Avaliação experimental da utilização de misturas de gás pobre com gás natural em microturbina a gás

Abstract

The objective of this research was to study the thermal performance and the emissions of a 30 kW gas microturbine using natural gas (GN) gas mixtures. In a first step, the poor gas from the biomass gasification (rice hull) is obtained experimentally using the air gasification agent. Once produced, the lean gas is mixed with natural gas and tested experimentally in a gas microturbine of 30 kW. The tests focused on thermal performance and included efficiency, rotation, temperatures, fuel gas consumption, airflow, as well as NOx and CO emissions. The results of the microturbine experimental tests, using the poor gas mixed with 50% natural gas, showed that the efficiency decreases about 13% compared to natural gas. The emission results indicate that for the power above 20 kW, the emission of NOx is almost the same for the mixture of 50% of poor gas and 50% of natural gas, compared to natural gas; while the emission of carbon monoxide (CO) at a power of 20 kW, with a mixture of 50% poor gas and 50% natural gas, has an increase of around 40% compared to the experimental test with natural gas. In a second step, experimental tests are performed with a gas microturbine burner of 30 kW with the poor gas (A) and (B). The flame obtained by the lean gas burner (A) and (B) are analyzed by OH-chemiluminescence and laser-induced flat fluorescence (OH PLIF) techniques. These techniques are used to interpret the size and intensity of the flame.