Análise de desempenho de um grupo gerador a diesel operando como dual (diesel e gás natural)

Abstract

The present work brings the thermal performance analysis of a Generator Group originally Diesel, operating as Dual (Diesel and natural gas). The study was conducted in an MDG-5000CLE Diesel Generator Set, which was adapted for operation with two fuels, Diesel and Natural Gas. In the study, it was necessary to modify the intake manifold of the engine to allow the admission of air but also of natural gas. This change was possible with the installation of a Dual Fuel kit, consisting of a diffuser, a flow control valve, a stepper motor, and the Arduino gas control system. For the simulation of the loads imposed on the generator, was developed at the Laboratório de Inovação of the UFPB, a resistive load bank with ten resistors of 500 W each connected in parallel. The tests were based on two stages. Initially, the tests with the Generator group were performed using only diesel, and later, in Dual mode. During the tests, the fuel consumption and natural gas consumption values, as well as noise levels and exhaust gas opacity, were recorded for comparison purposes. The tests consisted of the imposition of predetermined loads on the generator in both modes of operation, which corresponded to 1.14; 2.14; 3.25; 4.24; 4.69 kW. With the tests completed and the comparisons made, it was verified that the limit of substitution of Diesel by Natural Gas grows as the power increases, reaching the maximum substitution of 85.10%, in the maximum power, of 4,69 kW . In a similar way, it was observed that the thermal efficiency of the generating set increases with increasing power. There was still little variation in noise levels and opacity of air in relation to power.