Abstract:
The objective of this thesis was to study the possibility of electrical generation system by a low
pressure steam turbine. The systems consist of fire tube steam boiler of maximum capacity
190 kg/hr at 2.0 barg of steam pressure using LPG fuel, and steam turbine with DC generator.
The study methods to designing a steam turbine based on the initial pressure about 1.0 barg, supper
heat steam temperature at 200 C and steam leaving from the turbine at 0.1 barg of pressure.
The diameter of turbine at 0.15 m and 0.022 m of blade length. The speeds at the turbine are
600 RPM. The investigation of system performance are various super heat steam temperature, steam
pressure, steam flow rate, mass flow rate of LPG, RPM and total system efficiency. The results
shown that the boiler efficiency at 0.6, 0.8 and 1.0 barg of steam pressure, The super heat steam
temperature of 160, 180 and 200 C, and 0.0036, 0.0073m of nozzle diameter. The total system
efficiency when using of 0.0073 m of nozzle diameter, 1.0 barg of steam pressure, 200 C of
super heat steam temperature, 20.54 kg/hr of steam flow rate, 1.26 kg/hr of fuel consumption and
maximum electrical generator of 1.2 kg/hr about 68.41 percent. The economics optimization of the
system at 8 hr/day of steam turbine operation was a payback period of 6.52 years, 12 hr/day of
steam turbine operation was a payback period of 5.66 years and 24 hr/day of steam turbine
operation was a payback period of 4.58 years.