A method for preparing high-density biomass briquettes

Abstract

The invention relates to the technical field of biomass briquetting fuel and provides a preparation method of a high-density biomass briquetting fuel. The high-density biomass briquetting fuel is of a layered structure. The preparation method comprises the following steps: pretreating raw materials, adjusting the content of moisture in an inner-layer raw material, adjusting the content of moisture in an outer-layer raw material, laminating layer by layer and carrying out press molding. According to the high-density biomass briquetting fuel, the layered structure comprising an inner-layer raw material layer and an outer-layer raw material layer, by forming a gradient of fineness of raw materials between the inner-layer raw material layer and the outer-layer raw material layer, the pressing difficulty is decreased; by forming a gradient of a moisture content between the inner-layer raw material layer and the outer-layer raw material layer, the pressing difficulty is decreased and the density of the biomass briquetting fuel is ensured. The preparation method of the biomass briquetting fuel has the characteristics of high density and low cost, is convenient to process and can be put into scale production conveniently.

Description

technical field [0001] The invention relates to the field of biomass briquettes, in particular to a method for preparing high-density biomass briquettes. Background technique [0002] with the development of economy. Energy and environmental issues have become the focus of global attention. The energy crisis caused by the depletion of traditional fossil energy sources such as coal, oil, and natural gas and the pollution caused by their combustion have become increasingly prominent. It is imminent to develop clean and renewable energy sources. Biomass is a diverse energy resource with a wide range of sources and simple application. It has a good application prospect as an effective alternative energy source. In recent years, the research and application of using forest processing waste and straw to make biomass pellet fuel has gradually increased. At present, biomass energy is mainly directly formed into strips, granules or blocks by direct extrusion. , The molding thicknes...

AI Technical Summary

Problems solved by technology

However, in the current manufacturing process, it is generally improved by increasing the molding pressure, increasing the molding temperature, and improving the molding tools. However, these methods all belong to the improvement of the density of biomass briquettes from the perspective of external factors. This will result in huge equipment development costs, energy consumption costs and maintenance costs, resulting in a sharp increase in the cost of biomass briquettes, which is not conducive to its application and promotion

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