CN116218557A - Addition method of lignocellulose carbon fixing agent - Google Patents
Addition method of lignocellulose carbon fixing agent Download PDFInfo
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- CN116218557A CN116218557A CN202310340314.5A CN202310340314A CN116218557A CN 116218557 A CN116218557 A CN 116218557A CN 202310340314 A CN202310340314 A CN 202310340314A CN 116218557 A CN116218557 A CN 116218557A
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- lignocellulose
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
- C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
- C10B57/06—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition containing additives
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
- C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
- C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
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Abstract
The invention discloses an adding method of lignocellulose carbon fixing agent, which comprises the following steps: step one, crushing a lignocellulose material into small blocks, and weighing a certain amount of small block lignocellulose material; step two, crushing the weighed small blocky lignocellulose materials into powdery lignocellulose materials according to the granularity of the carbon-fixing agent, wherein the granularity of the crushed powdery lignocellulose materials is equivalent to that of the carbon-fixing agent; uniformly mixing the powdery lignocellulose material with a carbon fixing agent to obtain carbon fixing mixed powder; and fourthly, uniformly spreading small blocky lignocellulose materials on the conveying belt to form a material layer, and uniformly spreading the carbon-fixing mixed powder on the material layer. The invention simply realizes the uniform mixing of trace high-efficiency carbon fixing agent and blocky lignocellulose materials, and utilizes the exothermic effect of the prior pyrolysis and carbonization of powdery lignocellulose to promote the pyrolysis and carbonization of blocky lignocellulose and reduce the energy consumption of the system.
Description
Technical Field
The invention belongs to the technical field of biomass pyrolysis, and particularly relates to an addition method of a lignocellulose carbon fixing agent.
Background
Biomass is considered as a renewable clean energy source which mainly supplements fossil fuel resources and improves ecological environment in the world currently, and is one of important development directions. Biomass pyrolysis carbonization technology converts biomass into biochar, fuel and chemicals. Biomass lignocellulose is mainly composed of cellulose, hemicellulose, lignin, etc. In general wood, cellulose accounts for 40-50%, and also 10-30% hemicellulose and 20-30% lignin. The biomass pyrolysis carbonization technology refers to a process of producing solid coke products by slowly decomposing and removing volatile matters of biomass under the condition of limited oxygen supply or complete oxygen deficiency. The ratio of biomass charcoal output can be improved by adopting a proper carbon fixing agent and a proper catalyst. Some of the high-efficiency carbon-fixing agents used at present are in powder form, the granularity is small, and the lignocellulose materials subjected to pyrolysis carbonization are generally only crushed into small blocks, so that great differences exist between the powder-form carbon-fixing agents and the small blocks of lignocellulose materials in terms of materials and particle sizes. The dosage of the high-efficiency carbon fixing agent in actual use is small, and the dosage of the high-efficiency carbon fixing agent is generally less than 5% of the lignocellulose material by mass. The conventional mixing mode has poor mixing effect and is not uniform enough because the gaps among the lignocellulose materials are far larger than the particle size of the carbon fixing agent. The adoption of the uniform spraying technology is limited by the fact that the doping amount of the carbon fixing agent is too small, and the trace carbon fixing agent is difficult to uniformly disperse on all lignocellulose materials.
Disclosure of Invention
The invention aims to provide an adding method of lignocellulose carbon-fixing agent, which is used for solving the technical problem that in the prior art, a small amount of powdery high-efficiency carbon-fixing agent is difficult to uniformly add into small-block lignocellulose materials.
The addition method of the lignocellulose carbon fixing agent comprises the following steps:
step one, crushing a lignocellulose material into small blocks, and weighing a certain amount of small block lignocellulose material;
step two, crushing the weighed small blocky lignocellulose materials into powdery lignocellulose materials according to the granularity of the carbon-fixing agent, wherein the granularity of the crushed powdery lignocellulose materials is equivalent to that of the carbon-fixing agent;
uniformly mixing the powdery lignocellulose material with a carbon fixing agent to obtain carbon fixing mixed powder;
and fourthly, uniformly spreading small blocky lignocellulose materials on the conveying belt to form a material layer, and uniformly spreading the carbon-fixing mixed powder on the material layer.
Preferably, in the first step, the mass ratio of the weighed small blocky lignocellulose material is not less than 10% of the lignocellulose material to be pyrolyzed.
Preferably, in the first step, the small pieces of lignocellulose material have a size of 3-5 mm.
Preferably, in the third step, the mass ratio of the powdery lignocellulose material to the carbon fixing agent is between 5:1 and 10:1.
