Biomass fast pyrolysis system and pyrolysis method

Abstract

Provided is a biomass fast pyrolysis system, pyrolysis gas produced from biomass pyrolysis is used as a heat carrier, makes direct contact with biomass in a pyrolysis furnace and is heated, and the biomass is pyrolyzed, wherein a part of the pyrolysis gas is used for burning to heat the heat carrier. The heat carrier has the same component as the pyrolysis gas, and a separation process is not needed to increase; with direct heating of the biomass by the heat carrier, the reaction rate can be greatly increased, the heat efficiency is improved, and high-efficiency utilization of the biomass is really achieved. The pyrolysis system is simple in structure and convenient and easy to use, and an indirect heating method of a traditional pyrolysis process is changed, the size of the pyrolysis furnace also can be greatly shrunk, the pyrolysis efficiency is greatly improved, the cost of investment is saved and the output rate is also increased.

Description

technical field [0001] The invention relates to the technical field of biomass pyrolysis, in particular to a rapid pyrolysis system and pyrolysis method using pyrolysis gas generated by biomass itself as a heat carrier and gas. Background technique [0002] With the rapid development of my country's economy and increasing energy consumption, the contradiction between resource shortage and energy consumption growth will become more prominent. Biomass energy is the renewable energy with the largest reserves on the earth. my country's biomass resources are very rich. Efficient conversion of biomass into high-grade clean energy is an effective way to solve energy shortage and environmental pollution. Biomass rapid pyrolysis refers to the process of rapidly raising the temperature of biomass to about 550 °C under the condition of no oxygen or limited oxygen to generate bio-oil, biochar and pyrolysis gas. Pyrolysis technology is the only technology that can directly convert biomas...

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Problems solved by technology

The former belongs to indirect heating, the heat source cannot be in direct contact with the material, and the pyrolysis efficiency is low; while the inner chamber of the indirect pyrolysis furnace is biomass material, and the outer layer is a heat carrier, the volume of the pyrolysis furnace increases accordingly; if the diameter of the inner chamber is too large, It requires more reaction time and higher temperature heat carrier, so it also limits the large-scale pyrolysis furnace

The latter is mixed with inert gas in the pyrolysis gas, its disadvantage is that the calorific value of the pyrolysis gas obtained after pyrolysis is low, and to increase the calorific value of the pyrolysis gas requires a separation process again, which increases the cost of separation and the cost of inert gas

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