Development of Microwave Installation for Heat Treatment of Pipes Made of Polymer Composite Materials

The results of theoretical and experimental research in the field of uniform heating of products in the form of tubes made of polymer composite materials, external radius of 30 mm and internal radius of 20 mm by means of microwave radiation at the frequency of electromagnetic field oscillation (EMF) of 2450 MHz are presented. Microwave technologies are energy-saving and environmentally friendly, which reflects the relevance of the work. The design of mi-crowave installation for uniform heating of a pipe from polymer composite material to the tem-perature of +180ºС is offered. In the microwave installation the main elements are two sections of electrodynamic systems. In the first section the round waveguide is used as a heating element, with the main type of wave E01, and in the second section the main element is a diaphragmed round waveguide. The polymer composite tube passes in series through the microwave installation sections between two low dielectric insulating material tubes. In the round waveguide, the treated material of the pipe is heated from the inside to the outside (the inside has the maximum temperature, spa-down to the outside), and in the dia-phragm waveguide has the opposite effect - from the outside to the inside. The impact of two sections of the microwave system creates a superposition of temperature distribution in the pro-cessed material, which should meet the conditions of the technological process. The temperature difference between the calculated and measured values in a plastic com-posite tube must not exceed 3 % and the temperature difference between the measured and measured values of the material temperature must not exceed 7 %.