Method for preparing firewood sticks by waste cassava residues and application on charcoal preparation

Abstract

The invention discloses a method for preparing firewood sticks by waste cassava residues and application on charcoal preparation. The method comprises the following steps of taking the waste cassava residues produced in the production process of cassava starch as raw materials, drying the waste cassava residues to obtain dried residues, and preparing the formed firewood sticks by the dried residues, wherein after the waste cassava residues are dried, the water content rate of the dried residues is controlled to range from 10% to 15%, and the temperature of a mold for preparing the formed firewood sticks by the dried residues is controlled to be 230-280 DEG C. The firewood sticks prepared by the method are further baked into charcoal products which have the advantages of low ash content, low sulphur content, charcoal content, high heat productivity and the like, and are high-quality biomass energy. By the method, the waste cassava residues can be subject to industrial processing to form three levels of products (the dried residues, the firewood sticks and charcoal), so that circulated economic ecological chain of 'cassava-starch-cassava residues-biomass energy' can be formed, simultaneously, the risk that the waste cassava residues pollute environments can be eliminated, the direct energy-saving benefit is obvious, and the indirect emission reduction economic benefit is remarkable.

Description

technical field [0001] The invention relates to the field of biomass energy utilization, in particular to a method for making fuel rods from cassava waste residues and its application in charcoal production. Background technique [0002] Cassava, a shrubby perennial crop, is widely cultivated in tropical regions of the world and its roots are edible. The products produced and processed from cassava mainly include alcohol, starch, modified starch, starch sugar, organic acid, etc. Among them, starch is the most basic and important processed product of cassava. [0003] The current cassava starch processing and production generally includes several main processes such as raw material processing, soaking, crushing, separation, cleaning, and drying. The entire production process has problems such as low comprehensive utilization, short industrial chain, and lagging behind in the development of refined products. In particular, a large amount of waste residue produced by cassava p...

AI Technical Summary

Problems solved by technology

[0011] Therefore, the water in cassava residues has the following characteristics: ① Due to the overlapping of starch granules, fibers and other substances, the necessary physical channels for drainage are blocked; It has a certain viscosity and its surface tension, which increases the drainage resistance; ③The capillary action between solid phase substances, especially the capillary action between fibers, also increases the drainage resistance; ④Protein and large Most of the colloidal substances are hydrophilic colloidal particles and the negative charges on the surface of the fibers and the positive charges in the water attract each other. The force between these molecules or ions makes the separation of solid and liquid more difficult; ⑤Because the fibers have a strong "reabsorption" phenomenon (that is, the dehydrated fiber can reabsorb and expand when it meets water), and there are many kinds of compressible substances in the potato residue, such as fibers, etc., so the volume changes often occur when the external force is applied, resulting in the tiny drainage channels becoming more compact. If it is small or clogged, it will also make it difficult to fully dehydrate the potato dregs

[0012] Since cassava residue has the composition and structural characteristics of the above analysis, it is a heat-sensitive material, and the initial moisture content is high. The problem of difficult dehydration has always plagued the comprehensive development and utilization of cassava residues: with the existing conventional drying methods, the surface of cassava residues is easily gelatinized under high temperature conditions, which in turn produces viscous materials, which leads to drying. can't continue

Through the novelty search, there is no relevant research report on the use of industrial solid waste-cassava residue to produce biomass energy

Images