SU1747466A1 - Method of producing granulated peat - Google Patents

Abstract

SUMMARY OF THE INVENTION: The method includes drying the crushed peat and forcing it through cylindrical holes. About 3-7 parts of peat are dried to a moisture of not more than 20%, then it is mixed with the remaining 7-3 parts of milled peat with 45-55% moisture and the mixture is granulated 1 table

Description

This invention relates to methods for producing peat pellets and can be used to obtain pellets from other materials, such as coal and drill coal, lignin, or mixtures thereof.

A known method of producing granulated peat by grinding and drying peat to a moisture content of 20-44 wt.%, And then granulating in granulators with a perforated ring matrix.

However, the implementation of this method requires a large amount of energy for the granulation of dry peat. With this moisture content, the latter is inside the cells that form peat. During granulation, energy is expended on overcoming the forces of internal friction between particles and on overcoming the forces of friction of dry peat on the walls of the matrix (dies). When peat is up to 15%, there is a spraying (goat) of the latter in the matrix dies.

The aim of the invention is to reduce energy consumption and increase the reliability of the method.

This goal is achieved by the fact that about 30-70% of prepared milled peat or a mixture of peat with other components is dried to a moisture content of not more than 20%, then it is mixed with the remaining ms by milling peat humidity 45- / 55%,

The resulting mixture is granulated using known granulators. Wet peat is a plasticizer that reduces friction both between particles and between the surface of the matrix and the material. The ratio between dry and wet peat is chosen so as to provide the necessary moisture content of the mixture (20-44%). By adding a plasticizer, the granulation process is reliable.

It is known that (three manufacturers of granulated feed use water and steam as plasticizers. However, for plastic peat, these plasticizers are not acceptable, since water is repelled from dry peat particles and is not sorbed on their surface.

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This is due to the fact that, due to the presence of humic substances in peat, the drying process is irreversible,

Other plastic biogenic materials can be used as a plasticizer for dry peat, such as brown coal, lignin, etc.

The mixture in this case becomes plastic as a result of reduced friction between peat particles. The friction decreases also between the peat and the surface of the matrix (die). As a result, the energy consumption and the likelihood of jamming (kozleni) matrix are reduced.

Example, for research, prepared milled peat dryer to a moisture content of 45-55%. After drying, three portions of peat were collected and further dried to a moisture content of 10, 15, and 18%. These portions of dry peat were mixed with the rest with peat (humidity 45-55%) in the ratio indicated in the table. The moisture of the prepared mixtures was 20-44%. For comparison (prototype), samples of peat were dried to a moisture content similar to that of the prepared mixtures. Mixtures and samples of dry peat were granulated on a granulator with a perforated ring matrix (granulator OGM-1.5). In the process of granulation, determine the costs of electricity for granulation

The results of the experiments are presented in the table.

Analysis of the research results shows that the proposed method reduces the specific energy consumption for peat pelletization by 20-50% compared to the prototype. In this case, the lower the peat moisture, the greater the effect. No jamming of the matrix is observed - the granulation process increases.

Using the proposed method can significantly reduce energy consumption and improve the reliability of the technical process in the production of pellets from peat and other dispersed materials.

Claims (1)

Invention Formula The method of obtaining granulated peat, which includes drying the crushed peat to a moisture content of 45-55% and pushing it through cylindrical holes, characterized in that, in order to reduce energy consumption and increase the reliability of the method, after drying, 30-70% of peat is also dried to moisture no more than 20%, then it is mixed with the remaining peat, after which it is pressed.