T.M. Khalina, M.V. Khalin, A.B. Dorosh
I.I. Polzunov Altai State Technical University, prosp. Lenina, 46, Barnaul, 656038, Russian Federation
Abstract. The article presents the results of the research of the influence of the particularities of the electric field structure in the quasihomogeneous ambient of the multi-electrode compositional electric heaters (MCEH) of various forms and dimension-types, as well as parameters of a structure-oriented model of distribution of technical carbon in butyl-rubber matrix on the electrophysical characteristics of MCEH and self-regulation regime of its work. The research work was carried out for designing of nanostructural MCEHs with required properties providing power-efficient technologies of heating under conditions of agricultural production. It was proposed a strict solution for the task of determination of electric conductivity for the systems of a laminar type with two couples of electrodes and three-electrode cylindrical systems depending on their constructional parameters, including the length and width of the electroconductive layer, the width of electrodes and the distance between them in a group, correlation of internal and external radiuses of the electroconductive layer. There were obtained analytic dependences and given the results of the calculation of an array of the numeric value of electric conductivity for the most common dimensions of electric heaters, which can be employed for designing of multi-electrode systems. To realize the self-regulation, a nanostructural MCEH should have a negative temperature coefficient in the diapason of values |αρ| ≤ 2-3 % 0C-1, which provides the formation of electroconductive compositional material with the following correlation of the main functional ingredients: butyl-rubber – 59-60 mass percents, technical carbon (TC) N 330 – 19.5-21.1 mass percents. The choice of the suitable mark of TC was determined according to the results of the microscopic research work with the consideration of the grade of the regularity of the cell-reticulate structure of its distribution in the butyl-rubber matrix. The use of nanostructural MCEHs for floor heating of young animals allowed to reduce the energy-material costs by 20-35 %, for conveyor heating of grain material – by 20-40 %, for heating of electric carriers in containers – by 50-60 % compared with traditional technical means.
Keywords: nanostructural multi-electrode composition electric heaters, self-regulation, electrical conductivity, specific electrical conduction.
Author Details: T.M. Khalina, D. Sc. (Tech.), head of departament (e-mail: Этот адрес электронной почты защищён от спам-ботов. У вас должен быть включен JavaScript для просмотра.); M.V. Khalin, D. Sc. (Tech.), prof.; A.B. Dorosh, assist.
For citation: Khalina T.M., Khalin M.V., Dorosh A.B. Power-Efficient Technologies and Technical Means of Local Heating for the Agro-Industrial Complex. Dostizheniya nauki i tekhniki APK. 2017. Vol. 31. No. 3. Pp. 65-71 (in Russ.).