CN104194807A - Novel method for using magnesium oxide - Google Patents
Novel method for using magnesium oxide Download PDFInfo
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- CN104194807A CN104194807A CN201410389870.2A CN201410389870A CN104194807A CN 104194807 A CN104194807 A CN 104194807A CN 201410389870 A CN201410389870 A CN 201410389870A CN 104194807 A CN104194807 A CN 104194807A
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- magnesium oxide
- rice husk
- pyrolysis
- oxide powder
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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 a novel method for using magnesium oxide, belonging to the technical field of energy. The novel method comprises the following steps: by adopting wuyunjing No.7 rice husk as an experiment raw material, performing pyrolysis experiment by using a differential thermal balance at the heating velocities of 5 DEG C/minute, 10 DEG C/minute, 15 DEG C/minute and 20 DEG C/minute respectively, confirming mechanism function by using a Malek method, and calculating the activation energy by using a Coats-Redfern method, wherein the activation energy is 84.24kJ/mol. A proper amount of magnesium oxide powder is doped into the rice husk, the experiment is made by using same pyrolysis conditions and analysis methods, and the pyrolysis activation energy is 75.39KJ/mol after magnesium oxide is used for catalyzing. The result of experiment shows that due to catalysis of magnesium oxide, the pyrolysis activation energy of the rice husk is reduced by about 10.4%, so that sufficient pyrolysis is achieved.
Description
Technical field
The present invention relates to one and utilize magnesian novel method, belong to energy technology field.
Background technology
Rice husk is one of important agricultural wastes, only China's output of 4,000 ten thousand tons of just having an appointment every year.As the reproducible biomass resource of one, rice husk is typically used as fuel and directly burns so that heat to be provided, but utilizes grade relatively low.Pyrolysis is one of hot spot technology of current biomass research, by pyrolysis, rice husk can be converted into high-grade combustible gas and easily storage, transport and the high tar of energy density, and the industrial gac being in great demand and the soft silica with high added value.
Pyrolysis refers in the situation that there is no the participation of oxygen-containing gas medium, thereby the simple heat of utilizing makes the organism generation decomposition in biomass remove volatile matter, and forms the process of solid-state semicoke or coke.Pyrolysis product comprises three kinds of gas, liquid and solids, and wherein gas can directly be used as fuel; Liquid can pass through further separation and extraction fuel made oil and industrial chemicals; Solid can be used as the required gac of Chemical Manufacture etc.
The interior conditions such as the external conditionss such as temperature of reaction, temperature rise rate and gas residence time and biomass chemical composition, size and heat conductivility all can exert an influence to ultimate yield, component and the proportion of biomass pyrolytic characteristic and each phase product, China grasps the fundamental characteristics of rice husk thermal decomposition at present substantially, but also relatively less for the research that how to improve degree of pyrolysis, the catalyzer that therefore preparation has a catalyse pyrolysis effect is the emphasis of Study on Pyrolysis.
Summary of the invention
The object of this invention is to provide one and utilize magnesian novel method.Choose No. 7 rice husks of military fortune round-grained rice as experimental raw, utilize differential thermal balance under 5 DEG C/min, 10 DEG C/min, 15 DEG C/min, the temperature rise rate of 20 DEG C/min, it to be carried out to Pyrolysis Experiment respectively, utilize Malek method to determine mechanism function, utilize Coats-Redfern method to calculate its activation energy for 84.24kJ/mol.In rice husk, mix appropriate magnesium oxide powder, test with identical pyrolytical condition and analytical procedure, the pyrolysis activation energy obtaining after magnesium oxide catalysis is 75.39KJ/mol.Experiment obtains by magnesian catalysis, and the activation energy of rice husk thermal decomposition has reduced by 10.4% left and right, is conducive to fully carrying out of pyrolysis.
Realizing technical scheme of the present invention is:
One is utilized magnesian novel method, and described catalyzer is magnesium oxide powder, and particle diameter is >=100 orders.Experiment material is No. 7 rice husks of military fortune round-grained rice, utilizes pulverizer to be ground into particle diameter≤1mm, dry 24h at 105 DEG C.Experiment is carried out under permanent differential thermal balance.
