid has a thermal conductivity of between 210-215W/m.K.
As a further description of the above scheme, the prepared sintering aid has a porosity of between 42 and 44%.
As a further description of the above scheme, the pore size of the prepared sintering aid is between 5 and 10 microns.
As a further description of the above scheme, the preparation process of the pretreated biomass straw is as follows: cleaning biomass straws, removing impurities, drying at 105 ℃ until the water content is 6-8%, and cutting into segments with the length of 2-4 mm.
As a further description of the above scheme, the biomass straw raw material used in the preparation of the straw biomass charcoal fuel is one or more of corn straw, soybean straw and rice straw.
As a further description of the above scheme, the mass concentration of the sodium carbonate aqueous solution in the step (1) is 2.8%.
Example 3
A method for improving combustion heat efficiency of straw biomass charcoal comprises the steps of mixing a prepared sintering aid into pretreated biomass straws in a biomass charcoal fuel production process, wherein the mixing amount is 0.076% of the mass of the biomass straws, uniformly mixing the biomass straws in a high-speed mixing roll, pressing the biomass straws into blocks, placing the blocks into a high-temperature resistant mica plate container, feeding the blocks into a muffle furnace for heating and carbonizing, and the preparation method of the sintering aid comprises the following steps:
(1) weighing 310 g of white mud powder and 45 g of silicon nitride fine powder, placing the white mud powder and the silicon nitride fine powder in a vibration mill, mixing for 3 hours, adding 2300 ml of sodium carbonate aqueous solution under stirring, adding 0.47 g of lauryl sodium sulfate after mixing uniformly, continuously stirring for 3 hours, standing for 8 hours, then centrifuging for 40 minutes at 3500 rpm, pouring out supernatant liquor, and placing the obtained solid precipitate in an oven at 105 ℃ for drying for 12 hours;
(2) and (2) mixing the dried material prepared in the step (1) with carbon powder according to the mass ratio of 8:1, grinding, sieving with a 150-mesh sieve, placing in a vacuum silicon carbide sintering furnace, sintering in an argon atmosphere at the sintering temperature rise speed of 14 ℃/min, raising the temperature to 1900 ℃, preserving the temperature for 4 hours, and naturally cooling to room temperature to obtain the sintering aid.
As a further description of the above scheme, in the carbonization process, the temperature rise of the muffle furnace is divided into 3 stages, the temperature rise speed in the first stage is 3.5 ℃/min, the temperature rises to 230 ℃, the temperature is maintained for 4 hours, the temperature rise speed in the second stage is 4.5 ℃/min, the temperature rises to 410 ℃, the temperature is maintained for 50 minutes, the temperature rise speed in the third stage is 12 ℃/min, the temperature rises to 960 ℃, the temperature is maintained for 30 minutes, and the muffle furnace is naturally cooled to the room temperature.
As a further description of the above scheme, the prepared sintering aid has a thermal conductivity of between 210-215W/m.K.
As a further description of the above scheme, the prepared sintering aid has a porosity of between 42 and 44%.
As a further description of the above scheme, the pore size of the prepared sintering aid is between 5 and 10 microns.
As a further description of the above scheme, the preparation process of the pretreated biomass straw is as follows: cleaning biomass straws, removing impurities, drying at 110 ℃ until the water content is 6-8%, and cutting into segments with the length of 2-4 mm.
As a further description of the above scheme, the biomass straw raw material used in the preparation of the straw biomass charcoal fuel is one or more of corn straw, soybean straw and rice straw.
As a further description of the above scheme, the mass concentration of the sodium carbonate aqueous solution in the step (1) is 3.0%.
Comparative example 1
The only difference from example 1 is that in the preparation of the sintering aid, the addition of lime mud powder in step (1) was omitted and an equal amount of silica was used instead, with the remainder being identical.
Comparative example 2
The only difference from example 2 is that in the preparation of the sintering aid, the addition of silicon nitride in step (1) was omitted and the rest remained the same.
Comparative example 3
The only difference from example 3 is that in the preparation of the sintering aid, the addition of silicon nitride in step (1) was omitted and the same amount of silicon carbide was used instead, with the remainder remaining the same.
Comparative example 4
The difference from the example 3 is that the dried material and the carbon powder in the step (2) are mixed according to the mass ratio of 5:2, and the rest is consistent.
