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A method for preparing bio-oil and soil conditioner by microwave-assisted catalytic fast pyrolysis sludge

A soil conditioner and microwave-assisted technology, applied in the field of biomass energy conversion, can solve the problems of reduction and non-discovery, and achieve the effect of simple process, good stability and rapid cracking

Active Publication Date: 2017-07-11
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with traditional heating, microwave heating has many advantages in biomass pyrolysis, but in the research process of microwave-assisted cracking sludge, no better selective catalyst has been found, which can improve the singleness of cracked bio-oil components and reduce cracking. Oxygen-containing and nitrogen-containing compounds in bio-oil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 500 g spherical silicon carbide (diameter 5 mm), 500 g HZSM-5 spherical catalyst (diameter 5 mm, Si / Al=20, specific surface area 380 m 2 / g) was added to a three-necked quartz bottle with mechanical stirring and a condenser, placed in a microwave pyrolysis instrument, the temperature was raised to 450 °C with a fixed power, mechanical stirring was performed at 60 r / min, and 500 g of dried and sieved sludge powder was gradually added. After 30 minutes of addition, continue to maintain catalytic cracking at 450°C without generating fractions. Microwave cracking yields 130 g of bio-oil and 271 g of solid residue (soil conditioner). GC-MS analysis shows that the content of aromatic hydrocarbons in the pyrolysis fuel reaches 60.7%.

Embodiment 2

[0020] 500 g spherical silicon carbide (diameter 10 mm), 1000 g HZSM-5 spherical catalyst (diameter 10 mm, Si / Al=30, specific surface area 405 m 2 / g) was added to a three-necked quartz bottle with mechanical stirring and a condenser, placed in a microwave pyrolysis instrument, the temperature was raised to 550 °C with a fixed power, mechanical stirring was performed at 60 r / min, and 500 g of dried and sieved sludge powder was gradually added. After 30 minutes of addition, continue to maintain catalytic cracking at 550°C and no fractions are formed. Microwave cracking yields 136 g of bio-oil and 268 g of solid residue (soil conditioner). GC-MS analysis shows that the content of aromatic hydrocarbons in the pyrolysis fuel reaches 61.8%.

Embodiment 3

[0022] 500 g spherical silicon carbide (diameter 10 mm), 500 g HZSM-5 spherical catalyst (diameter 10 mm, Si / Al=30, specific surface area 405 m 2 / g) was added to a three-necked quartz bottle with mechanical stirring and a condenser, placed in a microwave pyrolysis instrument, the temperature was raised to 450 °C with a fixed power, mechanical stirring was performed at 70 r / min, and 500 g of dried and sieved sludge powder was gradually added. After 30 minutes of addition, continue to maintain catalytic cracking at 450°C without generating fractions. Microwave cracking yields 141 g of bio-oil and 265 g of solid residue (soil conditioner). GC-MS analysis shows that the content of aromatic hydrocarbons in the pyrolysis fuel reaches 57.3%.

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Abstract

The invention relates to a method for quickly pyrolyzing sludge to prepare bio-oil and a soil improver by microwave assisted catalysis. The method comprises the following steps: (1) weighing silicon carbide spherical particles and a HZSM-5 spherical catalyst in a mass ratio of 1: 1 to 1: 2, and uniformly mixing and adding the mixture into a quartz reaction kettle; (2) putting the quartz reaction kettle in a microwave splitting instrument, heating the quartz reaction kettle to 450-600 DEG C, stirring the mixture at a rate of 60-100 r / minute, gradually adding dried sludge powder into the quartz reaction kettle and condensing the generated steam to obtain a brown liquid product bio-oil, and collecting solid residues as the soil improver. The method provided by the invention is simple in process and quick to split, and the obtained split fuel is high in hydrocarbon content which can reach over 55%. The obtained split fuel comprises important chemical raw materials such as naphthalene, p-xylene, 1,3,5-trimethylbenzene, 1-methylnaphthalene, indene and the like. The obtained solid residues are very high in content of P, Ca, K and Mg and can be used as the soil improver to improve the soil fertility.

Description

technical field [0001] The invention belongs to the technical field of biomass energy conversion. Background technique [0002] With the concern for environmental protection and the expansion of cities, sludge has become a crucial issue as how to effectively deal with the growing sewage. Sludge contains a large amount of heavy metals (such as As, Cd, Cr, Hg, Pb, Cu, Zn, Ni), viruses, pathogenic bacteria, insect eggs, and refractory toxic organic substances. The environment causes serious secondary pollution. Regarding the disposal of sludge, the governments of various countries clearly require to follow the principles of reduction, stabilization, resource utilization, and harmlessness. [0003] The use of pyrolysis technology to treat sewage sludge is an excellent process that can be used as a resource. It has attracted widespread attention and has broad development space. However, due to the complexity of the sludge composition, there are many oxygen-containing compounds...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00C10B53/00C02F11/10C09K17/00
CPCY02W10/40
Inventor 王允圃刘玉环阮榕生
Owner NANCHANG UNIV
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