In the present invention, cross and add the catalyse pyrolysis of magnesium oxide powder for rice husk, concrete steps are as follows:
1) rice husk is pulverized, and in loft drier, dry obtaining is dried base, filters out magnesium oxide powder simultaneously;
2) rice husk and magnesium oxide powder are mixed, and stir;
3) respectively the rice husk before and after catalysis is carried out to Pyrolysis Experiment research, and experimental data is analyzed.
Step 1) in, rice husk powder particle diameter is≤1mm, and drying temperature is 95-105 DEG C, and be 16-24h time of drying; Magnesium oxide powder particle diameter >=100 order.
Step 2) in, the quality of magnesium oxide powder accounts for the 10%-20% of rice husk quality.
Step 3) in, experiment research is non-isothermal method, respectively with 5 DEG C/min, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min heated sample to 700-1000 DEG C; Calculating catalysis front and back rate of weight loss, weight loss rate and activation energy changes.
Interpretation method is Coats-Redfern method.
Compared with prior art, its remarkable advantage is in the present invention:
(1) magnesium oxide is comparatively cheap as catalyzer, thereby catalysis cost is lower.
(2) magnesium oxide easily obtains, and without processing treatment, simplifies catalytic step.
(3) compared with conventional basic metal catalysis, magnesium oxide is comparatively stable, is applicable to recycled for multiple times.
Brief description of the drawings
Fig. 1 rice husk thermal decomposition TG curve.
Fig. 2 rice husk catalyse pyrolysis TG curve.
Ln[G (the α)/T of Fig. 3 rice husk
2]-1/RT linear relationship chart.
Ln[G (the α)/T of Fig. 4 rice husk catalysis
2]-1/RT linear relationship chart.
Embodiment
One is utilized magnesian novel method, and described catalyzer is magnesium oxide powder, and particle diameter is >=100 orders.Experiment material is No. 7 rice husks of military fortune round-grained rice, utilizes pulverizer to be ground into particle diameter≤1mm, dry 24h at 105 DEG C.Experiment is carried out under permanent differential thermal balance.
In the present invention, cross and add the catalyse pyrolysis of magnesium oxide powder for rice husk, concrete steps are as follows:
1) rice husk is pulverized, and in loft drier, dry obtaining is dried base, filters out magnesium oxide powder simultaneously;
2) rice husk and magnesium oxide powder are mixed, and stir;
3) respectively the rice husk before and after catalysis is carried out to Pyrolysis Experiment research, and experimental data is analyzed.
Step 1) in, rice husk powder particle diameter is≤1mm, and drying temperature is 95-105 DEG C, and be 16-24h time of drying; Magnesium oxide powder particle diameter >=100 order.
Step 2) in, the quality of magnesium oxide powder accounts for the 10%-20% of rice husk quality.
Step 3) in, experiment research is non-isothermal method, respectively with 5 DEG C/min, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min heated sample to 700-1000 DEG C; Calculating catalysis front and back rate of weight loss, weight loss rate and activation energy changes.
Interpretation method is Coats-Redfern method.
Below in conjunction with drawings and Examples, the present invention is described in further detail.
Embodiment 1
Produce the rice husk of particle diameter≤1mm, at 105 DEG C, be dried, be 24h time of drying, take 5.0mg rice husk and 1mg magnesium oxide powder, after fully mixing, add in differential thermal balance, utilize non-isothermal method respectively with 5 DEG C/min, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min heated sample to 1000 DEG C, obtain weight-loss curve, and obtain respectively weight-loss curve curve, as Fig. 1 and Fig. 2.
More known by two figure, in the time that temperature reaches 390 DEG C, the weightlessness of pure rice husk is about about 60%-65%, and the weightlessness of rice husk that adds magnesium oxide catalysis is about 53%-58% left and right, and description of test adds magnesium oxide can make rice husk thermal decomposition more thorough.
Utilize Coats-Redfern method to calculate the activation energy of catalysis front and back, its integrated form is ln[G (α)/T
2]=ln[(AR)/(Β E)]-E/ (RT), makes ln[G (α)/T
2]-1/RT relation curve, as Fig. 3 and Fig. 4, its slope is activation energy.
According to calculating, the activation energy 84.24KJ/mol of rice husk thermal decomposition, the activation energy that adds the rice husk thermal decomposition of magnesium oxide catalysis is 75.43KJ/mol.Experiment draws by adding magnesian catalysis, makes the activation energy of rice husk thermal decomposition reduce by 10.4% left and right, makes reaction be more prone to occur, and is conducive to industrial scale operation.
