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B. Kareem et al. Table 2. Material selection for the turbine components and fabrication method. Components Rotor Stator Shaft Structure Inlet nozzle Exist nozzle Material used and fabrication method Material used Austenitic stainless steel Austenitic stainless steel Mild steel Insulated stainless steel Stainless steel Stainless steel Fabrication method Welding Welding Machining Welding Welding/machining Welding/marching Table 3. Bill of engineering material and evaluation for the turbine. Part description Shaft Spur gear Stainless plate Reduction gear Mini power house Cost of production (Naira, N, Nigerian currency) Cost (N) 45,000 15,000 70,000 45,000 310,000 Part description Rotor Bearings Others Total cost Grand total cost Cost (N) 30,000 25,000 50,000 280,000 590,000 3. Results and Discussion In this microturbine design using Solidworks and Comsol Multiphysics analyti- cal software, the results obtained mainly covered the blade, shaft and nozzle de- sign. In blade design parameters, stress failures, efficiency and inlet/outlet angle were considered and the outcome is illustrated in Figure 8. In casing volume de- sign, the overall heat transfer in the volume and mean temperature different concepts were analyzed and the results are given in Figure 5 and Figure 6. Fig- ure 7 gives the outcome of the stress analysis of the blade in withstanding the forces. The outcome interface of thermally induced stress on the turbine stator blade is presented in Figure 5. The thermal stress on the analyzed stator shows that the heat distribution in the stator, represented by colour gradients indicated red as the highest thermal stress temperature of 6.018e+002 K under COMSOL Multiphysics analysis (Figure 5). This shows that the stator cannot be majorly affected by heat or overheated in the turbining process when operated within the temperature 5.231e+002 K and 6.018e+002 K (Figure 6). The result of the thermal analysis carried out on the stator shows that the stator cannot be affected by heat, stress and strain during torsion/compression process (Figure 7) with a strain tolerance ranging from 1.46008e-012 to 1.86427e-008. The stress/heat analysis outcome on the turbine rotor and blades indicated allowable heat load/temperature of 250 ̊C with max- imum heat flux of 200 W/m2 (Figure 8). Heat load beyond the stated allowances open the design to imminent failure. The modified flow conditions adopted has DOI: 10.4236/jpee.2018.611009 118 Journal of Power and Energy EngineeringPDF Image | Design of Steam Turbine for Electric Power Production Using Heat Energy from Palm Kernel Shell
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