Novel method for using magnesium oxide

A magnesium oxide and new method technology, applied in the direction of biofuel, special carbonization, coke oven, etc., can solve the problem of low pyrolysis degree, etc., and achieve the effect of no processing, simplified catalytic steps, and easy access

Inactive Publication Date: 2014-12-10
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0004] External conditions such as reaction temperature, heating rate, and gas residence time, as well as internal conditions such as biomass chemical composition, particle size, and thermal conductivity, will affect the pyrolysis characteristics of biomass and the final yield, composition, and specific gravity of each phase product. , my country has basically mastered the basic characteristics of rice husk pyrolysis, but there are relatively few studies on how to improve the degree of pyrolysis, so the preparation of catalysts with catalytic pyrolysis is the focus of pyrolysis research

Method used

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  • Novel method for using magnesium oxide
  • Novel method for using magnesium oxide
  • Novel method for using magnesium oxide

Examples

Experimental program
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Embodiment 1

[0035] Prepare rice husks with a particle size of ≤1 mm, dry them at 105°C for 24 hours, weigh 5.0 mg of rice husks and 1 mg of magnesium oxide powder, mix them thoroughly, add them to a differential thermal balance, and use the non-isothermal method to separate them for 5 ℃ / min, 10℃ / min, 15℃ / min, 20℃ / min heat the sample to 1000℃, obtain the weight loss curve, and calculate the weight loss curve respectively, such as figure 1 and figure 2 .

[0036] From the comparison of the two figures, it can be seen that when the temperature reaches 390°C, the weight loss of pure rice husk is about 60%-65%, while the weight loss of rice husk catalyzed by adding magnesium oxide is about 53%-58%. Magnesium can make rice husk pyrolysis more thorough.

[0037] Use the Coats-Redfern method to calculate the activation energy before and after catalysis, and its integral form is ln[G(α) / T 2 ]=ln[(AR) / (ΒE)]-E / (RT), make ln[G(α) / T 2 ]-1 / RT relationship curve, such as image 3 and Figure 4 , ...

Embodiment 2

[0040] Prepare rice husks with a particle size of ≤1 mm and dry them at 95°C for 16 hours. Weigh 5.0 mg of rice husks and 2 mg of magnesium oxide powder, mix them thoroughly and add them to a differential thermal balance. ℃ / min, 10℃ / min, 15℃ / min, 20℃ / min heat the sample to 800℃, obtain the weight loss curve, and calculate the weight loss curve respectively.

Embodiment 3

[0042] Prepare rice husks with a particle size of ≤1 mm, dry them at 100°C for 20 hours, weigh 5.0 mg of rice husks and 1.5 mg of magnesium oxide powder, mix them thoroughly, add them to a differential thermal balance, and use the non-isothermal method to separate Heat the sample at 5°C / min, 10°C / min, 15°C / min, 20°C / min to 900°C, obtain the weight loss curve, and calculate the weight loss curve respectively.

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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 [0001] The invention relates to a new method for utilizing magnesium oxide, which belongs to the technical field of energy. Background technique [0002] Rice husk is one of the important agricultural wastes, with an annual output of about 40 million tons in China alone. As a renewable biomass resource, rice husk is usually burned directly as fuel to provide heat, but the utilization grade is relatively low. Pyrolysis is one of the hot technologies in biomass research at present. Through pyrolysis, rice husk can be converted into high-grade combustible gas and tar which is easy to store and transport and has high energy density, as well as activated carbon and Amorphous silica with high added value. [0003] Pyrolysis refers to the process of decomposing organic matter in biomass by simply using heat without the participation of an oxygen-containing gas medium to remove volatile substances and form solid semi-coke or coke. Pyrolysis products include gas, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/02
CPCY02E50/10
Inventor 王文举张鹏
Owner NANJING UNIV OF SCI & TECH
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