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Investigation of the possibility of increasing heat exchange efficiency in modified trapezium screw pipes profile of fuel oil heater PM-40-15.

Recently, a special direction in solving the problem of intensification of convection heat exchange, which is based on the idea of influencing the micro- and macrostructure of the flow of heat carriers by various swirls in the channels of their movement, has been widely developed in industrial heat engineering. Despite the huge number of publications on this topic, the issue of improving the effectiveness of heat exchangers remains far from its final solution. The research is aimed at studying the possibilities and limits of increasing the efficiency of heat transfer in the modified trapezoidal helical profile of the inner surface of the pipes of the fuel oil heater PM-40-15. To achieve this goal, the method of computer simulation using SolidWorks software was used. In this program, a geometric model of a fuel oil heater was created with both smooth standard pipes and modified pipes with trapezoidal profiles with a height of h = 2, 3 and 4 mm and relative steps of the screw profile S/D = 0.6, 0.8, 1.0, 1.2 and 1.5. The temperature of fuel oil M100 at the inlet of the fuel oil heater was taken to be 60°С, and the temperature of the walls of the pipes washed with superheated steam at a pressure of 1.0 MPa, 200°С. These parameters corresponded to the nominal mode of operation of the fuel oil heater PM-40-15. As a result of the research, it was found that the best efficiency indicators are achieved on pipes with a profile height h = 2 mm and a relative step S/D = 0.8.