Performance characteristic of single stage micro gas turbine (mgt) running on liquid biofuels
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Date
2018-05
Authors
Poo, Chee Shen
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Abstract
Biofuels are the future interest on renewable green fuels, especially in rural
areas which the difficulties in diesel transportation for the running of the diesel
generator set. Nevertheless, there are plenty of biomass which can be make use of, to
replace diesel in rural areas. The liquid biofuel micro gas turbine can solve the problem
of the diesel high price issue and combined heat power problem in diesel generator set.
A micro gas turbine is an energy generator which is developed from gas turbine
combustion system. In addition, micro gas turbine running on liquid biofuels is getting
attraction globally due to the environmentally friendly and the ability to recirculate the
wasted biomass.
The performance of the micro gas turbine running with biofuels have to be
evaluate and study to further develop the system. In this project, the performance of the
micro gas turbine is characterised with diesel combustion which acts as the benchmark
to the system. The biofuels used in the project is the blending of diesel and vegetable
oil in certain ratio, for example, B10 means 10 percent of vegetable oil and 90 percent
of diesel. The most optimum blending ratio is found out and compare with the diesel.
The main focus is on the power output, specific fuel consumption and emission of
carbon monoxide (CO) and nitrogen oxide (NOx).
In this project, the highest turbine power is 10.365 kW for micro gas turbine
running on diesel and the lowest specific fuel consumption for micro gas turbine
running on diesel is 0.1215 kg/kWh. The result indicate that the biofuel can produce
almost similar turbine power as the diesel, however, with the sacrifice of the specific
fuel consumption performance. Furthermore, the biofuels have much higher CO
emission and NOx emission compare to diesel, in the meanwhile, the CO emission
decrease with higher temperature and higher equivalence ratio, contrarily, NOx
emission increase with higher temperature and higher equivalence ratio. The most
optimum biofuel is B80 which has a lower CO emission and NOx emission at higher
temperature.