OCR Text |
Show Fig. 11 illustrates a 600 TPD MSW incineration plant with power generation. Calculation for a "MSW Incineration only" scenario is shown below. Outl ine specification MSW Throughput Heat Value of MSW Steam Pressure (Turbine inlet) Steam Temperature (ditto) Condenser Pressure Total Stoichiometric Ratio Exhaust Gas Treatment(Dry + Wet) Exit Temperature Re-Heater Exit Temperature Catalytic NOx removal Unit Exit Temperature Exhaust Gas Volume (Wet) NOx content 600 TPD 3,000 Kcal/Kg 25 ata 295°C 0.25 ata 1. 75 55°C 210°C 200°C 172.190 Nm 3/h 50 ppm Based on the above, power generation output wi I I be 13, 520KW, with overal I thermal efficiency of 15.5%. NOx 50ppm '--T---------, O2 I 9% I . I NOx 1120ppm I I I I I I I Gas Cleaning Equipment I 26ata I L_, I I I 295ep OC I 13, 520KW Steam G Turbine I I I I I ~ _______ J Condenser ~ : L _ -..9·15a ta-.J Figure 11 FLOW DESIGN FOR MUNICIPAL SOLID WASTE FIRED POWER PLANT 3.2 NATURAL GAS REBURNING POWER GENERATION Stack Natural gas reburning system lowers the total air excess ratio, which improves boi ler heat efficiency and increases power generation. As MSW incineration plants are rated by the MSW throughput tonnage, we calculated the performance of the plant with 15% natural gas input whi Ie the MSW throughput was kept the same as the basel ine case as described earl ier. Steam condition at turbine inlet and condenser pressure also remained the same, whi Ie catalytic NOx removal equipment was deleted. 1 1 |