Preferably, two powdery substances, namely the carbon fixing agent and the powdery lignocellulose material, are injected into a mixing bin in a convection way by adopting a gas conveying mode, and the feeding angles of the two powdery substances are different; and the bin is rotated by a stirring device to carry out secondary mixing of powdery substances.
Preferably, in the fourth step, the carbon-fixing mixed powder is stored in a mixing bin, a stick valve of the mixing bin is opened to start discharging, and uniform scattering is performed through a plurality of uniformly arranged powder discharging openings.
Preferably, the material layer is of a single-layer structure, and the carbon-fixing mixed powder is uniformly scattered on the surface of the small blocky lignocellulose material.
The invention has the advantages that: according to the invention, the powdery lignocellulose and the powdery carbon-fixing agent are doped in a certain proportion, so that the proportion of powdery materials can be increased, and the uniform scattering of trace amounts of the high-efficiency carbon-fixing agent on the massive materials can be easily realized, and the uniform mixing of the carbon-fixing agent and the massive materials can be realized. The powdery carbon fixing agent is added into the lignocellulose material in the mode, the powdery lignocellulose material and the blocky lignocellulose material are mixed and pyrolyzed during pyrolysis, and the powdery lignocellulose material is pyrolyzed and carbonized firstly due to different shapes and sizes of the powdery lignocellulose material and the blocky lignocellulose material and different pyrolysis temperature and speed, and can enter a carbonization stage at a lower temperature relative to the blocky lignocellulose material so as to release heat, and the exothermic reaction can accelerate the pyrolysis and carbonization of the blocky lignocellulose, reduce the energy consumption of a system and generate obvious promotion effect.
Drawings
Fig. 1 is a schematic flow chart of a method for adding a lignocellulose carbon fixing agent.
Detailed Description
The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate, and thorough understanding of the inventive concepts and aspects of the invention by those skilled in the art.
As shown in fig. 1, the invention provides a method for adding a lignocellulose carbon fixing agent, which comprises the following steps.
Step one, crushing the lignocellulose material into small blocks, and weighing a certain amount of small block lignocellulose material. The mass of the weighed small blocky lignocellulose material accounts for not less than 10% of the lignocellulose material to be pyrolyzed, and is usually not more than 20% of the lignocellulose material to be pyrolyzed.
And step two, further crushing the weighed small blocky lignocellulose materials according to the granularity of the carbon-fixing agent to obtain powdery lignocellulose materials serving as an intermediate carrier, wherein the granularity of the crushed powdery lignocellulose materials is equivalent to that of the carbon-fixing agent.
And step three, uniformly mixing the powdery lignocellulose material serving as the intermediate carrier with the carbon fixing agent to obtain carbon fixing mixed powder mixed with the intermediate carrier, wherein the mass ratio of the powdery lignocellulose material to the carbon fixing agent is 5:1-10:1.
Here, depending on the addition demand of the carbon fixing agent and the amount of the powdery lignocellulose material as an intermediate carrier, when the mixing ratio is not satisfied, the amount of the lignocellulose material crushed into small pieces of the intermediate carrier may be reduced or additionally increased. In the step, because the particle size of the mixed powdery lignocellulose material is equivalent to that of the carbon fixing agent, convection, shearing and repeated mixing can be formed between the two materials, so that the two materials are mixed more uniformly, and the problem of poor effect of mixing the carbon fixing agent due to overlarge gaps of the lignocellulose material is avoided. On the other hand, since the small pieces of lignocellulosic material previously broken into powder are only 10% to 20% of the total amount to be pyrolyzed, the expenditure of a great deal of time and energy for fine-grained breaking of the lignocellulosic material is avoided.
The method comprises the steps that two powdery substances, namely a carbon fixing agent and a powdery lignocellulose material, are injected into a mixing bin in a convection manner by adopting a gas conveying mode, and the feeding angles of the two powdery substances are different; and the bin is rotated by a stirring device to carry out secondary mixing of powdery substances.
And fourthly, uniformly spreading small blocky lignocellulose materials on the conveying belt to form a material layer, and uniformly spreading the carbon-fixing mixed powder on the material layer. The material layer is of a single-layer structure, and the carbon-fixing mixed powder is uniformly scattered on the surface of the small blocky lignocellulose material.
Taking phyllostachys pubescens as biomass raw material for pyrolysis and charcoal as an example, the raw material to be pyrolyzed in the embodiment is 1 ton phyllostachys pubescens, and a powdery carbonate is selected as a carbon fixing agent. In the first step, the batch of moso bamboos is crushed into small block materials with the size of 3-5mm, and then 100kg of the crushed block moso bamboos are weighed. The book is provided with
And in the second step, after detecting the granularity of the carbonate, fully crushing the small moso bamboos symmetrically taken according to the detected granularity, so that the granularity of the obtained bamboo powder is equivalent to that of the carbon fixing agent.
