Heat-storage type biomass pyrolysis method and system

Abstract

The invention provides a heat-storage type biomass pyrolysis method and system which can realize large-scale production and has low operation cost and low total energy consumption. The heat-storage type biomass pyrolysis method comprises the following steps: (1) pretreating the biomass: pretreating the raw materials of a biomass to obtain the raw materials which can be used for the pyrolysis of the biomass; (2) subjecting the biomass to pyrolysis: spreading the pretreated raw materials of the biomass on the rotating bottom of a heat-storage type gas radiating tube rotating bed uniformly, making the raw materials of the biomass heated gradually in a sealed spaced along with the rotating of the rotating bottom of a heat-storage type gas radiating tube rotating bed, keeping the raw materials of the biomass at the reaction temperature of 200-800 DEG C for 30-120 minutes, subjecting the raw materials of the biomass to reaction to produce the gaseous substance and the solid biological carbon; and (3) collecting and posttreating the products of pyrolysis; collecting the gaseous substance generated in the step (2), condensing, and separating the pyrolysis gas and the condensible liquid. The pyrolysis gas can be totally or partially used as the fuel of a heat-storage type gas radiating tube, and the discharged solid biological carbon is collected after being quenched and cooled.

Description

Technical field [0001] The invention relates to a biomass pyrolysis method and system, in particular to a thermal storage type biomass pyrolysis method and system. Background technique [0002] With the increasing demand for energy, the fuel as the main energy source is rapidly decreasing. According to forecasts by the U.S. Department of Energy and the World Energy Council, the recoverable life of global fuel coal, oil and natural gas is 211 years, 39 years and 60 years respectively. In addition, the use of a large amount of fossil fuels has led to global warming and increased SOx and NOx emissions, which seriously pollutes the atmospheric environment. Therefore, looking for a renewable and environmentally friendly energy source has become the focus of general attention in society. Among various renewable energy sources, biomass is unique. It can not only store solar energy, but is also a renewable carbon source that can be converted into conventional solid, liquid and gaseous ...

AI Technical Summary

Problems solved by technology

Fixed-bed biomass pyrolysis has the problem of uneven heating of the material layer and cannot be operated continuously. Although the fluidized bed can make the temperature inside the bed uniform, the processing scale is small, and the material particles are required to be small, and the pyrolysis gas and fluidization The gas is mixed together, increasing the process of separation of pyrolysis gas and fluidization gas

In addition, the traditional external heating method needs to consume a large amount of gas, and the operating cost is high

Other technologies under development include vacuum moving bed, induced flow bed, entrained flow, multi-furnace device, rotating cone and other biomass pyrolysis technologies. The common disadvantages are small processing scale and high energy consumption

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