HEAVY FUELS VISCOSITY ADJUSTING SYSTEM MODELING
Abstract
The article briefly considers the peculiarities of viscosity control systems on heavy fuel dynamic model of the tubular steam heat exchanger in the sub-systems of the main marine internal combustion engine. In the analysis of the problem becomes apparent that the characteristics of the fuel delivered to ships and the characteristics specified in the certificate for it are different, thus automatic operation of the fuel preparation system becomes impossible. On this basis, a number of contemporary scholars are engaged in the studying of heat transfer processes in heavy fuel viscosity control systems. Their scientific works
presented in [5, 7, 9]. In the main part of the paper an analysis of the dynamic properties of tubular steam heat exchangers is presented, as well as the derived transfer function of such heat exchanger. For simulation of the fuel heating system in MatLab, the steam tube heat exchanger Alfa Laval manufacturer was taken as a basis. Simulation results show that if in a closed system steady oscillations occur at the interface resistance, they will be the same frequency at the output of any unit of the system. For the experimental determination of the critical values of coefficients gain and the boundary of the oscillation period to conduct several measurements is sufficient. During the experiment, in a mode of continuous wave was recorded:KR kp = 12,5 and Tпп = 4 min. Thus obtained optimal controller settings was detected.
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