Biogas residue machine-made charcoal and preparation method thereof

Abstract

The invention provides biogas residue machine-made charcoal and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out dry-wet separation on biogas residue and biogas slurry; (2) flatly paving for natural air drying; (3) crushing wood processing residues, so as to obtain crushed wood flour; (4) uniformly stirring the air-dried biogas residue with the wood flour, so as to obtain a mixed material; (5) drying the mixed material; (6) carrying out extrusion forming on the dried mixed material, so as to obtain a formed bar-shaped porous material; and (7)carbonizing the bar-shaped porous material, and naturally cooling under an anoxic condition, so as to obtain the machine-made charcoal. By effectively utilizing biogas residue, the formation pressurerequired for realizing a relax density standard of the machine-made charcoal is reduced, the formation energy consumption is reduced, the equipment loss is reduced, meanwhile, the carbonization temperature is low, the carbonization time is long, the production cost is low, the produced machine-made charcoal is good in property, and the combustion is stable.

Description

technical field [0001] The invention relates to the technical field of machine-made charcoal, in particular to biogas residue machine-made charcoal and a preparation method thereof. Background technique [0002] With the continuous development of comprehensive utilization of straw, anaerobic fermentation has gradually become an environmentally friendly and efficient utilization method. In the process of straw anaerobic fermentation, the treatment of biogas slurry and residue is a very important issue. Biogas residue contains various nutrients and humic acid necessary for plant growth, and is a good raw material for organic fertilizer production. However, the acceptance of organic fertilizers by farmers is not high. "Heavy chemical fertilizers and light organic fertilizers" is one of the current problems in China's agricultural production. Biogas residue organic fertilizers are an important part of the company's revenue. At the same time, the investment in organic fertilizer...

AI Technical Summary

Problems solved by technology

Straw materials contain a large amount of cellulose and a certain amount of minerals. Among them, the building block molecules of cellulose contain more hydroxyl groups. The carbon atoms in each molecule can only combine with water molecules through the hydrogen atoms that form hydrogen bonds provided by the hydroxyl groups, which not only causes During the heating process, it takes a long time for drying, dehydration, and bonding, and the high elasticity is difficult to be compressed, resulting in loose carbon rods, more scattered charcoal, low molding rate, low calorific value, short burning time, moisture, The volatile matter and ash content are also relatively large, thereby reducing the product grade