DEVELOPMENT OF ACTIVATED CARBON PRODUCTION TECHNOLOGY FROM A FLAX STALKS BY A THERMOLYSIS-IMPULSE METHOD

Purpose of the study is to develop a technology and research and industrial plant for the production of activated carbon by thermolysis-impulse method from a non-traditional source of raw materials – flax stalks. Research methods. Analysis of the chemical composition of flax fire, as well as the current level of its use; disclosure of the activation process and study of the porous structure of sorbents; selection of the optimal method and modes of activation of carbonaceous materials; consideration of methods of activation and study of the mechanism of this reaction; analysis of modern equipment, design and selection of equipment that is most effective in the conditions of flax plants of Ukraine; determination of energy balance of pulse installation; construction of a mathematical model of the process; drawing up a program for computer determination of regression coefficients and on the basis of performed calculations development of nomograms for graphical determination of technological process parameters; study of the influence of technological factors on the physico-chemical characteristics of the obtained activated carbon using the proposed technology and pulse installation that implements it. The results of the study. As a result of research: - developed technology and research and industrial installation for the production of activated carbon by thermolysis-impulse method from a non-traditional source of raw materials - flax stalks; - the optimal technological modes of the activation process are proposed; - the mathematical model of process is created and the nomograms for definition and the forecast of final characteristics of sorbents on input parameters of a technological mode are developed. The expected economic effect for the first year of introduction of the thermolysis-impulse type installation for processing flax stalks into sorbents reaches UAH 2030765. (in 2020 prices). The payback period of the implemented installation is 2.5 months. Conclusions. Using the research results, developed technology and research and industrial installation, it is possible to activate charcoal from flax stalks by thermolysis-impulse method and select the optimal process parameters within the specified temperature and time limits. The obtained activated carbon is applicable for absorption of relatively large molecules or microsuspensions from liquid media. On the basis of the researched materials of this work it is expedient to recommend the offered industrial technological scheme of process of thermolysis-impulse processing of a flax stalks in sorbents.

Research of the echo-impulse method of control of drilled pieces (non-destructive control)

The results of field and computational experimental studies of the pulse echo method are presented. Typical reflectograms of bored piles are presented. The factors that complicate the interpretation of control data are noted. An analysis of the formation of the fronts of an acoustic pulse during its shock excitation is presented. Estimates of the influence of reinforcement on the estimates of the propagation velocity of an acoustic pulse are given.