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Method for reducing pyrolysis activation energy of rice hulls

A technology of activation energy and rice husk, applied in the fields of biofuels, special forms of dry distillation, coke ovens, etc., can solve the problem of less degree of pyrolysis, and achieve the effect of no processing, simplified catalytic steps, and easy to obtain.

Inactive Publication Date: 2014-12-03
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for reducing pyrolysis activation energy of rice hulls
  • Method for reducing pyrolysis activation energy of rice hulls
  • Method for reducing pyrolysis activation energy of rice hulls

Examples

Experimental program
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Embodiment 1

[0033] 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 alumina 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 .

[0034] From the comparison of the two figures, it can be seen that when the weight loss of pure rice husk reaches a stable level, the weight loss is about 59%-65%, and the temperature at this time is about 390°C, while the weight loss of rice husk catalyzed by alumina is about 59%-62%. , the lowest temperature is around 360°C. Experiments show that the addition of alumina can lower the pyrolysis temperature of rice husk, thereby reducing equipment requirements.

[0035] Use the Coats-Redfern method to calculate the activation energy before and...

Embodiment 2

[0038] Prepare rice husks with a particle size of ≤1 mm, dry them at 95°C for 16 hours, weigh 5.0 mg of rice husks and 2 mg of alumina 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 800℃, obtain the weight loss curve, and calculate the weight loss curve respectively.

Embodiment 3

[0040] 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 alumina 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 method for reducing pyrolysis activation energy of rice hulls, and belongs to the technical field of energy sources. The method comprises the following steps: selecting Wuyunjing No.7 rice hulls as an experimental raw material, respectively performing pyrolysis experiments on pure rice hulls and the rice hulls doped with a proper amount of aluminum oxide by using a non-isothermal method, and performing kinetic analysis on experimental data. The experiments and data analysis show that the pyrolytic reaction activation energy of the rice hulls can be reduced by doped aluminum oxide powder so as to ensure that the reaction can be implemented more easily; meanwhile, under the same pyrolysis degree, the reaction temperature is reduced, so that the equipment requirements can be reduced.

Description

technical field [0001] The invention relates to a method for reducing the pyrolysis activation energy of rice husk, 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...

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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