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A method for preparing bio-oil by pyrolysis of biomass

A biomass pyrolysis and bio-oil technology, which is applied in the preparation of liquid hydrocarbon mixtures, petroleum industry, etc., can solve the problem of high acidity of bio-oil, reduce side reactions, improve the quality of bio-oil, and the method is simple and effective.

Active Publication Date: 2016-03-02
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method can create an alkaline environment in the pyrolysis system, realize the two-phase separation of bio-oil, solve the problem of high acidity of bio-oil, facilitate the subsequent treatment of bio-oil, and promote the wider application of bio-oil

Method used

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  • A method for preparing bio-oil by pyrolysis of biomass
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  • A method for preparing bio-oil by pyrolysis of biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The ammonia in the alkaline gas cylinder 3 and the nitrogen in the nitrogen cylinder 4 pass through the flowmeter 5 and enter the gas mixer 6 in a ratio of 1:9 to form a mixed alkaline carrier gas, which passes through the mass flowmeter 7 and then passes into the preheater 8 is preheated, and then enters the pyrolysis reactor 9 so that the reactor forms an alkaline gas atmosphere. Take 1kg of Chinese fir (0.5-3.2mm) and place it in the feeding bin 1, and send it into the pyrolysis reactor 9 by the automatic feeding device 2 to carry out the pyrolysis reaction. The residence time is 1.2s, and the reaction temperature is about 500°C. The pyrolysis steam passes through two cyclone separators 10 and 12, and the solid carbon is separated and collected in the biochar collection tanks 11 and 13. The pyrolysis steam enters the quenching tower 16, and the primary bio-oil obtained by spray cooling is temporarily stored at the bottom of the tower. Storage tank 17, then most of th...

Embodiment 2

[0033] Similar to Example 1, using Chinese fir (0.5-3.2mm) as raw material, mix ammonia and nitrogen in a ratio of 3:7 to form a mixed alkaline carrier gas for reaction, the residence time is 0.5s, and the reaction temperature is about 550°C . The bio-oil yield rate is 42.63%, and the obtained primary bio-oil accounts for 65%-80% of the bio-oil yield, the water phase part of the primary bio-oil accounts for about 35% of the primary bio-oil, and the water content is 40.05wt%. The pH value is 9.64; the oil phase accounts for about 65%, the water content is 15.80%, and the calorific value is 22.780MJ / kg. The GC-MS analysis results of the primary bio-oil are shown in Table 2.

[0034] Table 2 GC-MS analysis of primary bio-oil

[0035]

Embodiment 3

[0037] Similar to Example 1, Chinese fir (0.5-3.2mm) was used as raw material, ammonia and nitrogen were mixed in a ratio of 1:9 to form a mixed alkaline carrier gas for reaction, the residence time was 3s, and the reaction temperature was about 400°C. The bio-oil yield rate is 45.19%, and the obtained primary bio-oil accounts for 65%-80% of the bio-oil yield, the water phase part of the primary bio-oil accounts for about 45% of the primary bio-oil, and the water content is 48.12wt%. The pH value is 10.68; the oil phase accounts for about 55%, the water content is 20.27%, and the calorific value is 20.610MJ / kg. The GC-MS analysis results of the primary bio-oil are shown in Table 3.

[0038] Table 3 GC-MS analysis of primary bio-oil

[0039]

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Abstract

The invention relates to a method for preparing bio-oil through biomass, in particular to a method for preparing bio-oil through biomass pyrolysis. The method comprises the steps that biomass is smashed, and biomass particles are screened, dried and then placed in a feeding bin; a preparing system is blown through nitrogen, air in the system is removed, nitrogen is fed, a reactor is preheated, and alkaline carrier gas which is preheated through a preheater is fed; the biomass particles in the feeding bin are fed into a pyrolysis reactor for pyrolysis, and pyrolysis steam is obtained; gas-solid separation is conducted on the pyrolysis steam, biochar, and ash in a separator, biochar is obtained, and the biochar can be used as a fuel or a soil conditioner; spraying cooling is conducted on the pyrolysis steam in a chilling tower through a spraying medium, first-level bio-oil is obtained, the bio-oil stands for separation, the upper layer is a water phase, and the lower layer is an oil phase; the pyrolysis steam is condensed in a water cooling condenser, and second-level bio-oil is obtained; the pyrolysis steam is condensed in an ice-cooling condenser, third-level bio-oil is obtained, and non-condensable gas is led out, collected and are used as fuel gas or carrier gas to be recycled.

Description

technical field [0001] The invention relates to a method for preparing bio-oil from biomass, in particular to a method for preparing bio-oil by pyrolyzing biomass. Background technique [0002] With the continuous exploitation and use of fossil energy, fossil energy will be increasingly depleted worldwide. At the same time, in order to mitigate the threat of global warming, it is imperative to utilize and develop renewable energy to partially replace fossil energy. Biomass has always been an important energy source for human survival, and it is also the only renewable energy source that can be converted into liquid fuel. It is the fourth energy source in the world's total energy consumption after coal, oil and natural gas. play an important role in the entire energy system. Biomass pyrolysis is an important aspect of biomass energy application technology. It rapidly heats biomass to a certain temperature through high temperature in an oxygen-free or anoxic environment, dec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00
Inventor 刘运权朱沈嘉王夺叶跃元
Owner XIAMEN UNIV
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