Device and method for jointly preparing bio-oil and multihole biochar through fuse salt by spraying biomass for pyrolysis

Abstract

The invention relates to the field of biomass resource utilization and provides a device and method for jointly preparing bio-oil and multihole biochar through fuse salt by spraying biomass for pyrolysis. Fuse salt with the high heat storage-heat transfer function is adopted as a heat carrier, a spraying mode is adopted to enable fuse salt to make complete contact with biomass to achieve quick pyrolysis, and fuse salt ions provide homogeneous catalysis or chemical reaction control for biomass pyrolysis. Fuse salt can store heat released in the reaction process and serves as a reaction medium so that chemical heat and external heat can be reasonably utilized. Pyrolytic carbon is continuously permeated and flushed through fuse salt to clear away tar blocking carbon gaps so that the gaps of the pyrolutic carbon can be open and unblocked, and multihole biochar with a certain adsorption capacity is formed. A bi-fuse salt spraying pyrolysis system is adopted. According to the method, the technical process is short, operation is easy and convenient, raw materials are fed in or discharged out through a pyrolysis basket, separation between pyrolysis carbon and fuse salt is easy, and finally bio-oil and biochar are jointly prepared through biomass pyrosis.

Description

technical field [0001] The invention relates to the field of utilization of biomass resources, in particular to a device and a method for jointly preparing bio-oil and bio-coke by spraying and pyrolyzing biomass with molten salt. Background technique [0002] With the depletion of traditional fossil energy and the increasingly serious environmental pollution caused by the use of fossil energy, biomass energy is a clean and renewable energy source with low sulfur, low nitrogen and "zero emission" of carbon dioxide. At the same time, biomass resources It has gradually attracted the attention and attention of researchers at home and abroad. [0003] Biomass pyrolysis is an efficient technology for converting biomass into pyrolysis oil, solid char and combustible gas. Energy saving of pyrolysis devices is essential. At present, biomass pyrolysis technology includes the use of indirect heating of reactors and direct heating of solid / gas heat-carrying pyrolysis processes. The he...

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Problems solved by technology

Due to the low density of biomass, it is difficult to immerse and fully contact the biomass in the molten salt liquid surface layer. At the same time, a large amount of gas explosion and bubbling occurs during the pyrolysis process of biomass, forming pressure that makes the pyrolysis gas drive the liquid surface of the molten salt layer to splash, resulting in melting It is difficult to control the salt pyrolysis process, and at the same time, the pyrolytic carbon formed during the pyrolysis process remains in the molten salt. Because the liquid surface of the molten salt wraps the charcoal, it is difficult to burn the charcoal in the molten salt. The separation of charcoal and molten salt limits the thermal treatment of biomass. application

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