System and method for drying and carbonizing biomass raw material by using boiler flue gas

Abstract

The invention discloses a system and method method for drying and carbonizing a biomass raw material by using boiler flue gas. The invention relates to two processes of biomass drying as well as biomass carbonization and carbonization product utilization. In the process of biomass drying, the waste heat of rear flue gas of a boiler dust remover is used for drying the biomass raw material, so that the influence of the water content of the biomass raw material on a boiler system is avoided. In the process of biomass carbonization and carbonization product utilization, the heat of the flue gas at a boiler coal economizer is used for carrying out low-temperature pyrolysis carbonization treatment on the dried biomass so as to obtain biomass charcoals and a combustible pyrolysis gas with high heat values, high energy density and good hydrophobicity. By adopting the system and the method, the process of biomass drying and the process of carbonization are reasonably separated, the waste heat of the boiler flue gas is fully used, and the continuity of biomass drying and carbonization production is realized, so that the system and the method have the characteristics of wide raw material adaptability, high drying and carbonization efficiencies, stable carbonization product quality, convenience in operation, capability of scaling up easily and the like.

Description

technical field [0001] The invention relates to a system and method for drying and carbonizing biomass raw materials by using boiler flue gas, and belongs to the technical field of boiler flue gas waste heat utilization and biomass energy utilization. Background technique [0002] The extensive use of fossil energy (coal, oil, natural gas, etc.) not only depletes its resources, but also causes serious environmental pollution. Therefore, all countries in the world regard the development and utilization of renewable energy as an important part of the sustainable development of energy and the environment. . Biomass is an organic substance produced by plants through photosynthesis. Due to its abundant resource reserves, wide distribution, cleanness and zero CO 2 It is considered as an important renewable energy source due to its characteristics such as net emissions. It is estimated that the total amount of biomass generated by photosynthesis on the earth alone reaches 144-180...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of complex system and equipment structure, high energy consumption, and difficulty in large-scale continuous production in the existing biomass raw material drying and carbonization technology, and to provide a method for drying and carbonizing biomass using boiler flue gas. Raw Materials Systems and Methods

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