Method for preparing biomass molded coal

Abstract

The invention relates to a method for preparing biomass molded coal, which comprises: (a) crushing and sieving raw coal and biomass, and mixing and heating in a first mode of mixing raw coal and biomass and heating to a preset temperature or a second mode of heating the raw coal and biomass to a first temperature and a second temperature respectively, mixing and heating to the preset temperature; (b) performing pressing molding of the mixture of the raw coal and the biomass, which is obtained in the first mode or second mode, by using a mold under a forming pressure; and (c) cooling the molded coal and demolding to obtain the biomass molded coal. In the method, the biomass contains lignin, the preset temperature is a temperature at which the lignin in the biomass softens or liquefies, and the first temperature is lower than or equal to the second temperature. When the method is used for forming fuel, the high-strength biomass composite molded coal can be produced without using adhesive.

Description

technical field [0001] The invention belongs to the field of clean coal application, and more specifically relates to a biomass briquette, especially a binder-free biomass briquette and a preparation method thereof. Background technique [0002] my country is the second largest energy consumer in the world, and the primary energy is mainly coal. At present, my country's coal production and consumption account for more than 75% of the primary energy composition, becoming the world's largest coal producer and consumer. According to the characteristics of my country's energy resources and social and economic conditions, it can be predicted that for a long time in the future, my country will still be the main producer and consumer of coal. [0003] my country's coal reserves, resources and predicted resources total 5,569.7 billion tons, of which low-grade bituminous coal and lignite account for more than 50% of the coal reserves, and these coal resources are mostly distributed i...

AI Technical Summary

Problems solved by technology

[0013] However, there are certain problems in this method, that is, the production area of ​​weakly caking coal and non-caking coal such as low-rank bituminous coal or middle-aged lignite to be formed is high, and only weakly caking coal such as low-rank bituminous coal or middle-aged lignite and non-caking coal in specific areas Coal sticking can achieve the purpose of molding, such as low-rank bituminous coal or middle-aged and old lignite produced in the Hulunbuir area of ​​Inner Mongolia, but it is difficult to use the above-mentioned method for forming coal with low metamorphism in large quantities in Inner Mongolia, and the strength of the formed coal is not enough. Breaks easily during shipping and is not waterproof

[0014] Aiming at the current development status of biomass briquettes and the fact that the low metamorphism coal produced in Inner Mongolia is difficult to form independently, the inventors invented biomass briquettes with good water resistance and high compressive strength to solve the current problem of biomass briquettes. Coal and problems in its preparation

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