CN112210413A - Preparation method of straw oxidation roasting carbon fuel - Google Patents
Preparation method of straw oxidation roasting carbon fuel Download PDFInfo
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- CN112210413A CN112210413A CN202010961013.0A CN202010961013A CN112210413A CN 112210413 A CN112210413 A CN 112210413A CN 202010961013 A CN202010961013 A CN 202010961013A CN 112210413 A CN112210413 A CN 112210413A
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- straw
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- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L5/00—Solid fuels
- C10L5/40—Solid fuels essentially based on materials of non-mineral origin
- C10L5/44—Solid fuels essentially based on materials of non-mineral origin on vegetable substances
- C10L5/447—Carbonized vegetable substances, e.g. charcoal, or produced by hydrothermal carbonization of biomass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Abstract
The invention discloses a preparation method of straw oxidation roasting carbon fuel, and belongs to the technical field of resource and energy utilization of agricultural biomass solid waste. The invention solves the problems of reducing the energy consumption and economic cost in the operation process and improving the fuel performance and operation efficiency on the premise of effectively realizing the resource and energy utilization of straw biomass wastes and producing solid fuels. The invention takes air as carrier gas in the roasting process, effectively reduces the energy input in the treatment process, and has the characteristics of low cost, simple operation, low equipment requirement, low energy consumption and the like. In addition, the method can realize the high-efficiency production of the high-quality straw biomass solid fuel, has the development potential of large-scale production and application, can effectively realize the conversion and utilization of agricultural biomass solid waste, improves the agricultural development current situation and the rural human environment, and promotes the rapid development of agricultural circular economy.
Description
Technical Field
The invention relates to a preparation method of straw oxidation roasting carbon fuel, and belongs to the technical field of resource and energy utilization of agricultural biomass solid waste.
Background
The biomass roasting technology is a thermochemical technology capable of effectively upgrading the performance of biomass fuel, has attracted extensive attention and studied deeply in the world in recent years, and becomes an emerging biomass resourceful treatment and disposal technology. The treatment conditions are generally limited to normal pressure and oxygen-free conditions. Compared with the original biomass, the solid product after roasting treatment has obviously improved fuel properties such as heat value, flammability, hydrophobicity, grindability, storage and transportation performance and the like. Because the anaerobic environment of the roasting process is maintained in the actual production operation, the treatment cost is increased, and in order to make the technology have practical significance and operability, the development of a new biomass roasting technology under the oxidizing atmosphere is necessary. Therefore, the invention provides a technology for producing solid biomass energy by roasting straw biomass under the air condition. In the roasting process under the air atmosphere, energy consumption reduction and carrier gas cost reduction in the roasting process can be realized due to the partial oxidation of the biomass, so that the operability and practical significance of energy utilization of the agricultural biomass solid waste are increased, the recycling efficiency of the biomass waste is improved, and the agricultural development current situation and the rural human living environment are improved.
Disclosure of Invention
The invention provides a preparation method of straw oxidation roasting carbon fuel, aiming at solving the problems of reducing energy consumption and economic cost in the operation process and improving fuel performance and operation efficiency on the premise of effectively realizing resource and energy utilization of straw biomass waste and producing solid fuel.
The technical scheme of the invention is as follows:
a preparation method of straw oxidation roasting carbon fuel comprises the following steps:
crushing straws, sieving the crushed straws with a 40-mesh sieve, and drying the crushed straws;
step two, placing the straws obtained after the treatment in the step one into a quartz tube of a tube furnace, and introducing air into the quartz tube to keep the air flow stable and create an oxidizing gas atmosphere;
and step three, roasting at the temperature of 200-300 ℃ for 10-60 min, stopping heating after roasting is finished, continuously keeping the introduction of air until the temperature in the quartz tube of the tube furnace is reduced to the room temperature, and taking out a solid product, namely the straw oxidizing and roasting carbon fuel.
Further, the specific operation process of drying in the step one is as follows: drying at 105 deg.C for 24 h.
Further, the air flow rate in the second step is 100-300 mL/min.
Furthermore, the flow rate of the air introduced in the third step is 100-300 mL/min.
Further, the third step is roasting for 15-60min at 200 ℃.
