Solar cooperative two-step biomass spiral baking pretreatment method and apparatus thereof

Abstract

The invention provides a solar cooperative two-step biomass spiral baking pretreatment method and an apparatus thereof. The method comprises the following steps: carrying out drying dehydration on biomasses by using solar energy as an auxiliary heat source and cooperating with baking volatile matter combustion; preheating a biomass spiral baking reactor by using conventional energy, sending the dehydrated biomasses into the biomass spiral baking reactor, carrying out a baking reaction, stopping the convectional energy when the baking volatile matters are ignited, mixing the baking volatile matter with air to combust, blending high-temperature hot smoke generated during the combustion with the air to reach a preset temperature biomass, providing heat for the baking reaction, carrying out heat exchange on the heat-exchanged medium-temperature smoke and air, completely discharging the smoke, and carrying out drying dehydration on the biomasses by the heated air. The baking process is divided into drying dehydration and low-temperature pyrolysis, the biomasses are dried to remove water, the specific heat capacity of the material is reduced to facilitate material heating and precipitation of the baking volatile matter, and the solar energy is combined to realize biomass baking pretreatment customized production with wide biomass material adaptability.

Description

technical field [0001] The present invention relates to the field of biomass energy, more specifically, to a method and device for pretreatment of biomass spiral roasting with solar energy synergy two-step method. Background technique [0002] The development of the global economy, the growth of population and the improvement of living standards have resulted in a sharp increase in energy demand. At the same time, it has also led to the depletion of conventional energy and the increasingly serious environmental pollution. Biomass energy is the largest renewable energy and the only renewable carbon source. Its effective use can replace conventional energy, alleviate pollution and reduce greenhouse gas emissions. Through technologies such as combustion, gasification, pyrolysis, anaerobic fermentation, transesterification and compact molding, biomass can be converted into heat and gas, bio-oil and charcoal three-phase products and solid particle fuels, as energy, chemical and e...

AI Technical Summary

Problems solved by technology

[0007] The presence of moisture in biomass increases its specific heat capacity, prolongs the residence time of biomass in the torrefaction reactor, and reduces production efficiency. In addition, the evaporation of water in the initial stage of torrefaction takes place first, forming a certain The partial pressure interferes with the precipitation of roasted volatiles of the three components of hemicellulose, cellulose and lignin, which affects the process of the roasting reaction and the quality of the product

Biomass roasting by low-temperature pyrolysis is an endothermic reaction. The heat source generally comes from the combustion of its own volatiles and supplemented by a small amount of external heat source. It is affected by the type of raw material and the initial moisture content of the raw material. To obtain an ideal roasted product, When the moisture content is high or the microstructure of the biomass is dense, it will rely on more external heat input or increase the roasting depth. The former means an increase in cost, while the latter is often difficult to guarantee the quality of roasted products

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