Embodiment 2
Produce the rice husk of particle diameter≤1mm, at 95 DEG C, be dried, be 16h time of drying, take 5.0mg rice husk and 2mg magnesium oxide powder, after fully mixing, add in differential thermal balance, utilize non-isothermal method respectively with 5 DEG C/min, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min heated sample to 800 DEG C, obtain weight-loss curve, and obtain respectively weight-loss curve curve.
Embodiment 3
Produce the rice husk of particle diameter≤1mm, at 100 DEG C, be dried, be 20h time of drying, take 5.0mg rice husk and 1.5mg magnesium oxide powder, after fully mixing, add in differential thermal balance, utilize non-isothermal method respectively with 5 DEG C/min, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min heated sample to 900 DEG C, obtain weight-loss curve, and obtain respectively weight-loss curve curve.
Claims (5)
1. utilize a magnesian novel method, it is characterized in that, by adding the catalyse pyrolysis of magnesium oxide powder for rice husk, concrete steps are as follows:
1) rice husk is pulverized, and in loft drier, dry obtaining is dried base, filters out magnesium oxide powder simultaneously;
2) rice husk and magnesium oxide powder are mixed, and stir;
3) respectively the rice husk before and after catalysis is carried out to Pyrolysis Experiment research, and experimental data is analyzed.
2. one according to claim 1 is utilized magnesian novel method, it is characterized in that step 1) in, rice husk powder particle diameter is≤1mm, and drying temperature is 95-105 DEG C, and be 16-24h time of drying; Magnesium oxide powder particle diameter >=100 order.
3. one according to claim 1 is utilized magnesian novel method, it is characterized in that step 2) in, the quality of magnesium oxide powder accounts for the 10%-20% of rice husk quality.
4. one according to claim 1 is utilized magnesian novel method, it is characterized in that step 3) in, experiment research is non-isothermal method, respectively with 5 DEG C/min, 10 DEG C/min, 15 DEG C/min, 20 DEG C/min heated sample to 700-1000 DEG C; Calculating catalysis front and back rate of weight loss, weight loss rate and activation energy changes.
5. one according to claim 4 is utilized magnesian novel method, it is characterized in that, interpretation method is Coats-Redfern method.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108985006A (en) * | 2018-08-03 | 2018-12-11 | 中国科学技术大学 | Pyrolysis Kinetics Parameter and mechanism function acquisition methods under multiple heating mode |
| CN111312337A (en) * | 2020-01-17 | 2020-06-19 | 中国地质大学（武汉） | Method for determining unimodal combustible pyrolysis reaction mechanism model based on thermogravimetric experiment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575527A (en) * | 2009-06-23 | 2009-11-11 | 北京永源新业设备有限公司 | Biomass direct thermal cracking generator and cracking method thereof |
| CN102031131A (en) * | 2010-12-20 | 2011-04-27 | 河南中埠新能源有限公司 | Pyrolytic process and device capable of directly transforming straws into petrol and diesel |
| CN103084158A (en) * | 2011-11-07 | 2013-05-08 | 北京低碳清洁能源研究所 | Adsorption catalysis heat carrier for biomass pyrolysis |
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2014
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101575527A (en) * | 2009-06-23 | 2009-11-11 | 北京永源新业设备有限公司 | Biomass direct thermal cracking generator and cracking method thereof |
| CN102031131A (en) * | 2010-12-20 | 2011-04-27 | 河南中埠新能源有限公司 | Pyrolytic process and device capable of directly transforming straws into petrol and diesel |
| CN103084158A (en) * | 2011-11-07 | 2013-05-08 | 北京低碳清洁能源研究所 | Adsorption catalysis heat carrier for biomass pyrolysis |
Non-Patent Citations (1)
| Title |
|---|
| 卢红伟: "生物质催化热解实验研究", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108985006A (en) * | 2018-08-03 | 2018-12-11 | 中国科学技术大学 | Pyrolysis Kinetics Parameter and mechanism function acquisition methods under multiple heating mode |
| CN111312337A (en) * | 2020-01-17 | 2020-06-19 | 中国地质大学（武汉） | Method for determining unimodal combustible pyrolysis reaction mechanism model based on thermogravimetric experiment |
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Application publication date: 20141210 |