Abstract
The object of research is the temperature field of the working surface of the rotor-film apparatus (RFA) when heated by a nichrome spiral with a different coolant layer or using a flexible film resistive radiating type electric heater (FFREHRT). Since the concentration of vegetable purees using RFA is a promising solution, due to a significant reduction in processing time and high quality of the resulting products. Today, most RFAs use electric heating of nichromes with spirals with intermediate coolants, to process a uniform heat flow, which is determined empirically for the thickness of the coolant layer depending on the flow of raw materials, it is processed. Such methods make it possible to obtain qualitative indicators of the uniformity of the temperature field, but the problem is an increase in the metal consumption of the apparatus due to the presence of pumps for the movement of coolants, which generally complicates the operating conditions. Therefore, it is important to improve the RFA heating system using FFREHRT, which is also a thermally insulated surface with a uniform distribution of the temperature field over the entire radiation plane. In the course of the study, the uniformity of the temperature distribution in the RFA model sample is determined for various heating methods (nichrome wire with an intermediate coolant, PFMS-4 organosilicon liquid or FFREHRT). The obtained comparison of heat removal methods made it possible to establish that heating with a nichrome spiral is optimal when the thickness of the coolant layer is 4 mm with a temperature difference of 1.2...2.4 °C . Under conditions of using FFREHRT, a temperature difference of 0.5...0.7 °C. This confirms the prospects of using FFREHRT in the RFA heating system in the conditions of a change in the feed rate of 0.5...1.5•10 3 kg/s. Thanks to the use of FFREHRT for RFA heating, operational conditions will be improved by simplifying the structural properties, reducing resource costs compared to heating with a heating shell with a coolant and the optimal temperature difference on the working surface of the apparatus.
Highlights
One of the main operations in the production of vege table semi-finished products is the concentration of mashed potatoes according to the technological requirements for the required dry matter content [1, 2]
As well as the possibility of their direct location in lines near the places of collection of raw materials [6]. This will ensure a decrease in transportation costs, as well as preservation of the initial properties of the raw materials, which largely depend on the operating parameters of the temperature and uniformity of heating of the raw materials, necessitating the search for innovative solutions to improve the heating methods of rotor-film apparatu ses (RFA)
Most RFAs use electric heating of nichromes with spirals with intermediate coolants to ensure uniform heat flow, which is determined empirically for the thickness of the coolant layer depending on the flow rate of the processed raw materials [7]
Summary
One of the main operations in the production of vege table semi-finished products is the concentration of mashed potatoes according to the technological requirements for the required dry matter content [1, 2]. As well as the possibility of their direct location in lines near the places of collection of raw materials [6] This will ensure a decrease in transportation costs, as well as preservation of the initial properties of the raw materials, which largely depend on the operating parameters of the temperature and uniformity of heating of the raw materials, necessitating the search for innovative solutions to improve the heating methods of RFA. Most RFAs use electric heating of nichromes with spirals with intermediate coolants to ensure uniform heat flow, which is determined empirically for the thickness of the coolant layer depending on the flow rate of the processed raw materials [7] Such methods make it possible to obtain qualitative indicators of the uniformity of the temperature field, but are characterized by increased metal consumption of the apparatus, the presence of pumps for the movement of coolants, in general, lead to a complication of operating conditions [8]. The aim of research is establishing the optimal temperature distribution in RFA under conditions of comparisons of the indicated methods of heat reduction depending on the consumption of raw materials
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