Design and Modeling Optimization of Superheated Micro Steam Power Plant

Abstract

A PKS-fired 5-10 kW micro power plant has been designed, modeled and simulated to produce superheated steam for domestic and SMEs consumption. The target is to sustain power output at optimal design parameters. Design, modeling and simulation analyses of plant’s components were carried and then integrated to a unit micro power plant. These analyses were done to enhance the efficiency of whole power plant through reduction of heat losses and optimal sizing of components. Modeling results indicated that running the plants at the lowest possible temperatures (pressures) of 235 oC (0.35 MPa) and 235 oC (0.35 MPa) would be sufficient to enhance safety with acceptable steam mass flow rates (0.00357 kg/s, 0.00178) and steam flow velocities (14.87 m/s, 7.43 m/s). Design results showed that angular mild steel of diameter ranging 5 -10 mm were adequate for the plant stand. Simulation results revealed that the designed parameters (stress, strain, deflection, and thermal resistance) were within the acceptable standards, this portrayed design adequacy. Designed temperature of 0- 400oC was within the acceptable range and far from maximum tolerable material temperature of 1200oC. Heat flux (2.31 W/mm2) obtained from the design was conveniently within the simulated range, which shows that the design is workable. Improvement efficiency of 12% was obtained as compared to past micro plant design; this is a remarkable achievement.