Abstract
The object of research is an improved flexible film resistive electric heater of emitting type (FFREHET) for creating a non-reflector IR dryer and vegetable raw material on the example of Antonovka apples. It is proposed to improve the FFREHET by spraying a resistive element based on current-conducting nichrome paste on a flexible electrical insulating film with additional coating on top and bottom by layers of a flexible electrical insulating film. Also, FFREHET is provided with drainages for connection to the power grid. The spectral-optical properties of the Antonovka apple are determined, namely the acceptable IR regions of its absorbing capacity (2.5...3, 6, 9 and 12...15 μm). This confirms the effectiveness of using FFREHET during the drying of plant raw materials. It is confirmed the low inertia of the FFREHET at a temperature of 60 oC with the heating duration τ / = 87 s, which simultaneously corresponds to the constant uniform temperature of the working surface and is characterized by a clear dynamics of operation. Non-reflector VC IR dryer with a vibrating mechanism and a heat exchanger is developed. Improved FFREHET follows the geometric shape of the working chamber of the device, ensuring a reduction in the geometric dimensions and simplicity of device design. According to experimentally obtained kinetics of moisture content for Antonovka apples, the shortest duration of heat treatment is 160 s -1 with conservation of BAS and natural color.
Highlights
One of the ways of processing plant raw materials in dried semi-finished products is the use of IR technolo gy [1,2,3]
Improved FFREHET (Fig. 2) consists of a flexible electrically insulating film 1, on the surface of which is applied to the resistive element through the conductive nichrome paste in the form of series connected rectangular taps 3, which are disposed perpendicularly to the busbars 4 provided by drainages 5 for connection to the electrical network and further covered the top and bottom layers of flexible insulating film 2 and 6
SWOT-analysis of research results allows to determine the main areas of activity for the successful implementation of the aim, namely the development of modern refractory IR dryers based on the improved FFREHET
Summary
One of the ways of processing plant raw materials in dried semi-finished products is the use of IR technolo gy [1,2,3]. IR dryers, which are used today [4], equipped with inertial IR emitters with high temperatures of working surfaces and fixed geometric dimensions and reflector blocks. This increases their metal consumption and does not always ensure a uniform heat flow on the receiving surfaces, which leads to losses of its biologically active substan ces (BAS) and a change in the color of the dried semifinished product. It is actual to study ways to improve the process of IR drying of semi-finished products from plant raw materials and its instrumental design
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