Method for preparing oil via pyrolysis of biomasses

Abstract

The invention discloses a method for preparing an oil via pyrolysis of biomasses. The method comprises the following steps: (1) smashing the biomasses taken as raw materials and drying; (2) drying quartz sand; (3) adding the quartz sand into a fluidized bed; (4) controlling the temperature of the fluidized bed, continuously blowing the fluidized bed by taking a preheated nitrogen gas or recycled gas as a carrier gas so as to form a non-oxygen atmosphere in the fluidized bed and controlling the pressure; (5) feeding the biomass particles into the fluidized bed through a spiral feeder by simultaneously feeding the nitrogen gas as a material-blowing wind so as to carry out a pyrolytic reaction to obtain the materials in a fluidized state; and (6) separating carbon residues from a product generated by a pyrolysis reaction through a cyclone separator and feeding the product into a condenser for condensation so as to obtain a biological oil and a non-condensable gas, wherein combusting one part of non-condensable gas by using a gas combustor so as to heat the fluidized bed and a preheater and taking the other part of non-condensable gas as the recycled gas. The method can be used for treating all agricultural wastes and has a high biological oil yield; and the non-condensable gas taken as a by-product can be recycled. In addition, the discharge of waste residues, waste water and waste gas is avoided.

Description

technical field [0001] The invention belongs to the technical field of energy utilization of biomass resources, and in particular relates to a method for converting agricultural waste biomass resources such as straw, rice husk, bagasse and the like into bio-oil through a rapid pyrolysis method. Background technique [0002] In today's society, with the expansion of population and the acceleration of industrialization, there is a huge demand for energy, resulting in the large-scale exploitation and utilization of fossil energy, which leads to the weakening and degradation of fossil energy, and also causes serious environmental pollution. The harmonious balance with nature has been greatly damaged, threatening the healthy development of economy and society. Therefore, under the circumstances of the gradual depletion of fossil energy, increasing environmental pressure, rising oil demand and intensified competition for world energy, countries all over the world are seeking and d...

AI Technical Summary

Problems solved by technology

As for oil production reactors, existing literature shows that domestic and foreign researchers have developed and utilized reactors including fixed bed reactors, fluidized bed reactors, rotating cone reactors, ablation reactors, downtube reactors, parallel reactors, etc. Tubular reactors, rotary kiln reactors, etc., these reactors can be used to produce bio-oil, but due to the different manufacturing structures, feeding methods, heat transfer methods, heating methods and reaction parameters to be controlled of each reactor, resulting in It has hard technical defects such as inability to continuously feed materials, rapid heating of raw materials, and inability to quickly export high-temperature oil and gas generated by pyrolysis, which affects its oil production performance; gas-solid separation devices usually use cyclone separators to separate pyrolysis gas and Carbon residue; condensing equipment is used to collect bio-oil, whether its design achieves the effect of quenching will directly affect the yield of bio-oil

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