Improving the technology of sorting wood chips obtained from stump and substandard wood by resin content

The paper considers the issues of the most complete use of wood biomass through the widespread use of a secondary type of raw material - stumps and substandard wood, which under current conditions of logging is 15-25 % of the total volume of harvested wood. The issues of sorting technological wood chips obtained from stumps and substandard wood in an electrostatic field by resin content. Existing methods for sorting technological wood chips by resin content. A new method of sorting technological wood chips for low and high resin in a constant high voltage electrostatic field has been proposed, which can be recommended for industrial implementation. A mathematical model of the deviation of technological wood chips in an electrostatic field depending on the distance between the electrodes and the voltage between them has been obtained. The amount of deviation of the technological wood chips is directly proportional to the amount of voltage generated between the electrodes of the electrostatic separator and inversely proportional to the weight of the wood chips and the distance between the electrodes. The optimal straightened sinusoidal voltage for the separation of wood chips into high resin and low resin has been determined. An experimental setup has been developed and experimental results are presented. The main modes of operation of the plant for sorting process wood chips in an electrostatic field are determined. The dependences of the effect of tar and moisture of technological wood chips on its deviation in a constant electrostatic field with a free fall are obtained. With an increase in resin content, an increase in the deviation of wood chips in an electrostatic field occurs. It has been established that the moisture content of process wood chips in the range from 7 % to 22 % significantly affects the chip deviation, and in this range it is possible to sort technological wood chips using constant voltage to high and low resin. Technological schemes for sorting wood chips obtained from stump and substandard wood at the enterprises of the wood chemical industry are proposed. The main conclusions and recommendations are made; the main dependencies are given.