In the third step, the ratio of 10:1, mixing the bamboo powder and the carbonate carbon-fixing agent, introducing the mixture into a uniform mixing device, and stirring the mixture by a stirring device at 300r/min, so as to uniformly mix the bamboo powder and the carbonate carbon-fixing agent to form carbon-fixing mixed powder. This step achieves uniform mixing by means of a stirring and mixing device.
And step four, starting a conveying belt of the blocky moso bamboos, starting feeding the blocky moso bamboos, and uniformly spreading small moso bamboos on the conveying belt. And uniformly scattering carbon-fixing mixed powder on the moso bamboo layer paved by the small moso bamboos. The solid carbon mixed powder is stored in the mixing bin, the stick valve of the mixing bin is opened to start discharging, and uniform scattering is carried out through a plurality of uniformly arranged powder discharging openings.
Under the same thermal cracking condition, after the materials mixed by the bamboo powder and the carbonate carbon fixing agent are added, the pyrolysis temperature starting point of the blocky moso bamboo is reduced from 280 ℃ to about 260 ℃ to about 20 ℃, so that the pyrolysis condition is reduced, and meanwhile, the yield of the fixed carbon is increased by 20% in the same heat value of 5000-5500kcal/kg, so that the aim of high-efficiency pyrolysis carbon fixing is fulfilled.
While the invention has been described above with reference to the accompanying drawings, it will be apparent that the invention is not limited to the above embodiments, but is capable of being modified or applied to other applications without modification, as long as various insubstantial modifications of the inventive concept and technical solutions are adopted, all within the scope of the invention.
Claims (7)
1. The addition method of the lignocellulose carbon fixing agent is characterized by comprising the following steps of: comprises the following steps:
step one, crushing a lignocellulose material into small blocks, and weighing a certain amount of small block lignocellulose material;
step two, crushing the weighed small blocky lignocellulose materials into powdery lignocellulose materials according to the granularity of the carbon-fixing agent, wherein the granularity of the crushed powdery lignocellulose materials is equivalent to that of the carbon-fixing agent;
uniformly mixing the powdery lignocellulose material with a carbon fixing agent to obtain carbon fixing mixed powder;
and fourthly, uniformly spreading small blocky lignocellulose materials on the conveying belt to form a material layer, and uniformly spreading the carbon-fixing mixed powder on the material layer.
2. The method for adding a lignocellulose carbon fixing agent according to claim 1, wherein: in the first step, the mass ratio of the weighed small blocky lignocellulose material is not less than 10% of the lignocellulose material to be pyrolyzed.
3. The method for adding a lignocellulose carbon fixing agent according to claim 1, wherein: in the first step, the small blocky lignocellulose material is 3-5mm in size.
4. The method for adding a lignocellulose carbon fixing agent according to claim 1, wherein: in the third step, the mass ratio of the powdery lignocellulose material to the carbon fixing agent is between 5:1 and 10:1.
5. The method for adding a lignocellulose carbon fixing agent according to claim 1, wherein: the method comprises the steps that two powdery substances, namely a carbon fixing agent and a powdery lignocellulose material, are injected into a mixing bin in a convection manner by adopting a gas conveying mode, and the feeding angles of the two powdery substances are different; and the bin is rotated by a stirring device to carry out secondary mixing of powdery substances.
6. The method for adding a lignocellulose carbon fixing agent according to claim 1, wherein: in the fourth step, the carbon-fixing mixed powder is stored in a mixing bin, a stick valve of the mixing bin is opened to start discharging, and uniform sowing is performed through a plurality of uniformly arranged powder discharging openings.
7. The method for adding a lignocellulose carbon fixing agent according to claim 1, wherein: the material layer is of a single-layer structure, and the carbon-fixing mixed powder is uniformly scattered on the surface of the small blocky lignocellulose material.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022134608A1 (en) | 2022-12-22 | 2024-06-27 | Siempelkamp Maschinen- Und Anlagenbau Gmbh | Material plate and method for producing a material plate |
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Patent Citations (9)
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| US20100163395A1 (en) * | 2005-08-11 | 2010-07-01 | Forschungszentrum Karlsruhe Gmbh | Method for the rapid pyrolysis of lignocellulose |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102022134608A1 (en) | 2022-12-22 | 2024-06-27 | Siempelkamp Maschinen- Und Anlagenbau Gmbh | Material plate and method for producing a material plate |
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