Further, step three is roasted at 250 ℃ for 60 min.
Further, the straw is corn straw and corncobs.
Further, the energy yield of the obtained straw oxidation roasting carbon fuel is more than 90%.
The invention has the following beneficial effects: the invention provides an improved method for preparing a straw roasted charcoal fuel, which can effectively realize the treatment of straw waste and the efficient production of biomass solid energy, and can also realize the reduction of energy consumption and economic cost in the treatment process. Compared with the prior art, the method uses the air as the carrier gas in the roasting process, uses the oxidative operation environment, can effectively reduce the energy input in the treatment process, has the characteristics of low cost, simple operation, low equipment requirement, low energy consumption and the like, and is more favorable for large-scale popularization and application. The invention provides a new idea and a new technical scheme for solving the problem of environmental pollution caused by open burning and random discarding of straws generated by excessive straw productivity and incapability of effective treatment in vast rural areas in China, plays an important role in agricultural modernization construction and rural human living environment improvement, is beneficial to adjusting and pulling employment of rural industrial structure and promoting rural economic development.
Detailed Description
The experimental procedures used in the following examples are conventional unless otherwise specified. The materials, reagents, methods and apparatus used, unless otherwise specified, are conventional in the art and are commercially available to those skilled in the art.
Example 1:
firstly, weighing 10g of straw biomass raw material sample, putting the straw biomass raw material sample into a ceramic boat, and putting the ceramic boat into a quartz tube of a tube furnace; opening an air pump, and introducing air into the quartz tube at a large flow rate, so as to create an oxidizing gas atmosphere; then adjusting a knob of the gas flowmeter, and keeping the flow rate of the carrier gas at 100 and 300mL/min to continuously introduce air;
and then, starting a heating device of the tube furnace, keeping the temperature for 15min after the roasting temperature rises to 200 ℃, stopping heating, continuously keeping the introduction of air until the temperature in the quartz tube of the tube furnace is reduced to the room temperature, and taking out a solid product, namely the straw oxidation roasting carbon fuel, which is recorded as an experimental group 1.
The differences between the experimental groups 2-6 and the experimental group 1 are that the roasting temperatures of the experimental groups 2, 3, 4, 5 and 6 are 225 ℃, 275 ℃, 200 ℃, 250 ℃ and 300 ℃, and the roasting time is 45min, 30min, 60min and 60 min.
The control group is straws dried in an oven at 105 ℃.
And (3) weighing the solid yield of each experimental group and the straws of the obtained straw oxidation roasting carbon fuel and the control group respectively, measuring element content and heat value, and calculating indexes such as solid yield, energy yield and the like. Three experiments were performed for each experimental group and the final results were averaged over the three experiments.
The biomass-calcined coke products obtained from the control group and the experimental groups were compared, and the results are shown in table 1.
TABLE 1 straw raw material and roasted product Property parameter Table
| Biomass sample | Calcination temperature (. degree.C.) | Treatment time (min) | Calorific value (MJ/kg) | Solid yield (%) | Energy yield (%) |
| Control group 1 | 0 | 0 | 17.1 | 100 | 100 |
| Experimental group 1 | 200 | 15 | 17.7 | 87.05 | 90.10 |
| Experimental group 2 | 225 | 45 | 20.7 | 55.33 | 66.98 |
| Experimental group 3 | 275 | 30 | 23.4 | 43.83 | 59.98 |
| Control group 2 | 0 | 0 | 18.0 | 100 | 100 |
| Experimental group 4 | 200 | 60 | 18.6 | 93.84 | 96.97 |
| Experimental group 5 | 250 | 60 | 25.4 | 59.52 | 83.85 |
| Experimental group 6 | 300 | 60 | 29.1 | 44.79 | 72.41 |
As can be seen from the above table, the energy yield of the straw biomass roasted charcoal is more than 90% at the roasting temperature of 200 ℃ and the roasting time of 15-60 min; when the roasting temperature is 250-300 ℃ and the roasting time is 60min, the heat value of the biomass roasted carbon can be greatly improved and approaches or reaches the heat value of the raw coal, and the raw coal can be used instead.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (8)
1. A preparation method of straw oxidation roasting carbon fuel is characterized by comprising the following steps:
crushing straws, sieving the crushed straws with a 40-mesh sieve, and drying the crushed straws;
step two, placing the straws obtained after the treatment in the step one into a quartz tube of a tube furnace, and introducing air into the quartz tube to keep the air flow stable and create an oxidizing gas atmosphere;
and step three, roasting at the temperature of 200-300 ℃ for 10-60 min, stopping heating after roasting is finished, continuously keeping the introduction of air until the temperature in the quartz tube of the tube furnace is reduced to the room temperature, and taking out a solid product, namely the straw oxidizing and roasting carbon fuel.
