Method for simultaneously reducing the contents of high-ring, middle-ring and low-ring PAHs in biomass pyrolysis oil

Abstract

The inventions discloses a method for simultaneously reducing the contents of high-ring, middle-ring and low-ring PAHs in biomass pyrolysis oil. The method includes pyrolyzing biomass or mixture of biomass and zeolite molecular sieves at a mass ratio of 0.5 to 2:1 at the temperature of 450-550 DEG C by using mixed gas of N2 and CO2 as the pyrolysis atmosphere, thereby reducing the contents of high-ring, middle-ring and low-ring PAHs in the biomass pyrolysis oil simultaneously. According to the method, biomass or mixture of biomass and zeolite molecular sieves is pyrolyzed by introducing a certain amount of CO2 gas into the pyrolysis atmosphere, that is, using the mixed gas of N2 and CO2 as the pyrolysis atmosphere, thereby achieving the effect of restraining the PAHs generation of biomassin the process of pyrolysis, significantly reducing the contents of high-ring, middle-ring and low-ring PAHs in the biomass pyrolysis oil, and reducing the environmental health risks in subsequent application processes such as storage and transportation of pyrolysis oil.

Description

technical field [0001] The invention belongs to the technical field of biomass energy, and more specifically relates to a method for synchronously reducing the content of high-ring, middle-ring and low-ring PAHs in biomass pyrolysis oil. Background technique [0002] The non-renewability of coal, petroleum and other fossil energy seriously restricts the rapid, healthy and sustainable development of my country's economy. Biomass is a cheap and easy-to-obtain renewable energy, which has the potential to replace fossil fuels. Therefore, countries all over the world have paid great attention to the development and utilization of biomass. Biomass is an organism formed directly or indirectly through photosynthesis, generally composed of cellulose, hemicellulose, lignin and other components. Biomass pyrolysis, that is, the thermal degradation of biomass in the absence of oxygen or oxygen, often using inert gas N 2 As a reaction atmosphere, the products are coke, synthesis gas and...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the deficiency in the prior art that the content of PAHs with different toxicity in the pyrolysis oil cannot be controlled while ensuring the effective transformation of biomass, and to provide a kind of synchronous reduction of biomass pyrolysis oil Method for middle-high ring, middle ring and low ring PAHs content

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