Comparative example 5
The only difference from example 3 is that in step (2), the sintering temperature rise rate is 10 ℃/min, the temperature is raised to 2000 ℃, the temperature is kept for 2 hours, and the rest is kept consistent.
Comparative experiment
The method of the embodiment 1-3 and the method of the comparative example 1-5 are respectively used for improving the combustion heat efficiency of the straw biomass charcoal, the method of adding mica powder accounting for 0.5 percent of the mass fraction of the biomass straws as a sintering aid is used as a control group, soybean straws and corn straws with the same source are mixed according to the mass ratio of 1:1 to be used as biomass straw raw materials, the biomass charcoal fuel is prepared according to the same processing technology, each group of methods is used for processing in the preparation process, independent variables are kept consistent in the test, the prepared biomass charcoal fuel is tracked and recorded through a simulated combustion test, the result statistical analysis is carried out (the statistical method is used for carrying out test design before the test, then the test is carried out, test data is recorded, the test result is obtained through analysis, and statistical tools are fully used for explaining the result to the greatest extent in the process), the results are shown in the following table:
(the biomass charcoal fuel samples prepared by each group are put in a muffle furnace for combustion, and an ash sample is prepared to determine the slagging temperature and the slagging rate)
The invention effectively solves the problems that ash deposition and slag formation are easy to occur in the combustion process of the existing straw biomass charcoal and the combustion is not facilitated, improves the utilization value of straw waste and the strength on environmental protection, can realize the practical significance of resource maximization utilization and environmental protection, has higher value on the development of biomass energy, obviously promotes the rapid development of national economic health and improves the environmental improvement problem, and is a technical scheme which is extremely worthy of popularization and use.
Claims (3)
1. A method for improving combustion heat efficiency of straw biomass charcoal is characterized in that in the biomass charcoal fuel production process, a prepared sintering aid is mixed into pretreated biomass straws, the mixing amount is 0.074-0.076% of the mass of the biomass straws, the mixture is uniformly mixed in a high-speed mixing roll and then pressed into blocks, the blocks are placed in a high-temperature resistant mica plate container and sent into a muffle furnace for heating and carbonization, and the preparation method of the sintering aid comprises the following steps:
(1) weighing 310 g of 300-inch sand mud powder and 40-45 g of silicon nitride fine powder, placing the mixture in a vibration mill, mixing the mixture for 2-3 hours, adding 2200-inch sand sodium carbonate aqueous solution while stirring, adding 0.45-0.47 g of sodium dodecyl sulfate after mixing uniformly, continuously stirring for 2-3 hours, standing for 6-8 hours, then carrying out centrifugal treatment for 30-40 minutes at 3000-3500 rpm, pouring out supernatant liquid, and placing the obtained solid precipitate in an oven with the temperature of 100-inch sand 105 ℃ for drying for 10-12 hours;
(2) mixing the dried material prepared in the step (1) with carbon powder according to the mass ratio of 7-8:1, grinding, sieving with a 140-fold-150-mesh sieve, then placing in a vacuum silicon carbide sintering furnace, sintering in an argon atmosphere, wherein the sintering temperature rise speed is 13-14 ℃/min, raising the temperature to 1800-fold-1900 ℃, preserving heat for 3-4 hours, and naturally cooling to room temperature to obtain the sintering aid;
in the carbonization process, the temperature rise of the muffle furnace is divided into 3 stages, the temperature rise speed of the first stage is 3.0-3.5 ℃/min, the temperature rises to 230 ℃ for temperature increase of 220-;
the thermal conductivity of the prepared sintering aid is between 210-215W/m.K;
the porosity of the prepared sintering aid is 42-44%;
the pore size of the prepared sintering aid is between 5 and 10 micrometers;
the mass concentration of the sodium carbonate aqueous solution in the step (1) is 2.6-3.0%.
2. The method for improving the combustion heat efficiency of straw biomass charcoal as claimed in claim 1, wherein the preparation process of the pretreated biomass straw comprises: cleaning and impurity-removing the biomass straws, drying at the temperature of 100-110 ℃ until the water content is 6-8%, and then cutting into sections with the length of 2-4 mm.
3. The method for improving the combustion heat efficiency of straw biomass charcoal as claimed in claim 1, wherein the biomass straw raw material used in the preparation of the straw biomass charcoal fuel is one or more of corn straw, soybean straw and rice straw.
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