2. The method for preparing straw oxidation-roasting charcoal fuel according to claim 1, wherein the specific operation process of drying in the first step is as follows: drying at 105 deg.C for 24 h.
3. The method for preparing the straw oxidation-roasting charcoal fuel according to claim 1, wherein the air flow in the second step is 100-300 mL/min.
4. The preparation method of the straw oxidation-roasting charcoal fuel according to claim 1, wherein the flow rate of the air introduced in the third step is 100-300 mL/min.
5. The method for preparing straw oxidation-roasting charcoal fuel according to claim 1, wherein the third step is roasting at 200 ℃ for 15-60 min.
6. The method for preparing straw oxidation-roasting charcoal fuel according to claim 1, wherein the third step is roasting at 250 ℃ for 60 min.
7. The method for preparing straw oxidation-roasting charcoal fuel according to claim 1, wherein the straw is one or two of corn straw or corncob mixed in any proportion.
8. The method for preparing the straw oxidation-roasting charcoal fuel according to claim 1, wherein the energy yield of the straw oxidation-roasting charcoal fuel obtained by the method is more than 90%.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102786970A (en) * | 2012-09-06 | 2012-11-21 | 天津德塔生态炭发展有限公司 | Continuous and aerobic fast carbonization process of crop straws |
| CN103608436A (en) * | 2011-05-18 | 2014-02-26 | 拜奥恩德夫有限责任公司 | Method and an arrangement for efficient torrefaction of biomass |
| CN108395897A (en) * | 2018-04-13 | 2018-08-14 | 哈尔滨工业大学 | A kind of biomass roasting charcoal preparation method of the energy- and time-economizing adjusted based on carrier gas |
| CN110624504A (en) * | 2019-09-30 | 2019-12-31 | 河北大学 | Method for preparing biochar by carbonizing biological straw through low-temperature oxygen control |
-
2020
- 2020-09-14 CN CN202010961013.0A patent/CN112210413A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103608436A (en) * | 2011-05-18 | 2014-02-26 | 拜奥恩德夫有限责任公司 | Method and an arrangement for efficient torrefaction of biomass |
| US20140325900A1 (en) * | 2011-05-18 | 2014-11-06 | Bioendev Ab | Method and an arrangement for efficient torrefaction of biomass |
| CN102786970A (en) * | 2012-09-06 | 2012-11-21 | 天津德塔生态炭发展有限公司 | Continuous and aerobic fast carbonization process of crop straws |
| CN108395897A (en) * | 2018-04-13 | 2018-08-14 | 哈尔滨工业大学 | A kind of biomass roasting charcoal preparation method of the energy- and time-economizing adjusted based on carrier gas |
| CN110624504A (en) * | 2019-09-30 | 2019-12-31 | 河北大学 | Method for preparing biochar by carbonizing biological straw through low-temperature oxygen control |
Non-Patent Citations (5)
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| CONGYU ZHANG等: "Oxidative torrefaction of biomass nutshells: Evaluations of energy efficiency", 《APPLIED ENERGY》 * |
| KE-MIAO LU 等: "Torrefaction and low temperature carbonization of oil palm fiber and eucalyptus", 《BIORESOURCE TECHNOLOGY》 * |
| P. ROUSSET 等: "Biomass torrefaction under different oxygen concentrations and its effect on the", 《JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS》 * |
| WEI-HSIN CHEN 等: "Non-oxidative and oxidative torrefaction characterization and", 《APPLIED ENERGY》 * |
| 刘汝杰: "生物质有氧烘焙及燃烧特性研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
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Application publication date: 20210112 |