A kind of equipment and method for producing oil by staged cocatalytic pyrolysis of agricultural and forestry waste and seaweed

Abstract

The invention belongs to the field of the biological energy utilization, and provides a device and a method for preparing oil by co-catalytically pyrolyzing forestry and agricultural wastes and algae in a sectional manner. The method comprises the following steps: mixing algae powder and forestry and agricultural waste powder to form a raw material, soaking HZSM-5 powder in a precursor solution containing gallium, and then soaking in a precursor salt solution containing nickel or silicon to obtain a composite catalyst; enabling carrier gas to enter from top of a heating section I; conveying the raw material to the heating section I by virtue of a spiral conveyor, enabling a non-condensed gas to rise to a projection section of the heating section I, placing the catalyst on a catalyst cushion layer of the projection section, after the pyrolysis is finished, turning an insert plate for 180 degrees, enabling the low-temperature product to fall into a heating section II, and enabling the carrier gas to enter from the bottom of the heating section II. A projection section at an outlet of the heating section II is provided with a cushion layer of self-made composite catalyst. The reaction residual coke is collected into a collection tank by virtue of an overturning stainless steel carrier net, and volatile components are collected into a liquid collector after being condensed. The low-oxygen high-quality biological oil is generated by utilizing the process, so that the conversion efficiency can be increased, and the carbon deposit deactivation of a molecular sieve can be effectively reduced.

Description

technical field [0001] The invention belongs to the field of bioenergy utilization, and mainly relates to a method and device for staged cocatalytic pyrolysis of biomass, in particular to equipment, method and device for producing oil by staged cocatalyzed pyrolysis of agricultural and forestry waste and seaweed. Background technique [0002] With the depletion of traditional fossil energy and the rapid growth of population and economy, biomass energy has gradually become the focus of research and utilization in countries all over the world. At present, the utilization of energy plants is mainly wood and crops. Using macroalgae to develop biodiesel and some alternative products of fossil energy is still a research hotspot and trend. As a biomass, macroalgae has the advantages of abundant reserves, rapid growth and reproduction, carbon neutrality in a short period of time, and no occupation of cultivated land. It is a high-quality alternative energy source. [0003] Pyrolys...

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Problems solved by technology

[0005] Although catalytic pyrolysis promotes the pyrolysis process to a certain extent and improves the pyrolysis efficiency, macroalgae exist in solid form for a long time during the pyrolysis process, so they cannot fully contact with the solid-state catalyst, and it is difficult to It has a catalytic effect, and the solid algae powder can easily block the active site of the catalyst, causing the catalyst to be deactivated

[0006] In addition, since seaweed has already started to pyrolyze at low temperature compared with terrestrial biomass, the melting point of seaweed ash is lower, which leads to the phenomenon that if seaweed and rice husk are co-pyrolyzed at high temperature at the same time, the seaweed will partially melt , resulting in the blockage of the material pores during the pyrolysis of the two

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