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System and method for preparing bio-oil rich in levoglucosan

A levoglucosan and preparation system technology, applied in the field of biomass pyrolysis, can solve the problems of low content of levoglucosan in bio-oil, high energy consumption, loss of use value, etc., and achieve high output, fast heating rate, The effect of the simple preparation process

Active Publication Date: 2019-06-28
HUAZHONG UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because levoglucosan is unstable above 380°C, it is easy to continue to decompose into H 2 O.CO 2 , furan, furan, acetic acid and other low-molecular-weight products with low utilization value, so that the production efficiency of levoglucosan is low, and the content of levoglucosan in the prepared bio-oil is low, losing a large part of the value of use
On the other hand, the temperature required for pyrolysis is above 400°C, and it requires a lot of energy to maintain continuous pyrolysis

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The selected raw material is cellulose with a particle size of 25 microns. The heliostat field is composed of 24 flat glass mirrors of 30×38 cm. The diameter of the hyperboloid mirror is 1.5 m. The capacity of the screw feeder is about 50 g. The feeding speed is 1g / min. The solar fluidized bed pyrolysis reactor adopts a cylinder with an inner diameter of 22mm made of Amersil TO8 quartz tube, a wall thickness of 1.5mm, a capillary with a diameter of 1mm, and a branch at 24cm above it. The incident radiation flux per unit area ranges from 180-220W / cm 2 The reaction occurred, and several sets of experiments were carried out separately. The primary tar gas produced by pyrolysis was condensed and collected by the bio-oil classification condensation collection device. gas.

[0048] Table 1 Levoglucosan yield results

[0049] Incident radiant flux per unit area

[0050] According to the above data, considering economic factors, at 200W / cm 2 It is the most economic...

Embodiment 2

[0052] The incident radiation flux per unit area is 200W / cm 2 Under the same conditions, experiments were carried out with multiple groups of different feeding speeds: 0.2g / min, 0.5g / min, 1g / min, 1.5g / min, 2g / min, and the rest of the conditions were the same

[0053] Example 1, the yield of levoglucosan is shown in Table 2.

[0054] Table 2 Levoglucosan yield results

[0055] Feeding speed

Levoglucosan yield.

0.2g / min

29.8％

0.5g / min

30.6％

1g / min

31.2％

1.5g / min

29.2％

2g / min

27.8％

[0056] According to the above data, the incident radiation flux per unit area is 200W / cm 2 When the feed rate is 1g / min under the condition of , the yield of levoglucosan reaches 31.2%.

[0057] To sum up, the present invention utilizes the dual-temperature zone effect of concentrating solar energy, so that the pyrolysis product of cellulose, the primary tar, is immediately transferred from the high-temperature zone of the reactor...

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Abstract

The invention belongs to the biomass pyrolysis field and particularly discloses a system and method for preparing bio-oil rich in levoglucosan. The system comprises a heliostat field, a hyperboloid reflection mirror, a spiral feeder, a solar fluidized bed pyrolysis reactor, a biological oil grading, condensing and collecting device and a tail gas circular utilization device. By utilizing the system, the bio-oil rich in levoglucosan can be prepared by virtue of a concentrating solar power double-temperature region effect. Cellulose is pyrolyzed in a high-temperature region of the reactor so asto generate primary tar through the efficient utilization of heat produced by solar radiation, and the primary tar rapidly enters a low-temperature region, so that the secondary region is avoided; bycarrying out timed condensation and collection, the bio-oil rich in levoglucosan is obtained; and the system has the characteristics that the structure is compact, the operation process is simple, themaintenance cost of equipment is low, the utilization rate of solar power is high, the purity of levoglucosan in the prepared bio-oil is high, the quality of the bio-oil is good, and the like.

Description

technical field [0001] The invention belongs to the field of biomass pyrolysis, and more specifically relates to a system and method for preparing bio-oil rich in levoglucosan. Background technique [0002] Cellulose, as a widely distributed, pure and single substance in biomass, is very suitable for producing chemical products from it, and the main component of its pyrolyzed product is levoglucosan. As a derivative of glucose, levoglucosan has unique structure and chemical properties, and is widely used in industry. Its price is relatively expensive, about 378 yuan / g, so it has high commercial potential. For a long time, levoglucosan has been paid close attention to by people, and a variety of very valuable compounds can be synthesized through levoglucose, which can be used in various industries. For example, as a new sugar source, it can be used in the preparation of bio-based platform compounds and biotechnology fermentation, and can also be used to synthesize plant grow...

Claims

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Application Information

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IPC IPC(8): C10B53/02C10G1/00
CPCY02E50/10Y02P20/133
Inventor 曾阔梁泽路陈汉平杨海平刘晴川杨心怡丁智何肖宋杨
Owner HUAZHONG UNIV OF SCI & TECH
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